Mexican Petroleum 20-F 17 May 21 2020 FY Annual report (foreign) Financial data

Cover Page

Cover Page	12 Months Ended
	Dec. 31, 2020shares
Cover [Abstract]
Document Type	20-F
Amendment Flag	false
Document Period End Date	Dec. 31, 2020
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
Entity Registrant Name	MEXICAN PETROLEUM
Entity Central Index Key	0000932782
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Filer Category	Non-accelerated Filer
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding	0
Entity Interactive Data Current	Yes
Entity Voluntary Filers	No
Document Registration Statement	false
Document Annual Report	true
Document Transition Report	false
Document Shell Company Report	false
Entity Address, Country	MX
ICFR Auditor Attestation Flag	false

Consolidated Statements of Fina

Consolidated Statements of Financial Position $ in Thousands, $ in Thousands	Dec. 31, 2020USD ($)	Dec. 31, 2020MXN ($)	Dec. 31, 2019MXN ($)
Current assets:
Cash and cash equivalents	$ 2,004,631	$ 39,989,781	$ 60,621,631
Customers	3,427,913	68,382,413	89,263,870
Other financing receivables	1,584,846	31,615,623	31,416,091
Other non-financing receivables	4,501,017	89,789,428	59,825,720
Inventories	2,637,047	52,605,661	82,672,196
Current portion of the Government Bonds	904,147	18,036,557
Current portion of notes receivable			4,909,970
Derivative financial instruments	1,300,736	25,947,993	11,496,330
Other current assets	175,063	3,492,283	2,829,233
Total current assets	16,535,400	329,859,739	343,035,041
Non-current assets:
Investments in joint ventures and associates	602,301	12,015,129	14,874,579
Wells, pipelines, properties, plant and equipment, net	63,970,561	1,276,129,521	1,277,548,562
Rights of use	2,967,374	59,195,257	70,818,314
Long-term notes receivable, net of current portion and other	44,455	886,827	122,565,306
Long-term of the Government Bonds	5,589,986	111,512,962
Deferred income taxes and duties	5,440,415	108,529,199	136,166,747
Intangible assets, net	1,141,718	22,775,784	14,584,524
Other assets	380,151	7,583,510	4,654,007
Total non-current assets	80,136,961	1,598,628,189	1,641,212,039
Total assets	96,672,361	1,928,487,928	1,984,247,080
Current liabilities:
Short-term debt and current portion of long-term debt	19,605,151	391,097,267	244,924,185
Short-term leases	406,389	8,106,937	5,847,085
Suppliers	14,135,159	281,978,041	208,034,407
Income taxes and duties payable	2,566,599	51,200,314	50,692,629
Accounts and accrued expenses payable	1,539,423	30,709,497	26,055,151
Derivative financial instruments	467,099	9,318,015	16,650,171
Total current liabilities	38,719,820	772,410,071	552,203,628
Long-term liabilities:
Long-term debt, net of current portion	93,621,642	1,867,630,050	1,738,249,903
Long-term leases	2,760,941	55,077,191	62,301,542
Employee benefits	76,955,796	1,535,168,086	1,456,815,367
Provisions for sundry creditors	4,743,461	94,625,884	98,011,908
Other liabilities	245,209	4,891,562	4,397,299
Deferred income taxes	171,044	3,412,114	3,676,735
Total long-term liabilities	178,498,093	3,560,804,887	3,363,452,754
Total liabilities	217,217,913	4,333,214,958	3,915,656,382
Controlling interest:
Certificates of Contribution "A"	26,314,068	524,931,447	478,675,447
Mexican Government contributions	2,192,152	43,730,591	43,730,591
Legal reserve	50,235	1,002,130	1,002,130
Accumulated other comprehensive result	(12,596,560)	(251,284,990)	(240,078,590)
Accumulated deficit:
From prior years	(111,014,607)	(2,214,597,087)	(1,933,106,785)
Net loss for the year	(25,509,372)	(508,878,813)	(281,490,302)
Total controlling interest	(120,564,084)	(2,405,096,722)	(1,931,267,509)
Total non-controlling interest	18,532	369,692	(141,793)
Total equity (deficit)	(120,545,552)	(2,404,727,030)	(1,931,409,302)
Commitments and contingencies
Subsequent events	0	0	0
Total liabilities and equity (deficit)	$ 96,672,361	$ 1,928,487,928	$ 1,984,247,080

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)	Dec. 31, 2020MXN ($)	Dec. 31, 2019MXN ($)	Dec. 31, 2018MXN ($)
Net sales
Domestic	$ 25,250,369	$ 503,712,031	$ 807,020,214	$ 980,559,538
Export	22,318,965	445,234,329	585,842,291	691,886,610
Services income	236,381	4,715,484	9,108,680	8,673,002
Total of sales	47,805,715	953,661,844	1,401,971,185	1,681,119,150
(Impairment) reversal of impairment of wells, pipelines, properties, plant and equipment, net	(1,822,359)	(36,353,700)	(31,283,154)	21,418,997
Cost of sales	41,737,792	832,614,690	1,122,933,424	1,199,511,561
Gross income	4,245,564	84,693,454	247,754,607	503,026,586
Other revenues (expenses):
Other revenues	589,956	11,768,846	14,940,447	41,517,631
Other expenses	(59,889)	(1,194,714)	(7,211,691)	(18,465,120)
Distribution, transportation and sale expenses	623,411	12,436,242	21,885,911	24,357,209
Administrative expenses	7,313,481	145,894,444	130,768,822	134,321,481
Operating income	(3,161,261)	(63,063,100)	102,828,630	367,400,407
Financing income	839,255	16,742,048	29,235,603	31,557,122
Financing cost	(8,109,062)	(161,765,242)	(132,861,340)	(123,869,684)
Derivative financial instruments (cost) income, net	857,005	17,096,141	(23,263,923)	(19,115,951)
Foreign exchange (loss) gain, net	(6,464,045)	(128,949,304)	86,930,388	23,659,480
Sum of financing (costs) net, derivative instruments (cost) and foreign exchange gains, net	(12,876,847)	(256,876,357)	(39,959,272)	(87,769,033)
(Loss) profit sharing in joint ventures and associates	(177,482)	(3,540,533)	(1,157,893)	1,527,012
(Loss) income before duties, taxes and other	(16,215,590)	(323,479,990)	61,711,465	281,158,386
Profit sharing duty, net	7,750,336	154,609,136	372,812,500	469,933,595
Income tax expense (benefit), net	1,552,128	30,962,939	(28,989,011)	(8,355,372)
Total duties, taxes and other	9,302,464	185,572,075	343,823,489	461,578,223
Net loss	(25,518,054)	(509,052,065)	(282,112,024)	(180,419,837)
Currency translation effect	394,861	7,876,961	(2,695,532)	846,191
Actuarial (losses) gains - employee benefits, net of taxes	(961,585)	(19,182,373)	(309,327,314)	222,545,556
Total other comprehensive results	(566,724)	(11,305,412)	(312,022,846)	223,391,747
Total comprehensive (loss) income	(26,084,778)	(520,357,477)	(594,134,870)	42,971,910
Net loss attributable to:
Controlling interest	(25,509,372)	(508,878,813)	(281,490,302)	(180,374,350)
Non-controlling interest	(8,682)	(173,252)	(621,722)	(45,487)
Net loss	(25,518,054)	(509,052,065)	(282,112,024)	(180,419,837)
Other comprehensive results attributable to:
Controlling interest	(561,761)	(11,206,400)	(312,025,657)	223,834,249
Non-controlling interest	(4,963)	(99,012)	2,811	(442,502)
Total other comprehensive results	(566,724)	(11,305,412)	(312,022,846)	223,391,747
Comprehensive (loss) income:
Controlling interest	(26,071,133)	(520,085,213)	(593,515,959)	43,459,899
Non-controlling interest	(13,645)	(272,264)	(618,911)	(487,989)
Total comprehensive (loss) income	$ (26,084,778)	$ (520,357,477)	$ (594,134,870)	$ 42,971,910

Consolidated Statements of Chan

Consolidated Statements of Changes in Equity (Deficit) $ in Thousands, $ in Thousands	USD ($)	MXN ($)	Increase in Certificates of Contribution "A" [member]MXN ($)	Adjusted Balance [member]MXN ($)	Cumulative currency translation effect [member]USD ($)	Cumulative currency translation effect [member]MXN ($)	Cumulative currency translation effect [member]Adjusted Balance [member]MXN ($)	Actuarial (losses) gains on employee benefits effect [member]USD ($)	Actuarial (losses) gains on employee benefits effect [member]MXN ($)	Actuarial (losses) gains on employee benefits effect [member]Adjusted Balance [member]MXN ($)	Certificates of Contribution "A" [member]USD ($)	Certificates of Contribution "A" [member]MXN ($)	Certificates of Contribution "A" [member]Increase in Certificates of Contribution "A" [member]MXN ($)	Certificates of Contribution "A" [member]Adjusted Balance [member]MXN ($)	Mexican Government contributions [member]USD ($)	Mexican Government contributions [member]MXN ($)	Mexican Government contributions [member]Adjusted Balance [member]MXN ($)	Legal reserve [member]USD ($)	Legal reserve [member]MXN ($)	Legal reserve [member]Adjusted Balance [member]MXN ($)	Accumulated other comprehensive income (loss) [member]Cumulative currency translation effect [member]MXN ($)	Accumulated other comprehensive income (loss) [member]Actuarial (losses) gains on employee benefits effect [member]MXN ($)	Accumulated deficit [member]USD ($)	Accumulated deficit [member]MXN ($)	Accumulated deficit [member]Adjusted Balance [member]MXN ($)	Equity attributable to owners of parent [member]USD ($)	Equity attributable to owners of parent [member]MXN ($)	Equity attributable to owners of parent [member]Increase in Certificates of Contribution "A" [member]MXN ($)	Equity attributable to owners of parent [member]Adjusted Balance [member]MXN ($)	Non-controlling interests [member]USD ($)	Non-controlling interests [member]MXN ($)	Non-controlling interests [member]Adjusted Balance [member]MXN ($)
Beginning balance (From prior years [member]) at Dec. 31, 2017																								$ (1,752,732,435)
Beginning balance at Dec. 31, 2017		$ (1,502,377,342)										$ 356,544,447				$ 43,730,591			$ 1,002,130		$ 44,633,012	$ (196,520,194)					$ (1,503,342,449)				$ 965,107
Statement [LineItems]
Total comprehensive income (loss)		42,971,910																			1,287,215	222,547,034		(180,374,350)			43,459,899				(487,989)
Ending Balance (From prior years [member]) at Dec. 31, 2018																								(1,752,732,435)
Ending Balance at Dec. 31, 2018		(1,459,405,432)										356,544,447				43,730,591			1,002,130		45,920,227	26,026,840		(180,374,350)			(1,459,882,550)				477,118
Statement [LineItems]
Transfer to accumulated deficit | From prior years [member]																								(180,374,350)
Transfer to accumulated deficit																								180,374,350
Increase in Certificates of Contribution "A"			$ 122,131,000										$ 122,131,000															$ 122,131,000
Total comprehensive income (loss)		(594,134,870)																			(2,691,157)	(309,334,500)		(347,289,362)			(659,315,019)				(618,911)
Ending Balance (From prior years [member]) at Dec. 31, 2019																								(1,933,106,785)	$ (1,933,106,785)
Ending Balance at Dec. 31, 2019		(1,931,409,302)		$ (1,997,208,362)		$ 43,229,070	$ 43,229,070		$ (283,307,660)	$ (283,307,660)		478,675,447		$ 478,675,447		43,730,591	$ 43,730,591		1,002,130	$ 1,002,130				(281,490,302)	$ (347,289,362)		(1,931,267,509)		$ (1,997,066,569)		(141,793)	$ (141,793)
Statement [LineItems]
Non-material adjustment (Notes 4-B and 13-F)		65,799,060																						65,799,060			65,799,060
Transfer to accumulated deficit | From prior years [member]																								(281,490,302)
Transfer to accumulated deficit																								281,490,302
Increase in Certificates of Contribution "A"			$ 46,256,000										$ 46,256,000															$ 46,256,000
Non-controlling divestment		783,749																													783,749
Total comprehensive income (loss)	$ (26,084,778)	(520,357,477)																			7,972,187	(19,178,587)		(508,878,813)			(520,085,213)				(272,264)
Ending Balance (From prior years [member]) at Dec. 31, 2020																							$ (111,014,607)	(2,214,597,087)
Ending Balance at Dec. 31, 2020	$ (120,545,552)	$ (2,404,727,030)			$ 2,566,646			$ (15,163,206)			$ 26,314,068	$ 524,931,447			$ 2,192,152	$ 43,730,591		$ 50,235	$ 1,002,130		$ 51,201,257	$ (302,486,247)	$ (25,509,372)	$ (508,878,813)		$ (120,564,084)	$ (2,405,096,722)			$ 18,532	$ 369,692

Consolidated Statements of Cash

Consolidated Statements of Cash Flows $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)	Dec. 31, 2020MXN ($)	Dec. 31, 2019MXN ($)	Dec. 31, 2018MXN ($)
Operating activities:
Net loss	$ (25,518,054)	$ (509,052,065)	$ (282,112,024)	$ (180,419,837)
Items related to investment activities:
Income taxes and duties	9,302,465	185,572,075	343,823,489	446,612,429
Depreciation and amortization of Wells, pipelines, properties, plant and equipment	6,498,259	129,631,820	137,187,010	153,382,040
Amortization of intangible assets	24,011	478,988	543,372	2,643,326
Impairment (Reversal of impairment) of wells, pipelines, properties, plant and equipment	1,822,359	36,353,700	31,283,154	(21,418,997)
Unsuccessful wells from intangible assets
Exploration costs	421,295	8,404,284	7,990,877	(2,171,218)
Capitalized unsuccessful wells	548,793	10,947,702	71,604,308	15,443,086
Loss from derecognition of disposal of wells, pipelines, properties, plant and equipment	265,559	5,297,562	2,541,558	16,885,264
Loss from derecognition of intangible assets	19,857	396,118
Depreciation of rights of use	362,391	7,229,231	7,429,275
Cancellation of leases	(55,241)	(1,101,987)
Gains on disposal of subsidiary companies	(35,468)	(707,533)		(701,171)
Unrealized foreign exchange (income) loss of reserve for well abandonment	228,370	4,555,692	(258,816)	(6,953,200)
Profit sharing in joint ventures and associates	177,482	3,540,533	1,157,893	(1,527,012)
Items related to financing activities
Unrealized foreign exchange income	6,640,345	132,466,243	(78,244,974)	(19,762,208)
Interest expense	8,109,062	161,765,242	132,861,340	123,869,684
Interest income	(839,255)	(16,742,048)	(29,235,603)	(9,520,962)
Funds from operating activities	7,972,230	159,035,557	346,570,859	516,361,224
Funds used in operating activities
Profit-sharing duty and income tax paid	(8,640,639)	(172,369,522)	(347,515,447)	(443,785,240)
Derivative financial instruments	(1,091,992)	(21,783,819)	11,640,873	5,880,442
Accounts receivable	(1,020,287)	(20,353,395)	(8,534,028)	(3,429,171)
Inventories	852,664	17,009,543	(649,629)	(18,163,638)
Other assets				(530,711)
Accounts payable and accrued expenses	233,316	4,654,346	1,137,483	1,706,268
Suppliers	1,154,464	23,030,055	46,561,282	9,887,334
Provisions for sundry creditors	111,410	2,222,492	(5,787,614)	(5,950,348)
Employee benefits	2,966,125	59,170,346	66,954,701	53,604,884
Other taxes and duties	735,790	14,678,059	(25,157,966)	26,205,546
Net cash flows from operating activities	3,273,081	65,293,662	85,220,514	141,786,590
Investing activities:
Long-term receivables from the Mexican Government				2,364,053
Interest received for long-term receivable from the Mexican Government				187,615
Other receivables			68,863	1,246,763
Resources from the sale of subsidiary companies	6,753	134,716		4,078,344
Other assets	(180,090)	(3,592,553)	(710,867)
Acquisition of wells, pipelines, properties, plant and equipment	(5,763,636)	(114,977,051)	(109,653,693)	(94,003,596)
Interests collected	46,938	936,350	16,217,132
Intangible assets	(1,185,095)	(23,641,105)	(17,220,238)	(14,957,093)
Net cash flows used in investing activities	(7,075,130)	(141,139,643)	(111,298,803)	(101,083,914)
Excess cash to apply in financing activities	(3,802,049)	(75,845,981)	(26,078,289)	40,702,676
Financing activities:
Increase in equity due to Certificates of Contribution "A"	2,318,748	46,256,000	122,131,000
Long-term receivables from the Mexican Government	205,659	4,102,622	32,493,666
Interest received for long-term receivable from the Mexican Government	85,134	1,698,318	6,211,217
Lease payments	(400,025)	(7,979,972)	(10,709,421)
Interest of lease paid	(101,803)	(2,030,829)	0
Loans obtained from financial institutions	64,572,121	1,288,129,868	1,167,834,946	899,769,012
Debt payments, principal only	(57,746,226)	(1,151,962,147)	(1,185,042,283)	(841,033,392)
Interest paid	(6,566,300)	(130,989,150)	(127,945,203)	(115,289,389)
Net cash flows from (used in) financing activities	2,367,308	47,224,710	4,973,922	(56,553,769)
Net decrease in cash and cash equivalents	(1,434,741)	(28,621,271)	(21,104,367)	(15,851,093)
Effects of foreign exchange on cash balances	400,496	7,989,421	(186,411)	(88,252)
Cash and cash equivalents at the beginning of the period	3,038,876	60,621,631	81,912,409	97,851,754
Cash and cash equivalents at the end of the period	$ 2,004,631	$ 39,989,781	$ 60,621,631	$ 81,912,409

Structure and Business Operatio

Structure and Business Operations of Petroleos Mexicanos, Subsidiary Entities and Subsidiary Companies	12 Months Ended
	Dec. 31, 2020
Text block [abstract]
Structure and Business Operations of Petroleos Mexicanos, Subsidiary Entities and Subsidiary Companies	NOTE 1. STRUCTURE AND BUSINESS OPERATIONS OF PETRÓLEOS MEXICANOS, SUBSIDIARY ENTITIES AND SUBSIDIARY COMPANIES Petróleos Mexicanos was created by a decree issued by the Mexican Congress on June 7, 1938. The decree was published in the Diario Oficial de la Federación (“Official Gazette of the Federation”) on July 20, 1938 and came into effect on that date. On December 20, 2013, the Decreto por el que se reforman y adicionan diversas disposiciones de la Constitución Política de los Estados Unidos Mexicanos, en Materia de Energía On August 11, 2014, the Ley de Petróleos Mexicanos Disposiciones Generales de Contratación para Petróleos Mexicanos y sus Empresas Productivas Subsidiarias Once the Petróleos Mexicanos Law came into effect, Petróleos Mexicanos was transformed from a decentralized public entity to a productive state-owned company. Petróleos Mexicanos is a legal entity empowered to own property and carry on business in its own name with the purpose of carrying out exploration and extraction of crude oil and other hydrocarbons in the United Mexican States (“Mexico”), as well as refining, processing, storing, transporting, selling and trading in these products. The Subsidiary Entities, Pemex Exploración y Producción Pemex Transformación Pemex Logística Pemex Fertilizantes As of December 31, 2020, the Subsidiary Entities and their primary purposes, are as follows: • Pemex Exploration and Production: This entity is in charge of exploration and extraction of crude oil and solid, liquid or gaseous hydrocarbons in Mexico, in the exclusive economic zone of Mexico and abroad, as well as drilling services and repair and services of wells; • Pemex Industrial Transformation: This entity performs activities related to refining, processing, importing, exporting, trading and the sale of hydrocarbons, as well as commercializes, distributes and trades methane, ethane and propylene, directly or through others; • Pemex Logistics: This entity provides transportation, storage and related services for crude oil, petroleum products and petrochemicals to PEMEX (as defined below) and other companies, through pipelines and maritime and terrestrial means, and provides guard and management services; and • Pemex Fertilizers: This entity produces, distributes and commercializes ammonia, fertilizers and its derivatives, as well as provides related services. (see Note 28 “Subsequent events” in connection with the Declaratoria de Extinción de la Empresa Productiva del Estado Subsidiaria de Petróleos Mexicanos, denominada Pemex Fertilizantes The principal distinction between the Subsidiary Entities and the Subsidiary Companies (as defined below) is that the Subsidiary Entities are productive state-owned entities, whereas the Subsidiary Companies are affiliate companies that were formed in accordance with the applicable laws of each of the respective jurisdictions in which they were incorporated. The “Subsidiary Companies” are defined as those companies which are controlled, directly or indirectly, by Petróleos Mexicanos. “Associates,” as used herein, means those companies in which Petróleos Mexicanos has significant influence but not control or joint control over its financial and operating policies. Petróleos Mexicanos, the Subsidiary Entities and the Subsidiary Companies are referred to collectively herein as “PEMEX”. PEMEX’s address and its principal place of business is: Av. Marina Nacional No. 329, Col. Verónica Anzures, Alcaldía Miguel Hidalgo, 11300, Ciudad de México, México.

Authorization and Basis of Prep

Authorization and Basis of Preparation	12 Months Ended
	Dec. 31, 2020
Text block [abstract]
Authorization and Basis of Preparation	NOTE 2. AUTHORIZATION AND BASIS OF PREPARATION Authorization – On May 14, 2021, these consolidated financial statements and the notes hereto were authorized for issuance by the following officers: Mr. Octavio Romero Oropeza, Chief Executive Officer, Mr. Alberto Velázquez García, Chief Financial Officer, Mr. Carlos Fernando Cortez González, Deputy Director of Budgeting and Accounting, and Mr. Oscar René Orozco Piliado, Associate Managing Director of Accounting. These consolidated financial statements and the notes hereto are issued pursuant to the terms of Article 13 Fraction VI of the Petróleos Mexicanos Law, Article 104 Fraction III, paragraph a, of the Ley del Mercado de Valores Disposiciones de carácter general aplicables a las emisoras de valores y a otros participantes del mercado de valores Basis of preparation – A. Statement of compliance PEMEX prepared its consolidated financial statements as of December 31, 2020 and 2019, and for the years ended December 31, 2020, 2019 and 2018, in accordance with International Financial Reporting Standards (“IFRS”) as issued by the International Accounting Standards Board (“IASB”). B. Basis of accounting These consolidated financial statements have been prepared using the historical cost basis method, with the exception of the following items, which have been measured using an alternative basis. ITEM BASIS OF MEASUREMENT Derivative Financial Instruments (“DFIs”) Fair Value Employee Benefits Fair Value of plan assets less present value of the obligation (defined benefit plan) C. Going concern The consolidated financial statements have been prepared on a going concern basis, which assumes that PEMEX will be able to continue its operations and can meet its payment obligations for a reasonable period. (See Note 22-F). D. Functional and reporting currency These consolidated financial statements are presented in Mexican pesos, which is both PEMEX’s functional currency and reporting currency, due to the following: i. The economic environment in which PEMEX operates is Mexico, where the legal currency is the Mexican peso; ii. The budget through which Petróleos Mexicanos and its Subsidiary Entities operate as entities of the Mexican Government, including the ceiling for personnel services, is elaborated, approved and exercised in Mexican pesos. iii. Employee benefits provision was approximately 35% and 37% of PEMEX’s total liabilities as of December 31, 2020 and 2019, respectively. This provision is computed, denominated and payable in Mexican pesos; and iv. Cash flows for payment of general expenses, taxes and duties are realized in Mexican pesos. Although the sales prices of certain products are based on international U.S. dollar-indices, final domestic selling prices are governed by the economic and financial policies established by the Mexican Government. Accordingly, cash flows from domestic sales are generated and received in Mexican pesos. Mexico’s monetary policy regulator, the Banco de México (“Mexican Central Bank”), requires that Mexican Government entities other than financial entities sell their foreign currency to the Mexican Central Bank in accordance with its terms, receiving Mexican pesos in exchange, which is the currency of legal tender in Mexico. Terms definition – References in these consolidated financial statements and the related notes to “pesos” or “Ps.” refers to Mexican pesos, “U.S. dollars” or “U.S. $” refers to dollars of the United States of America, “yen” or “¥” refers to Japanese yen, “euro” or “€” refers to the legal currency of the European Economic and Monetary Union, “pounds sterling” or “£” refers to the legal currency of the United Kingdom and “Swiss francs” or “CHF” refers to the legal currency of the Swiss Confederation. Figures in all currencies are presented in thousands of the relevant currency unit, except exchange rates and product and share prices. E. Use of judgments and estimates The preparation of the consolidated financial statements in accordance with IFRS requires the use of estimates and assumptions made by PEMEX’s management that affect the recorded amounts of assets and liabilities and the disclosures of contingent assets and liabilities as of the date of these consolidated financial statements, as well as the recorded amounts of income, costs and expenses during the year. Actual results may differ from these estimates. Significant estimates and underlying assumptions are reviewed, and the effects of such revisions are recognized in the years in which any estimates are revised and in any future periods affected by such revision. Information about estimates, assumptions and critical accounting policies that have the most significant effects on the amounts recognized in the consolidated financial statements are described in the following notes: i. Judgments, assumptions and estimation uncertainties • Note 3-C • Note 3-E • Note 3-F • Note 3-H non-financial • Note 3-I • Note 3-J • Note 3-K • Note 3-L s • Note 3-M ii. Measurement of fair values Some of PEMEX’ s accounting policies and disclosures require the measurement of the fair values of financial assets and liabilities, as well as non-financial PEMEX has an established control framework with respect to the measurement of fair values. This includes a valuation team that has overall responsibility for overseeing all significant fair value measurements, including Level 3 fair values. The valuation team regularly reviews significant unobservable inputs and valuation adjustments. If third party information, such as broker quotes or pricing services, is used to measure fair values, then the valuation team assesses the evidence obtained from the third parties to support the conclusion that these valuations meet the requirements of IFRS, including the level in the fair value hierarchy in which the valuations should be classified. When measuring the fair value of an asset or a liability, PEMEX uses market observable data as far as possible. Fair values are categorized into different levels in a fair value hierarchy based on the inputs used in the valuation techniques as follows. • Level 1: quoted prices (unadjusted) in active markets for identical assets or liabilities. • Level 2: inputs other than quoted prices included in Level 1 that are observable for the asset or liability, either directly (i.e. as prices) or indirectly (i.e. derived from prices). • Level 3: inputs for the asset or liability that are not based on observable market data (unobservable inputs). If the inputs used to measure the fair value of an asset or a liability might be categorized in different levels of the fair value hierarchy, then the fair value measurement is categorized in its entirety in the same level of the fair value hierarchy as the lowest level input that is significant to the entire measurement. PEMEX recognizes transfers between levels of the fair value hierarchy at the end of the reporting period during which the change has occurred. F. Convenience translations These consolidated financial statements are presented in Mexican pesos (reporting currency), which is the same as the recording currency and the functional currency of PEMEX. The U.S. dollar amounts shown in the consolidated statements of financial position, the consolidated statements of comprehensive income, the consolidated statements of changes in equity (deficit) and the consolidated statements of cash flows have been included solely for the convenience of the reader and are unaudited. Such amounts have been translated from amounts in pesos, as a matter of arithmetic computation only, at the exchange rate for the settlement of obligations in foreign currencies provided by the Mexican Central Bank and the Secretaría de Hacienda y Crédito Público

Significant Accounting Policies

Significant Accounting Policies	12 Months Ended
	Dec. 31, 2020
Text block [abstract]
Significant Accounting Policies	NOTE 3. SIGNIFICANT ACCOUNTING POLICIES PEMEX has consistently applied the following accounting policies to each of the periods presented in the preparation of its consolidated financial statements, except for what is mentioned in Note 4, Accounting changes, splits, adjustments, reclassifications and corrections of non-material errors. Below is a summary of the principal accounting policies: A. Basis of consolidation The consolidated financial statements include the financial statements of Petróleos Mexicanos and those of its subsidiaries over which it has control. i. Subsidiaries Subsidiaries are entities controlled by PEMEX. PEMEX “controls” an entity when it is exposed to, or has rights to, variable returns from its involvement with the entity and has the ability to affect those returns through its power over the entity. The financial statements of subsidiaries are included in the consolidated financial statements from the date on which control commences until the date on which control ceases. For more information about the Subsidiary Companies, see Note 5. ii. Non-controlling NCI are measured initially at their proportionate share of the acquiree’s identifiable net assets at the date of acquisition. Changes in the ownership interest in a subsidiary that do not result in a loss of control are accounted for as equity transactions. iii. Loss of control When PEMEX loses control over a subsidiary, it derecognizes the assets and liabilities of the subsidiary, and any related NCI and other components of equity. Any resulting gain or loss is recognized in profit or loss. Any interest retained in the former subsidiary is measured at fair value when control is lost. iv. Interests in equity-accounted investees PEMEX’s interests in equity-accounted investees comprise interests in associates and a joint venture. Associates are those entities in which PEMEX has significant influence, but not control or joint control, over the financial and operating policies. A joint venture is an arrangement in which PEMEX has joint control, whereby PEMEX has rights to the net assets of the arrangement, rather than rights to its assets and obligations for its liabilities (joint operation). Interests in associates and the joint venture are accounted for using the equity method. They are initially recognized at cost, which includes transaction costs. Subsequent to initial recognition, the consolidated financial statements include PEMEX’s share of the profit or loss and other comprehensive income (OCI) of equity accounted investees, until the date on which significant influence or joint control ceases. When the value of the share of losses exceeds the value of PEMEX’s investment in an associate or joint venture, the carrying value of the investment, including any long-term investment, is reduced to zero and PEMEX ceases to recognize additional losses, except in cases where PEMEX is liable for obligations incurred by those associates and joint ventures. For more information about joint ventures and associates, see Note 12. v. Transactions eliminated on consolidation Intra-group balances and transactions, and any unrealized income and expenses arising from intra-group transactions, are eliminated. Unrealized gains arising from transactions with equity-accounted investees are eliminated against the investment to the extent of the PEMEX interest in the investee. Unrealized losses are eliminated in the same way as unrealized gains, but only to the extent that there is no evidence of impairment. B. Foreign currency i. Foreign currency transactions Transactions in foreign currencies are translated into the respective functional currencies of PEMEX companies at the exchange rates at the dates of the transactions. Monetary assets and liabilities denominated in foreign currencies are translated into the functional currency at the exchange rate at the reporting date. Non-monetary Non-monetary ii. Foreign operation The financial statements of foreign subsidiaries and associates are translated into the reporting currency by first identifying if the functional currency is different from the currency for recording the foreign operations, and, if so, the recording currency is translated into the functional currency and then into the reporting currency using the year-end Foreign currency differences are recognized in OCI and accumulated in the currency translation effect, except to the extent that the translation difference is allocated to NCI. When a foreign operation is disposed of in its entirety or partially such that control, significant influence or joint control is lost, the cumulative amount in the translation reserve related to that foreign operation is reclassified to the consolidated statement of comprehensive income as part of the gain or loss on disposal. If PEMEX disposes of part of its interest in a subsidiary but retains control, then the relevant proportion of the cumulative amount is reattributed to NCI. When PEMEX disposes of only part of an associate or joint venture while retaining significant influence or joint control, the relevant proportion of the cumulative amount is reclassified to profit or loss. C. Financial instruments i. Recognition and initial measurement Financial assets and liabilities, including accounts receivable and payable, are initially recognized when these assets are contractually originated or acquired, or when these liabilities are contractually issued or assumed. Financial assets and financial liabilities (unless it is an account receivable or account payable without a significant financing component) are measured and initially recognized at fair value, in the case of financial assets or liabilities not measured at fair value with changes through OCI, plus the transaction costs directly attributable to acquisition or issuance, when subsequently measured at amortized cost. An account receivable or account payable without a significant financing component is initially measured at the transaction price. If PEMEX determines that the fair value at the initial recognition differs from the transaction price, PEMEX shall recognize the difference between the fair value at initial the recognition and the transaction price in the consolidated statements of comprehensive income. ii. Classification and subsequent measurement Financial Assets – On initial recognition, a financial asset is classified as measured at: Amortized Cost; Fair Value Through Other Comprehensive Income (“FVTOCI”)-debt investment; FVTOCI–equity investment; or Fair Value Through Profit or Loss (“FVTPL”). Financial assets are not reclassified subsequent to their initial recognition unless PEMEX changes its business model for managing financial assets, in which case all affected financial assets are reclassified on the first day of the first reporting period following the change in the business model. FINANCIAL ASSETS MEASUREMENT Amortized cost A financial asset is measured at amortized cost if it meets both of the following conditions and is not designated as at FVTPL: •   it is held within a business model that has the objective of holding assets to collect contractual cash flows; and •   its contractual terms give rise on specified dates to cash flows that are solely payments of principal and interest on the principal amount outstanding. Debt investment A debt instrument is measured at FVTOCI only if it meets both of the following conditions and is not designated as at FVTPL: •   it is held within a business model that has the objective of both collecting contractual cash flows and selling financial assets; and •   its contractual terms give rise on specified dates to cash flows that are solely payments of principal and interest on the principal amount outstanding. Equity investment On initial recognition of an equity investment that is not held for trading, PEMEX may irrevocably elect to present subsequent changes in fair value in OCI. This election is made on an investment-by-investment All financial assets not classified as measured at amortized cost or FVTOCI (as described above) are measured at FVTPL. This includes all derivative financial assets (see Note 18). On initial recognition, PEMEX may irrevocably designate a financial asset that otherwise meets the requirements to be measured at amortized cost or at FVOCI as FVTPL, if doing so eliminates or significantly reduces an accounting mismatch that would otherwise arise. Financial assets: Business model assessment – PEMEX makes an assessment of the objective of the business model in which a financial asset is held at a portfolio level because this best reflects the way the business is managed and information is provided to management. The information considered includes: • the stated policies and objectives for the portfolio and the operation of those policies in practice, which include whether management’s strategy focuses on earning contractual interest income, maintaining a particular interest rate profile, matching the duration of the financial assets to the duration of any related liabilities or expected cash outflows or realizing cash flows through the sale of the assets; • how the performance of the portfolio is evaluated and reported to PEMEX management; • the risk that affects the performance of the business model (and the financial assets held within that business model) and how those risks are managed; • how managers of the business are compensated (e.g., whether compensation is based on the fair value of the assets managed or the contractual cash flows collected); and • the frequency, volume and timing of sales in prior periods, the reasons for such sales and expectations about future sales activity. Transfers of financial assets to third parties in transactions that do not qualify for derecognition are not considered sales for this purpose, consistent with PEMEX’s continuing recognition of the assets. Financial assets that are held for trading or managed and the performance of which is evaluated on a fair value basis are measured at FVTPL. Financial Asset: Assessment whether contractual cash flows are solely payments of principal and interest – For the purposes of this assessment, principal is defined as the fair value of the financial assets on initial recognition. Interest is defined as consideration for the time value of money and for the credit risk associated with the principal amount outstanding during the relevant period of time and for the basic lending risks and costs (e.g., liquidity risk and administrative costs), as well as profit margin. In assessing whether the contractual cash flows are solely payments of principal and interest, PEMEX considers the contractual terms of the instrument, which includes assessing whether the financial asset contains a contractual term that could change the timing or amount of contractual cash flows such that it would not meet this condition. In making this assessment, PEMEX considers: • contingent events that would change the amount or timing of cash flows; • terms that may adjust the contractual coupon rate, including variable rate features; • prepayment and extension features; and • terms that limit PEMEX’s claim to cash flows from specified assets (for example, non-recourse A prepayment feature is consistent solely with the payments of principal and interest criterion if the prepayment amount substantially represents unpaid amounts of principal and interest on the principal amount outstanding, which may include reasonable additional compensation for early termination of the contract. Additionally, for a financial asset acquired at a significant discount or premium to its contractual par amount, a feature that permits or requires prepayment at an amount that substantially represents the contractual par amount plus accrued (but unpaid) contractual interest (which may also include reasonable additional compensation for early termination) is treated as consistent with this criterion if the fair value of the prepayment feature is insignificant at initial recognition. Financial assets: Subsequent measurement and gain and losses – Financial assets at FVTPL Financial assets at FVTPL are measured at fair value and changes therein, including any interest or dividend income, are recognized in profit or loss. Financial assets at amortized cost These assets are subsequently measured at amortized cost using the effective interest method. The amortized cost is reduced by impairment losses. Interest income, foreign exchange gains and losses and impairment are recognized in profit or loss. Any gain or loss on derecognition is recognized in profit or loss. Debt investments at FVOCI These assets are subsequently measured at fair value. Interest income calculated using the effective interest method, foreign exchange gains and losses and impairment are recognized in profit or loss. Other net gains and losses are recognized in OCI. On derecognition, gains and losses accumulated in OCI are reclassified to profit or loss. Equity investments at FVOCI These assets are subsequently measured at fair value. Dividends are recognized as income in profit or loss unless the dividend clearly represents a recovery of part of the cost of the investment. Other net gains and losses are recognized in OCI and are never reclassified to profit or loss. Financial liabilities: Classification, subsequent measurement and gains and losses – Financial liabilities are classified as measured at amortized cost or FVTPL. A financial liability is classified as FVTPL if it is classified as held-for-trading, iii. Derecognition Financial assets – PEMEX derecognizes a financial asset when the contractual rights to the cash flows from the financial asset expire, or it transfers the rights to receive the contractual cash flows in a transaction in which substantially all of the risks and rewards of ownership of the financial asset are transferred or in which PEMEX neither transfers nor retains substantially all of the risks and rewards of ownership and it does not retain control of the financial asset. PEMEX enters into transactions whereby it transfers assets recognized in its statement of financial position but retains either all or substantially all of the risks and rewards of the transferred assets. In these cases, the transferred assets are not derecognized. Financial liabilities – PEMEX derecognizes a financial liability when its contractual obligations are discharged, cancelled or expired. PEMEX also derecognizes a financial liability when its terms are modified and the cash flows of the modified liability are substantially different, in which case a new financial liability based on the modified terms is recognized at fair value. On derecognition of a financial liability, the difference between the carrying amount extinguished and the consideration paid (including any non-cash iv. Offsetting Financial assets and financial liabilities are offset, and the net amount is presented in the statement of financial position when, and only when, PEMEX has a legally enforceable right to set off the amounts and it intends either to settle them on a net basis or to realize the asset and settle the liability simultaneously. v. Derivative financial instruments and hedge accounting PEMEX uses DFIs to hedge the risk exposure in foreign currency, interest rate and the price of commodities related to its products. Embedded derivatives are separated from the host contract and accounted for separately if the host contract is not a financial asset and certain criteria are met. These contracts are not accounted as designated hedging instruments. DFIs are accounted for as financial assets when the fair value is positive and as a financial liability when the fair value is negative. vi. Impairment Financial instruments and contract assets – PEMEX recognizes loss allowances for Estimated Credit Losses (“ECLs”) on: • financial assets measured at amortized cost; • debt investments measured at FVOCI; and • contract assets. PEMEX measures loss allowances at an amount equal to lifetime ECL, except for the following, which are measured as 12-month • debt securities that are determined to have low credit risk at the reporting date; and • other debt securities and bank balances for which credit risk (i.e. the risk of default occurring over the expected life of the financial instrument) has not increased significantly since initial recognition. PEMEX considers a financial asset to be in default when the debtor is unlikely to pay its credit obligations to PEMEX in full, without recourse by PEMEX to actions such as guarantee redemption (if any is held). PEMEX considers that a debt instrument has a low credit risk, when its credit rating is classified as “investment grade”. The investment grade classification is based on minimum credit ratings of Baa3 (Moody’s) and BBB- Lifetime ECLs are the credit losses that result from all possible default events over the expected life of a financial instrument. 12-month The maximum period considered when estimating ECLs is the maximum contractual period over which PEMEX is exposed to credit risk. Measurement of ECLs – ECLs are a probability-weighted estimate of credit losses. Credit losses are measured as the present value of all cash shortfalls (for example, the difference between the cash flows due to the entity in accordance with the contract and the cash flows that PEMEX expects to receive). Credit-impaired financial assets – At each reporting date, PEMEX assesses whether financial assets carried at amortized cost and debt securities at FVOCI are credit-impaired. A financial asset is ‘credit-impaired’ when one or more events that have a detrimental impact on the estimated future cash flows of the financial asset have occurred. Evidence that a financial asset is credit-impaired includes the following observable data: • significant financial difficulty of the borrower or issuer; • a breach of contract such as a default or being more than 90 days past due; • the restructuring of a loan or advance by PEMEX on terms that it would not consider otherwise; • it is probable that the borrower will enter bankruptcy or other financial reorganization; or • the disappearance of an active market for a security because of financial difficulties. Presentation of allowance for ECL in the statement of financial position – Loss allowances for financial assets measured at amortized cost are deducted from the gross carrying amount of the assets. Write-off The gross carrying amount of a financial asset is written off when PEMEX has no reasonable expectation of recovering a financial asset in its entirety or a portion thereof. In the case of individual customers, PEMEX’s policy is to cancel the gross carrying amount when the financial asset has met the uncollectibility report as established in the Pol í ticas Generales y Procedimientos para Cancelar Adeudos write-off write-off D. Inventories and cost of sales Inventories are valued at the lower of cost or net realizable value. Cost is determined based on the cost of production or acquisition of inventory and other costs incurred in transporting such inventory to its present location and in its present condition, using the average cost method. Net realizable value is the estimated selling price in the ordinary course of business less the estimated costs of completion and the estimated selling costs. The estimate takes into consideration, among other things, the decrease in the value of inventories due to obsolescence. Cost of sales represents the cost of production or acquisition of inventories at the time of sale, increased, where appropriate, by declines in net realizable value of inventories during the year. Advance payment to suppliers for inventory purchases are recognized as part of inventory when the risks and benefits of the ownership of the inventory have been transferred to PEMEX. E. Wells, pipelines, properties, plant and equipment i. Recognition and measurement Items of wells, pipelines, properties, plant and equipment are recorded at acquisition or construction cost, which includes capitalized borrowing cost, less accumulated depreciation and accumulated impairment losses. Initial costs of wells, pipelines, properties, plant and equipment are initially recorded at cost, which includes their original purchase price or construction cost, any costs attributable to bringing the assets to a working condition for their intended use and the costs of dismantling and removing the items and restoring the site on which they are located, including the estimated cost of plugging and abandoning wells. The cost of financing projects that require large investments and financing incurred for projects, net of interest revenues from the temporary investment of these funds, is recognized as part of wells, pipelines, properties, plant and equipment when the cost is directly attributable to the construction or acquisition of a qualifying asset. The capitalization of these costs is suspended during periods in which the development of construction is interrupted, and its capitalization ends when the activities necessary for the use of the qualifying asset are substantially completed. All other financing costs are recognized in the consolidated statements of comprehensive income in the period in which they are incurred. The cost of self-constructed assets includes the cost of materials and direct labor, interest on financing and any other costs directly attributable to start up. In some cases, the cost also includes costs of plugging of wells and removal at present value. Expenditures related to the construction of wells, pipelines, properties, plant and equipment during the stage prior to commissioning are stated at cost as intangible assets or construction in progress, in accordance with the characteristics of the asset. Once the assets are ready for use, they are transferred to the respective component of wells, pipelines, properties, plant and equipment and depreciation or amortization begins. If significant parts of an item of wells, pipelines, properties, plant and equipment have different useful lives, then they are accounted for as separate items (major components) of property, plant and equipment. Any gain or loss on disposal of an item of wells, pipelines, properties, plant and equipment is recognized in profit or loss. Advance payments for the acquisition of pipelines, properties, plant and equipment are also recognized in the line item of wells, pipelines, properties, plant and equipment when the risks and benefits of the ownership have been transferred to PEMEX. ii. Subsequent expenditure The costs of major maintenance or replacement of a significant component of an item of wells, pipelines, properties, plant and equipment are recognized in the carrying amount of the item if it is probable that the future economic benefits embodied within the component will flow to PEMEX and its cost can be measured reliably. The costs of recurring maintenance, repairs and renovations of wells, pipelines, properties, plant and equipment carried out to maintain the facilities in normal operation conditions are recognized in profit or loss as incurred. iii. Depreciation Depreciation and amortization of capitalized costs in wells are determined based on the estimated economic life of the field to which the wells belong, considering the relationship between the production of barrels of oil equivalent for the period and proved developed reserves of the field, as of the beginning of the period, with quarterly updates for new development investments. Depreciation of other elements of pipelines, properties, plant and equipment is recognized in profit or loss on a straight-line basis over the estimated useful life of the asset, beginning as of the date that the asset is available for use, or in the case of construction, from the date that the asset is completed and ready for use. Until December 2018, properties, plant and equipment acquired through financial leases were depreciated over the shorter of the lease term or the useful life of the asset. The estimated useful lives of wells, pipelines, properties, plant and equipment for current and comparative periods are described in Note 13. Estimated useful lives of items of properties, plant and equipment are reviewed and updated prospectively if expectations differ from previous estimates. F. Intangible assets and oil and natural gas exploration and license, appraisal and development expenditure i. Intangible assets Intangible assets acquired separately are measured at initial recognition at their acquisition cost. After the initial recognition, intangible assets are valued at their acquisition cost, less: (i) accumulated amortization, under the straight-line method during the estimated useful life of the intangible asset and (ii) accumulated impairment losses. Subsequent expenditure is capitalised only when it increases the future economic benefits embodied in the specific asset to which it relates. All other expenditure is recognized in profit or loss as incurred. Software licenses are amortized over the lesser of their contract period or the remaining life of the asset to which they are associated. The estimated useful lives of elements of intangible assets for current and comparative periods are described in Note 14. The estimated useful lives and residual values of intangible assets are reviewed at each reporting date and adjusted if appropriate. ii. Wells not assigned to a reserve, oil and natural gas exploration, appraisal and development expenditure a. Wells not assigned to a reserve Wells not assigned to a reserve mainly include drilling, evaluation and development costs for oil and natural gas, and rights-of-way. b. Oil and natural gas exploration, appraisal and development expenditures Oil and natural gas exploration, evaluation and development expenses are accounted for using the principles of the successful efforts method of accounting, as described below: Successful Efforts Method – Pemex Exploration and Production applies IFRS 6 - Exploration and Evaluation of Mineral Resources, which allows an entity to develop an accounting policy for exploration and evaluation assets. Therefore, Pemex Exploration and Production uses the method of successful efforts, which requires a cause and effect relationship between the costs incurred and the recognition of specific reserves. Generally, if a cost is incurred without an identifiable future benefit, it is charged to expenses. Before PEMEX is able to determine the accounting treatment of a cost, it must be classified as a property acquisition, exploration, development or production cost. Exploration and appraisal expenditure – Geological and geophysical exploration costs including topographic costs, geological studies, property access rights, remuneration and expenses of geologists and geophysicists are charged to expenses as incurred. Costs directly associated with an exploration well, other than the costs mentioned in the preceding paragraph, are initially capitalized as an intangible asset (wells not assigned to a reserve) until the drilling of the well is complete and the results have been evaluated. These costs include employee compensation, materials and fuel used, platform costs and payments made to contractors. If potentially commercial quantities of hydrocarbons are not found, the exploration well costs are written off against profit or loss. If hydrocarbons are found and, subject to additional assessment activity, are likely to be capable of commercial development, the costs continue to be carried as an asset. If it is determined that development will not occur, then the costs are expensed against profit or loss. Costs directly associated with the evaluation activity performed to determine the size, characteristics and commercial potential of a reserve after the initial hydrocarbon discovery, including the costs of evaluation of wells where no hydrocarbons were found, are initially capitalized as an intangible asset (wells not assigned to a reserve). When proved reserves of oil and natural gas are determined and development is approved by management, the relevant expenditure is transferred to wells, pipelines, properties, plant and equipment. Exploration wells more than 12 months old are recognized as an expense unless: (a)(i) they are in an area requiring major capital expenditure before production can begin, (ii) commercially productive quantities of reserves have been found, and (iii) they are subject to further exploration or appraisal activity, in that, either drilling or additional exploration wells are underway or firmly planned for the near future or (b) proved reserves are recorded within 12 months of completion of the exploratory drilling. PEMEX periodically assesses the amounts included within fixed assets to determine whether capitalization is initially appropriate and can continue. Exploration wells capitalized beyond 12 months are subject to additional scrutiny as to whether the facts and circumstances have changed and therefore whether the conditions described in the preceding paragraph no longer apply. Development expenditure – Expenditure on the construction, installation and completion of infrastructure facilities such as platforms, pipelines and the drilling of development wells, including service and unsuccessful development or delineation wells, is capitalized within wells, pipelines, properties, plant and equipment and is depreciated from the commencement of production as described in the accounting policy for wells, pipelines, properties, plant and equipment. Exploration – Exploration includes all expenses related to the search for oil and / or gas reserves, including depreciation and applicable costs of supporting equipment and facilities, and the costs of drilling exploratory wells and exploratory stratigraphic wells. Some exploration costs are charged directly to expenses when they occur, such as the costs of maintaining unexploited properties, since such costs do not increase the possibilities that said lands contain proven reserves. The costs of geologists, topographers and geophysicists, including wages and other related expenses, are also charged directly to expenses when they occur because they do not represent the acquisition of an identifiable asset since these studies represent research expenses. All costs for drilling exploratory wells are capitalized and classified as wells, pipelines, property, plant and equipment, not associated with a reserve, until it is determined whether or not a well has proven reserves. Once the exploratory wells are completed, the future treatment of these costs is determined. Development – Development costs are associated with previously discovered proven reserves, with previously known future benefits. Therefore, all costs incurred in development activities must be capitalized. Development includes all costs incurred in creating a system of productive wells, related equipment, and facilities in proven reserves so that oil and / or gas can be extracted. Developmental costs are related to specific proven reserves. The cost of building roads to gain access to proven reserves is a development cost, as is the cost of providing facilities for the extraction, treatment, collection and storage of oil and / or gas. Developmental costs also include depreciation and operating costs of equipment and facilities used in developmental activities. Likewise, non-productive Production – Production includes the costs incurred to raise oil and / or gas to the surface, its collection, treatment, processing and field storage. The production function ends in the storage tank of the production field or, in exceptional circumstances, at the first point of delivery of the oil and / or gas to the main line, refinery, marine terminal or common transport. G. Crude oil and natural gas reserves Under Mexican law, all crude oil and other hydrocarbon reserves located in the subsoil of Mexico are owned by the Mexican nation and not by PEMEX. In accordance with the aforementioned and based on the applicable regulation as of the date of these consolidated financial statements, the reserves assigned to PEMEX by the Mexican Government are not registered for accounting purposes because they are not PEMEX’s property. PEMEX estimates total proved oil and natural gas reserve volumes in accordance with the definitions, methods and procedures established in Rule 4-10(a) S-X 4-10(a)”) Although PEMEX does not own the oil and other hydrocarbon reserves within Mexico, these procedures allow PEMEX to record the effects that such oil and other hydrocarbon reserves have on its con

Accounting Changes Splits Adjus

Accounting Changes Splits Adjustments Reclassifications and Corrections of Non-Material Errors	12 Months Ended
	Dec. 31, 2020
Text block [abstract]
Accounting Changes Splits Adjustments Reclassifications and Corrections of Non-Material Errors	NOTE 4. ACCOUNTING CHANGES, SPLITS, ADJUSTMENTS, RECLASSIFICATIONS AND CORRECTIONS OF NON-MATERIAL A. Accounting changes Accounting changes as of January 1, 2020 The following new standards were effective as of January 1, 2020, but they did not have a material effect on PEMEX’s consolidated financial statements: • Amendments to References to Conceptual Framework in IFRS Standards. • Definition of a Business (Amendments to IFRS 3). • Definition of Material (Amendments to IAS 1 Presentation of Financial Statements and IAS 8 Accounting Policies, Changes in Accounting Estimates and Errors). • The interest rate benchmark reform amendments retrospectively to hedging relationships. Accounting changes as of January 1, 2019 a. IFRS 16 “Leases” (“IFRS 16”) In January 2016, the IASB published IFRS 16, which replaced IAS 17, “Leases” and related interpretations, including IFRIC 4 “Determining whether an Arrangement contains a Lease” (“IFRIC 4”). From January 1, 2019, PEMEX applied IFRS 16 for the first time. Several other amendments and interpretations began to apply for the first time in 2019, but do not have a material impact on the consolidated financial statements of PEMEX. IFRS 16 introduces a single, on balance sheet accounting model for lessees. A lessee recognizes a right-of-use low-value PEMEX applied IFRS 16 initially on January 1, 2019 using the modified retrospective approach. There was no impact on retained earnings because as of January 1, 2019 the rights of use and the lease liability were for the same amount (in addition to a reclassification of the previously recognized finance leases). Accordingly, the comparative information presented for 2018 has not been restated and it is presented, as previously reported, under IAS 17 and related interpretations. The details of the changes in accounting policies are disclosed below. i. Definition of a lease Previously, PEMEX determined at contract inception whether an arrangement was or contained a lease under IFRIC 4. PEMEX now assesses whether a contract is or contains a lease based on the new definition of a lease under IFRS 16. Under IFRS 16, a contract is, or contains, a lease if the contract conveys a right to control the use of an identified asset for a period of time in exchange for consideration. On transition to IFRS 16, PEMEX elected to apply the practical expedient to adopt the definition of lease at the time of transition. This means it applied IFRS 16 to all contracts entered into before January 1, 2019 and identified as leases in accordance with IAS 17 and IFRIC 4. The definition of a lease under IFRS 16 has been applied only to contracts entered into or modified on or after January 1, 2019. ii. As a lessee PEMEX recognizes assets and liabilities for its operating leases, which primarily consist of transportation and railway equipment, docks, hydrogen supply plants, electric power and steam gas storage facilities. As a lessee, PEMEX previously classified leases as operating or finance leases based on its assessment of whether the lease transferred substantially all of the risks and rewards of ownership. Under IFRS 16, PEMEX recognizes right-of-use on-balance PEMEX has elected not to recognize right-of-use Significant accounting policy – PEMEX recognizes a right-of-use right-of-use The lease liability is initially measured at the present value of the lease payments that are not paid at the commencement date, discounted using the interest rate implicit in the lease or, if that rate cannot be readily determined, PEMEX’s incremental borrowing rate. PEMEX uses its incremental borrowing rate as the discount rate. The lease liability is subsequently measured as increased by the interest cost on the lease liability and decreased by lease payments made. It is remeasured when there is a change in future lease payments arising from a change in an index or rate, a change in the estimate of the amount expected to be payable under a residual value guarantee or, as appropriate, changes in the assessment of whether a purchase or extension option or reasonably certain to be exercised or a termination option is reasonably certain not to be exercised. PEMEX has applied judgement to determine the lease term for some lease contracts in which it is a lessee that include renewal options. The assessment of whether PEMEX is reasonably certain to exercise such options impacts the lease term, which significantly affects the amount of lease liabilities and right-of-use Transition – Previously, PEMEX classified a number of leases as operating leases under IAS 17. These leases included transportation and railway equipment, docks, hydrogen supply plants, electric power and steam gas storage facilities. The leases typically ran for a period of up to 20 years. Some leases included an option to renew the lease for an additional 5 years or an undefined term after the end of the non-cancellable At transition, for leases classified as operating leases under IAS 17, lease liabilities were measured at the present value of the remaining lease payments, discounted at PEMEX’s incremental borrowing rate as at January 1, 2019. Right-of-use PEMEX used the following practical expedients when applying IFRS 16 to leases previously classified as operating leases under IAS 17: • Applied the exemption not to recognize right-of-use • Excluded initial direct costs when measuring the right-of-use • Used hindsight when determining the lease term if the contract contains options to extend or terminate the lease. PEMEX leases certain production equipment that were classified as finance leases under IAS 17. For these leases, the carrying amount of the right-of PEMEX reclassified intangible assets to rights of use of the rights of way that they had registered in that concept until December 31, 2018. iii. Impacts on financial statements Impact in the transition – On transition to IFRS 16 (effective as of January 1, 2019), PEMEX recognized additional right-of-use Total Right of use assets Ps. 72,760,580 * Lease liability Ps. 70,651,797 * Includes the reclassification of rights of way that were presented as intangible assets. The liability is not recognized due to prepayments made. When measuring lease liabilities for leases that were classified as operating leases, PEMEX discounted lease payments using its incremental borrowing rate at January 1, 2019. The weighted-average rate applied was 7.7%. 2019 Operating lease commitment at December 31, 2018 Ps. 62,723,909 Undisclosed leases in 2018 Financial statements 40,186,551 Operating lease commitment 102,910,460 Operating lease commitment discounted using the incremental borrowing rate at January 1, 2019 Ps. 65,608,174 Lease liabilities from financial leases previously recognized up to December 31, 2018 6,053,280 Recognition exemption for: Short-term leases (1,009,657 ) Lease liabilities recognized at January 1, 2019 Ps. 70,651,797 Some other accounting standards were effective as of January 1, 2019 but did not have a significant impact on PEMEX’s consolidated financial statements. B. Reclassifications and correction of non-material PEMEX reclassified certain non-material amounts reported in the statement of financial position and statement of comprehensive income for the years ended December 31, 2019 and 2018 to conform their presentation to the statement of financial position and statement of comprehensive income for 2020. The reclassifications were as follows: i. To report other accounts receivable in two separate line items, other financing receivables and other non-financing ii. To reclassify insurance, from other non-current iii. To reclassify derivative financial instruments (cost) income, net to finance income and finance cost. The correction of non-material iv. During 2020, PEMEX detected errors in certain costs and expenses used for the determination of the value in use of certain CGUs in the exploration and production segment as of December 31, 2019. This resulted in a different value in use in some CGUs and thus, an increase in the value of wells, pipelines, plants and platforms as of December 31, 2019 in the amount of Ps. 65,799,060 Consolidated Statement of Financial Position Line item Note 2019 Previously Reclassification Adjustment of 2019 Updated Other accounts receivable (i) Ps. 91,241,811 (91,241,811 ) — — Other financing receivables 10-B — 31,416,091 — 31,416,091 Other non-financing 10-B — 59,825,720 — 59,825,720 Other current assets (ii) 346,563 2,482,670 — 2,829,233 Total current assets 340,552,371 2,482,670 — 343,035,041 Wells, pipelines, properties, plant and equipment, net 1,211,749,502 — 65,799,060 1,277,548,562 Other assets (ii) 7,136,677 (2,482,670 ) — 4,654,007 Total non-current 1,577,895,649 (2,482,670 ) 65,799,060 1,641,212,039 Accumulated deficit from prior years (1,933,106,785 ) — — (1,933,106,785 ) Net loss for the year (347,289,362 ) — 65,799,060 (281,490,302 ) Total equity (deficit) (1,997,208,362 ) — 65,799,060 (1,931,409,302 ) Consolidated Statement of Comprehensive income Line item 2019 Previously Reclassification Adjustment of 2019 Updated Cost of sales Ps. 1,122,933,424 — — 1,122,933,424 (Impairment) reversal of impairment of wells, pipelines, properties, plant and equipment, net (97,082,214 ) — 65,799,060 (31,283,154 ) Total cost of sales, net 1,220,015,638 — 65,799,060 1,154,216,578 Finance income 24,483,706 4,751,897 — 29,235,603 Derivative financial instruments (cost) income, net (18,512,026 ) (4,751,897 ) — (23,263,923 ) Sum of financing (costs) net, derivative instruments (cost) and foreign exchange gains, net (39,959,272 ) — — (39,959,272 ) Net loss (347,911,084 ) — 65,799,060 (282,112,024 ) Consolidated Statement of Comprehensive income Line item 2018 Previously Reclassification 2018 Updated Finance cost Ps. (120,727,022 ) (3,142,662 ) (123,869,684 ) Derivative financial instruments (cost) income, net 22,258,613 3,142,662 (19,115,951 ) Sum of financing (costs) net, derivative instruments (cost) and foreign exchange gains, net (87,769,033 ) — (87,769,033 ) Net loss (180,419,837 ) — (180,419,837 ) Consolidated Statement of cash flows Line item 2019 Previously Reclassification Adjustment of 2019 Updated Net loss Ps. (347,911,084 ) — 65,799,060 (282,112,024 ) (Impairment) reversal of impairment) deterioration of wells, pipelines, properties, plant and equipment, net 97,082,214 — (65,799,060 ) 31,283,154 Interest income (24,483,706 ) (4,751,897 ) — (29,235,603 ) Funds from operating activities 351,322,756 (4,751,897 ) — 346,570,859 Accounts receivable (13,285,925 ) 4,751,897 — (8,534,028 ) Net cash flows from operating activities 85,220,514 — — 85,220,514 Consolidated Statement of cash flows Line item 2018 Previously Reclassification 2018 Updated Interest expense 120,727,022 3,142,662 123,869,684 Funds from operating activities 513,218,562 3,142,662 516,361,224 Accounts receivable (286,509 ) (3,142,662 ) (3,429,171 ) Net cash flows from operating activities 141,786,590 — 141,786,590

Subsidiary Entities and Subsidi

Subsidiary Entities and Subsidiary Companies	12 Months Ended
	Dec. 31, 2020
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Subsidiary Entities and Subsidiary Companies	NOTE 5. SUBSIDIARY ENTITIES AND SUBSIDIARY COMPANIES As of December 31, 2020 and 2019, the Subsidiary Entities consolidated in these financial statements include Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Logistics and Pemex Fertilizers. Former Subsidiary Entities Pemex Drilling and Services and Pemex Ethylene were also consolidated in these financial statements until June 30, 2019 and Pemex Cogeneration and Services was also consolidated in these financial statements until July 27, 2018. As of December 31, 2020 and 2019, the consolidated Subsidiary Companies are as follows: • PEP Marine DAC (PEP DAC) (vii)(x) • P.M.I. Services B.V. (PMI SHO) (i)(iv) • P.M.I. Holdings B.V. (PMI HBV) (i)(ix)(xiv) • P.M.I. Trading DAC (PMI Trading) (i)(ix)(xiii) • P.M.I. Holdings Petróleos España, S. L. (HPE) (i)(ix)(x) • P.M.I. Services North America, Inc. (PMI SUS) (i)(ix)(xii) • P.M.I. Norteamérica, S.A. de C.V. (PMI NASA) (i)(ix) (x) • P.M.I. Comercio Internacional, S.A. de C.V. (PMI CIM) (i)(ii) (x) • PMI Campos Maduros SANMA, S. de R.L. de C.V. (SANMA) (ix) (x) • Pro-Agroindustria, (ix) (x) • PTI Infraestructura de Desarrollo, S.A. de C.V. (PTI ID) (iii) (ix) (x) • PMI Cinturón Transoceánico Gas Natural, S.A. de C.V. (PMI CT) (i)(v) • PMI Transoceánico Gas LP, S.A. de C.V. (PMI TG) (i)(v) • P.M.I. Servicios Portuarios Transoceánico, S.A. de C.V. (PMI SP) (i)(ix) (x) • P.M.I. Midstream del Centro, S.A. de C.V. (PMI MC) (i)(viii) • Pemex Procurement International, Inc. (PPI) (ix)(xii) • Hijos de J. Barreras, S. A. (HJ BARRERAS) (ii) (vi) • Pemex Finance Limited (FIN) (ix)(xvi) • Mex Gas Internacional, S.L. (MGAS) (ix) (x) • Pemex Desarrollo e Inversión Inmobiliaria, S.A. de C.V. (PDII) (ix) (x) • Kot Insurance Company AG. (KOT) (ix)(xv) • PPQ Cadena Productiva, S.L. (PPQCP) (ix) (x) • III Servicios, S.A. de C.V. (III Servicios) (ix) (x) • PMI Ducto de Juárez, S. de R.L. de C.V. (PMI DJ) (i) (ix) (x) • PMX Fertilizantes Holding, S.A de C.V. (PMX FH) (ix) (x) • PMX Fertilizantes Pacífico, S.A. de C.V. (PMX FP) (ix) (x) • Grupo Fertinal, S.A. de C.V. (GP FER) (ix) (x) • Compañía Mexicana de Exploraciones, S.A. de C.V. (COMESA) (ii) (x) • P.M.I Trading México, S.A. de C.V. (TRDMX) (i) (ix) (x) • Holdings Holanda Services, B.V. (HHS) (ix)(xiv) i. Member Company of the “PMI Subsidiaries”. ii. Non-controlling iii. Formerly P.M.I. Infraestructura de Desarrollo, S.A. de C.V. until March 5, 2019. On May 30, 2019 these shares were transferred to Pemex Industrial Transformation. iv. This company was liquidated in December 2019. v. These companies were merged into PMI NASA in 2020. vi. As of May 2020, this company is not included in the consolidation (see Note 22-G). vii. This company was liquidated in August 2020. viii. This company was liquidated in April 2020. ix. PEMEX owns 100.0% of the interests in this Subsidiary Company x. Operates in México xi. Operates in Spain xii. Operates in United States of America xiii. Operates in Ireland xiv. Operates in Netherlands xv. Operates in Switzerland xvi. Operates in Cayman Islands

Segment financial information

Segment financial information	12 Months Ended
	Dec. 31, 2020
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Segment financial information	NOTE 6. SEGMENT FINANCIAL INFORMATION PEMEX’s primary business is the exploration and production of crude oil and natural gas, as well as the production, processing, marketing and distribution of petroleum and petrochemical products. As of December 31, 2020, PEMEX’s operations were conducted through six business segments: Exploration and Production, Industrial Transformation, Logistics, Fertilizers, the Trading Companies and Corporate and other operating Subsidiary Companies. Until June 30, 2019, PEMEX’s operations were also conducted through the additional two business segments: Drilling and Services (merged into Pemex Exploration and Production as of July 1, 2019) and Ethylene (merged into Pemex Industrial Transformation as of July 1, 2019). Prior to July 27, 2018, PEMEX’s operations were also conducted through the Cogeneration and Services business segment (liquidated company as of July 27, 2018). Due to PEMEX’s structure, there are significant amounts of inter-segment sales among the reporting segments, which are made at market prices. The primary sources of revenue for PEMEX’s business segments are as described below: • The exploration and production segment earns revenues from domestic sales of crude oil and natural gas, and from exporting crude oil through certain of the Trading Companies. Crude oil export sales are made through the agent subsidiary company PMI CIM, to 19 major customers in various foreign markets. Approximately half of PEMEX’s crude oil is sold to Pemex Industrial Transformation. • The industrial transformation segment earns revenues from sales of refined petroleum products and derivatives, mainly to third parties within the domestic market. This segment also sells a significant portion of the fuel oil it produces to the Comisión Federal de Electricidad Aeropuertos y Servicios Auxiliares • The industrial transformation segment also earns revenues from domestic sources generated by sales of natural gas, liquefied petroleum gas, naphtha, butane and ethane and certain other petrochemicals such as methane derivatives, ethane derivatives, aromatics and derivatives. • The logistics segment earns income from transportation and storage of crude oil, petroleum products and petrochemicals, as well as related services, which it provides by employing pipelines and offshore and onshore resources, and from providing services related to the maintenance, handling, guarding and management of these products. • The fertilizers segment earns revenues from trading ammonia, fertilizers and its derivatives, mostly in the domestic market (merged as of January 1, 2021, see Note 28-E). • The trading companies segment, which consist of PMI CIM, PMI NASA, PMI Trading and MGAS (the “Trading Companies”), earns revenues from trading crude oil, natural gas and petroleum and petrochemical products in international markets. • The segment related to corporate and the Subsidiary Companies provides administrative, financing, consulting and logistical services, as well as economic, tax and legal advice and re-insurance • The drilling segment receives income from drilling services, and servicing and repairing wells. This entity was merged into Pemex Exploration and Production on July 1, 2019. • The ethylene segment earns revenues from the distribution and trade of methane, ethane and propylene in the domestic market. This entity was merged into Pemex Industrial Transformation on July 1, 2019. The following tables present the condensed financial information of these segments, after elimination of unrealized intersegment gain (loss), and include only select line items. The columns before intersegment eliminations include unconsolidated figures. As a result, the line items presented below may not total. These reporting segments are those which PEMEX’s management evaluates in its analysis of PEMEX and on which it bases its decision-making. These reporting segments are presented in PEMEX’s reporting currency. As of/ for the year ended December 31, 2020 Exploration and Production Industrial Logistics Fertilizers (1) Trading Companies Corporate and Other Intersegment eliminations Total Sales: Trade 301,393,451 477,729,504 — 1,515,464 159,786,736 8,521,205 — 948,946,360 Intersegment 242,454,754 97,303,328 80,575,471 425,374 280,924,383 98,451,594 (800,134,904 ) — Services income 133,315 190,748 4,099,000 919 229,140 62,362 — 4,715,484 (Impairment) reversal of wells, pipelines, properties, plant and equipment, net 35,031,541 (71,761,571 ) 426,560 (92,444 ) 42,214 — — (36,353,700 ) Cost of sales 391,513,815 655,617,229 43,614,768 3,070,962 430,672,407 27,536,221 (719,410,712 ) 832,614,690 Gross income (loss) 187,499,246 (152,155,220 ) 41,486,263 (1,221,649 ) 10,310,066 79,498,940 (80,724,192 ) 84,693,454 Other revenue 2,162,510 4,092,943 513,076 13,355 874,412 4,112,550 — 11,768,846 Other expenses (896,526 ) (130,926 ) (7,445 ) 6,204 (86,960 ) (113,590 ) 34,529 (1,194,714 ) Distribution, transportation and sales expenses 251,625 14,423,570 107,691 400,170 1,277,980 209,676 (4,234,470 ) 12,436,242 Administrative expenses 72,457,241 51,017,304 15,762,946 1,099,456 2,106,780 79,922,661 (76,471,944 ) 145,894,444 Operating income (loss) 116,056,364 (213,634,077 ) 26,121,257 (2,701,716 ) 7,712,758 3,365,563 16,751 (63,063,100 ) Financing income 77,700,999 223,712 3,340,622 245,510 307,229 162,801,375 (227,877,399 ) 16,742,048 Financing cost (164,419,519 ) (11,491,708 ) (450,802 ) (674,869 ) (812,552 ) (211,776,436 ) 227,860,644 (161,765,242 ) Derivative financial instruments (cost) income, net 24,939,748 22,862 — — (1,794,243 ) (6,072,226 ) — 17,096,141 Foreign exchange (loss), net (116,528,387 ) (8,893,829 ) (442,139 ) (166,971 ) (750,041 ) (2,167,937 ) — (128,949,304 ) (Loss) profit sharing in joint ventures and associates (61,956 ) 1,346,829 3,813 (2,362,891 ) (1,931,323 ) (441,711,566 ) 441,176,561 (3,540,533 ) Taxes, duties and other 154,609,136 — 4,842,171 — 3,413,999 22,706,769 — 185,572,075 Net (loss) income (216,921,887 ) (232,426,211 ) 23,730,580 (5,660,937 ) (682,171 ) (518,267,996 ) 441,176,557 (509,052,065 ) Total current assets 937,017,021 152,553,067 166,202,857 2,960,958 168,261,357 906,149,787 (2,003,285,308 ) 329,859,739 Total non-current 884,741,960 328,449,091 167,498,268 3,404,696 40,084,813 750,322,623 (575,873,262 ) 1,598,628,189 Total current liabilities 464,163,895 388,367,873 39,568,364 17,328,604 129,161,357 1,734,633,918 (2,000,813,940 ) 772,410,071 Total non-current 2,363,252,154 714,289,669 90,624,955 453,465 1,121,488 2,218,921,311 (1,827,858,155 ) 3,560,804,887 Equity (deficit), net (1,005,657,068 ) (621,655,384 ) 203,507,806 (11,416,415 ) 78,063,325 (2,297,082,819 ) 1,249,513,525 (2,404,727,030 ) Depreciation and amortization 101,126,295 19,734,723 5,917,668 10,137 317,241 2,525,756 — 129,631,820 Depreciation of rights of use 313,008 4,679,723 460,957 35,515 992,148 747,880 — 7,229,231 Net periodic cost of employee benefits excluding items recognized in other comprehensive income 35,356,366 51,176,601 8,927,651 669,076 (1,156 ) 32,680,002 — 128,808,540 (1) Merged as of January 1, 2021, see Note 28-E. As of/ for the year ended December 31, 2019 Exploration and Production (1) Industrial (2) Logistics Fertilizers Trading Corporate and Other Intersegment eliminations Total Sales: Trade 409,059,838 797,167,115 — 1,634,300 175,509,189 9,492,063 — 1,392,862,505 Intersegment 333,735,644 127,887,636 88,604,529 560,987 484,139,042 100,021,336 (1,134,949,174 ) — Services income 473,324 2,088,771 4,663,770 853 67,982 1,813,980 — 9,108,680 (Impairment) reversal of wells, pipelines, properties, plant and equipment, net (3) (104,035,887 ) 42,243,942 34,119,240 (2,298,775 ) (1,311,674 ) — — (31,283,154 ) Cost of sales 472,489,346 970,522,186 51,298,858 3,380,826 646,671,417 49,979,372 (1,071,408,581 ) 1,122,933,424 Gross income (loss) 166,743,573 (1,134,722 ) 76,088,681 (3,483,461 ) 11,733,122 61,348,007 (63,540,593 ) 247,754,607 Other revenue 6,796,590 3,110,226 202,800 22,575 444,289 4,363,967 — 14,940,447 Other expenses (6,134,114 ) (551,926 ) (311,878 ) (7,147 ) — (130,791 ) (75,835 ) (7,211,691 ) Distribution, transportation and sales expenses 262,642 24,007,852 22,467 288,347 1,323,007 31,323 (4,049,727 ) 21,885,911 Administrative expenses 59,171,975 50,652,341 8,504,381 615,830 2,575,536 68,791,707 (59,542,948 ) 130,768,822 Operating income (loss) 107,971,432 (73,236,615 ) 67,452,755 (4,372,210 ) 8,278,868 (3,241,847 ) (23,753 ) 102,828,630 Financing income (3) 87,737,456 1,938,163 697,130 65,049 801,046 156,297,750 (218,300,991 ) 29,235,603 Financing cost (134,241,910 ) (6,346,480 ) (434,392 ) (770,869 ) (971,573 ) (208,419,002 ) 218,322,886 (132,861,340 ) Derivative financial instruments (cost) income, net (3) (7,014,529 ) (9,231 ) — — (1,471,566 ) (14,768,593 ) (4 ) (23,263,923 ) Foreign exchange (loss) income, net 78,315,007 3,674,481 214,157 48,226 (212,619 ) 4,891,136 — 86,930,388 Profit (loss) sharing in joint ventures and associates 28,770 105,447 (17,682 ) (2,314,587 ) 1,195,058 (295,764,002 ) 295,609,103 (1,157,893 ) Taxes, duties and other 373,640,107 (1,446,202 ) (19,902,667 ) — 2,433,349 (10,901,098 ) — 343,823,489 Net (loss) income (240,843,881 ) (72,428,033 ) 87,814,635 (7,344,391 ) 5,185,865 (350,103,460 ) 295,607,241 (282,112,024 ) Total current assets (3) 987,717,368 220,885,024 111,906,985 7,783,507 161,329,297 718,398,444 (1,864,985,584 ) 343,035,041 Total non-current (3) 833,264,268 385,174,767 160,050,916 1,710,361 43,098,566 1,001,349,312 (783,436,151 ) 1,641,212,039 Total current liabilities 393,129,182 290,128,797 28,995,291 12,648,563 125,341,872 1,564,317,345 (1,862,357,422 ) 552,203,628 Total non-current 2,210,050,053 682,521,743 78,111,581 6,121,684 3,382,236 2,080,349,970 (1,697,084,513 ) 3,363,452,754 Equity (deficit), net (3) (782,197,599 ) (366,590,749 ) 164,851,029 (9,276,379 ) 75,703,755 (1,924,919,559 ) 911,020,200 (1,931,409,302 ) Depreciation and amortization 103,328,661 25,260,746 6,521,380 (323,902 ) 93,193 2,306,932 — 137,187,010 Depreciation of rights of use 352,286 4,858,427 228,929 35,515 1,288,306 665,812 — 7,429,275 Net periodic cost of employee benefits excluding items recognized in other comprehensive income 34,534,805 54,347,829 243,330 (6,361 ) 37,512 27,019,834 — 116,176,949 (1) On July 1, 2019 Pemex Drilling and Services was merged into Pemex Exploration and Production. For comparison purposes all operations for periods prior to the merger are presented in the Pemex Exploration and Production segment. (2) On July 1, 2019 Pemex Ethylene was merged into Pemex Industrial Transformation. For comparison purposes all operations for periods prior to the merger are presented in the Pemex Industrial Transformation segment. (3) See Note 4. For the year ended December 31, 2018 Exploration and Production (1) Industrial Logistics Fertilizers Trading Corporate and Other Operating Subsidiary Intersegment eliminations Total Sales: Trade 482,262,631 973,367,343 — 2,933,424 204,103,954 9,778,796 — 1,672,446,148 Intersegment 400,613,623 143,632,442 63,672,574 65,802 640,382,216 119,762,378 (1,368,129,035 ) — Services income 221,885 559,515 4,708,217 4,742 64,038 3,114,605 — 8,673,002 Reversal (impairment) of wells, pipelines, properties, plant and equipment, net 65,013,616 659,610 (40,288,338 ) (2,246,264 ) (1,719,627 ) — — 21,418,997 Cost of sales 401,629,016 1,107,749,282 42,694,683 4,509,881 837,820,025 54,148,722 (1,249,040,048 ) 1,199,511,561 Gross income (loss) 546,482,739 10,469,628 (14,602,230 ) (3,752,177 ) 5,010,556 78,507,057 (119,088,987 ) 503,026,586 Other income 23,734,616 6,784,333 178,431 81,808 1,703,304 7,683,041 1,352,098 41,517,631 Other expenses (15,057,062 ) (1,263,087 ) (40,248,271 ) (10,389 ) 87,697 (911,091 ) 38,937,083 (18,465,120 ) Distribution, transportation and sales expenses 106,573 26,867,986 82,755 387,397 280,407 94,457 (3,462,366 ) 24,357,209 Administrative expenses 68,953,644 53,474,193 11,592,604 785,883 1,541,092 74,525,804 (76,551,739 ) 134,321,481 Operating income (loss) 486,100,076 (64,351,305 ) (66,347,429 ) (4,854,038 ) 4,980,058 10,658,746 1,214,299 367,400,407 Financing income 94,359,725 7,502,075 1,351,514 4,916 702,471 142,481,311 (214,844,890 ) 31,557,122 Financing cost (4) (131,257,815 ) (1,990,001 ) (220,721 ) (478,044 ) (1,379,583 ) (202,865,030 ) 214,321,510 (123,869,684 ) Derivative financial instruments (cost) income, net (4) (15,989,398 ) (11,304 ) — — 382,568 (3,497,812 ) (5 ) (19,115,951 ) Foreign exchange income (loss), net 28,066,138 (1,736,100 ) 167,982 (2,577 ) 920,488 (3,756,451 ) — 23,659,480 Profit (loss) sharing in joint ventures and associates 54,149 — (1,092 ) — 1,012,490 (124,094,148 ) 124,555,613 1,527,012 Taxes, duties and other 469,262,312 1,446,202 (2,474,189 ) — 1,840,409 (8,496,511 ) — 461,578,223 Net (loss) income (7,929,437 ) (62,032,837 ) (62,575,557 ) (5,329,743 ) 4,778,083 (172,576,873 ) 125,246,527 (180,419,837 ) Depreciation and amortization 126,154,366 20,569,085 4,409,226 (246,697 ) 403,122 2,092,938 — 153,382,040 Net periodic cost of employee benefits excluding items recognized in other comprehensive income 33,715,993 51,247,894 191,132 9,162 (321,683 ) 26,861,666 2,917,450 114,621,614 (1) On July 1, 2019 Pemex Drilling and Services was merged into Pemex Exploration and Production. For comparison purposes all operations for periods prior to the merger are presented in the Pemex Exploration and Production segment. (2) On July 1, 2019 Pemex Ethylene was merged into Pemex Industrial Transformation. For comparison purposes all operations for periods prior to the merger are presented in the Pemex Industrial Transformation segment. (3) Pemex Cogeneration and Services was liquidated on July 27, 2018. Except for certain expenses incurred in the liquidation, all operations were transferred to Pemex Industrial Transformation. For comparison purposes all operations for periods prior to the merger are presented in the Pemex Industrial Transformation segment. (4) See Note 4. Supplemental geographic information – For the years ended December 31, 2020 2019 2018 Domestic sales Ps. 503,712,031 Ps. 807,020,214 Ps. 980,559,538 Export sales: United States 304,344,028 372,134,617 434,838,159 Canada, Central and South America 2,105,703 3,102,066 11,274,714 Europe 45,254,008 131,498,445 158,900,339 Other 93,530,590 79,107,163 86,873,398 Total export sales 445,234,329 585,842,291 691,886,610 Services income* 4,715,484 9,108,680 8,673,002 Total sales Ps. 953,661,844 Ps. 1,401,971,185 Ps. 1,681,119,150 * Services income as of December 31, 2020, 2019 and 2018 represent approximately 97%, 80% and 63%, from domestic PEMEX does not have significant long-lived assets outside of Mexico. Income by product – For the years ended December 31, 2020 2019 2018 Domestic sales Refined petroleum products and derivatives (primarily gasolines) Ps. 409,240,569 Ps. 725,759,040 Ps. 850,342,124 Gas 79,176,837 66,303,063 110,219,691 Petrochemical products 15,294,625 14,958,111 19,997,723 Total domestic sales Ps. 503,712,031 Ps. 807,020,214 Ps. 980,559,538 Export sales Crude oil Ps. 301,199,114 Ps. 408,771,392 Ps. 482,259,045 Refined petroleum products and derivatives (primarily gasolines) 107,391,773 118,495,443 167,796,526 Gas 32,192,334 53,353,075 34,446,277 Petrochemical products 4,451,108 5,222,381 7,384,762 Total export sales Ps. 445,234,329 Ps. 585,842,291 Ps. 691,886,610

Revenue

Revenue	12 Months Ended
	Dec. 31, 2020
Text block [abstract]
Revenue	NOTE 7. REVENUE As of December 31, 2020, 2019 and 2018, the revenues were as follows: A. Revenue disaggregation For the year ended December 31, Exploration (1) Industrial (2)(3) Logistics Fertilizers (4) Trading Corporate and Other Total Geographical market 2020 United States 171,640,991 — — — 131,653,920 1,049,117 304,344,028 Other 85,271,096 — — — 8,259,494 2,124,601 95,655,191 Europe 44,287,027 — — — 966,982 — 45,254,009 Local 327,652 477,920,252 4,099,000 1,516,383 19,135,480 5,409,849 508,408,616 Total 301,526,766 477,920,252 4,099,000 1,516,383 160,015,876 8,583,567 953,661,844 2019 United States 226,689,583 — — — 144,578,641 866,393 372,134,617 Other 57,106,954 — — — 21,001,222 4,101,054 82,209,230 Europe 124,974,855 — — — 6,409,388 1,903,942 133,288,185 Local 761,770 799,255,886 4,663,770 1,635,153 3,587,920 4,434,654 814,339,153 Total 409,533,162 799,255,886 4,663,770 1,635,153 175,577,171 11,306,043 1,401,971,185 2018 United States 276,785,650 — — — 158,713,210 — 435,498,860 Other 51,708,232 — — — 40,743,480 5,660,310 98,112,022 Europe 153,765,163 — — — 4,647,265 2,905,858 161,318,286 Local 225,471 973,926,858 4,708,217 2,938,166 64,037 4,327,233 986,189,982 Total 482,484,516 973,926,858 4,708,217 2,938,166 204,167,992 12,893,401 1,681,119,150 Major products and services 2020 Crude oil 301,199,114 — — — — — 301,199,114 Gas 194,337 60,076,159 — — 51,098,675 — 111,369,171 Refined petroleum products — 409,240,569 — — 107,391,773 — 516,632,342 Other — 8,412,776 — 1,515,464 1,296,288 8,521,205 19,745,733 Services 133,315 190,748 4,099,000 919 229,140 62,362 4,715,484 Total 301,526,766 477,920,252 4,099,000 1,516,383 160,015,876 8,583,567 953,661,844 2019 Crude oil 408,771,392 — — — — — 408,771,392 Gas 288,446 66,014,617 — — 53,353,075 — 119,656,138 Refined petroleum products — 722,239,101 — — 121,028,417 986,965 844,254,483 Other — 8,913,397 — 1,634,300 1,127,697 8,505,098 20,180,492 Services 473,324 2,088,771 4,663,770 853 67,982 1,813,980 9,108,680 Total 409,533,162 799,255,886 4,663,770 1,635,153 175,577,171 11,306,043 1,401,971,185 2018 Crude oil 482,259,045 — — — — — 482,259,045 Gas 3,586 110,216,105 — — 34,446,277 — 144,665,968 Refined petroleum products — 850,342,124 — — 167,796,526 — 1,018,138,650 Other — 12,809,114 — 2,933,424 1,861,151 9,778,796 27,382,485 Services 221,885 559,515 4,708,217 4,742 64,038 3,114,605 8,673,002 Total 482,484,516 973,926,858 4,708,217 2,938,166 204,167,992 12,893,401 1,681,119,150 Timing of revenue recognition 2020 Products transferred at a point in time 301,526,766 477,729,504 4,099,000 1,515,464 159,786,736 8,521,205 953,178,675 Products and services transferred over the time — 190,748 — 919 229,140 62,362 483,169 Total 301,526,766 477,920,252 4,099,000 1,516,383 160,015,876 8,583,567 953,661,844 2019 Products transferred at a point in time 409,059,838 797,167,115 4,663,770 1,634,300 175,509,189 9,492,063 1,397,526,275 Products and services transferred over the time 473,324 2,088,771 — 853 67,982 1,813,980 4,444,910 Total 409,533,162 799,255,886 4,663,770 1,635,153 175,577,171 11,306,043 1,401,971,185 2018 Products transferred at a point in time 482,262,631 973,367,343 4,708,217 2,933,424 204,103,954 9,778,796 1,677,154,365 Products and services transferred over the time 221,885 559,515 — 4,742 64,038 3,114,605 3,964,785 Total 482,484,516 973,926,858 4,708,217 2,938,166 204,167,992 12,893,401 1,681,119,150 (1) On July 1, 2019 Pemex Drilling and Services was merged into Pemex Exploration and Production. For comparison purposes all operations for periods prior to the merger are presented in the Pemex Exploration and Production segment. (2) On July 1, 2019 Pemex Ethylene was merged into Pemex Industrial Transformation. For comparison purposes all operations for periods prior to the merger are presented in the Pemex Industrial Transformation segment. (3) Pemex Cogeneration and Services was liquidated on July 27, 2018. Except for certain expenses incurred in the liquidation, all operations were transferred to Pemex Industrial Transformation. For comparison purposes all operations for periods prior to the merger are presented in the Pemex Industrial Transformation segment. (4) Merged as of January 1, 2021, see Note 28-E. Nature, performance obligations and timing of revenue recognition- Revenue is measured based on the consideration specified in a contract with a customer. PEMEX recognizes revenue when it transfers control over a good or service to a customer. The following table provides information about the nature and timing of the satisfaction of performance obligations in contracts with customers, including significant payment terms and the related revenue. Products / services Nature, performance obligations Timing of revenue recognition Crude oil sales Export sales of crude oil are based on delivery terms established in contracts or orders. All sales are performed by the Free on Board International commercial term (“FOB” Incoterm). Crude oil sale contracts consider possible customers’ claims due to product quality, volume or delays in boarding, which are estimated in the price of the transaction. For orders that have variations in price, revenue is adjusted on the closing date of each period. The subsequent variations in the fair value at the different reporting dates are recognized according to IFRS 9. The price of the product is determined based on a market components formula and the sale of crude oil. Revenue is recognized at a point in time when control of the crude oil has transferred to the customer, which occurs when the product is delivered at the point of shipping. Invoices are generated at that time and are mostly payable within the deadlines established in contracts or orders. Payments in respect of crude oil sold and delivered shall be made within 30 days after the date of the bill of lading therefor. For international market crude oil sales, revenue is recognized with a provisional price, which undergoes subsequent adjustments until the product has arrived at the port of destination. There may be a period of up to 2 months in determining the final sale price, such as in the case of sales to some regions. Revenue is measured initially estimating variables such as quality and volume claims, delays in boarding etc. Sale of petroleum products For all petroleum products, there is only one performance obligation that includes transport and handling services to the point of delivery. The price is determined based on the price at the point of delivery, adding the price of the services rendered (freight, handling of jet fuel, etc.) with the provisions and terms established by the Comisión Reguladora de Energía Revenue is recognized at a point in time when control is transferred to the customer, which occurs either at the point of shipping or when it is delivered at the customer’s facilities. Therefore, transportation fees can be included in the price of sale of the product and are considered part of a single performance obligation since transportation is rendered before control is transferred. Revenue is initially measured by estimating variables such as quality and volume claims, etc. Invoices are usually payable within 30 days. Sales of natural gas There is only one performance obligation that includes transport and handling services to the point of delivery. The transaction price is established at the time of sale, including the estimation of variable considerations such as capacity, penalties, adjustments for quality or volume claims, and incentives for the purchase of products; which are known days after the transaction. Such variable consideration is recognized to the extent that it is probable that it will not be reversed in a future period. Revenue is recognized at a point in time when control is transferred to the customer, which occurs when it is delivered at the customer’s facilities. Therefore, transportation fees can be included in the price of sale of the product and are considered part of a single performance obligation since transportation is rendered before control is transferred. Revenue initially is measured estimating variables as quality and volume claims, etc. Invoices are usually payable within 30 days. Services In cases where within the same service order there are transportation and storage services, there could exist more than one performance obligation, depending on the term of the service. Price is not distributed when there is a performance obligation, except, when there is more than one performance obligation, in which case, the price of the transaction will be assigned according to the service price established in the service order. When there is a performance obligation, the price is not distributed, but if it is considered that there is more than one performance obligation, the price of the transaction is considered based on the prices established in the service orders and which also include penalties such as quality and volume claims. Income is recognized over time as the service is rendered. Invoices are usually payable within 22 days. Other products There is only one performance obligation that includes transportation for delivery to destination. The sale and delivery of the product are made at the same time and because they are FOB, transportation fees are included in the price of sale of the product. The transaction price is established at the time of sale, including the estimation of variable considerations such as capacity, penalties, extraordinary sales not included in contracts, adjustments for quality or volume claims, and incentives for the purchase of products; which are known days after the transaction. The price of the product is estimated on the date of sale and considers variables such as quality and volume claims, etc. Invoices are usually payable within 30 days. B. Accounts receivable in the statement of financial position As of December 31, 2020 and 2019, PEMEX had accounts receivable derived from customer contracts in the amounts of Ps. 68,382,413 and Ps. 89,263,870, respectively (see Note 10). As of December 31, 2020 and 2019, advance of customers was Ps. 8,548,260 and Ps. 6,627,033, respectively. The amount of Ps. 6,627,033 and Ps. 6,154,333 included in advance from customers as of December 31, 2019 and 2018, were recognized as revenue in 2020 and 2019, respectively. C. Practical expedients i. Significant financial component, less than one year PEMEX does not need to adjust the amount committed in consideration for goods and services to account for the effects of a significant financing component, since the transfer and the time of payment of a good or service committed to the customer is less than one year. ii. Practical expedient PEMEX applied the practical expedient, so disclosure about remaining performance obligations that conclude in less than one year is not needed. When PEMEX is entitled to consideration for an amount that directly corresponds to the value of the performance that PEMEX has completed, it may recognize an income from ordinary activities for the amount to which it has the right to invoice. D. COVID-19 Decline in international crude oil prices and other impacts of the Covid-19 On March 6, 2020, the Organization of the Petroleum Exporting Countries (“OPEC”), led by Saudi Arabia, Russia and other groups of petroleum producers, did not come to an agreement to reduce crude oil production in order to support crude oil prices, which resulted in a significant drop in global crude oil prices. On March 11, 2020, the World Health Organization declared the Covid-19 outbreak the Covid-19 pandemic In order to address the drop in crude oil prices that began in March 2020, on April 12, 2020, OPEC and other non-OPEC oil On April 20, 2020, Mexican crude oil experienced an unprecedented drop below U.S. $0.00 to negative U.S. $2.37 per barrel. This drastic drop in price was due to low oil demand as a result of Covid-19 and the lack of oil storage. As of December 31, 2020, the weighted average Mexican crude oil price was U.S. $47.16 per barrel, a decrease of U.S. $10.52 per barrel as compared to the 2019 weighted average Mexican crude oil export price. Any future decline in international crude oil and natural gas prices will have a similar negative impact on PEMEX’s results of operations and financial condition. PEMEX has been affected by these developments and in order to address these adverse effects on its budget results to comply with its budget financial goal established in the approved budget, PEMEX is taking actions to offset the expected decrease in revenue for the year (see Notes 22 and 28). PEMEX prepared its budget for 2020 based on a Mexican crude oil basket price of U.S. $49.00 per barrel and contracted financial derivative instruments to hedge PEMEX’s risk exposure to declines in the price of Mexican crude oil price, when it falls below the average price of U.S. $49.00 per barrel, up to a floor of U.S. $44.00 per barrel (see Note 18). Despite the presence of Covid-19 Decrease in demand for refined products As a result of the Covid-19 pandemic, Secretaría de Salud against Covid-19. Some Primarily as a result of the worldwide economic slowdown and, in particular, the decrease in fuel demand, PEMEX had a 32% decrease in its domestic sales of petroleum products as of December 31, 2020 as compared to 2019.

Financial Instruments

Financial Instruments	12 Months Ended
	Dec. 31, 2020
Text block [abstract]
Financial Instruments	NOTE 8. FINANCIAL INSTRUMENTS A. Accounting classifications and fair values of financial instruments The following tables present information about PEMEX’s carrying amounts and fair values of financial assets and financial liabilities, including their levels in the fair value hierarchy, as of December 31, 2020 and 2019. It does not include fair value information for financial assets and financial liabilities not measured at fair value if the carrying amount is a reasonable approximation of fair value. Additionally, as of December 31, 2020 and 2019, the disclosure of the fair value of lease liabilities is also not required. Carrying amount Fair value hierarchy As of December 31, 2020 FVTPL FVOCI – FVOCI – Financial cost Other financial Total Level 1 Level 2 Level 3 Total Financial assets measured at fair valu e Derivative financial instruments 25,947,993 — — — — 25,947,993 — 25,947,993 — 25,947,993 Equity instruments(i) — — 384,665 — — 384,665 — 384,665 — 384,665 Total 25,947,993 — 384,665 — — 26,332,658 Financial assets not measured at fair value Cash and cash equivalents — — — 39,989,781 — 39,989,781 — — — — Customers — — — 68,382,413 — 68,382,413 — — — — Other non-financing — — — 1,944,413 — 1,944,413 — — — — Officials and employees — — — 3,539,505 — 3,539,505 — — — — Sundry debtors — — — 28,076,118 — 28,076,118 — — — — Investments in joint ventures and associates — — — 12,015,129 — 12,015,129 — — — — Notes receivable — — — 886,827 — 886,827 — — — — Government Bonds — — — 129,549,519 — 129,549,519 129,320,536 — — 129,320,536 Other assets — — — 3,824,923 — 3,824,923 — — — — Total — — — 288,208,618 — 288,208,618 Financial liabilities measured at fair value Derivative financial instruments (9,318,015 ) — — — — (9,318,015 ) — (9,318,015 ) — (9,318,015 ) Total (9,318,015 ) — — — — (9,318,015 ) Financial liabilities not measured at fair value Suppliers — — — — (281,978,041 ) (281,978,041 ) — — — — Accounts and accrued expenses payable — — — — (30,709,497 ) (30,709,497 ) — — — — Leases — — — — (63,184,128 ) (63,184,128 ) — — — — Debt — — — — (2,258,727,317 ) (2,258,727,317 ) — (2,232,694,117 ) — (2,232,694,117 ) Total — — — — (2,634,598,983 ) (2,634,598,983 ) (i) Refers to the participation in TAG Pipelines Sur, S. de R.L. de C.V. Carrying amount Fair value hierarchy As of December 31, 2019 FVTPL FVOCI – FVOCI – Financial Other Total Level 1 Level 2 Level 3 Total Financial assets measured at fair value Derivative financial instruments 11,496,330 — — — — 11,496,330 — 11,496,330 — 11,496,330 Equity instruments (i) — — 346,563 — — 346,563 — 346,563 — 346,563 Total 11,496,330 — 346,563 — — 11,842,893 Financial assets not measured at fair value Cash and cash equivalents — — — 60,621,631 — 60,621,631 — — — — Customers — — — 89,263,870 — 89,263,870 — — — — Officials and employees — — — 3,667,242 — 3,667,242 — — — — Sundry debtors — — — 27,748,849 — 27,748,849 — — — — Investments in joint ventures and associates — — — 14,874,579 — 14,874,579 — — — — Notes receivable — — — 127,475,276 — 127,475,276 — — — — Other assets — — — 3,451,096 — 3,451,096 — — — — Total — — — 327,102,543 — 327,102,543 Financial liabilities measured at fair value Derivative financial instruments (16,650,171 ) — — — — (16,650,171 ) — (16,650,171 ) — (16,650,171 ) Total (16,650,171 ) — — — — (16,650,171 ) Financial liabilities not measured at fair value Suppliers — — — — (208,034,407 ) (208,034,407 ) — — — — Accounts and accrued expenses payable — — — — (26,055,151 ) (26,055,151 ) — — — — Leases — — — — (68,148,627 ) (68,148,627 ) — — — — Debt — — — — (1,983,174,088 ) (1,983,174,088 ) — (2,035,079,540 ) — (2,035,079,540 ) Total — — — — (2,285,412,273 ) (2,285,412,273 ) (i) Refers to the participation in TAG Pipelines Sur, S. de R.L. de C.V. As of December 31, 2020 and 2019, PEMEX has monetary assets and liabilities denominated in foreign currency as indicated below: As of December 31, 2020 Foreign currency Assets Liabilities Net position Exchange Equivalent to U.S. dollar 7,293,404 87,866,609 (80,573,205 ) 19.9487 Ps. (1,607,330,695 ) Euro 2,564 13,501,943 (13,499,379 ) 24.4052 (329,455,044 ) Pounds sterling 30 819,590 (819,560 ) 27.2579 (22,339,485 ) Japanese yen — 110,165,166 (110,165,166 ) 0.1933 (21,294,927 ) Swiss francs — 515,348 (515,348 ) 22.5720 (11,632,435 ) Total Ps. (1,992,052,586 ) As of December 31, 2019 Foreign currency Assets Liabilities Net position /(Liability) Exchange Equivalent to U.S. dollar 11,817,320 76,053,967 (64,236,647 ) 18.8452 Ps. (1,210,552,460 ) Euro 1,974 27,932,908 (27,930,934 ) 21.1537 (590,842,599 ) Pounds sterling 29 1,575,918 (1,575,889 ) 24.9586 (39,331,983 ) Japanese yen — 221,975,145 (221,975,145 ) 0.1734 (38,490,490 ) Swiss francs — 1,666,864 (1,666,864 ) 19.4596 (32,436,507 ) Total Ps. (1,911,654,039 ) Debt is valued and registered at amortized cost and the fair value of debt is estimated using quotes from major market sources which are then adjusted internally using standard market pricing models. As a result of relevant assumptions, the estimated fair value does not necessarily represent the actual terms at which existing transactions could be liquidated or unwound. The information related to “Cash and cash equivalents”, “Customers and other accounts receivable”, “Investments in joint ventures and associates”, “Long-term notes receivable, government bonds and other assets”, “Debt”, “Leases” and “Derivative financial instruments” is described in the following notes, respectively: • Note 9, Cash and cash equivalents. • Note 10, Customers and other financing and non-financing • Note 12, Investments in joint ventures and associates. • Note 15, Long-term notes receivable, government bonds and other assets. • Note 16, Debt. • Note 17, Leases. • Note 18, Derivative financial instruments. B. Fair value hierarchy- PEMEX values the fair value of its financial instruments under standard methodologies commonly applied in the financial markets. PEMEX’s related assumptions and inputs therefore fall under the three Levels of the fair value hierarchy for market participant assumptions, as described below. The fair values determined by Level 1 inputs utilize quoted prices in active markets for identical assets or liabilities. Fair values determined by Level 2 inputs are based on quoted prices for similar assets or liabilities in active markets, and inputs other than quoted prices that are observed for assets or liabilities. Level 3 inputs are unobservable inputs for the assets or liabilities, and include situations where there is little, if any, market activity for the assets or liabilities. Management uses appropriate valuation techniques based on the available inputs to measure the fair values of PEMEX’s applicable financial assets and financial liabilities. When available, PEMEX measures fair value using Level 1 inputs, because they generally provide the most reliable evidence of fair value.

Cash and Cash Equivalents

Cash and Cash Equivalents	12 Months Ended
	Dec. 31, 2020
Text block [abstract]
Cash and Cash Equivalents	NOTE 9. CASH AND CASH EQUIVALENTS As of December 31, 2020 and 2019, cash and cash equivalents were as follows: 2020 2019 Cash on hand and in banks (i) Ps. 20,211,875 Ps. 27,502,675 Highly liquid investments (ii) 19,777,906 33,118,956 Ps. 39,989,781 Ps. 60,621,631 (i) Cash on hand and in banks is primarily composed of cash in banks. (ii) Mainly composed of short-term Mexican Government investments.

Customers and Other Financing a

Customers and Other Financing and Non-Financing Accounts Receivable	12 Months Ended
	Dec. 31, 2020
Text block [abstract]
Customers and Other Financing and Non-Financing Accounts Receivable	NOTE 10. CUSTOMERS AND OTHER FINANCING AND NON-FINANCING As of December 31, 2020 and 2019, accounts receivable and other receivables were as follows: A. Customers 2020 2019 Domestic customers, net Ps. 35,049,717 Ps. 46,792,824 Export customers, net 33,332,696 42,471,046 Total customers Ps. 68,382,413 Ps. 89,263,870 Customers and other accounts receivable are presented separately in the statement of financial position to conform the financial position more clearly. The following table shows a breakdown of accounts receivable based on their credit history at December 31, 2020 and 2019, as well as the relation between the breakdown and the impaired amount: Domestic customers 2020 2019 Current Ps. 34,034,116 Ps. 44,898,986 1 to 30 days 535,938 801,299 31 to 60 days 110,911 302,817 61 to 90 days 19,614 604,025 More than 90 days 1,531,867 1,285,883 Total 36,232,446 47,893,010 Impaired (reserved) (1,182,729 ) (1,100,186 ) Total Ps. 35,049,717 Ps. 46,792,824 Export customers 2020 2019 Current Ps. 30,346,622 Ps. 36,037,725 1 to 30 days 2,925,807 5,895,862 31 to 60 days 73,026 11,120 61 to 90 days 8,063 31,182 More than 90 days 190,541 677,980 Total 33,544,059 42,653,869 Impaired (reserved) (211,363 ) (182,823 ) Total Ps. 33,332,696 Ps. 42,471,046 As of December 31, 2020 and 2019, PEMEX has exposure to credit risk related to accounts receivable, see contractual payment terms in Note 7. Additionally, the reconciliation for impaired accounts receivable is as follows: Domestic customers 2020 2019 Balance at the beginning of the year Ps. (1,100,186 ) Ps. (1,409,014 ) Impairment accounts receivable (82,543 ) 308,828 Balance at the end of the year Ps. (1,182,729 ) Ps. (1,100,186 ) Export customers 2020 2019 Balance at the beginning of the year Ps. (182,823 ) Ps. (321,438 ) Impairment accounts receivable (20,353 ) 111,674 Translation effects (8,187 ) 26,941 Balance at the end of the year Ps. (211,363 ) Ps. (182,823 ) Methodology to determine the estimation of the impairment of the accounts receivable PEMEX allocates each exposure to a credit risk grade based on data that is determined to be predictive of the risk of loss (including but not limited to, audited financial statements, management accounts and cash flow projections and available information about customers) and applying experienced credit judgment. Credit risk grades are defined using qualitative and quantitative factors that are indicative of the risk of default. Exposures within each credit risk grade are segmented by each Subsidiary Entity and its commercial business lines, so the expected credit loss rate is calculated for each segment based on actual credit loss experienced over the past two years. These rates are multiplied by scale factors to reflect differences between the economic conditions during the period over which historical data has been collected, current conditions and PEMEX’s view of economic conditions over the expected lives of the receivables. As of December 31, 2020, the expected percentage of credit loss for accounts receivable for each Subsidiary Entity and Subsidiary Company was: 0.02% for Pemex Fertilizers, 2.42% for Pemex Industrial Transformation, 4.79% for Pemex Corporate, 1.44% for Pemex Logistics, 0.17% for PMI CIM and 0.63% for PMI TRD. As of December 31, 2019, the expected percentage of credit loss for accounts receivable for each Subsidiary Entity and Subsidiary Company was: 1.72% for Pemex Fertilizers, 1.06% for Pemex Industrial Transformation, 1.53% for Corporate, 1.20% for Pemex Logistics, 0.07% for PMI CIM and 0.47% for PMI TRD. The amount of (impairment) of domestic and export customers recognized in the income statement for 2020 and 2019 was Ps. (102,896) and Ps. (447,441), respectively. B. Other financial and non-financial 2020 2019 Financial assets: Sundry debtors (1) Ps. 28,076,118 Ps. 27,748,849 Employees and officers 3,539,505 3,667,242 Total financial assets Ps. 31,615,623 Ps. 31,416,091 Non-financial assets: Taxes to be recovered and prepaid taxes Ps. 55,187,272 Ps. 26,162,225 Special Tax on Production and Services 32,657,743 31,587,018 Advances to suppliers — 565,817 Other accounts receivable 1,944,413 1,510,660 Total non-financial Ps. 89,789,428 Ps. 59,825,720 (1) Includes Ps. (197,215) and Ps. (37,139) of impairment, as of December 31, 2020 and 2019, respectively.

Inventories

Inventories	12 Months Ended
	Dec. 31, 2020
Text block [abstract]
Inventories	NOTE 11. INVENTORIES As of December 31, 2020 and 2019, inventories were as follows: 2020 2019 Refined and petrochemicals products Ps. 32,175,910 Ps. 41,211,837 Crude oil 11,997,570 14,087,218 Materials and products in stock 4,736,659 4,381,628 Products in transit 3,476,807 22,719,635 Gas and condensate products 142,136 144,284 Materials in transit 76,579 127,594 Ps. 52,605,661 Ps. 82,672,196

Investments in Joint Ventures a

Investments in Joint Ventures and Associates	12 Months Ended
	Dec. 31, 2020
Investments Schedule [Abstract]
Investments in Joint Ventures and Associates	NOTE 12. INVESTMENTS IN JOINT VENTURES AND ASSOCIATES The investments in joint ventures and associates as of December 31, 2020 and 2019, were as follows: Percentage of investment December 31, 2020 2019 Deer Park Refining Limited 49. 99 % Ps. 9,635,176 Ps. 12,652,599 Sierrita Gas Pipeline LLC 35. 00 % 1,232,464 1,171,593 Frontera Brownsville, LLC. 50. 00 % 479,520 446,202 Texas Frontera, LLC. 50. 00 % 197,708 199,923 CH 4 Energía, S. A. de C.V. 50. 00 % 141,339 192,614 Administración Portuaria Integral de Dos Bocas, S. A. de C.V. 40. 00 % 208,152 165,370 Other-net Various 120,770 46,278 Ps. 12,015,129 Ps. 14,874,579 Profit (loss) sharing in joint ventures and associates: December 31, 2020 2019 2018 Deer Park Refining Limited Ps. (4,056,037 ) Ps. (1,438,308 ) Ps. 872,885 Sierrita Gas Pipeline LLC 182,805 118,959 124,209 Frontera Brownsville, LLC. 55,738 47,719 59,973 Administración Portuaria Integral de Dos Bocas, S.A. de C.V. 42,782 46,893 54,149 Texas Frontera, LLC. 34,486 47,585 55,316 CH4 Energía S.A. de C.V. 21,224 36,864 15,395 Ductos el Peninsular, S. A. P. I. de C. V. (1,097 ) (17,605 ) (1,092 ) PMV Minera, S.A. de C.V. (i) — — 6,863 Petroquímica Mexicana de Vinilo, S. A. de C. V. (i) — — 352,816 Other, net 179,566 — (13,502 ) (Loss) profit sharing in joint ventures and associates, net Ps. (3,540,533 ) Ps. (1,157,893 ) Ps. 1,527,012 (i) On November 30, 2018, PEMEX received the payment for the sale of its total 44.09% interest in Petroquímica Mexicana de Vinilo, S.A. de C.V. and 44.09% interest in PMV Minera, S.A. de C.V. which were recorded as investments in joint ventures and associates. The sale price was Ps. 3,198,597 and Ps. 53,701, respectively, for a gain of Ps. 689,268 and Ps. 1,646, respectively. The following tables show condensed financial information of major investments recognized under the equity method as of December 31, 2020 and 2019 and for the years ended December 31, 2020, 2019 and 2018: i. Joint venture Condensed statements of financial position Deer Park Refining Limited December 31, 2020 2019 Cash and cash equivalents Ps. 29,504 Ps. 24,536 Other current assets 294,742 1,476,541 Current assets 324,246 1,501,077 Non-current 43,348,665 42,458,405 Total assets 43,672,911 43,959,482 Current financial liabilities 11,617,624 8,008,343 Other current liabilities 523,354 410,524 Current liabilities 12,140,978 8,418,867 Non-current 11,158,305 8,373,280 Other liabilities 1,101,348 1,859,607 Non-current 12,259,653 10,232,887 Total liabilities 24,400,631 18,651,754 Total equity 19,272,280 25,307,728 Total liabilities and equity Ps. 43,672,911 Ps. 43,959,482 Condensed statements of comprehensive income Deer Park Refining Limited December 31, 2020 (1) 2019 (2) 2018 Sales and other income Ps. 8,114,474 Ps. 13,560,847 Ps. 17,519,219 Costs and expenses 10,770,248 11,775,836 11,159,617 Depreciation and amortization 4,776,575 4,088,972 4,094,308 Interest paid 674,504 565,392 503,978 Income tax 6,028 7,551 15,371 Net result Ps. (8,112,881 ) Ps. (2,876,904 ) Ps. 1,745,945 (1) The net loss in 2020, was the result of the economic slowdown and the decline in consumption of refined products caused by Covid-19. (2) 2019 net loss was due to the major maintenance of the Refinery that produced a decrease in the processing of crude oil in refined products. ii. Associates Condensed statements of financial position Sierrita Gas Pipeline, LLC December 31, 2020 2019 Current assets Ps. 186,919 Ps. 331,694 Non-current 3,417,052 3,222,956 Total assets 3,603,971 3,554,650 Current liabilities 82,648 207,241 Total liabilities 82,648 207,241 Total equity 3,521,324 3,347,409 Total liabilities and equity Ps. 3,603,971 Ps. 3,554,650 Condensed statements of comprehensive income Sierrita Gas Pipeline, LLC December 31, 2020 2019 2018 Sales and other income Ps. 942,024 Ps. 669,579 Ps. 615,150 Costs and expenses 419,729 329,695 260,272 Net result Ps. 522,295 Ps. 339,884 Ps. 354,878 Additional information about the significant investments in joint ventures and associates is presented below: • Deer Park Refining Limited (Joint venture) Associates • Sierrita Gas Pipeline LLC. • Frontera Brownsville, LLC • Texas Frontera, LLC • CH4 Energía, S.A. de C.V. • Administración Portuaria Integral de Dos Bocas, S.A. de C.V. • Ductos el Peninsular S.A.P.I. de C.V. • Petroqu í mica Mexicana de Vinilo, S.A. de C.V. • PMV Minera, S.A. de C.V.

Wells, Pipelines, Properties, P

Wells, Pipelines, Properties, Plant and Equipment, Net	12 Months Ended
	Dec. 31, 2020
Text block [abstract]
Wells, Pipelines, Properties, Plant and Equipment, Net	NOTE 13. WELLS, PIPELINES, PROPERTIES, PLANT AND EQUIPMENT, NET Plants Drilling Pipelines Wells Buildings Offshore Furniture and Transportation Construction (1) Land Unproductive Other fixed Total fixed Investment Balances as of January 1, 2019 Ps.811,270,391 20,080,965 421,235,950 1,379,323,723 64,845,163 326,482,265 52,020,042 15,159,952 129,352,513 44,351,625 — 32,659 3,264,155,248 Transfers to rights of use — (7,005,141 ) — — — — — — — — — — (7,005,141 ) Acquisitions 8,337,019 252,382 1,251,488 29,072,723 316,499 5,436,425 184,863 1,735,581 82,520,111 182,563 — — 129,289,654 Reclassifications (1,381,310 ) — 428,738 — (51,885 ) (614,430 ) (234,643 ) 47,110 (106,429 ) (16,161 ) 35,403 — (1,893,607 ) Unsuccessful wells — — — (69,231,587 ) — — — — (7,922,365 ) — — — (77,153,952 ) Capitalization 6,830,064 — 6,538,540 35,251,706 143,312 13,013,199 2,566 955,134 (62,722,409 ) (12,112 ) — — — (Impairment) (21,207,717 ) — (53,718,547 ) (101,683,066 ) (500,745 ) (43,001,652 ) — (2,076,680 ) (2,249,951 ) — — — (224,438,358 ) Reversal of impairment 48,389,246 — 85,500,267 31,086,852 1,023 25,167,135 — 646,603 2,364,078 — — — 193,155,204 Disposals (3,396,366 ) (235,382 ) (301,359 ) (151,405 ) (1,435,140 ) — (1,565,266 ) (112,482 ) (1,310,108 ) (356,379 ) (35,403 ) (32,659 ) (8,931,949 ) Balances as of December 31, 2019 Ps.848,841,327 13,092,824 460,935,077 1,303,668,946 63,318,227 326,482,942 50,407,562 16,355,218 139,925,440 44,149,536 — — 3,267,177,099 Acquisitions 13,934,129 246,351 1,911,502 15,602,539 1,118,794 3,696,726 294,329 552,865 131,963,334 543,472 — — 169,864,041 Reclassifications (1,446,201 ) — 228,056 — 361,131 — 410,240 7,586 (1,234,963 ) 115,107 24,601 — (1,534,443 ) Capitalization 9,906,725 — 19,022,425 42,183,243 616,006 15,695,486 8,835 1,532 (87,150,784 ) (283,468 ) — — — (Impairment) (66,031,126 ) — (9,392,862 ) (48,028,474 ) (65,964 ) (16,210,995 ) — — (20,210,911 ) — — — (159,940,332 ) Reversal of impairment 9,797,281 153,456 11,943,047 73,801,995 1,563,299 25,872,979 8,159 426,560 19,856 — — — 123,586,632 Disposals (3,297,113 ) — (2,855,580 ) — (6,599,754 ) (1,184,109 ) (2,300,115 ) (514,229 ) (1,441,548 ) (298,828 ) (24,601 ) — (18,515,877 ) Balances as of December 31, 2020 Ps.811,705,022 13,492,631 481,791,665 1,387,228,249 60,311,739 354,353,029 48,829,010 16,829,532 161,870,424 44,225,819 — — 3,380,637,120 Accumulated depreciation and amortization Balances as of January 1, 2019 (436,603,123 ) (5,998,481 ) (173,264,040 ) (973,467,746 ) (42,924,256 ) (179,831,090 ) (42,161,378 ) (7,419,050 ) — — — — (1,861,669,164 ) Transfers to rights of use — 943,639 — — — — — — — — — — 943,639 Depreciation and amortization (49,473,592 ) (591,168 ) (16,380,653 ) (51,574,532 ) (2,131,913 ) (13,820,275 ) (2,556,539 ) (658,338 ) — — — — (137,187,010 ) Reclassifications 1,303,186 — 41,225 — 205,661 116,278 220,301 6,956 — — — — 1,893,607 Disposals 3,308,366 128,561 184,172 817 1,226,345 — 1,449,659 92,471 — — — — 6,390,391 Balances as of December 31, 2019 Ps.(481,465,163 ) (5,517,449 ) (189,419,296 ) (1,025,041,461 ) (43,624,163 ) (193,535,087 ) (43,047,957 ) (7,977,961 ) — — — — (1,989,628,537 ) Depreciation and amortization (42,071,837 ) (384,993 ) (14,042,861 ) (56,325,342 ) (1,989,834 ) (11,671,929 ) (2,249,987 ) (895,037 ) — — — — (129,631,820 ) Reclassifications 1,782,525 — (90,590 ) — (103,562 ) — (203,053 ) 149,123 — — — — 1,534,443 Disposals 1,172,277 — 2,576,418 — 5,824,019 968,552 2,164,127 512,922 — — — — 13,218,315 Balances as of December 31, 2020 Ps.(520,582,198 ) (5,902,442 ) (200,976,329 ) (1,081,366,803 ) (39,893,540 ) (204,238,464 ) (43,336,870 ) (8,210,953 ) — — — — (2,104,507,599 ) Wells, pipelines, proper0ties, plant and Ps.367,376,164 7,575,375 271,515,781 278,627,485 19,694,064 132,947,855 7,359,605 8,377,257 139,925,440 44,149,536 — — 1,277,548,562 Wells, pipelines, properties, plant and Ps.291,122,824 7,590,189 280,815,336 305,861,446 20,418,199 150,114,565 5,492,140 8,618,579 161,870,424 44,225,819 — — 1,276,129,521 Depreciation rates 3 to 5 % 5 % 2 to 7 % — 3 to 7 % 4 % 3 to 10 % 4 to 20 % — — — — — Estimated useful lives 20 to 35 20 15 to 45 — 33 to 35 25 3 to 10 5 to 25 — — — — — (1) Mainly wells, pipelines and plants. During 2020, PEMEX detected errors in certain costs and expenses used for the determination of the value in use of certain cash-generating units in the exploration and production segment as of December 31, 2019. This resulted in a different value in use in some cash-generating units and thus, an increase in the value of wells, pipelines, plants and platforms 1 4-B). A. As of December 31, 2020, 2019 and 2018, the financing cost identified with fixed assets in the construction or installation stage, capitalized as part of the value of such fixed assets, was Ps. 3,893,248, Ps. 2,959,025 and Ps. 2,198,191, respectively. Financing cost rates during 2020, 2019 and 2018 were 5.75% to 7.08%, 5.27% to 6.84% and 4.94% to 6.07%, respectively. B. The combined depreciation of fixed assets and amortization of wells for the fiscal years ended December 31, 2020, 2019 and 2018, recognized in operating costs and expenses, was Ps. 129,631,820, Ps. 137,187,010 and Ps. 153,382,040, respectively. These figures include Ps. 101,339,417, Ps. 103,173,593 and Ps. 124,790,099 for oil and gas production assets and costs related to the plugging and abandonment of wells in the amounts of Ps. 2,731,317, Ps. 4,700,151 and Ps. 983,438, for the years ended December 31, 2020, 2019 and 2018, respectively. C. As of December 31, 2020 and 2019, provisions relating to future plugging of wells costs amounted to Ps. 77,125,513 and Ps. 80,849,900, respectively, and are presented in the “Provisions for plugging of wells” (see Note 20). D. As of December 31, 2020, 2019 and 2018, acquisitions of property, plant and equipment include transfers from wells unassigned to a reserve for Ps. 6,229,356, Ps. 5,986,055 and Ps. 6,726,769 respectively (see Note 14) and Ps. 1,072,537 from available-for-sale non-financial E. As of December 31, 2020, 2019 and 2018, the translation effect of property, plant and equipment items from a different currency than the presentation currency was Ps. 490,203, Ps. (1,776,684) and Ps. (238,422), respectively, which was mainly plant. F. At the end of December 2020, PEMEX had impairment impacts mainly due to the long reduction in crude oil prices and the decrease in demand for products, resulting from the Covid-19 As of December 31, 2020, 2019 and 2018, PEMEX recognized a net impairment of Ps. (36,353,700), Ps. (31,283,154) and a net reversal of impairment of Ps. 21,418,997, respectively, which is presented as a separate line item in the consolidated statement of comprehensive income as follows: 2020 2019 2018 (Impairment) Reversal of (Impairment) / (Impairment) Reversal of (Impairment) / (Impairment) Reversal of Reversal of Pemex Industrial Transformation (71,761,571 ) — (71,761,571) (1,275,480 ) 43,519,422 42,243,942 (13,788,470 ) 14,448,080 659,610 Pemex Exploration and Production (1) (31,882,681 ) 66,914,222 35,031,541 (133,523,711 ) 29,487,824 (104,035,887 ) (63,252,635 ) 128,266,251 65,013,616 Pemex Logistics — 426,560 426,560 — 34,119,240 34,119,240 (40,288,338 ) — (40,288,338 ) Pemex Fertilizers (92,444 ) — (92,444) (2,298,775 ) — (2,298,775 ) (2,246,264 ) — (2,246,264 ) PMI Azufre Industrial — 42,214 42,214 (796,263 ) — (796,263 ) — — — PMI NASA — — — (1,162,014 ) 646,603 (515,411 ) (1,719,627 ) — (1,719,627 ) Total (103,736,696 ) 67,382,996 (36,353,700) (139,056,243 ) 107,773,089 (31,283,154 ) (121,295,334 ) 142,714,331 21,418,997 (1) See Note 4 for the correction of error in the impairment of Pemex- Exploration and Production CGUs for 65,799,060. Cash-Generating Units of Pemex Industrial Transformation As of December 31, 2020, 2019 and 2018, Pemex Industrial Transformation recognized a net impairment, a net reversal of impairment and a net reversal of impairment of Ps. (71,761,571), Ps. 42,243,942 and Ps. 659,610, respectively. The net reversal of impairment was in the following CGUs: 2020 2019 2018 Minatitlán Refinery Ps. (37,432,703 ) — — Madero Refinery (18,412,687 ) — (733,307 ) Salamanca Refinery (5,386,525 ) — — Tula Refinery (2,820,750 ) — (5,099,635 ) Cadereita Refinery (2,083,755 ) — Morelos Petrochemical Complex (2,048,039 ) — — New Pemex Gas Processor Complex (1,080,831 ) — — Cangrejera Petrochemical Complex (1,484,489 ) — — Ciudad Pemex Gas Processing Complex (709,127 ) — — Morelos Ethylene Processor Complex (302,665 ) — — Pajaritos Petrochemical Complex — (1,275,480 ) — Salina Cruz Refinery — — (7,955,528 ) Impairment (71,761,571 ) (1,275,480 ) (13,788,470 ) Salina Cruz Refinery Ps. — 13,535,526 — Minatitlán Refinery — 9,391,433 14,448,080 Madero Refinery — 7,721,233 — Morelos Petrochemical Complex — 7,547,233 — Cangrejera Petrochemical Complex — 3,143,924 — Tula Refinery — 2,180,073 — Reversal of impairment — 43,519,422 14,448,080 Net (impairment) reversal of impairment Ps. (71,761,571 ) 42,243,942 659,610 As of December 31, 2020, the impairment of Ps. (71,761,571) was mainly due to (i) lower production levels, mainly at the Madero, Minatitlan and Tula Refineries due to a lower crude oil processing rate than previously projected; (ii) decrease in the price of products; (iii) a decrease in the discount rate of CGUs of refined products and gas by 0.64% and 0.46% respectively, and increase in petrochemicals by 1.15% and ethylene by 0.26%; and (iv) the depreciation of the peso against the U.S. dollar, from a peso/U.S. dollar exchange rate of Ps. 18.8452 = U.S. $1.00 as of December 31, 2019 to Ps. 19.9487 = U.S. $1.00 as of December 31, 2020, which are used as cash flows when U.S. dollars are taken as reference. In 2019, the net reversal of impairment was mainly due to (i) important maintenance plans to recover assets use levels; (ii) a greater supply of light crude oil by Pemex Exploration and Production improving the quality of refined products such as gasoline, turbosines and decreasing residual products such as fuel oil; (iii) an increase in the discount rate of CGUs of refined products, gas, petrochemicals and a decrease in ethylene by 0.03%, 0.09%, 0.06%, and 0.5% respectively, due to the effect of weighting of elements with which the references are determined; and (iv) the appreciation of the peso against the U.S. dollar, from a peso/U.S. dollar exchange rate of Ps. 19.6829 = U.S. $1.00 as of December 31, 2018 to Ps. 18.8452 = U.S. $1.00 as of December 31, 2019, which are used as cash flows when U.S. dollars are taken as reference. In 2018, the net reversal of impairment was mainly due to (i) an increase in processing of refined products due to higher imports of crude oil and humid gas resulting in an increase in income related to transportation fees; (ii) the appreciation of the U.S. dollar against the peso, from a peso/U.S. dollar exchange rate of Ps.19.7867 = U.S. $1.00 as of December 31, 2017 to Ps. 19.6829 = U.S. $1.00 as of December 31, 2018; (iii) a decrease in the discount rate of CGUs of refined products and gas and petrochemicals by 0.1% and 8.1%, respectively; and (iv) an increase in maintenance of the refineries and a decrease in gas production. To determine the value in use of long-lived assets associated with the CGUs of Pemex Industrial Transformation, the net present value of cash flows was determined based on the following assumptions: As of December 31, 2020 2019 2018 2020 2019 2018 2020 2019 2018 2019 Refining Gas Petrochemicals Ethylene** Average crude oil Price 48.89 usd 54.13 usd 53.98 usd N.A. N.A. N.A. Processed volume 920 mbd 723 mbd 680 mbd 2,134 mmpcd of humid gas 2,056 mmpcd of humid gas 2,717mmpcd of humid gas Variable because the load inputs are diverse Rate of U.S. dollar $19.9487 $18.8452 $19.6829 $19.9487 $18.8452 $19.68 19.9487 $18.8452 $19.6829 $18.8452 Useful lives of the cash-generating units (year average) 12 12 14 7 7 8 7 7 7 6 Discount rate 10.83% 11.47% 11.52% 9.76% 10.22% 10.22% 9.76% 8.61% 8. 92% 8.03% Period* 2020-2032 2020-2032 2019-2034 2020-2027 2020-2027 2019-2027 2020-2027 2020-2027 2019-2026 2020-2026 * The first 5 years are projected and stabilize at year 6. ** This entity was merged into Pemex Industrial Transformation on July 1, 2019. CGUs in Pemex Industrial Transformation are processing centers grouped according to their types of processes as refineries, gas complex processors, and petrochemical centers. These centers produce various finished products for direct sale to customers or intermediate products that can be processed in another of its CGUs or by a third party. Each processing center of Pemex Industrial Transformation represents the smallest unit that has distinguishable revenues, with clear costs and expenses that enable future cash flows (value in use) to be determined. Cash flow determinations are made based on PEMEX’s business plans, operating financial programs, forecasts of future prices of products related to the processes of the CGUs, budget programs and various statistical models that consider historical information of processes and the capacity of various processing centers. The recoverable amount of assets is based on each asset’s value in use. The value in use for each asset is calculated based on discounted cash flows, taking into consideration the volumes to be produced and sales to be carried out. As of December 31, 2020, 2019 and 2018, the value in use for the impairment of fixed assets was as follows: 2020 2019 2018 Salamanca Refinery Ps. 44,777,784 — — Cadereyta Refinery 40,793,541 — — Salina Cruz Refinery 30,422,588 — 9,428,152 Minatitlán Refinery 18,819,247 61,673,158 54,846,565 Cangrejera Ethylene Processor Complex 11,493,567 Tula Refinery 34,829,922 40,450,717 39,429,897 Madero Refinery 6,799,072 27,840,687 21,083,328 Morelos Complex (Ethylene) 9,396,765 13,731,548 — Pajaritos Complex (Ethylene) — 1,275,480 — Total value in use Ps. 197,332,486 144,971,590 124,787,942 Cash-Generating Unit of Pemex Exploration and Production As of December 31, 2020, 2019 and 2018, Pemex Exploration and Production recognized a net reversal of impairment, and net impairment and a net reversal of impairment of Ps. 35,031,541, Ps. (104,035,887), and Ps. 65,013,616, respectively. See Note 4 for correction of non-material error in 2019 figures. The net reversal of impairment was in the following CGUs: 2020 2019 2018 Aceite Terciario del Golfo Ps. 29,954,188 — 29,592,864 Cantarell 23,218,889 — 98,673,388 Burgos 9,084,982 7,929,552 — Tsimin Xux 3,920,244 — 627,426 Cuenca de Macuspana 735,919 — — Crudo Ligero Marino — 949,645 — Yaxche — 20,608,627 — Antonio J. Bermúdez — — 6,811,344 Tamaulipas Constituciones — — 140,125 Reversal of impairment 66,914,222 29,487,824 135,845,147 Chuc (11,321,001 ) (25,431,950 ) (6,608,047 ) Antonio J. Bermúdez (9,705,730 ) (3,562,021 ) — Ayín Alux (3,269,173 ) (2,220,696 ) — Tamaulipas Constituciones (2,819,337 ) — — Crudo Ligero Marino (2,213,428 ) — (31,004,065 ) Lakach (1,269,083 ) (56,119 ) (841,718 ) Arenque (803,256 ) — — Ixtal – Manik (481,673 ) (5,047,793 ) — Aceite Terciario del Golfo — (46,284,407 ) — Cantarell — (48,664,886 ) — Tsimin Xux — (1,062,635 ) — Cuenca de Macuspana — (166,013 ) (1,343,836 ) Poza Rica — (1,027,191 ) — Yaxche — — (20,491,627 ) Burgos — — (10,542,238 ) (Impairment) (31,882,681 ) (133,523,711 ) (70,831,531 ) Reversal of impairment (Impairment), net Ps. 35,031,541 (104,035,887 ) 65,013,616 As of December 31, 2020, Pemex Exploration and Production recognized a net reversal of impairment of Ps. 35,031,541 mainly due to: (i) an increase in crude oil prices, generating a positive effect of Ps. 50,763,557 mainly in the Cantarell and Aceite Terciario del Golfo (ATG) CGUs (ii) an increase in the volume of barrels of crude oil equivalent, generating an effect of Ps. 33,784,306 mainly in the ATG, Burgos and Crudo Ligero Marino CGUs. Additionally, there were increases in proven reserves in new fields, including Ixachi, Xikin, Jaatsul, Cheek, Uchbal, Tetl, Teekit, Suuk, Pokche and Mulach; (iii) the positive effect due to an exchange rate of Ps. 21,067,337, mainly in Cantarell, ATG and Burgos CGUs, from Ps. 18.8452 = U.S. $1.00 as of December 31, 2019 to Ps. 19.9487 = U.S. $1.00 as of December 31, 2020; (iv) an increase in taxes of Ps. 3,844,410 was recognized due to a lower income in the production and price profiles as compared to December 31, 2019, impacting Antonio J. Bermúdez, Chuc and Tsimin Xux CGUs, among others. These effects were partially offset by an increase in the discount rate of Ps. 74,428,069, or in percentage terms, from 6.18% in 2019 to 6.23% in 2020, which motivated the CGUs with higher revenues, sales volume, price and exchange rates to recognize this effect. As of December 31, 2019, Pemex Exploration and Production recognized a net impairment of Ps. (104,035,887) mainly due to: (i) a decrease in production profiles volume in the barrel of crude oil equivalent generating a negative effect of Ps. (225,019,093), mainly in the Aceite Terciario del Golfo (“ATG”), Cantarell Chuc and Crudo Ligero Marino CGU. There were increases in the volume production profiles of new fields located in the CGU Yaxche (Xikin, Tetl, Teekit, Suuk, Pokche and Mulach fields) and Cuenca the Veracruz CGU (Ixachi field); however, these effects were only offset by those CGUs that presented a decrease in their production profiles; (ii) a decrease in crude oil and gas prices, generating a negative effect of Ps. (58,110,000) mainly in Cantarell, ATG, Chuc and Tsimin Xux ; (iii) a decrease in exchange rate from Ps. 19.6829 = U.S. $1.00 as of December 31, 2018 to Ps. 18.8452 = U.S. $1.00 of December 31, 2019 resulting in a negative effect of Ps. (15,307,000) mainly in Cantarell, Yaxché, Chuc and Tsimin Xux CGUs; (iv) derived from the application of the Energy Reform in 2013, which defined that the exploratory wells of Round 1.3 will not contribute resources to Pemex Exploration and Production, and for that reason, an impairment of Ps. (9,477,854) was recognized. These effects were offset by (i) an increase in discount rate of Ps. 120,821,000 due to the updating of comparable companies taken as reference to the determination of the discount rate with the same risk profile, mainly in the ATG, Cantarell and Chuc; (ii) a net benefit from lower income in production profile of Ps. 17,258,000, mainly in ATG, Cantarell and Chuc as a result of lower income in their production profiles; and (iii) during 2020 Pemex Exploration and Production carried out an analysis of the distribution of costs used for the determination of the value in use of some of the CGUs, resulting in changes associated with the distribution of costs of internal services, as well as an improvement in the determination of cost-sharing factors, resulting in Ps. 65,799,060 of reversal of impairment. As of December 31, 2018, Pemex Exploration and Production recognized a net reversal of impairment in the amount of Ps. 65,013,616 mainly due to (i) an advance of production in Cantarell for rethinking physical goals for the period from 2024 to 2029 with a recovery of Ps. 98,673,388. This computation was projected using a discount rate of 7.03% and a tax rate of 30% (observable market) on the operating profit with an economic horizon of 25 years, compared to a discount rate of 14.40% that includes the cost of financing and the pyramiding of taxes and observable rights in similar companies, including the Profit-sharing Duty; (ii) application in the fourth quarter of the relevant discount rate and tax rate (observable market), a net benefit was generated in most of the projects with respect to the previous year, mainly in the Aceite Terciario del Golfo project in the amount of Ps. 29,592,863. The foregoing was partially offset by an impairment of Ps. (63,252,635), mainly in (i) the Aguas Someras 2 projects in the amount of Ps. (58,318,030), (ii) the Crudo Ligero Marino projects, mainly due to higher water and salt content in the hydrocarbons reserves, (iii) the Yaxche Project, due to operating impacts in the fields directly related to production, and (iv) the Tsimin Xux and Chuc projects, mainly due to the natural decline of proved hydrocarbon reserves. The CGUs of Pemex Exploration and Production are investment projects in productive fields with hydrocarbon reserves associated with proved reserves. These productive hydrocarbon fields contain varying degrees of heating power consisting of a set of wells and are supported by fixed assets associated directly with production, such as pipelines, production facilities, offshore platforms, specialized equipment and machinery. Each project represents the smallest unit which can concentrate the core revenues, with clear costs and expenses that enable future cash flows (value in use) to be determined. Pemex Exploration and Production determines the recoverable amount of fixed assets based on the long-term estimated prices for Pemex Exploration and Production’s proved reserves. The recoverable amount on each asset is the value in use. To determine the value in use of long-lived assets associated to hydrocarbon extraction, the net present value of reserves is determined based on the following assumptions: 2020 2019 2018 Average crude oil price 52.96 USD/bl 48.69 USD/bl 58.02 USD/bl Average gas price 5.21 USD/mpc 5.07 USD/mpc 4.89 USD/mpc Average condensates price 61.09 USD/bl 57.67 USD/bl 43.21 USD/bl Discount rate 6.23% annual 6.18% annual 7.03% annual For 2020, 2019 and 2018 the total forecast production, calculated with a horizon of 25 years was 6,731 million, 7,123 million and 6,192 million barrels per day of crude oil equivalent, respectively. Pemex Exploration and Production, in compliance with practices observed in the industry, estimates the recovery value of an asset by determining its value in use, based on cash flows associated with proved reserves after taxes and using a discount rate, also after taxes. Cash flows related to plugging wells provision costs are excluded in this computation of discounted cash flows. As of December 31, 2020, 2019 and 2018, values in use for CGU with impairment or reversal of impairment are: 2020 2019 2018 Cantarell Ps. 125,953,979 101,446,620 157,526,000 Chuc 63,880,611 72,301,156 97,970,000 Aceite Terciario del Golfo 39,947,448 12,667,016 80,713,000 Tsimin Xux 25,910,556 28,116,300 38,152,000 Crudo Ligero Marino 24,233,795 18,935,146 23,540,000 Antonio J. Bermúdez 24,027,588 39,195,252 — Burgos 17,487,412 10,731,645 2,124,000 Ixtal – Manik 12,647,284 19,024,166 — Ayín Alux 6,213,753 2,705,441 — Tamaulipas Constituciones 5,416,487 — — Arenque 4,908,009 — — Cuenca de Macuspana 1,096,972 432,365 680,000 Lakach (169,119 ) (2,426,036 ) (1,658,000 ) Yaxche — 93,677,507 516,000 Poza Rica — 15,029,941 — Total Ps. 351,554,775 411,836,519 399,563,000 Cash-Generating Units of Pemex Logistics As of December 31, 2020, 2019 and 2018, Pemex Logistics recognized a reversal of impairment and impairment for Ps. 426,560, Ps. 34,119,240 and Ps. (40,288,338), respectively. The net reversal of impairment and impairment were in the following CGUs: 2020 2019 2018 Vessel Ps. 303,516 — — Land transport (white pipelines) 123,044 — — Pipelines — 34,119,240 — Reversal of impairment 426,560 34,119,240 — Pipelines — — (40,288,338 ) (Impairment) — — (40,288,388 ) Reversal (impairment) net Ps. 426,560 34,119,240 (40,288,388 ) As of December 31, 2020 2019 2018 2020 2019 2018 2020 2019 2018 Pipelines Landing transport Vessel Discount rate 11.97 % 11.94 % 13.55 % 11.97 % 11.94 % 13.55 % 11.97 % 11.94 % 13.55 % Useful life 22 23 26 5 5 6 19 19 21 As of December 31, 2020, Pemex Logistics recognized a reversal of impairment in land transport and vessel CGUs for Ps. 426,560, mainly due to an increase in projected cash inflows. The recoverable amount of assets is based on each asset’s value in use. As of December 31, 2019, Pemex Logistics recognized a reversal of impairment in the CGU of pipelines for Ps. 34,119,240 mainly due to (i) a decrease in the projected cost of losses from fuels subtraction from Ps. 39,388,055 as of December 31, 2018 to Ps. 4,644,846 as of December 31, 2019, which led to an improvement in future cash flows. Furthermore, the CRE established a mechanism that allowed Pemex Logistics to recover, through the pipeline transportation fee, a significant amount of the losses derived from fuel subtraction. Finally, a decrease in the discount rate from 13.55% at the end of 2018 to 11.94% at the end of 2019 due to the differences in curves used in reference rates between Mexican pesos and U.S. dollars. As of December 31, 2018, Pemex Logistics recognized an impairment in the CGU of pipelines for Ps. (40,288,338), mainly due to a decrease in projected cash inflows of 46%, from an annual average of Ps. 47,219,903 at the end of 2017 to Ps. 25,271,404 at the end of 2018, in addition to an increase in the cost of losses from fuels subtraction of 40%. This increase was partially offset by a decrease in direct operating costs of 58%, from annual average costs at the end of 2017 of Ps. 16,485,969 to Ps. 6,880,967 at the end of December 2018, as well as a decrease in the discount rate, from 15.41% at the end of 2017 to 13.55% at the end of 2018. CGU in Pemex Logistics are pipelines and transport equipment. The recoverable amounts of the assets as of December 31, 2019 and 2018, corresponding to the discounted cash flows at the rate of 11.97%, 11.94% and 13.55%, respectively, as follows: 2020 2019 2018 TAD, TDGL, TOMS (Storage terminals) Ps. 95,169,597 Ps. 147,249,859 Ps. 92,772,003 Pipelines 88,740,662 105,319,693 — Primary logistics 108,036,325 73,821,371 111,941,265 Land Transport (white pipes) — — 445,377 Total Ps. 291,946,584 Ps. 326,390,923 Ps. 205,158,645 Cash-Generating Units of Pemex Fertilizers CGU is a plant used in the ammonia process. The recoverable amount of assets is based on each asset’s value in use. To determine cash flows, volumes to be produced and sales to be carried out were taken into consideration. Discount rate The discount rates used as of December 31, 2020, 2019 and 2018 were 9.51%, 10.15% and 8.92%, respectively, due to the updating of comparable companies taken as reference to the determination of the discount rate. As of December 31, 2020, 2019 and 2018, Pemex Fertilizers recognized an impairment of Ps. (92,444), Ps. (2,298,775) and Ps. (2,246,264), respectively in CGUs mentioned above. The impairment was mainly caused from (i) the decrease in projected production due to the lack of raw material, (ii) increase in raw material prices, and (iii) decrease in ammonia prices. As of December 31, 2020 2019 2018 Plant Exchange rate 19.9487 18.8452 19.6829 Discount rate 9.51 % 10.15 % 8.92 % Useful life 22 23 26 Cash-Generating Unit of Pemex Azufre Industrial (PMI AZIND) PMI AZIND, a 99% subsidiary of MGAS, has, as a principal asset, a sulfur solidifying plant, located in the maritime sulfur storage terminal in the integral port administration of Coatzacoalcos, Veracruz; this plant is considered the CGU of this company. As of December 31, 2020, PMI AZIND recognized a net reversal of impairment of Ps. 42,214, due to an appraisal on the sulfur solidifying plant which resulted in an increase of its value. As of December 31, 2019, PMI AZIND recognized an impairment of Ps. (796,263), due to an appraisal on the sulfur solidifying plant which resulted in a decrease of its value. The recoverable amount is the fair value less costs of disposition. As of December 31, 2020 and 2019, the recoverable amounts were Ps. 528,577 and Ps. 513,882, respectively. The estimated useful life was 9 years in 2020 and 10 years in 2019. Cash-Generating Units of PMI NASA As of December 31, 2020, PMI NASA did not recognize any impairment change. Cash-Generating Unit are flotating hotels (“Flotels”) “Reforma Pemex” and “Cerro de la Pez” which provide food and hospitality services. As of December 31, 2019, PMI NASA recognized an impairment of Ps. (515,411), due to (i) an impairment in the Flotel Reforma Pemex of Ps. (1,146,278) as a result of rate adjustments; and (ii) a reversal of impairment of Ps. 630,866 in the Cerro de la Pez Flotel, as a consequence of the recovery in the development of projects. The cash flow methodology was used to determine the value in use of the flotels, applying discount rates of 15.81% and 16.94% with an average useful life of 17 years. The recoverable amount of the flotels is the value in use which amounted Ps. 3,747,142. As of December 31, 2018, PMI NASA recognized an impairment of Ps. (1,719,627), due to the disuse of the Cerro de la Pez Flotel, as a consequence of the reduction in the development of projects in recent months. This impairment was calculated by comparing the amount that would have been required to acquire a flotel with similar characteristics to the replacement cost of a similar flotel constructed by a specialized company. The replacement cost as of December 31, 2018 was Ps. 1,476,218. G. As of December 31, 2019, drilling equipment that was acquired through capital lease arrangements were classified as rights of use that amounted to Ps. 6,223,655 (see Note 17). H. PEMEX can conduct exploration and extraction activities through Exploration and Extraction Contracts (“EECs”). The EECs are awarded individually, through associations or joint ventures based on guidelines approved by the Comisión Nacional de Hidrocarburos a. Production-sharing contracts; b. Profit-sharing contracts; c. License agreements; and d. Service contracts. Certain of the EECs are operated though joint arrangements, for which PEMEX recognizes in its financial statements both the rights to the assets and the obligations for the liabilities, as well as profits and losses relating to the arrangements. EECs as of December 31, 2020 are: a. Production-sharing contracts: The object of the production-sharing contracts is the execution of oil activities under shared production contracts among Mexico through the Mexican Government via the CNH and Pemex Exploration and Production (as contractor), for the contractual area and the sharing of costs, risks, and terms and conditions involved in the contract and in accordance with the applicable regulations and best practices of the industry receiving, in exchange, benefits in favor of the contractor. I. Production contracts without a partner • Hydrocarbons Exploration and Extraction Contract for Block 29, Cuenca del Sureste, in which Pemex Exploration and Production owns 100% of the project. • Hydrocarbon Extraction Contract for the Ek-Balam II. Production contracts in consortium • Exploration and Extraction Contract related to Block 2 Tampico Misantla, pursuant to a consortium formed by Pemex Exploration and Production and Deutsche Erdoel AG (“DEA”) and Compañía Española de Petróleos, S. A. U., (jointly liable). The object of the contract is the realization of oil activities, under shared production contracts, by the contractor for the contractual area and the sharing of costs, risks, terms and conditions involved in the contract and in accordance with the applicable regulations and best practices of the industry, receiving in exchange, benefits in favor of the contractor. Pemex Exploration and Production and DEA each have a 50% interest in this contractual area. Pemex Exploration and Production is the operator under this contract. • Exploration and Extraction Contract, related to Block 8 Cuencas del Sureste, pursuant to a consortium formed by Pemex Exploration and Production, EPC Hidrocarburos México, S. A. de C. V. (EPC). and Ecopetrol Global Energy, S. L. U. (jointly liable). Pemex Exploration and Production was designated by all the participating companies and with the approval of the CNH as the operator of this contract and all operational aspects of the petroleum activities will be carried out only by the operator on behalf of all participating companies. Pemex Exploration and Production and EPC each have a 50% interest in this contractual area. • Exploration and Extraction Contract, related to Block 16, Tampico Misantla, pursuant to a consortium by Pemex Exploration and Production, Deutsche Erdoel México S. de R.L. de C.V. (as operator) and CEPSA E.P. México S. de R.L. de C.V., as jointly liable. Pemex Exploration and Production owns 40% of this contractual area, DEUTSCHE Erdoel México S. de R.L. de C.V. owns 40%, and CEPSA E.P. México S. de R.L. de C.V. owns 20%. • Exploration and Extraction Contract, related to Block 17, Tampico Misantla, pursuant to a consortium by Pemex Exploration and Production, Deutsche Erdoel México S. de R.L. de C.V. (as operator) and CEPSA E.P. México S. de R.L. de C.V., as jointly liable. Pemex Exploration and Production owns

Intangible Assets, Net

Intangible Assets, Net	12 Months Ended
	Dec. 31, 2020
Text block [abstract]
Intangible Assets, Net	NOTE 14. INTANGIBLE ASSETS, NET At December 31, 2020 and 2019, intangible assets, net are mainly wells unassigned to a reserve and other components of intangible assets, which amounted to Ps. 22,775,784 and Ps.14,584,524, respectively as follows: A. Wells unassigned to a reserve 2020 2019 Wells unassigned to a reserve: Balance at the beginning of period Ps. 12,831,281 Ps. 9,779,239 Additions to construction in progress 23,237,519 17,028,974 Transfers against expenses (8,404,284 ) (7,990,877 ) Transfers against fixed assets (6,229,356 ) (5,986,055 ) Balance at the end of period Ps. 21,435,160 Ps. 12,831,281 In addition, as of December 31, 2020 and 2019, PEMEX recognized expenses related to unsuccessful wells of Ps. 19,351,986 and Ps. 79,595,185, respectively, directly in its statement of comprehensive income. B. Other intangible assets As of December 31, 2020 Licenses Exploration expenses, Total Cost Balance at the beginning of the year Ps. 4,593,100 2,174,063 6,767,163 Additions 375,801 27,785 403,586 Disposals (139,663 ) (527,489 ) (667,152 ) Effects of foreign exchange 56,067 94,741 150,808 Ps. 4,885,305 1,769,100 6,654,405 Amortization accumulated Balance at the beginning of the year Ps. (4,232,303 ) (781,617 ) (5,013,920 ) Disposals 138,099 132,935 271,034 Amortization (441,229 ) (37,759 ) (478,988 ) Effects of foreign exchange (56,681 ) (35,226 ) (91,907 ) (4,592,114 ) (721,667 ) (5,313,781 ) Balance at the end of the year Ps. 293,191 1,047,433 1,340,624 Useful lives 1 to 3 years Up to 36 years As of December 31, 2019 Licenses Exploration expenses, Total Cost Balance at the beginning of the year 4,391,069 2,255,551 Ps. 6,646,620 Additions 201,853 28,850 230,703 Effects of foreign exchange (13,436 ) (96,724 ) (110,160 ) 4,579,486 2,187,677 6,767,163 Amortization accumulated Balance at the beginning of the year (3,871,442 ) (743,865 ) Ps. (4,615,307 ) Amortization (386,414 ) (70,617 ) (457,031 ) Effects of foreign exchange 25,553 32,865 58,418 (4,232,303 ) (781,617 ) (5,013,920 ) Balance at the end of the year 347,183 1,406,060 Ps. 1,753,243 Useful lives 1 to 3 years Up to 36 years

Long-Term Notes Receivable, Gov

Long-Term Notes Receivable, Government Bonds And Other Assets	12 Months Ended
	Dec. 31, 2020
Text block [abstract]
Long-Term Notes Receivable, Government Bonds And Other Assets	NOTE 15. LONG-TERM NOTES RECEIVABLE, GOVERNMENT BONDS AND OTHER ASSETS As of December 31, 2020 and 2019, the balance of long-term notes receivable was as follows: A. Long-term notes receivable 2020 2019 Promissory notes issued by the Mexican Government Ps. — Ps. 121,624,852 Other long-term notes receivable (1) 886,827 940,454 Total long-term notes receivable Ps. 886,827 Ps. 122,565,306 (1) Mainly collection rights related to Value Added Tax from the non-recourse Promissory notes issued by the Mexican Government 2020 2019 Total promissory notes issued by the Mexican Government Ps. — Ps. 126,534,822 Less: current portion of notes receivable issued by the Mexican Government, net of expected credit losses (2) — 4,909,970 Long-term promissory notes Ps. — Ps. 121,624,852 (2) The amount reflects the principal and interest from promissory note 4 in 2019 matured on March 31, 2020. On December 24, 2015, the SHCP published in the Official Gazette of the Federation the Disposiciones de carácter general relativas a la asunción por parte del Gobierno Federal de obligaciones de pago de pensiones y jubilaciones a cargo de Petróleos Mexicanos y sus empresas productivas subsidiarias In accordance with these provisions and prior to the completion of the independent expert’s review described above, on December 24, 2015, the Mexican Government issued in advance payment, through the SHCP, a Ps. 50,000,000 non-negotiable non-current On August 5, 2016, Petróleos Mexicanos received promissory notes issued by the Mexican Government at a discount value of Ps. 184,230,586 as of June 29, 2016, as part of the Mexican Government’s assumption of a portion of the payment liabilities related to Petróleos Mexicanos and Subsidiary Entities’ pensions and retirement plans, which notes were delivered in exchange for the Ps. 50,000,000 promissory notes issued to Petróleos Mexicanos on December 24, 2015. On August 15, 2016, Petróleos Mexicanos exchanged Ps. 47,000,000 of these promissory notes for short-term floating rate Mexican Government debt securities, known as Bonos de Desarrollo del Gobierno Federal Petróleos Mexicanos recognized a Ps. 135,439,612 increase in equity as a result of the Ps. 184,230,586 of the promissory notes as of June 29, 2016, minus the Ps. 50,000,000 promissory note received by Petróleos Mexicanos on December 24, 2015, plus a Ps. 1,209,026 increase in the value of the promissory notes from June 29, 2016 to August 15, 2016, the date on which PEMEX received the promissory notes. As of December 31, 2019, PEMEX held promissory notes with a discounted value of Ps. 126,534,822. These promissory notes had annual maturity dates ranging from 2020 to 2036 and yielding rates ranging from 5.39% to 7.00%, as follows: As of December 31, 2019 Number of Promissory Notes Maturity Yield Rate Range Principal Amount 1 2020 5.39% Ps. 4,909,970 (1) 1 2021 5.57% 5,846,979 1 2022 5.74% 6,500,329 1 2023 5.88% 7,112,804 1 2024 5.99% 7,534,758 5 2025 to 2029 6.06% to 6.62% 40,018,603 5 2030 to 2034 6.70% to 6.90% 39,692,547 2 2035 to 2036 6.95% to 7.00% 14,918,832 Total promissory notes Ps. 126,534,822 Less: current portion 4,909,970 Long-term notes Ps. 121,624,852 (1) The amount of the promissory note is Ps. 4,917,970, less an impairment of Ps. 8,000. From January 1 to November 19, 2020 PEMEX recognized Ps. 7,097,040 in interest from these promissory notes. This amount was recognized as financing income in the consolidated statement of comprehensive income. Yield rates for these promissory notes were fixed all throughout their lifespans and up to their maturities. As of December 31, 2019, as part of the Mexican Government’s strategy to finance PEMEX, Petróleos Mexicanos received the prepayment of 7 promissory notes (one maturing in 2019 and 6 in anticipated form) in the amount of Ps. 38,705,497 (Ps. 32,493,666 of principal and Ps. 6,211,831 of interest), which was transferred to the Fideicomiso Fondo Laboral Pemex On March 31, 2020, Petróleos Mexicanos received the payment of promissory note No. 4 in the amount of Ps. 4,983,670 (Ps. 4,102,622 of principal and Ps. 881,048 of interest), which was transferred to the FOLAPE. On November 19, 2020, Petróleos Mexicanos and the SHCP agreed to exchange 16 promissory notes in favor of Petróleos Mexicanos (notes 5 to 20) in a total amount of Ps. 128,656,192 for 18 series of Mexican Government local bonds (the “Government Bonds”). The resources from the Government Bonds will be exclusively transferred to the FOLAPE for the payments related to its pension and retirement plan obligations. The roll-forward related to the promissory notes is as follows: December 31, 2020 (i) 2019 Balance at the beginning of the year Ps. 126,534,822 156,981,745 Long-term receivable from the Mexican Government (4,102,622 ) (32,493,666 ) Accrued interests 7,097,040 8,266,574 Interests received from promissory notes (881,048 ) (6,211,831 ) Reversal of (impairment) of the promissory notes 8,000 (8,000 ) Exchange from promissory notes to Bonds (128,656,192 ) — Balance at the end of the year Ps. — 126,534,822 (i) Until November 19, 2020. B. Government bonds As of December 31, 2020, the balance of Government Bonds (see Note 15-A), 2020 Government bonds Ps. 129,549,519 Less: current portion of Government Bonds, net of expected credit losses (1) 18,036,557 Total long-term notes receivable Ps. 111,512,962 (1) Includes an expected credit loss of Ps. 17,581. As of November 19, 2020, the value of the Government Bonds was Ps. 128,786,611, and the liability was Ps. 95,597,610. On November 20, 2020, Petróleos Mexicanos monetized the whole of the Government Bonds by entering into a three-year financial arrangement to partially raise an equivalent of Ps. 95,597,610 at an annual rate of 8.56275%, maturing November 24, 2023. Petróleos Mexicanos retains the risks, benefits and economic rights of the Government Bonds, which were delivered to a financial institution. Petróleos Mexicanos will continue to collect coupon and principal payments from the securities throughout the term of the transaction. Therefore, Petróleos Mexicanos recognizes these Government Bonds as restricted assets and recognizes short-term debt for the monetization. The resources from the Government Bonds will be transferred to the FOLAPE for payments related to its pension and retirement plan obligations. Income interest generated by the Government Bonds amounted Ps. 2,103,099 during 2020, which were recognized as financial income in the consolidated statement of comprehensive income and of which Petróleos Mexicanos received the payment of Ps. 817,270. The Government Bonds consist of 18 series of development bonds (D Bonds, M Bonds and UDI Bonds) issued by the SHCP with maturities between 2021 and 2026, with a notional amount of Ps. 118,280,727 and Ps. 913,482 in UDIs. As of December 31, 2020, the fair value of the transferred assets is Ps. 129,320,536, and the fair value of the associated liabilities is Ps. 95,630,214, resulting in a net position of Ps. 33,690,322. As of December 31, 2020, the recorded liability is Ps 95,597,610 (see Note 16). The roll-forward of the Mexican Bonds is as follows: 2020 Promissory notes value at the beginning of the exchange as of November 19, 2020 Ps. 128,656,192 Financial income from the Exchange of promissory notes to Bonds 130,419 Initial value of Mexican Bonds as of November 19, 2020 128,786,611 Accrued interests 2,103,099 Interests received from bonds (817,270 ) Impact of the valuation of bonds in UDIS (505,339 ) (Impairment) of bonds (17,582 ) Balance at the end of the year Ps. 129,549,519 C. Other assets At December 31, 2020 and 2019, the balance of other assets was as follows: December 31, 2020 2019 Payments in advance Ps. 5,223,679 2,650,251 Other (1) 1,680,934 1,518,801 Insurance 678,897 484,955 Total other assets Ps. 7,583,510 4,654,007 (1) Includes restricted cash for Ps. 50,661 as of December 31, 2020, as a result of a cash retention ordered by the court in a commercial judgement promoted by OPCO Soluciones, S.A. de C.V. against PEMEX’s subsidiary company AGRO, due to lack of payment by this subsidiary company.

Debt

Debt	12 Months Ended
	Dec. 31, 2020
Text block [abstract]
Debt	NOTE 16. DEBT The Ley de Ingresos de la Federaci ó n The Board of Directors approves the global financing proposal of public debt of Petróleos Mexicanos in order to incorporate it into the Federal Income Law for the fiscal year 2020, in accordance with the Petróleos Mexicanos Law and the Reglamento de la Ley de Petróleos Mexicanos During the period from January 1 to December 31, 2020, PEMEX participated in the following financing activities: • On January 21, 2020 Petróleos Mexicanos increased its Medium-Term Notes Program from U.S. $102,000,000 to U.S. $112,000,000. • On January 28, 2020, Petróleos Mexicanos issued U.S. $5,000,000 of debt securities under its U.S. $112,000,000 Medium-Term Notes Program, Series C, in two tranches: • (1) U.S. $2,500,000 5.950% Notes due 2031 • (2) U.S. $2,500,000 6.950% Notes due 2060 All debt securities under this program are jointly and severally guaranteed by Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics and their respective successors and assignees. • On January 30, 2020, Petróleos Mexicanos repurchased a total of U.S. $61,992 notes due 2020. • On February 6, 2020, Petróleos Mexicanos consummated the early settlement of its waterfall exchange offer pursuant to which it exchanged: A) a total of U.S. $1,252,303 of notes and bonds with maturity dates between 2021 and 2026 as follows: • (1) U.S. $264,752 aggregate principal amount of its outstanding 5.500% Notes due 2021, • (2) U.S. $171,662 aggregate principal amount of its outstanding 6.375% Bonds due 2021, • (3) U.S. $148,535 aggregate principal amount of its outstanding 4.875% Notes due 2022, • (4) U.S. $63,854 aggregate principal amount of its outstanding Floating Rate Notes due 2022, • (5) U.S. $157,487 aggregate principal amount of its outstanding 5.375% Notes due 2022, • (6) U.S. $216,727 aggregate principal amount of its outstanding 3.500% Notes due 2023, • (7) U.S. $117,333 aggregate principal amount of its outstanding 4.625% Notes due 2023 and • (8) U.S. $111,953 aggregate principal amount of its outstanding 4.500 % Notes due 2026, for U.S. $1,300,000 aggregate principal amount of its new 5.950% Notes due 2031. B) a total of U.S. $1,374,426 of notes and bonds with maturity dates between 2044 and 2048 as follows: • (1) U.S. $179,332 aggregate principal amount of its outstanding 5.500% Notes due 2044, • (2) U.S. $750,969 aggregate principal amount of its outstanding 5.625% Bonds due 2046 and • (3) U.S. $444,125 aggregate principal amount of its outstanding 6.350% Notes due 2048, for U.S. $1,300,000 aggregate principal amount of its new 6.950% Bonds due 2060. The 5.950% Notes due 2031 and 6.950% Bonds due 2060 are jointly and severally guaranteed by Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics and their respective successors and assignees and represent reopenings of the 5.950% Notes due 2031 and 6.950% Bonds due 2060, respectively, originally issued on January 29, 2020. • On May 26, 2020, Petróleos Mexicanos partially renewed a credit line of U.S. $400,000 maturing on May 2020 for U.S. $200,000 maturing in 2021 linked to three-month LIBOR plus 350 basis points. • On August 24, 2020, Petróleos Mexicanos entered into a U.S. $150,000 term loan due August 2022, which bears interest at a floating rate linked to three-month LIBOR plus 425 basis points. • On October 16, 2020, Petróleos Mexicanos issued U.S. $1,500,000 of its 6.875% Notes due October 2025 under its U.S. $112,000,000 Medium Term Notes Program, Series C. • On November 20, 2020, Petróleos Mexicanos monetized the Government Bonds by entering into a three-year financial arrangement to raise Ps. 95,597,610 at a rate of 8.56275% per annum, with a maturity of November 24, 2023. Petróleos Mexicanos retains the economic rights of the New Government Bonds, accordingly Petróleos Mexicanos accounts for them as restricted assets and recognizes debt for this transaction. (See Note 15-B) • On December 7, 2020, PMI Trading, as borrower, and Petróleos Mexicanos, as guarantor, entered into a U.S. $1,500,000 revolving credit facility maturing in 2023, which bears interest at a floating rate linked to LIBOR plus 300 to 475 basis points. • On December 15, 2020, PEMEX implemented a financial factoring transaction to support its suppliers for an amount of Ps. 4,067,650 for 180 days at the Tasa de Interés Interbancaria de Equilibrio Petróleos Mexicanos renewed and restructured one of its liquidity management lines for which it entered into a new revolving credit contract with a banking union. This new line was made available to PMI Trading, with Petróleos Mexicanos’ corporate guarantee to meet its financial needs and strengthen PEMEX’s liquidity. As of December 31, 2020, Petróleos Mexicanos and PMI Trading (previously managed by HHS) had U.S. $7,700,000 and Ps. 37,000,000 in available credit lines in order to provide liquidity, of which U.S. $1,900,000 and Ps. 37,000,000 are available. All of the financing activities mentioned above were guaranteed by Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics and their respective sucessors and assignees. On December 1, 2020, credit lines operated by HHS were transferred to PMI Trading. From January 1 to December 31, 2020, PMI Trading obtained U.S. $28,489,000 from its revolving credit line and repaid U.S. $27,657,935. As of December 31, 2019, the outstanding amount under this revolving credit line was U.S. $1,556,000. As of December 31, 2020, the outstanding amount under this revolving credit line was U.S. $2,387,065. The Federal Income Law applicable to PEMEX as of January 1, 2019, published in the Official Gazette of the Federation on December 28, 2018, authorized Petróleos Mexicanos and its Subsidiary Entities to incur an internal net debt up to Ps. 4,350,000 and an external net debt up to U.S. $5,422,500. PEMEX can incur additional internal or external debt, as long as the total amount of net debt (Ps. 112,000,000 equivalent to U.S. $5,640,000) does not exceed the ceiling established by the Federal Income Law. The Board of Directors approves the global financing proposal of public debt of Petróleos Mexicanos in order to incorporate it into the Federal Income Law for the fiscal year 2019, in accordance with the Petróleos Mexicanos Law and the Reglamento de la Ley de Petróleos Mexicanos (Regulations to the Petróleos Mexicanos Law). During the period from January 1 to December 31, 2019, PEMEX participated in the following financing activities: • On June 28, 2019, Petróleos Mexicanos entered into a U.S. $5,500,000 revolving credit facility due 2024 and a U.S. $2,500,000 term loan facility due 2024. • On July 29, 2019, Petróleos Mexicanos entered into a credit line by Export Credit Agency in the amount of U.S. $206,901 which bears interest at a rate linked to six-month • From September to October 2019, Petróleos Mexicanos conducted financing and liability management transactions pursuant to which • On September 23, 2019, Petróleos Mexicanos issued the following debt securities under its U.S. $102,000,000 Medium-Term Notes Program, Series C: (1) U.S. $1,250,000 6.490% Notes due 2027; (2) U.S. $3,250,000 6.840% Notes due 2030; and (3) U.S. $3,000,000 7.690% Bonds due 2050. All debt securities under this program are jointly and severally guaranteed by Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics and their respective successors and assignees. • On September 23, 2019, Petróleos Mexicanos consummated a tender offer pursuant to which it purchased (1) U.S. $491,803 aggregate principal amount of its outstanding 6.000% Notes due 2020; (2) U.S. $242,511 aggregate principal amount of its outstanding 3.500% Notes due 2020; (3) U.S. $1,897,615 aggregate principal amount of its outstanding 5.500% Notes due 2021; (4) U.S. $883,977 aggregate principal amount of its outstanding 6.375% Notes due 2021; (5) U.S. $17,316 aggregate principal amount of its outstanding 8.625% Bonds due 2022; (6) U.S. $96,970 aggregate principal amount of its outstanding Floating Rate Notes due 2022; (7) U.S. $235,177 aggregate principal amount of its outstanding 5.375% Notes due 2022; (8) U.S. $361,601 aggregate principal amount of its outstanding 4.875% Notes due 2022; (9) U.S. $344,853 aggregate principal amount of its outstanding 3.500% Notes due 2023; and (10) U.S. $433,946 aggregate principal amount of its outstanding 4.625% Notes due 2023. • On September 27, 2019, Petróleos Mexicanos consummated an exchange offer pursuant to which it exchanged (1) U.S. $940,618 aggregate principal amount of its outstanding 4.875% Notes due 2022, (2) U.S. $53,310 aggregate principal amount of its outstanding 8.625% Bonds due 2022, (3) U.S. $334,442 aggregate principal amount of its outstanding Floating Rate Notes due 2022, (4) U.S. $654,668 aggregate principal amount of its outstanding 5.375% Notes due 2022, (5) U.S. $389,985 aggregate principal amount of its outstanding 3.500% Notes due 2023, (6) U.S. $612,735 aggregate principal amount of its outstanding 4.625% Notes due 2023, (7) U.S. $58,982 aggregate principal amount of its outstanding 8.625% Guaranteed Bonds due 2023, (8) U.S. $466,787 aggregate principal amount of its outstanding 4.875% Notes due 2024, (9) U.S. $208,769 aggregate principal amount of its outstanding 4.250% Notes due 2025, (10) U.S. $1,439,479 aggregate principal amount of its outstanding 6.500% Bonds due 2041, (11) U.S. $730,486 aggregate principal amount of its outstanding 5.500% Bonds due 2044, (12) U.S. $1,439,519 aggregate principal amount of its outstanding 6.375% Bonds due 2045 and (13) U.S. $277,215 aggregate principal amount of its outstanding 5.625% Bonds due 2046 for U.S. $1,102,232 aggregate principal amount of its new 6.490% Notes due 2027, U.S. $1,163,586 aggregate principal amount of its new 6.840% Notes due 2030 and U.S. $5,065,788 aggregate principal amount of its new 7.690% Bonds due 2050. • On October 11, 2019, Petróleos Mexicanos consummated an exchange offer pursuant to which it exchanged (1) U.S. $7,698 aggregate principal amount of its outstanding 4.875% Notes due 2022, (2) U.S. $10 aggregate principal amount of its outstanding 8.625% Bonds due 2022, (3) U.S. $120 aggregate principal amount of its outstanding Floating Rate Notes due 2022, (4) U.S. $500 aggregate principal amount of its outstanding 5.375% Notes due 2022, (5) U.S. $4,247 aggregate principal amount of its outstanding 3.500% Notes due 2023, (6) U.S. $3,050 aggregate principal amount of its outstanding 4.625% Notes due 2023, (7) U.S. $20 aggregate principal amount of its outstanding 8.625% Guaranteed Bonds due 2023, (8) U.S. $595 aggregate principal amount of its outstanding 4.875% Notes due 2024 and (9) U.S. $273 aggregate principal amount of its outstanding 4.250% Notes due 2025 for U.S. $8,198 aggregate principal amount of its new 6.490% Notes due 2027, U.S. $7,245 aggregate principal amount of its new 6.840% Notes due 2030 and U.S. $617 aggregate principal amount of its new 7.690% Bonds due 2050. • On November 14, 2019, Petróleos Mexicanos entered into a Ps. 28,000,000 syndicated revolving credit line due in 2022. • On December 23, 2019, Petróleos Mexicanos issued Ps. 5,100,368 aggregate principal amount of Certificados Bursatiles due 2024 at a rate linked to the TIIE plus 1%. These Certificados Bursatiles were issued under Petróleos Mexicanos’ Ps. 100,000,000 or Unidades de Inversi ó n As of December 31, 2019, Petróleos Mexicanos had U.S. $7,450,000 and Ps. 37,000,000 in available credit lines in order to provide liquidity, of which U.S. $6,780,000 and Ps. 16,000,000 are available. All the financing activities mentioned above were guaranteed by Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services (until July 1, when merged, see Note 1) and Pemex Logistics. From January 1 to December 31, 2019, HHS obtained U.S. $22,456,000 from its revolving credit line and repaid U.S. $21,600,000. As of December 31, 2018, the outstanding amount under this revolving credit line was U.S. $700,000. As of December 31, 2019, the outstanding amount under this revolving credit line was U.S. $1,556,000. Various financial transactions (including credit facilities and bond issuances) require compliance with various covenants that, among other things, place restrictions on the following types of transactions by PEMEX, subject to certain exceptions: • The sale of substantial assets essential for the continued operations of its business. • The incurrence of liens against its assets. • Transfers, sales or assignments of rights to payment not yet earned under contracts for the sale of crude oil or natural gas, accounts receivable or other negotiable instruments. As of December 31, 2020 and 2019 and as of the date of the issuance of these consolidated financial statements, PEMEX was in compliance with the covenants described above. As of December 31, 2020 and 2019, debt was as follows: 2020 Rate of interest (1) Maturity Pesos Foreign currency U.S. dollars Bonds Fixed from 1.7% to 9.5% and LIBOR plus 0.35% to 3.65% Various to 2060 1,290,409,906 U.S. 64,686,416 Project financing Fixed from 2.45% and LIBOR plus 0.24% to 1.75% Various to 2028 34,345,097 1,721,671 Direct loans Fixed to 5.25% and LIBOR plus 1.75% to 4.25% Various to 2031 28,275,087 1,417,390 Syndicated loans LIBOR plus 2.35% Various to 2024 49,871,676 2,499,996 Bank loans LIBOR plus 3.50% to 5.28% Various to 2023 1,170,542 58,678 Revolving credit lines LIBOR plus 2.00% to 3.75% and Fed effective plus 1.30% 2021 119,110,538 5,970,842 Financing of Infrastructure asset Fixed from 5.4% and 8.4% Various to 2036 28,131,267 1,410,180 Total financing in U.S. dollars 1,551,314,113 U.S. 77,765,173 Euros Bonds Fixed from 1.875% to 5.5% and EURIBOR plus 2.4% Various to 2030 307,867,094 € 12,614,815 Direct loans Fixed to 5.11% Various to 2023 12,202,600 500,000 Total financing in Euros 320,069,694 € 13,114,815 Japanese yen: Bonds Fixed from 0.54% to 3.5% Various to 2026 21,243,790 ¥ 109,900,621 Pesos Certificados bursátiles TIIE plus 1.00%, and fixed at 7.19% to 7.65% Various to 2026 113,253,512 Direct loans Fixed at 6.55% and TIIE plus 0.85% to 4.1% Various to 2029 19,061,275 Plus Factoring TIIE plus 1.25% to 2.0% In 2021 4,067,650 Syndicated loans TIIE plus 0.95% Various to 2025 19,740,035 Monetization of Mexican Government Bonds Fixed at 8.56275% Various to 2023 95,597,610 Total financing in pesos 251,720,082 UDIs Certificados bursátiles Zero rate and Fixed at 3.02% to 5.23% Various to 2035 37,346,014 Other currencies: Bonds Fixed from 1.75% to 8.25% Various to 2025 33,355,569 Total principal in pesos (2) 2,215,049,262 Plus: accrued interest 42,656,852 Notes payable to contractors (3) 1,021,203 Total principal and interest 2,258,727,317 Less: short-term maturities 347,755,237 Current portion of notes payable to contractors (3) 685,178 Accrued interest 42,656,852 Total short-term debt and current portion of long-term debt 391,097,267 Long-term debt 1,867,630,050 2019 Rate of interest (1) Maturity Pesos Foreign currency U.S. dollars Bonds Fixed from 1.7% to 9.5% and LIBOR plus 0.35% to 3.65% Various to 2050 1,118,518,559 U.S. $ 59,352,968 Project financing Fixed from 2.45% and LIBOR plus 0.24% to 1.75% Various to 2028 41,154,129 2,183,799 Direct loans Fixed from 2.50% to 5.25% and LIBOR plus 1.65% to 3.50% Various to 2031 62,698,930 3,327,050 Syndicated loans LIBOR plus 2.35% Various to 2024 47,107,647 2,499,716 Bank loans LIBOR plus 1.19% to 3.50% Various to 2023 1,862,411 98,827 Revolving credit lines LIBOR plus 1.85% 2020 12,626,284 670,000 Financing of Infrastructure asset Fixed from 5.4% and 8.4% Various to 2036 28,143,335 1,493,395 Total financing in U.S. dollars 1,312,111,295 U.S. $ 69,625,755 Euros Bonds Fixed from 1.875% to 5.5% and EURIBOR plus 2.4% Various to 2030 293,984,741 € 13,897,557 Direct loans Fixed to 5.11% and EURIBOR plus 2.5% Various to 2023 11,561,660 546,554 Total financing in Euros 305,546,401 € 14,444,111 Japanese yen: Bonds Fixed from 0.54% to 3.5% and LIBOR yen plus 0.75% Various to 2026 30,148,292 ¥ 173,865,582 Pesos Certificados bursátiles Mexican Government Treasury Certificates (“Cetes”) , TIIE (1) Various to 2026 133,409,581 Direct loans Fixed at 6.55% and 7.01% and TIIE plus 0.85% to 4.01% Various to 2029 38,558,166 Syndicated loans TIIE plus 0.95% Various to 2025 24,270,589 Revolving credit lines TIIE plus 1.50% and 1.95% Various to 2020 21,000,000 Total financing in pesos 217,238,336 UDIs Certificados bursátiles Zero rate and Fixed at 3.02% to 5.23% Various to 2035 41,388,521 Other currencies: Bonds Fixed from 1.5% to 8.25% Various to 2025 41,553,990 Total principal in pesos (2) 1,947,986,835 Plus: accrued interest 33,146,807 Notes payable to contractors (3) 2,040,446 Total principal and interest 1,983,174,088 Less: short-term maturities 210,530,524 Current portion of notes payable to contractors (3) 1,246,854 Accrued interest 33,146,807 Total short-term debt and current portion of long-term debt 244,924,185 Long-term debt 1,738,249,903 The following table presents the roll-forward of total debt of PEMEX for each of the year ended December 31, 2020 and 2019, which includes short and long-term debt: 2020 (i) 2019 (i) Changes in total debt: At the beginning of the year Ps. 1,983,174,088 Ps. 2,082,286,116 Transfers to lease liabilities — (6,053,280 ) Loans obtained - financing institutions 1,292,197,518 1,167,834,946 Debt payments (1,151,962,147 ) (1,185,042,283 ) Accrued interest (ii) 144,207,950 128,061,187 Interest paid (130,989,150 ) (127,945,203 ) Foreign exchange 122,099,058 (75,967,395 ) At the end of the year Ps. 2,258,727,317 Ps. 1,983,174,088 (i) These amounts include accounts payable by Financed Public Works Contracts (“FPWC”) (formerly known as Multiple Services Contracts), which do not generate cash flows. (ii) For 2020 and 2019, includes Ps. 1,555,266 and Ps. (1,476,826), respectively, of income (expenses) consisting of Ps. 1,868,501 and Ps. (958,142), respectively, of expenses and discounts related to issuance of debt and Ps. (313,275) and Ps. (518,684), respectively, of fees to the issuance of debt. 2021 2022 2023 2024 2025 2026 and thereafter Total Maturity of the total principal outstanding and accrued interest as of December 31, 2020, for each of the years ending December 31. 391,097,267 117,932,866 131,155,018 181,061,085 114,228,026 1,323,253,055 2,258,727,317 (1) As of December 31, 2020 and 2019, interest rates were as follows: 3 month LIBOR of 0.23838% and 1.90838%, respectively; 6 month LIBOR of 0.25763% and 1.91213%, respectively; TIIE rate of 4.4842% and 7.5555%, respectively, for 28 days; TIIE rate of 4.4660% and 7.4465%, respectively, for 91 days. (2) Includes financing from foreign banks of Ps. 1,992,963,415 and Ps. 1,648,779,936, as of December 31, 2020 and 2019, respectively. (3) The total amounts of notes payable to contractors as of December 31, 2020 and 2019, current and long-term, are as follows: 2020 2019 Total notes payable to contractors (a) (b) Ps. 1,021,204 Ps. 2,040,446 Less: current portion of notes payable to contractors 685,179 1,246,854 Notes payable to contractors (long-term) Ps. 336,025 Ps. 793,592 (a) PEMEX has entered into FPWCs pursuant to which the hydrocarbons and construction in progress are property of Pemex Exploration and Production. Pursuant to the FPWC, the contractors manage the work in progress, classified as development, infrastructure and maintenance. As of December 31, 2020 and 2019, PEMEX had an outstanding amount payable of Ps. 81,364 and Ps. 755,860, respectively. (b) During 2007, Pemex Exploration and Production contracted for the purchase of a Floating Production Storage and Offloading (“FPSO”) vessel. The investment in the vessel totaled U.S. $723,575. As of December 31, 2020 and 2019, the outstanding balances owed to the contractor were Ps. 939,839 (U.S. $47,112) and Ps. 1,284,587 (U.S. $68,165), respectively. In accordance with the contract, the estimated future payments are as follows: Year Amount 2021 33,005 2022 17,265 Less accrued interest 3,158 Total 47,112 (4) As of December 31, 2020 and 2019, PEMEX used the following exchange rates to translate the outstanding balances in foreign currencies to pesos in the statement of financial position: 2020 2019 U.S. dollar Ps. 19.9487 Ps. 18.8452 Japanese yen 0.1933 0.1734 Pounds sterling 27.2579 24.9586 Euro 24.4052 21.1537 Swiss francs 22.5720 19.4596

Leases

Leases	12 Months Ended
	Dec. 31, 2020
Text block [abstract]
Leases	NOTE 17. LEASES PEMEX leases plants, transportation and storage equipment, port facilities, buildings and land. Leases generally run for a period of 1 to 20 years, in some cases with an option to renew the lease after that date. Some lease payments are renegotiated every five years to reflect that the rent payments are market compliant. Some of the leases provide for additional rental payments that are based on changes in local price indexes. For certain leases, PEMEX has restrictions to enter into a sublease agreement. Plants, transport and storage equipment, port facilities, buildings and land leases were entered into in previous years as service, transportation and building leases. PEMEX has rights of use assets for equipment whose contractual terms are from one to three years. These leases are short-term and / or low-value right-of-use Lease information where PEMEX is a lessee is presented as follows: i. Rights of use assets are as follow: Rights of use assets Transportation and Plants Drilling (1) Rights of use Port facilities Buildings Lands Total Balance as of January 1, 2019 U.S. $ 40,029,595 24,099,662 6,223,655 1,922,291 371,348 75,771 38,258 72,760,580 Depreciation of the year (5,377,668 ) (1,854,894 ) (162,153 ) (86,342 ) (33,949 ) (16,015 ) (3,028 ) (7,534,049 ) Additions 895,291 3,448,691 — — 1,286,054 5,456 — 5,635,492 Currency translation effect (43,709 ) — — — — — — (43,709 ) Balance as of December 31, 2019 35,503,509 25,693,459 6,061,502 1,835,949 1,623,453 65,212 35,230 70,818,314 Depreciation of the year (4,868,961 ) (1,869,775 ) (122,874 ) (84,399 ) 355,505 (17,567 ) (2,951 ) (6,611,022 ) Cancellations (5,476,350 ) — — — — — — (5,476,350 ) Additions 97,891 — — — 438,951 — 579 537,421 Currency translation effect 12,292 — — — — 1,116 511 13,919 Impairment — — — (87,025 ) — — — (87,025 ) Balance as of December 31, 2020 25,268,381 23,823,684 5,938,628 1,664,525 2,417,909 48,761 33,369 59,195,257 Estimated useful life 1 to 10 years 14 years 10 years 23 years 20 years 1to 5 years 5 years (1) Note 13-F. ii. Leases liabilities are as follows: 2020 2019 Lease liabilities recognized at January 1, 2020 Ps. 68,148,627 70,651,797 Additions 625,410 5,683,676 Cancellations (6,578,337 ) — Payments of principal (7,979,972 ) (10,709,421 ) Accrued interest 5,398,964 4,800,153 Interests paid (2,030,829 ) — Foreign exchange 5,600,265 (2,277,578 ) Lease liabilities at December 31, 2020 Ps. 63,184,128 68,148,627 The obligation recognized as of December 31, 2020 and 2019, amounted to Ps. 63,184,128 and Ps. 68,148,627, of which Ps. 8,106,937 and Ps. 5,847,085 were recognized in current liabilities and Ps. 55,077,191 and Ps. 62,301,542 in non-current iii. Amounts recognized in the statement of comprehensive Income Total 2020 2019 Depreciation of rights of use Ps. 7,229,231 7,429,275 Interests from lease liabilities 5,784,476 5,360,072 Expenses related to short-term leases 7,631 58,701 iv. Amounts recognized in the statement of cash flows Total 2020 2019 Lease payments (principal and interests) Ps. (10,010,801 ) (10,709,421 )

Derivative Financial Instrument

Derivative Financial Instruments	12 Months Ended
	Dec. 31, 2020
Investments accounted for using equity method [abstract]
Derivative Financial Instruments	NOTE 18. DERIVATIVE FINANCIAL INSTRUMENTS PEMEX faces market risk caused by the volatility of hydrocarbon prices, exchange rates and interest rates, credit risk associated with investments and financial derivatives, as well as liquidity risk. In order to monitor and manage these risks, PEMEX has approved general provisions relating to financial risk management, which are comprised of policies and guidelines that promote an integrated framework for risk management, regulate the use of DFIs, and guide the development of risk mitigation strategies. This regulatory framework establishes that DFIs should be used only for the purpose of mitigating financial risk. The use of DFIs for any other purpose must be approved in accordance with PEMEX’s current internal regulation. PEMEX has a Financial Risk Working Group (FRWG) which is a specialized working group with decision-making authority on financial risk exposure, financial risk mitigation schemes, and DFIs trading of Petróleos Mexicanos, the subsidiary entities, and where applicable, the subsidiary companies. Approved DFIs are mainly traded on the OTC (Over the Counter) market; however, exchange traded instruments may also be used. In the case of PMI Trading, DFIs are traded on CME-Clearport. The different types of DFIs that PEMEX trades are described below in the subsections corresponding to each risk type and as related to the applicable trading markets. One of PEMEX’s policies is to contribute to minimizing the impact that unfavorable changes in financial risk factors have on its financial results by promoting an adequate balance between incoming cash flows from operations and outgoing cash flows related to its liabilities. As part of the regulatory framework for financial risk management, PEMEX has established the eligible counterparties with which it may trade DFIs and other financial instruments. In addition, certain PMI Subsidiaries have implemented a regulatory framework for risk management with respect to its activities, which consists of policies, guidelines and procedures to manage the market risk associated with its commodity trading activities in accordance with industry best practices, such as: 1) the use of DFIs for financial risk mitigation purposes; 2) the segregation of duties; 3) valuation and monitoring mechanisms, such as the generation of a daily portfolio risk report, value at risk (“VaR”) computation; and 4) VaR limits, both at a global and business unit level and the implementation of stop loss mechanisms. Given that PEMEX’s outstanding DFIs have been entered into for risk mitigation purposes, particularly with economic hedging purposes, there is no need to establish and monitor market risk limits. For those portfolios with an open market risk exposure, PEMEX’s financial risk management regulatory framework establishes the implementation and monitoring of market risk metrics and limits (such as VaR, among others). PEMEX has also established credit guidelines for DFIs that Pemex Industrial Transformation offers to its domestic customers, which include the use of guarantees and credit lines. For exchange traded DFIs, PEMEX trades under the margin requirements of the corresponding exchange market, and therefore does not have internal policies for these DFIs. DFIs held with financial counterparties do not require collateral exchange clauses. Notwithstanding, PEMEX’s regulatory framework promotes credit risk mitigation strategies such as collateral exchange. PEMEX does not have an independent third party to verify compliance with these internal standards; however, PEMEX has internal control procedures that certify compliance with existing policies and guidelines. A. Risk Management I. Market Risk i. Interest rate risk PEMEX is exposed to fluctuations in floating interest rate liabilities. PEMEX is exposed to U.S. dollar LIBOR and to Mexican peso TIIE. As of December 31, 2020, approximately 14.3% of PEMEX’s total net debt outstanding (including DFIs) consisted of floating rate debt. Occasionally, for strategic reasons or in order to offset the expected inflows and outflows, PEMEX has entered into interest rate swaps and options. Through the swap agreements, PEMEX acquires the obligation to make payments based on a fixed interest rate in exchange for receiving payments referenced to a floating interest rate. On the other hand, under the option agreements, PEMEX acquires protection against possible raises in the floating interest rates of some of its liabilities. As of December 31, 2020, Petróleos Mexicanos was a party to four interest rate swap agreements denominated in U.S. dollars for an aggregate notional amount of U.S. $ 956,250 at a weighted average fixed interest rate of 2.35% and a weighted average term of 4.3 years. Similarly, in order to eliminate the volatility associated with variable interest rates of financing operations, PMI NASA has also executed four interest rate swap agreements denominated in U.S. dollars for an aggregate notional amount of U.S. $24,190, at a weighted average fixed interest rate of 4.17% and a weighted average term of 1.41 years. Moreover, PEMEX invests in pesos and U.S. dollars in compliance with applicable internal regulations, through portfolios that have different purposes that seek an adequate return subject to risk parameters that reduce the probability of capital losses. The objective of the investments made through these portfolios is to meet PEMEX’s obligations payable in pesos and U.S. dollars. The investments made through PEMEX’s portfolios are exposed to domestic and international interest rate risk and credit spread risk derived from government and corporate securities, and inflation risk arising from the relationship between UDIs and pesos. However, these risks are mitigated by established limits on exposure to market risk. IBOR reference rates transition As a result of the decision made by the Financial Stability Board (FSB), the Interbank Offered Rates (IBORs), such as the LIBOR in dollars, will cease to be published in 2022, and are expected to be replaced by alternative reference rates, based on risk-free rates obtained from market operations. The discontinuation of the publication of these rates was scheduled for December 2021, nevertheless, on November 2020 the ICE Benchmark Administration Limited (known as “ICE”) announced an extension until June 2023 for the publication of the most common LIBOR rates in dollars. Therefore, PEMEX has identified and is reviewing contracts expiring after the applicable cessation dates, which could have an impact derived from the change in the aforementioned rates. PEMEX will continue working on amendments to any contracts which may be required as a result of the transition. PEMEX has a reduced number of financial instruments referenced to floating rates in U.S. dollars with maturity and interest rate fixation after June 2023. This portfolio is composed of debt instruments and DFIs as shown below: Notional Amounts (in thousands of each Currency) U.S. $ Debt (3,972,777 ) DFIs Interest Rate Swaps 400,000 Interest Rate Options (2,500,000 ) figures not audited To the date, PEMEX is monitoring the evolution of the IBORs transition in the market, to anticipate any negative impact that these changes could have. Once the alternative reference rates are defined, as well as the new discount curves and any other valuation parameters, PEMEX will be able to estimate the impact that such changes will have on financial instruments’ market value and financial cost. ii. Exchange rate risk Most of PEMEX’s revenues are denominated in U.S. dollars, a significant amount of which is derived from exports of crude oil and petroleum products, which are priced and payable in U.S. dollars. Additionally, PEMEX’s revenues from domestic sales of gasoline and diesel net of IEPS Tax, tax duties, incentives, and other related taxes, as well as domestic sales of natural gas and its byproducts, LPG and petrochemicals, are referenced to international U.S. dollar-denominated prices. PEMEX’s expenses related to hydrocarbon duties are calculated based on international U.S. dollar-denominated prices and the cost of hydrocarbon imports that PEMEX acquires for resale in Mexico or use in its facilities are indexed to international U.S. dollar-denominated prices. By contrast, PEMEX’s capital expenditure and operating expenses are established in pesos. As a result of this cash flow structure, the depreciation of the peso against the U.S. dollar increases PEMEX’s financial balance. The appreciation of the peso relative to the U.S. dollar has the opposite effect. PEMEX manages this risk without the need for hedging instruments, because the impact on PEMEX’s revenues of fluctuations in the exchange rate between the U.S. dollar and the peso is offset in whole or in part by its impact on its obligations. PEMEX prioritizes debt issuances denominated in U.S. dollars; nonetheless, this is not always achievable, hence non-U.S. As a consequence of the above, PEMEX’s debt issued in international currencies other than U.S. dollars has exchange rate risk mitigation strategies. PEMEX has selected strategies that further seek to reduce its cost of funding by leaving, in some cases, part of this exchange rate exposure unhedged when assessed as appropriate. The underlying currencies of PEMEX’s DFIs are the euro, Swiss franc, Japanese yen and pounds sterling against the U.S. dollar and UDIs against the peso. As of December 31, 2020, PEMEX did not enter into any DFIs, since no debt in currencies other than U.S. dollars or pesos was issued. Nonetheless, during 2020, PEMEX carried out the restructure three cross-currency swaps, one of which had a recouponing provision. These DFIs hedged the exchange rate exposure of a €1,250,000 debt with maturity in 2027. For this restructuring PEMEX entered into, without cost, structures which are composed of a cross-currency swap and the sale of a call option, guaranteeing complete protection up to a certain exchange rate and partial protection above that level. This allowed PEMEX to eliminate the recouponing provision without cost. Once this restructure had been carried out, 10% of this debt remains hedged with a cross-currency swap. Additionally, during 2019 PEMEX restructured a cross-currency swap which had a recouponing provision. This DFI hedged the exchange rate exposure of a €725,000 debt with maturity in 2025. For this restructure PEMEX entered into, without cost, three options structures called “Seagull Options” to hedge the same notional risk as the original swap. These structures protect the short exposure in euros against an appreciation of the euro versus the U.S. dollar in a specific range and result in a benefit if the euro depreciates up to a certain exchange rate. In addition, in order to mitigate the exchange rate risk derived from the coupons, PEMEX entered into only coupon swaps for the same notional amount. These eliminated the recouponing provision without cost. PEMEX recorded a total net foreign exchange (loss) gain of Ps. (128,949,304), Ps. 86,930,388 and Ps. 23,659,480, for the years ended December 31, 2020, 2019 and 2018, respectively; these amounts include the unrealized foreign exchange gain (loss) associated with debt of Ps. 122,099,058, Ps. 75,967,395 and Ps. 19,762,208 for the years ended December 31, 2020, 2019 and 2018, respectively. Unrealized foreign exchange gains and losses do not impact PEMEX’s cash flows. The depreciation of the peso during 2020 caused a total net foreign exchange loss because a significant part of PEMEX’s debt, 88.64% (principal only) as of December 31, 2020 is denominated in foreign currency. Unrealized foreign exchange losses and gains do not impact PEMEX’s cash flows. Due to the cash flow structure described above, the depreciation of the peso relative to the U.S. dollar does not affect PEMEX’s ability to meet U.S. dollar-denominated financial obligations and improves PEMEX’s ability to meet peso-denominated Certain of the PMI Subsidiaries face market risks generated by fluctuations in foreign exchange rates. In order to mitigate these risks, the boards of directors of several of these companies have authorized a policy which stipulates that financial assets must be denominated in its functional currency, unless the company owes a duty or expected payment in a currency other than its functional one. Finally, a significant amount of PMI Trading’s income and expenses, including the cost of sales and related sales costs, is derived from the trade of refined products, petrochemicals and gas liquids to PEMEX subsidiaries and third parties, whose prices are determined and are payable in U.S. dollars. PMI Trading’s exposure to foreign currency risk results primarily from the need to fund tax payments denominated in domestic currency, as well as from certain related sales costs denominated in domestic currency. PMI Trading believes it can adequately manage the risk created by the payment of taxes in domestic currency without the need to enter into hedging instruments because the exposure to this risk is marginal relative to the total flows of U.S. dollar. In addition, in the event that a potential foreign exchange risk arises in connection with a commercial transaction, PMI Trading may implement risk mitigation measures by entering into DFIs. iii. Hydrocarbon Price Risk PEMEX periodically assesses its revenues and expenditures structure in order to identify the main market risk factors that PEMEX’s cash flows are exposed to in connection with international hydrocarbon prices. Based on this assessment, PEMEX monitors its exposure to the most significant risk factors and quantifies their impact on PEMEX’s financial balance. PEMEX’s exports and domestic sales are directly or indirectly related to international hydrocarbon prices. Therefore, PEMEX is exposed to fluctuations in these prices. In terms of crude oil and natural gas, part of this risk is transferred to the Mexican Government under PEMEX’s current fiscal regime. PEMEX’s exposure to hydrocarbon prices is partly mitigated by natural hedges between its inflows and outflows. Additionally, PEMEX continuously evaluates the implementation of risk mitigation strategies, including those involving the use of DFIs, taking into consideration their operative and budgetary feasibility. In 2017, the Board of Directors of Petróleos Mexicanos approved the establishment of an Annual Oil Hedging Program. Since then, PEMEX has implemented hedging strategies to partially protect its cash flows from falls in the Mexican crude oil basket price below the one established in the Federal Revenue Law. During 2018, PEMEX entered into a crude oil hedge for fiscal year 2019, pursuant to which PEMEX hedged 320 thousand barrels per day for the period between December 2018 and December 2019, for U.S. $149,588. Afterwards, during 2019 PEMEX entered into a crude oil hedge for fiscal year 2020, pursuant to which PEMEX hedged 243 thousand barrels per day for the period between December 2019 and December 2020, for U.S. $178,268. Finally, during 2020 PEMEX entered into a crude oil hedge for fiscal year 2021, pursuant to which PEMEX hedged 332.5 thousand barrels per day for the period between December 2020 and June 2021, for U.S. $119,920. In addition to supplying natural gas, Pemex Industrial Transformation can offer DFIs to its domestic customers in order to provide them with support to mitigate the risk associated with the volatility of natural gas prices. Since 2017, when this service began to be offered, Pemex Industrial Transformation must enter into DFIs with Petróleos Mexicanos under the opposite position to those DFIs offered to its customers in order to mitigate the market risk it would bear under such offered DFIs. Petróleos Mexicanos then transfers the related price risk derived from the DFI position held with Pemex Industrial Transformation to financial counterparties by entering into the opposite position of such DFI with the counterparty. As of December 31, 2020, there were no DFIs since all the DFIs in its portfolio expired in 2019. In the event that Pemex Industrial Transformation enters into new trades, its DFI portfolio has VaR and CaR limits in order to limit market risk exposure. PMI Trading faces market risk generated by the terms of the purchase and sale of refined products and natural gas liquids, as well as the volatility of oil prices. Accordingly, it frequently enters into DFIs in order to mitigate this risk, thereby reducing the volatility of its financial results. In accordance with the risk management regulatory framework that PMI Trading has implemented, VaR and the change in profit and loss by portfolio are calculated daily and compared to the maximum applicable limits in order to implement risk mitigation mechanisms as necessary. iv. Market risk quantification The quantification of market risk exposure in PEMEX’s financial instruments is presented below, in accordance with the applicable international risk management practices. Interest rate risk quantification The quantification of interest rate risk of investment portfolios is carried out by using the one-day As of December 31, 2020, the VaRs of PEMEX’s investment portfolios were Ps. (7.81) for the Peso Treasury Portfolio, Ps. 0.00 for FOLAPE, and U.S. $0.00 for the U.S. Dollar Treasury Portfolio. Additionally, PEMEX has a portfolio of Mexican Government bonds. These securities are classified for accounting purposes as restricted assets. These securities are considered not to be exposed to market risk, unlike the investment portfolios’ securities. Therefore, there is no need to calculate a VaR. In addition to the exposure to interest rate fluctuations of the DFIs in which PEMEX is obligated to make payments referenced to floating rates, PEMEX’s DFIs are exposed to mark-to-market (“MtM”) volatility as a result of changes in the interest rate curves used in their valuation. Interest rate risk quantification was calculated for DFIs in conjunction with the interest rate risk quantification for the debt portfolio. The following table shows the sensitivity of PEMEX’s DFIs and debt portfolio to a parallel shift of 10 basis points (bp) over the zero coupon rate curves. The 10bp parallel shift may be used to estimate in a simple manner the impact for proportional values to this shift and was selected in accordance with market practices for financial risk management. For the debt portfolio, interest rate risk sensitivity was calculated taking into account both the DFI interbank market yield curves and the PEMEX curves (which were also used to estimate the debt portfolios’ fair value). These metrics were calculated solely for informational purposes and are not used for portfolio management purposes because PEMEX does not intend to prepay its debt or terminate its DFIs early. Therefore, there is no interest rate risk arising from fixed rate obligations. INTEREST RATE and CURRENCY DFIs Interest rate sensitivity to + 10 bp Interbank Yield Curves PEMEX Curves Currency Sensitivity Sensitivity DFIs Sensitivity Sensitivity debt CHF 1,472 (1,318 ) 154 1,352 Euro 75,107 (59,653 ) 15,454 56,790 Pound Sterling 4,123 (3,845 ) 278 3,469 Yen 5,478 (2,202 ) 3,276 4,314 Peso 32,446 731 33,177 25,855 UDI 12,935 (12,935 ) 0 7,093 U.S. dollar 1,425,168 198,150 1,623,318 482,311 Figures not audited In addition, PEMEX performed a retrospective sensitivity analysis of the impact on its financial statements for the years ended December 31, 2020, 2019 and 2018, in which PEMEX assumed either an increase or decrease of 25 basis points in the floating interest rates of its debt and corresponding hedges. At December 31, 2020, 2019 and 2018, had market interest rates been 25 basis points higher, with all other variables remaining constant, net loss for the year would have been Ps. 606,839, Ps. 644,506 and Ps. 649,339 higher for December 31, 2020, 2019 and 2018, respectively, primarily as a result of an increase in interest expense. Conversely, had market interest rates been 25 basis points lower, net loss for the year would have been Ps. 606,839, Ps. 644,506 and Ps. 649,339 lower at December 31, 2020, 2019 and 2018, respectively, primarily as a result of a decrease in interest expense. Exchange rate risk quantification The investments of PEMEX’s portfolios do not face foreign exchange rate risk because the funds of such portfolios are used to meet obligations in pesos and U.S. dollars. Currency DFIs are entered into in order to hedge exchange rate risk arising from debt flows in currencies other than pesos and U.S. dollars or inflation risk arising from debt flows in UDIs. However, due to the accounting treatment, net income is exposed to MtM volatility, mainly as a result of changes in the exchange rates used in their valuation. Exchange rate risk quantification was calculated for DFIs in conjunction with the exchange rate risk quantification for the debt portfolio. The following table shows the sensitivity of PEMEX’s DFIs and debt portfolio to an increase of 1% to the exchange rates of currencies against the U.S. dollar. The 1% may be used to estimate in a simple manner the impact for proportional values to this increase and was selected in accordance with market practices for financial risk management. For the debt portfolio, exchange rate risk sensitivity was calculated taking into account both, interbank market yield curves and the PEMEX curves. In addition, the table shows the one-day INTEREST RATE and CURRENCY DFIs Exchange rate sensitivity +1% and VaR 95% Interbank Yield Curves PEMEX Curves Currency Sensitivity Sensitivity Sensitivity VaR 95% Sensitivity Debt CHF (6,206 ) 6,168 (38 ) (29 ) (5,840 ) Euro (195,594 ) 133,604 (61,990 ) (47,729 ) (165,822 ) Pound Sterling (12,857 ) 12,804 (54 ) (53 ) (11,535 ) Yen (11,453 ) 3,123 (8,330 ) (6,304 ) (9,423 ) Peso (138,257 ) (18,326 ) (156,583 ) (247,424 ) (121,302 ) UDI (21,795 ) 21,795 (0 ) (0 ) (15,376 ) Figures not audited As shown in the table above, exchange rate risk derived from debt denominated in currencies other than pesos and U.S. dollars is almost fully hedged by DFIs. The exchange rate risk exposure to the Swiss franc, euro, pound sterling and Japanese yen is a result of the delta of the structures described above (Seagull Options and Calls), and considering the current exchange rate levels, represents a lower funding cost than the hedging strategies carried out through swaps. In addition, PEMEX performed a retrospective sensitivity analysis of the impact on its financial statements of the years ended December 31, 2020, 2019 and 2018, in which PEMEX assumed either an increase or decrease of 10% in the exchange rate between the U.S. dollar and peso in order to determine the impact on net income and equity as a result of applying these new rates to the monthly balances of assets and liabilities denominated in U.S. dollars. At December 31, 2020, 2019 and 2018, had the peso depreciated against the U.S. dollar by 10% with other variables remaining constant, net income would have been Ps. 168,334, Ps.180,408 and Ps.192,025 lower, respectively, primarily as a result of an increase in the exchange rate losses. However, had the peso appreciated against the U.S. dollar by 10%, net income for the period would have increased by Ps. 168,334, Ps.180,408 and Ps. 192,025, respectively, primarily as a result of the decrease in exchange rate losses. Hydrocarbon price risk quantification Pemex Industrial Transformation occasionally faces market risk due to open positions arising from the mismatch between the DFI portfolio offered to domestic customers and hedges with international counterparties. As of December 31, 2020, Pemex Industrial Transformation’s natural gas DFI portfolios had no market risk exposure, as all the DFIs in its portfolios expired in 2019. Open market risk exposure would be measured using the 20-day pre-established It should be noted that sensitivity analyses were not carried out for other financial instruments, such as accounts receivable and payable (as defined in the financial reporting standards). Such accounts are cleared in short-term, and therefore market risk is considered to be nonexistent. Most of these accounts are related to hydrocarbon prices. In accordance with the risk management regulatory framework that PMI Trading has implemented, VaR and the change in profit and loss by portfolio are calculated daily and compared to the maximum applicable limits in order to implement risk mitigation mechanisms as necessary. PMI Trading’s global VaR associated with commodities market risk was U.S. $(17,102) as of December 31, 2020. This VaR was calculated using the historical method with a 99% confidence level, two-year one-day The quantification of crude oil price risk is carried out by using the one-day II. Credit Risk When the fair value of a DFI is favorable to PEMEX, PEMEX faces the risk that the counterparty will not be able to meet its obligations. PEMEX monitors its counterparties’ creditworthiness and calculates the credit risk exposure for its DFIs. As a risk mitigation strategy, PEMEX only enters into DFIs with major financial institutions with a minimum credit rating of BBB-. In order to estimate PEMEX’s credit risk exposure to each financial counterparty, the potential future exposure is calculated by projecting the risk factors used in the valuation of each DFI in order to estimate the MtM value for different periods, taking into account any credit risk mitigation provisions. Moreover, PEMEX has entered into various long-term cross-currency swaps agreements with “recouponing” provisions (pursuant to which the payments on the swaps are adjusted when the MtM exceeds the relevant threshold specified in the swap), thereby limiting the exposure to its counterparties to a specific threshold amount, as well as the counterparties’ exposure to PEMEX. The specified thresholds were reached in five cross-currency swaps during 2020, which were used to hedge the exchange rate exposure to the euro and to the pounds sterling, and in three cross-currency swaps during 2019, which were used to hedge the exchange rate exposure to the euro and to the pounds sterling. This resulted in the cash settlement of such swaps and the resetting of swap terms to return their MtM value to zero. During 2020, PEMEX did not enter into any cross-currency swap with these characteristics. In addition, PEMEX has entered into long-term DFIs with mandatory early termination clauses (pursuant to which, at a given date and irrespective of the current MtM, the DFI will terminate and settle at the corresponding MtM, and PEMEX can either enter into a new DFI with the same counterparty or a new counterparty), which reduces the credit risk generated by the term of the DFI by bounding it to a specific date. As of December 31, 2020, PEMEX has entered into two Japanese yen Seagull Option structures, with early termination clauses in July 2021. PEMEX intends to renew these trades in order to maintain the hedge. According to IFRS 13 “Fair Value Measurement,” the fair value or MtM value of DFIs must reflect the creditworthiness of the parties. Consequently, the fair value of a DFI takes into account the risk that either party may default on its obligation. Due to the above, PEMEX applies the credit value adjustment (“CVA”) method to calculate the fair value of its DFIs. For each DFI, the CVA is calculated by determining the difference between the MtM and the estimated MtM adjusted for credit risk. In determining the credit risk, the CVA method takes into account the current market perception about the credit risk of both counterparties, using the following inputs: a) the MtM projection for each payment date based on forward yield curves; b) the implied default probability obtained from both, PEMEX and the counterparty’s credit default swaps, at each payment date; and c) the default recovery rates of each counterparty. The current and potential exposures, aggregated by credit rating, are as follows: Maximum Credit Exposure by term in Petróleos Mexicanos Rating Current Less than 1-3 years 3-5 years 5-7 years 7-10 years More A+ 159,107 688,392 558,981 306,952 117,716 119,358 — A 18,079 248,971 338,829 301,736 167,414 100,000 — A- (19,996 ) 365,910 294,322 131,104 122,823 — — BBB+ 397,989 546,936 720,605 613,680 556,650 261,542 174,457 BBB 211,862 466,967 767,225 867,931 648,179 438,457 320,565 BBB- (10,213 ) 99,334 178,698 175,904 136,312 139,725 — Figures not audited PEMEX also faces credit risk derived from its investments. As of December 31, 2020, all the positions in domestic currency were in Mexican Government bonds in pesos. Given the current credit rating, the default probability in this currency is zero according to the default’s frequency matrices from rating agencies, therefore no quantification or disclosure of this exposure is made. Furthermore, by means of its credit guidelines for DFI operations, Pemex Industrial Transformation significantly has reduced its credit risk exposure related to the DFIs. In order to qualify for these DFIs, Pemex Industrial Transformation’s customers must be party to a current natural gas supply contract and sign a domestic master derivative agreement. Additionally, according to the credit guidelines, DFIs with these customers must be initially secured by cash deposits, letters of credit or other collateral provisions, as required. The credit guidelines indicate that Pemex Industrial Transformation may offer DFIs with an exemption from collateral requirements up to certain amounts through a credit line approved by the credit committee, based on an internal financial and credit assessment. Moreover, if the credit line is insufficient to cover each client’s exposure, the client is obligated to deposit collateral. In accordance with these guidelines, in the event that a client does not meet its payment obligations, DFIs related to this client would be terminated, rights to any available collateral would be exercised and, if the collateral were insufficient to cover the fair value, or in the absence of collateral, natural gas supply would be suspended until the payment is made. As of December 31, 2020, Pemex Industrial Transformation had no DFIs since all the DFIs of its portfolios expired in 2019. As such, once the total settlement of the operations was carried out, the exempt credit lines expired and the guarantees deposited by the clients were entirely returned. PMI Trading’s credit risk associated with DFI transactions is mitigated through the use of futures and standardized instruments that are cleared through CME-Clearport. III. Liquidity Risk PEMEX’s main internal source of liquidity comes from its operations. Additionally, through its debt planning and the purchase and sale of U.S. dollars, PEMEX currently preserves a cash balance at a level of liquidity in domestic currency and U.S. dollars that is considered adequate to cover its investment and operating expenses, as well as other payment obligations, such as those related to DFIs. In addition, as of December 31, 2020, PEMEX has acquired committed revolving credit lines in order to mitigate liquidity risk, two of which provide access to Ps. 28,000,000 and Ps. 9,000,000 with expiration dates in November 2022 and November 2023, respectively; another revolving credit line provides access to U.S. $5,500,000 with expiration date in June 2024. Finally, the investment strategies of PEMEX’s portfolios are structured by selecting time horizons that consider each currency’s cash flow requirements in order to preserve liquidity. Certain PMI Subsidiaries mitigate their liquidity risk through several mechanisms, the most important of which is the centralized treasury, which provides access to two syndicated credit lines for up to U.S. $700,000 and U.S. $1,500,000 (this last credit line was transferred from Petróleos Mexicanos to PMI during December 2020) and cash surplus capacity in the custody of the centralized structure. In addition, certain PMI Subsidiaries have access to bilateral credit lines from financial institutions for up to U.S. $250,000. These companies monitor their cash flow on a daily basis and protect their creditworthiness in the financial markets. Liquidity risk is mitigated by monitoring certain financial ratios as set forth in the policies approved by each company’s board of directors. The following tables show the cash flow maturities as well as the fair value of PEMEX’s debt and DFI portfolios as of December 31, 2020 and 2019. It should be noted that: • For debt obligations, these tables present principal cash flow and the weighted average interest rates for fixed rate

Employee Benefits

Employee Benefits	12 Months Ended
	Dec. 31, 2020
Text block [abstract]
Employee Benefits	NOTE 19. EMPLOYEE BENEFITS Until December 31, 2015, Petróleos Mexicanos and Subsidiary Entities only had defined benefit pension plans for the retirement of its employees, to which only Petróleos Mexicanos and the Subsidiary Entities contribute. Benefits under these plans are based on an employee’s salary and years of service completed at retirement. As of January 1, 2016, Petróleos Mexicanos and the Subsidiary Entities also have a defined contribution pension plan, in which both Petróleos Mexicanos and the Subsidiary Entities and the employee contribute to an employee’s individual account. Benefits under the defined benefit plan are mainly based on the years of service completed by the employee, and their remuneration at the date of retirement. The obligations and costs of these plans are recognized based on an actuarial valuation prepared by independent experts. Within the regulatory framework of plan assets, there are no minimum funding requirements. Petróleos Mexicanos and the Subsidiary Entities have established additional plans to cover post-employment benefits, which are based on actuarial studies prepared by independent experts and which include disability, post-mortem pension and the death of retired employees, as well as medical services for retired employees and beneficiaries. As of December 31, 2019, Petróleos Mexicanos and Subsidiary Entities funded its employees benefits through Mexican trusts, the resources of which come from the retirement line item of PEMEX’s annual budget (an operating expense), or any other line item that substitutes or relates to this line item, or that is associated with the same line item and the interests, dividends or capital gains obtained from the investments of the trusts. In 2019, the Board of Directors of Petróleos Mexicanos approved modifications to the organic structure of PEMEX. As a result of this, the Subsidiary Entities and Petróleos Mexicanos transferred and / or received active personnel through the figure of employer substitution, with which the Subsidiary Entities and Petróleos Mexicanos recognized the retirement obligations of the transferred personnel whose impact was calculated in the actuarial study carried out by the independent experts. The following table show the amounts associated with PEMEX’s labor obligations: December 31, 2020 2019 Liability for defined benefits at retirement and post-employment at the end of the year Ps. 1,516,671,029 Ps. 1,438,849,732 Liability for other long-term benefits 18,497,057 17,965,635 Total liability for defined benefits recognized in the consolidated statement of financial position at the end of the year Ps. 1,535,168,086 Ps. 1,456,815,367 The amount reflected in the Employee Benefit Reserve at the end of the year includes both the defined benefit plan (DB) and the defined contribution plan (DC). As for the defined contribution scheme, the Assets (liabilities) recognized in the balance sheet (DC-warranty) went from Ps. 2,023,220 in 2019 to Ps. 3,051,044 in 2020. The expense in the Income Statement (net cost for the period, DC-guarantee) was Ps. 356,880 and Ps. 316,915 for the year December 31, 2020 and 2019, respectively. The following tables contain detailed information regarding PEMEX’s retirement and post-employment benefits: December 31, Changes in the liability for defined benefits 2020 2019 Liability for defined benefits at the beginning of the year Ps. 1,438,849,732 Ps. 1,067,317,120 Current Service cost 22,742,631 15,871,004 Net interest 105,699,575 95,643,572 Defined benefits paid by the fund (5,168,608 ) (5,759,721 ) Actuarial losses (gains) in other comprehensive results due to: Change in financial assumptions (1) 77,094,827 304,527,285 Change in demographic assumptions (1) (18,581,935 ) (9,012,031 ) For experience during the year (1) (41,069,054 ) 25,228,095 Assets of the plan during the year (1) 32,531 (43,628 ) Effect of the liability ceiling * — (127,137 ) Real interest, excluding earned interests * — (363,873 ) Adjustment to the Defined Contribution Plan * — 61,583 Remeasurements — (96,828 ) Contributions paid to the fund (62,928,670 ) (54,395,709 ) Defined benefit liabilities at end of year Ps. 1,516,671,029 Ps. 1,438,849,732 * The concepts come from the valuation of PMI CIM´s liabilities . (1) The amount of actuarial losses corresponding to retirement and post-employment benefits recognized in other comprehensive income net of deferred income tax for Ps. (19,182,373) in the year ended December 31, 2020, corresponded mainly to the decrease in the discount rate, from 7.53% in 2019 to 7.08% in 2020, as well as the decrease in the salary increase rate, from 5.02% in 2019 to 4.47% in 2020, and the gradual increase in the rate of mortality for non-disabled December 31, Changes in pension plan assets 2020 2019 Plan assets at the beginning of year Ps. 2,585,007 Ps. 7,200,471 Return on plan assets 262,273 833,638 Payments by the pension fund (63,204,515 ) (59,967,278 ) Company contributions to the fund 62,928,670 54,395,709 Actuarial (gains) losses in plan assets (32,531 ) 43,683 Effect of the liability ceiling — 157,774 Adjustment to the Defined Contribution Plan * (100,180 ) (61,582 ) Clearance Price * — (17,408 ) Pension plan assets at the end of year Ps. 2,438,724 Ps. 2,585,007 * The concepts come from the valuation of PMI CIM´s liabilities. The Labor Fund reduction was due to budgetary requirements derived from the need to meet a financial balance goal in cash flow. In this sense, during 2020 PEMEX’s administration implemented a strategy and the contributions to the Fund are scheduled and executed taking into account the initial balance plus the cost of payrolls and retirements for the year, maintaining a minimum operating balance without the operational continuity risk or payment to personnel. Contributions from PEMEX to FOLAPE include a promissory note for Ps. 4,983,670 (Ps. 4,102,622 of principal and Ps. 881,048 of interest) in the month of April derived from the Federal Government Contribution due to the Modification of the Pension Plan of Petróleos Mexicanos and its Subsidiary Entities. Interest income generated by the Government Bonds amounted Ps. 2,103,099 during 2020 of which Petróleos Mexicanos received the payment of Ps. 817,270. (see Note 15-A . Expected payments for fiscal year 2021 are Ps. 75,776,059. As of December 31, 2020 and 2019, the amounts and types of plan assets are as follows: December 31, Plan Assets 2020 2019 Cash and cash equivalents Ps. 10,845 Ps. 138,795 Debt instruments 2,427,879 2,446,212 Total plan assets Ps. 2,438,724 Ps. 2,585,007 December 31, Changes in Defined Benefit Obligations (DBO) 2020 2019 Defined benefit obligations at the beginning of the year Ps. 1,441,356,415 Ps. 1,074,233,038 Service costs 20,793,204 14,516,102 Financing costs 105,802,122 96,350,258 Past service costs — 77,045 Payments by the fund (68,295,593 ) (65,727,000 ) Actuarial (losses) gains due to: Change in financial assumptions 77,094,827 304,527,285 Change in demographic assumptions (18,581,935 ) (9,012,031 ) For experience during the year (41,069,054 ) 25,228,095 Obligations settled — (14,237 ) Reductions 34,789 (129,909 ) Modifications to the pension plan 1,949,427 1,307,769 Defined benefit obligations at the end of year Ps. 1,519,084,202 Ps. 1,441,356,415 The effects on the Defined Benefits Liability upon retirement and post-employment at the end of the period are: • The effect of an increase or decrease of one percentage point in the discount rate is a -12.25% • The effect of an increase or decrease of one percentage point in the increase rate in medical services with respect to the cost and obligations related to medical services point is a 3.23% increase or a -2.47% • The effect of an increase or decrease of one percentage point in the inflation is 9.58% and -8.08%, • The effect of an increase or decrease of one percentage point in the wage is a 1.37% and -1.20%, respectively in defined benefit obligations. The effects previously mentioned were determined using the projected unit credit method which was the same method used in the prior valuation. Assumptions regarding future mortality are based on EMSSA2009 to Unique Circular of the Comisión Nacional de Seguros y Fianzas PEMEX’s plan assets are held in the FOLAPE trusts, which are managed by BBVA Bancomer, S. A. and a technical committee for each trust that is comprised of personnel from Petróleos Mexicanos and the trusts. As of December 31, 2020, FOLAPE has a balance of Ps. 9,382, the remaining Ps. 2,429,342 belong to affiliate companies that are in charge of managing their own funds. The following tables present additional fair value disclosure about plan assets and indicate their rank, in accordance with IFRS 13, as of December 31, 2020 and 2019: Fair value measurements as of December 31, 2020 Plan assets Quoted prices in active markets for identical assets (level 1) Significant observable inputs (level 2) Significant unobservable inputs (level 3) Total Cash and cash equivalents Ps. 10,845 Ps. — Ps. — Ps. 10,845 Debt instruments 2,427,879 — — 2,427,879 Total Ps. 2,438,724 Ps. — Ps. — Ps. 2,438,724 Fair value measurements as of December 31, 2019 Plan assets Quoted prices in active markets for identical assets (level 1) Significant observable inputs (level 2) Significant unobservable inputs (level 3) Total Cash and cash equivalents Ps. 138,795 Ps. — Ps. — Ps. 138,795 Debt instruments 2,446,212 — — 2,446,212 Total Ps. 2,585,007 Ps. — Ps. — Ps. 2,585,007 As of December 31, 2020 and 2019, the principal actuarial assumptions used in determining the defined benefit obligation for the plans are as follows: December 31, 2020 2019 Rate of increase in salaries 4.47 % 5.02 % Rate of increase in pensions 4.00 % 4.00 % Rate of increase in post-mortem pensions 0.00 % 0.00 % Rate of increase in medical services 7.65 % 7.65 % Inflation assumption 4.00 % 4.00 % Rate of increase in basic basket for active personnel 5.00 % 5.00 % Rate of increase in basic basket for retired personnel 4.00 % 4.00 % Rate of increase in gas and gasoline 4.00 % 4.00 % Discount and return on plan assets rate (1) 7.08 % 7.53 % Average length of obligation (years) 17.52 17.52 (1) In accordance with IAS 19, the discount rate was determined using as a reference the interest rates observed in Mexican Government bonds denominated in pesos (Cetes and M bonds), as well as the flow of payments expected to cover contingent obligations. As a result of the performance in financial instruments mentioned above, the discount rate for 2020 had a decrease in respect to discount rate of 2019. Other long-term benefits Petróleos Mexicanos and the Subsidiary Entities have established other long-term benefit plans for their employees, to which employees do not contribute, which correspond to the seniority premiums payable for disability, death and survivor benefits (payable to the widow and beneficiaries of worker), medical service, gas and basic basket for beneficiaries. Benefits under these plans are based on an employee’s salary and years of service completed at separation date. Obligations and costs of such plans are recorded in accordance with actuarial valuations performed by independent actuaries. The amounts recognized for long-term obligations for the years ended December 31, 2020 and 2019 are as follows: December 31, Change in the liability for defined benefits 2020 2019 Liabilities defined benefit at the beginning of year Ps. 17,965,635 Ps. 13,224,926 Charge to income for the year 2,865,809 2,164,866 Actuarial losses (gains) recognized in income due to: Change in financial assumptions 912,673 5,007,261 Change in demographic assumptions (439,969 ) (245,829 ) For experience during the year (2,806,112 ) (2,418,954 ) Real interest, excluding earned interests * — 264,917 Effect of the liability ceiling * — (30,638 ) Adjustment to the Defined Contribution Plan * — (914 ) Benefits paid (979 ) — Liabilities defined benefit at the end of year Ps. 18,497,057 Ps. 17,965,635 * The concepts come from the valuation of PMI CIM´s liabilities. The expected long-term benefit payments amount to Ps. 359,746. The principal actuarial assumptions used in determining the defined benefit obligation for the plans are: • The effect of an increase or decrease of one percentage point in the discount rate is a -17.30% • The effect of an increase or decrease of one percentage point in the increase rate in medical services with respect to the cost and obligations related to medical services is a 8.53% increase or a -5.90%, • The effect of an increase or decrease of one percentage point in the inflation is a 0.40% increase or a -0.35% • The effect of an increase or decrease of one percentage point in the wage is a 4.51% increase or a -3.99% decrease, respectively in defined benefit obligations. The effects previously mentioned, were determined using the projected unit credit method which was the same used in the prior valuation. December 31, 2020 2019 Rate of increase in salaries 4.47 % 5.02 % Inflation assumption 4.00 % 4.00 % Rate of increase in basic basket for active personnel 5.00 % 5.00 % Rate of increase in basic basket for retired personnel 4.00 % 4.00 % Rate of increase in gas and gasoline 4.00 % 4.00 % Discount and return on plan assets rate 7.08 % 7.53 % Average length of obligation (years) 17.52 17.52 In accordance with IAS 19, the discount rate was determined using as a reference the interest rates observed in Mexican Government bonds denominated in pesos (Cetes and M bonds), as well as the flow of payments expected to cover contingent obligations. As a result of the performance in financial instruments mentioned above, the discount rate for 2020 had a decrease in respect to discount rate of 2019.

Provisions for Sundry Creditors

Provisions for Sundry Creditors	12 Months Ended
	Dec. 31, 2020
Text block [abstract]
Provisions for Sundry Creditors	NOTE 20. PROVISIONS FOR SUNDRY CREDITORS At December 31, 2020 and 2019, the provisions for sundry creditors and others is as follows: 2020 2019 Provision for plugging of wells (Note 13) Ps. 77,125,513 Ps. 80,849,900 Provision for trails in process (Note 27) 8,321,816 8,075,031 Provision for environmental costs 9,178,555 9,086,977 Ps. 94,625,884 Ps. 98,011,908 The following tables show the allowance account for plugging of wells, trials in progress and environmental costs: Plugging of wells 2020 2019 Balance at the beginning of the year Ps. 80,849,900 Ps. 84,050,900 (Decrease) Increase capitalized in fixed assets (12,816,336 ) (2,826,003 ) Unwinding of discount against income 4,555,692 3,318,384 Unrealized foreign exchange loss (gains) 4,766,921 (3,577,200 ) Amount used (230,664 ) (116,181 ) Balance at the end of the year Ps. 77,125,513 Ps. 80,849,900 Trials in progress 2020 2019 Balance at the beginning of the year Ps. 8,075,031 Ps. 6,483,078 Additions against expenses 972,692 1,901,930 Provision cancellation (724,026 ) (309,977 ) Amount used (1,881 ) — Balance at the end of the year Ps. 8,321,816 Ps. 8,075,031 Environmental costs 2020 2019 Balance at the beginning of the year Ps. Ps. Additions against expenses 1,669,063 4,745,835 Cancellation against expenses (1,574,810 ) (6,873,905 ) Amount used (2,675 ) (4,231 ) Balance at the end of the year (1) Ps. 9,178,555 Ps. 9,086,977 Provision for plugging of wells PEMEX records a provision at present value for the future plugging cost of an oil production facility or pipeline at the time that it is built. The plugging provision represents the present value of plugging costs related to oil and gas properties. These provisions have been created based on internal estimates of PEMEX. PEMEX has made certain assumptions based on the current economic environment that PEMEX believes provide a reasonable basis on which to estimate the future liability. These estimates are reviewed regularly to take into account any material changes in the assumptions. However, actual plugging costs in the long run will depend on future market prices for the necessary plugging work, which reflect market conditions at the time the work is being performed. The calculation of this provision considers the year-end The decrease in the provision in 2020 and 2019 against fixed assets corresponded to a decrease in the foreign exchange effect of direct costs reported (due to foreign exchange rates) in the current contracts for the plugging of wells, as well as decreases in the reserve limits and adjustments to the discount rate. This includes the effect of the discount rate over time of Ps. 4,555,692 and Ps. 3,318,348 for 2020 and 2019, respectively. The discount rate ranges used during 2020 and 2019 were from 3.268% to 7.799% and 3.279% to 6.960% for U.S. dollar denominated assets, respectively, and from 9.517% to 15.051% and 9.178% to 11.834% for peso denominated assets, respectively. Moreover, the time of plugging depends on when the fields cease to have economically viable production rates, which, in turn, depends on the inherently uncertain future prices of oil and gas. Well plugging of works will be carried out as follows: Year Amount 2021 Ps. 2,858,989 2022 2,197,972 2023 3,167,257 2024 3,456,396 2025 6,110,317 More than 5 years 59,334,582 Total Ps. 77,125,513 Provision for environmental costs PEMEX is subject to the provisions of the Ley General del Equilibrio Ecológico y la Protección al Ambiente Agencia Nacional de Seguridad Industrial y de Protección al Medio Ambiente del Sector Hidrocarburos

Income Taxes and Duties

Income Taxes and Duties	12 Months Ended
	Dec. 31, 2020
Text block [abstract]
Income Taxes and Duties	NOTE 21. INCOME TAXES AND DUTIES The Ley de Ingresos sobre Hidrocarburos Tax regime applicable to Assignments The tax regime applicable to the exploration and production for the assignments granted to PEMEX by the Mexican Government includes the following taxes and duties: A. Derecho por la Utilidad Compartida “DUC” (Profit-sharing Duty). As of January 1, 2015, Pemex Exploration and Production is obligated to pay a Profit-sharing Duty. As of January 1, 2020 and 2019, the applicable rate of this duty was 58% and 65%, respectively. The computation of this duty is based on the excess of the value of hydrocarbons produced during the fiscal year (including self-consumption, shrinkage and burning), minus certain permitted deductions by the Hydrocarbons Revenue Law, including part of the investments and some costs, expenses and duties. Pursuant to the Hydrocarbons Revenue Law, this duty has been decreased on an annual basis. As of January 1, 2021, this duty was set at 5 4 During 2020, this duty was Ps. 218,912,687 from annual payments presented on March 31, 2021 paid as follows: Ps. 153,292,899, in monthly installment payment and a tax credit of Ps. 65,000,000 and offset by a favorable balance of Ps. 149,715; resulting in a balance of Ps. 470,073 as of December 31, 2020. During 2019, this duty was Ps. 343,242,476 from annual payments presented on March 10, 2020 paid as follows: Ps. 347,515,447, in monthly installment payments, resulting in a favorable balance of Ps. 4,272,971, presented in accounts receivable, net line item in the statement of financial position. Duties and income tax paid as of December 31, 2020, 2019 and 2018 were Ps. 172,369,522, Ps. 347,515,447 and Ps. 443,785,240, respectively. The accounting result differs from the tax result mainly due to differences in depreciation, non-deductible Total DUC and other as of December 31, 2020, 2019 and 2018 are integrated as follows: 2020 2019 2018 DUC Ps. 218,912,687 Ps. 343,242,476 Ps. 443,294,170 Fiscal credit (65,000,000 ) — — DUC from prior years — (39 ) 14,883 Other — — 446,464 Deferred DUC expense 696,449 29,570,063 26,178,078 Total DUC and other Ps. 154,609,136 Ps. 372,812,500 Ps. 469,933,595 The principal factors generating the deferred DUC are the following: 2020 2019 Deferred DUC asset: Tax credits Ps. 572,796,156 Ps. 546,317,620 Deferred Profit-sharing duty liability: Wells, pipelines, properties, plant and equipment (208,999,954 ) (151,479,977 ) Deferred DUC asset net 363,796,202 394,837,643 Unrecognized Deferred DUC (355,374,599 ) (385,719,589 ) Net, deferred DUC asset Ps. 8,421,603 Ps. 9,118,054 The expected expense for DUC in 2020 was different from that which would result from applying the 58.0% rate to the tax base, as a result of the line items mentioned in the tables below. The expected expense for DUC in 2019 was different from that which would result from applying the 65.0% rate to the tax base, as a result of the line items mentioned in the next table. 2020 2019 2018 Expected (benefit) expense: Ps. (20,837,768 ) Ps. 43,432,712 Ps. 307,269,035 Increase (decrease) resulting from: Expected benefit contract (496,643 ) (4,948,542 ) (5,797,144 ) Duties from prior year — (26 ) 9,860 Non-cumulative (1) (2,291,937,519 ) (1,130,442,995 ) (593,158,584 ) Non-deductible (1) 2,313,271,930 1,091,958,851 291,676,831 Production value 321,353,133 495,394,906 610,206,103 Deductible duties (21,850,672 ) (39,891,325 ) (55,005,397 ) DUC tax credit (2) (65,000,000 ) — — Deferred DUC expense 696,449 29,570,063 26,178,078 Deductions cap (80,589,774 ) (112,261,105 ) (111,906,534 ) DUC from prior years — (39 ) 14,883 Other — — 446,464 DUC-Profit-sharing Ps. 154,609,136 Ps. 372,812,500 Ps. 469,933,595 (1) For 2020, fluctuations changes are included which have no effect on the determination of the DUC. (2) Corresponds to the tax credit granted by the Mexican Government on April 21, 2020. On August 18, 2017, the Official Gazette of the Federation published a decree, granting tax benefits for extraction activities in assignments with mature and / or marginal fields, substantially increasing the percentage of costs, expenses and investments that PEMEX could deduct for purposes of calculating the DUC. As a result, PEMEX received a tax benefit of Ps. 8,677,891 and Ps. 11,110,177, as of December 31, 2019 and 2018, respectively. Beginning January 1, 2020, this decree was derogated. On May 24, 2019, the Official Gazette of the Federation published a decree, granting tax benefits through the application of higher deduction limits on concepts such as costs, expenses and investments stated in the Hydrocarbons Revenue Law on the DUC assessment in assignments other than those applied in the previous paragraph. As a result, PEMEX received a tax benefit of Ps. 17,110,177 as of December 31, 2019. Beginning January 1, 2020, this decree was derogated. On April 21, 2020, the Mexican Government published a decree in the Official Gazette of the Federation, granting a tax benefit for the amount of Ps. 65,000,000 to PEMEX, which resulted in a decrease of PEMEX’s DUC payments. The tax benefit was granted due to the weakened financial environment due to changes in economic and business conditions resulting from geopolitical and economic events and the global health emergency caused by the Covid-19 pandemic. This decrease in the Profit-sharing Duty is incremental to the one resulting from the decrease of the rate from 65% to 5 8 B. Derecho de Extracción de Hidrocarburos (Hydrocarbons Extraction Duty). SHCP considers the effects of variations in the U.S. producer price index, or another alternative index, when it determines the rate to be published in the Official Gazette of the Federation. This duty is to be calculated using a rate based on a formula applicable to each type of hydrocarbon, the volume of production and utilizing the relevant market price for hydrocarbons in U.S. Dollars. During 2020 Pemex Exploration and Production made payments of Ps. 37,673,573, which are included in the cost of sales line item. C. Derecho de Exploración de Hidrocarburos (Exploration Hydrocarbons Duty). Pemex Exploration and Production as “assignee” must make monthly payments for this duty. The rates for 2020 were 1,396.09 pesos per square kilometer of non-producing During 2020, Pemex Exploration and Production made payments under this duty, totaling Ps. 1,068,598, which are included in the cost of sales line item. D. Impuesto por la actividad de Exploración y Extracción de Hidrocarburos (Exploration and Extraction Hydrocarbons Duty). The assignments granted by the Mexican Government create a tax on the exploration and extraction activities carried out in the corresponding area. The monthly tax paid during the exploration phase and until the extraction phase begins is 1,820.97 pesos per square kilometer. During the extraction phase of a project, a monthly tax of 7,283.92 pesos During 2020 payments for this tax amounted Ps. 4,288,716, which are included in the cost of sales line item. Tax Regime applicable to contracts: As of January 1, 2015, the tax regime applicable to Pemex Exploration and Production for contracts is set forth in the Hydrocarbons Revenue Law which regulates, among other things, the fiscal terms applicable to the exploration and extraction contracts (license, profit sharing contracts, production sharing and services) and sets duties and other taxes paid to the Mexican Government. The Hydrocarbons Revenue Law also establishes the following duties applicable to PEMEX in connection with assignments granted to it by the Mexican Government: • Cuota Contractual para la Fase Exploratoria (Exploration Phase Contractual Fee) During the exploration phase of an exploration and extraction contract, the Mexican Government is entitled to collect a monthly payment of 1,396.09 pesos per square kilometer of non-producing • Regalías (Royalties) Royalty payments to the Mexican Government are determined based on the “contractual value” of the relevant hydrocarbons, which is based on a variety of factors, including the type of underlying hydrocarbons (e.g., crude oil, associated natural gas, non-associated • Pago del Valor Contractual (Contractual Value Payment) Licensing contracts require a payment to the Mexican Government calculated as a percentage of the “contractual value” of the hydrocarbons produced, as determined by the SHCP on a contract-by-contract • Porcentaje a la Utilidad Operativa (Operating Profit Payment) Production-sharing contracts and profit-sharing contracts require a payment equivalent to a specified percentage of operating profits. In the case of production-sharing contracts, this payment shall be made in-kind • Bono a la Firma (Signing Bonus) Upon execution of a licensing contract, a signing bonus is to be paid to the Mexican Government in an amount specified by the SHCP in the relevant bidding terms and conditions or in the contracts resulting from a migration. • Impuesto por la actividad de Exploración y Extracción de Hidrocarburos (Hydrocarbons Exploration and Extraction Activities Tax) Contracts for exploration and extraction granted by the Mexican Government will include a specified tax on the exploration and extraction activities carried out in the relevant area. The monthly tax paid during the exploration phase and until the extraction phase begins is 1,820.97 pesos per square kilometer. During the extraction phase of a project, a monthly tax of 7,283.92 pesos per square kilometer is payable until the relevant contract for exploration and extraction or assignment is terminated. During 2020 payments for this tax amounted Ps. 204,293. Other applicable taxes The Subsidiary Entities are subject to the Income Tax Law and the Value Added Tax Law. Pemex Industrial Transformation is also subject to the Special Tax on Production and Services (IEPS Tax). 2020 indirect taxes are as listed below: A. IEPS Tax IEPS Sobre la Venta de los Combustibles Automotrices IEPS Beneficio de Entidades Federativas, Municipios y Demarcaciones Territoriales IEPS a los Combustibles Fósiles B. Value-Added Tax (“VAT”) For VAT purposes, final monthly payments are determined based on PEMEX’s cash flow, in accordance with the provisions of the Value Added Tax Law, applicable to payers of this tax. The general rate to be applied is 16%. Certain activities with incentives will have the rate of 0%. Beginning on January 1, 2019, a new Decree of fiscal incentives began to apply to the northern border region, which consisted of a credit equivalent to 50% of the general rate, applicable directly at the time of the sale or service. This incentive is applicable in 6 states in the northern border region and includes 43 municipalities in those states. Petróleos Mexicanos and its Subsidiary Entities apply this tax benefit to the operations they carry out within the municipalities of the States included in the Decree. VAT is applied to the sale of goods, the rendering of services, the granting of the temporary use of goods in the national territory and the importation of goods and services to the national territory. VAT taxpayers transfer VAT to their customers and are entitled to credit the VAT paid to their suppliers and on their imports. The net balance between VAT transferred to customers and paid to suppliers and on imports results each month in the VAT to be paid to the tax authorities or in an amount in favor of the taxpayer. The taxpayer has the right to credit VAT in favor against VAT payable in future months, to request a refund or to offset it against other payable federal taxes. Taxes on Income are described below: C. Income Tax As of January 1, 2015, Petróleos Mexicanos, the Subsidiary Entities and the Subsidiary Companies residing in Mexico for tax purposes are subject to the Income Tax Law. This tax is calculated by applying a rate of 30% to the tax result. Tax result is the excess of total revenues over the allowed deductions and tax losses from previous years. Accounting income differs from taxable income primarily due to the effects of inflation and differences between depreciation and other non-deductible For the years ended December 31, 2020, 2019 and 2018, Petróleos Mexicanos and its Subsidiary Companies incurred the following income tax expense (benefit): 2020 2019 2018 Current income tax Ps. 5,370,822 Ps. 4,247,998 Ps. 3,109,971 Deferred income tax 25,592,117 (33,237,009 ) (11,465,343 ) Total expense (benefit) income tax, net Ps. 30,962,939 Ps. (28,989,011 ) Ps. (8,355,372 ) As of December 31, 2020 and 2019, Pemex Exploration and Production and Pemex Industrial Transformation did not recognize deferred income assets of Ps. 743,263,723 and Ps. 647,629,937, respectively, due to their expectation that future tax income will not correspond to such benefits. These amounts are mainly from fiscal losses to be amortized amounting with an expiration year from 2026 to 2031. The principal factors generating the deferred income tax are the following: 2019 Recognized in Recognized 2020 Deferred income tax asset: Provisions Ps. 8,880,184 39,371 — 8,919,555 Employee benefits provision 68,290,356 4,451,358 (1,100,733 ) 71,640,981 Advance payments from clients 305,000 (116,717 ) — 188,283 Accrued liabilities 2,101,011 (419,649 ) — 1,681,362 Reserve due to depreciation of inventories 189,751 (189,751 ) — — Non-recoverable 709,328 (606,893 ) — 102,435 Derivative financial instruments 136,260 (94,525 ) — 41,735 Wells, pipelines, properties and equipment 8,071,570 (2,919,947 ) — 5,151,623 Tax loss carry-forwards (1) 38,427,643 (25,999,985 ) — 12,427,658 Total deferred income tax asset 127,111,103 (25,856,738 ) (1,100,733 ) 100,153,632 Deferred income tax liability: Wells, pipelines, properties, plant and equipment (1,614,704 ) 512,872 — (1,101,832 ) Other (2,062,031 ) (248,251 ) — (2,310,282 ) Total deferred income tax liability (3,676,735 ) 264,621 — (3,412,114 ) Net long-term deferred income tax asset Ps. 123,434,368 (25,592,117 ) (1,100,733 ) 96,741,518 2018 Recognized in Recognized in OCI 2019 Deferred income tax asset: Provisions Ps. 8,836,693 Ps. 43,491 Ps. — Ps. 8,880,184 Employee benefits provision 40,314,749 17,362,550 10,613,057 68,290,356 Advance payments from clients 35,807 269,193 — 305,000 Accrued liabilities 611,652 1,489,359 — 2,101,011 Reserve due to depreciation of inventories 982,228 (792,477 ) — 189,751 Non-recoverable 763,924 (54,596 ) — 709,328 Derivative financial instruments 29,674 106,586 — 136,260 Wells, pipelines, properties and equipment 11,862,776 (3,791,206 ) — 8,071,570 Tax loss carry-forwards (1) 20,659,110 17,768,533 — 38,427,643 Total deferred income tax asset 84,096,613 32,401,433 10,613,057 127,111,103 Deferred income tax liability: Wells, pipelines, properties, plant and equipment (2,630,597 ) 1,015,893 — (1,614,704 ) Other (1,881,715 ) (180,316 ) — (2,062,031 ) Total deferred income tax liability (4,512,312 ) 835,577 — (3,676,735 ) Net long-term deferred income tax asset Ps. 79,584,301 Ps. 33,237,010 Ps. 10,613,057 Ps. 123,434,368 (1) Tax loss carryforwards expire in 2030. Expense attributable to the profit (loss) from continuing operations before income taxes was different from that which would result from applying the 30% rate to profit, as a result of the items listed below: For the years ended December 31, 2020 2019 2018 Expected income tax expense Ps. 28,835,256 Ps. 3,707,023 Ps. (41,316,168 ) Increase (decrease) resulting from: Tax effect of inflation-net 5,694,637 6,487,844 11,742,346 Fiscal updating of pipelines, properties and equipment (161,883 ) (5,290,734 ) (3,359,548 ) Unrecognized Deferred tax asset (1) — — 21,885,731 Cancellation of tax credits — (24,189,922 ) — Retirement benefits (8,206,693 ) (10,698,848 ) — Non-deductible 2,405,635 4,826,745 1,781,012 Others-net 2,395,987 (3,831,120 ) 911,255 Income tax expense (benefit), net Ps. 30,962,939 Ps. (28,989,012 ) Ps. (8,355,372 ) (1) Due to the fact that the circumstances to evaluate the recovery of the tax benefit from pending tax losses to be amortized in Pemex Logistics improved in 2019, a deferred asset was recognized. As of December 31, 2020 and 2019, the net accumulated effect of actuarial gains and losses on deferred tax was Ps. 18,246,952 and Ps. 19,347,685, respectively. In addition, as of December 31, 2020 and 2019, the deferred tax effect of actuarial gains and losses is presented in comprehensive (loss) income in the amounts of Ps. (1,100,733) and Ps.10,613,057, respectively.

Equity (Deficit)

Equity (Deficit)	12 Months Ended
	Dec. 31, 2020
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Equity (Deficit)	NOTE 22. EQUITY (DEFICIT) A. Certificates of Contribution “A” The capitalization agreement between Petróleos Mexicanos and the Mexican Government states that the Certificates of Contribution “A” constitute permanent capital. On August 5, 2016, the Mexican Government issued Ps. 184,230,586 in exchange for a Ps. 50,000,000 non-negotiable 15-A). On September 11, 2019, Petróleos Mexicanos received Ps. 122,131,000 in Certificates of Contribution “A” from the Mexican Government to help improve PEMEX’s financial position. During 2020, Petróleos Mexicanos received Ps. 46,256,000 in Certificates of Contribution “A” from the Mexican Government to help improve PEMEX’s financial position. PEMEX’s Certificates of Contribution “A” are as follows: Amount Certificates of Contribution “A” as of December 31, 2018 Ps. 356,544,447 Increase in Certificates of Contribution “A” during 2019 122,131,000 Certificates of Contribution “A” as of December 31, 2019 Ps. 478,675,447 Increase in Certificates of Contribution “A” during 2020 46,256,000 Certificates of Contribution “A” as of December 31, 2020 Ps. 524,931,447 B. Mexican Government contributions During 2020 and 2019 there were no Mexican Government contributions apart from Certificates of Contribution “A”. C. Legal reserve Under Mexican law, each of the Subsidiary Companies is required to allocate a certain percentage of its net income to a legal reserve fund until the fund reaches an amount equal to a certain percentage of each Subsidiary Company’s capital stock. During 2020 and 2019, there were no changes to the legal reserve. D. Accumulated other comprehensive income (loss) As a result of the discount rate analysis related to employee benefits liability, for the periods ended December 31, 2020 and 2019 PEMEX recognized net actuarial losses in other comprehensive income (loss) net of deferred income tax for Ps. (19,178,587) and Ps (309,334,500), respectively, related to retirement and post-employment benefits as a result of a decrease in the discount rates. The variation related to retirement and post-employment benefits was the result of a decrease in the discount and return on plan assets rates from 7.53% as of December 31, 2019 to 7.08% as of December 31, 2020. E. Accumulated deficit from prior years PEMEX has recorded negative earnings in the past several years. However, the Ley de Concursos Mercantiles F. Uncertainty related to going concern The consolidated financial statements have been prepared on a going concern basis. Facts and conditions PEMEX also has substantial debt, incurred mainly to finance the capital expenditures needed to carry out its capital investment projects and to fund its operating expenses. Due to its heavy fiscal burden resulting from the payment of hydrocarbon extraction duties and other taxes, the cash flows derived from PEMEX’s operations in recent years have not been sufficient to fund its operations and capital expenditure programs. As a result, PEMEX’s indebtedness has increased significantly, and its working capital has deteriorated. In recent years, PEMEX’s level of indebtedness relative to its oil reserves has increased substantially. Additionally, the significant crude oil price drop, which started in March 2020, PEMEX’s continued heavy tax burden, increased competition from the private sector and the negative economic impact as a result of the current global health crisis caused by the Covid-19 In March and April 2020, certain ratings agencies downgraded PEMEX’s credit rating. Most recent credit downgrades have been mainly driven by the effects of Covid-19 During 2020, 2019 and 2018, PEMEX recognized a net loss of Ps. 509,052,065, Ps. 282,112,024 and Ps. 180,419,837, respectively. In addition, as of December 31, 2020 and 2019, PEMEX had a negative equity of Ps. 2,404,727,030 and Ps. 1,931,409,302, respectively, mainly due to continuous net losses, and a negative working capital of Ps. 442,550,332 and Ps. 209,168,587, as of December 31, 2020 and 2019, respectively. PEMEX has budget autonomy, and, in public finance terms, is subject to the cash flows financial balance goals approved in the Decreto de Presupuesto de Egresos de la Federaci ó n C á mara de Diputados PEMEX has short-term debt principal maturities (including interest payable) of Ps. 391,097,267, as of December 31, 2020. The combined effect of the above-mentioned events indicates the existence of significant doubt about PEMEX’s ability to continue as a going concern. Actions- PEMEX and the Mexican Government are carrying out the following actions, among others, to preserve liquidity: PEMEX was granted a tax credit applicable to the Profit-sharing Duty of up to Ps. 73,280,000 pursuant to the presidential decree of the Mexican Government of February 19, 2021 (see note 28). As of March 31, 2020, PEMEX has applied Ps. 18,320, 0 It is expected that PEMEX will receive scheduled equity contributions from the Mexican Government during 2021, through the Ministry of Energy for Ps. 96,720,000, of which as of May 7, 2021 Ps. 64,124,000, have been received. The resources from these contributions will be used for short-term maturities of long-term debt will not affect PEMEX’s compliance with its financial balance goal established for 2021 (see Note 28). It is expected that PEMEX will be subject to a lower tax burden in 2021, since the share-profit duty decreased to 54% in 2021 from 58% in 2020. PEMEX has Ps. 190,604,990 (U.S. $7,700,000 and Ps. 37,000,000) in available credit lines in order to provide liquidity, if necessary. As of December 31, 2020, PEMEX had used Ps. 71,815,320 (U.S. $3,600,000 of its lines of credit denominated in U.S. dollars) and had a total availability of Ps. 74,902,530 (U.S. $1,900,000 and Ps. 37,000,000) remaining under its credit lines. Revenues from alternative financing mechanisms that do not constitute public debt. In addition, PEMEX may raise funds from the markets in accordance with prevailing conditions, to refinance its debt. Further, PEMEX has the capacity to refinance its short-term debt maturities through direct loans and revolving credit facilities and loans guaranteed by export credit agencies. PEMEX also established in conjunction with development and commercial banks Cadenas Productivas PEMEX Plus The Ley de Ingresos de la Federación para el Ejercicio Fiscal de 2021 PEMEX reviews and aligns its capital expenditures portfolio in accordance with updated economic assumptions on a periodic basis and giving priority to those projects which increase production in an efficient manner and at the lowest cost. Further, on March 2 2 Prices of crude oil, natural gas and petroleum products have begun to recover in the first months of 2021, and economic activity has begun to increase. Petróleos Mexicanos and its Subsidiary Entities are not subject to the Commercial Bankruptcy Law of Mexico and none of PEMEX’s existing financing agreements include any financial covenants that could lead to the demand for immediate payment of its debt due to having negative equity or non-compliance PEMEX prepared its consolidated financial statements as of December 31, 2020 and 2019 on a going concern basis. There are certain conditions that have generated important uncertainty and significant doubts concerning the entity’s ability to continue operating, including recurring net losses, negative working capital and negative equity. These financial statements do not contain any adjustments that would be required if they were not prepared on a going concern basis. G. Non-controlling PEMEX does not currently own all of the shares of PMI CIM and COMESA, variations in income and equity from these entities are also presented in the consolidated statements of changes in equity (deficit) as “non-controlling Until April 2020, the non-controlling PMI HBV’s payment of the guarantee gave a right of recovery that becomes a participatory loan for HJ BARRERAS. As of the payment, the expiration period of the options for the purchase and sale of the shares between the two parties may take place on January 1, 2022, or earlier when the construction of that vessel is completed. Therefore, as of May 2020, PMI HBV. does not maintain control over HJ BARRERAS and Petróleos Mexicanos does not consolidate HJ BARRERAS’ financial information in its financial statements. As of April 30, 2020, HJ BARRERAS’ total assets amounted to Ps.1,558,000; total liabilities amounted to Ps. 2,945,300, respectively; and negative capital (of which 49.0% corresponded to non-controlling non-controlling On July 31, 2020, Cruise Yacht Yard Co, Ltd exercised its purchase and sale option. As of December 31, 2020 and 2019, non-controlling

Cost and Expenses by Nature

Cost and Expenses by Nature	12 Months Ended
	Dec. 31, 2020
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Cost and Expenses by Nature	NOTE 23. COST AND EXPENSES BY NATURE Cost and expenses by nature for each of the years ended December 31, 2020, 2019 and 2018, was as follows: 2020 2019 2018 Purchases Ps. 386,040,047 Ps. 600,657,759 Ps. 756,867,203 Depreciation of wells, pipelines, properties, plant and equipment, depreciation of rights of use and amortization of intangible assets 137,398,830 145,159,657 153,382,040 Net periodic cost of employee benefits 128,808,540 116,176,949 114,621,614 Personnel services 103,044,657 101,252,318 104,284,007 Conservation and maintenance 69,939,632 65,640,388 48,562,536 Exploration and Extraction Hydrocarbons Duty and taxes 43,593,642 67,106,181 88,145,519 Other operation costs and expenses 25,031,177 12,711,674 16,672,534 Unsuccessful wells 22 ,269,583 79,595,185 15,443,086 Raw materials and spare parts 18,381,313 22,729,422 16,850,075 Auxiliary services with third-parties 15,901,982 19,492,638 23,675,019 Other operation taxes and duties 12,180,579 12,764,473 12,248,474 Exploration expenses 6,732,689 10,942,558 13,048,078 Insurance 6,068,497 5,821,020 5,647,101 Integrated Contracts 5,275,946 9,947,983 8,015,606 Losses from fuels subtraction (1) 4,279,542 4,644,846 39,439,107 Freight 3,426,079 3,197,421 3,525,843 Inventory variations 2,572,641 1,063,678 (62,237,591 ) Total cost of sales and general expenses Ps. 990,945,376 Ps. 1,275,588,157 Ps. 1,358,190,251 (1) In accordance with Resolution RES / 179/2017, issued by the CRE, losses from fuels subtraction are losses outside the scope of the contemplated operating costs as a result of various illicit actions, including the theft of and illicit market in fuels. Pemex Logistics is responsible for distributing hydrocarbons through the pipelines and for the received products, preserving their quality and delivering them from the point of reception to the user at the point of destination. Pemex Logistics determines the volume of missing hydrocarbons through monthly calculations.

Other Revenues and Other Expens

Other Revenues and Other Expenses	12 Months Ended
	Dec. 31, 2020
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Other Revenues and Other Expenses	NOTE 24. OTHER REVENUES AND OTHER EXPENSES Other revenues and expenses-net a) Other revenues 2020 2019 2018 Other Ps. 3,551,636 Ps. 3,418,551 Ps. 7,525,714 Revenues from reinsurance premiums 2,534,466 4,869,266 3,615,907 Other income for services 2,420,939 1,994,572 3,786,253 Claims recovery 1,515,295 2,687,258 3,979,698 Bidding terms, sanctions, penalties and other 1,170,632 1,503,437 630,365 Franchise fees 494,785 389,730 1,125,339 Gain on sale of fixed assets 50,215 77,633 1,850,052 Participation rights (1) 30,878 — 14,165,042 Sale of fixed assets by bidding (2) — — 3,301,653 Price of sale share — — 1,262,987 Cash distributions — — 274,621 Total other revenues Ps. 11,768,846 Ps. 14,940,447 Ps. 41,517,631 b) Other expenses 2020 2019 2018 Other Ps. (436,723 ) Ps. (4,602,210 ) Ps. (5,348,666 ) Claims (376,697 ) (173,414 ) (474,299 ) Disposal of assets (351,010 ) (2,413,776 ) (12,600,191 ) Transportation and distribution of natural gas (30,284 ) (22,291 ) (41,964 ) Total other expenses Ps. (1,194,714 ) Ps. (7,211,691 ) Ps. (18,465,120 ) (1) Relates to rights participate of EECs, for which the operators of the EECs guarantee their participation in such contracts. (2) Relates mainly to exploration and production fixed assets.

Related Parties

Related Parties	12 Months Ended
	Dec. 31, 2020
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Related Parties	NOTE 25. RELATED PARTIES The balances and transactions with related parties are mainly due to: (i) the sale and purchase of products, (ii) the billing of administrative services, and (iii) financial loans between related parties. Directors and employees of Petróleos Mexicanos and the Subsidiary Entities are subject to regulations related to conflict of interest such as the Petróleos Mexicanos Law, Ley Federal de Responsabilidades Administrativas de los Servidores Públicos Políticas y Lineamientos Anticorrupción para Petróleos Mexicanos, sus Empresas Productivas Subsidiarias y, en su caso, Empresas Filiales ( Related parties include individuals and companies that do not form part of PEMEX, but that could take advantage of being in a privileged position as a result of their relation with PEMEX. Also included are situations in which PEMEX could take advantage of a special relationship in order to benefit its financial position or results of operations. Main operations identified by PEMEX with this kind of directors and officers are as follows: Mr. Manuel Bartlett Díaz, Chief Executive Officer of CFE, was appointed member of the Board of Directors of Petróleos Mexicanos in December 2018. CFE has executed several purchase agreements with Pemex Industrial Transformation. During 2020, CFE acquired the following products from Pemex Industrial Transformation: Product 2020 Heavy fuel oil Ps. 6,258,996 Industrial diesel 3,426,200 Fuel oil 456,960 Transport of Natural Gas 364,512 Other 303,278 Natural Gas 263,993 Freights 189,983 Total Ps. 11,263,922 As of December 31, 2020, CFE owed Pemex Industrial Transformation a total amount of Ps. 1,509,057. Invoices are payable between 30 and 60 days. A. Compensation of Directors and Officers For the years ended December 31, 2020, 2019 and 2018, short-term benefits of executive officers of Petróleos Mexicanos and the Subsidiary Entities paid or accrued in that year for services in all capacities was approximately Ps. 30,988, Ps. 30,988 and Ps. 51,188, respectively. Retirement , As of December 31, 2020 2019 2018 Retirement Ps. 7,233 15,549 12,403 Post-employment 354 349 782 Long-term 3,702 2,698 3,312 Ps. 11,289 18,596 16,497 Except in the case of the professional members, members of the Boards of Directors of Petróleos Mexicanos and the Subsidiary Entities do not receive compensation for their services. The compensation paid or accrued during 2020, 2019 and 2018, to the professional members of the Board of Directors of Petróleos Mexicanos and boards of directors of the existing Subsidiary Entities was approximately Ps. 6,008, Ps. 5,985 and Ps. 8,878, respectively. B. Compensation and benefits As an employee benefit, PEMEX offers salary advances to all of its eligible Petroleum Workers’ Union and non-union Reglamento de Trabajo del Personal de Confianza de Petróleos Mexicanos y Empresas Productivas Subsidiarias non-interest

Commitments

Commitments	12 Months Ended
	Dec. 31, 2020
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Commitments	NOTE 26. COMMITMENTS A. PMI CIM has entered into several contracts for the sale of crude oil on the international market to foreign companies. The terms and conditions of these contracts are specific to each client, and their durations may be indefinite (evergreen contracts) or they may contain a minimum obligatory period (long-term contracts). B. PEMEX has entered into a nitrogen supply contract for the pressure maintenance program at the Cantarell complex. During 2007, an additional contract was entered into with the purpose of supplying nitrogen to the Ku-Maloob-Zap Estimated future payments under this contract for upcoming fiscal years are as follows: 2021 Ps. 4,774,522 2022 4,863,254 2023 5,008,700 2024 5,042,333 2025 5,039,959 2026 and thereafter 7,531,611 Total Ps. 32,260,379 C. As of December 31, 2020, PEMEX had entered into FPWCs by means of which the contractor manages and is responsible for financing performance of the work to be undertaken. As of December 31, 2020 and 2019, the estimated value of these contracts was as follows: Maturity 2020 2019 Up to 1 year Ps. 1,046,436 Ps. 1,251,543 1 to 3 years 1,339,040 1,610,152 4 to 5 years 376,916 426,886 Total Ps. 2,762,392 Ps. 3,288,581 D. As of December 31, 2020 and 2019, the estimated value of the contracts that PEMEX has entered into with several contractors for the development of various infrastructure and services works was as follows: Maturity 2020 2019 Up to 1 year Ps. 39,162,033 Ps. 104,584,602 1 to 3 years 274,421,535 325,674,623 4 to 5 years 23,055,268 43,984,437 More than 5 years 37,518,571 147,488,082 Total Ps. 374,157,407 Ps. 621,731,744

Contingencies

Contingencies	12 Months Ended
	Dec. 31, 2020
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Contingencies	NOTE 27. CONTINGENCIES In the ordinary course of business, PEMEX is named in a number of lawsuits of various types. PEMEX evaluates the merit of each claim and assesses the likely outcome. PEMEX has not recorded provisions related to ongoing legal proceedings due to the fact that an unfavorable resolution is not expected in such proceedings, with the exception of the proceeding described in further detail in this Note. PEMEX is involved in various civil, tax, criminal, administrative, labor and commercial lawsuits and arbitration proceedings. The results of these proceedings are uncertain as of the date of these consolidated financial statements. As of December 31, 2020, and December 31, 2019, PEMEX had accrued a reserve of Ps. 8,321,816 and Ps. 8,075,031, respectively, for these contingent liabilities. As of December 31, 2020, the current status of the principal lawsuits in which PEMEX is involved is as follows: • On April 4, 2011, Pemex Exploration and Production was summoned before the Séptima Sala Regional Metropolitana Tribunal Federal de Justicia Fiscal y Administrativa 4957/11-17-07-1) 13620/15-17-06) Sexta Sala Regional Metropolitana Tercer Tribunal Colegiado en Materia Administrativa del Primer Circuito • On December 12, 2017, Pemex Exploration and Production was summoned in connection with an arbitration claim (no. 23217/JPA) filed by SUBSEA 7 de México, S. de R. L. de C.V. (“SUBSEA 7”) seeking U.S. $153,000 related to additional expenses in connection with pipelines construction contracts (No. 420832856 and 420833820). On January 5, 2018, Pemex Exploration and Production filed a response to the arbitration request and its counterclaim. On September 14, 2018, the defendant received the claim briefs including documentation and related evidence and the amount sought under this claim was increased to U.S. $310,484. On January 4, 2019, Pemex Exploration and Production filed a response to the claim. On February 14, 2019, SUBSEA 7 filed its reply. In June 2019, a hearing was held and on October 4, 2019 the parties filed their pleadings. The final award was issued on July 28, 2020, and notice was provided on July 30, 2020. Pemex Exploration and Production was ordered to pay U.S. $34,576 and Ps. 70,668. As of the date of these financial statements, the execution of this resolution is still pending. • On August 1, 2017, Pemex Exploration and Production was summoned in connection with an administrative claim (no. 11590/17-17-06-2) Segunda Sección de la Sala Superior Décimo Primer Tribunal Colegiado en Materia Administrativa • On February 6, 2019, the Sala Regional del Golfo Norte (752/17-18-01-7) Gaceta Judicial ”) • On October 18, 2019, the Sala Regional Peninsular Tribunal Federal de Justicia Administrativa (91/19-16-01-9) • Tech Man Group, S.A. de C.V. filed an administrative claim (7804/18-17-09-8) (CO-OF-019-4008699-11) • Constructora Norberto Odebrecht, S.A. filed an administrative claim against Pemex Industrial Transformation (file No. 4742/19-17-01-7) The results of these proceedings are uncertain until their final resolutions are issued by the appropriate authorities. PEMEX has recorded liabilities for loss contingencies when it is probable that a liability has been incurred and the amount thereof can be reasonably estimated. When a reasonable estimation could not be made, qualitative disclosure was provided in the notes to these consolidated financial statements. PEMEX does not disclose amounts accrued for each individual claim because such disclosure could adversely affect PEMEX’s legal strategy, as well as the outcome of the related litigation. Pursuant to an ordinary session held by the Board of Directors on August 23, 2013, Petróleos Mexicanos established policies for the granting of mutual guarantees, loans or any type of credit in favor of the Subsidiary Entities and Subsidiary Companies; in accordance with these policies, the Corporate Finance Department issues an opinion with its risk analysis, financial valuation, budget sufficiency, accounting treatment and conclusions. Additionally, Pemex Logistics has granted the following corporate guarantees in connection with the exploration and extraction contracts entered into by Pemex Exploration and Production, as required by the CNH: • Exploration and extraction of hydrocarbons under the deep-water license modality, Trión field (Tender CNH-A1-TRION • Exploration and extraction of the contract area 3 Cinturón plegado perdido (Tender CNHR01- L04 / 2015), of U.S. $3,333,000. • Extraction of hydrocarbons under shared production contract of the Ek-Balam • Extraction of hydrocarbons in contractual area Santuario and El Golpe 3 field, of U.S. $320,000. • Exploration and extraction of hydrocarbons under shared production contract, contractual area 2 Tampico-Misantla, of U.S. $1,250,000. • Exploration and extraction of hydrocarbons under shared production contract, contractual area 8 Cuencas del Sureste, of U.S. $1,250,000. • Exploration and extraction of hydrocarbons shared production contract, assignment AE-0398-Mission • Extraction of hydrocarbons under license agreement, Ogarrio field of U.S. $250,000. • Extraction of hydrocarbons under license agreement, Cárdenas and Mora fields, of U.S. $250,000. • Exploration and extraction of hydrocarbons under the deep-water license modality, contractual area 2 Perdido, of U.S. $2,500,000. • Exploration and extraction of hydrocarbons under the deep-water license modality, contractual area 5 Perdido, of U.S. $5,000,000. • Exploration and extraction of hydrocarbons under the deep-water license modality, contractual area 18 Cordilleras Mexicanas, of U.S. $5,000,000. • Exploration and extraction of hydrocarbons under shared production contract contractual area 22 Cuenca Salina, of U.S. $1,375,000. • Contractual area 16 Tampico-Misantla, Veracruz, of U.S. $1,000,000. • Contractual area 17 Tampico-Misantla, Veracruz, of U.S. $1,000,000. • Contractual area 18 Tampico-Misantla, Veracruz, of U.S. $2,000,000. • Contractual area 29 Cuencas del Sureste, of U.S. $2,500,000. • Contractual area 32 Cuencas del Sureste, of U.S. $1,250,000. • Contractual area 33 Cuencas del Sureste, of U.S. $1,250,000. • Contractual area 35 Cuencas del Sureste, of U.S. $1,250,000. • Contractual area Ébano, of U.S. $225,000. • Contractual area AE-0388-M-Miquetla non-conventional on-shore Certain other Subsidiary Entities have also granted guarantees and other contingencies. Total guarantees granted to Pemex Exploration and Production amounted to U.S. $40,503,000, equivalent to Ps. 807,982,196, as of December 31, 2020. As of December 31, 2020, Pemex Logistics granted to Pemex Industrial Transformation the obligations from a lease contract for U.S. $150,000, equivalent to Ps. 2,992,305 at the closing exchange rate on December 31, 2020, of Ps. 19.9487 = U.S. $1.00, to J. Aron & Company LLC, a subsidiary of Goldman Sachs Group Inc. PEMEX considers the probability it needs to make a disbursement of cash, for the guarantees granted and in effect as of December 31, 2020 remote.

Subsequent Events

Subsequent Events	12 Months Ended
	Dec. 31, 2020
Text block [abstract]
Subsequent Events	NOTE 28. SUBSEQUENT EVENTS A. Indebtedness for 2021 The Revenue Law for 2021, which will be applicable to PEMEX as of January 1, 2021, permits the incurrence of up to Ps. 42,100,000 (Ps. 22,000,000 and U.S. $1,000,000) of net indebtedness through a combination of domestic and international capital markets offerings and borrowings from domestic and international financial institutions. B. Recent financing activities As of December 31, 2020, the outstanding amount in PMI Trading revolving credit lines was U.S. $2,387,065. Between January 1, 2021 to May 11, 2021, PMI Trading obtained U.S. $19,259,325 and repaid U.S. $19,367,412 in financing from its revolving credit lines. As of May 1, 2021, the outstanding amount under these revolving credit lines was U.S. $2,278,978. As of May 11, 2021, Petróleos Mexicanos had U.S. $5,500,000 and Ps. 37,000,000 in available revolving credit lines in order to provide liquidity, with U.S. $70,000 and Ps. 24,500,000 remaining available. During the period from January 1 to May 11, 2021, we participated in the following activities: • On January 22, 2021, Petróleos Mexicanos issued Ps. 2,500,000 of promissory notes due 2021 at a rate linked to the six-months • On January 22, 2021, Petróleos Mexicanos issued Ps. 4,000,000 of promissory notes due 2021 at a rate linked to the six-months • On January 22, 2021, Petróleos Mexicanos entered into a credit line for the amount of U.S. $152,237 due January 2031, linked to one-year LIBOR + 1.38%, and adjusted every six-months. • On March 23, 2021, we issued Ps. 2,000,000 promissory notes due in June 2021, at a rate linked to the TIIE plus 238 basis points. The original maturity of the promissory notes was May 2021. • On April 13, 2021, we issued Ps. 1,500,000 promissory notes due in July 2021, at a rate linked to the TIIE plus 215 basis points. • On April 22, 2021, we issued Ps. 4,000,000 promissory notes due in October 2021, at a rate linked to the TIIE plus 248 basis points. The original maturity of the promissory notes was July 2021. C. Decrease in the price of refined products As a result of the economic slowdown and the consumption of refiners (gasolines, turbosins, diesel and others), a 13.7% decrease in sales is estimated during the period from January 1 to May 11, 2021, compared to the same period of 2020. D. Exchange rates and crude oil prices As of May 11, 2021, the Mexican peso-U.S. As of May 11, 2021, the weighted average price of the crude oil exported by PEMEX was U.S. $62.43 per barrel. This represents a price increase of approximately 32% as compared to the average price as of December 31, 2020, which was U.S. $47.16 per barrel. E. Merger of Pemex Fertilizers On December 2, 2020, the Board of Directors of Petróleos Mexicanos approved the merger of Pemex Industrial Transformation and Pemex Fertilizers. Effective as of January 1, 2021 Pemex Industrial Transformation will remain as merging company and Pemex Fertilizers became extinct as a merged company. On January 27, 2021, the Declaration of Extinction of Pemex Fertilizers, as a result of its merger with Pemex Industrial Transformation, was published in the Official Gazette of the Federation, effective January 1, 2021. The Declaration of Extinction of Pemex Fertilizers will not affect any payment obligations previously executed by Pemex Fertilizers, in Mexico and abroad, in which Pemex Industrial Transformation is subrogated due to the above-mentioned merger. F. Contributions from the Mexican Government On February 19, 2021, the Mexican Government published in the Official Gazzete of the Federation a presidential decree, granting the application of a tax credit applicable to the Profit-sharing Duty in the amount of Ps. 73,280,000. During 2021, the Mexican Government made the following contributions to Petróleos Mexicanos through the Ministry of Energy in order to support PEMEX’s finances: Amount January 22, 2021 (i) Ps. 12,000,000 February 11, 2021 (i) 10,000,000 February 24, 2021 (ii) 32,062,000 March 5, 2021 (i) 7,000,000 March 26, 2021 (i) 2,000,000 April 5, 2021 (i) 5,000,000 April 26, 2021 (i) 2,050,000 May 3, 2021 (i) 7,000,000 May 4, 2021 (ii) 32,062,000 Total Ps. 109,174,000 (i) Capital contributions to the construction of the Dos Bocas Refinery. (ii) Capital contributions to debt’s payments. G. Business Plan 2021-2025 On March 2 2 The 2021-2025 Business Plan continues to focus on initiatives emphasized in the 2019-2023 Business Plan, including recovering crude oil and natural gas production, focusing exploration and production activities on land basins and shallow waters and, with respect to oil and petrochemical production, constructing the new refinery in Dos Bocas, Tabasco. In addition, the 2021-2025 Business Plan continues to focus on the rehabilitation of the National Refining System and the strengthening of PEMEX’s ethylene production, its derivatives production and its fertilizer business. The 2021-2025 Business Plan reaffirms the strategic vision of the previous 2019-2023 Business Plan regarding the recovery of PEMEX’s financial capacity and the productivity of its value chain but makes adjustments to its strategies in light of the challenges of the current global environment. While the 2019-2023 Business Plan adjusts PEMEX’s strategies and goals and extends the time period contemplated, it reinforces PEMEX’s focus on financial discipline and cost reduction measures, including as related to its investments and maintenance of its portfolio. The 2021-2025 Business Plan has three main objectives: • Financial optimization • Sustainability • Efficiency and competitiveness PEMEX’s main objectives in the 2021-2025 Business Plan is to strengthen its finances and ensure the availability of financial resources for investment projects. PEMEX aims to identify the financial resources available for investments and to work to efficiently allocate resources to projects according to their profitability and the priorities of the Mexican Government. H. MEXICAN GOVERNMENT BONDS Income interest generated by the Government Bonds amounted Ps. 2,311,338 from January 1 to April 30, 2021, of which Petróleos Mexicanos received the payment of Ps. 2,492,147. I. LEGAL PROCEEDINGS On January 29, 2021, Petróleos Mexicanos and its Subsidiary Entities filed an amparo (124/2021) before the Twelfth District Court in Ciudad Victoria, Tamaulipas against the Congress of the state of Tamaulipas and nine other authorities in response to a request for rights to payments related to atmospheric emissions in the amount of Ps. 2,863,050. On February 4, 2021, the amparo was admitted and a provisional suspension was granted. On March 2, 2021, a constitutional hearing was scheduled. On February 18, 2021, a definitive suspension was granted. On February 22, 2021, the partial gas emission test offered by Petróleos Mexicanos and its Subsidiary Entities was reserved. On February 24, 2021, the governor and the secretary general of government of the state of Tamaulipas filed a justified report. On March 2, 2021, the constitutional hearing was postponed to March 30, 2021. On March 17, 2021, the president of the state congress filed a justified report. On March 29, 2021, evidence was offered by Petróleos Mexicanos and its Subsidiary Entities. On March 31, 2021, the constitutional hearing was postponed to April 29, 2021. As of the date of these financial statements, the final resolution is pending.

New Standards Recently Issued

New Standards Recently Issued	12 Months Ended
	Dec. 31, 2020
Text block [abstract]
New Standars Recently Issued	NOTE 29. NEW STANDARDS RECENTLY ISSUED A number of new standards are effective for annual periods beginning after January 1, 2021 and earlier application is permitted; however, PEMEX has not early adopted the new or amended standards in preparing these consolidated financial statements. The following amended standards and interpretations are not expected to have a significant impact on the PEMEX’s consolidated financial statements. A. Interest Rate Benchmark Reform – Phase 2 (Amendments to IFRS 9, IAS 39, IFRS 7, IFRS 4 and IFRS 16) The amendments address issues that might affect financial reporting as a result of reforms to IBOR interest rate benchmarks, including the effects of changes to contractual cash flows or hedging relationships arising from the replacement of IBOR interest rate benchmarks with alternative benchmark rates. The amendments provide practical relief from certain requirements in IFRS 9, IAS 39, IFRS 7, IFRS 4 and IFRS 16 relating to: • changes in the basis for determining contractual cash flows of financial assets, financial liabilities and lease liabilities; and • hedge accounting i. Change in basis for determining cash flows The amendments will require an entity to account for a change in the basis for determining the contractual cash flows of a financial asset or financial liability that is required by interest rate benchmark reform by updating the effective interest rate of the financial asset or financial liability ii. Hedge accounting The amendments provide exceptions to the hedge accounting requirements in the following areas. • Allow amendment of the designation of a hedging relationship to reflect changes that are required by the reform. • When a hedged item in a cash flow hedge is amended to reflect the changes that are required by the reform, the amount accumulated in the cash flow hedge reserve will be deemed to be based on the alternative benchmark rate on which the hedged future cash flows are determined. • When a group of items is designated as a hedged item and an item in the group is amended to reflect the changes that are required by the reform, the hedged items are allocated to sub- groups based on the benchmark rates being hedged. • If an entity reasonably expects that an alternative benchmark rate will be separately identifiable within a period of 24 months, it is not prohibited from designating the rate as a non-contractually specified risk component if it is not separately identifiable at the designation date. iii. Disclosure The amendments will require PEMEX to disclose additional information about its exposure to risks arising from interest rate benchmark reform and related risk management activities. iv. Transition As of December 31, 2020, PEMEX is evaluating the possible impacts on the application of these new standards. B. Other standards. The following amended standards and interpretations are not expected to have a significant impact on the PEMEX’s consolidated financial statements. • Onerous contracts – Cost of Fulfilling a Contract (Amendments to IAS 37) • Covid-19-Related • Property, Plant and Equipment: Proceeds before Intended Use (Amendments to IAS 16). • Reference to Conceptual Framework (Amendments to IFRS 3). • Classification of Liabilities as Current or Non-current • Insurance Contracts (Amendments to IFRS 17).

Subsidiary Guarantor Informatio

Subsidiary Guarantor Information	12 Months Ended
	Dec. 31, 2020
Text block [abstract]
Subsidiary Guarantor Information	NOTE 30. SUBSIDIARY GUARANTOR INFORMATION The following consolidating information presents: (i) condensed consolidated statements of financial position at December 31, 2020 and 2019 and condensed consolidated statements of comprehensive income and cash flows for the years ended December 31, 2020, 2019 and 2018 of Petróleos Mexicanos, the Subsidiary Guarantors and the Non-Guarantor These condensed consolidated statements were prepared in conformity with IFRS, with one exception: for the purposes of the presentation of the subsidiary guarantor information, the Subsidiary Entities and Subsidiary Companies have been accounted for as investments under the equity method by Petróleos Mexicanos. Earnings of subsidiaries are therefore reflected in Petróleos Mexicanos’ investment account and earnings. The principal elimination entries eliminate Petróleos Mexicanos’ investment in subsidiaries and inter-company 100%-owned non-guarantor “Non-Guarantor The Pemex Project Funding Master Trust (the “Master Trust”), which was a trust formed for the purpose of financing PEMEX’s projects, was dissolved effective December 20, 2011 and is no longer consolidated in the financial statements of PEMEX as of December 31, 2011 and thereafter. The following table sets forth, as of December 31, 2020, the principal amount outstanding of the registered debt securities originally issued by the Master Trust. As noted above, Petróleos Mexicanos has assumed, as primary obligor, all of the obligations of the Master Trust under these debt securities. The obligations of Petróleos Mexicanos are guaranteed by the Subsidiary Guarantors: Table 1: Registered Debt Securities originally issued by the Master Trust and Assumed by Petróleos Mexicanos Security Primary Guarantors Principal amount outstanding (U.S. $) 6.625% Guaranteed Bonds due 2035 Petróleos Mexicanos Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics 2,749,000 6.625% Guaranteed Bonds due 2038 Petróleos Mexicanos Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics 491,175 8.625% Bonds due 2022 Petróleos Mexicanos Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics 89,609 8.625% Guaranteed Bonds due 2023 Petróleos Mexicanos Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics 63,705 9.50% Guaranteed Bonds due 2027 Petróleos Mexicanos Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics 219,217 The following table sets forth, as of December 31, 2020, the principal amount outstanding of the registered debt securities issued by Petróleos Mexicanos, and guaranteed by Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics. Table 2: Registered Debt Securities originally issued by Petróleos Mexicanos Security Issuer Guarantors Principal amount Floating Rate Notes due 2022 Petróleos Mexicanos Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics 500,448 9.50% Global Guaranteed Bonds Petróleos Mexicanos Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics 102,149 5.50% Notes due 2021 Petróleos Mexicanos Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics 806,540 3.500% Notes due 2023 Petróleos Mexicanos Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics 1,143,938 4.875% Notes due 2024 Petróleos Mexicanos Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics 1,031,954 6.625% Notes due 2035 Petróleos Mexicanos Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics 2,749,000 6.500% Bonds due 2041 Petróleos Mexicanos Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics 1,560,521 4.875% Notes due 2022 Petróleos Mexicanos Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics 639,371 5.375% Notes due 2022 Petróleos Mexicanos Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics 447,340 5.50% Bonds due 2044 Petróleos Mexicanos Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics 793,638 6.375% Bonds due en 2045 Petróleos Mexicanos Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics 1,560,461 5.625% Bonds due 2046 Petróleos Mexicanos Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics 947,279 4.500% Notes due 2026 Petróleos Mexicanos Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics 1,386,032 4.250% Notes due 2025 Petróleos Mexicanos Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics 790,153 6.375% Notes due 2021 Petróleos Mexicanos Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics 192,826 6.875% Notes due 2026 Petróleos Mexicanos Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics 2,970,334 4.625% Notes due 2023 Petróleos Mexicanos Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics 895,444 6.750% Bonds due 2047 Petróleos Mexicanos Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics 5,997,558 5.350% Notes due 2028 Petróleos Mexicanos Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics 2,482,468 6.350% Bonds due 2048 Petróleos Mexicanos Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics 2,882,540 6.500% Notes due 2027 Petróleos Mexicanos Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics 5,478,577 5.950% Notes due 2031 Petróleos Mexicanos Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics 3,777,381 6.490% Notes due 2027 Petróleos Mexicanos Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics 2,341,377 6.840% Notes due 2030 Petróleos Mexicanos Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics 4,387,135 6.950% Bonds due 2060 Petróleos Mexicanos Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics 3,796,812 7.690% Bonds due 2050 Petróleos Mexicanos Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics 8,047,831 6.500% Notes due 2029 Petróleos Mexicanos Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics 1,986,963 Petróleos Mexicanos is the only PEMEX entity that had debt securities registered with the SEC outstanding as of December 31, 2020 and as of the date of these consolidated financial statements, and all guaranteed debt is issued by Petróleos Mexicanos. The guaranties of the Subsidiary Guarantors are full and unconditional and joint and several. PEMEX’s management has not presented separate financial statements for the Subsidiary Guarantors, because it has determined that such information is not material to investors. SUPPLEMENTAL CONDENSED CONSOLIDATING FINANCIAL INFORMATION STATEMENT OF FINANCIAL POSITION As of December 31, 2020 Petróleos Mexicanos Subsidiary guarantors Non-guarantor subsidiaries Eliminations PEMEX Assets Current assets Cash and cash equivalents Ps. 9,394,220 Ps. 4,970,074 Ps. 25,625,487 Ps. — Ps. 39,989,781 Trade and other accounts receivable, derivative financial instruments and other current assets 46,962,377 139,800,991 50,500,929 — 237,264,297 Accounts receivable—inter-company 800,429,251 1,061,537,492 131,931,674 (1,993,898,417 ) — Inventories 889,543 41,946,007 9,770,111 — 52,605,661 Total current assets 857,675,391 1,248,254,564 217,828,201 (1,993,898,417 ) 329,859,739 Long-term receivables—intercompany 1,824,398,719 — 988,069 (1,825,386,788 ) — Investments in joint ventures and associates (1,358,455,811 ) 45,295,025 75,662,389 1,249,513,526 12,015,129 Wells, pipelines, properties, plant and equipment-net 8,548,022 1,209,708,979 57,872,520 — 1,276,129,521 Long-term notes receivables 1,999 884,828 — — 886,827 Right of use 759,133 56,949,499 1,486,625 — 59,195,257 Deferred taxes 59,277,027 45,431,025 3,821,147 — 108,529,199 Intangible assets 25,650 21,639,537 1,110,597 — 22,775,784 Mexican Government Bonds 111,512,962 — — — 111,512,962 Other assets — 780,426 6,803,084 — 7,583,510 Total assets 1,503,743,092 2,628,943,883 365,572,632 (2,569,771,679 ) 1,928,487,928 Liabilities Current liabilities Current portion of long-term debt 334,770,935 6,642,039 49,684,293 — 391,097,267 Accounts payable—inter-company 1,360,720,755 552,292,445 78,413,852 (1,991,427,052 ) — Other current liabilities 18,629,284 325,647,266 37,036,254 — 381,312,804 Total current liabilities 1,714,120,974 884,581,750 165,134,399 (1,991,427,052 ) 772,410,071 Long-term debt 1,825,964,253 27,513,661 14,152,136 — 1,867,630,050 Long-term payables—inter-company — 1,825,630,931 2,227,221 (1,827,858,152 ) — Employee benefits, provisions for sundry creditors, other liabilities and deferred taxes 368,754,587 1,315,022,188 9,398,062 — 1,693,174,837 Total liabilities 3,908,839,814 4,052,748,530 190,911,818 (3,819,285,204 ) 4,333,214,958 Equity (deficit), net (2,405,096,722 ) (1,423,804,647 ) 174,660,814 1,249,513,525 (2,404,727,030 ) Total liabilities and equity Ps.1,503,743,092 Ps.2,628,943,883 Ps.365,572,632 Ps.(2,569,771,679 ) Ps.1,928,487,928 SUPPLEMENTAL CONDENSED CONSOLIDATING FINANCIAL INFORMATION STATEMENT OF FINANCIAL POSITION As of December 31, 2019 Petróleos Mexicanos Subsidiary guarantors Non-guarantor subsidiaries Eliminations PEMEX Assets Current assets Cash and cash equivalents Ps. 28,234,857 Ps. 4,826,057 Ps. 27,560,717 Ps. — Ps. 60,621,631 Trade and other accounts receivable, derivative financial instruments and other current assets 21,286,590 121,770,414 56,684,210 — 199,741,214 Accounts receivable—inter-company 592,503,940 1,134,820,799 129,911,984 (1,857,236,723 ) — Inventories 459,131 51,833,240 30,379,825 — 82,672,196 Total current assets 642,484,518 1,313,250,510 244,536,736 (1,857,236,723 ) 343,035,041 Long-term receivables—intercompany 1,692,840,909 — 1,615,441 (1,694,456,350 ) — Investments in joint ventures and associates (980,054,315 ) 10,757,092 73,151,606 911,020,196 14,874,579 Wells, pipelines, properties, plant and equipment-net 9,706,301 1,234,911,644 32,930,617 — 1,277,548,562 Long-term notes receivables 121,626,851 938,455 — — 122,565,306 Right of use 1,385,617 67,564,544 1,868,153 — 70,818,314 Deferred taxes 81,127,820 50,735,224 4,303,703 — 136,166,747 Intangible assets 130,535 13,018,022 1,435,967 — 14,584,524 Other assets — 564,971 4,089,036 — 4,654,007 Total assets 1,569,248,236 2,691,740,462 363,931,259 (2,640,672,877 ) 1,984,247,080 Liabilities Current liabilities Current portion of long-term debt 209,291,307 2,942,757 32,690,121 — 244,924,185 Accounts payable—inter-company 1,275,967,793 471,706,488 106,934,283 (1,854,608,564 ) — Other current liabilities 23,694,401 230,345,159 53,239,883 — 307,279,443 Total current liabilities 1,508,953,501 704,994,404 192,864,287 (1,854,608,564 ) 552,203,628 Long-term debt 1,694,319,842 28,300,551 15,629,510 — 1,738,249,903 Long-term payables—inter-company — 1,694,801,416 2,283,093 (1,697,084,509 ) — Employee benefits, provisions for sundry creditors, other liabilities and deferred taxes 363,041,463 1,247,581,410 14,579,978 — 1,625,202,851 Total liabilities 3,566,314,806 3,675,677,781 225,356,868 (3,551,693,073 ) 3,915,656,382 Equity (deficit), net (1,997,066,570 ) (983,937,319 ) 138,574,391 911,020,196 (1,931,409,302 ) Total liabilities and equity Ps. 1,569,248,236 Ps. 2,691,740,462 Ps. 363,931,259 Ps. (2,640,672,877) Ps. 1,984,247,080 SUPPLEMENTAL CONDENSED CONSOLIDATING FINANCIAL INFORMATION STATEMENT OF COMPREHENSIVE INCOME For the year ended December 31, 2020 Petróleos Mexicanos Subsidiary Non-guarantor Eliminations PEMEX consolidated Net sales — 1,115,845,485 459,202,040 (626,101,165 ) 948,946,360 Services income 78,461,654 88,034,087 12,253,482 (174,033,739 ) 4,715,484 Total sales revenues 78,461,654 1,203,879,572 471,455,522 (800,134,904 ) 953,661,844 (Impairment) of wells, pipelines, properties, plant and equipment — (36,303,470 ) (50,230 ) — (36,353,700 ) Cost of sales 982,896 1,090,745,812 460,296,695 (719,410,713 ) 832,614,690 Gross income 77,478,758 76,830,290 11,108,597 (80,724,191 ) 84,693,454 Other revenues (expenses), net 170,887 5,733,633 4,635,082 34,530 10,574,132 Total general expenses 75,817,961 154,020,378 9,198,761 (80,706,414 ) 158,330,686 Operating income 1,831,684 (71,456,455 ) 6,544,918 16,753 (63,063,100 ) Financing cost, net (54,710,062 ) (70,134,087 ) (3,066,150 ) (16,754 ) (127,927,053 ) Foreign exchange income, net (1,778,917 ) (125,864,355 ) (1,306,032 ) — (128,949,304 ) Profit (loss) sharing in joint ventures and associates (433,417,288 ) 1,288,687 (12,588,491 ) 441,176,559 (3,540,533 ) (Loss) income before taxes, duties and other (488,074,583 ) (266,166,210 ) (10,415,755 ) 441,176,558 (323,479,990 ) Total taxes, duties and other 20,804,230 159,451,307 5,316,538 — 185,572,075 Net (loss) income for the year (508,878,813 ) (425,617,517 ) (15,732,293 ) 441,176,558 (509,052,065 ) Total other comprehensive result (6,062,096 ) (12,844,301 ) 7,600,985 — (11,305,412 ) Total comprehensive result for the year (514,940,909 ) (438,461,818 ) (8,131,308 ) 441,176,558 (520,357,477 ) SUPPLEMENTAL CONDENSED CONSOLIDATING FINANCIAL INFORMATION STATEMENT OF COMPREHENSIVE INCOME For the year ended December 31, 2019 Petróleos Mexicanos Subsidiary guarantors Non-guarantor subsidiaries Eliminations PEMEX consolidated Net sales Ps. — Ps. 1,623,118,346 Ps. 712,266,064 Ps. (942,521,905 ) Ps. 1,392,862,505 Services income 59,915,165 131,935,732 9,683,190 (192,425,407 ) 9,108,680 Total sales revenues 59,915,165 1,755,054,078 721,949,254 (1,134,947,312 ) 1,401,971,185 (Impairment) of wells, pipelines, properties, plant and equipment — (27,672,704 ) (3,610,450 ) — (31,283,154 ) Cost of sales 989,308 1,488,250,706 705,101,991 (1,071,408,581 ) 1,122,933,424 Gross income 58,925,857 239,130,668 13,236,813 (63,538,731 ) 247,754,607 Other revenues (expenses), net 139,412 3,048,907 4,616,272 (75,835 ) 7,728,756 Total general expenses 62,645,185 141,628,000 11,974,223 (63,592,675 ) 152,654,733 Operating income (3,579,916 ) 100,551,575 5,878,862 (21,891 ) 102,828,630 Financing cost, net (66,593,657 ) (57,364,522 ) (2,953,372 ) 21,891 (126,889,660 ) Foreign exchange income, net 3,912,176 82,143,830 874,382 — 86,930,388 Profit (loss) sharing in joint ventures and associates (292,585,923 ) 116,536 (4,297,609 ) 295,609,103 (1,157,893 ) (loss) income before taxes, duties and other (358,847,320 ) 125,447,419 (497,737 ) 295,609,103 61,711,465 Total taxes, duties and other (11,557,958 ) 352,239,318 3,142,129 — 343,823,489 Net (loss) income for the year (347,289,362 ) (226,791,899 ) (3,639,866 ) 295,609,103 (282,112,024 ) Total other comprehensive result (55,495,859 ) (253,482,329 ) (375,252 ) (2,669,406 ) (312,022,846 ) Total comprehensive result for the year Ps. (402,785,221 ) Ps. (480,274,228 ) Ps. (4,015,118 ) Ps. 292,939,697 Ps. (594,134,870 ) SUPPLEMENTAL CONDENSED CONSOLIDATING FINANCIAL INFORMATION STATEMENT OF COMPREHENSIVE INCOME For the year ended December 31, 2018 Petróleos Mexicanos Subsidiary guarantors Non-guarantor subsidiaries Eliminations PEMEX consolidated Net sales Ps. — Ps. 1,941,467,663 Ps. 912,726,857 Ps. (1,181,748,372 ) Ps. 1,672,446,148 Services income 75,979,835 113,113,024 5,960,807 (186,380,664 ) 8,673,002 Total sales revenues 75,979,835 2,054,580,687 918,687,664 (1,368,129,036 ) 1,681,119,150 Reversal (impairment) of wells, pipelines, properties, plant and equipment — 25,384,888 (3,965,891 ) — 21,418,997 Cost of sales 1,905,865 1,536,120,030 910,525,715 (1,249,040,049 ) 1,199,511,561 Gross income 74,073,970 543,845,545 4,196,058 (119,088,987 ) 503,026,586 Other revenues (expenses), net 73,183 (26,020,067 ) 8,710,216 40,289,179 23,052,511 Total general expenses 69,479,218 158,965,537 10,248,039 (80,014,104 ) 158,678,690 Operating income 4,667,935 358,859,941 2,658,235 1,214,296 367,400,407 Financing cost, net (64,226,376 ) (46,203,154 ) (475,599 ) (523,384 ) (111,428,513 ) Foreign exchange income, net (3,832,933 ) 26,526,563 965,850 — 23,659,480 Profit (loss) sharing in joint ventures and associates (125,246,527 ) 53,058 2,164,868 124,555,613 1,527,012 Income (loss) before taxes, duties and other (188,637,901 ) 339,236,408 5,313,354 125,246,525 281,158,386 Total taxes, duties and other (8,272,851 ) 466,788,123 3,062,951 — 461,578,223 Net (loss) income for the year (180,365,050 ) (127,551,715 ) 2,250,403 125,246,525 (180,419,837 ) Total other comprehensive result 47,357,316 176,174,564 (140,133 ) — 223,391,747 Total comprehensive result for the year Ps. (133,007,734 ) Ps. 48,622,849 Ps. 2,110,270 Ps. 125,246,525 Ps. 42,971,910 SUPPLEMENTAL CONDENSED CONSOLIDATING FINANCIAL INFORMATION STATEMENT OF CASH FLOWS For the year ended December 31, 2020 Petróleos Subsidiary Non-guarantor Eliminations PEMEX Operating activities: Net (loss) income for the year (508,878,813 ) (425,617,517 ) (15,507,766 ) 440,952,031 (509,052,065 ) Income tax and duties 20,804,230 159,451,307 5,316,538 — 185,572,075 Depreciation and amortization 1,066,176 126,778,686 1,786,958 — 129,631,820 Amortization of intangible assets 453,081 (30,155 ) 56,062 — 478,988 Impairment of wells, pipelines, properties, plant and equipment — 36,303,471 50,229 — 36,353,700 Capitalized unsuccesful wells — 10,947,702 — — 10,947,702 Unsuccesful wells from intangible assets — 8,404,284 — — 8,404,284 Disposal of wells, pipelines, properties, 94,065 3,004,053 2,199,444 — 5,297,562 Disposal of intangible asset 396,118 396,118 Amortization of rights of use 644,838 5,453,688 1,130,705 — 7,229,231 Cancellation of rights of use — (1,101,987 ) — — (1,101,987 ) Gain on sale of subsidiary entity — — (707,533 ) — (707,533 ) Effects of net present value of reserve for well abandonment — 4,555,692 — — 4,555,692 Profit (loss) sharing in investments 441,125,283 (41,685 ) 3,582,218 (441,125,283 ) 3,540,533 Unrealized foreign exchange loss (gain) 117,158,102 12,040,638 3,267,503 — 132,466,243 Interest expense 134,335,289 25,908,927 1,521,026 — 161,765,242 Interest income (11,617,299 ) (5,124,749 ) — — (16,742,048 ) Funds (used in) from operating activities: Taxes 1,349,021 (155,315,035 ) (3,725,449 ) — (157,691,463 ) Accounts receivable, accounts payable, derivative financial instruments and accrued liabilities (16,644,218 ) (692,255 ) 22,115,695 — 4,779,222 Employee benefits (355,666 ) 64,873,037 (5,347,025 ) — 59,170,346 Inter-company charges and deductions (147,308,477 ) 37,878,271 35,319,045 74,111,161 — Cash flows (used in) from operating activities 32,225,612 (92,323,627 ) 51,453,768 73,937,909 65,293,662 Investing activities: Acquisition of wells, pipelines, properties, plant (349,555 ) (97,841,648 ) (40,426,953 ) — (138,618,156 ) Other assets and other receivables 930,596 (812,028 ) (2,640,055 ) — (2,521,487 ) (Increase) decrease due to Inter-company investing (194,281,597 ) — 627,372 193,654,225 — Cash flows used in investing activities (193,700,556 ) (98,653,676 ) (42,439,636 ) 193,654,225 (141,139,643 ) Financing activities: Increase in equity due to Certificates of Contribution “A” 46,256,000 — — — 46,256,000 Long-terms and interest received from the Mexican Government 5,800,940 — — — 5,800,940 Lease payments of principal and interest (396,917 ) (8,266,969 ) (1,346,915 ) — (10,010,801 ) Loans obtained from financial institutions 730,222,863 1,046 557,905,959 — 1,288,129,868 Debt payments, principal only (601,448,338 ) (4,828,154 ) (545,685,655 ) — (1,151,962,147 ) Interest paid (122,553,204 ) (7,200,077 ) (1,235,869 ) — (130,989,150 ) Inter-company increase (decrease) financing 84,752,963 211,415,474 (28,576,303 ) (267,592,134 ) — Cash flows provided by financing activities: 142,634,307 191,121,320 (18,938,783 ) (267,592,134 ) 47,224,710 Net (decrease) increase in cash and cash equivalents (18,840,637 ) 144,017 (9,924,651 ) — (28,621,271 ) Effects of change in cash value — — 7,989,421 — 7,989,421 Cash and cash equivalents at the beginning of the year 28,234,857 4,826,057 27,560,717 — 60,621,631 Cash and cash equivalents at the end of the year 9,394,220 4,970,074 25,625,487 — 39,989,781 SUPPLEMENTAL CONDENSED CONSOLIDATING FINANCIAL INFORMATION STATEMENT OF CASH FLOWS For the year ended December 31, 2019 Petróleos Subsidiary Non-guarantor Eliminations PEMEX Operating activities: Net (loss) income for the year Ps. (347,289,363 ) Ps. (225,457,279 ) Ps. (4,974,486 ) Ps. 295,609,104 Ps. (282,112,024 ) Income tax and duties (11,557,958 ) 352,291,238 3,090,209 — 343,823,489 Depreciation and amortization 1,183,741 134,134,135 1,869,134 — 137,187,010 Amortization of intangible assets 373,961 86,342 83,069 — 543,372 Impairment of wells, pipelines, properties, plant and equipment — 27,672,705 3,610,449 — 31,283,154 Capitalized unsuccesful wells — 71,604,308 — — 71,604,308 Unsuccesful wells from intangible assets — 7,990,877 — — 7,990,877 Disposal of wells, pipelines, properties, plant and equipment 14,115 1,492,916 1,034,527 — 2,541,558 Amortization of rights of use 639,877 5,439,642 1,349,756 — 7,429,275 Effects of net present value of reserve for well abandonment — (258,816 ) — — (258,816 ) Profit (loss) sharing in investments 296,230,824 (538,281 ) (1,473,955 ) (293,060,695 ) 1,157,893 Unrealized foreign exchange loss (gain) (74,439,514 ) (2,867,091 ) (938,369 ) — (78,244,974 ) Interest expense 118,543,971 12,446,222 1,871,147 — 132,861,340 Interest income (22,964,784 ) (5,410,645 ) (860,174 ) — (29,235,603 ) Funds (used in) from operating activities: Accounts receivable, accounts payable, derivative financial instruments and accrued liabilities 11,279,402 32,413,620 675,345 — 44,368,367 Taxes (10,682,007 ) (356,254,147 ) (5,737,259 ) — (372,673,413 ) Employee benefits 52,052,212 9,322,327 5,580,162 — 66,954,701 Inter-company charges and deductions (439,039,267 ) 176,676,691 5,349,241 257,013,335 — Cash flows (used in) from operating activities (425,654,790 ) 240,784,764 10,528,796 259,561,744 85,220,514 Investing activities: Acquisition of wells, pipelines, properties, plant and equipment and intangible assets (232,592 ) (132,206,201 ) 5,564,862 — (126,873,931 ) Other assets and other receivables 14,743,694 933,269 (101,835 ) — 15,575,128 (Increase) decrease due to Inter-company investing 401,422,502 — — (401,422,502 ) — Cash flows used in investing activities 415,933,604 (131,272,932 ) 5,463,027 (401,422,502 ) (111,298,803 ) Financing activities: Increase in equity due to Certificates of Contribution “A” 122,131,000 41,956,917 (41,956,917 ) — 122,131,000 Long-terms and interest received from the Mexican Government 38,704,883 — — — 38,704,883 Lease payments (588,463 ) (8,745,025 ) (1,375,933 ) — (10,709,421 ) Loans obtained from financial institutions 824,049,426 46,297 343,739,223 — 1,167,834,946 Debt payments, principal only (851,077,341 ) (4,826,936 ) (329,138,006 ) — (1,185,042,283 ) Interest paid (120,450,950 ) (6,104,160 ) (1,390,093 ) — (127,945,203 ) Inter-company increase (decrease) financing — (143,484,166 ) 1,623,408 141,860,758 — Cash flows provided by financing activities: 12,768,555 (121,157,073 ) (28,498,318 ) 141,860,758 4,973,922 Net (decrease) increase in cash and cash equivalents 3,047,369 (11,645,241 ) (12,506,495 ) — (21,104,367 ) Effects of change in cash value — — (186,411 ) — (186,411 ) Cash and cash equivalents at the beginning of the year 25,187,488 16,471,298 40,253,623 — 81,912,409 Cash and cash equivalents at the end of the year Ps. 28,234,857 Ps. 4,826,057 Ps. 27,560,717 Ps. — Ps. 60,621,631 SUPPLEMENTAL CONDENSED CONSOLIDATING FINANCIAL INFORMATION STATEMENT OF CASH FLOWS For the year ended December 31, 2018 Petróleos Subsidiary Non-guarantor Eliminations PEMEX consolidated Operating activities: Net (loss) income for the year Ps. (180,365,050 ) Ps. (127,551,718 ) Ps. 2,305,189 Ps. 125,191,742 Ps. (180,419,837 ) Adjustments to reconcile net loss to cash provided by operating activities: Depreciation and amortization 1,274,179 149,747,232 2,360,629 — 153,382,040 Amortization of intangible assets 2,446,445 86,332 110,549 — 2,643,326 Impairment of wells, pipelines, properties, plant and equipment — (25,384,888 ) 3,965,891 — (21,418,997 ) Capitalized unsuccesful wells — 15,443,086 — — 15,443,086 Unsuccesful wells from intangible assets — (2,171,218 ) — — (2,171,218 ) Disposal of wells, pipelines, properties, plant and equipment 872,527 12,226,128 3,786,609 — 16,885,264 Gain on sale of share in joint ventures and associates — (10,257 ) (690,914 ) — (701,171 ) Effects of net present value of reserve for well abandonment — (6,953,200 ) — — (6,953,200 ) Profit (loss) sharing in investments 125,246,527 (538,281 ) (1,473,955 ) (124,761,303 ) (1,527,012 ) Unrealized foreign exchange loss (gain) (19,726,271 ) 446,523 (482,460 ) — (19,762,208 ) Interest expense 109,697,028 12,720,032 1,452,624 — 123,869,684 Interest income (9,520,962 ) — — — (9,520,962 ) Funds (used in) from operating activities: Accounts receivable, accounts payable, derivative financial instruments and accrued liabilities 51,460,407 (73,421,161 ) 26,118,293 — 4,157,539 Taxes (8,881,300 ) 38,071,896 (157,861 ) — 29,032,735 Other assets and other liabilities 559,449 (12,071,857 ) (3,244,955 ) — (14,757,363 ) Employee benefits 10,519,603 44,858,697 (1,773,416 ) — 53,604,884 Inter-company charges and deductions (14,527,177 ) 81,240,429 (21,516,287 ) (45,196,965 ) — Cash flows (used in) from operating activities 69,055,405 106,737,775 10,759,936 (44,766,526 ) 141,786,590 Investing activities: Acquisition of wells, pipelines, properties, plant and equipment and intangible assets (1,162,685 ) (103,408,759 ) (4,389,245 ) — (108,960,689 ) Proceeds from sale of assets — 14,568 4,063,776 — 4,078,344 Other assets 3,586,010 212,421 — — 3,798,431 (Increase) decrease due to Inter-company investing (47,454,385 ) — — 47,454,385 — Cash flows used in investing activities (45,031,060 ) (103,181,770 ) (325,469 ) 47,454,385 (101,083,914 ) Financing activities: Loans obtained from financial institutions 510,871,366 — 388,897,646 — 899,769,012 Debt payments, principal only (450,353,531 ) (6,662,318 ) (384,017,543 ) — (841,033,392 ) Interest paid (106,313,795 ) (7,857,926 ) (1,117,668 ) — (115,289,389 ) Inter-company increase (decrease) financing — 8,620,192 (5,932,333 ) (2,687,859 ) — Cash flows provided by financing activities: (45,795,960 ) (5,900,052 ) (2,169,898 ) (2,687,859 ) (56,553,769 ) Net (decrease) increase in cash and cash equivalents (21,771,615 ) (2,344,047 ) 8,264,569 — (15,851,093 ) Effects of change in cash value — — (88,252 ) — (88,252 ) Cash and cash equivalents at the beginning of the year 46,959,103 18,815,345 32,077,306 — 97,851,754 Cash and cash equivalents at the end of the year Ps. 25,187,488 Ps. 16,471,298 Ps. 40,253,623 Ps. — Ps. 81,912,409

Supplementary Information on Oi

Supplementary Information on Oil and Gas Exploration And Production Activities (Unaudited)	12 Months Ended
	Dec. 31, 2020
Text block [abstract]
Supplementary Information on Oil and Gas Exploration And Production Activities (Unaudited)	NOTE 3 1 SUPPLEMENTARY INFORMATION ON OIL AND GAS EXPLORATION AND PRODUCTION ACTIVITIES (UNAUDITED) Under the Mexican Constitution, all crude oil and other hydrocarbon reserves located in the subsoil of Mexico are owned by the Mexican nation and not by PEMEX. In August 2014, through the Round Zero process, the Mexican Government granted PEMEX the right to extract, but not own, certain petroleum and other hydrocarbon reserves in Mexico through assignment deeds. This note provides supplementary information on the oil and gas exploration, development and production activities of Pemex Exploration and Production in compliance with the U.S. Financial Accounting Standards Board (FASB) Accounting Standards Codification (ASC) Topic 932 10-5 2010-03 3-G). As of the date of these consolidated financial statements, all exploration and production activities of Pemex Exploration and Production are conducted in Mexico. The supplemental data presented herein reflect information for all of Pemex Exploration and Production’s oil and gas producing activities. A. Capitalized costs for oil and gas producing activities (unaudited): 2020 2019 2018 Proved Properties Ps. 2,483,134,177 2,306,255,209 2,505,307,260 Construction in progress 64,911,619 50,951,279 51,033,968 Accumulated depreciation and amortization (1,775,163,736 ) (1,675,843,298 ) (1,572,649,381 ) Net capitalized costs Ps. 772,882,060 681,363,190 983,691,847 B. Costs incurred for oil and gas property exploration and development activities (unaudited): 2020 2019 Exploration Ps. 33,986,110 31,222,023 Development 97,041,516 82,135,240 Total costs incurred Ps. 131,027,626 113,357,263 PEMEX does not have property acquisition costs because the oil reserves it exploits are owned by the Mexican nation. Exploration costs include costs of geological and geophysical studies of fields in the amount of Ps. 9,599,274 and Ps. 10,663,334, for 2020 and 2019, respectively. These costs are accounted for as geological and geophysical exploration expenses, in accordance with the successful efforts method of accounting. Development costs include those costs incurred in obtaining access to proved reserves and providing facilities for extracting, treating, gathering and storing oil and gas. C. Results of operations for oil and gas producing activities (unaudited): 2020 2019 2018 Revenues from sale of oil and gas Ps. 558,051,547 762,102,939 910,433,244 Hydrocarbon duties 154,609,136 343,242,436 443,491,451 Production costs (excluding taxes) 257,571,641 275,090,795 273,695,691 Other costs and expenses (7,024,695 ) (6,910,321 ) (10,109,114 ) Exploration expenses 31,868,857 90,258,519 30,953,413 Depreciation, depletion, amortization and accretion 845,380 222,651,461 28,845,604 437,870,319 924,332,890 766,877,047 Results of operations for oil and gas producing activities Ps. 120,181,228 (162,229,951 ) 143,556,198 D. Sales prices (unaudited) The following table summarizes average sales prices in U.S. dollars for each of the years ended December 31 (excluding production taxes): Description 2020 2019 2018 Weighted average sales price per barrel of oil equivalent (boe) (1) U.S. $ 27.86 U.S. $ 43.52 U.S. $ 50.89 Crude oil, per barrel 35.47 57.13 62.99 Natural gas, per thousand cubic feet 2.54 3.55 5.57 (1) To convert dry gas to barrels of oil equivalent, a factor of 5.201 thousand cubic feet of dry gas per barrel of oil equivalent is used. E. Crude oil and natural gas reserves (unaudited) Under the Mexican Constitution, all oil and other hydrocarbon reserves located in the subsoil of Mexico are owned by the Mexican nation and not by PEMEX. Under the Petróleos Mexicanos Law, Pemex Exploration and Production has the right to extract, but not own, these reserves, and to sell the resulting production. The exploration and development activities of Petróleos Mexicanos and the Subsidiary Entities are limited to reserves located in Mexico. Proved oil and natural gas reserves are those estimated quantities of crude oil, natural gas and natural gas liquids which geological and engineering data demonstrate with reasonable certainty to be economically producible from a given date forward, from known reservoirs and under existing economic conditions, operating methods and government regulations. Proved reserves estimates as of December 31, 2020 were prepared by the exploration and production segment and were reviewed by the Independent Engineering Firms (as defined below), which audit its estimates of its hydrocarbon reserves. According to the Lineamientos que Regulan los Procedimientos de Cuantificación y Certificación de Reservas de la Nación Pemex Exploration and Production estimates proved reserves based on generally accepted petroleum engineering and evaluation methods and procedures, which are based primarily on applicable SEC regulations and, as necessary, the SPE’s publication entitled Standards Pertaining to the Estimating and Auditing of Oil and Gas Reserves Information, dated June 25, 2019, and other SPE publications, including the SPE’s publication entitled Petroleum Resources Management System, as well as other technical sources, including Estimation and Classification of Reserves of Crude Oil, Natural Gas, and Condensate, by Chapman Cronquist, and Determination of Oil and Gas Reserves, Petroleum Society Monograph Number 1, published by the Canadian Institute of Mining and Metallurgy & Petroleum. The choice of method or combination of methods employed in the analysis of each reservoir is determined by: • Experience in the area • Stage of development • Quality and completeness of basic data • Production and pressure histories Reserves data set forth herein represents only estimates. Reserves valuation is a subjective process of estimating underground accumulations of crude oil and natural gas that cannot be measured in an exact manner. The accuracy of any reserves estimate depends on the quality of available data, engineering and geological interpretation and professional judgment. As a result, estimates of different engineers may vary. In addition, the results of drilling, testing and producing subsequent to the date of an estimate may lead to the revision of an estimate. During 2020, PEMEX did not record any material increase in PEMEX’s hydrocarbons reserves as a result of the use of new technologies. In order to ensure the reliability of PEMEX’s reserves estimation efforts, it has undertaken the internal certification of its estimates of reserves since 1996. PEMEX has established certain internal controls in connection with the preparation of its proved reserves estimates. Initially, teams of geoscientists from Pemex Exploration and Production’s exploration and exploitation business units (with each of these units covering several projects) prepare the reserves estimates, using distinct estimation processes for valuations relating to new discoveries and developed fields, respectively. Subsequently, the regional reserves offices collect these reserves estimates from the units and request that the Gerencia de Certificación de Reservas de Hidrocarburos, (Office of Resources and Reserves Certification), the central hydrocarbon reserves management body of Pemex Exploration and Production, review and certify such valuations and the booking of the related reserves. This internal certification process is undertaken in accordance with internal guidelines for estimating and classifying hydrocarbon reserves, which are based on the SEC’s rules and definitions. The Office of Resources and Reserves Certification, which additionally oversees and conducts an internal audit of the above process, consists entirely of professionals with geological, geophysical, petrophysical and reservoir engineering backgrounds. The engineers who participate in PEMEX’s reserves estimation process are experienced in the following areas: reservoir numerical simulation; well drilling and completion; pressure, volume and temperature (PVT) analysis; analytical tools used in forecasting the performance of the various elements comprising the production system; and design strategies in petroleum field development. Furthermore, all of PEMEX’s personnel have been certified by the Secretaría de Educación Pública In addition to this internal review process, Pemex Exploration and Production’s final reserves estimates are audited by independent engineering firms. Four independent engineering firms audited Pemex Exploration and Production’s estimates of proved reserves as of December 31, 2020 or January 1, 2021: DeGolyer and MacNaughton (“DeGolyer”), Netherland, Sewell International, S. de R.L. de C.V. (“Netherland Sewell”), GLJ LTD. (“GLJ”) and Sproule International Limited (“Sproule”), the “Independent Engineering Firms”. The reserves estimate reviewed by the Independent Engineering Firms totaled 97.8% of PEMEX’s estimated proved reserves. The remaining 2.2% of PEMEX’s estimated proved reserves consisted of reserves located mainly in certain areas which have been shared with third parties. Under such agreements, the corresponding third party is responsible of assessing the volume of reserves. Netherland Sewell audited the reserves in the Cantarell, Ku-Maloob-Zaap, Abkatún-Pol-Chuc Since reserves estimates are, by definition, only estimates, they cannot be reviewed for the purpose of verifying exactness. Instead, the Independent Engineering Firms conducted a detailed review of Pemex Exploration and Production’s reserves estimates so that they could express an opinion as to whether, in the aggregate, the reserves estimates that Pemex Exploration and Production furnished were reasonable and had been estimated and presented in conformity with generally accepted petroleum engineering and evaluation methods and procedures. All questions, including any suggested modifications to proved reserves estimates, that arose during the Independent Engineering Firms’ review process were resolved by Pemex Exploration and Production to the satisfaction of the Independent Engineering Firms. The Independent Engineering Firms have concluded that PEMEX’s estimated total proved oil and natural gas reserve volumes set forth in this report are, in the aggregate, reasonable and have been prepared in accordance with Rule 4-10(a) PEMEX’s total proved developed and undeveloped reserves of crude oil, condensates and liquefiable hydrocarbons recoverable from field processing plants increased by 1.3% in 2020, from 5,960.6 million barrels at December 31, 2019 to 6,041.0 million barrels at December 31, 2020. PEMEX’s proved developed reserves of crude oil, condensates and liquefiable hydrocarbons recoverable from processing plants increased by 0.5 % in 2020, from 3,585.0 million barrels at December 31, 2019 to 3,603.4 million barrels at December 31, 2020. The amount of our proved reserves of crude oil, condensate and liquefiable hydrocarbon reserves added in 2020 was enough to offset the level of production in 2020, which amounted to 694.8 million barrels of crude oil, condensates and liquefiable hydrocarbons. PEMEX’s total proved developed and undeveloped dry gas reserves increased by 10.0% in 2020, from 6,351.7 billion cubic feet at December 31, 2019 to 6,984.2 billion cubic feet at December 31, 2020. PEMEX’s proved developed dry gas reserves increased by 8.7% in 2020, from 3,608.5 billion cubic feet at December 31, 2019 to 3,922.3 billion cubic feet at December 31, 2020. These increases were principally due to higher proved developed dry gas reserves in the fields of Poza Rica, Burgos and Abkatún-Pol-Chuc Abkatún-Pol-Chuc During 2020, PEMEX’s exploratory activity in the shallow waters of the Gulf of Mexico and onshore regions resulted in three new discoveries of oil fields (Camatl, Paki and Xolotl). In addition, PEMEX discovered three new reservoirs in the existing fields Cibix, Terra and Pokche. Further, extension activities in our Pokche, Ixachi and Quesqui fields led to the incorporation of additional reserves. Together, these extensions and discoveries led to the incorporation approximately 130.6 million barrels of oil equivalent. The following three tables of crude oil and dry gas reserves set forth PEMEX’s estimates of its proved reserves determined in accordance with Rule 4-10(a). Summary of oil and gas (1) based on average fiscal year prices Crude oil and (2) Dry Gas (3) (in millions of barrels) (in billions of cubic feet) Proved developed and un-developed Proved developed reserves 3,603.4 3,922.3 Proved undeveloped reserves 2,437.6 3,061.9 Total proved reserves 6,041.0 6,984.2 Note: Numbers may not total due to rounding. (1) PEMEX does not currently produce synthetic oil or synthetic gas, or other natural resources from which synthetic oil or synthetic gas can be produced. (2) Crude oil and condensate reserves include the fraction of liquefiable hydrocarbons recoverable in natural gas processing plants located at fields. (3) Reserve volumes reported in this table are volumes of dry gas, although natural gas production reported in other tables refers to sour wet gas. There is a shrinkage in volume when natural gas liquids and impurities are extracted to obtain dry gas. Therefore, reported natural gas volumes are greater than dry gas volumes. Source: Pemex Exploration and Production. Crude oil and condensate reserves (including natural gas liquids) (1) 2020 2019 2018 (in millions of barrels) Proved developed and undeveloped reserves: At December 31 5,961 5,786 6,427 Revisions (2) 651 784 22 Extensions and discoveries 97 78 140 Production (695 ) (687 ) (744 ) Farm-outs and transfers to E&P contracts (CEE) and transfers of fields due to CNH bidding process 27 — (59 ) At December 31 6,041 5,961 5,786 Proved developed reserves at December 31 3,603 3,585 3,588 Proved undeveloped reserves at December 31 2,438 2,376 2,198 Note: Numbers may not total due to rounding. (1) Crude oil and condensate reserves include the fraction of liquefiable hydrocarbons recoverable in natural gas processing plants located at fields. (2) Revisions include positive and negative changes due to new data from well drilling, revisions made when actual reservoir performance differs from expected performance and changes in hydrocarbon prices. Source: Pemex Exploration and Production. Dry gas reserves 2020 2019 2018 (in billions of cubic feet) Proved developed and undeveloped reserves: At December 31 6,352 6,370 6,593 Revisions (1) 1,240 656 3 Extensions and discoveries 176 196 809 Production (2) (819 ) (870 ) (887 ) Farm outs and transfer to E&P contracts (CEE) and transfers of fields due to CNH bidding process 35 — (148 ) At December 31 6,984 6,352 6,370 Proved developed reserves at December 31 3,922 3,609 3,380 Proved undeveloped reserves at December 31 3,062 2,743 2,990 Note: Numbers may not total due to rounding. (1) Revisions include positive and negative changes due to new data from well drilling, revisions made when actual reservoir performance differs from expected performance and changes in hydrocarbon prices. (2) Production refers here to dry gas, although natural gas production reported in other tables refers to sour wet gas. There is a shrinkage in volume when natural gas liquids and impurities are extracted to obtain dry gas. Therefore, reported natural gas volumes are greater than dry gas volumes. Source: Pemex Exploration and Production. Pemex Exploration and Production’s reserve-replacement ratio, or “RRR”, for a given period is calculated by dividing the sum of proved reserves additions due to discoveries, developments, delineations and revisions by that period’s total production. During 2020, we obtained an increase of 1,019.9 million barrels of oil equivalent of proved reserves as aggregated from discoveries, revisions, delimitations and development and production, which represents a RRR of 119.7%. PEMEX’s 2020 RRR is similar to its 2019 RRR, which was 120.1%. PEMEX expects to continue to obtain an RRR greater than 100%, consistent with the last two years. PEMEX’s reserves production ratio (“RRP”), which is presented in terms of years, is calculated by dividing the estimated remaining reserves at the end of the relevant year by the total production of hydrocarbons for that year. As of December 31, 2020, this ratio is 8.7 years for proved reserves which is similar to the RRP of 2019. F. Standardized measure of discounted future net cash flows related to proved oil and gas reserves (unaudited) The standardized measure tables presented below relate to proved oil and gas reserves excluding proved reserves scheduled to be produced after the year 2046. This measure is presented in accordance with ASC Topic 932. Estimated future cash inflows from production are computed by applying average prices of oil and gas on the first day of each month of 2020. Future development and production costs are those estimated future expenditures needed to develop and produce the year-end year-end Future tax expenses are computed by applying the appropriate year-end pre-tax The estimated future payment of taxes was calculated based on the latest fiscal regime applicable by decree to Pemex Exploration and Production, published in the Official Gazette of the Federation on December 9, 2019. The standardized measure provided below represents a comparative benchmark value rather than an estimate of expected future cash flows or fair market value of PEMEX’s production rights. There are numerous uncertainties inherent in estimating quantities of proved reserves and in projecting future rates of production and timing of development expenditures, including many factors beyond the control of the producer. Accordingly, reserve estimates may be materially different from the quantities of crude oil and natural gas that are ultimately recovered. Standardized measure of discounted future net cash flows as of December 31 2020 2019 2018 (in millions of U.S. dollars) Future cash inflows 201,777 330,286 321,065 Future production costs (excluding profit taxes) (109,064 ) (114,782 ) (103,498 ) Future development costs (23,631 ) (37,540 ) (22,224 ) Future cash flows before tax 69,082 177,964 195,343 Future production and excess gains taxes (73,122 ) (134,174 ) (156,691 ) Future net cash flows (4,040 ) 43,790 38,652 Effect of discounting net cash flows by 10% 3,359 (18,807 ) (12,434 ) Standardized measure of discounted future net cash flows (681 ) 24,983 26,218 Note: Table amounts may not total due to rounding. To comply with ASC Topic 932, the following table presents the aggregate standardized measure changes for each of the last three years and significant sources of variance: Changes in standardized measure of discounted future net cash flows 2020 2019 2018 (in millions of U.S. dollars) Sales of oil and gas produced, net of production costs (16,968 ) (29,530 ) (31,279 ) Net changes in prices and production costs (39,509 ) 73,278 62,902 Extensions and discoveries 1,426 1,658 4,323 Development cost incurred during the year 4,654 4,281 2,984 Changes in estimated development costs (10,019 ) 3,341 (2,146 ) Reserves revisions and timing changes 5,808 (19,615 ) 1,511 Accretion of discount of pre-tax 5,929 (9,305 ) 6,628 Net changes in production and excess gains taxes 23,015 (25,343 ) (22,818 ) Aggregate change in standardized measure of discounted future net cash flows (25,664 ) (1,235 ) 22,105 2020 2019 2018 (in millions of U.S. dollars) Standardized measure: As of January 1 24,983 26,218 4,113 As of December 31 (681 ) 24,983 26,218 Change (25,664 ) (1,235 ) 22,105 Note: Table amounts may not total due to rounding. In computing the amounts under each factor of change, the effects of variances in prices and costs are computed before the effects of changes in quantities. Consequently, changes in reserves are calculated at December 31 prices and costs. The change in computed taxes includes taxes effectively incurred during the year and the change in future tax expense.

Significant Accounting Polici_2

Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2020
Text block [abstract]
Basis of consolidation	A. Basis of consolidation The consolidated financial statements include the financial statements of Petróleos Mexicanos and those of its subsidiaries over which it has control. i. Subsidiaries Subsidiaries are entities controlled by PEMEX. PEMEX “controls” an entity when it is exposed to, or has rights to, variable returns from its involvement with the entity and has the ability to affect those returns through its power over the entity. The financial statements of subsidiaries are included in the consolidated financial statements from the date on which control commences until the date on which control ceases. For more information about the Subsidiary Companies, see Note 5. ii. Non-controlling NCI are measured initially at their proportionate share of the acquiree’s identifiable net assets at the date of acquisition. Changes in the ownership interest in a subsidiary that do not result in a loss of control are accounted for as equity transactions. iii. Loss of control When PEMEX loses control over a subsidiary, it derecognizes the assets and liabilities of the subsidiary, and any related NCI and other components of equity. Any resulting gain or loss is recognized in profit or loss. Any interest retained in the former subsidiary is measured at fair value when control is lost. iv. Interests in equity-accounted investees PEMEX’s interests in equity-accounted investees comprise interests in associates and a joint venture. Associates are those entities in which PEMEX has significant influence, but not control or joint control, over the financial and operating policies. A joint venture is an arrangement in which PEMEX has joint control, whereby PEMEX has rights to the net assets of the arrangement, rather than rights to its assets and obligations for its liabilities (joint operation). Interests in associates and the joint venture are accounted for using the equity method. They are initially recognized at cost, which includes transaction costs. Subsequent to initial recognition, the consolidated financial statements include PEMEX’s share of the profit or loss and other comprehensive income (OCI) of equity accounted investees, until the date on which significant influence or joint control ceases. When the value of the share of losses exceeds the value of PEMEX’s investment in an associate or joint venture, the carrying value of the investment, including any long-term investment, is reduced to zero and PEMEX ceases to recognize additional losses, except in cases where PEMEX is liable for obligations incurred by those associates and joint ventures. For more information about joint ventures and associates, see Note 12. v. Transactions eliminated on consolidation Intra-group balances and transactions, and any unrealized income and expenses arising from intra-group transactions, are eliminated. Unrealized gains arising from transactions with equity-accounted investees are eliminated against the investment to the extent of the PEMEX interest in the investee. Unrealized losses are eliminated in the same way as unrealized gains, but only to the extent that there is no evidence of impairment.
Foreign currency	B. Foreign currency i. Foreign currency transactions Transactions in foreign currencies are translated into the respective functional currencies of PEMEX companies at the exchange rates at the dates of the transactions. Monetary assets and liabilities denominated in foreign currencies are translated into the functional currency at the exchange rate at the reporting date. Non-monetary Non-monetary ii. Foreign operation The financial statements of foreign subsidiaries and associates are translated into the reporting currency by first identifying if the functional currency is different from the currency for recording the foreign operations, and, if so, the recording currency is translated into the functional currency and then into the reporting currency using the year-end Foreign currency differences are recognized in OCI and accumulated in the currency translation effect, except to the extent that the translation difference is allocated to NCI. When a foreign operation is disposed of in its entirety or partially such that control, significant influence or joint control is lost, the cumulative amount in the translation reserve related to that foreign operation is reclassified to the consolidated statement of comprehensive income as part of the gain or loss on disposal. If PEMEX disposes of part of its interest in a subsidiary but retains control, then the relevant proportion of the cumulative amount is reattributed to NCI. When PEMEX disposes of only part of an associate or joint venture while retaining significant influence or joint control, the relevant proportion of the cumulative amount is reclassified to profit or loss.
Financial instruments	C. Financial instruments i. Recognition and initial measurement Financial assets and liabilities, including accounts receivable and payable, are initially recognized when these assets are contractually originated or acquired, or when these liabilities are contractually issued or assumed. Financial assets and financial liabilities (unless it is an account receivable or account payable without a significant financing component) are measured and initially recognized at fair value, in the case of financial assets or liabilities not measured at fair value with changes through OCI, plus the transaction costs directly attributable to acquisition or issuance, when subsequently measured at amortized cost. An account receivable or account payable without a significant financing component is initially measured at the transaction price. If PEMEX determines that the fair value at the initial recognition differs from the transaction price, PEMEX shall recognize the difference between the fair value at initial the recognition and the transaction price in the consolidated statements of comprehensive income. ii. Classification and subsequent measurement Financial Assets – On initial recognition, a financial asset is classified as measured at: Amortized Cost; Fair Value Through Other Comprehensive Income (“FVTOCI”)-debt investment; FVTOCI–equity investment; or Fair Value Through Profit or Loss (“FVTPL”). Financial assets are not reclassified subsequent to their initial recognition unless PEMEX changes its business model for managing financial assets, in which case all affected financial assets are reclassified on the first day of the first reporting period following the change in the business model. FINANCIAL ASSETS MEASUREMENT Amortized cost A financial asset is measured at amortized cost if it meets both of the following conditions and is not designated as at FVTPL: •   it is held within a business model that has the objective of holding assets to collect contractual cash flows; and •   its contractual terms give rise on specified dates to cash flows that are solely payments of principal and interest on the principal amount outstanding. Debt investment A debt instrument is measured at FVTOCI only if it meets both of the following conditions and is not designated as at FVTPL: •   it is held within a business model that has the objective of both collecting contractual cash flows and selling financial assets; and •   its contractual terms give rise on specified dates to cash flows that are solely payments of principal and interest on the principal amount outstanding. Equity investment On initial recognition of an equity investment that is not held for trading, PEMEX may irrevocably elect to present subsequent changes in fair value in OCI. This election is made on an investment-by-investment All financial assets not classified as measured at amortized cost or FVTOCI (as described above) are measured at FVTPL. This includes all derivative financial assets (see Note 18). On initial recognition, PEMEX may irrevocably designate a financial asset that otherwise meets the requirements to be measured at amortized cost or at FVOCI as FVTPL, if doing so eliminates or significantly reduces an accounting mismatch that would otherwise arise. Financial assets: Business model assessment – PEMEX makes an assessment of the objective of the business model in which a financial asset is held at a portfolio level because this best reflects the way the business is managed and information is provided to management. The information considered includes: • the stated policies and objectives for the portfolio and the operation of those policies in practice, which include whether management’s strategy focuses on earning contractual interest income, maintaining a particular interest rate profile, matching the duration of the financial assets to the duration of any related liabilities or expected cash outflows or realizing cash flows through the sale of the assets; • how the performance of the portfolio is evaluated and reported to PEMEX management; • the risk that affects the performance of the business model (and the financial assets held within that business model) and how those risks are managed; • how managers of the business are compensated (e.g., whether compensation is based on the fair value of the assets managed or the contractual cash flows collected); and • the frequency, volume and timing of sales in prior periods, the reasons for such sales and expectations about future sales activity. Transfers of financial assets to third parties in transactions that do not qualify for derecognition are not considered sales for this purpose, consistent with PEMEX’s continuing recognition of the assets. Financial assets that are held for trading or managed and the performance of which is evaluated on a fair value basis are measured at FVTPL. Financial Asset: Assessment whether contractual cash flows are solely payments of principal and interest – For the purposes of this assessment, principal is defined as the fair value of the financial assets on initial recognition. Interest is defined as consideration for the time value of money and for the credit risk associated with the principal amount outstanding during the relevant period of time and for the basic lending risks and costs (e.g., liquidity risk and administrative costs), as well as profit margin. In assessing whether the contractual cash flows are solely payments of principal and interest, PEMEX considers the contractual terms of the instrument, which includes assessing whether the financial asset contains a contractual term that could change the timing or amount of contractual cash flows such that it would not meet this condition. In making this assessment, PEMEX considers: • contingent events that would change the amount or timing of cash flows; • terms that may adjust the contractual coupon rate, including variable rate features; • prepayment and extension features; and • terms that limit PEMEX’s claim to cash flows from specified assets (for example, non-recourse A prepayment feature is consistent solely with the payments of principal and interest criterion if the prepayment amount substantially represents unpaid amounts of principal and interest on the principal amount outstanding, which may include reasonable additional compensation for early termination of the contract. Additionally, for a financial asset acquired at a significant discount or premium to its contractual par amount, a feature that permits or requires prepayment at an amount that substantially represents the contractual par amount plus accrued (but unpaid) contractual interest (which may also include reasonable additional compensation for early termination) is treated as consistent with this criterion if the fair value of the prepayment feature is insignificant at initial recognition. Financial assets: Subsequent measurement and gain and losses – Financial assets at FVTPL Financial assets at FVTPL are measured at fair value and changes therein, including any interest or dividend income, are recognized in profit or loss. Financial assets at amortized cost These assets are subsequently measured at amortized cost using the effective interest method. The amortized cost is reduced by impairment losses. Interest income, foreign exchange gains and losses and impairment are recognized in profit or loss. Any gain or loss on derecognition is recognized in profit or loss. Debt investments at FVOCI These assets are subsequently measured at fair value. Interest income calculated using the effective interest method, foreign exchange gains and losses and impairment are recognized in profit or loss. Other net gains and losses are recognized in OCI. On derecognition, gains and losses accumulated in OCI are reclassified to profit or loss. Equity investments at FVOCI These assets are subsequently measured at fair value. Dividends are recognized as income in profit or loss unless the dividend clearly represents a recovery of part of the cost of the investment. Other net gains and losses are recognized in OCI and are never reclassified to profit or loss. Financial liabilities: Classification, subsequent measurement and gains and losses – Financial liabilities are classified as measured at amortized cost or FVTPL. A financial liability is classified as FVTPL if it is classified as held-for-trading, iii. Derecognition Financial assets – PEMEX derecognizes a financial asset when the contractual rights to the cash flows from the financial asset expire, or it transfers the rights to receive the contractual cash flows in a transaction in which substantially all of the risks and rewards of ownership of the financial asset are transferred or in which PEMEX neither transfers nor retains substantially all of the risks and rewards of ownership and it does not retain control of the financial asset. PEMEX enters into transactions whereby it transfers assets recognized in its statement of financial position but retains either all or substantially all of the risks and rewards of the transferred assets. In these cases, the transferred assets are not derecognized. Financial liabilities – PEMEX derecognizes a financial liability when its contractual obligations are discharged, cancelled or expired. PEMEX also derecognizes a financial liability when its terms are modified and the cash flows of the modified liability are substantially different, in which case a new financial liability based on the modified terms is recognized at fair value. On derecognition of a financial liability, the difference between the carrying amount extinguished and the consideration paid (including any non-cash iv. Offsetting Financial assets and financial liabilities are offset, and the net amount is presented in the statement of financial position when, and only when, PEMEX has a legally enforceable right to set off the amounts and it intends either to settle them on a net basis or to realize the asset and settle the liability simultaneously. v. Derivative financial instruments and hedge accounting PEMEX uses DFIs to hedge the risk exposure in foreign currency, interest rate and the price of commodities related to its products. Embedded derivatives are separated from the host contract and accounted for separately if the host contract is not a financial asset and certain criteria are met. These contracts are not accounted as designated hedging instruments. DFIs are accounted for as financial assets when the fair value is positive and as a financial liability when the fair value is negative. vi. Impairment Financial instruments and contract assets – PEMEX recognizes loss allowances for Estimated Credit Losses (“ECLs”) on: • financial assets measured at amortized cost; • debt investments measured at FVOCI; and • contract assets. PEMEX measures loss allowances at an amount equal to lifetime ECL, except for the following, which are measured as 12-month • debt securities that are determined to have low credit risk at the reporting date; and • other debt securities and bank balances for which credit risk (i.e. the risk of default occurring over the expected life of the financial instrument) has not increased significantly since initial recognition. PEMEX considers a financial asset to be in default when the debtor is unlikely to pay its credit obligations to PEMEX in full, without recourse by PEMEX to actions such as guarantee redemption (if any is held). PEMEX considers that a debt instrument has a low credit risk, when its credit rating is classified as “investment grade”. The investment grade classification is based on minimum credit ratings of Baa3 (Moody’s) and BBB- Lifetime ECLs are the credit losses that result from all possible default events over the expected life of a financial instrument. 12-month The maximum period considered when estimating ECLs is the maximum contractual period over which PEMEX is exposed to credit risk. Measurement of ECLs – ECLs are a probability-weighted estimate of credit losses. Credit losses are measured as the present value of all cash shortfalls (for example, the difference between the cash flows due to the entity in accordance with the contract and the cash flows that PEMEX expects to receive). Credit-impaired financial assets – At each reporting date, PEMEX assesses whether financial assets carried at amortized cost and debt securities at FVOCI are credit-impaired. A financial asset is ‘credit-impaired’ when one or more events that have a detrimental impact on the estimated future cash flows of the financial asset have occurred. Evidence that a financial asset is credit-impaired includes the following observable data: • significant financial difficulty of the borrower or issuer; • a breach of contract such as a default or being more than 90 days past due; • the restructuring of a loan or advance by PEMEX on terms that it would not consider otherwise; • it is probable that the borrower will enter bankruptcy or other financial reorganization; or • the disappearance of an active market for a security because of financial difficulties. Presentation of allowance for ECL in the statement of financial position – Loss allowances for financial assets measured at amortized cost are deducted from the gross carrying amount of the assets. Write-off The gross carrying amount of a financial asset is written off when PEMEX has no reasonable expectation of recovering a financial asset in its entirety or a portion thereof. In the case of individual customers, PEMEX’s policy is to cancel the gross carrying amount when the financial asset has met the uncollectibility report as established in the Pol í ticas Generales y Procedimientos para Cancelar Adeudos write-off write-off
Inventories and cost of sales	D. Inventories and cost of sales Inventories are valued at the lower of cost or net realizable value. Cost is determined based on the cost of production or acquisition of inventory and other costs incurred in transporting such inventory to its present location and in its present condition, using the average cost method. Net realizable value is the estimated selling price in the ordinary course of business less the estimated costs of completion and the estimated selling costs. The estimate takes into consideration, among other things, the decrease in the value of inventories due to obsolescence. Cost of sales represents the cost of production or acquisition of inventories at the time of sale, increased, where appropriate, by declines in net realizable value of inventories during the year. Advance payment to suppliers for inventory purchases are recognized as part of inventory when the risks and benefits of the ownership of the inventory have been transferred to PEMEX.
Wells, pipelines, properties, plant and equipment	E. Wells, pipelines, properties, plant and equipment i. Recognition and measurement Items of wells, pipelines, properties, plant and equipment are recorded at acquisition or construction cost, which includes capitalized borrowing cost, less accumulated depreciation and accumulated impairment losses. Initial costs of wells, pipelines, properties, plant and equipment are initially recorded at cost, which includes their original purchase price or construction cost, any costs attributable to bringing the assets to a working condition for their intended use and the costs of dismantling and removing the items and restoring the site on which they are located, including the estimated cost of plugging and abandoning wells. The cost of financing projects that require large investments and financing incurred for projects, net of interest revenues from the temporary investment of these funds, is recognized as part of wells, pipelines, properties, plant and equipment when the cost is directly attributable to the construction or acquisition of a qualifying asset. The capitalization of these costs is suspended during periods in which the development of construction is interrupted, and its capitalization ends when the activities necessary for the use of the qualifying asset are substantially completed. All other financing costs are recognized in the consolidated statements of comprehensive income in the period in which they are incurred. The cost of self-constructed assets includes the cost of materials and direct labor, interest on financing and any other costs directly attributable to start up. In some cases, the cost also includes costs of plugging of wells and removal at present value. Expenditures related to the construction of wells, pipelines, properties, plant and equipment during the stage prior to commissioning are stated at cost as intangible assets or construction in progress, in accordance with the characteristics of the asset. Once the assets are ready for use, they are transferred to the respective component of wells, pipelines, properties, plant and equipment and depreciation or amortization begins. If significant parts of an item of wells, pipelines, properties, plant and equipment have different useful lives, then they are accounted for as separate items (major components) of property, plant and equipment. Any gain or loss on disposal of an item of wells, pipelines, properties, plant and equipment is recognized in profit or loss. Advance payments for the acquisition of pipelines, properties, plant and equipment are also recognized in the line item of wells, pipelines, properties, plant and equipment when the risks and benefits of the ownership have been transferred to PEMEX. ii. Subsequent expenditure The costs of major maintenance or replacement of a significant component of an item of wells, pipelines, properties, plant and equipment are recognized in the carrying amount of the item if it is probable that the future economic benefits embodied within the component will flow to PEMEX and its cost can be measured reliably. The costs of recurring maintenance, repairs and renovations of wells, pipelines, properties, plant and equipment carried out to maintain the facilities in normal operation conditions are recognized in profit or loss as incurred. iii. Depreciation Depreciation and amortization of capitalized costs in wells are determined based on the estimated economic life of the field to which the wells belong, considering the relationship between the production of barrels of oil equivalent for the period and proved developed reserves of the field, as of the beginning of the period, with quarterly updates for new development investments. Depreciation of other elements of pipelines, properties, plant and equipment is recognized in profit or loss on a straight-line basis over the estimated useful life of the asset, beginning as of the date that the asset is available for use, or in the case of construction, from the date that the asset is completed and ready for use. Until December 2018, properties, plant and equipment acquired through financial leases were depreciated over the shorter of the lease term or the useful life of the asset. The estimated useful lives of wells, pipelines, properties, plant and equipment for current and comparative periods are described in Note 13. Estimated useful lives of items of properties, plant and equipment are reviewed and updated prospectively if expectations differ from previous estimates.
Intangible assets and oil and natural gas exploration and license, appraisal and development expenditure	F. Intangible assets and oil and natural gas exploration and license, appraisal and development expenditure i. Intangible assets Intangible assets acquired separately are measured at initial recognition at their acquisition cost. After the initial recognition, intangible assets are valued at their acquisition cost, less: (i) accumulated amortization, under the straight-line method during the estimated useful life of the intangible asset and (ii) accumulated impairment losses. Subsequent expenditure is capitalised only when it increases the future economic benefits embodied in the specific asset to which it relates. All other expenditure is recognized in profit or loss as incurred. Software licenses are amortized over the lesser of their contract period or the remaining life of the asset to which they are associated. The estimated useful lives of elements of intangible assets for current and comparative periods are described in Note 14. The estimated useful lives and residual values of intangible assets are reviewed at each reporting date and adjusted if appropriate. ii. Wells not assigned to a reserve, oil and natural gas exploration, appraisal and development expenditure a. Wells not assigned to a reserve Wells not assigned to a reserve mainly include drilling, evaluation and development costs for oil and natural gas, and rights-of-way. b. Oil and natural gas exploration, appraisal and development expenditures Oil and natural gas exploration, evaluation and development expenses are accounted for using the principles of the successful efforts method of accounting, as described below: Successful Efforts Method – Pemex Exploration and Production applies IFRS 6 - Exploration and Evaluation of Mineral Resources, which allows an entity to develop an accounting policy for exploration and evaluation assets. Therefore, Pemex Exploration and Production uses the method of successful efforts, which requires a cause and effect relationship between the costs incurred and the recognition of specific reserves. Generally, if a cost is incurred without an identifiable future benefit, it is charged to expenses. Before PEMEX is able to determine the accounting treatment of a cost, it must be classified as a property acquisition, exploration, development or production cost. Exploration and appraisal expenditure – Geological and geophysical exploration costs including topographic costs, geological studies, property access rights, remuneration and expenses of geologists and geophysicists are charged to expenses as incurred. Costs directly associated with an exploration well, other than the costs mentioned in the preceding paragraph, are initially capitalized as an intangible asset (wells not assigned to a reserve) until the drilling of the well is complete and the results have been evaluated. These costs include employee compensation, materials and fuel used, platform costs and payments made to contractors. If potentially commercial quantities of hydrocarbons are not found, the exploration well costs are written off against profit or loss. If hydrocarbons are found and, subject to additional assessment activity, are likely to be capable of commercial development, the costs continue to be carried as an asset. If it is determined that development will not occur, then the costs are expensed against profit or loss. Costs directly associated with the evaluation activity performed to determine the size, characteristics and commercial potential of a reserve after the initial hydrocarbon discovery, including the costs of evaluation of wells where no hydrocarbons were found, are initially capitalized as an intangible asset (wells not assigned to a reserve). When proved reserves of oil and natural gas are determined and development is approved by management, the relevant expenditure is transferred to wells, pipelines, properties, plant and equipment. Exploration wells more than 12 months old are recognized as an expense unless: (a)(i) they are in an area requiring major capital expenditure before production can begin, (ii) commercially productive quantities of reserves have been found, and (iii) they are subject to further exploration or appraisal activity, in that, either drilling or additional exploration wells are underway or firmly planned for the near future or (b) proved reserves are recorded within 12 months of completion of the exploratory drilling. PEMEX periodically assesses the amounts included within fixed assets to determine whether capitalization is initially appropriate and can continue. Exploration wells capitalized beyond 12 months are subject to additional scrutiny as to whether the facts and circumstances have changed and therefore whether the conditions described in the preceding paragraph no longer apply. Development expenditure – Expenditure on the construction, installation and completion of infrastructure facilities such as platforms, pipelines and the drilling of development wells, including service and unsuccessful development or delineation wells, is capitalized within wells, pipelines, properties, plant and equipment and is depreciated from the commencement of production as described in the accounting policy for wells, pipelines, properties, plant and equipment. Exploration – Exploration includes all expenses related to the search for oil and / or gas reserves, including depreciation and applicable costs of supporting equipment and facilities, and the costs of drilling exploratory wells and exploratory stratigraphic wells. Some exploration costs are charged directly to expenses when they occur, such as the costs of maintaining unexploited properties, since such costs do not increase the possibilities that said lands contain proven reserves. The costs of geologists, topographers and geophysicists, including wages and other related expenses, are also charged directly to expenses when they occur because they do not represent the acquisition of an identifiable asset since these studies represent research expenses. All costs for drilling exploratory wells are capitalized and classified as wells, pipelines, property, plant and equipment, not associated with a reserve, until it is determined whether or not a well has proven reserves. Once the exploratory wells are completed, the future treatment of these costs is determined. Development – Development costs are associated with previously discovered proven reserves, with previously known future benefits. Therefore, all costs incurred in development activities must be capitalized. Development includes all costs incurred in creating a system of productive wells, related equipment, and facilities in proven reserves so that oil and / or gas can be extracted. Developmental costs are related to specific proven reserves. The cost of building roads to gain access to proven reserves is a development cost, as is the cost of providing facilities for the extraction, treatment, collection and storage of oil and / or gas. Developmental costs also include depreciation and operating costs of equipment and facilities used in developmental activities. Likewise, non-productive Production – Production includes the costs incurred to raise oil and / or gas to the surface, its collection, treatment, processing and field storage. The production function ends in the storage tank of the production field or, in exceptional circumstances, at the first point of delivery of the oil and / or gas to the main line, refinery, marine terminal or common transport.
Crude oil and natural gas reserves	G. Crude oil and natural gas reserves Under Mexican law, all crude oil and other hydrocarbon reserves located in the subsoil of Mexico are owned by the Mexican nation and not by PEMEX. In accordance with the aforementioned and based on the applicable regulation as of the date of these consolidated financial statements, the reserves assigned to PEMEX by the Mexican Government are not registered for accounting purposes because they are not PEMEX’s property. PEMEX estimates total proved oil and natural gas reserve volumes in accordance with the definitions, methods and procedures established in Rule 4-10(a) S-X 4-10(a)”) Although PEMEX does not own the oil and other hydrocarbon reserves within Mexico, these procedures allow PEMEX to record the effects that such oil and other hydrocarbon reserves have on its consolidated financial statements, including, for example, in the depreciation and amortization line item.
Impairment of non-financial assets	H. Impairment of non-financial The carrying amounts of PEMEX’s non-financial A cash-generating unit is the smallest identifiable group of assets which can generate cash flows independently from other assets or groups of assets. The recoverable amount of an asset or a Cash-Generating Unit (“CGU”) is defined as the higher of its fair value minus the costs of disposal and its value in use. The value in use is the discounted present value of the net future cash flows expected to arise from the continuing use of an asset and from its disposal at the end of its useful life. In measuring value in use, the discount rate applied is the pre-tax In the case of cash-generating assets or items dedicated to the exploration and evaluation of hydrocarbons reserves, the recoverable amount is determined using the value in use based on the proved reserves and probable reserves, in some cases, for the risk factor associated with such reserves. Both impairment losses and reversals are recognized in the statement of comprehensive income in the costs and expenses line items in which the depreciation and amortization are recognized. Impairment losses may not be presented as part of the costs that have been capitalized in the value of any asset. Impairment losses related to inventories are recognized as part of cost of sales. Impairment losses on investments in associates, joint ventures and other investments are recognized as profit (loss) sharing in associates. An impairment loss shall be reversed if there has been a change in the estimates used since the date when the impairment loss was recognized. These reversals will not exceed the carrying value of the asset as though no impairment had been recognized. Impairment losses and reversals are presented in a separate line item in the consolidated statement of comprehensive income.
Leases	I. Leases PEMEX has applied IFRS 16 using the modified retrospective approach and therefore the comparative information for 2018 has not been restated and continues to be reported under IAS 17 and IFRIC 4. The details of accounting policies under IAS 17 and IFRIC 4 are disclosed separately. Policy applicable after January 1, 2019 At the inception of a contract, PEMEX assesses whether a contract is, or contains, a lease. A contract is, or contains, a lease if the contract conveys the right to control the use of an identified asset for a period of time in exchange for consideration. To assess whether a contract conveys the right to control the use of an identified asset, PEMEX uses the definition of a lease in IFRS 16. As a lessee – At commencement or on modification of a contract that contains a lease component, PEMEX allocates the consideration in the contract to each lease component on the basis of its relative stand-alone prices. However, PEMEX has elected for some leases not to separate non-lease non-lease PEMEX recognizes a right-of-use right-of-use The right-of-use right-of-use right-of-use right-of-use The lease liability is initially measured at the present value of the lease payments that are not paid at the commencement date, discounted using the interest rate implicit in the lease or, if that rate cannot be readily determined, PEMEX’s incremental borrowing rate. Generally, PEMEX uses its incremental borrowing rate as the discount rate. PEMEX determines its incremental borrowing rate by obtaining interest rates from various external financing sources and makes certain adjustments to reflect the terms of the lease and type of the asset leased. Lease payments included in the measurement of the lease liability comprise the following: • fixed payments, including in-substance • variable lease payments that depend on an index or a rate, initially measured using the index or rate as at the commencement date; • amounts expected to be payable under a residual value guarantee; and • the exercise price under a purchase option that PEMEX is reasonably certain to exercise, lease payments in an optional renewal period if PEMEX is reasonably certain to exercise an extension option, and penalties for early termination of a lease unless PEMEX is reasonably certain not to terminate early. The lease liability is measured at amortized cost using the effective interest method. It is remeasured when there is a change in future lease payments arising from a change in an index or rate, if there is a change in PEMEX’s estimate of the amount expected to be payable under a residual value guarantee, if PEMEX changes its assessment of whether it will exercise a purchase, extension or termination option or if there is a revised in-substance When the lease liability is remeasured in this way, a corresponding adjustment is made to the carrying amount of the right-of-use right-of-use PEMEX presents separately the right-of-use Short-term leases and leases of low-value PEMEX has elected not to recognize right-of-use low-value Policy applicable before January 1, 2019 – For contracts entered into before January 1, 2019, PEMEX determined whether the arrangement was or contained a lease based on the assessment of whether: • fulfilment of the arrangement was dependent on the use of a specific asset or assets; and • the arrangement had conveyed a right to use the asset. An arrangement conveyed the right to use the asset if one of the following was met: • the purchaser had the ability or right to operate the asset while obtaining or controlling more than an insignificant amount of the output; • the purchaser had the ability or right to control physical access to the asset while obtaining or controlling more than an insignificant amount of the output; or • facts and circumstances indicated that it was remote that other parties would take more than an insignificant amount of the output, and the price per unit was neither fixed per unit of output nor equal to the current market price per unit of output. As a lessee – As a lessee, PEMEX classified leases that transferred substantially all of the risks and rewards of ownership as finance leases. When this was the case, the leased assets were measured initially at an amount equal to the lower of their fair value and the present value of the minimum lease payments. Minimum lease payments were the payments over the lease term that the lessee was required to make, excluding any contingent rent. Subsequent to initial recognition, the assets were accounted for in accordance with the accounting policy applicable to that asset. Assets held under other leases were classified as operating leases and were not recognized in PEMEX’s statement of financial position. Payments made under operating leases were recognized in profit or loss on a straight-line basis over the term of the lease. Lease incentives received were recognized as an integral part of the total lease expense, over the term of the lease.
Provisions	J. Provisions Provisions are determined by discounting the expected future cash flows at a pre-tax PEMEX recognizes provisions when, as a result of a past event, PEMEX has incurred a legal or assumed present obligation for which a future disbursement is probable and the value of such disbursement is reasonably estimable. In certain cases, such amounts are recorded at their present value. Environmental liabilities – In accordance with applicable legal requirements and accounting practices, an environmental liability is recognized when the cash outflows are probable and the amount is reasonably estimable. Disbursements related to the conservation of the environment that are linked to revenue from current or future operations are accounted as expenses or assets, depending on the circumstances of each disbursement. Disbursements related to past operations, which no longer contribute to current or future revenues, are accounted for as current period expenses. The accrual of a liability for a future disbursement occurs when an obligation related to environmental remediation, for which PEMEX has the information necessary to determine a reasonable estimated cost, is identified. Retirement of assets – The obligations associated with the future retirement of assets, including those related to the retirement of wells, pipelines, properties, plant and equipment and their components are recognized at the date that the retirement obligation is incurred, based on the discounted cash flow method. The determination of the fair value is based on existing technology and regulations. If a reliable estimation of fair value cannot be made at the time the obligation is incurred, the accrual will be recognized when there is sufficient information to estimate the fair value. The obligations related to the costs of future retirement of assets associated with the principal refining processes for gas and petrochemicals are not recognized. These assets are considered to have an indefinite useful life due to the potential for maintenance and repairs. The abandonment costs related to wells currently in production and wells temporarily closed are recorded in the statement of comprehensive income based on the units of production method. Total cost of abandonment and plugging for non-producing All estimations are based on the useful lives of the wells, considering their discounted present value. Salvage values are not considered, as these values commonly have not traditionally existed.
Employee benefits	K. Employee benefits i. Short-term employee benefits Short-term employee benefits are expensed as the related service is provided. A liability is recognized for the amount expected to be paid if PEMEX has a present legal or constructive obligation to pay this amount as a result of past service provided by the employee and the obligation can be estimated reliably. ii. Defined contribution plans Obligations for contributions to defined contribution plans are expensed as the related service is provided. Prepaid contributions are recognized as an asset to the extent that a cash refund or a reduction in future payments is available. iii. Defined benefit plan PEMEX’s net obligation in respect of defined benefit plans is calculated separately for each plan by estimating the amount of future benefit that employees have earned in the current and prior periods, discounting that amount and deducting the fair value of any plan assets. The calculation of defined benefit obligations is performed annually by a qualified actuary using the projected unit credit method. When the calculation results in a potential asset for PEMEX, the recognized asset is limited to the present value of economic benefits available in the form of any future refunds from the plan or reductions in future contributions to the plan. To calculate the present value of economic benefits, consideration is given to any applicable minimum funding requirements. New remeasurements of the net defined benefit liability, which comprise actuarial gains and losses, the return on plan assets (excluding interest) and the effect of the asset ceiling (if any, excluding interest), are recognized immediately in OCI. PEMEX determines the net interest expense (income) on the net defined benefit liability (asset) for the period by applying the discount rate used to measure the defined benefit obligation at the beginning of the annual period to the net defined benefit liability (asset) at such time, taking into account any changes in the net defined benefit liability (asset) during the period as a result of contributions and benefit payments. Net interest expense and other expenses related to defined benefit plans are recognized in profit or loss. When the benefits of a plan are changed or when a plan is curtailed, the resulting change in benefit that relates to past service or the gain or loss on curtailment is recognized immediately in profit or loss. PEMEX recognizes gains and losses from the settlement of a defined benefit plan when the settlement occurs. iv. Other long-term employee benefits PEMEX’s net obligation in respect of long-term employee benefits is the amount of future benefit that employees have earned in return for their service in the current and prior periods. That benefit is discounted to determine its present value. New remeasurements are recognized in profit or loss in the period in which they arise. v. Termination benefits Termination benefits are expensed at the earlier of when PEMEX can no longer withdraw its offer of those benefits and when PEMEX recognizes costs for a restructuring. If benefits are not expected to be settled in full within 12 months of the reporting date, then they are discounted.
Short-term employee benefits	i. Short-term employee benefits Short-term employee benefits are expensed as the related service is provided. A liability is recognized for the amount expected to be paid if PEMEX has a present legal or constructive obligation to pay this amount as a result of past service provided by the employee and the obligation can be estimated reliably.
Defined contribution plans	ii. Defined contribution plans Obligations for contributions to defined contribution plans are expensed as the related service is provided. Prepaid contributions are recognized as an asset to the extent that a cash refund or a reduction in future payments is available.
Defined benefit plan	iii. Defined benefit plan PEMEX’s net obligation in respect of defined benefit plans is calculated separately for each plan by estimating the amount of future benefit that employees have earned in the current and prior periods, discounting that amount and deducting the fair value of any plan assets. The calculation of defined benefit obligations is performed annually by a qualified actuary using the projected unit credit method. When the calculation results in a potential asset for PEMEX, the recognized asset is limited to the present value of economic benefits available in the form of any future refunds from the plan or reductions in future contributions to the plan. To calculate the present value of economic benefits, consideration is given to any applicable minimum funding requirements. New remeasurements of the net defined benefit liability, which comprise actuarial gains and losses, the return on plan assets (excluding interest) and the effect of the asset ceiling (if any, excluding interest), are recognized immediately in OCI. PEMEX determines the net interest expense (income) on the net defined benefit liability (asset) for the period by applying the discount rate used to measure the defined benefit obligation at the beginning of the annual period to the net defined benefit liability (asset) at such time, taking into account any changes in the net defined benefit liability (asset) during the period as a result of contributions and benefit payments. Net interest expense and other expenses related to defined benefit plans are recognized in profit or loss. When the benefits of a plan are changed or when a plan is curtailed, the resulting change in benefit that relates to past service or the gain or loss on curtailment is recognized immediately in profit or loss. PEMEX recognizes gains and losses from the settlement of a defined benefit plan when the settlement occurs.
Other long-term employee benefits	iv. Other long-term employee benefits PEMEX’s net obligation in respect of long-term employee benefits is the amount of future benefit that employees have earned in return for their service in the current and prior periods. That benefit is discounted to determine its present value. New remeasurements are recognized in profit or loss in the period in which they arise.
Termination benefits	v. Termination benefits Termination benefits are expensed at the earlier of when PEMEX can no longer withdraw its offer of those benefits and when PEMEX recognizes costs for a restructuring. If benefits are not expected to be settled in full within 12 months of the reporting date, then they are discounted.
Income taxes, duties and royalties	L. Income taxes, duties and royalties Income tax expense comprises current and deferred tax. It is recognized in profit or loss except to the extent that it relates to a business combination, or items recognized directly in equity or in OCI. The interest and penalties related to income taxes, including uncertain tax treatments, do not meet the definition of income taxes, and are therefore accounted for under IAS 37 “Provisions, Contingent Liabilities and Contingent Assets.” i. Current income tax Current income tax comprises the expected tax payable or receivable on the taxable income or loss for the year and any adjustment to the tax payable or receivable in respect of previous years. The amount of current tax payable or receivable is the best estimate of the tax amount expected to be paid or received that reflects uncertainty related to income taxes, if any. It is measured using tax rates enacted or substantively enacted at the reporting date. Current tax also includes any tax arising from dividends. Current tax assets and liabilities are offset only if certain criteria are met. ii. Deferred income tax Deferred income tax is recognized in respect of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for taxation purposes. Deferred tax is not recognized for: • temporary differences on the initial recognition of assets or liabilities in a transaction that is not a business combination and that affects neither accounting nor taxable profit or loss; • temporary differences related to investments in subsidiaries, associates and joint arrangements to the extent that PEMEX is able to control the timing of the reversal of the temporary differences and it is probable that they will not reverse in the foreseeable future; and • taxable temporary differences arising from the initial recognition of goodwill. Deferred tax assets are recognized for unused tax losses, unused tax credits and deductible temporary differences to the extent that it is probable that future taxable profits will be available against which they can be used. Future taxable profits are determined based on the reversal of relevant taxable temporary differences. If the amount of taxable temporary differences is insufficient to recognize a deferred tax asset in full, then future taxable profits, adjusted for reversals of existing temporary differences, are considered, based on the business plans of PEMEX. Deferred tax assets are reviewed at each reporting date and are reduced to the extent that it is no longer probable that the related tax benefit will be realized. Such reductions are reversed when the probability of future taxable profits improves. Unrecognized deferred tax assets are reassessed at each reporting date and recognized to the extent that it has become probable that future taxable profits will be available against which they can be used. Deferred tax is measured at the tax rates that are expected to be applied to temporary differences when they reverse, using tax rates enacted or substantively enacted at the reporting date. The measurement of deferred tax reflects the tax consequences that would follow from the manner in which PEMEX expects, at the reporting date, to recover or settle the carrying amount of its assets and liabilities. Deferred tax assets and liabilities are offset only if certain criteria are met. iii. Duties, royalties and considerations Duties – PEMEX is subject to taxes and special duties, which are based on the value of hydrocarbons extracted, with certain deductions. These taxes and duties are recognized in accordance with IAS 12, “Income Taxes” (IAS 12), when they have the characteristics of income tax, which occurs when such taxes are set by a government authority and are determined based on a formula that considers the balance of income (or extraction valued at a selling price) less expenses. Taxes and duties that meet these criteria are recognized for current and deferred income tax based on the above paragraphs. Taxes and duties that do not meet these criteria are recognized in costs and expenses relating to the transactions that gave rise to them. Royalties and considerations – Royalties and considerations are payable pursuant to license agreements. These royalties are recognized as liabilities and affect the items of costs and expenses related to the operations that gave rise to them.
Contingencies	M. Contingencies Contingency losses are recorded when it is probable that a liability has been incurred and the amount thereof can be reasonably estimated. When a reasonable estimation cannot be made, qualitative disclosure is provided in the notes to the consolidated financial statements. Contingent assets are not recognized until realization is assured.
Fair value	N. Fair value ‘Fair value’ is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date in the principal or, in its absence, the most advantageous market to which PEMEX has access at that date. The fair value of a liability reflects its non-performance A number of PEMEX accounting policies and disclosures require the measurement of fair values, for both financial and non-financial When one is available, PEMEX measures the fair value of an instrument using the quoted price in an active market for that instrument. A market is regarded as ‘active’ if transactions for the asset or liability take place with sufficient frequency and volume to provide pricing information on an ongoing basis. If there is no quoted price in an active market, then PEMEX uses valuation techniques that maximize the use of relevant observable inputs and minimize the use of unobservable inputs. The chosen valuation technique incorporates all of the factors that market participants would take into account in pricing a transaction. If an asset or a liability measured at fair value has a bid price and an ask price, then PEMEX measures assets and long positions at the bid price and liabilities and short positions at the ask price. The best evidence of the fair value of a financial instrument on initial recognition is normally the transaction price (i.e., the fair value of the consideration given or received in a third-party transaction). If PEMEX determines that the fair value on initial recognition differs from the transaction price and the fair value is evidenced neither by a quoted price in an active market for an identical asset or liability nor based on a valuation technique for which any unobservable inputs are judged to be insignificant in relation to the measurement, then the financial instrument is initially measured at fair value, adjusted to defer the difference between the fair value on initial recognition and the transaction price. Subsequently, that difference is recognized in profit or loss on an appropriate basis over the life of the instrument but no later than when the valuation is fully supported by observable market data or the transaction is closed out.
Revenue from contracts with customers	O. Revenue from contracts with customers Revenue is measured based on the consideration specified in a contract with a customer. PEMEX recognizes revenue when it transfers control over a good or service to a customer (see Note 7).
Operating segments	P. Operating segments Operating segments are identifiable components of PEMEX that pursue business activities from which PEMEX earns revenues and incurs expenses and for which information is available to management on a segmented basis and is assessed by the Board of Directors in order to allocate resources and assess the profitability of the segments.
Presentation of consolidated statements of comprehensive income	Q. Presentation of consolidated statements of comprehensive income Costs and expenses shown in PEMEX’s consolidated statements of income are presented based on their function, which allows for a better understanding of the components of PEMEX’s operating income. This classification allows for a comparison to the industry to which PEMEX belongs. i. Operating profit Operating profit is the result generated from the continuing principal revenue-producing activities of PEMEX as well as other income and expenses related to operating activities. Operating profit excludes net finance costs, share of profit of equity-accounted investees and income taxes and duties. Revenues – Represents revenues from the sale of products or services. Cost of sales – Cost of sales represents the acquisition and production costs of inventories, depreciation, amortization, salaries, wages and benefits, a portion of the cost of the reserve for employee benefits and operating expenses related to the production process, production taxes and duties, exploration costs, non-operating Other revenues and other expenses – Other revenues and other expenses consist primarily of income and expenses that are not related directly to the operation of PEMEX. Transportation, distribution and sale expenses – Transportation, distribution and sale expenses are costs in connection with the storage, sale and delivery of products, such as the depreciation and operating expenses associated with these activities. Administrative expenses – Administrative expenses are costs related to PEMEX’s areas that provide administrative support. ii. Financing income and financing cost and derivative financial instruments income (cost), net Financing income – Financing income is comprised of interest income, financial income and other income from financial operations between PEMEX and third parties. Financing cost – Financing cost is comprised of interest expenses, commissions and other expenses related to PEMEX’s financing operations less any portion of the financing cost that is capitalized. When calculating interest income and expenses, the effective interest rate is applied to the gross carrying amount of the asset (when the asset has no credit impairment), to the amortized cost of the liability or to the present value lease liabilities. However, for financial assets with credit impairment after initial recognition, interest income is calculated by applying the effective interest rate at the amortized cost of the financial asset. If the asset ceases to be impaired, the interest income calculation returns to the gross base. Derivative financial instruments income (cost), net – Includes the result of changes in the fair value of derivative financial instruments.

Accounting Changes Splits Adj_2

Accounting Changes Splits Adjustments Reclassifications and Corrections of Non-Material Errors (Tables)	12 Months Ended
	Dec. 31, 2020
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Summary of Impact on Transition to IFRS 16	On transition to IFRS 16 (effective as of January 1, 2019), PEMEX recognized additional right-of-use Total Right of use assets Ps. 72,760,580 * Lease liability Ps. 70,651,797 * Includes the reclassification of rights of way that were presented as intangible assets. The liability is not recognized due to prepayments made.
Summary of Measuring Lease Liabilities for Leases	When measuring lease liabilities for leases that were classified as operating leases, PEMEX discounted lease payments using its incremental borrowing rate at January 1, 2019. The weighted-average rate applied was 7.7%. 2019 Operating lease commitment at December 31, 2018 Ps. 62,723,909 Undisclosed leases in 2018 Financial statements 40,186,551 Operating lease commitment 102,910,460 Operating lease commitment discounted using the incremental borrowing rate at January 1, 2019 Ps. 65,608,174 Lease liabilities from financial leases previously recognized up to December 31, 2018 6,053,280 Recognition exemption for: Short-term leases (1,009,657 ) Lease liabilities recognized at January 1, 2019 Ps. 70,651,797
Summary Of Consolidated Statement of Financial Position	Consolidated Statement of Financial Position Line item Note 2019 Previously Reclassification Adjustment of 2019 Updated Other accounts receivable (i) Ps. 91,241,811 (91,241,811 ) — — Other financing receivables 10-B — 31,416,091 — 31,416,091 Other non-financing 10-B — 59,825,720 — 59,825,720 Other current assets (ii) 346,563 2,482,670 — 2,829,233 Total current assets 340,552,371 2,482,670 — 343,035,041 Wells, pipelines, properties, plant and equipment, net 1,211,749,502 — 65,799,060 1,277,548,562 Other assets (ii) 7,136,677 (2,482,670 ) — 4,654,007 Total non-current 1,577,895,649 (2,482,670 ) 65,799,060 1,641,212,039 Accumulated deficit from prior years (1,933,106,785 ) — — (1,933,106,785 ) Net loss for the year (347,289,362 ) — 65,799,060 (281,490,302 ) Total equity (deficit) (1,997,208,362 ) — 65,799,060 (1,931,409,302 )
Summary Of Consolidated Statement of Comprehensive income	Consolidated Statement of Comprehensive income Line item 2019 Previously Reclassification Adjustment of 2019 Updated Cost of sales Ps. 1,122,933,424 — — 1,122,933,424 (Impairment) reversal of impairment of wells, pipelines, properties, plant and equipment, net (97,082,214 ) — 65,799,060 (31,283,154 ) Total cost of sales, net 1,220,015,638 — 65,799,060 1,154,216,578 Finance income 24,483,706 4,751,897 — 29,235,603 Derivative financial instruments (cost) income, net (18,512,026 ) (4,751,897 ) — (23,263,923 ) Sum of financing (costs) net, derivative instruments (cost) and foreign exchange gains, net (39,959,272 ) — — (39,959,272 ) Net loss (347,911,084 ) — 65,799,060 (282,112,024 ) Consolidated Statement of Comprehensive income Line item 2018 Previously Reclassification 2018 Updated Finance cost Ps. (120,727,022 ) (3,142,662 ) (123,869,684 ) Derivative financial instruments (cost) income, net 22,258,613 3,142,662 (19,115,951 ) Sum of financing (costs) net, derivative instruments (cost) and foreign exchange gains, net (87,769,033 ) — (87,769,033 ) Net loss (180,419,837 ) — (180,419,837 )
Summary Of Consolidated Statement of Cash Flow Statement	Consolidated Statement of cash flows Line item 2019 Previously Reclassification Adjustment of 2019 Updated Net loss Ps. (347,911,084 ) — 65,799,060 (282,112,024 ) (Impairment) reversal of impairment) deterioration of wells, pipelines, properties, plant and equipment, net 97,082,214 — (65,799,060 ) 31,283,154 Interest income (24,483,706 ) (4,751,897 ) — (29,235,603 ) Funds from operating activities 351,322,756 (4,751,897 ) — 346,570,859 Accounts receivable (13,285,925 ) 4,751,897 — (8,534,028 ) Net cash flows from operating activities 85,220,514 — — 85,220,514 Consolidated Statement of cash flows Line item 2018 Previously Reclassification 2018 Updated Interest expense 120,727,022 3,142,662 123,869,684 Funds from operating activities 513,218,562 3,142,662 516,361,224 Accounts receivable (286,509 ) (3,142,662 ) (3,429,171 ) Net cash flows from operating activities 141,786,590 — 141,786,590

Segment financial information (

Segment financial information (Tables)	12 Months Ended
	Dec. 31, 2020
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Condensed Financial Information of Segments after Elimination of Unrealized Intersegment Gain (Loss)	The following tables present the condensed financial information of these segments, after elimination of unrealized intersegment gain (loss), and include only select line items. The columns before intersegment eliminations include unconsolidated figures. As a result, the line items presented below may not total. These reporting segments are those which PEMEX’s management evaluates in its analysis of PEMEX and on which it bases its decision-making. These reporting segments are presented in PEMEX’s reporting currency. As of/ for the year ended December 31, 2020 Exploration and Production Industrial Logistics Fertilizers (1) Trading Companies Corporate and Other Intersegment eliminations Total Sales: Trade 301,393,451 477,729,504 — 1,515,464 159,786,736 8,521,205 — 948,946,360 Intersegment 242,454,754 97,303,328 80,575,471 425,374 280,924,383 98,451,594 (800,134,904 ) — Services income 133,315 190,748 4,099,000 919 229,140 62,362 — 4,715,484 (Impairment) reversal of wells, pipelines, properties, plant and equipment, net 35,031,541 (71,761,571 ) 426,560 (92,444 ) 42,214 — — (36,353,700 ) Cost of sales 391,513,815 655,617,229 43,614,768 3,070,962 430,672,407 27,536,221 (719,410,712 ) 832,614,690 Gross income (loss) 187,499,246 (152,155,220 ) 41,486,263 (1,221,649 ) 10,310,066 79,498,940 (80,724,192 ) 84,693,454 Other revenue 2,162,510 4,092,943 513,076 13,355 874,412 4,112,550 — 11,768,846 Other expenses (896,526 ) (130,926 ) (7,445 ) 6,204 (86,960 ) (113,590 ) 34,529 (1,194,714 ) Distribution, transportation and sales expenses 251,625 14,423,570 107,691 400,170 1,277,980 209,676 (4,234,470 ) 12,436,242 Administrative expenses 72,457,241 51,017,304 15,762,946 1,099,456 2,106,780 79,922,661 (76,471,944 ) 145,894,444 Operating income (loss) 116,056,364 (213,634,077 ) 26,121,257 (2,701,716 ) 7,712,758 3,365,563 16,751 (63,063,100 ) Financing income 77,700,999 223,712 3,340,622 245,510 307,229 162,801,375 (227,877,399 ) 16,742,048 Financing cost (164,419,519 ) (11,491,708 ) (450,802 ) (674,869 ) (812,552 ) (211,776,436 ) 227,860,644 (161,765,242 ) Derivative financial instruments (cost) income, net 24,939,748 22,862 — — (1,794,243 ) (6,072,226 ) — 17,096,141 Foreign exchange (loss), net (116,528,387 ) (8,893,829 ) (442,139 ) (166,971 ) (750,041 ) (2,167,937 ) — (128,949,304 ) (Loss) profit sharing in joint ventures and associates (61,956 ) 1,346,829 3,813 (2,362,891 ) (1,931,323 ) (441,711,566 ) 441,176,561 (3,540,533 ) Taxes, duties and other 154,609,136 — 4,842,171 — 3,413,999 22,706,769 — 185,572,075 Net (loss) income (216,921,887 ) (232,426,211 ) 23,730,580 (5,660,937 ) (682,171 ) (518,267,996 ) 441,176,557 (509,052,065 ) Total current assets 937,017,021 152,553,067 166,202,857 2,960,958 168,261,357 906,149,787 (2,003,285,308 ) 329,859,739 Total non-current 884,741,960 328,449,091 167,498,268 3,404,696 40,084,813 750,322,623 (575,873,262 ) 1,598,628,189 Total current liabilities 464,163,895 388,367,873 39,568,364 17,328,604 129,161,357 1,734,633,918 (2,000,813,940 ) 772,410,071 Total non-current 2,363,252,154 714,289,669 90,624,955 453,465 1,121,488 2,218,921,311 (1,827,858,155 ) 3,560,804,887 Equity (deficit), net (1,005,657,068 ) (621,655,384 ) 203,507,806 (11,416,415 ) 78,063,325 (2,297,082,819 ) 1,249,513,525 (2,404,727,030 ) Depreciation and amortization 101,126,295 19,734,723 5,917,668 10,137 317,241 2,525,756 — 129,631,820 Depreciation of rights of use 313,008 4,679,723 460,957 35,515 992,148 747,880 — 7,229,231 Net periodic cost of employee benefits excluding items recognized in other comprehensive income 35,356,366 51,176,601 8,927,651 669,076 (1,156 ) 32,680,002 — 128,808,540 (1) Merged as of January 1, 2021, see Note 28-E. As of/ for the year ended December 31, 2019 Exploration and Production (1) Industrial (2) Logistics Fertilizers Trading Corporate and Other Intersegment eliminations Total Sales: Trade 409,059,838 797,167,115 — 1,634,300 175,509,189 9,492,063 — 1,392,862,505 Intersegment 333,735,644 127,887,636 88,604,529 560,987 484,139,042 100,021,336 (1,134,949,174 ) — Services income 473,324 2,088,771 4,663,770 853 67,982 1,813,980 — 9,108,680 (Impairment) reversal of wells, pipelines, properties, plant and equipment, net (3) (104,035,887 ) 42,243,942 34,119,240 (2,298,775 ) (1,311,674 ) — — (31,283,154 ) Cost of sales 472,489,346 970,522,186 51,298,858 3,380,826 646,671,417 49,979,372 (1,071,408,581 ) 1,122,933,424 Gross income (loss) 166,743,573 (1,134,722 ) 76,088,681 (3,483,461 ) 11,733,122 61,348,007 (63,540,593 ) 247,754,607 Other revenue 6,796,590 3,110,226 202,800 22,575 444,289 4,363,967 — 14,940,447 Other expenses (6,134,114 ) (551,926 ) (311,878 ) (7,147 ) — (130,791 ) (75,835 ) (7,211,691 ) Distribution, transportation and sales expenses 262,642 24,007,852 22,467 288,347 1,323,007 31,323 (4,049,727 ) 21,885,911 Administrative expenses 59,171,975 50,652,341 8,504,381 615,830 2,575,536 68,791,707 (59,542,948 ) 130,768,822 Operating income (loss) 107,971,432 (73,236,615 ) 67,452,755 (4,372,210 ) 8,278,868 (3,241,847 ) (23,753 ) 102,828,630 Financing income (3) 87,737,456 1,938,163 697,130 65,049 801,046 156,297,750 (218,300,991 ) 29,235,603 Financing cost (134,241,910 ) (6,346,480 ) (434,392 ) (770,869 ) (971,573 ) (208,419,002 ) 218,322,886 (132,861,340 ) Derivative financial instruments (cost) income, net (3) (7,014,529 ) (9,231 ) — — (1,471,566 ) (14,768,593 ) (4 ) (23,263,923 ) Foreign exchange (loss) income, net 78,315,007 3,674,481 214,157 48,226 (212,619 ) 4,891,136 — 86,930,388 Profit (loss) sharing in joint ventures and associates 28,770 105,447 (17,682 ) (2,314,587 ) 1,195,058 (295,764,002 ) 295,609,103 (1,157,893 ) Taxes, duties and other 373,640,107 (1,446,202 ) (19,902,667 ) — 2,433,349 (10,901,098 ) — 343,823,489 Net (loss) income (240,843,881 ) (72,428,033 ) 87,814,635 (7,344,391 ) 5,185,865 (350,103,460 ) 295,607,241 (282,112,024 ) Total current assets (3) 987,717,368 220,885,024 111,906,985 7,783,507 161,329,297 718,398,444 (1,864,985,584 ) 343,035,041 Total non-current (3) 833,264,268 385,174,767 160,050,916 1,710,361 43,098,566 1,001,349,312 (783,436,151 ) 1,641,212,039 Total current liabilities 393,129,182 290,128,797 28,995,291 12,648,563 125,341,872 1,564,317,345 (1,862,357,422 ) 552,203,628 Total non-current 2,210,050,053 682,521,743 78,111,581 6,121,684 3,382,236 2,080,349,970 (1,697,084,513 ) 3,363,452,754 Equity (deficit), net (3) (782,197,599 ) (366,590,749 ) 164,851,029 (9,276,379 ) 75,703,755 (1,924,919,559 ) 911,020,200 (1,931,409,302 ) Depreciation and amortization 103,328,661 25,260,746 6,521,380 (323,902 ) 93,193 2,306,932 — 137,187,010 Depreciation of rights of use 352,286 4,858,427 228,929 35,515 1,288,306 665,812 — 7,429,275 Net periodic cost of employee benefits excluding items recognized in other comprehensive income 34,534,805 54,347,829 243,330 (6,361 ) 37,512 27,019,834 — 116,176,949 (1) On July 1, 2019 Pemex Drilling and Services was merged into Pemex Exploration and Production. For comparison purposes all operations for periods prior to the merger are presented in the Pemex Exploration and Production segment. (2) On July 1, 2019 Pemex Ethylene was merged into Pemex Industrial Transformation. For comparison purposes all operations for periods prior to the merger are presented in the Pemex Industrial Transformation segment. (3) See Note 4. For the year ended December 31, 2018 Exploration and Production (1) Industrial Logistics Fertilizers Trading Corporate and Other Operating Subsidiary Intersegment eliminations Total Sales: Trade 482,262,631 973,367,343 — 2,933,424 204,103,954 9,778,796 — 1,672,446,148 Intersegment 400,613,623 143,632,442 63,672,574 65,802 640,382,216 119,762,378 (1,368,129,035 ) — Services income 221,885 559,515 4,708,217 4,742 64,038 3,114,605 — 8,673,002 Reversal (impairment) of wells, pipelines, properties, plant and equipment, net 65,013,616 659,610 (40,288,338 ) (2,246,264 ) (1,719,627 ) — — 21,418,997 Cost of sales 401,629,016 1,107,749,282 42,694,683 4,509,881 837,820,025 54,148,722 (1,249,040,048 ) 1,199,511,561 Gross income (loss) 546,482,739 10,469,628 (14,602,230 ) (3,752,177 ) 5,010,556 78,507,057 (119,088,987 ) 503,026,586 Other income 23,734,616 6,784,333 178,431 81,808 1,703,304 7,683,041 1,352,098 41,517,631 Other expenses (15,057,062 ) (1,263,087 ) (40,248,271 ) (10,389 ) 87,697 (911,091 ) 38,937,083 (18,465,120 ) Distribution, transportation and sales expenses 106,573 26,867,986 82,755 387,397 280,407 94,457 (3,462,366 ) 24,357,209 Administrative expenses 68,953,644 53,474,193 11,592,604 785,883 1,541,092 74,525,804 (76,551,739 ) 134,321,481 Operating income (loss) 486,100,076 (64,351,305 ) (66,347,429 ) (4,854,038 ) 4,980,058 10,658,746 1,214,299 367,400,407 Financing income 94,359,725 7,502,075 1,351,514 4,916 702,471 142,481,311 (214,844,890 ) 31,557,122 Financing cost (4) (131,257,815 ) (1,990,001 ) (220,721 ) (478,044 ) (1,379,583 ) (202,865,030 ) 214,321,510 (123,869,684 ) Derivative financial instruments (cost) income, net (4) (15,989,398 ) (11,304 ) — — 382,568 (3,497,812 ) (5 ) (19,115,951 ) Foreign exchange income (loss), net 28,066,138 (1,736,100 ) 167,982 (2,577 ) 920,488 (3,756,451 ) — 23,659,480 Profit (loss) sharing in joint ventures and associates 54,149 — (1,092 ) — 1,012,490 (124,094,148 ) 124,555,613 1,527,012 Taxes, duties and other 469,262,312 1,446,202 (2,474,189 ) — 1,840,409 (8,496,511 ) — 461,578,223 Net (loss) income (7,929,437 ) (62,032,837 ) (62,575,557 ) (5,329,743 ) 4,778,083 (172,576,873 ) 125,246,527 (180,419,837 ) Depreciation and amortization 126,154,366 20,569,085 4,409,226 (246,697 ) 403,122 2,092,938 — 153,382,040 Net periodic cost of employee benefits excluding items recognized in other comprehensive income 33,715,993 51,247,894 191,132 9,162 (321,683 ) 26,861,666 2,917,450 114,621,614 (1) On July 1, 2019 Pemex Drilling and Services was merged into Pemex Exploration and Production. For comparison purposes all operations for periods prior to the merger are presented in the Pemex Exploration and Production segment. (2) On July 1, 2019 Pemex Ethylene was merged into Pemex Industrial Transformation. For comparison purposes all operations for periods prior to the merger are presented in the Pemex Industrial Transformation segment. (3) Pemex Cogeneration and Services was liquidated on July 27, 2018. Except for certain expenses incurred in the liquidation, all operations were transferred to Pemex Industrial Transformation. For comparison purposes all operations for periods prior to the merger are presented in the Pemex Industrial Transformation segment. (4) See Note 4.
Supplemental Geographic Information	Supplemental geographic information – For the years ended December 31, 2020 2019 2018 Domestic sales Ps. 503,712,031 Ps. 807,020,214 Ps. 980,559,538 Export sales: United States 304,344,028 372,134,617 434,838,159 Canada, Central and South America 2,105,703 3,102,066 11,274,714 Europe 45,254,008 131,498,445 158,900,339 Other 93,530,590 79,107,163 86,873,398 Total export sales 445,234,329 585,842,291 691,886,610 Services income* 4,715,484 9,108,680 8,673,002 Total sales Ps. 953,661,844 Ps. 1,401,971,185 Ps. 1,681,119,150 * Services income as of December 31, 2020, 2019 and 2018 represent approximately 97%, 80% and 63%, from domestic
Schedule of Income By Product	Income by product – For the years ended December 31, 2020 2019 2018 Domestic sales Refined petroleum products and derivatives (primarily gasolines) Ps. 409,240,569 Ps. 725,759,040 Ps. 850,342,124 Gas 79,176,837 66,303,063 110,219,691 Petrochemical products 15,294,625 14,958,111 19,997,723 Total domestic sales Ps. 503,712,031 Ps. 807,020,214 Ps. 980,559,538 Export sales Crude oil Ps. 301,199,114 Ps. 408,771,392 Ps. 482,259,045 Refined petroleum products and derivatives (primarily gasolines) 107,391,773 118,495,443 167,796,526 Gas 32,192,334 53,353,075 34,446,277 Petrochemical products 4,451,108 5,222,381 7,384,762 Total export sales Ps. 445,234,329 Ps. 585,842,291 Ps. 691,886,610

Revenue (Tables)

Revenue (Tables)	12 Months Ended
	Dec. 31, 2020
Text block [abstract]
Schedule of Revenue Disaggregation	As of December 31, 2020, 2019 and 2018, the revenues were as follows: A. Revenue disaggregation For the year ended December 31, Exploration (1) Industrial (2)(3) Logistics Fertilizers (4) Trading Corporate and Other Total Geographical market 2020 United States 171,640,991 — — — 131,653,920 1,049,117 304,344,028 Other 85,271,096 — — — 8,259,494 2,124,601 95,655,191 Europe 44,287,027 — — — 966,982 — 45,254,009 Local 327,652 477,920,252 4,099,000 1,516,383 19,135,480 5,409,849 508,408,616 Total 301,526,766 477,920,252 4,099,000 1,516,383 160,015,876 8,583,567 953,661,844 2019 United States 226,689,583 — — — 144,578,641 866,393 372,134,617 Other 57,106,954 — — — 21,001,222 4,101,054 82,209,230 Europe 124,974,855 — — — 6,409,388 1,903,942 133,288,185 Local 761,770 799,255,886 4,663,770 1,635,153 3,587,920 4,434,654 814,339,153 Total 409,533,162 799,255,886 4,663,770 1,635,153 175,577,171 11,306,043 1,401,971,185 2018 United States 276,785,650 — — — 158,713,210 — 435,498,860 Other 51,708,232 — — — 40,743,480 5,660,310 98,112,022 Europe 153,765,163 — — — 4,647,265 2,905,858 161,318,286 Local 225,471 973,926,858 4,708,217 2,938,166 64,037 4,327,233 986,189,982 Total 482,484,516 973,926,858 4,708,217 2,938,166 204,167,992 12,893,401 1,681,119,150 Major products and services 2020 Crude oil 301,199,114 — — — — — 301,199,114 Gas 194,337 60,076,159 — — 51,098,675 — 111,369,171 Refined petroleum products — 409,240,569 — — 107,391,773 — 516,632,342 Other — 8,412,776 — 1,515,464 1,296,288 8,521,205 19,745,733 Services 133,315 190,748 4,099,000 919 229,140 62,362 4,715,484 Total 301,526,766 477,920,252 4,099,000 1,516,383 160,015,876 8,583,567 953,661,844 2019 Crude oil 408,771,392 — — — — — 408,771,392 Gas 288,446 66,014,617 — — 53,353,075 — 119,656,138 Refined petroleum products — 722,239,101 — — 121,028,417 986,965 844,254,483 Other — 8,913,397 — 1,634,300 1,127,697 8,505,098 20,180,492 Services 473,324 2,088,771 4,663,770 853 67,982 1,813,980 9,108,680 Total 409,533,162 799,255,886 4,663,770 1,635,153 175,577,171 11,306,043 1,401,971,185 2018 Crude oil 482,259,045 — — — — — 482,259,045 Gas 3,586 110,216,105 — — 34,446,277 — 144,665,968 Refined petroleum products — 850,342,124 — — 167,796,526 — 1,018,138,650 Other — 12,809,114 — 2,933,424 1,861,151 9,778,796 27,382,485 Services 221,885 559,515 4,708,217 4,742 64,038 3,114,605 8,673,002 Total 482,484,516 973,926,858 4,708,217 2,938,166 204,167,992 12,893,401 1,681,119,150 Timing of revenue recognition 2020 Products transferred at a point in time 301,526,766 477,729,504 4,099,000 1,515,464 159,786,736 8,521,205 953,178,675 Products and services transferred over the time — 190,748 — 919 229,140 62,362 483,169 Total 301,526,766 477,920,252 4,099,000 1,516,383 160,015,876 8,583,567 953,661,844 2019 Products transferred at a point in time 409,059,838 797,167,115 4,663,770 1,634,300 175,509,189 9,492,063 1,397,526,275 Products and services transferred over the time 473,324 2,088,771 — 853 67,982 1,813,980 4,444,910 Total 409,533,162 799,255,886 4,663,770 1,635,153 175,577,171 11,306,043 1,401,971,185 2018 Products transferred at a point in time 482,262,631 973,367,343 4,708,217 2,933,424 204,103,954 9,778,796 1,677,154,365 Products and services transferred over the time 221,885 559,515 — 4,742 64,038 3,114,605 3,964,785 Total 482,484,516 973,926,858 4,708,217 2,938,166 204,167,992 12,893,401 1,681,119,150 (1) On July 1, 2019 Pemex Drilling and Services was merged into Pemex Exploration and Production. For comparison purposes all operations for periods prior to the merger are presented in the Pemex Exploration and Production segment. (2) On July 1, 2019 Pemex Ethylene was merged into Pemex Industrial Transformation. For comparison purposes all operations for periods prior to the merger are presented in the Pemex Industrial Transformation segment. (3) Pemex Cogeneration and Services was liquidated on July 27, 2018. Except for certain expenses incurred in the liquidation, all operations were transferred to Pemex Industrial Transformation. For comparison purposes all operations for periods prior to the merger are presented in the Pemex Industrial Transformation segment. (4) Merged as of January 1, 2021, see Note 28-E.

Financial Instruments (Tables)

Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Text block [abstract]
Summary of Carrying Amounts and Fair Value of Financial Assets and Liabilities	The following tables present information about PEMEX’s carrying amounts and fair values of financial assets and financial liabilities, including their levels in the fair value hierarchy, as of December 31, 2020 and 2019. It does not include fair value information for financial assets and financial liabilities not measured at fair value if the carrying amount is a reasonable approximation of fair value. Additionally, as of December 31, 2020 and 2019, the disclosure of the fair value of lease liabilities is also not required. Carrying amount Fair value hierarchy As of December 31, 2020 FVTPL FVOCI – FVOCI – Financial cost Other financial Total Level 1 Level 2 Level 3 Total Financial assets measured at fair valu e Derivative financial instruments 25,947,993 — — — — 25,947,993 — 25,947,993 — 25,947,993 Equity instruments(i) — — 384,665 — — 384,665 — 384,665 — 384,665 Total 25,947,993 — 384,665 — — 26,332,658 Financial assets not measured at fair value Cash and cash equivalents — — — 39,989,781 — 39,989,781 — — — — Customers — — — 68,382,413 — 68,382,413 — — — — Other non-financing — — — 1,944,413 — 1,944,413 — — — — Officials and employees — — — 3,539,505 — 3,539,505 — — — — Sundry debtors — — — 28,076,118 — 28,076,118 — — — — Investments in joint ventures and associates — — — 12,015,129 — 12,015,129 — — — — Notes receivable — — — 886,827 — 886,827 — — — — Government Bonds — — — 129,549,519 — 129,549,519 129,320,536 — — 129,320,536 Other assets — — — 3,824,923 — 3,824,923 — — — — Total — — — 288,208,618 — 288,208,618 Financial liabilities measured at fair value Derivative financial instruments (9,318,015 ) — — — — (9,318,015 ) — (9,318,015 ) — (9,318,015 ) Total (9,318,015 ) — — — — (9,318,015 ) Financial liabilities not measured at fair value Suppliers — — — — (281,978,041 ) (281,978,041 ) — — — — Accounts and accrued expenses payable — — — — (30,709,497 ) (30,709,497 ) — — — — Leases — — — — (63,184,128 ) (63,184,128 ) — — — — Debt — — — — (2,258,727,317 ) (2,258,727,317 ) — (2,232,694,117 ) — (2,232,694,117 ) Total — — — — (2,634,598,983 ) (2,634,598,983 ) (i) Refers to the participation in TAG Pipelines Sur, S. de R.L. de C.V. Carrying amount Fair value hierarchy As of December 31, 2019 FVTPL FVOCI – FVOCI – Financial Other Total Level 1 Level 2 Level 3 Total Financial assets measured at fair value Derivative financial instruments 11,496,330 — — — — 11,496,330 — 11,496,330 — 11,496,330 Equity instruments (i) — — 346,563 — — 346,563 — 346,563 — 346,563 Total 11,496,330 — 346,563 — — 11,842,893 Financial assets not measured at fair value Cash and cash equivalents — — — 60,621,631 — 60,621,631 — — — — Customers — — — 89,263,870 — 89,263,870 — — — — Officials and employees — — — 3,667,242 — 3,667,242 — — — — Sundry debtors — — — 27,748,849 — 27,748,849 — — — — Investments in joint ventures and associates — — — 14,874,579 — 14,874,579 — — — — Notes receivable — — — 127,475,276 — 127,475,276 — — — — Other assets — — — 3,451,096 — 3,451,096 — — — — Total — — — 327,102,543 — 327,102,543 Financial liabilities measured at fair value Derivative financial instruments (16,650,171 ) — — — — (16,650,171 ) — (16,650,171 ) — (16,650,171 ) Total (16,650,171 ) — — — — (16,650,171 ) Financial liabilities not measured at fair value Suppliers — — — — (208,034,407 ) (208,034,407 ) — — — — Accounts and accrued expenses payable — — — — (26,055,151 ) (26,055,151 ) — — — — Leases — — — — (68,148,627 ) (68,148,627 ) — — — — Debt — — — — (1,983,174,088 ) (1,983,174,088 ) — (2,035,079,540 ) — (2,035,079,540 ) Total — — — — (2,285,412,273 ) (2,285,412,273 ) (i) Refers to the participation in TAG Pipelines Sur, S. de R.L. de C.V.
Summary of Monetary Assets and Liabilities Denominated In Foreign Currency		As of December 31, 2020 and 2019, PEMEX has monetary assets and liabilities denominated in foreign currency as indicated below: As of December 31, 2020 Foreign currency Assets Liabilities Net position Exchange Equivalent to U.S. dollar 7,293,404 87,866,609 (80,573,205 ) 19.9487 Ps. (1,607,330,695 ) Euro 2,564 13,501,943 (13,499,379 ) 24.4052 (329,455,044 ) Pounds sterling 30 819,590 (819,560 ) 27.2579 (22,339,485 ) Japanese yen — 110,165,166 (110,165,166 ) 0.1933 (21,294,927 ) Swiss francs — 515,348 (515,348 ) 22.5720 (11,632,435 ) Total Ps. (1,992,052,586 ) As of December 31, 2019 Foreign currency Assets Liabilities Net position /(Liability) Exchange Equivalent to U.S. dollar 11,817,320 76,053,967 (64,236,647 ) 18.8452 Ps. (1,210,552,460 ) Euro 1,974 27,932,908 (27,930,934 ) 21.1537 (590,842,599 ) Pounds sterling 29 1,575,918 (1,575,889 ) 24.9586 (39,331,983 ) Japanese yen — 221,975,145 (221,975,145 ) 0.1734 (38,490,490 ) Swiss francs — 1,666,864 (1,666,864 ) 19.4596 (32,436,507 ) Total Ps. (1,911,654,039 )

Cash and Cash Equivalents (Tabl

Cash and Cash Equivalents (Tables)	12 Months Ended
	Dec. 31, 2020
Text block [abstract]
Summary of Cash and Cash Equivalents	As of December 31, 2020 and 2019, cash and cash equivalents were as follows: 2020 2019 Cash on hand and in banks (i) Ps. 20,211,875 Ps. 27,502,675 Highly liquid investments (ii) 19,777,906 33,118,956 Ps. 39,989,781 Ps. 60,621,631 (i) Cash on hand and in banks is primarily composed of cash in banks. (ii) Mainly composed of short-term Mexican Government investments.

Customers and Other Financing_2

Customers and Other Financing and Non-Financing Accounts Receivable (Tables)	12 Months Ended
	Dec. 31, 2020
Text block [abstract]
Summary of Accounts Receivable and Other Receivables	As of December 31, 2020 and 2019, accounts receivable and other receivables were as follows: A. Customers 2020 2019 Domestic customers, net Ps. 35,049,717 Ps. 46,792,824 Export customers, net 33,332,696 42,471,046 Total customers Ps. 68,382,413 Ps. 89,263,870
Schedule of Breakdown of Accounts Receivable Based on Credit History	The following table shows a breakdown of accounts receivable based on their credit history at December 31, 2020 and 2019, as well as the relation between the breakdown and the impaired amount: Domestic customers 2020 2019 Current Ps. 34,034,116 Ps. 44,898,986 1 to 30 days 535,938 801,299 31 to 60 days 110,911 302,817 61 to 90 days 19,614 604,025 More than 90 days 1,531,867 1,285,883 Total 36,232,446 47,893,010 Impaired (reserved) (1,182,729 ) (1,100,186 ) Total Ps. 35,049,717 Ps. 46,792,824 Export customers 2020 2019 Current Ps. 30,346,622 Ps. 36,037,725 1 to 30 days 2,925,807 5,895,862 31 to 60 days 73,026 11,120 61 to 90 days 8,063 31,182 More than 90 days 190,541 677,980 Total 33,544,059 42,653,869 Impaired (reserved) (211,363 ) (182,823 ) Total Ps. 33,332,696 Ps. 42,471,046
Summary of Reconciliation for Impaired Accounts Receivable	Additionally, the reconciliation for impaired accounts receivable is as follows: Domestic customers 2020 2019 Balance at the beginning of the year Ps. (1,100,186 ) Ps. (1,409,014 ) Impairment accounts receivable (82,543 ) 308,828 Balance at the end of the year Ps. (1,182,729 ) Ps. (1,100,186 ) Export customers 2020 2019 Balance at the beginning of the year Ps. (182,823 ) Ps. (321,438 ) Impairment accounts receivable (20,353 ) 111,674 Translation effects (8,187 ) 26,941 Balance at the end of the year Ps. (211,363 ) Ps. (182,823 )
Summary of Other Accounts Receivable	B. Other financial and non-financial 2020 2019 Financial assets: Sundry debtors (1) Ps. 28,076,118 Ps. 27,748,849 Employees and officers 3,539,505 3,667,242 Total financial assets Ps. 31,615,623 Ps. 31,416,091 Non-financial assets: Taxes to be recovered and prepaid taxes Ps. 55,187,272 Ps. 26,162,225 Special Tax on Production and Services 32,657,743 31,587,018 Advances to suppliers — 565,817 Other accounts receivable 1,944,413 1,510,660 Total non-financial Ps. 89,789,428 Ps. 59,825,720 (1) Includes Ps. (197,215) and Ps. (37,139) of impairment, as of December 31, 2020 and 2019, respectively.

Inventories (Tables)

Inventories (Tables)	12 Months Ended
	Dec. 31, 2020
Text block [abstract]
Summary of Inventories	As of December 31, 2020 and 2019, inventories were as follows: 2020 2019 Refined and petrochemicals products Ps. 32,175,910 Ps. 41,211,837 Crude oil 11,997,570 14,087,218 Materials and products in stock 4,736,659 4,381,628 Products in transit 3,476,807 22,719,635 Gas and condensate products 142,136 144,284 Materials in transit 76,579 127,594 Ps. 52,605,661 Ps. 82,672,196

Investments in Joint Ventures_2

Investments in Joint Ventures and Associates (Tables)	12 Months Ended
	Dec. 31, 2020
Investments Schedule [Abstract]
Schedule of Permanent Investments in joint Ventures and Associates	The investments in joint ventures and associates as of December 31, 2020 and 2019, were as follows: Percentage of investment December 31, 2020 2019 Deer Park Refining Limited 49. 99 % Ps. 9,635,176 Ps. 12,652,599 Sierrita Gas Pipeline LLC 35. 00 % 1,232,464 1,171,593 Frontera Brownsville, LLC. 50. 00 % 479,520 446,202 Texas Frontera, LLC. 50. 00 % 197,708 199,923 CH 4 Energía, S. A. de C.V. 50. 00 % 141,339 192,614 Administración Portuaria Integral de Dos Bocas, S. A. de C.V. 40. 00 % 208,152 165,370 Other-net Various 120,770 46,278 Ps. 12,015,129 Ps. 14,874,579
Schedule (Loss) profit Sharing in Joint Ventures and Associates	Profit (loss) sharing in joint ventures and associates: December 31, 2020 2019 2018 Deer Park Refining Limited Ps. (4,056,037 ) Ps. (1,438,308 ) Ps. 872,885 Sierrita Gas Pipeline LLC 182,805 118,959 124,209 Frontera Brownsville, LLC. 55,738 47,719 59,973 Administración Portuaria Integral de Dos Bocas, S.A. de C.V. 42,782 46,893 54,149 Texas Frontera, LLC. 34,486 47,585 55,316 CH4 Energía S.A. de C.V. 21,224 36,864 15,395 Ductos el Peninsular, S. A. P. I. de C. V. (1,097 ) (17,605 ) (1,092 ) PMV Minera, S.A. de C.V. (i) — — 6,863 Petroquímica Mexicana de Vinilo, S. A. de C. V. (i) — — 352,816 Other, net 179,566 — (13,502 ) (Loss) profit sharing in joint ventures and associates, net Ps. (3,540,533 ) Ps. (1,157,893 ) Ps. 1,527,012 (i) On November 30, 2018, PEMEX received the payment for the sale of its total 44.09% interest in Petroquímica Mexicana de Vinilo, S.A. de C.V. and 44.09% interest in PMV Minera, S.A. de C.V. which were recorded as investments in joint ventures and associates. The sale price was Ps. 3,198,597 and Ps. 53,701, respectively, for a gain of Ps. 689,268 and Ps. 1,646, respectively.
Schedule of Condensed Financial Information of Major Investments Recognized Under the Equity Method	The following tables show condensed financial information of major investments recognized under the equity method as of December 31, 2020 and 2019 and for the years ended December 31, 2020, 2019 and 2018: i. Joint venture Condensed statements of financial position Deer Park Refining Limited December 31, 2020 2019 Cash and cash equivalents Ps. 29,504 Ps. 24,536 Other current assets 294,742 1,476,541 Current assets 324,246 1,501,077 Non-current 43,348,665 42,458,405 Total assets 43,672,911 43,959,482 Current financial liabilities 11,617,624 8,008,343 Other current liabilities 523,354 410,524 Current liabilities 12,140,978 8,418,867 Non-current 11,158,305 8,373,280 Other liabilities 1,101,348 1,859,607 Non-current 12,259,653 10,232,887 Total liabilities 24,400,631 18,651,754 Total equity 19,272,280 25,307,728 Total liabilities and equity Ps. 43,672,911 Ps. 43,959,482 Condensed statements of comprehensive income Deer Park Refining Limited December 31, 2020 (1) 2019 (2) 2018 Sales and other income Ps. 8,114,474 Ps. 13,560,847 Ps. 17,519,219 Costs and expenses 10,770,248 11,775,836 11,159,617 Depreciation and amortization 4,776,575 4,088,972 4,094,308 Interest paid 674,504 565,392 503,978 Income tax 6,028 7,551 15,371 Net result Ps. (8,112,881 ) Ps. (2,876,904 ) Ps. 1,745,945 (1) The net loss in 2020, was the result of the economic slowdown and the decline in consumption of refined products caused by Covid-19. (2) 2019 net loss was due to the major maintenance of the Refinery that produced a decrease in the processing of crude oil in refined products. ii. Associates Condensed statements of financial position Sierrita Gas Pipeline, LLC December 31, 2020 2019 Current assets Ps. 186,919 Ps. 331,694 Non-current 3,417,052 3,222,956 Total assets 3,603,971 3,554,650 Current liabilities 82,648 207,241 Total liabilities 82,648 207,241 Total equity 3,521,324 3,347,409 Total liabilities and equity Ps. 3,603,971 Ps. 3,554,650 Condensed statements of comprehensive income Sierrita Gas Pipeline, LLC December 31, 2020 2019 2018 Sales and other income Ps. 942,024 Ps. 669,579 Ps. 615,150 Costs and expenses 419,729 329,695 260,272 Net result Ps. 522,295 Ps. 339,884 Ps. 354,878

Wells, Pipelines, Properties,_2

Wells, Pipelines, Properties, Plant and Equipment, Net (Tables)	12 Months Ended
	Dec. 31, 2020
Statement [LineItems]
Detailed Information About Property, Plant and Equipment	Plants Drilling Pipelines Wells Buildings Offshore Furniture and Transportation Construction (1) Land Unproductive Other fixed Total fixed Investment Balances as of January 1, 2019 Ps.811,270,391 20,080,965 421,235,950 1,379,323,723 64,845,163 326,482,265 52,020,042 15,159,952 129,352,513 44,351,625 — 32,659 3,264,155,248 Transfers to rights of use — (7,005,141 ) — — — — — — — — — — (7,005,141 ) Acquisitions 8,337,019 252,382 1,251,488 29,072,723 316,499 5,436,425 184,863 1,735,581 82,520,111 182,563 — — 129,289,654 Reclassifications (1,381,310 ) — 428,738 — (51,885 ) (614,430 ) (234,643 ) 47,110 (106,429 ) (16,161 ) 35,403 — (1,893,607 ) Unsuccessful wells — — — (69,231,587 ) — — — — (7,922,365 ) — — — (77,153,952 ) Capitalization 6,830,064 — 6,538,540 35,251,706 143,312 13,013,199 2,566 955,134 (62,722,409 ) (12,112 ) — — — (Impairment) (21,207,717 ) — (53,718,547 ) (101,683,066 ) (500,745 ) (43,001,652 ) — (2,076,680 ) (2,249,951 ) — — — (224,438,358 ) Reversal of impairment 48,389,246 — 85,500,267 31,086,852 1,023 25,167,135 — 646,603 2,364,078 — — — 193,155,204 Disposals (3,396,366 ) (235,382 ) (301,359 ) (151,405 ) (1,435,140 ) — (1,565,266 ) (112,482 ) (1,310,108 ) (356,379 ) (35,403 ) (32,659 ) (8,931,949 ) Balances as of December 31, 2019 Ps.848,841,327 13,092,824 460,935,077 1,303,668,946 63,318,227 326,482,942 50,407,562 16,355,218 139,925,440 44,149,536 — — 3,267,177,099 Acquisitions 13,934,129 246,351 1,911,502 15,602,539 1,118,794 3,696,726 294,329 552,865 131,963,334 543,472 — — 169,864,041 Reclassifications (1,446,201 ) — 228,056 — 361,131 — 410,240 7,586 (1,234,963 ) 115,107 24,601 — (1,534,443 ) Capitalization 9,906,725 — 19,022,425 42,183,243 616,006 15,695,486 8,835 1,532 (87,150,784 ) (283,468 ) — — — (Impairment) (66,031,126 ) — (9,392,862 ) (48,028,474 ) (65,964 ) (16,210,995 ) — — (20,210,911 ) — — — (159,940,332 ) Reversal of impairment 9,797,281 153,456 11,943,047 73,801,995 1,563,299 25,872,979 8,159 426,560 19,856 — — — 123,586,632 Disposals (3,297,113 ) — (2,855,580 ) — (6,599,754 ) (1,184,109 ) (2,300,115 ) (514,229 ) (1,441,548 ) (298,828 ) (24,601 ) — (18,515,877 ) Balances as of December 31, 2020 Ps.811,705,022 13,492,631 481,791,665 1,387,228,249 60,311,739 354,353,029 48,829,010 16,829,532 161,870,424 44,225,819 — — 3,380,637,120 Accumulated depreciation and amortization Balances as of January 1, 2019 (436,603,123 ) (5,998,481 ) (173,264,040 ) (973,467,746 ) (42,924,256 ) (179,831,090 ) (42,161,378 ) (7,419,050 ) — — — — (1,861,669,164 ) Transfers to rights of use — 943,639 — — — — — — — — — — 943,639 Depreciation and amortization (49,473,592 ) (591,168 ) (16,380,653 ) (51,574,532 ) (2,131,913 ) (13,820,275 ) (2,556,539 ) (658,338 ) — — — — (137,187,010 ) Reclassifications 1,303,186 — 41,225 — 205,661 116,278 220,301 6,956 — — — — 1,893,607 Disposals 3,308,366 128,561 184,172 817 1,226,345 — 1,449,659 92,471 — — — — 6,390,391 Balances as of December 31, 2019 Ps.(481,465,163 ) (5,517,449 ) (189,419,296 ) (1,025,041,461 ) (43,624,163 ) (193,535,087 ) (43,047,957 ) (7,977,961 ) — — — — (1,989,628,537 ) Depreciation and amortization (42,071,837 ) (384,993 ) (14,042,861 ) (56,325,342 ) (1,989,834 ) (11,671,929 ) (2,249,987 ) (895,037 ) — — — — (129,631,820 ) Reclassifications 1,782,525 — (90,590 ) — (103,562 ) — (203,053 ) 149,123 — — — — 1,534,443 Disposals 1,172,277 — 2,576,418 — 5,824,019 968,552 2,164,127 512,922 — — — — 13,218,315 Balances as of December 31, 2020 Ps.(520,582,198 ) (5,902,442 ) (200,976,329 ) (1,081,366,803 ) (39,893,540 ) (204,238,464 ) (43,336,870 ) (8,210,953 ) — — — — (2,104,507,599 ) Wells, pipelines, proper0ties, plant and Ps.367,376,164 7,575,375 271,515,781 278,627,485 19,694,064 132,947,855 7,359,605 8,377,257 139,925,440 44,149,536 — — 1,277,548,562 Wells, pipelines, properties, plant and Ps.291,122,824 7,590,189 280,815,336 305,861,446 20,418,199 150,114,565 5,492,140 8,618,579 161,870,424 44,225,819 — — 1,276,129,521 Depreciation rates 3 to 5 % 5 % 2 to 7 % — 3 to 7 % 4 % 3 to 10 % 4 to 20 % — — — — — Estimated useful lives 20 to 35 20 15 to 45 — 33 to 35 25 3 to 10 5 to 25 — — — — — (1) Mainly wells, pipelines and plants. During 2020, PEMEX detected errors in certain costs and expenses used for the determination of the value in use of certain cash-generating units in the exploration and production segment as of December 31, 2019. This resulted in a different value in use in some cash-generating units and thus, an increase in the value of wells, pipelines, plants and platforms 1 4-B). A. As of December 31, 2020, 2019 and 2018, the financing cost identified with fixed assets in the construction or installation stage, capitalized as part of the value of such fixed assets, was Ps. 3,893,248, Ps. 2,959,025 and Ps. 2,198,191, respectively. Financing cost rates during 2020, 2019 and 2018 were 5.75% to 7.08%, 5.27% to 6.84% and 4.94% to 6.07%, respectively. B. The combined depreciation of fixed assets and amortization of wells for the fiscal years ended December 31, 2020, 2019 and 2018, recognized in operating costs and expenses, was Ps. 129,631,820, Ps. 137,187,010 and Ps. 153,382,040, respectively. These figures include Ps. 101,339,417, Ps. 103,173,593 and Ps. 124,790,099 for oil and gas production assets and costs related to the plugging and abandonment of wells in the amounts of Ps. 2,731,317, Ps. 4,700,151 and Ps. 983,438, for the years ended December 31, 2020, 2019 and 2018, respectively. C. As of December 31, 2020 and 2019, provisions relating to future plugging of wells costs amounted to Ps. 77,125,513 and Ps. 80,849,900, respectively, and are presented in the “Provisions for plugging of wells” (see Note 20). D. As of December 31, 2020, 2019 and 2018, acquisitions of property, plant and equipment include transfers from wells unassigned to a reserve for Ps. 6,229,356, Ps. 5,986,055 and Ps. 6,726,769 respectively (see Note 14) and Ps. 1,072,537 from available-for-sale non-financial E. As of December 31, 2020, 2019 and 2018, the translation effect of property, plant and equipment items from a different currency than the presentation currency was Ps. 490,203, Ps. (1,776,684) and Ps. (238,422), respectively, which was mainly plant. F. At the end of December 2020, PEMEX had impairment impacts mainly due to the long reduction in crude oil prices and the decrease in demand for products, resulting from the Covid-19
Summary of Recoverable Amount of Assets	The recoverable amounts of the assets as of December 31, 2019 and 2018, corresponding to the discounted cash flows at the rate of 11.97%, 11.94% and 13.55%, respectively, as follows: 2020 2019 2018 TAD, TDGL, TOMS (Storage terminals) Ps. 95,169,597 Ps. 147,249,859 Ps. 92,772,003 Pipelines 88,740,662 105,319,693 — Primary logistics 108,036,325 73,821,371 111,941,265 Land Transport (white pipes) — — 445,377 Total Ps. 291,946,584 Ps. 326,390,923 Ps. 205,158,645
Consolidated and Separate Financial Statements	See below for a condensed statement of comprehensive income and condensed statement of financial position, summarizing the projects listed above: Production-sharing contracts As of /For the year ended December 31, 2020 EK-Balam Block 2 Block 8 Block 16 Block 17 Block 18 Block 29 Block 32 Block 33 Block 35 Santuario El Golpe Misión Ébano Sales: Net sales 11,838,057 — — — — — — — — — 1,559,644 942,514 374,118 Cost of sales 10,893,808 50,159 45,229 18,443 19,522 65,343 17,783 51,238 107,548 274,445 673,887 1,273,269 637,905 Gross income (loss) 944,249 (50,159 ) (45,229 ) (18,443 ) (19,522 ) (65,343 ) (17,783 ) (51,238 ) (107,548 ) (274,445 ) 885,757 (330,755 ) (263,787 ) Other income (loss), net (128,602 ) — — — — — — — — — — — — Administrative expenses 62,964 — — — — — — — — — — — — Operating income (loss) 752,683 (50,159 ) (45,229 ) (18,443 ) (19,522 ) (65,343 ) (17,783 ) (51,238 ) (107,548 ) (274,445 ) 885,757 (330,755 ) (263,787 ) Taxes, duties and other — — — — — — — — — — — — — Net income (loss) 752,683 (50,159 ) (45,229 ) (18,443 ) (19,522 ) (65,343 ) (17,783 ) (51,238 ) (107,548 ) (274,445 ) 885,757 (330,755 ) (263,787 ) Cash and cash equivalents 9 22,852 17,089 — — 5,431 16 13,868 — — 15,213 5 — Accounts receivable 11,838,057 161,079 7,848 17,040 (907 ) — — — (31,348 ) (21,559 ) 1,640,681 1,290,282 374,118 Total current assets 11,838,066 183,931 24,937 17,040 (907 ) 5,431 16 13,868 (31,348 ) (21,559 ) 1,655,894 1,290,287 374,118 Wells, pipelines, properties, plant and equipment, net 39,477,424 — — — — — — — — — 1,344,617 802,194 1,317,055 Total assets 51,315,490 183,931 24,937 17,040 (907 ) 5,431 16 13,868 (31,348 ) (21,559 ) 3,000,511 2,092,481 1,691,173 Suppliers 4,340,715 — — 18,443 19,522 — 670 — 107,548 274,445 930,246 615,457 602,659 Taxes and duties payable 462 999 1,067 — — 1,481 857 1,871 — — — — — Other current liabilities 474,670 233,091 69,099 17,040 (907 ) 69,293 16,272 63,235 (31,348 ) (21,559 ) 96,251 347,774 — Total liabilities 4,815,847 234,090 70,166 35,483 18,615 70,774 17,799 65,106 76,200 252,886 1,026,497 963,231 602,659 Equity (deficit), net 46,499,643 (50,159 ) (45,229 ) (18,443 ) (19,522 ) (65,343 ) (17,783 ) (51,238 ) (107,548 ) (274,445 ) 1,974,014 1,129,250 1,088,514 License contracts As of /For the year ended December 31, 2020 Trion Block 3 Block 2 Block 5 Block 18 Block 22 Cárdenas Ogarrio Miquetla Sales: Net sales — — — — — — 1,005,967 1,184,356 167,504 Cost of sales 9,360 32,908 89,762 100,050 106,755 92,633 606,463 674,421 189,557 Gross income (loss) (9,360 ) (32,908 ) (89,762 ) (100,050 ) (106,755 ) (92,633 ) 399,504 509,935 (22,053 ) Other income (loss), net — — — — — — — — — Administrative expenses — — — — — — — — — Operating income (loss) (9,360 ) (32,908 ) (89,762 ) (100,050 ) (106,755 ) (92,633 ) 399,504 509,935 (22,053 ) Taxes, duties and other — — — — — — — — — Net income (loss) (9,360 ) (32,908 ) (89,762 ) (100,050 ) (106,755 ) (92,633 ) 399,504 509,935 (22,053 ) Cash and cash equivalents — — — 20 20 — 146 512 — Accounts receivable — (32,908 ) (36,216 ) — — (48,872 ) 1,892,736 1,648,777 167,505 Total current assets — (32,908 ) (36,216 ) 20 20 (48,872 ) 1,892,882 1,649,289 167,505 Wells, pipelines, properties, plant and equipment, net — — — — — — 1,774,845 1,345,902 97,546 Total assets — (32,908 ) (36,216 ) 20 20 (48,872 ) 3,667,727 2,995,191 265,051 Suppliers 9,360 — 85,698 670 — 92,633 690,174 980,727 181,605 Taxes and duties payable — — — 4,976 5,312 — — — — Other current liabilities — — (32,152 ) 94,424 101,463 (48,872 ) 886,914 464,933 — Total liabilities 9,360 — 53,546 100,070 106,775 43,761 1,577,088 1,445,660 181,605 Equity (deficit), net (9,360 ) (32,908 ) (89,762 ) (100,050 ) (106,755 ) (92,633 ) 2,090,639 1,549,531 83,446
Pemex industrial transformation [member]
Statement [LineItems]
Summary of Net Impairment and Net Reversal of Impairment	The net reversal of impairment was in the following CGUs: 2020 2019 2018 Minatitlán Refinery Ps. (37,432,703 ) — — Madero Refinery (18,412,687 ) — (733,307 ) Salamanca Refinery (5,386,525 ) — — Tula Refinery (2,820,750 ) — (5,099,635 ) Cadereita Refinery (2,083,755 ) — Morelos Petrochemical Complex (2,048,039 ) — — New Pemex Gas Processor Complex (1,080,831 ) — — Cangrejera Petrochemical Complex (1,484,489 ) — — Ciudad Pemex Gas Processing Complex (709,127 ) — — Morelos Ethylene Processor Complex (302,665 ) — — Pajaritos Petrochemical Complex — (1,275,480 ) — Salina Cruz Refinery — — (7,955,528 ) Impairment (71,761,571 ) (1,275,480 ) (13,788,470 ) Salina Cruz Refinery Ps. — 13,535,526 — Minatitlán Refinery — 9,391,433 14,448,080 Madero Refinery — 7,721,233 — Morelos Petrochemical Complex — 7,547,233 — Cangrejera Petrochemical Complex — 3,143,924 — Tula Refinery — 2,180,073 — Reversal of impairment — 43,519,422 14,448,080 Net (impairment) reversal of impairment Ps. (71,761,571 ) 42,243,942 659,610
Summary of Recoverable Amount of Assets	As of December 31, 2020, 2019 and 2018, the value in use for the impairment of fixed assets was as follows: 2020 2019 2018 Salamanca Refinery Ps. 44,777,784 — — Cadereyta Refinery 40,793,541 — — Salina Cruz Refinery 30,422,588 — 9,428,152 Minatitlán Refinery 18,819,247 61,673,158 54,846,565 Cangrejera Ethylene Processor Complex 11,493,567 Tula Refinery 34,829,922 40,450,717 39,429,897 Madero Refinery 6,799,072 27,840,687 21,083,328 Morelos Complex (Ethylene) 9,396,765 13,731,548 — Pajaritos Complex (Ethylene) — 1,275,480 — Total value in use Ps. 197,332,486 144,971,590 124,787,942
Assumptions to Determine Net Present Value of Reserves Long Lived Assets	To determine the value in use of long-lived assets associated with the CGUs of Pemex Industrial Transformation, the net present value of cash flows was determined based on the following assumptions: As of December 31, 2020 2019 2018 2020 2019 2018 2020 2019 2018 2019 Refining Gas Petrochemicals Ethylene** Average crude oil Price 48.89 usd 54.13 usd 53.98 usd N.A. N.A. N.A. Processed volume 920 mbd 723 mbd 680 mbd 2,134 mmpcd of humid gas 2,056 mmpcd of humid gas 2,717mmpcd of humid gas Variable because the load inputs are diverse Rate of U.S. dollar $19.9487 $18.8452 $19.6829 $19.9487 $18.8452 $19.68 19.9487 $18.8452 $19.6829 $18.8452 Useful lives of the cash-generating units (year average) 12 12 14 7 7 8 7 7 7 6 Discount rate 10.83% 11.47% 11.52% 9.76% 10.22% 10.22% 9.76% 8.61% 8. 92% 8.03% Period* 2020-2032 2020-2032 2019-2034 2020-2027 2020-2027 2019-2027 2020-2027 2020-2027 2019-2026 2020-2026 * The first 5 years are projected and stabilize at year 6. ** This entity was merged into Pemex Industrial Transformation on July 1, 2019.
Pemex Exploration And Production [member]
Statement [LineItems]
Summary of Net Impairment and Net Reversal of Impairment	The net reversal of impairment was in the following CGUs: 2020 2019 2018 Aceite Terciario del Golfo Ps. 29,954,188 — 29,592,864 Cantarell 23,218,889 — 98,673,388 Burgos 9,084,982 7,929,552 — Tsimin Xux 3,920,244 — 627,426 Cuenca de Macuspana 735,919 — — Crudo Ligero Marino — 949,645 — Yaxche — 20,608,627 — Antonio J. Bermúdez — — 6,811,344 Tamaulipas Constituciones — — 140,125 Reversal of impairment 66,914,222 29,487,824 135,845,147 Chuc (11,321,001 ) (25,431,950 ) (6,608,047 ) Antonio J. Bermúdez (9,705,730 ) (3,562,021 ) — Ayín Alux (3,269,173 ) (2,220,696 ) — Tamaulipas Constituciones (2,819,337 ) — — Crudo Ligero Marino (2,213,428 ) — (31,004,065 ) Lakach (1,269,083 ) (56,119 ) (841,718 ) Arenque (803,256 ) — — Ixtal – Manik (481,673 ) (5,047,793 ) — Aceite Terciario del Golfo — (46,284,407 ) — Cantarell — (48,664,886 ) — Tsimin Xux — (1,062,635 ) — Cuenca de Macuspana — (166,013 ) (1,343,836 ) Poza Rica — (1,027,191 ) — Yaxche — — (20,491,627 ) Burgos — — (10,542,238 ) (Impairment) (31,882,681 ) (133,523,711 ) (70,831,531 ) Reversal of impairment (Impairment), net Ps. 35,031,541 (104,035,887 ) 65,013,616
Assumptions to Determine Net Present Value of Reserves Long Lived Assets	To determine the value in use of long-lived assets associated to hydrocarbon extraction, the net present value of reserves is determined based on the following assumptions: 2020 2019 2018 Average crude oil price 52.96 USD/bl 48.69 USD/bl 58.02 USD/bl Average gas price 5.21 USD/mpc 5.07 USD/mpc 4.89 USD/mpc Average condensates price 61.09 USD/bl 57.67 USD/bl 43.21 USD/bl Discount rate 6.23% annual 6.18% annual 7.03% annual
Summary of reversal impairment loss for CGUs	As of December 31, 2020, 2019 and 2018, values in use for CGU with impairment or reversal of impairment are: 2020 2019 2018 Cantarell Ps. 125,953,979 101,446,620 157,526,000 Chuc 63,880,611 72,301,156 97,970,000 Aceite Terciario del Golfo 39,947,448 12,667,016 80,713,000 Tsimin Xux 25,910,556 28,116,300 38,152,000 Crudo Ligero Marino 24,233,795 18,935,146 23,540,000 Antonio J. Bermúdez 24,027,588 39,195,252 — Burgos 17,487,412 10,731,645 2,124,000 Ixtal – Manik 12,647,284 19,024,166 — Ayín Alux 6,213,753 2,705,441 — Tamaulipas Constituciones 5,416,487 — — Arenque 4,908,009 — — Cuenca de Macuspana 1,096,972 432,365 680,000 Lakach (169,119 ) (2,426,036 ) (1,658,000 ) Yaxche — 93,677,507 516,000 Poza Rica — 15,029,941 — Total Ps. 351,554,775 411,836,519 399,563,000
Pemex Logistics [member]
Statement [LineItems]
Summary of Net Impairment and Net Reversal of Impairment	The net reversal of impairment and impairment were in the following CGUs: 2020 2019 2018 Vessel Ps. 303,516 — — Land transport (white pipelines) 123,044 — — Pipelines — 34,119,240 — Reversal of impairment 426,560 34,119,240 — Pipelines — — (40,288,338 ) (Impairment) — — (40,288,388 ) Reversal (impairment) net Ps. 426,560 34,119,240 (40,288,388 )
Assumptions to Determine Net Present Value of Reserves Long Lived Assets	As of December 31, 2020 2019 2018 2020 2019 2018 2020 2019 2018 Pipelines Landing transport Vessel Discount rate 11.97 % 11.94 % 13.55 % 11.97 % 11.94 % 13.55 % 11.97 % 11.94 % 13.55 % Useful life 22 23 26 5 5 6 19 19 21
Pemex Fertilizes [member]
Statement [LineItems]
Assumptions to Determine Net Present Value of Reserves Long Lived Assets	As of December 31, 2020, 2019 and 2018, Pemex Fertilizers recognized an impairment of Ps. (92,444), Ps. (2,298,775) and Ps. (2,246,264), respectively in CGUs mentioned above. The impairment was mainly caused from (i) the decrease in projected production due to the lack of raw material, (ii) increase in raw material prices, and (iii) decrease in ammonia prices. As of December 31, 2020 2019 2018 Plant Exchange rate 19.9487 18.8452 19.6829 Discount rate 9.51 % 10.15 % 8.92 % Useful life 22 23 26
PEMEX [member]
Statement [LineItems]
Summary of Net Impairment and Net Reversal of Impairment	As of December 31, 2020, 2019 and 2018, PEMEX recognized a net impairment of Ps. (36,353,700), Ps. (31,283,154) and a net reversal of impairment of Ps. 21,418,997, respectively, which is presented as a separate line item in the consolidated statement of comprehensive income as follows: 2020 2019 2018 (Impairment) Reversal of (Impairment) / (Impairment) Reversal of (Impairment) / (Impairment) Reversal of Reversal of Pemex Industrial Transformation (71,761,571 ) — (71,761,571) (1,275,480 ) 43,519,422 42,243,942 (13,788,470 ) 14,448,080 659,610 Pemex Exploration and Production (1) (31,882,681 ) 66,914,222 35,031,541 (133,523,711 ) 29,487,824 (104,035,887 ) (63,252,635 ) 128,266,251 65,013,616 Pemex Logistics — 426,560 426,560 — 34,119,240 34,119,240 (40,288,338 ) — (40,288,338 ) Pemex Fertilizers (92,444 ) — (92,444) (2,298,775 ) — (2,298,775 ) (2,246,264 ) — (2,246,264 ) PMI Azufre Industrial — 42,214 42,214 (796,263 ) — (796,263 ) — — — PMI NASA — — — (1,162,014 ) 646,603 (515,411 ) (1,719,627 ) — (1,719,627 ) Total (103,736,696 ) 67,382,996 (36,353,700) (139,056,243 ) 107,773,089 (31,283,154 ) (121,295,334 ) 142,714,331 21,418,997 (1) See Note 4 for the correction of error in the impairment of Pemex- Exploration and Production CGUs for 65,799,060.

Intangible Assets, Net (Tables)

Intangible Assets, Net (Tables)	12 Months Ended
	Dec. 31, 2020
Text block [abstract]
Schedule of Intangible Assets, Net are Wells Unassigned to a Reserve	A. Wells unassigned to a reserve 2020 2019 Wells unassigned to a reserve: Balance at the beginning of period Ps. 12,831,281 Ps. 9,779,239 Additions to construction in progress 23,237,519 17,028,974 Transfers against expenses (8,404,284 ) (7,990,877 ) Transfers against fixed assets (6,229,356 ) (5,986,055 ) Balance at the end of period Ps. 21,435,160 Ps. 12,831,281
Schedule of Other Components of Intangible Assets	B. Other intangible assets As of December 31, 2020 Licenses Exploration expenses, Total Cost Balance at the beginning of the year Ps. 4,593,100 2,174,063 6,767,163 Additions 375,801 27,785 403,586 Disposals (139,663 ) (527,489 ) (667,152 ) Effects of foreign exchange 56,067 94,741 150,808 Ps. 4,885,305 1,769,100 6,654,405 Amortization accumulated Balance at the beginning of the year Ps. (4,232,303 ) (781,617 ) (5,013,920 ) Disposals 138,099 132,935 271,034 Amortization (441,229 ) (37,759 ) (478,988 ) Effects of foreign exchange (56,681 ) (35,226 ) (91,907 ) (4,592,114 ) (721,667 ) (5,313,781 ) Balance at the end of the year Ps. 293,191 1,047,433 1,340,624 Useful lives 1 to 3 years Up to 36 years As of December 31, 2019 Licenses Exploration expenses, Total Cost Balance at the beginning of the year 4,391,069 2,255,551 Ps. 6,646,620 Additions 201,853 28,850 230,703 Effects of foreign exchange (13,436 ) (96,724 ) (110,160 ) 4,579,486 2,187,677 6,767,163 Amortization accumulated Balance at the beginning of the year (3,871,442 ) (743,865 ) Ps. (4,615,307 ) Amortization (386,414 ) (70,617 ) (457,031 ) Effects of foreign exchange 25,553 32,865 58,418 (4,232,303 ) (781,617 ) (5,013,920 ) Balance at the end of the year 347,183 1,406,060 Ps. 1,753,243 Useful lives 1 to 3 years Up to 36 years

Long-Term Notes Receivable, G_2

Long-Term Notes Receivable, Government Bonds And Other Assets (Tables)	12 Months Ended
	Dec. 31, 2020
Text block [abstract]
Summary of Long-Term Notes Receivable	A. Long-term notes receivable 2020 2019 Promissory notes issued by the Mexican Government Ps. — Ps. 121,624,852 Other long-term notes receivable (1) 886,827 940,454 Total long-term notes receivable Ps. 886,827 Ps. 122,565,306 (1) Mainly collection rights related to Value Added Tax from the non-recourse
Summary of Promissory Notes Issued	Promissory notes issued by the Mexican Government 2020 2019 Total promissory notes issued by the Mexican Government Ps. — Ps. 126,534,822 Less: current portion of notes receivable issued by the Mexican Government, net of expected credit losses (2) — 4,909,970 Long-term promissory notes Ps. — Ps. 121,624,852 (2) The amount reflects the principal and interest from promissory note 4 in 2019 matured on March 31, 2020.
Summary of Promissory Notes Maturity Dates and Annual Rates	As of December 31, 2019, PEMEX held promissory notes with a discounted value of Ps. 126,534,822. These promissory notes had annual maturity dates ranging from 2020 to 2036 and yielding rates ranging from 5.39% to 7.00%, as follows: As of December 31, 2019 Number of Promissory Notes Maturity Yield Rate Range Principal Amount 1 2020 5.39% Ps. 4,909,970 (1) 1 2021 5.57% 5,846,979 1 2022 5.74% 6,500,329 1 2023 5.88% 7,112,804 1 2024 5.99% 7,534,758 5 2025 to 2029 6.06% to 6.62% 40,018,603 5 2030 to 2034 6.70% to 6.90% 39,692,547 2 2035 to 2036 6.95% to 7.00% 14,918,832 Total promissory notes Ps. 126,534,822 Less: current portion 4,909,970 Long-term notes Ps. 121,624,852 (1) The amount of the promissory note is Ps. 4,917,970, less an impairment of Ps. 8,000.
Summary of Roll forward Related to the Promissory Notes	The roll-forward related to the promissory notes is as follows: December 31, 2020 (i) 2019 Balance at the beginning of the year Ps. 126,534,822 156,981,745 Long-term receivable from the Mexican Government (4,102,622 ) (32,493,666 ) Accrued interests 7,097,040 8,266,574 Interests received from promissory notes (881,048 ) (6,211,831 ) Reversal of (impairment) of the promissory notes 8,000 (8,000 ) Exchange from promissory notes to Bonds (128,656,192 ) — Balance at the end of the year Ps. — 126,534,822
Summary of Balance of Government Bonds	As of December 31, 2020, the balance of Government Bonds (see Note 15-A), 2020 Government bonds Ps. 129,549,519 Less: current portion of Government Bonds, net of expected credit losses (1) 18,036,557 Total long-term notes receivable Ps. 111,512,962 (1) Includes an expected credit loss of Ps. 17,581.
Summary of Roll forward of the Mexican Bonds	The roll-forward of the Mexican Bonds is as follows: 2020 Promissory notes value at the beginning of the exchange as of November 19, 2020 Ps. 128,656,192 Financial income from the Exchange of promissory notes to Bonds 130,419 Initial value of Mexican Bonds as of November 19, 2020 128,786,611 Accrued interests 2,103,099 Interests received from bonds (817,270 ) Impact of the valuation of bonds in UDIS (505,339 ) (Impairment) of bonds (17,582 ) Balance at the end of the year Ps. 129,549,519
Summary of Other Assets	At December 31, 2020 and 2019, the balance of other assets was as follows: December 31, 2020 2019 Payments in advance Ps. 5,223,679 2,650,251 Other (1) 1,680,934 1,518,801 Insurance 678,897 484,955 Total other assets Ps. 7,583,510 4,654,007

Debt (Tables)

Debt (Tables)	12 Months Ended
	Dec. 31, 2020
Text block [abstract]
Summary of Long-term Debt	As of December 31, 2020 and 2019, debt was as follows: 2020 Rate of interest (1) Maturity Pesos Foreign currency U.S. dollars Bonds Fixed from 1.7% to 9.5% and LIBOR plus 0.35% to 3.65% Various to 2060 1,290,409,906 U.S. 64,686,416 Project financing Fixed from 2.45% and LIBOR plus 0.24% to 1.75% Various to 2028 34,345,097 1,721,671 Direct loans Fixed to 5.25% and LIBOR plus 1.75% to 4.25% Various to 2031 28,275,087 1,417,390 Syndicated loans LIBOR plus 2.35% Various to 2024 49,871,676 2,499,996 Bank loans LIBOR plus 3.50% to 5.28% Various to 2023 1,170,542 58,678 Revolving credit lines LIBOR plus 2.00% to 3.75% and Fed effective plus 1.30% 2021 119,110,538 5,970,842 Financing of Infrastructure asset Fixed from 5.4% and 8.4% Various to 2036 28,131,267 1,410,180 Total financing in U.S. dollars 1,551,314,113 U.S. 77,765,173 Euros Bonds Fixed from 1.875% to 5.5% and EURIBOR plus 2.4% Various to 2030 307,867,094 € 12,614,815 Direct loans Fixed to 5.11% Various to 2023 12,202,600 500,000 Total financing in Euros 320,069,694 € 13,114,815 Japanese yen: Bonds Fixed from 0.54% to 3.5% Various to 2026 21,243,790 ¥ 109,900,621 Pesos Certificados bursátiles TIIE plus 1.00%, and fixed at 7.19% to 7.65% Various to 2026 113,253,512 Direct loans Fixed at 6.55% and TIIE plus 0.85% to 4.1% Various to 2029 19,061,275 Plus Factoring TIIE plus 1.25% to 2.0% In 2021 4,067,650 Syndicated loans TIIE plus 0.95% Various to 2025 19,740,035 Monetization of Mexican Government Bonds Fixed at 8.56275% Various to 2023 95,597,610 Total financing in pesos 251,720,082 UDIs Certificados bursátiles Zero rate and Fixed at 3.02% to 5.23% Various to 2035 37,346,014 Other currencies: Bonds Fixed from 1.75% to 8.25% Various to 2025 33,355,569 Total principal in pesos (2) 2,215,049,262 Plus: accrued interest 42,656,852 Notes payable to contractors (3) 1,021,203 Total principal and interest 2,258,727,317 Less: short-term maturities 347,755,237 Current portion of notes payable to contractors (3) 685,178 Accrued interest 42,656,852 Total short-term debt and current portion of long-term debt 391,097,267 Long-term debt 1,867,630,050 2019 Rate of interest (1) Maturity Pesos Foreign currency U.S. dollars Bonds Fixed from 1.7% to 9.5% and LIBOR plus 0.35% to 3.65% Various to 2050 1,118,518,559 U.S. $ 59,352,968 Project financing Fixed from 2.45% and LIBOR plus 0.24% to 1.75% Various to 2028 41,154,129 2,183,799 Direct loans Fixed from 2.50% to 5.25% and LIBOR plus 1.65% to 3.50% Various to 2031 62,698,930 3,327,050 Syndicated loans LIBOR plus 2.35% Various to 2024 47,107,647 2,499,716 Bank loans LIBOR plus 1.19% to 3.50% Various to 2023 1,862,411 98,827 Revolving credit lines LIBOR plus 1.85% 2020 12,626,284 670,000 Financing of Infrastructure asset Fixed from 5.4% and 8.4% Various to 2036 28,143,335 1,493,395 Total financing in U.S. dollars 1,312,111,295 U.S. $ 69,625,755 Euros Bonds Fixed from 1.875% to 5.5% and EURIBOR plus 2.4% Various to 2030 293,984,741 € 13,897,557 Direct loans Fixed to 5.11% and EURIBOR plus 2.5% Various to 2023 11,561,660 546,554 Total financing in Euros 305,546,401 € 14,444,111 Japanese yen: Bonds Fixed from 0.54% to 3.5% and LIBOR yen plus 0.75% Various to 2026 30,148,292 ¥ 173,865,582 Pesos Certificados bursátiles Mexican Government Treasury Certificates (“Cetes”) , TIIE (1) Various to 2026 133,409,581 Direct loans Fixed at 6.55% and 7.01% and TIIE plus 0.85% to 4.01% Various to 2029 38,558,166 Syndicated loans TIIE plus 0.95% Various to 2025 24,270,589 Revolving credit lines TIIE plus 1.50% and 1.95% Various to 2020 21,000,000 Total financing in pesos 217,238,336 UDIs Certificados bursátiles Zero rate and Fixed at 3.02% to 5.23% Various to 2035 41,388,521 Other currencies: Bonds Fixed from 1.5% to 8.25% Various to 2025 41,553,990 Total principal in pesos (2) 1,947,986,835 Plus: accrued interest 33,146,807 Notes payable to contractors (3) 2,040,446 Total principal and interest 1,983,174,088 Less: short-term maturities 210,530,524 Current portion of notes payable to contractors (3) 1,246,854 Accrued interest 33,146,807 Total short-term debt and current portion of long-term debt 244,924,185 Long-term debt 1,738,249,903
Summary of Changes in Consolidated Debt	The following table presents the roll-forward of total debt of PEMEX for each of the year ended December 31, 2020 and 2019, which includes short and long-term debt: 2020 (i) 2019 (i) Changes in total debt: At the beginning of the year Ps. 1,983,174,088 Ps. 2,082,286,116 Transfers to lease liabilities — (6,053,280 ) Loans obtained - financing institutions 1,292,197,518 1,167,834,946 Debt payments (1,151,962,147 ) (1,185,042,283 ) Accrued interest (ii) 144,207,950 128,061,187 Interest paid (130,989,150 ) (127,945,203 ) Foreign exchange 122,099,058 (75,967,395 ) At the end of the year Ps. 2,258,727,317 Ps. 1,983,174,088 (i) These amounts include accounts payable by Financed Public Works Contracts (“FPWC”) (formerly known as Multiple Services Contracts), which do not generate cash flows. (ii) For 2020 and 2019, includes Ps. 1,555,266 and Ps. (1,476,826), respectively, of income (expenses) consisting of Ps. 1,868,501 and Ps. (958,142), respectively, of expenses and discounts related to issuance of debt and Ps. (313,275) and Ps. (518,684), respectively, of fees to the issuance of debt.
Summary of Maturities of Long Term Debt Principal Outstanding and Accrued Interest	2021 2022 2023 2024 2025 2026 and thereafter Total Maturity of the total principal outstanding and accrued interest as of December 31, 2020, for each of the years ending December 31. 391,097,267 117,932,866 131,155,018 181,061,085 114,228,026 1,323,253,055 2,258,727,317
Summary of Notes Payable to Contractors	(3) The total amounts of notes payable to contractors as of December 31, 2020 and 2019, current and long-term, are as follows: 2020 2019 Total notes payable to contractors (a) (b) Ps. 1,021,204 Ps. 2,040,446 Less: current portion of notes payable to contractors 685,179 1,246,854 Notes payable to contractors (long-term) Ps. 336,025 Ps. 793,592 (a) PEMEX has entered into FPWCs pursuant to which the hydrocarbons and construction in progress are property of Pemex Exploration and Production. Pursuant to the FPWC, the contractors manage the work in progress, classified as development, infrastructure and maintenance. As of December 31, 2020 and 2019, PEMEX had an outstanding amount payable of Ps. 81,364 and Ps. 755,860, respectively. (b) During 2007, Pemex Exploration and Production contracted for the purchase of a Floating Production Storage and Offloading (“FPSO”) vessel. The investment in the vessel totaled U.S. $723,575. As of December 31, 2020 and 2019, the outstanding balances owed to the contractor were Ps. 939,839 (U.S. $47,112) and Ps. 1,284,587 (U.S. $68,165), respectively. In accordance with the contract, the estimated future payments are as follows:
Summary of Estimated Future Contract Payments	Year Amount 2021 33,005 2022 17,265 Less accrued interest 3,158 Total 47,112
Summary of Foreign Currency Translation	(4) As of December 31, 2020 and 2019 2020 2019 U.S. dollar Ps. 19.9487 Ps. 18.8452 Japanese yen 0.1933 0.1734 Pounds sterling 27.2579 24.9586 Euro 24.4052 21.1537 Swiss francs 22.5720 19.4596

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2020
Text block [abstract]
Summary of right-of-use assets	i. Rights of use assets are as follow: Rights of use assets Transportation and Plants Drilling (1) Rights of use Port facilities Buildings Lands Total Balance as of January 1, 2019 U.S. $ 40,029,595 24,099,662 6,223,655 1,922,291 371,348 75,771 38,258 72,760,580 Depreciation of the year (5,377,668 ) (1,854,894 ) (162,153 ) (86,342 ) (33,949 ) (16,015 ) (3,028 ) (7,534,049 ) Additions 895,291 3,448,691 — — 1,286,054 5,456 — 5,635,492 Currency translation effect (43,709 ) — — — — — — (43,709 ) Balance as of December 31, 2019 35,503,509 25,693,459 6,061,502 1,835,949 1,623,453 65,212 35,230 70,818,314 Depreciation of the year (4,868,961 ) (1,869,775 ) (122,874 ) (84,399 ) 355,505 (17,567 ) (2,951 ) (6,611,022 ) Cancellations (5,476,350 ) — — — — — — (5,476,350 ) Additions 97,891 — — — 438,951 — 579 537,421 Currency translation effect 12,292 — — — — 1,116 511 13,919 Impairment — — — (87,025 ) — — — (87,025 ) Balance as of December 31, 2020 25,268,381 23,823,684 5,938,628 1,664,525 2,417,909 48,761 33,369 59,195,257 Estimated useful life 1 to 10 years 14 years 10 years 23 years 20 years 1to 5 years 5 years
Summary of leases liabilities	ii. Leases liabilities are as follows: 2020 2019 Lease liabilities recognized at January 1, 2020 Ps. 68,148,627 70,651,797 Additions 625,410 5,683,676 Cancellations (6,578,337 ) — Payments of principal (7,979,972 ) (10,709,421 ) Accrued interest 5,398,964 4,800,153 Interests paid (2,030,829 ) — Foreign exchange 5,600,265 (2,277,578 ) Lease liabilities at December 31, 2020 Ps. 63,184,128 68,148,627
Summary of lease liabilities recognized in statement of comprehensive income	iii. Amounts recognized in the statement of comprehensive Income Total 2020 2019 Depreciation of rights of use Ps. 7,229,231 7,429,275 Interests from lease liabilities 5,784,476 5,360,072 Expenses related to short-term leases 7,631 58,701
Summary of lease liabilities recognized in statement of cash flows	iv. Amounts recognized in the statement of cash flows Total 2020 2019 Lease payments (principal and interests) Ps. (10,010,801 ) (10,709,421 )

Derivative Financial Instrume_2

Derivative Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2020
Investments accounted for using equity method [abstract]
Summary of debt instruments and DFI	This portfolio is composed of debt instruments and DFIs as shown below: Notional Amounts (in thousands of each Currency) U.S. $ Debt (3,972,777 ) DFIs Interest Rate Swaps 400,000 Interest Rate Options (2,500,000 )
Details of Interest Rate Sensitivity	INTEREST RATE and CURRENCY DFIs Interest rate sensitivity to + 10 bp Interbank Yield Curves PEMEX Curves Currency Sensitivity Sensitivity DFIs Sensitivity Sensitivity debt CHF 1,472 (1,318 ) 154 1,352 Euro 75,107 (59,653 ) 15,454 56,790 Pound Sterling 4,123 (3,845 ) 278 3,469 Yen 5,478 (2,202 ) 3,276 4,314 Peso 32,446 731 33,177 25,855 UDI 12,935 (12,935 ) 0 7,093 U.S. dollar 1,425,168 198,150 1,623,318 482,311 Figures not audited
Details of Interest Rate and Currency Derivative Financial Instruments	INTEREST RATE and CURRENCY DFIs Exchange rate sensitivity +1% and VaR 95% Interbank Yield Curves PEMEX Curves Currency Sensitivity Sensitivity Sensitivity VaR 95% Sensitivity Debt CHF (6,206 ) 6,168 (38 ) (29 ) (5,840 ) Euro (195,594 ) 133,604 (61,990 ) (47,729 ) (165,822 ) Pound Sterling (12,857 ) 12,804 (54 ) (53 ) (11,535 ) Yen (11,453 ) 3,123 (8,330 ) (6,304 ) (9,423 ) Peso (138,257 ) (18,326 ) (156,583 ) (247,424 ) (121,302 ) UDI (21,795 ) 21,795 (0 ) (0 ) (15,376 ) Figures not audited
Details of Current and Potential Exposures and Aggregated By Credit Rating	The current and potential exposures, aggregated by credit rating, are as follows: Maximum Credit Exposure by term in Petróleos Mexicanos Rating Current Less than 1-3 years 3-5 years 5-7 years 7-10 years More A+ 159,107 688,392 558,981 306,952 117,716 119,358 — A 18,079 248,971 338,829 301,736 167,414 100,000 — A- (19,996 ) 365,910 294,322 131,104 122,823 — — BBB+ 397,989 546,936 720,605 613,680 556,650 261,542 174,457 BBB 211,862 466,967 767,225 867,931 648,179 438,457 320,565 BBB- (10,213 ) 99,334 178,698 175,904 136,312 139,725 — Figures not audited
Details of Quantitative Disclosure of Debt Cash Flow's Maturities	Quantitative Disclosure of Debt Cash Flow Maturities as of December 31, 2020 (1) Year of expected maturity date 2021 2022 2023 2024 2025 2026 Thereafter Total Fair Value Liabilities Outstanding debt Fixed rate (U.S. dollars) Ps. 47,898,708 Ps. 32,956,060 Ps. 48,471,704 Ps. 25,996,376 Ps. 49,333,976 Ps. 1,116,179,110 Ps. 1,320,835,934 Ps. 1,347,156,276 Average interest rate (%) 6.37 % Fixed rate (Japanese yen) — — 5,799,000 — — 15,444,790 21,243,790 18,797,463 Average interest rate (%) 1.35 % Fixed rate (pounds sterling) — 9,537,663 — — 12,204,125 — 21,741,788 23,010,709 Average interest rate (%) 5.72 % Fixed rate (pesos) 115,284,491 1,999,401 — 57,433,886 — 31,029,696 205,747,474 199,047,983 Average interest rate (%) 7.91 % Fixed rate (UDIs) 4,314,460 — — — — 33,031,555 37,346,014 30,673,537 Average interest rate (%) 4.03 % Fixed rate (euros) 42,716,224 38,987,905 34,137,539 30,418,586 40,230,700 117,736,691 304,227,645 315,417,306 Average interest rate (%) 3.77 % Fixed rate (Swiss francs) 3,385,165 — 8,228,615 — — — 11,613,780 11,650,958 Average interest rate (%) 1.93 % Total fixed rate debt 213,599,047 83,481,030 96,636,858 113,848,848 101,768,801 1,313,421,841 1,922,756,425 1,945,754,232 Variable rate (U.S. dollars) 122,317,252 25,979,932 11,649,479 56,443,974 5,602,565 9,506,180 231,499,382 228,630,238 Variable rate (Japanese yen) — — Variable rate (euros) — — 15,842,049 — — — 15,842,049 15,375,645 Variable rate (pesos) 12,524,115 8,471,904 7,026,631 10,768,263 6,856,660 325,035 45,972,609 42,934,001 Total variable rate debt 134,841,368 34,451,836 34,518,160 67,212,237 12,459,225 9,831,215 293,314,040 286,939,885 Total debt Ps. 348,440,415 Ps. 117,932,866 Ps. 131,155,018 Ps. 181,061,085 Ps. 114,228,026 Ps. 1,323,253,056 Ps. 2,216,070,465 Ps. 2,232,694,117 Note: Numbers may not total due to rounding. (1) The information in this table has been calculated using exchange rates at December 31, 2020 of: Ps. 19.9487 = U.S. $1.00; Ps. 0.1933 = 1.00 Japanese yen; Ps. 27.2579 = 1.00 pound sterling; Ps. 6.605597 = 1.00 UDI; Ps. 24.4052 = 1.00 euro; and Ps. 22.5720 = 1.00 Swiss franc. Quantitative Disclosure of Debt Cash Flow Maturities as of December 31, 2019 (1) Year of expected maturity date 2020 2021 2022 2023 2024 2025 Thereafter Total Carrying Value Fair Value Liabilities Outstanding debt Fixed rate (U.S. dollars) Ps. 52,874,594 Ps. 36,474,941 Ps. 36,288,484 Ps. 51,814,555 Ps. 24,377,105 Ps. 959,097,000 Ps. 1,160,926,679 Ps. 1,233,260,685 Average interest rate (%) 6.2535 % Fixed rate (Japanese yen) — — — 5,202,000 — 13,848,692 19,050,692 17,812,094 Average interest rate (%) 1.3483 % Fixed rate (pounds sterling) — — 8,725,102 — — 11,157,892 19,882,994 21,733,929 Average interest rate (%) 5.7247 % Fixed rate (pesos) 10,009,595 20,004,204 1,999,293 — 57,381,081 30,985,764 120,379,937 114,148,170 Average interest rate (%) 7.4867 % Fixed rate (UDIs) 5,137,194 4,183,481 — — — 32,067,846 41,388,521 37,209,163 Average interest rate (%) 4.0514 % Fixed rate (euros) 27,490,652 36,993,461 33,752,122 29,564,507 26,321,684 136,705,664 290,828,090 314,159,720 Average interest rate (%) 3.7095 % Fixed rate (Swiss francs) 11,669,169 2,920,578 — 7,081,249 — — 21,670,996 22,167,273 Average interest rate (%) 1.6996 % Total fixed rate debt 107,181,204 100,576,665 80,765,001 93,662,311 108,079,870 1,183,862,858 1,674,127,909 1,760,491,034 Variable rate (U.S. dollars) 37,129,938 14,165,499 23,671,360 10,931,702 53,275,137 14,051,426 153,225,062 153,747,749 Variable rate (Japanese yen) 11,097,600 — — — — — 11,097,600 11,112,957 Variable rate (euros) 983,647 — — 13,734,663 — — 14,718,310 14,969,735 Variable rate (pesos) 55,384,990 8,456,465 8,435,081 6,991,763 10,600,586 6,989,516 96,858,401 96,135,647 Total variable rate debt 104,596,175 22,621,964 32,106,441 31,658,128 63,875,723 21,040,942 275,899,373 275,966,088 Total debt Ps. 211,777,379 Ps. 123,198,629 Ps. 112,871,442 Ps. 125,320,439 Ps. 171,955,593 Ps. 1,204,903,800 Ps. 1,950,027,282 Ps. 2,036,457,122 Note: Numbers may not total due to rounding. (1) The information in this table has been calculated using exchange rates at December 31, 2019 of: Ps. 18.8452 = U.S. $1.00; Ps. 0.1734 = 1.00 Japanese yen; Ps. 24.9586
Summary of Financial Liabilities Interest And Principal Cash Flow Maturities	The following tables show the estimated amount of principal and interest cash flow maturities of PEMEX’s financial liabilities as of December 31, 2020 and 2019 (DFIs are not included): Financial Liabilities Interest and Principal Cash Flow Maturities as of December 31, 2020 (1) Year of expected maturity date Total Carrying 2021 2022 2023 2024 2025 2026 Total Financial Liabilities Suppliers 281,978,041 281,978,041 — — — — — 281,978,041 Accounts and accrued expenses Payable 30,709,497 30,709,497 — — — — — 30,709,497 Leases 63,184,128 12,899,935 8,695,992 8,660,013 8,151,473 7,392,278 54,962,972 100,762,663 Debt 2,258,727,317 386,573,778 230,702,075 322,593,741 277,735,672 203,016,590 2,243,851,381 3,664,473,237 Total Ps.2,634,598,983 Ps.712,161,251 Ps.239,398,067 Ps.331,253,754 Ps.285,887,145 Ps.210,408,868 Ps.2,298,814,353 Ps.4,077,923,438 Note: Numbers may not total due to rounding. (1) The information in this table has been calculated using exchange rates on December 31, 2020 of: Ps. 19.9487 = U.S. $1.00; Ps. 0.1933 = 1.00 Japanese yen; Ps. 27.2579 Financial Liabilities Interest and Principal Cash Flow Maturities as of December 31, 2019 (1) Year of expected maturity date Total Carrying 2020 2021 2022 2023 2024 2025 Total Financial Liabilities Suppliers 208,034,407 208,034,407 — — — — — 208,034,407 Accounts and accrued expenses Payable 26,055,151 26,055,151 — — — — — 26,055,151 Leases 68,148,628 11,424,336 9,982,471 9,507,408 9,493,269 9,361,805 62,776,808 112,546,097 Debt 1,983,174,088 312,757,186 222,227,670 205,355,068 213,879,603 254,613,606 2,104,560,030 3,313,393,163 Total Ps.2,285,412,274 Ps.558,271,080 Ps.232,210,141 Ps.214,862,476 Ps.223,372,872 Ps.263,975,411 Ps.2,167,336,838 Ps.3,660,028,818 Note: Numbers may not total due to rounding. (1) The information in this table has been calculated using exchange rates at December 31, 2019 of: Ps. 18.8452 = U.S. $1.00; Ps. 0.1734 = 1.00 Japanese yen; Ps. 24.9586
Summary of Fair Values and Notional Amounts of DFIs that were designated as non-hedges	December 31, 2020. December 31, 2019 DFI Position Notional Fair Value Notional Fair Value Interest rate swaps PEMEX pays fixed in U.S. dollar and receives floating in 3-month 9,350,953 (330,814 ) 11,189,338 (79,096 ) Interest rate swaps PEMEX pays fixed in U.S. dollar and receives floating in 6-month 9,724,991 (370,094 ) 11,024,442 (9,181 ) Cross-currency swaps PEMEX pays the 28-day 33,513,214 6,834,051 37,742,553 3,116,439 Cross-currency swaps PEMEX pays floating in 6-month 6-month — — 12,419,108 (1,403,975 ) Cross-currency swaps PEMEX pays fixed in U.S. dollar and receives fixed in Japanese yen. 4,814,650 505,772 4,548,319 316,373 Cross-currency swaps PEMEX pays floating in 3-month 3-month 15,277,498 761,958 14,432,394 (523,552 ) Cross-currency swaps PEMEX pays fixed in U.S. dollar and receives fixed in euro. 277,574,150 9,177,152 292,557,157 (5,606,276 ) Cross-currency swaps PEMEX pays floating in 6-month 9,781,187 712,072 9,204,373 526,632 Cross-currency swaps PEMEX pays fixed in U.S. dollar and receives fixed in pound sterling. 11,802,848 126,965 11,149,951 (9,852 ) Cross-currency swaps PEMEX pays fixed in U.S. dollar and receives fixed in CHF. 10,300,166 913,809 20,729,537 797,159 Interest Rate Options PEMEX Buy Cap, Sell Floor on floating in U.S. dollar LIBOR 1M. 49,871,750 (1,331,187 ) — — Currency Options PEMEX Buy Put, Sell Put and Sell Call on Japanese yen 15,456,770 14,918 13,881,133 123,244 Currency Options PEMEX Buy call, Sell Call and Sell Put on euro 121,240,404 3,167,805 105,123,586 360,731 Currency Options PEMEX Sell Call on pound sterling 12,271,443 (85,994 ) 11,242,387 (81,137 ) Currency Options PEMEX Sell Call on CHF 8,225,571 (70,196 ) 7,116,252 (74,535 ) Currency Options PEMEX Sell Call on euro 104,181,452 (2,118,100 ) 66,560,662 (1,223,283 ) Interest rate swaps PEMEX pays fixed in U.S. dollar and receives floating in U.S. dollar LIBOR 1M. 482,561 (11,199 ) 768,561 (10,954 ) Subtotal 17,896,918 (3,781,263 ) December 31, 2020 December 31, 2019 IFD Volume (MMb) Fair Value Volume (MMb) Fair Value Crude oil Options PEMEX buys Put and sells Put 55.20 (1,266,940 ) 85.05 (1,372,577 ) December 31, 2020 December 31, 2019 DFI Market Volume (MMb) Fair value Volume (MMb) Fair value Futures Exchange traded 0.64 Ps.(32,340 ) 2.4 Ps.(124,835 ) Petroleum Products Swaps Exchange traded (1.48 ) Ps.(95,572 ) 4.3 Ps.(318,410 ) Notes: Amounts may not total due to rounding. (1) The fair value of the Futures and the Petroleum Products Swaps was recognized as “Cash and cash equivalents” in the statement of financial position because PEMEX considered these financial assets to be fully liquid.
Summary of Location on the Consolidated Statement of Financial Position and the Fair Value of DFIs	The following table presents the fair value of PEMEX’s DFIs that are included in the consolidated statement of financial position in Derivative financial instruments (including both DFIs that have not reached maturity and those that have reached maturity but have not been settled), as of December 31, 2020 and 2019: Derivatives assets December 31, 2020 December 31, 2019 Derivatives not designated as hedging instruments Crude oil options Ps. — Ps. — Currency options 3,184,942 559,751 Natural gas options — — Cross-currency swaps 22,763,051 10,936,579 Natural gas swaps — — Interest rate swaps — — Others — — Total derivatives not designated as hedging instruments 25,947,993 11,496,330 Total assets Ps. 25,947,993 Ps. 11,496,330 Derivatives liabilities December 31, 2020 December 31, 2019 Derivatives not designated as hedging instruments Crude oil options Ps.(1,266,940 ) Ps.(1,372,577 ) Currency options (2,219 ) (75,776 ) Natural gas options — — Interest rate options (1,331,187 ) — Cross-currency swaps (6,005,562 ) (15,102,586 ) Natural gas swaps — — Interest rate swaps (712,107 ) (99,232 ) Others — — Total derivatives not designated as hedging instruments (9,318,015 ) (16,650,171 ) Total liabilities Ps. (9,318,015 ) Ps. (16,650,171 ) Net total Ps. 16,629,978 Ps. (5,153,841 )
Summary of Net Gain (Loss) Recognized in Income on Derivative Financial Instruments	Accounting treatment PEMEX enters into derivatives transactions with the sole purpose of hedging financial risks related to its operations, firm commitments, planned transactions and assets and liabilities recorded on its statement of financial position. Nonetheless, some of these transactions do not qualify for hedge accounting treatment because they do not meet the requirements of the accounting standards for designation as hedges. They are therefore recorded in the financial statements as instruments entered into for trading purposes, despite the fact that their cash flows are offset by the cash flows of the positions (assets or liabilities) to which they relate. As a result, the changes in their fair value are recognized in the “Derivative financial instruments (cost) income, net” line item in the consolidated statement of comprehensive income. As of December 31, 2020 and 2019, the net fair value of PEMEX’s DFIs (including both DFIs that have not reached maturity and those that have reached maturity but have not been settled), recognized in the consolidated statement of financial position, was Ps. 16,629,978 and Ps. (5,153,841), respectively. As of December 31, 2020 and 2019, PEMEX did not have any DFIs designated as hedges. The following table shows the fair values and notional amounts of PEMEX’s DFIs, including those with an open position and those that have matured but that have not been settled, which were designated as non-hedges • DFI’s fair value includes CVA and is calculated based on market quotes obtained from market sources such as Bloomberg and PIP. • Fair value is calculated internally, either by discounting cash flows with the corresponding zero-coupon December 31, 2020. December 31, 2019 DFI Position Notional Fair Value Notional Fair Value Interest rate swaps PEMEX pays fixed in U.S. dollar and receives floating in 3-month 9,350,953 (330,814 ) 11,189,338 (79,096 ) Interest rate swaps PEMEX pays fixed in U.S. dollar and receives floating in 6-month 9,724,991 (370,094 ) 11,024,442 (9,181 ) Cross-currency swaps PEMEX pays the 28-day 33,513,214 6,834,051 37,742,553 3,116,439 Cross-currency swaps PEMEX pays floating in 6-month 6-month — — 12,419,108 (1,403,975 ) Cross-currency swaps PEMEX pays fixed in U.S. dollar and receives fixed in Japanese yen. 4,814,650 505,772 4,548,319 316,373 Cross-currency swaps PEMEX pays floating in 3-month 3-month 15,277,498 761,958 14,432,394 (523,552 ) Cross-currency swaps PEMEX pays fixed in U.S. dollar and receives fixed in euro. 277,574,150 9,177,152 292,557,157 (5,606,276 ) Cross-currency swaps PEMEX pays floating in 6-month 9,781,187 712,072 9,204,373 526,632 Cross-currency swaps PEMEX pays fixed in U.S. dollar and receives fixed in pound sterling. 11,802,848 126,965 11,149,951 (9,852 ) Cross-currency swaps PEMEX pays fixed in U.S. dollar and receives fixed in CHF. 10,300,166 913,809 20,729,537 797,159 Interest Rate Options PEMEX Buy Cap, Sell Floor on floating in U.S. dollar LIBOR 1M. 49,871,750 (1,331,187 ) — — Currency Options PEMEX Buy Put, Sell Put and Sell Call on Japanese yen 15,456,770 14,918 13,881,133 123,244 Currency Options PEMEX Buy call, Sell Call and Sell Put on euro 121,240,404 3,167,805 105,123,586 360,731 Currency Options PEMEX Sell Call on pound sterling 12,271,443 (85,994 ) 11,242,387 (81,137 ) Currency Options PEMEX Sell Call on CHF 8,225,571 (70,196 ) 7,116,252 (74,535 ) Currency Options PEMEX Sell Call on euro 104,181,452 (2,118,100 ) 66,560,662 (1,223,283 ) Interest rate swaps PEMEX pays fixed in U.S. dollar and receives floating in U.S. dollar LIBOR 1M. 482,561 (11,199 ) 768,561 (10,954 ) Subtotal 17,896,918 (3,781,263 ) December 31, 2020 December 31, 2019 IFD Volume (MMb) Fair Value Volume (MMb) Fair Value Crude oil Options PEMEX buys Put and sells Put 55.20 (1,266,940 ) 85.05 (1,372,577 ) December 31, 2020 December 31, 2019 DFI Market Volume (MMb) Fair value Volume (MMb) Fair value Futures Exchange traded 0.64 Ps.(32,340 ) 2.4 Ps.(124,835 ) Petroleum Products Swaps Exchange traded (1.48 ) Ps.(95,572 ) 4.3 Ps.(318,410 ) Notes: Amounts may not total due to rounding. (1) The fair value of the Futures and the Petroleum Products Swaps was recognized as “Cash and cash equivalents” in the statement of financial position because PEMEX considered these financial assets to be fully liquid. The exchange rate for U.S. dollars as of December 31, 2020 and 2019 was Ps. 19.9487 and Ps. 18.8452 per U.S. dollar, respectively. The exchange rate for euros as of December 31, 2020 and 2019 was Ps. 24.4052 and Ps. 21.1537 per euro, respectively. For the years ended December 31, 2020, 2019 and 2018, PEMEX recognized a net gain (loss) of Ps. 17,096,141, Ps. (23,263,923) and Ps. (19,115,951), respectively, in the “Derivative financial instruments (cost) income, net” line item with respect to DFIs treated as instruments entered into for trading purposes. The following table presents the fair value of PEMEX’s DFIs that are included in the consolidated statement of financial position in Derivative financial instruments (including both DFIs that have not reached maturity and those that have reached maturity but have not been settled), as of December 31, 2020 and 2019: Derivatives assets December 31, 2020 December 31, 2019 Derivatives not designated as hedging instruments Crude oil options Ps. — Ps. — Currency options 3,184,942 559,751 Natural gas options — — Cross-currency swaps 22,763,051 10,936,579 Natural gas swaps — — Interest rate swaps — — Others — — Total derivatives not designated as hedging instruments 25,947,993 11,496,330 Total assets Ps. 25,947,993 Ps. 11,496,330 Derivatives liabilities December 31, 2020 December 31, 2019 Derivatives not designated as hedging instruments Crude oil options Ps.(1,266,940 ) Ps.(1,372,577 ) Currency options (2,219 ) (75,776 ) Natural gas options — — Interest rate options (1,331,187 ) — Cross-currency swaps (6,005,562 ) (15,102,586 ) Natural gas swaps — — Interest rate swaps (712,107 ) (99,232 ) Others — — Total derivatives not designated as hedging instruments (9,318,015 ) (16,650,171 ) Total liabilities Ps. (9,318,015 ) Ps. (16,650,171 ) Net total Ps. 16,629,978 Ps. (5,153,841 ) The following tables presents the net gain (loss) recognized in income on PEMEX’s DFIs for the years ended December 31, 2020, 2019 and 2018, in the consolidated statement of comprehensive income which is presented in the “Derivative financial instruments (cost) income, net” line item: Derivatives not Amount of gain (loss) recognized in the Statement of operations on December 31, 2020 December 31, 2019 December 31, 2018 Forwards Ps. — Ps. — Ps. 2,007,393 Futures (1,612,650 ) (1,460,990 ) 374,112 Crude oil options 4,996,014 (2,762,358 ) 2,329,051 Currency options 2,698,749 (2,447,050 ) (2,210,301 ) Natural gas options — 49 185 Interest rate options (1,802,514 ) — — Cross-currency swaps 13,770,848 (16,019,238 ) (21,902,567 ) Crude oil futures swaps (176,341 ) — — Natural gas swaps — 2 117 Interest rate swaps (777,965 ) (574,338 ) 286,059 Others — — — Total Ps. 17,096,141 Ps. (23,263,923 ) Ps. (19,115,951 )

Employee Benefits (Tables)

Employee Benefits (Tables)	12 Months Ended
	Dec. 31, 2020
Statement [LineItems]
Summary of Amounts Associated with PEMEX's Labor Obligations	The following table show the amounts associated with PEMEX’s labor obligations: December 31, 2020 2019 Liability for defined benefits at retirement and post-employment at the end of the year Ps. 1,516,671,029 Ps. 1,438,849,732 Liability for other long-term benefits 18,497,057 17,965,635 Total liability for defined benefits recognized in the consolidated statement of financial position at the end of the year Ps. 1,535,168,086 Ps. 1,456,815,367
Summary of Amounts Recognized for Long-term Obligations	The following tables contain detailed information regarding PEMEX’s retirement and post-employment benefits: December 31, Changes in the liability for defined benefits 2020 2019 Liability for defined benefits at the beginning of the year Ps. 1,438,849,732 Ps. 1,067,317,120 Current Service cost 22,742,631 15,871,004 Net interest 105,699,575 95,643,572 Defined benefits paid by the fund (5,168,608 ) (5,759,721 ) Actuarial losses (gains) in other comprehensive results due to: Change in financial assumptions (1) 77,094,827 304,527,285 Change in demographic assumptions (1) (18,581,935 ) (9,012,031 ) For experience during the year (1) (41,069,054 ) 25,228,095 Assets of the plan during the year (1) 32,531 (43,628 ) Effect of the liability ceiling * — (127,137 ) Real interest, excluding earned interests * — (363,873 ) Adjustment to the Defined Contribution Plan * — 61,583 Remeasurements — (96,828 ) Contributions paid to the fund (62,928,670 ) (54,395,709 ) Defined benefit liabilities at end of year Ps. 1,516,671,029 Ps. 1,438,849,732 * The concepts come from the valuation of PMI CIM´s liabilities . (1) The amount of actuarial losses corresponding to retirement and post-employment benefits recognized in other comprehensive income net of deferred income tax for Ps. (19,182,373) in the year ended December 31, 2020, corresponded mainly to the decrease in the discount rate, from 7.53% in 2019 to 7.08% in 2020, as well as the decrease in the salary increase rate, from 5.02% in 2019 to 4.47% in 2020, and the gradual increase in the rate of mortality for non-disabled December 31, Changes in pension plan assets 2020 2019 Plan assets at the beginning of year Ps. 2,585,007 Ps. 7,200,471 Return on plan assets 262,273 833,638 Payments by the pension fund (63,204,515 ) (59,967,278 ) Company contributions to the fund 62,928,670 54,395,709 Actuarial (gains) losses in plan assets (32,531 ) 43,683 Effect of the liability ceiling — 157,774 Adjustment to the Defined Contribution Plan * (100,180 ) (61,582 ) Clearance Price * — (17,408 ) Pension plan assets at the end of year Ps. 2,438,724 Ps. 2,585,007 * The concepts come from the valuation of PMI CIM´s liabilities.
Summary of Amounts and Types of Plan Assets	As of December 31, 2020 and 2019, the amounts and types of plan assets are as follows: December 31, Plan Assets 2020 2019 Cash and cash equivalents Ps. 10,845 Ps. 138,795 Debt instruments 2,427,879 2,446,212 Total plan assets Ps. 2,438,724 Ps. 2,585,007 December 31, Changes in Defined Benefit Obligations (DBO) 2020 2019 Defined benefit obligations at the beginning of the year Ps. 1,441,356,415 Ps. 1,074,233,038 Service costs 20,793,204 14,516,102 Financing costs 105,802,122 96,350,258 Past service costs — 77,045 Payments by the fund (68,295,593 ) (65,727,000 ) Actuarial (losses) gains due to: Change in financial assumptions 77,094,827 304,527,285 Change in demographic assumptions (18,581,935 ) (9,012,031 ) For experience during the year (41,069,054 ) 25,228,095 Obligations settled — (14,237 ) Reductions 34,789 (129,909 ) Modifications to the pension plan 1,949,427 1,307,769 Defined benefit obligations at the end of year Ps. 1,519,084,202 Ps. 1,441,356,415
Summary of Additional Fair value Disclosure About Plan Assets and Indicate Their Rank	The following tables present additional fair value disclosure about plan assets and indicate their rank, in accordance with IFRS 13, as of December 31, 2020 and 2019: Fair value measurements as of December 31, 2020 Plan assets Quoted prices in active markets for identical assets (level 1) Significant observable inputs (level 2) Significant unobservable inputs (level 3) Total Cash and cash equivalents Ps. 10,845 Ps. — Ps. — Ps. 10,845 Debt instruments 2,427,879 — — 2,427,879 Total Ps. 2,438,724 Ps. — Ps. — Ps. 2,438,724 Fair value measurements as of December 31, 2019 Plan assets Quoted prices in active markets for identical assets (level 1) Significant observable inputs (level 2) Significant unobservable inputs (level 3) Total Cash and cash equivalents Ps. 138,795 Ps. — Ps. — Ps. 138,795 Debt instruments 2,446,212 — — 2,446,212 Total Ps. 2,585,007 Ps. — Ps. — Ps. 2,585,007
Summary of Principal Actuarial Assumptions Used in Determining the Defined Benefit Obligation	As of December 31, 2020 and 2019, the principal actuarial assumptions used in determining the defined benefit obligation for the plans are as follows: December 31, 2020 2019 Rate of increase in salaries 4.47 % 5.02 % Rate of increase in pensions 4.00 % 4.00 % Rate of increase in post-mortem pensions 0.00 % 0.00 % Rate of increase in medical services 7.65 % 7.65 % Inflation assumption 4.00 % 4.00 % Rate of increase in basic basket for active personnel 5.00 % 5.00 % Rate of increase in basic basket for retired personnel 4.00 % 4.00 % Rate of increase in gas and gasoline 4.00 % 4.00 % Discount and return on plan assets rate (1) 7.08 % 7.53 % Average length of obligation (years) 17.52 17.52 (1) In accordance with IAS 19, the discount rate was determined using as a reference the interest rates observed in Mexican Government bonds denominated in pesos (Cetes and M bonds), as well as the flow of payments expected to cover contingent obligations. As a result of the performance in financial instruments mentioned above, the discount rate for 2020 had a decrease in respect to discount rate of 2019.
Other long-term benefits [member]
Statement [LineItems]
Summary of Amounts Recognized for Long-term Obligations	The amounts recognized for long-term obligations for the years ended December 31, 2020 and 2019 are as follows: December 31, Change in the liability for defined benefits 2020 2019 Liabilities defined benefit at the beginning of year Ps. 17,965,635 Ps. 13,224,926 Charge to income for the year 2,865,809 2,164,866 Actuarial losses (gains) recognized in income due to: Change in financial assumptions 912,673 5,007,261 Change in demographic assumptions (439,969 ) (245,829 ) For experience during the year (2,806,112 ) (2,418,954 ) Real interest, excluding earned interests * — 264,917 Effect of the liability ceiling * — (30,638 ) Adjustment to the Defined Contribution Plan * — (914 ) Benefits paid (979 ) — Liabilities defined benefit at the end of year Ps. 18,497,057 Ps. 17,965,635 * The concepts come from the valuation of PMI CIM´s liabilities.
Actuarial assumption of expected rates of salary increases [member]
Statement [LineItems]
Summary of Principal Actuarial Assumptions Used in Determining the Defined Benefit Obligation	The effects previously mentioned, were determined using the projected unit credit method which was the same used in the prior valuation. December 31, 2020 2019 Rate of increase in salaries 4.47 % 5.02 % Inflation assumption 4.00 % 4.00 % Rate of increase in basic basket for active personnel 5.00 % 5.00 % Rate of increase in basic basket for retired personnel 4.00 % 4.00 % Rate of increase in gas and gasoline 4.00 % 4.00 % Discount and return on plan assets rate 7.08 % 7.53 % Average length of obligation (years) 17.52 17.52

Provisions for Sundry Credito_2

Provisions for Sundry Creditors (Tables)	12 Months Ended
	Dec. 31, 2020
Text block [abstract]
Summary of Provisions for Sundry Creditors and Others	At December 31, 2020 and 2019, the provisions for sundry creditors and others is as follows: 2020 2019 Provision for plugging of wells (Note 13) Ps. 77,125,513 Ps. 80,849,900 Provision for trails in process (Note 27) 8,321,816 8,075,031 Provision for environmental costs 9,178,555 9,086,977 Ps. 94,625,884 Ps. 98,011,908
Summary of Allowance Account for Plugging of Wells, Trials in Progress and Environmental Costs	The following tables show the allowance account for plugging of wells, trials in progress and environmental costs: Plugging of wells 2020 2019 Balance at the beginning of the year Ps. 80,849,900 Ps. 84,050,900 (Decrease) Increase capitalized in fixed assets (12,816,336 ) (2,826,003 ) Unwinding of discount against income 4,555,692 3,318,384 Unrealized foreign exchange loss (gains) 4,766,921 (3,577,200 ) Amount used (230,664 ) (116,181 ) Balance at the end of the year Ps. 77,125,513 Ps. 80,849,900 Trials in progress 2020 2019 Balance at the beginning of the year Ps. 8,075,031 Ps. 6,483,078 Additions against expenses 972,692 1,901,930 Provision cancellation (724,026 ) (309,977 ) Amount used (1,881 ) — Balance at the end of the year Ps. 8,321,816 Ps. 8,075,031 Environmental costs 2020 2019 Balance at the beginning of the year Ps. Ps. Additions against expenses 1,669,063 4,745,835 Cancellation against expenses (1,574,810 ) (6,873,905 ) Amount used (2,675 ) (4,231 ) Balance at the end of the year (1) Ps. 9,178,555 Ps. 9,086,977
Summary of provisions for plugging of wells	Moreover, the time of plugging depends on when the fields cease to have economically viable production rates, which, in turn, depends on the inherently uncertain future prices of oil and gas. Well plugging of works will be carried out as follows: Year Amount 2021 Ps. 2,858,989 2022 2,197,972 2023 3,167,257 2024 3,456,396 2025 6,110,317 More than 5 years 59,334,582 Total Ps. 77,125,513

Income Taxes and Duties (Tables

Income Taxes and Duties (Tables)	12 Months Ended
	Dec. 31, 2020
Text block [abstract]
Summary of Total DUC and Others	Total DUC and other as of December 31, 2020, 2019 and 2018 are integrated as follows: 2020 2019 2018 DUC Ps. 218,912,687 Ps. 343,242,476 Ps. 443,294,170 Fiscal credit (65,000,000 ) — — DUC from prior years — (39 ) 14,883 Other — — 446,464 Deferred DUC expense 696,449 29,570,063 26,178,078 Total DUC and other Ps. 154,609,136 Ps. 372,812,500 Ps. 469,933,595
Summary of Principal Factors Generating the Deferred DUC	The principal factors generating the deferred DUC are the following: 2020 2019 Deferred DUC asset: Tax credits Ps. 572,796,156 Ps. 546,317,620 Deferred Profit-sharing duty liability: Wells, pipelines, properties, plant and equipment (208,999,954 ) (151,479,977 ) Deferred DUC asset net 363,796,202 394,837,643 Unrecognized Deferred DUC (355,374,599 ) (385,719,589 ) Net, deferred DUC asset Ps. 8,421,603 Ps. 9,118,054
Summary of Expected Benefit for DUC	The expected expense for DUC in 2019 was different from that which would result from applying the 65.0% rate to the tax base, as a result of the line items mentioned in the next table. 2020 2019 2018 Expected (benefit) expense: Ps. (20,837,768 ) Ps. 43,432,712 Ps. 307,269,035 Increase (decrease) resulting from: Expected benefit contract (496,643 ) (4,948,542 ) (5,797,144 ) Duties from prior year — (26 ) 9,860 Non-cumulative (1) (2,291,937,519 ) (1,130,442,995 ) (593,158,584 ) Non-deductible (1) 2,313,271,930 1,091,958,851 291,676,831 Production value 321,353,133 495,394,906 610,206,103 Deductible duties (21,850,672 ) (39,891,325 ) (55,005,397 ) DUC tax credit (2) (65,000,000 ) — — Deferred DUC expense 696,449 29,570,063 26,178,078 Deductions cap (80,589,774 ) (112,261,105 ) (111,906,534 ) DUC from prior years — (39 ) 14,883 Other — — 446,464 DUC-Profit-sharing Ps. 154,609,136 Ps. 372,812,500 Ps. 469,933,595 (1) For 2020, fluctuations changes are included which have no effect on the determination of the DUC. (2) Corresponds to the tax credit granted by the Mexican Government on April 21, 2020.
Summary of Income Tax Expense (Benefit)	For the years ended December 31, 2020, 2019 and 2018, Petróleos Mexicanos and its Subsidiary Companies incurred the following income tax expense (benefit): 2020 2019 2018 Current income tax Ps. 5,370,822 Ps. 4,247,998 Ps. 3,109,971 Deferred income tax 25,592,117 (33,237,009 ) (11,465,343 ) Total expense (benefit) income tax, net Ps. 30,962,939 Ps. (28,989,011 ) Ps. (8,355,372 )
Summary of Principal Factors Generating Deferred Income Tax	The principal factors generating the deferred income tax are the following: 2019 Recognized in Recognized 2020 Deferred income tax asset: Provisions Ps. 8,880,184 39,371 — 8,919,555 Employee benefits provision 68,290,356 4,451,358 (1,100,733 ) 71,640,981 Advance payments from clients 305,000 (116,717 ) — 188,283 Accrued liabilities 2,101,011 (419,649 ) — 1,681,362 Reserve due to depreciation of inventories 189,751 (189,751 ) — — Non-recoverable 709,328 (606,893 ) — 102,435 Derivative financial instruments 136,260 (94,525 ) — 41,735 Wells, pipelines, properties and equipment 8,071,570 (2,919,947 ) — 5,151,623 Tax loss carry-forwards (1) 38,427,643 (25,999,985 ) — 12,427,658 Total deferred income tax asset 127,111,103 (25,856,738 ) (1,100,733 ) 100,153,632 Deferred income tax liability: Wells, pipelines, properties, plant and equipment (1,614,704 ) 512,872 — (1,101,832 ) Other (2,062,031 ) (248,251 ) — (2,310,282 ) Total deferred income tax liability (3,676,735 ) 264,621 — (3,412,114 ) Net long-term deferred income tax asset Ps. 123,434,368 (25,592,117 ) (1,100,733 ) 96,741,518 2018 Recognized in Recognized in OCI 2019 Deferred income tax asset: Provisions Ps. 8,836,693 Ps. 43,491 Ps. — Ps. 8,880,184 Employee benefits provision 40,314,749 17,362,550 10,613,057 68,290,356 Advance payments from clients 35,807 269,193 — 305,000 Accrued liabilities 611,652 1,489,359 — 2,101,011 Reserve due to depreciation of inventories 982,228 (792,477 ) — 189,751 Non-recoverable 763,924 (54,596 ) — 709,328 Derivative financial instruments 29,674 106,586 — 136,260 Wells, pipelines, properties and equipment 11,862,776 (3,791,206 ) — 8,071,570 Tax loss carry-forwards (1) 20,659,110 17,768,533 — 38,427,643 Total deferred income tax asset 84,096,613 32,401,433 10,613,057 127,111,103 Deferred income tax liability: Wells, pipelines, properties, plant and equipment (2,630,597 ) 1,015,893 — (1,614,704 ) Other (1,881,715 ) (180,316 ) — (2,062,031 ) Total deferred income tax liability (4,512,312 ) 835,577 — (3,676,735 ) Net long-term deferred income tax asset Ps. 79,584,301 Ps. 33,237,010 Ps. 10,613,057 Ps. 123,434,368 (1) Tax loss carryforwards expire in 2030.
Summary of Expense (Benefit) Attributable to Profit (Loss) from Continuing Operations before Income Taxes	Expense attributable to the profit (loss) from continuing operations before income taxes was different from that which would result from applying the 30% rate to profit, as a result of the items listed below: For the years ended December 31, 2020 2019 2018 Expected income tax expense Ps. 28,835,256 Ps. 3,707,023 Ps. (41,316,168 ) Increase (decrease) resulting from: Tax effect of inflation-net 5,694,637 6,487,844 11,742,346 Fiscal updating of pipelines, properties and equipment (161,883 ) (5,290,734 ) (3,359,548 ) Unrecognized Deferred tax asset (1) — — 21,885,731 Cancellation of tax credits — (24,189,922 ) — Retirement benefits (8,206,693 ) (10,698,848 ) — Non-deductible 2,405,635 4,826,745 1,781,012 Others-net 2,395,987 (3,831,120 ) 911,255 Income tax expense (benefit), net Ps. 30,962,939 Ps. (28,989,012 ) Ps. (8,355,372 ) (1) Due to the fact that the circumstances to evaluate the recovery of the tax benefit from pending tax losses to be amortized in Pemex Logistics improved in 2019, a deferred asset was recognized.

Equity (Deficit) (Tables)

Equity (Deficit) (Tables)	12 Months Ended
	Dec. 31, 2020
Text block [abstract]
Summary of Certificate of Contribution "A"	PEMEX’s Certificates of Contribution “A” are as follows: Amount Certificates of Contribution “A” as of December 31, 2018 Ps. 356,544,447 Increase in Certificates of Contribution “A” during 2019 122,131,000 Certificates of Contribution “A” as of December 31, 2019 Ps. 478,675,447 Increase in Certificates of Contribution “A” during 2020 46,256,000 Certificates of Contribution “A” as of December 31, 2020 Ps. 524,931,447

Cost and Expenses by Nature (Ta

Cost and Expenses by Nature (Tables)	12 Months Ended
	Dec. 31, 2020
Text block [abstract]
Summary of Cost and Expenses by Nature	Cost and expenses by nature for each of the years ended December 31, 2020, 2019 and 2018, was as follows: 2020 2019 2018 Purchases Ps. 386,040,047 Ps. 600,657,759 Ps. 756,867,203 Depreciation of wells, pipelines, properties, plant and equipment, depreciation of rights of use and amortization of intangible assets 137,398,830 145,159,657 153,382,040 Net periodic cost of employee benefits 128,808,540 116,176,949 114,621,614 Personnel services 103,044,657 101,252,318 104,284,007 Conservation and maintenance 69,939,632 65,640,388 48,562,536 Exploration and Extraction Hydrocarbons Duty and taxes 43,593,642 67,106,181 88,145,519 Other operation costs and expenses 25,031,177 12,711,674 16,672,534 Unsuccessful wells 22 ,269,583 79,595,185 15,443,086 Raw materials and spare parts 18,381,313 22,729,422 16,850,075 Auxiliary services with third-parties 15,901,982 19,492,638 23,675,019 Other operation taxes and duties 12,180,579 12,764,473 12,248,474 Exploration expenses 6,732,689 10,942,558 13,048,078 Insurance 6,068,497 5,821,020 5,647,101 Integrated Contracts 5,275,946 9,947,983 8,015,606 Losses from fuels subtraction (1) 4,279,542 4,644,846 39,439,107 Freight 3,426,079 3,197,421 3,525,843 Inventory variations 2,572,641 1,063,678 (62,237,591 ) Total cost of sales and general expenses Ps. 990,945,376 Ps. 1,275,588,157 Ps. 1,358,190,251 (1) In accordance with Resolution RES / 179/2017, issued by the CRE, losses from fuels subtraction are losses outside the scope of the contemplated operating costs as a result of various illicit actions, including the theft of and illicit market in fuels. Pemex Logistics is responsible for distributing hydrocarbons through the pipelines and for the received products, preserving their quality and delivering them from the point of reception to the user at the point of destination. Pemex Logistics determines the volume of missing hydrocarbons through monthly calculations.

Other Revenues and Other Expe_2

Other Revenues and Other Expenses (Tables)	12 Months Ended
	Dec. 31, 2020
Text block [abstract]
Summary of Other Revenues and Other Expenses	Other revenues and expenses-net a) Other revenues 2020 2019 2018 Other Ps. 3,551,636 Ps. 3,418,551 Ps. 7,525,714 Revenues from reinsurance premiums 2,534,466 4,869,266 3,615,907 Other income for services 2,420,939 1,994,572 3,786,253 Claims recovery 1,515,295 2,687,258 3,979,698 Bidding terms, sanctions, penalties and other 1,170,632 1,503,437 630,365 Franchise fees 494,785 389,730 1,125,339 Gain on sale of fixed assets 50,215 77,633 1,850,052 Participation rights (1) 30,878 — 14,165,042 Sale of fixed assets by bidding (2) — — 3,301,653 Price of sale share — — 1,262,987 Cash distributions — — 274,621 Total other revenues Ps. 11,768,846 Ps. 14,940,447 Ps. 41,517,631 b) Other expenses 2020 2019 2018 Other Ps. (436,723 ) Ps. (4,602,210 ) Ps. (5,348,666 ) Claims (376,697 ) (173,414 ) (474,299 ) Disposal of assets (351,010 ) (2,413,776 ) (12,600,191 ) Transportation and distribution of natural gas (30,284 ) (22,291 ) (41,964 ) Total other expenses Ps. (1,194,714 ) Ps. (7,211,691 ) Ps. (18,465,120 ) (1) Relates to rights participate of EECs, for which the operators of the EECs guarantee their participation in such contracts. (2) Relates mainly to exploration and production fixed assets.

Related Parties (Tables)

Related Parties (Tables)	12 Months Ended
	Dec. 31, 2020
Text block [abstract]
Summary of Products Acquisition from Pemex Industrial Transformation	During 2020, CFE acquired the following products from Pemex Industrial Transformation: Product 2020 Heavy fuel oil Ps. 6,258,996 Industrial diesel 3,426,200 Fuel oil 456,960 Transport of Natural Gas 364,512 Other 303,278 Natural Gas 263,993 Freights 189,983 Total Ps. 11,263,922
Summary of Retirement and Former Employee Benefits Granted	Retirement , As of December 31, 2020 2019 2018 Retirement Ps. 7,233 15,549 12,403 Post-employment 354 349 782 Long-term 3,702 2,698 3,312 Ps. 11,289 18,596 16,497

Commitments (Tables)

Commitments (Tables)	12 Months Ended
	Dec. 31, 2020
Statement [LineItems]
Estimated Future Payments Under Contract	Estimated future payments under this contract for upcoming fiscal years are as follows: 2021 Ps. 4,774,522 2022 4,863,254 2023 5,008,700 2024 5,042,333 2025 5,039,959 2026 and thereafter 7,531,611 Total Ps. 32,260,379
Estimated Value of Contracts	As of December 31, 2020 and 2019, the estimated value of these contracts was as follows: Maturity 2020 2019 Up to 1 year Ps. 1,046,436 Ps. 1,251,543 1 to 3 years 1,339,040 1,610,152 4 to 5 years 376,916 426,886 Total Ps. 2,762,392 Ps. 3,288,581
Development Expenditure [member]
Statement [LineItems]
Summary of Future Payments for Lease	D. As of December 31, 2020 and 2019, the estimated value of the contracts that PEMEX has entered into with several contractors for the development of various infrastructure and services works was as follows: Maturity 2020 2019 Up to 1 year Ps. 39,162,033 Ps. 104,584,602 1 to 3 years 274,421,535 325,674,623 4 to 5 years 23,055,268 43,984,437 More than 5 years 37,518,571 147,488,082 Total Ps. 374,157,407 Ps. 621,731,744

Subsequent Events (Tables)

Subsequent Events (Tables)	12 Months Ended
	Dec. 31, 2020
Statement [LineItems]
Summary of Government Contributions to Petróleos Mexicanos through the Ministry of Energy	During 2021, the Mexican Government made the following contributions to Petróleos Mexicanos through the Ministry of Energy in order to support PEMEX’s finances: Amount January 22, 2021 (i) Ps. 12,000,000 February 11, 2021 (i) 10,000,000 February 24, 2021 (ii) 32,062,000 March 5, 2021 (i) 7,000,000 March 26, 2021 (i) 2,000,000 April 5, 2021 (i) 5,000,000 April 26, 2021 (i) 2,050,000 May 3, 2021 (i) 7,000,000 May 4, 2021 (ii) 32,062,000 Total Ps. 109,174,000 (i) Capital contributions to the construction of the Dos Bocas Refinery. (ii) Capital contributions to debt’s payments.

Subsidiary Guarantor Informat_2

Subsidiary Guarantor Information (Tables)	12 Months Ended
	Dec. 31, 2020
Text block [abstract]
Summary of Principal Amount Outstanding of Registered Debt Securities	The following table sets forth, as of December 31, 2020, the principal amount outstanding of the registered debt securities originally issued by the Master Trust. As noted above, Petróleos Mexicanos has assumed, as primary obligor, all of the obligations of the Master Trust under these debt securities. The obligations of Petróleos Mexicanos are guaranteed by the Subsidiary Guarantors: Table 1: Registered Debt Securities originally issued by the Master Trust and Assumed by Petróleos Mexicanos Security Primary Guarantors Principal amount outstanding (U.S. $) 6.625% Guaranteed Bonds due 2035 Petróleos Mexicanos Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics 2,749,000 6.625% Guaranteed Bonds due 2038 Petróleos Mexicanos Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics 491,175 8.625% Bonds due 2022 Petróleos Mexicanos Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics 89,609 8.625% Guaranteed Bonds due 2023 Petróleos Mexicanos Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics 63,705 9.50% Guaranteed Bonds due 2027 Petróleos Mexicanos Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics 219,217 The following table sets forth, as of December 31, 2020, the principal amount outstanding of the registered debt securities issued by Petróleos Mexicanos, and guaranteed by Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics. Table 2: Registered Debt Securities originally issued by Petróleos Mexicanos Security Issuer Guarantors Principal amount Floating Rate Notes due 2022 Petróleos Mexicanos Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics 500,448 9.50% Global Guaranteed Bonds Petróleos Mexicanos Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics 102,149 5.50% Notes due 2021 Petróleos Mexicanos Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics 806,540 3.500% Notes due 2023 Petróleos Mexicanos Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics 1,143,938 4.875% Notes due 2024 Petróleos Mexicanos Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics 1,031,954 6.625% Notes due 2035 Petróleos Mexicanos Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics 2,749,000 6.500% Bonds due 2041 Petróleos Mexicanos Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics 1,560,521 4.875% Notes due 2022 Petróleos Mexicanos Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics 639,371 5.375% Notes due 2022 Petróleos Mexicanos Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics 447,340 5.50% Bonds due 2044 Petróleos Mexicanos Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics 793,638 6.375% Bonds due en 2045 Petróleos Mexicanos Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics 1,560,461 5.625% Bonds due 2046 Petróleos Mexicanos Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics 947,279 4.500% Notes due 2026 Petróleos Mexicanos Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics 1,386,032 4.250% Notes due 2025 Petróleos Mexicanos Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics 790,153 6.375% Notes due 2021 Petróleos Mexicanos Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics 192,826 6.875% Notes due 2026 Petróleos Mexicanos Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics 2,970,334 4.625% Notes due 2023 Petróleos Mexicanos Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics 895,444 6.750% Bonds due 2047 Petróleos Mexicanos Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics 5,997,558 5.350% Notes due 2028 Petróleos Mexicanos Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics 2,482,468 6.350% Bonds due 2048 Petróleos Mexicanos Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics 2,882,540 6.500% Notes due 2027 Petróleos Mexicanos Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics 5,478,577 5.950% Notes due 2031 Petróleos Mexicanos Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics 3,777,381 6.490% Notes due 2027 Petróleos Mexicanos Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics 2,341,377 6.840% Notes due 2030 Petróleos Mexicanos Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics 4,387,135 6.950% Bonds due 2060 Petróleos Mexicanos Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics 3,796,812 7.690% Bonds due 2050 Petróleos Mexicanos Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics 8,047,831 6.500% Notes due 2029 Petróleos Mexicanos Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics 1,986,963
Supplemental Statement of Financial Position	SUPPLEMENTAL CONDENSED CONSOLIDATING FINANCIAL INFORMATION STATEMENT OF FINANCIAL POSITION As of December 31, 2020 Petróleos Mexicanos Subsidiary guarantors Non-guarantor subsidiaries Eliminations PEMEX Assets Current assets Cash and cash equivalents Ps. 9,394,220 Ps. 4,970,074 Ps. 25,625,487 Ps. — Ps. 39,989,781 Trade and other accounts receivable, derivative financial instruments and other current assets 46,962,377 139,800,991 50,500,929 — 237,264,297 Accounts receivable—inter-company 800,429,251 1,061,537,492 131,931,674 (1,993,898,417 ) — Inventories 889,543 41,946,007 9,770,111 — 52,605,661 Total current assets 857,675,391 1,248,254,564 217,828,201 (1,993,898,417 ) 329,859,739 Long-term receivables—intercompany 1,824,398,719 — 988,069 (1,825,386,788 ) — Investments in joint ventures and associates (1,358,455,811 ) 45,295,025 75,662,389 1,249,513,526 12,015,129 Wells, pipelines, properties, plant and equipment-net 8,548,022 1,209,708,979 57,872,520 — 1,276,129,521 Long-term notes receivables 1,999 884,828 — — 886,827 Right of use 759,133 56,949,499 1,486,625 — 59,195,257 Deferred taxes 59,277,027 45,431,025 3,821,147 — 108,529,199 Intangible assets 25,650 21,639,537 1,110,597 — 22,775,784 Mexican Government Bonds 111,512,962 — — — 111,512,962 Other assets — 780,426 6,803,084 — 7,583,510 Total assets 1,503,743,092 2,628,943,883 365,572,632 (2,569,771,679 ) 1,928,487,928 Liabilities Current liabilities Current portion of long-term debt 334,770,935 6,642,039 49,684,293 — 391,097,267 Accounts payable—inter-company 1,360,720,755 552,292,445 78,413,852 (1,991,427,052 ) — Other current liabilities 18,629,284 325,647,266 37,036,254 — 381,312,804 Total current liabilities 1,714,120,974 884,581,750 165,134,399 (1,991,427,052 ) 772,410,071 Long-term debt 1,825,964,253 27,513,661 14,152,136 — 1,867,630,050 Long-term payables—inter-company — 1,825,630,931 2,227,221 (1,827,858,152 ) — Employee benefits, provisions for sundry creditors, other liabilities and deferred taxes 368,754,587 1,315,022,188 9,398,062 — 1,693,174,837 Total liabilities 3,908,839,814 4,052,748,530 190,911,818 (3,819,285,204 ) 4,333,214,958 Equity (deficit), net (2,405,096,722 ) (1,423,804,647 ) 174,660,814 1,249,513,525 (2,404,727,030 ) Total liabilities and equity Ps.1,503,743,092 Ps.2,628,943,883 Ps.365,572,632 Ps.(2,569,771,679 ) Ps.1,928,487,928 SUPPLEMENTAL CONDENSED CONSOLIDATING FINANCIAL INFORMATION STATEMENT OF FINANCIAL POSITION As of December 31, 2019 Petróleos Mexicanos Subsidiary guarantors Non-guarantor subsidiaries Eliminations PEMEX Assets Current assets Cash and cash equivalents Ps. 28,234,857 Ps. 4,826,057 Ps. 27,560,717 Ps. — Ps. 60,621,631 Trade and other accounts receivable, derivative financial instruments and other current assets 21,286,590 121,770,414 56,684,210 — 199,741,214 Accounts receivable—inter-company 592,503,940 1,134,820,799 129,911,984 (1,857,236,723 ) — Inventories 459,131 51,833,240 30,379,825 — 82,672,196 Total current assets 642,484,518 1,313,250,510 244,536,736 (1,857,236,723 ) 343,035,041 Long-term receivables—intercompany 1,692,840,909 — 1,615,441 (1,694,456,350 ) — Investments in joint ventures and associates (980,054,315 ) 10,757,092 73,151,606 911,020,196 14,874,579 Wells, pipelines, properties, plant and equipment-net 9,706,301 1,234,911,644 32,930,617 — 1,277,548,562 Long-term notes receivables 121,626,851 938,455 — — 122,565,306 Right of use 1,385,617 67,564,544 1,868,153 — 70,818,314 Deferred taxes 81,127,820 50,735,224 4,303,703 — 136,166,747 Intangible assets 130,535 13,018,022 1,435,967 — 14,584,524 Other assets — 564,971 4,089,036 — 4,654,007 Total assets 1,569,248,236 2,691,740,462 363,931,259 (2,640,672,877 ) 1,984,247,080 Liabilities Current liabilities Current portion of long-term debt 209,291,307 2,942,757 32,690,121 — 244,924,185 Accounts payable—inter-company 1,275,967,793 471,706,488 106,934,283 (1,854,608,564 ) — Other current liabilities 23,694,401 230,345,159 53,239,883 — 307,279,443 Total current liabilities 1,508,953,501 704,994,404 192,864,287 (1,854,608,564 ) 552,203,628 Long-term debt 1,694,319,842 28,300,551 15,629,510 — 1,738,249,903 Long-term payables—inter-company — 1,694,801,416 2,283,093 (1,697,084,509 ) — Employee benefits, provisions for sundry creditors, other liabilities and deferred taxes 363,041,463 1,247,581,410 14,579,978 — 1,625,202,851 Total liabilities 3,566,314,806 3,675,677,781 225,356,868 (3,551,693,073 ) 3,915,656,382 Equity (deficit), net (1,997,066,570 ) (983,937,319 ) 138,574,391 911,020,196 (1,931,409,302 ) Total liabilities and equity Ps. 1,569,248,236 Ps. 2,691,740,462 Ps. 363,931,259 Ps. (2,640,672,877) Ps. 1,984,247,080
Supplemental Statement of Comprehensive Income	SUPPLEMENTAL CONDENSED CONSOLIDATING FINANCIAL INFORMATION STATEMENT OF COMPREHENSIVE INCOME For the year ended December 31, 2020 Petróleos Mexicanos Subsidiary Non-guarantor Eliminations PEMEX consolidated Net sales — 1,115,845,485 459,202,040 (626,101,165 ) 948,946,360 Services income 78,461,654 88,034,087 12,253,482 (174,033,739 ) 4,715,484 Total sales revenues 78,461,654 1,203,879,572 471,455,522 (800,134,904 ) 953,661,844 (Impairment) of wells, pipelines, properties, plant and equipment — (36,303,470 ) (50,230 ) — (36,353,700 ) Cost of sales 982,896 1,090,745,812 460,296,695 (719,410,713 ) 832,614,690 Gross income 77,478,758 76,830,290 11,108,597 (80,724,191 ) 84,693,454 Other revenues (expenses), net 170,887 5,733,633 4,635,082 34,530 10,574,132 Total general expenses 75,817,961 154,020,378 9,198,761 (80,706,414 ) 158,330,686 Operating income 1,831,684 (71,456,455 ) 6,544,918 16,753 (63,063,100 ) Financing cost, net (54,710,062 ) (70,134,087 ) (3,066,150 ) (16,754 ) (127,927,053 ) Foreign exchange income, net (1,778,917 ) (125,864,355 ) (1,306,032 ) — (128,949,304 ) Profit (loss) sharing in joint ventures and associates (433,417,288 ) 1,288,687 (12,588,491 ) 441,176,559 (3,540,533 ) (Loss) income before taxes, duties and other (488,074,583 ) (266,166,210 ) (10,415,755 ) 441,176,558 (323,479,990 ) Total taxes, duties and other 20,804,230 159,451,307 5,316,538 — 185,572,075 Net (loss) income for the year (508,878,813 ) (425,617,517 ) (15,732,293 ) 441,176,558 (509,052,065 ) Total other comprehensive result (6,062,096 ) (12,844,301 ) 7,600,985 — (11,305,412 ) Total comprehensive result for the year (514,940,909 ) (438,461,818 ) (8,131,308 ) 441,176,558 (520,357,477 ) SUPPLEMENTAL CONDENSED CONSOLIDATING FINANCIAL INFORMATION STATEMENT OF COMPREHENSIVE INCOME For the year ended December 31, 2019 Petróleos Mexicanos Subsidiary guarantors Non-guarantor subsidiaries Eliminations PEMEX consolidated Net sales Ps. — Ps. 1,623,118,346 Ps. 712,266,064 Ps. (942,521,905 ) Ps. 1,392,862,505 Services income 59,915,165 131,935,732 9,683,190 (192,425,407 ) 9,108,680 Total sales revenues 59,915,165 1,755,054,078 721,949,254 (1,134,947,312 ) 1,401,971,185 (Impairment) of wells, pipelines, properties, plant and equipment — (27,672,704 ) (3,610,450 ) — (31,283,154 ) Cost of sales 989,308 1,488,250,706 705,101,991 (1,071,408,581 ) 1,122,933,424 Gross income 58,925,857 239,130,668 13,236,813 (63,538,731 ) 247,754,607 Other revenues (expenses), net 139,412 3,048,907 4,616,272 (75,835 ) 7,728,756 Total general expenses 62,645,185 141,628,000 11,974,223 (63,592,675 ) 152,654,733 Operating income (3,579,916 ) 100,551,575 5,878,862 (21,891 ) 102,828,630 Financing cost, net (66,593,657 ) (57,364,522 ) (2,953,372 ) 21,891 (126,889,660 ) Foreign exchange income, net 3,912,176 82,143,830 874,382 — 86,930,388 Profit (loss) sharing in joint ventures and associates (292,585,923 ) 116,536 (4,297,609 ) 295,609,103 (1,157,893 ) (loss) income before taxes, duties and other (358,847,320 ) 125,447,419 (497,737 ) 295,609,103 61,711,465 Total taxes, duties and other (11,557,958 ) 352,239,318 3,142,129 — 343,823,489 Net (loss) income for the year (347,289,362 ) (226,791,899 ) (3,639,866 ) 295,609,103 (282,112,024 ) Total other comprehensive result (55,495,859 ) (253,482,329 ) (375,252 ) (2,669,406 ) (312,022,846 ) Total comprehensive result for the year Ps. (402,785,221 ) Ps. (480,274,228 ) Ps. (4,015,118 ) Ps. 292,939,697 Ps. (594,134,870 ) SUPPLEMENTAL CONDENSED CONSOLIDATING FINANCIAL INFORMATION STATEMENT OF COMPREHENSIVE INCOME For the year ended December 31, 2018 Petróleos Mexicanos Subsidiary guarantors Non-guarantor subsidiaries Eliminations PEMEX consolidated Net sales Ps. — Ps. 1,941,467,663 Ps. 912,726,857 Ps. (1,181,748,372 ) Ps. 1,672,446,148 Services income 75,979,835 113,113,024 5,960,807 (186,380,664 ) 8,673,002 Total sales revenues 75,979,835 2,054,580,687 918,687,664 (1,368,129,036 ) 1,681,119,150 Reversal (impairment) of wells, pipelines, properties, plant and equipment — 25,384,888 (3,965,891 ) — 21,418,997 Cost of sales 1,905,865 1,536,120,030 910,525,715 (1,249,040,049 ) 1,199,511,561 Gross income 74,073,970 543,845,545 4,196,058 (119,088,987 ) 503,026,586 Other revenues (expenses), net 73,183 (26,020,067 ) 8,710,216 40,289,179 23,052,511 Total general expenses 69,479,218 158,965,537 10,248,039 (80,014,104 ) 158,678,690 Operating income 4,667,935 358,859,941 2,658,235 1,214,296 367,400,407 Financing cost, net (64,226,376 ) (46,203,154 ) (475,599 ) (523,384 ) (111,428,513 ) Foreign exchange income, net (3,832,933 ) 26,526,563 965,850 — 23,659,480 Profit (loss) sharing in joint ventures and associates (125,246,527 ) 53,058 2,164,868 124,555,613 1,527,012 Income (loss) before taxes, duties and other (188,637,901 ) 339,236,408 5,313,354 125,246,525 281,158,386 Total taxes, duties and other (8,272,851 ) 466,788,123 3,062,951 — 461,578,223 Net (loss) income for the year (180,365,050 ) (127,551,715 ) 2,250,403 125,246,525 (180,419,837 ) Total other comprehensive result 47,357,316 176,174,564 (140,133 ) — 223,391,747 Total comprehensive result for the year Ps. (133,007,734 ) Ps. 48,622,849 Ps. 2,110,270 Ps. 125,246,525 Ps. 42,971,910
Supplemental Statement of Cash Flows	SUPPLEMENTAL CONDENSED CONSOLIDATING FINANCIAL INFORMATION STATEMENT OF CASH FLOWS For the year ended December 31, 2020 Petróleos Subsidiary Non-guarantor Eliminations PEMEX Operating activities: Net (loss) income for the year (508,878,813 ) (425,617,517 ) (15,507,766 ) 440,952,031 (509,052,065 ) Income tax and duties 20,804,230 159,451,307 5,316,538 — 185,572,075 Depreciation and amortization 1,066,176 126,778,686 1,786,958 — 129,631,820 Amortization of intangible assets 453,081 (30,155 ) 56,062 — 478,988 Impairment of wells, pipelines, properties, plant and equipment — 36,303,471 50,229 — 36,353,700 Capitalized unsuccesful wells — 10,947,702 — — 10,947,702 Unsuccesful wells from intangible assets — 8,404,284 — — 8,404,284 Disposal of wells, pipelines, properties, 94,065 3,004,053 2,199,444 — 5,297,562 Disposal of intangible asset 396,118 396,118 Amortization of rights of use 644,838 5,453,688 1,130,705 — 7,229,231 Cancellation of rights of use — (1,101,987 ) — — (1,101,987 ) Gain on sale of subsidiary entity — — (707,533 ) — (707,533 ) Effects of net present value of reserve for well abandonment — 4,555,692 — — 4,555,692 Profit (loss) sharing in investments 441,125,283 (41,685 ) 3,582,218 (441,125,283 ) 3,540,533 Unrealized foreign exchange loss (gain) 117,158,102 12,040,638 3,267,503 — 132,466,243 Interest expense 134,335,289 25,908,927 1,521,026 — 161,765,242 Interest income (11,617,299 ) (5,124,749 ) — — (16,742,048 ) Funds (used in) from operating activities: Taxes 1,349,021 (155,315,035 ) (3,725,449 ) — (157,691,463 ) Accounts receivable, accounts payable, derivative financial instruments and accrued liabilities (16,644,218 ) (692,255 ) 22,115,695 — 4,779,222 Employee benefits (355,666 ) 64,873,037 (5,347,025 ) — 59,170,346 Inter-company charges and deductions (147,308,477 ) 37,878,271 35,319,045 74,111,161 — Cash flows (used in) from operating activities 32,225,612 (92,323,627 ) 51,453,768 73,937,909 65,293,662 Investing activities: Acquisition of wells, pipelines, properties, plant (349,555 ) (97,841,648 ) (40,426,953 ) — (138,618,156 ) Other assets and other receivables 930,596 (812,028 ) (2,640,055 ) — (2,521,487 ) (Increase) decrease due to Inter-company investing (194,281,597 ) — 627,372 193,654,225 — Cash flows used in investing activities (193,700,556 ) (98,653,676 ) (42,439,636 ) 193,654,225 (141,139,643 ) Financing activities: Increase in equity due to Certificates of Contribution “A” 46,256,000 — — — 46,256,000 Long-terms and interest received from the Mexican Government 5,800,940 — — — 5,800,940 Lease payments of principal and interest (396,917 ) (8,266,969 ) (1,346,915 ) — (10,010,801 ) Loans obtained from financial institutions 730,222,863 1,046 557,905,959 — 1,288,129,868 Debt payments, principal only (601,448,338 ) (4,828,154 ) (545,685,655 ) — (1,151,962,147 ) Interest paid (122,553,204 ) (7,200,077 ) (1,235,869 ) — (130,989,150 ) Inter-company increase (decrease) financing 84,752,963 211,415,474 (28,576,303 ) (267,592,134 ) — Cash flows provided by financing activities: 142,634,307 191,121,320 (18,938,783 ) (267,592,134 ) 47,224,710 Net (decrease) increase in cash and cash equivalents (18,840,637 ) 144,017 (9,924,651 ) — (28,621,271 ) Effects of change in cash value — — 7,989,421 — 7,989,421 Cash and cash equivalents at the beginning of the year 28,234,857 4,826,057 27,560,717 — 60,621,631 Cash and cash equivalents at the end of the year 9,394,220 4,970,074 25,625,487 — 39,989,781 SUPPLEMENTAL CONDENSED CONSOLIDATING FINANCIAL INFORMATION STATEMENT OF CASH FLOWS For the year ended December 31, 2019 Petróleos Subsidiary Non-guarantor Eliminations PEMEX Operating activities: Net (loss) income for the year Ps. (347,289,363 ) Ps. (225,457,279 ) Ps. (4,974,486 ) Ps. 295,609,104 Ps. (282,112,024 ) Income tax and duties (11,557,958 ) 352,291,238 3,090,209 — 343,823,489 Depreciation and amortization 1,183,741 134,134,135 1,869,134 — 137,187,010 Amortization of intangible assets 373,961 86,342 83,069 — 543,372 Impairment of wells, pipelines, properties, plant and equipment — 27,672,705 3,610,449 — 31,283,154 Capitalized unsuccesful wells — 71,604,308 — — 71,604,308 Unsuccesful wells from intangible assets — 7,990,877 — — 7,990,877 Disposal of wells, pipelines, properties, plant and equipment 14,115 1,492,916 1,034,527 — 2,541,558 Amortization of rights of use 639,877 5,439,642 1,349,756 — 7,429,275 Effects of net present value of reserve for well abandonment — (258,816 ) — — (258,816 ) Profit (loss) sharing in investments 296,230,824 (538,281 ) (1,473,955 ) (293,060,695 ) 1,157,893 Unrealized foreign exchange loss (gain) (74,439,514 ) (2,867,091 ) (938,369 ) — (78,244,974 ) Interest expense 118,543,971 12,446,222 1,871,147 — 132,861,340 Interest income (22,964,784 ) (5,410,645 ) (860,174 ) — (29,235,603 ) Funds (used in) from operating activities: Accounts receivable, accounts payable, derivative financial instruments and accrued liabilities 11,279,402 32,413,620 675,345 — 44,368,367 Taxes (10,682,007 ) (356,254,147 ) (5,737,259 ) — (372,673,413 ) Employee benefits 52,052,212 9,322,327 5,580,162 — 66,954,701 Inter-company charges and deductions (439,039,267 ) 176,676,691 5,349,241 257,013,335 — Cash flows (used in) from operating activities (425,654,790 ) 240,784,764 10,528,796 259,561,744 85,220,514 Investing activities: Acquisition of wells, pipelines, properties, plant and equipment and intangible assets (232,592 ) (132,206,201 ) 5,564,862 — (126,873,931 ) Other assets and other receivables 14,743,694 933,269 (101,835 ) — 15,575,128 (Increase) decrease due to Inter-company investing 401,422,502 — — (401,422,502 ) — Cash flows used in investing activities 415,933,604 (131,272,932 ) 5,463,027 (401,422,502 ) (111,298,803 ) Financing activities: Increase in equity due to Certificates of Contribution “A” 122,131,000 41,956,917 (41,956,917 ) — 122,131,000 Long-terms and interest received from the Mexican Government 38,704,883 — — — 38,704,883 Lease payments (588,463 ) (8,745,025 ) (1,375,933 ) — (10,709,421 ) Loans obtained from financial institutions 824,049,426 46,297 343,739,223 — 1,167,834,946 Debt payments, principal only (851,077,341 ) (4,826,936 ) (329,138,006 ) — (1,185,042,283 ) Interest paid (120,450,950 ) (6,104,160 ) (1,390,093 ) — (127,945,203 ) Inter-company increase (decrease) financing — (143,484,166 ) 1,623,408 141,860,758 — Cash flows provided by financing activities: 12,768,555 (121,157,073 ) (28,498,318 ) 141,860,758 4,973,922 Net (decrease) increase in cash and cash equivalents 3,047,369 (11,645,241 ) (12,506,495 ) — (21,104,367 ) Effects of change in cash value — — (186,411 ) — (186,411 ) Cash and cash equivalents at the beginning of the year 25,187,488 16,471,298 40,253,623 — 81,912,409 Cash and cash equivalents at the end of the year Ps. 28,234,857 Ps. 4,826,057 Ps. 27,560,717 Ps. — Ps. 60,621,631 SUPPLEMENTAL CONDENSED CONSOLIDATING FINANCIAL INFORMATION STATEMENT OF CASH FLOWS For the year ended December 31, 2018 Petróleos Subsidiary Non-guarantor Eliminations PEMEX consolidated Operating activities: Net (loss) income for the year Ps. (180,365,050 ) Ps. (127,551,718 ) Ps. 2,305,189 Ps. 125,191,742 Ps. (180,419,837 ) Adjustments to reconcile net loss to cash provided by operating activities: Depreciation and amortization 1,274,179 149,747,232 2,360,629 — 153,382,040 Amortization of intangible assets 2,446,445 86,332 110,549 — 2,643,326 Impairment of wells, pipelines, properties, plant and equipment — (25,384,888 ) 3,965,891 — (21,418,997 ) Capitalized unsuccesful wells — 15,443,086 — — 15,443,086 Unsuccesful wells from intangible assets — (2,171,218 ) — — (2,171,218 ) Disposal of wells, pipelines, properties, plant and equipment 872,527 12,226,128 3,786,609 — 16,885,264 Gain on sale of share in joint ventures and associates — (10,257 ) (690,914 ) — (701,171 ) Effects of net present value of reserve for well abandonment — (6,953,200 ) — — (6,953,200 ) Profit (loss) sharing in investments 125,246,527 (538,281 ) (1,473,955 ) (124,761,303 ) (1,527,012 ) Unrealized foreign exchange loss (gain) (19,726,271 ) 446,523 (482,460 ) — (19,762,208 ) Interest expense 109,697,028 12,720,032 1,452,624 — 123,869,684 Interest income (9,520,962 ) — — — (9,520,962 ) Funds (used in) from operating activities: Accounts receivable, accounts payable, derivative financial instruments and accrued liabilities 51,460,407 (73,421,161 ) 26,118,293 — 4,157,539 Taxes (8,881,300 ) 38,071,896 (157,861 ) — 29,032,735 Other assets and other liabilities 559,449 (12,071,857 ) (3,244,955 ) — (14,757,363 ) Employee benefits 10,519,603 44,858,697 (1,773,416 ) — 53,604,884 Inter-company charges and deductions (14,527,177 ) 81,240,429 (21,516,287 ) (45,196,965 ) — Cash flows (used in) from operating activities 69,055,405 106,737,775 10,759,936 (44,766,526 ) 141,786,590 Investing activities: Acquisition of wells, pipelines, properties, plant and equipment and intangible assets (1,162,685 ) (103,408,759 ) (4,389,245 ) — (108,960,689 ) Proceeds from sale of assets — 14,568 4,063,776 — 4,078,344 Other assets 3,586,010 212,421 — — 3,798,431 (Increase) decrease due to Inter-company investing (47,454,385 ) — — 47,454,385 — Cash flows used in investing activities (45,031,060 ) (103,181,770 ) (325,469 ) 47,454,385 (101,083,914 ) Financing activities: Loans obtained from financial institutions 510,871,366 — 388,897,646 — 899,769,012 Debt payments, principal only (450,353,531 ) (6,662,318 ) (384,017,543 ) — (841,033,392 ) Interest paid (106,313,795 ) (7,857,926 ) (1,117,668 ) — (115,289,389 ) Inter-company increase (decrease) financing — 8,620,192 (5,932,333 ) (2,687,859 ) — Cash flows provided by financing activities: (45,795,960 ) (5,900,052 ) (2,169,898 ) (2,687,859 ) (56,553,769 ) Net (decrease) increase in cash and cash equivalents (21,771,615 ) (2,344,047 ) 8,264,569 — (15,851,093 ) Effects of change in cash value — — (88,252 ) — (88,252 ) Cash and cash equivalents at the beginning of the year 46,959,103 18,815,345 32,077,306 — 97,851,754 Cash and cash equivalents at the end of the year Ps. 25,187,488 Ps. 16,471,298 Ps. 40,253,623 Ps. — Ps. 81,912,409

Supplementary Information on _2

Supplementary Information on Oil and Gas Exploration And Production Activities (Unaudited) (Tables)	12 Months Ended
	Dec. 31, 2020
Text block [abstract]
Summary of Capitalized Costs for Oil and Gas Producing Activities	A. Capitalized costs for oil and gas producing activities (unaudited): 2020 2019 2018 Proved Properties Ps. 2,483,134,177 2,306,255,209 2,505,307,260 Construction in progress 64,911,619 50,951,279 51,033,968 Accumulated depreciation and amortization (1,775,163,736 ) (1,675,843,298 ) (1,572,649,381 ) Net capitalized costs Ps. 772,882,060 681,363,190 983,691,847
Summary of Costs Incurred for Oil and Gas Property Exploration and Development Activities	B. Costs incurred for oil and gas property exploration and development activities (unaudited): 2020 2019 Exploration Ps. 33,986,110 31,222,023 Development 97,041,516 82,135,240 Total costs incurred Ps. 131,027,626 113,357,263
Summary of Results of Operations for Oil and Gas Producing Activities	C. Results of operations for oil and gas producing activities (unaudited): 2020 2019 2018 Revenues from sale of oil and gas Ps. 558,051,547 762,102,939 910,433,244 Hydrocarbon duties 154,609,136 343,242,436 443,491,451 Production costs (excluding taxes) 257,571,641 275,090,795 273,695,691 Other costs and expenses (7,024,695 ) (6,910,321 ) (10,109,114 ) Exploration expenses 31,868,857 90,258,519 30,953,413 Depreciation, depletion, amortization and accretion 845,380 222,651,461 28,845,604 437,870,319 924,332,890 766,877,047 Results of operations for oil and gas producing activities Ps. 120,181,228 (162,229,951 ) 143,556,198
Summary of Results of Operations for Oil and Gas Producing Activities	D. Sales prices (unaudited) The following table summarizes average sales prices in U.S. dollars for each of the years ended December 31 (excluding production taxes): Description 2020 2019 2018 Weighted average sales price per barrel of oil equivalent (boe) (1) U.S. $ 27.86 U.S. $ 43.52 U.S. $ 50.89 Crude oil, per barrel 35.47 57.13 62.99 Natural gas, per thousand cubic feet 2.54 3.55 5.57 (1) To convert dry gas to barrels of oil equivalent, a factor of 5.201 thousand cubic feet of dry gas per barrel of oil equivalent is used.
Summary of Oil and Gas Proved Reserves	Summary of oil and gas (1) based on average fiscal year prices Crude oil and (2) Dry Gas (3) (in millions of barrels) (in billions of cubic feet) Proved developed and un-developed Proved developed reserves 3,603.4 3,922.3 Proved undeveloped reserves 2,437.6 3,061.9 Total proved reserves 6,041.0 6,984.2 Note: Numbers may not total due to rounding. (1) PEMEX does not currently produce synthetic oil or synthetic gas, or other natural resources from which synthetic oil or synthetic gas can be produced. (2) Crude oil and condensate reserves include the fraction of liquefiable hydrocarbons recoverable in natural gas processing plants located at fields. (3) Reserve volumes reported in this table are volumes of dry gas, although natural gas production reported in other tables refers to sour wet gas. There is a shrinkage in volume when natural gas liquids and impurities are extracted to obtain dry gas. Therefore, reported natural gas volumes are greater than dry gas volumes.
Disclosure of Proved Developed and Undeveloped Reserve	Crude oil and condensate reserves (including natural gas liquids) (1) 2020 2019 2018 (in millions of barrels) Proved developed and undeveloped reserves: At December 31 5,961 5,786 6,427 Revisions (2) 651 784 22 Extensions and discoveries 97 78 140 Production (695 ) (687 ) (744 ) Farm-outs and transfers to E&P contracts (CEE) and transfers of fields due to CNH bidding process 27 — (59 ) At December 31 6,041 5,961 5,786 Proved developed reserves at December 31 3,603 3,585 3,588 Proved undeveloped reserves at December 31 2,438 2,376 2,198 Note: Numbers may not total due to rounding. (1) Crude oil and condensate reserves include the fraction of liquefiable hydrocarbons recoverable in natural gas processing plants located at fields. (2) Revisions include positive and negative changes due to new data from well drilling, revisions made when actual reservoir performance differs from expected performance and changes in hydrocarbon prices. Source: Pemex Exploration and Production. Dry gas reserves 2020 2019 2018 (in billions of cubic feet) Proved developed and undeveloped reserves: At December 31 6,352 6,370 6,593 Revisions (1) 1,240 656 3 Extensions and discoveries 176 196 809 Production (2) (819 ) (870 ) (887 ) Farm outs and transfer to E&P contracts (CEE) and transfers of fields due to CNH bidding process 35 — (148 ) At December 31 6,984 6,352 6,370 Proved developed reserves at December 31 3,922 3,609 3,380 Proved undeveloped reserves at December 31 3,062 2,743 2,990 Note: Numbers may not total due to rounding. (1) Revisions include positive and negative changes due to new data from well drilling, revisions made when actual reservoir performance differs from expected performance and changes in hydrocarbon prices. (2) Production refers here to dry gas, although natural gas production reported in other tables refers to sour wet gas. There is a shrinkage in volume when natural gas liquids and impurities are extracted to obtain dry gas. Therefore, reported natural gas volumes are greater than dry gas volumes.
Disclosure of standardized measure of discounted future net cash flows	Standardized measure of discounted future net cash flows as of December 31 2020 2019 2018 (in millions of U.S. dollars) Future cash inflows 201,777 330,286 321,065 Future production costs (excluding profit taxes) (109,064 ) (114,782 ) (103,498 ) Future development costs (23,631 ) (37,540 ) (22,224 ) Future cash flows before tax 69,082 177,964 195,343 Future production and excess gains taxes (73,122 ) (134,174 ) (156,691 ) Future net cash flows (4,040 ) 43,790 38,652 Effect of discounting net cash flows by 10% 3,359 (18,807 ) (12,434 ) Standardized measure of discounted future net cash flows (681 ) 24,983 26,218
Disclosure of Changes in Standardized Measure of Discounted Future Net Cash Flows	Changes in standardized measure of discounted future net cash flows 2020 2019 2018 (in millions of U.S. dollars) Sales of oil and gas produced, net of production costs (16,968 ) (29,530 ) (31,279 ) Net changes in prices and production costs (39,509 ) 73,278 62,902 Extensions and discoveries 1,426 1,658 4,323 Development cost incurred during the year 4,654 4,281 2,984 Changes in estimated development costs (10,019 ) 3,341 (2,146 ) Reserves revisions and timing changes 5,808 (19,615 ) 1,511 Accretion of discount of pre-tax 5,929 (9,305 ) 6,628 Net changes in production and excess gains taxes 23,015 (25,343 ) (22,818 ) Aggregate change in standardized measure of discounted future net cash flows (25,664 ) (1,235 ) 22,105 2020 2019 2018 (in millions of U.S. dollars) Standardized measure: As of January 1 24,983 26,218 4,113 As of December 31 (681 ) 24,983 26,218 Change (25,664 ) (1,235 ) 22,105

Authorization And Basis Of Pr_2

Authorization And Basis Of Preparation - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	May 11, 2021Exchange_Rate
Disclosure Of Basis Of Preparation [Line Items]
Employee benefits provision	35.00%	37.00%
Exchange rate for the settlement of obligation	19.9487		19.9223
U.S [member]
Disclosure Of Basis Of Preparation [Line Items]
Exchange rate for the settlement of obligation	19.9487	18.8452

Accounting Changes Split Adjust

Accounting Changes Split Adjustments Reclassifications and Corrections of Non-Material Errors - Summary of Impact on Transition to IFRS 16 (Detail) $ in Thousands, $ in Thousands	Dec. 31, 2020USD ($)	Dec. 31, 2020MXN ($)	Dec. 31, 2019MXN ($)	Jan. 01, 2019MXN ($)	Dec. 31, 2018MXN ($)
Disclosure of significant accounting policies [line items]
Right of use assets	$ 2,967,374	$ 59,195,257	$ 70,818,314		$ 72,760,580
Lease liability		$ 63,184,128	$ 68,148,627		$ 70,651,797
IFRS 16 [member]
Disclosure of significant accounting policies [line items]
Right of use assets				$ 72,760,580
Lease liability				$ 70,651,797

Accounting Changes Split Adju_2

Accounting Changes Split Adjustments Reclassifications and Corrections of Non-Material Errors - Summary of Measuring Lease Liabilities for Leases (Detail) - MXN ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Recognition exemption for:
Lease liabilities recognized at January 1, 2019	$ 63,184,128	$ 68,148,627		$ 70,651,797
IFRS 16 [member]
Disclosure of expected impact of initial application of new standards or interpretations [line items]
Operating lease commitment at December 31, 2018			$ 62,723,909
Undisclosed leases in 2018 Financial statements			40,186,551
Operating lease commitment			102,910,460
Operating lease commitment discounted using the incremental borrowing rate at January 1, 2019			65,608,174
Lease liabilities from financial leases previously recognized up to December 31, 2018			6,053,280
Recognition exemption for:
Short-term leases			(1,009,657)
Lease liabilities recognized at January 1, 2019			$ 70,651,797

Accounting Changes Splits Adj_3

Accounting Changes Splits Adjustments Reclassifications and Corrections of Non-Material Errors - Additional Information (Detail) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jan. 01, 2019
Disclosure of transactions between related parties [line items]
Leases maturity term	20 years
Leases extenstion period	5 years
Incremental borrowing rate that used to discount lease payments				7.70%
Impairment loss	$ 103,736,696	$ 139,056,243	$ 121,295,334
Wells And Pipelines Of Plant And Equipment [member]
Disclosure of transactions between related parties [line items]
Impairment loss		$ 65,799,060

Accounting Changes Splits Adj_4

Accounting Changes Splits Adjustments Reclassifications and Corrections of Non-Material Errors - Summary of Consolidated Statement of Financial Position (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)	Dec. 31, 2020MXN ($)	Dec. 31, 2019MXN ($)	Dec. 31, 2018MXN ($)	Dec. 31, 2020MXN ($)	Dec. 31, 2017MXN ($)
Condensed Balance Sheet Statements, Captions [Line Items]
Other accounts receivable	$ 1,584,846		$ 31,416,091		$ 31,615,623
Other financing receivables			31,416,091		31,615,623
Other non-financing receivables			940,454		886,827
Other current assets	175,063		2,829,233		3,492,283
Total current assets	16,535,400		343,035,041		329,859,739
Wells, pipelines, properties, plant and equipment, net	63,970,561		1,277,548,562		1,276,129,521
Other assets	380,151		4,654,007		7,583,510
Total non-current assets	80,136,961		1,641,212,039		1,598,628,189
Accumulated deficit from prior years	(111,014,607)		(1,933,106,785)		(2,214,597,087)
Net loss for the year	(25,518,054)	$ (509,052,065)	(282,112,024)	$ (180,419,837)
Total equity (deficit)	$ (120,545,552)		(1,931,409,302)	(1,459,405,432)	$ (2,404,727,030)	$ (1,502,377,342)
Parent Company [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Other financing receivables			31,416,091
Other non-financing receivables			59,825,720
Other current assets			2,829,233
Total current assets			343,035,041
Wells, pipelines, properties, plant and equipment, net			1,277,548,562
Other assets			4,654,007
Total non-current assets			1,641,212,039
Accumulated deficit from prior years			(1,933,106,785)
Net loss for the year			(282,112,024)	(180,419,837)
Total equity (deficit)			(1,931,409,302)
Previously Reported [member] | Parent Company [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Other accounts receivable			91,241,811
Other current assets			346,563
Total current assets			340,552,371
Wells, pipelines, properties, plant and equipment, net			1,211,749,502
Other assets			7,136,677
Total non-current assets			1,577,895,649
Accumulated deficit from prior years			(1,933,106,785)
Net loss for the year			(347,911,084)	$ (180,419,837)
Total equity (deficit)			(1,997,208,362)
Reclassification [Member] | Parent Company [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Other accounts receivable			(91,241,811)
Other financing receivables			31,416,091
Other non-financing receivables			59,825,720
Other current assets			2,482,670
Total current assets			2,482,670
Other assets			(2,482,670)
Total non-current assets			(2,482,670)
Adjustment of non-material correction [Member] | Parent Company [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Wells, pipelines, properties, plant and equipment, net			65,799,060
Total non-current assets			65,799,060
Net loss for the year			65,799,060
Total equity (deficit)			$ 65,799,060

Accounting Changes Splits Adj_5

Accounting Changes Splits Adjustments Reclassifications and Corrections of Non-Material Errors - Summary of Consolidated Statement Of Comprehensive Income (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)	Dec. 31, 2020MXN ($)	Dec. 31, 2019MXN ($)	Dec. 31, 2018MXN ($)
Disclosure Of Detailed Information About Regrouped Consolidated And Separate Comprehensive Statements Explanatory [Line Items]
Impairment (reversal of impairment) of wells, pipelines, properties, plant and equipment, net	$ (1,822,359)	$ (36,353,700)	$ (31,283,154)	$ 21,418,997
Total cost of sales, net	47,805,715	953,661,844	1,401,971,185	1,681,119,150
Derivative financial instruments (cost) income, net	857,005	17,096,141	(23,263,923)	(19,115,951)
Sum of financing (costs) net, derivative instruments (cost) and foreign exchange gains, net	(12,876,847)	(256,876,357)	(39,959,272)	(87,769,033)
Net loss	$ (25,518,054)	$ (509,052,065)	(282,112,024)	(180,419,837)
Parent Company [Member]
Disclosure Of Detailed Information About Regrouped Consolidated And Separate Comprehensive Statements Explanatory [Line Items]
Cost of sales			1,122,933,424
Impairment (reversal of impairment) of wells, pipelines, properties, plant and equipment, net			(31,283,154)
Total cost of sales, net			1,154,216,578
Finance income			29,235,603	(123,869,684)
Derivative financial instruments (cost) income, net			(23,263,923)	(19,115,951)
Sum of financing (costs) net, derivative instruments (cost) and foreign exchange gains, net			(39,959,272)	(87,769,033)
Net loss			(282,112,024)	(180,419,837)
Previously Reported [member] | Parent Company [Member]
Disclosure Of Detailed Information About Regrouped Consolidated And Separate Comprehensive Statements Explanatory [Line Items]
Cost of sales			1,122,933,424
Impairment (reversal of impairment) of wells, pipelines, properties, plant and equipment, net			(97,082,214)
Total cost of sales, net			1,220,015,638
Finance income			24,483,706	(120,727,022)
Derivative financial instruments (cost) income, net			(18,512,026)	22,258,613
Sum of financing (costs) net, derivative instruments (cost) and foreign exchange gains, net			(39,959,272)	(87,769,033)
Net loss			(347,911,084)	(180,419,837)
Reclassification [Member] | Parent Company [Member]
Disclosure Of Detailed Information About Regrouped Consolidated And Separate Comprehensive Statements Explanatory [Line Items]
Finance income			4,751,897	(3,142,662)
Derivative financial instruments (cost) income, net			(4,751,897)	$ 3,142,662
Adjustment of non-material correction [Member] | Parent Company [Member]
Disclosure Of Detailed Information About Regrouped Consolidated And Separate Comprehensive Statements Explanatory [Line Items]
Impairment (reversal of impairment) of wells, pipelines, properties, plant and equipment, net			65,799,060
Total cost of sales, net			65,799,060
Net loss			$ 65,799,060

Accounting Changes Splits Adj_6

Accounting Changes Splits Adjustments Reclassifications and Corrections of Non-Material Errors - Summary of Consolidated Statement of Cash Flow Statement (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)	Dec. 31, 2020MXN ($)	Dec. 31, 2019MXN ($)	Dec. 31, 2018MXN ($)
Condensed Cash Flow Statements, Captions [Line Items]
Net loss	$ (25,518,054)	$ (509,052,065)	$ (282,112,024)	$ (180,419,837)
(Impairment) reversal of impairment) deterioration of wells, pipelines, properties, plant and equipment, net	1,822,359	36,353,700	31,283,154	(21,418,997)
Interest income	46,938	936,350	16,217,132
Interest expense	8,109,062	161,765,242	132,861,340	123,869,684
Accounts receivable	(1,020,287)	(20,353,395)	(8,534,028)	(3,429,171)
Net cash flows from operating activities	$ 3,273,081	$ 65,293,662	85,220,514	141,786,590
Parent Company [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net loss			(282,112,024)	(180,419,837)
(Impairment) reversal of impairment) deterioration of wells, pipelines, properties, plant and equipment, net			31,283,154
Interest income			(29,235,603)
Interest expense				123,869,684
Funds from operating activities			346,570,859	516,361,224
Accounts receivable			(8,534,028)	(3,429,171)
Net cash flows from operating activities			85,220,514	141,786,590
Parent Company [Member] | Previously Reported [member]
Condensed Cash Flow Statements, Captions [Line Items]
Net loss			(347,911,084)	(180,419,837)
(Impairment) reversal of impairment) deterioration of wells, pipelines, properties, plant and equipment, net			97,082,214
Interest income			(24,483,706)
Interest expense				120,727,022
Funds from operating activities			351,322,756	513,218,562
Accounts receivable			(13,285,925)	(286,509)
Net cash flows from operating activities			85,220,514	141,786,590
Parent Company [Member] | Reclassification [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Interest income			(4,751,897)
Interest expense				3,142,662
Funds from operating activities			(4,751,897)	3,142,662
Accounts receivable			4,751,897	$ (3,142,662)
Parent Company [Member] | Adjustment of non-material correction [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net loss			65,799,060
(Impairment) reversal of impairment) deterioration of wells, pipelines, properties, plant and equipment, net			$ (65,799,060)

Subsidiary Entities and Subsi_2

Subsidiary Entities and Subsidiary Companies - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2020
Disclosure of subsidiaries [line items]
Proportion of ownership interest held	100.00%
PMI CIM [member]
Disclosure of subsidiaries [line items]
Proportion of voting rights held in subsidiary	98.33%
COMESA [Member]
Disclosure of subsidiaries [line items]
Proportion of voting rights held in subsidiary	60.00%

Segment Financial Information -

Segment Financial Information - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2020Segment
Disclosure of operating segments [abstract]
Number of business segments	6
Number of major customers	19

Segment Financial Information_2

Segment Financial Information - Condensed Financial Information of Segments after Elimination of Unrealized Intersegment Gain (Loss) (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)	Dec. 31, 2020MXN ($)	Dec. 31, 2019MXN ($)	Dec. 31, 2018MXN ($)	Dec. 31, 2020MXN ($)	Dec. 31, 2017MXN ($)
Sales:
Trade		$ 948,946,360	$ 1,392,862,505	$ 1,672,446,148
Services income	$ 236,381	4,715,484	9,108,680	8,673,002
(Impairment) reversal of wells, pipelines, properties, plant and equipment, net	(1,822,359)	(36,353,700)	(31,283,154)	21,418,997
Cost of sales	41,737,792	832,614,690	1,122,933,424	1,199,511,561
Gross income	4,245,564	84,693,454	247,754,607	503,026,586
Other revenue	589,956	11,768,846	14,940,447	41,517,631
Other expenses		(1,194,714)	(7,211,691)	(18,465,120)
Distribution, transportation and sales expenses	623,411	12,436,242	21,885,911	24,357,209
Administrative expenses	7,313,481	145,894,444	130,768,822	134,321,481
Operating income (loss)	(3,161,261)	(63,063,100)	102,828,630	367,400,407
Financing income	839,255	16,742,048	29,235,603	31,557,122
Financing cost	(8,109,062)	(161,765,242)	(132,861,340)	(123,869,684)
Derivative financial instruments (cost) income, net	857,005	17,096,141	(23,263,923)	(19,115,951)
Foreign exchange (loss), net	(6,464,045)	(128,949,304)	86,930,388	23,659,480
(Loss) profit sharing in joint ventures and associates, net	(177,482)	(3,540,533)	(1,157,893)	1,527,012
Taxes, duties and other		185,572,075	343,823,489	461,578,223
Net loss for the year	(25,518,054)	(509,052,065)	(282,112,024)	(180,419,837)
Total current assets	16,535,400		343,035,041		$ 329,859,739
Total non-current assets	80,136,961		1,641,212,039		1,598,628,189
Total current liabilities	38,719,820		552,203,628		772,410,071
Total non-current liabilities	178,498,093		3,363,452,754		3,560,804,887
Equity (deficit), net	(120,545,552)		(1,931,409,302)	(1,459,405,432)	(2,404,727,030)	$ (1,502,377,342)
Depreciation and amortization	6,498,259	129,631,820	137,187,010	153,382,040
Depreciation of rights of use	$ 362,391	7,229,231	7,429,275
Net periodic cost of employee benefits excluding items recognized in other comprehensive income		128,808,540	116,176,949	114,621,614
Exploration and production [member]
Sales:
Trade		301,393,451	409,059,838	482,262,631
Intersegment		242,454,754	333,735,644	400,613,623
Services income		133,315	473,324	221,885
(Impairment) reversal of wells, pipelines, properties, plant and equipment, net		35,031,541	(104,035,887)	65,013,616
Cost of sales		391,513,815	472,489,346	401,629,016
Gross income		187,499,246	166,743,573	546,482,739
Other revenue		2,162,510	6,796,590	23,734,616
Other expenses		(896,526)	(6,134,114)	(15,057,062)
Distribution, transportation and sales expenses		251,625	262,642	106,573
Administrative expenses		72,457,241	59,171,975	68,953,644
Operating income (loss)		116,056,364	107,971,432	486,100,076
Financing income		77,700,999	87,737,456	94,359,725
Financing cost		(164,419,519)	(134,241,910)	(131,257,815)
Derivative financial instruments (cost) income, net		24,939,748	(7,014,529)	(15,989,398)
Foreign exchange (loss), net		(116,528,387)	78,315,007	28,066,138
(Loss) profit sharing in joint ventures and associates, net		(61,956)	28,770	54,149
Taxes, duties and other		154,609,136	373,640,107	469,262,312
Net loss for the year		(216,921,887)	(240,843,881)	(7,929,437)
Total current assets			987,717,368		937,017,021
Total non-current assets			833,264,268		884,741,960
Total current liabilities			393,129,182		464,163,895
Total non-current liabilities			2,210,050,053		2,363,252,154
Equity (deficit), net			(782,197,599)		(1,005,657,068)
Depreciation and amortization		101,126,295	103,328,661	126,154,366
Depreciation of rights of use		313,008	352,286
Net periodic cost of employee benefits excluding items recognized in other comprehensive income		35,356,366	34,534,805	33,715,993
Industrial transformation [member]
Sales:
Trade		477,729,504	797,167,115	973,367,343
Intersegment		97,303,328	127,887,636	143,632,442
Services income		190,748	2,088,771	559,515
(Impairment) reversal of wells, pipelines, properties, plant and equipment, net		(71,761,571)	42,243,942	659,610
Cost of sales		655,617,229	970,522,186	1,107,749,282
Gross income		(152,155,220)	(1,134,722)	10,469,628
Other revenue		4,092,943	3,110,226	6,784,333
Other expenses		(130,926)	(551,926)	(1,263,087)
Distribution, transportation and sales expenses		14,423,570	24,007,852	26,867,986
Administrative expenses		51,017,304	50,652,341	53,474,193
Operating income (loss)		(213,634,077)	(73,236,615)	(64,351,305)
Financing income		223,712	1,938,163	7,502,075
Financing cost		(11,491,708)	(6,346,480)	(1,990,001)
Derivative financial instruments (cost) income, net		22,862	(9,231)	(11,304)
Foreign exchange (loss), net		(8,893,829)	3,674,481	(1,736,100)
(Loss) profit sharing in joint ventures and associates, net		1,346,829	105,447
Taxes, duties and other			(1,446,202)	1,446,202
Net loss for the year		(232,426,211)	(72,428,033)	(62,032,837)
Total current assets			220,885,024		152,553,067
Total non-current assets			385,174,767		328,449,091
Total current liabilities			290,128,797		388,367,873
Total non-current liabilities			682,521,743		714,289,669
Equity (deficit), net			(366,590,749)		(621,655,384)
Depreciation and amortization		19,734,723	25,260,746	20,569,085
Depreciation of rights of use		4,679,723	4,858,427
Net periodic cost of employee benefits excluding items recognized in other comprehensive income		51,176,601	54,347,829	51,247,894
Logistics [member]
Sales:
Intersegment		80,575,471	88,604,529	63,672,574
Services income		4,099,000	4,663,770	4,708,217
(Impairment) reversal of wells, pipelines, properties, plant and equipment, net		426,560	34,119,240	(40,288,338)
Cost of sales		43,614,768	51,298,858	42,694,683
Gross income		41,486,263	76,088,681	(14,602,230)
Other revenue		513,076	202,800	178,431
Other expenses		(7,445)	(311,878)	(40,248,271)
Distribution, transportation and sales expenses		107,691	22,467	82,755
Administrative expenses		15,762,946	8,504,381	11,592,604
Operating income (loss)		26,121,257	67,452,755	(66,347,429)
Financing income		3,340,622	697,130	1,351,514
Financing cost		(450,802)	(434,392)	(220,721)
Foreign exchange (loss), net		(442,139)	214,157	167,982
(Loss) profit sharing in joint ventures and associates, net		3,813	(17,682)	(1,092)
Taxes, duties and other		4,842,171	(19,902,667)	(2,474,189)
Net loss for the year		23,730,580	87,814,635	(62,575,557)
Total current assets			111,906,985		166,202,857
Total non-current assets			160,050,916		167,498,268
Total current liabilities			28,995,291		39,568,364
Total non-current liabilities			78,111,581		90,624,955
Equity (deficit), net			164,851,029		203,507,806
Depreciation and amortization		5,917,668	6,521,380	4,409,226
Depreciation of rights of use		460,957	228,929
Net periodic cost of employee benefits excluding items recognized in other comprehensive income		8,927,651	243,330	191,132
Fertilizers [member]
Sales:
Trade		1,515,464	1,634,300	2,933,424
Intersegment		425,374	560,987	65,802
Services income		919	853	4,742
(Impairment) reversal of wells, pipelines, properties, plant and equipment, net		(92,444)	(2,298,775)	(2,246,264)
Cost of sales		3,070,962	3,380,826	4,509,881
Gross income		(1,221,649)	(3,483,461)	(3,752,177)
Other revenue		13,355	22,575	81,808
Other expenses		6,204	(7,147)	(10,389)
Distribution, transportation and sales expenses		400,170	288,347	387,397
Administrative expenses		1,099,456	615,830	785,883
Operating income (loss)		(2,701,716)	(4,372,210)	(4,854,038)
Financing income		245,510	65,049	4,916
Financing cost		(674,869)	(770,869)	(478,044)
Foreign exchange (loss), net		(166,971)	48,226	(2,577)
(Loss) profit sharing in joint ventures and associates, net		(2,362,891)	(2,314,587)
Net loss for the year		(5,660,937)	(7,344,391)	(5,329,743)
Total current assets			7,783,507		2,960,958
Total non-current assets			1,710,361		3,404,696
Total current liabilities			12,648,563		17,328,604
Total non-current liabilities			6,121,684		453,465
Equity (deficit), net			(9,276,379)		(11,416,415)
Depreciation and amortization		10,137	(323,902)	(246,697)
Depreciation of rights of use		35,515	35,515
Net periodic cost of employee benefits excluding items recognized in other comprehensive income		669,076	(6,361)	9,162
Trading Companies [member]
Sales:
Trade		159,786,736	175,509,189	204,103,954
Intersegment		280,924,383	484,139,042	640,382,216
Services income		229,140	67,982	64,038
(Impairment) reversal of wells, pipelines, properties, plant and equipment, net		42,214	(1,311,674)	(1,719,627)
Cost of sales		430,672,407	646,671,417	837,820,025
Gross income		10,310,066	11,733,122	5,010,556
Other revenue		874,412	444,289	1,703,304
Other expenses		(86,960)		87,697
Distribution, transportation and sales expenses		1,277,980	1,323,007	280,407
Administrative expenses		2,106,780	2,575,536	1,541,092
Operating income (loss)		7,712,758	8,278,868	4,980,058
Financing income		307,229	801,046	702,471
Financing cost		(812,552)	(971,573)	(1,379,583)
Derivative financial instruments (cost) income, net		(1,794,243)	(1,471,566)	382,568
Foreign exchange (loss), net		(750,041)	(212,619)	920,488
(Loss) profit sharing in joint ventures and associates, net		(1,931,323)	1,195,058	1,012,490
Taxes, duties and other		3,413,999	2,433,349	1,840,409
Net loss for the year		(682,171)	5,185,865	4,778,083
Total current assets			161,329,297		168,261,357
Total non-current assets			43,098,566		40,084,813
Total current liabilities			125,341,872		129,161,357
Total non-current liabilities			3,382,236		1,121,488
Equity (deficit), net			75,703,755		78,063,325
Depreciation and amortization		317,241	93,193	403,122
Depreciation of rights of use		992,148	1,288,306
Net periodic cost of employee benefits excluding items recognized in other comprehensive income		(1,156)	37,512	(321,683)
Corporate and other operating subsidiary companies [member]
Sales:
Trade		8,521,205	9,492,063	9,778,796
Intersegment		98,451,594	100,021,336	119,762,378
Services income		62,362	1,813,980	3,114,605
Cost of sales		27,536,221	49,979,372	54,148,722
Gross income		79,498,940	61,348,007	78,507,057
Other revenue		4,112,550	4,363,967	7,683,041
Other expenses		(113,590)	(130,791)	(911,091)
Distribution, transportation and sales expenses		209,676	31,323	94,457
Administrative expenses		79,922,661	68,791,707	74,525,804
Operating income (loss)		3,365,563	(3,241,847)	10,658,746
Financing income		162,801,375	156,297,750	142,481,311
Financing cost		(211,776,436)	(208,419,002)	(202,865,030)
Derivative financial instruments (cost) income, net		(6,072,226)	(14,768,593)	(3,497,812)
Foreign exchange (loss), net		(2,167,937)	4,891,136	(3,756,451)
(Loss) profit sharing in joint ventures and associates, net		(441,711,566)	(295,764,002)	(124,094,148)
Taxes, duties and other		22,706,769	(10,901,098)	(8,496,511)
Net loss for the year		(518,267,996)	(350,103,460)	(172,576,873)
Total current assets			718,398,444		906,149,787
Total non-current assets			1,001,349,312		750,322,623
Total current liabilities			1,564,317,345		1,734,633,918
Total non-current liabilities			2,080,349,970		2,218,921,311
Equity (deficit), net			(1,924,919,559)		(2,297,082,819)
Depreciation and amortization		2,525,756	2,306,932	2,092,938
Depreciation of rights of use		747,880	665,812
Net periodic cost of employee benefits excluding items recognized in other comprehensive income		32,680,002	27,019,834	26,861,666
Eliminations [member]
Sales:
Intersegment		(800,134,904)	(1,134,949,174)	(1,368,129,035)
Cost of sales		(719,410,712)	(1,071,408,581)	(1,249,040,048)
Gross income		(80,724,192)	(63,540,593)	(119,088,987)
Other revenue				1,352,098
Other expenses		34,529	(75,835)	38,937,083
Distribution, transportation and sales expenses		(4,234,470)	(4,049,727)	(3,462,366)
Administrative expenses		(76,471,944)	(59,542,948)	(76,551,739)
Operating income (loss)		16,751	(23,753)	1,214,299
Financing income		(227,877,399)	(218,300,991)	(214,844,890)
Financing cost		227,860,644	218,322,886	214,321,510
Derivative financial instruments (cost) income, net			(4)	(5)
(Loss) profit sharing in joint ventures and associates, net		441,176,561	295,609,103	124,555,613
Net loss for the year		$ 441,176,557	295,607,241	125,246,527
Total current assets			(1,864,985,584)		(2,003,285,308)
Total non-current assets			(783,436,151)		(575,873,262)
Total current liabilities			(1,862,357,422)		(2,000,813,940)
Total non-current liabilities			(1,697,084,513)		(1,827,858,155)
Equity (deficit), net			$ 911,020,200		$ 1,249,513,525
Net periodic cost of employee benefits excluding items recognized in other comprehensive income				$ 2,917,450

Segment Financial Information_3

Segment Financial Information - Supplemental Geographic Information (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)	Dec. 31, 2020MXN ($)	Dec. 31, 2019MXN ($)	Dec. 31, 2018MXN ($)
Disclosure of operating segments [line items]
Domestic sales	$ 25,250,369	$ 503,712,031	$ 807,020,214	$ 980,559,538
Total export sales	22,318,965	445,234,329	585,842,291	691,886,610
Services income	236,381	4,715,484	9,108,680	8,673,002
Total sales	$ 47,805,715	953,661,844	1,401,971,185	1,681,119,150
United States [member]
Disclosure of operating segments [line items]
Total export sales		304,344,028	372,134,617	434,838,159
Canada, Central and South America [member]
Disclosure of operating segments [line items]
Total export sales		2,105,703	3,102,066	11,274,714
Europe [member]
Disclosure of operating segments [line items]
Total export sales		45,254,008	131,498,445	158,900,339
Other [member]
Disclosure of operating segments [line items]
Total export sales		$ 93,530,590	$ 79,107,163	$ 86,873,398

Segment Financial Information_4

Segment Financial Information - Supplemental Geographic Information (Parenthetical) (Detail)	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of operating segments [abstract]
Percentage of service income from domestic sales	97.00%	80.00%	63.00%

Segment Financial Information_5

Segment Financial Information - Schedule of Income by Product (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)	Dec. 31, 2020MXN ($)	Dec. 31, 2019MXN ($)	Dec. 31, 2018MXN ($)
Disclosure of operating segments [line items]
Total domestic sales	$ 25,250,369	$ 503,712,031	$ 807,020,214	$ 980,559,538
Total export sales	$ 22,318,965	445,234,329	585,842,291	691,886,610
Operating segments [member]
Disclosure of operating segments [line items]
Total domestic sales		503,712,031	807,020,214	980,559,538
Total export sales		445,234,329	585,842,291	691,886,610
Operating segments [member] | Refined Petroleum Products and Derivatives [member]
Disclosure of operating segments [line items]
Total domestic sales		409,240,569	725,759,040	850,342,124
Total export sales		107,391,773	118,495,443	167,796,526
Operating segments [member] | Gas [member]
Disclosure of operating segments [line items]
Total domestic sales		79,176,837	66,303,063	110,219,691
Total export sales		32,192,334	53,353,075	34,446,277
Operating segments [member] | Petrochemical Products [member]
Disclosure of operating segments [line items]
Total domestic sales		15,294,625	14,958,111	19,997,723
Total export sales		4,451,108	5,222,381	7,384,762
Operating segments [member] | Crude oil [member]
Disclosure of operating segments [line items]
Total export sales		$ 301,199,114	$ 408,771,392	$ 482,259,045

Revenue - Schedule of Revenue D

Revenue - Schedule of Revenue Disaggregation (Detail) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	$ 953,661,844	$ 1,401,971,185	$ 1,681,119,150
Products transferred at point in time [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	953,178,675	1,397,526,275	1,677,154,365
Products and services transferred over time [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	483,169	4,444,910	3,964,785
Crude oil [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	301,199,114	408,771,392	482,259,045
Gas [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	111,369,171	119,656,138	144,665,968
Refined petroleum products [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	516,632,342	844,254,483	1,018,138,650
Other products [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	19,745,733	20,180,492	27,382,485
Services [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	4,715,484	9,108,680	8,673,002
United States [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	304,344,028	372,134,617	435,498,860
Other [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	95,655,191	82,209,230	98,112,022
Europe [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	45,254,009	133,288,185	161,318,286
Local Country [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	508,408,616	814,339,153	986,189,982
Exploration and production [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	301,526,766	409,533,162	482,484,516
Exploration and production [member] | Products transferred at point in time [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	301,526,766	409,059,838	482,262,631
Exploration and production [member] | Products and services transferred over time [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	0	473,324	221,885
Exploration and production [member] | Crude oil [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	301,199,114	408,771,392	482,259,045
Exploration and production [member] | Gas [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	194,337	288,446	3,586
Exploration and production [member] | Services [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	133,315	473,324	221,885
Exploration and production [member] | United States [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	171,640,991	226,689,583	276,785,650
Exploration and production [member] | Other [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	85,271,096	57,106,954	51,708,232
Exploration and production [member] | Europe [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	44,287,027	124,974,855	153,765,163
Exploration and production [member] | Local Country [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	327,652	761,770	225,471
Industrial transformation [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	477,920,252	799,255,886	973,926,858
Industrial transformation [member] | Products transferred at point in time [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	477,729,504	797,167,115	973,367,343
Industrial transformation [member] | Products and services transferred over time [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	190,748	2,088,771	559,515
Industrial transformation [member] | Gas [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	60,076,159	66,014,617	110,216,105
Industrial transformation [member] | Refined petroleum products [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	409,240,569	722,239,101	850,342,124
Industrial transformation [member] | Other products [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	8,412,776	8,913,397	12,809,114
Industrial transformation [member] | Services [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	190,748	2,088,771	559,515
Industrial transformation [member] | Local Country [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	477,920,252	799,255,886	973,926,858
Logistics [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	4,099,000	4,663,770	4,708,217
Logistics [member] | Products transferred at point in time [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	4,099,000	4,663,770	4,708,217
Logistics [member] | Services [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	4,099,000	4,663,770	4,708,217
Logistics [member] | Local Country [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	4,099,000	4,663,770	4,708,217
Fertilizers [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	1,516,383	1,635,153	2,938,166
Fertilizers [member] | Products transferred at point in time [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	1,515,464	1,634,300	2,933,424
Fertilizers [member] | Products and services transferred over time [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	919	853	4,742
Fertilizers [member] | Other products [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	1,515,464	1,634,300	2,933,424
Fertilizers [member] | Services [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	919	853	4,742
Fertilizers [member] | Local Country [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	1,516,383	1,635,153	2,938,166
Trading Companies [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	160,015,876	175,577,171	204,167,992
Trading Companies [member] | Products transferred at point in time [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	159,786,736	175,509,189	204,103,954
Trading Companies [member] | Products and services transferred over time [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	229,140	67,982	64,038
Trading Companies [member] | Gas [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	51,098,675	53,353,075	34,446,277
Trading Companies [member] | Refined petroleum products [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	107,391,773	121,028,417	167,796,526
Trading Companies [member] | Other products [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	1,296,288	1,127,697	1,861,151
Trading Companies [member] | Services [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	229,140	67,982	64,038
Trading Companies [member] | United States [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	131,653,920	144,578,641	158,713,210
Trading Companies [member] | Other [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	8,259,494	21,001,222	40,743,480
Trading Companies [member] | Europe [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	966,982	6,409,388	4,647,265
Trading Companies [member] | Local Country [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	19,135,480	3,587,920	64,037
Corporate and other operating subsidiary companies [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	8,583,567	11,306,043	12,893,401
Corporate and other operating subsidiary companies [member] | Products transferred at point in time [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	8,521,205	9,492,063	9,778,796
Corporate and other operating subsidiary companies [member] | Products and services transferred over time [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	62,362	1,813,980	3,114,605
Corporate and other operating subsidiary companies [member] | Refined petroleum products [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers		986,965
Corporate and other operating subsidiary companies [member] | Other products [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	8,521,205	8,505,098	9,778,796
Corporate and other operating subsidiary companies [member] | Services [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	62,362	1,813,980	3,114,605
Corporate and other operating subsidiary companies [member] | United States [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	1,049,117	866,393
Corporate and other operating subsidiary companies [member] | Other [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	2,124,601	4,101,054	5,660,310
Corporate and other operating subsidiary companies [member] | Europe [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers		1,903,942	2,905,858
Corporate and other operating subsidiary companies [member] | Local Country [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	$ 5,409,849	$ 4,434,654	$ 4,327,233

Revenue - Additional Informatio

Revenue - Additional Information (Detail) $ in Thousands

Nov. 30, 2020Barrels_per_day

Oct. 31, 2020Barrels_per_day

Sep. 30, 2020Barrels_per_day

Aug. 31, 2020Barrels_per_day

Jul. 31, 2020Barrels_per_day

Jun. 30, 2020Barrels_per_day

May 31, 2020Barrels_per_day

Apr. 20, 2020$ / shares

May 31, 2020$ / bbl

Jun. 30, 2020Barrels_per_day

Dec. 31, 2020MXN ($)Barrels_per_day

Dec. 31, 2020MXN ($)

Dec. 31, 2020MXN ($)$ / shares

Dec. 31, 2019MXN ($)

Apr. 30, 2022Barrels_per_day

Disclosure of geographical areas [line items]

Accounts receivable derived from customer contracts | $

$ 68,382,413

$ 68,382,413

$ 68,382,413

$ 89,263,870

Increase decrease in crude oil production | Barrels_per_day

9,700,000

7,700,000

Percentage of decrease in domestic sales of petroleum products

32.00%

32.00%

32.00%

Amount recorded in advance from customers were recognized as revenue for the Period | $

$ 6,627,033

6,154,333

Accounts and accrued expenses

Disclosure of geographical areas [line items]

Advances from customers | $

$ 8,548,260

$ 8,548,260

$ 8,548,260

$ 6,627,033

Non Adjusting Event Reporting Period

Disclosure of geographical areas [line items]

Increase decrease in crude oil production | Barrels_per_day

1,688,800

1,680,200

1,697,800

1,687,900

1,647,300

1,654,700

1,676,600

5,800,000

Bottom of range [member]

Disclosure of geographical areas [line items]

Number Of Barrels Production Per Day | $ / bbl

100,000

Crude Oil Price Per Barrel

$ 10.52

Weighted average [member]

Disclosure of geographical areas [line items]

Crude Oil Price Per Barrel

47.16

Mexica Country

Disclosure of geographical areas [line items]

Crude Oil Price Per Barrel

49

Mexica Country | Bottom of range [member]

Disclosure of geographical areas [line items]

Crude Oil Price Per Barrel

44

Mexica Country | Bottom of range [member] | Non Adjusting Event Reporting Period

Disclosure of geographical areas [line items]

Unprecedented drop in price of crude oil price

$ 2.37

Mexica Country | Top of range [member]

Disclosure of geographical areas [line items]

Crude Oil Price Per Barrel

$ 49

Mexica Country | Top of range [member] | Non Adjusting Event Reporting Period

Disclosure of geographical areas [line items]

Unprecedented drop in price of crude oil price

$ 0

Financial Instruments - Summary

Financial Instruments - Summary of Carrying Amounts and Fair Value of Financial Assets and Liabilities (Detail) $ in Thousands, $ in Thousands	Dec. 31, 2020USD ($)	Dec. 31, 2020MXN ($)	Dec. 31, 2019USD ($)	Dec. 31, 2019MXN ($)	Nov. 25, 2019USD ($)	Nov. 25, 2019MXN ($)	Dec. 31, 2018MXN ($)	Dec. 28, 2018USD ($)	Dec. 28, 2018MXN ($)	Dec. 31, 2017MXN ($)
Disclosure of detailed information about financial instruments [line items]
Cash and cash equivalents	$ 2,004,631	$ 39,989,781	$ 3,038,876	$ 60,621,631			$ 81,912,409			$ 97,851,754
Customers, net	3,427,913	68,382,413		89,263,870
Other non-financing accounts receivable		3,539,505		3,667,242
Sundry debtors		28,076,118		27,748,849
Investments in joint ventures and associates	602,301	12,015,129		14,874,579
Notes receivable		886,827		122,565,306
Government bonds		129,320,536
Other assets		31,615,623		31,416,091
Suppliers	(14,135,159)	(281,978,041)		(208,034,407)
Accounts and accrued expenses payable	$ (1,539,423)	(30,709,497)		(26,055,151)
Leases		(63,184,128)		(68,148,627)			$ (70,651,797)
Debt		(2,232,694,117)		(2,035,079,540)	$ (1,851,000)	$ (34,875,000)		$ (5,640,000)	$ (112,000,000)
Derivatives [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets measured at fair value		25,947,993		11,496,330
Equity instruments [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets measured at fair value		384,665		346,563
Derivative liabilities [member]
Disclosure of detailed information about financial instruments [line items]
Financial liabilities measured at fair value		(9,318,015)
Derivative liabilities [member] | Derivatives [member]
Disclosure of detailed information about financial instruments [line items]
Financial liabilities measured at fair value				(16,650,171)
Carrying amount [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets measured at fair value		26,332,658		11,842,893
Cash and cash equivalents		39,989,781		60,621,631
Customers, net		68,382,413		89,263,870
Other non-financing accounts receivable		1,944,413
Officials and employees		3,539,505		3,667,242
Sundry debtors		28,076,118		27,748,849
Investments in joint ventures and associates		12,015,129		14,874,579
Notes receivable		886,827		127,475,276
Government bonds		129,549,519
Other assets		3,824,923		3,451,096
Financial assets not measured at fair value		288,208,618		327,102,543
Financial liabilities measured at fair value		(9,318,015)		(16,650,171)
Suppliers		(281,978,041)		(208,034,407)
Accounts and accrued expenses payable		(30,709,497)		(26,055,151)
Leases		(63,184,128)		(68,148,627)
Debt		(2,258,727,317)		(1,983,174,088)
Financial liabilities not measured at fair value		(2,634,598,983)		(2,285,412,273)
Carrying amount [member] | FVTPL [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets measured at fair value		25,947,993		11,496,330
Financial liabilities measured at fair value		(9,318,015)
Carrying amount [member] | FVOCI - equity instruments [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets measured at fair value		384,665		346,563
Carrying amount [member] | Financial assets at amortised cost [member]
Disclosure of detailed information about financial instruments [line items]
Cash and cash equivalents		39,989,781		60,621,631
Customers, net		68,382,413		89,263,870
Other non-financing accounts receivable		1,944,413
Officials and employees		3,539,505		3,667,242
Sundry debtors		28,076,118		27,748,849
Investments in joint ventures and associates		12,015,129		14,874,579
Notes receivable		886,827		127,475,276
Government bonds		129,549,519
Other assets		3,824,923		3,451,096
Financial assets not measured at fair value		288,208,618		327,102,543
Carrying amount [member] | Derivatives [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets measured at fair value		25,947,993		11,496,330
Carrying amount [member] | Derivatives [member] | FVTPL [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets measured at fair value		25,947,993		11,496,330
Carrying amount [member] | Equity instruments [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets measured at fair value		384,665		346,563
Carrying amount [member] | Equity instruments [member] | FVOCI - equity instruments [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets measured at fair value		384,665		346,563
Carrying amount [member] | Financial liabilities at fair value through profit or loss, designated upon initial recognition or subsequently, category [member]
Disclosure of detailed information about financial instruments [line items]
Financial liabilities measured at fair value				(16,650,171)
Carrying amount [member] | Other financial liabilities [member]
Disclosure of detailed information about financial instruments [line items]
Suppliers		(281,978,041)		(208,034,407)
Accounts and accrued expenses payable		(30,709,497)		(26,055,151)
Leases		(63,184,128)		(68,148,627)
Debt		(2,258,727,317)		(1,983,174,088)
Financial liabilities not measured at fair value		(2,634,598,983)		(2,285,412,273)
Carrying amount [member] | Derivative liabilities [member]
Disclosure of detailed information about financial instruments [line items]
Financial liabilities measured at fair value		(9,318,015)		(16,650,171)
Carrying amount [member] | Derivative liabilities [member] | FVTPL [member]
Disclosure of detailed information about financial instruments [line items]
Financial liabilities measured at fair value		(9,318,015)
Carrying amount [member] | Derivative liabilities [member] | Financial liabilities at fair value through profit or loss, designated upon initial recognition or subsequently, category [member]
Disclosure of detailed information about financial instruments [line items]
Financial liabilities measured at fair value				(16,650,171)
Level 2 [member]
Disclosure of detailed information about financial instruments [line items]
Debt		(2,232,694,117)		(2,035,079,540)
Level 2 [member] | Derivatives [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets measured at fair value		25,947,993		11,496,330
Level 2 [member] | Equity instruments [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets measured at fair value		384,665		346,563
Level 2 [member] | Derivative liabilities [member]
Disclosure of detailed information about financial instruments [line items]
Financial liabilities measured at fair value		(9,318,015)
Level 2 [member] | Derivative liabilities [member] | Derivatives [member]
Disclosure of detailed information about financial instruments [line items]
Financial liabilities measured at fair value				$ (16,650,171)
Level 1 [member]
Disclosure of detailed information about financial instruments [line items]
Government bonds		$ 129,320,536

Financial Instruments - Summa_2

Financial Instruments - Summary of Monetary Assets and Liabilities Denominated In Foreign Currency (Detail) $ in Thousands, $ in Thousands	May 11, 2021Exchange_Rate	Dec. 31, 2020USD ($)	Dec. 31, 2020MXN ($)	Dec. 31, 2019USD ($)	Dec. 31, 2019MXN ($)
Monetary assets and liabilities denominated in foreign currency [line items]
Exchange rate	19.9223	19.9487	19.9487
Net Asset (Liability)			$ (1,992,052,586)		$ (1,911,654,039)
U.S [member]
Monetary assets and liabilities denominated in foreign currency [line items]
Asset		$ 7,293,404		$ 11,817,320
Exchange rate		19.9487	19.9487	18.8452	18.8452
Liability		$ 87,866,609		$ 76,053,967
Net Asset (Liability)		(80,573,205)	$ (1,607,330,695)	(64,236,647)	$ (1,210,552,460)
Euro [member]
Monetary assets and liabilities denominated in foreign currency [line items]
Asset		$ 2,564		$ 1,974
Exchange rate		24.4052	24.4052	21.1537	21.1537
Liability		$ 13,501,943		$ 27,932,908
Net Asset (Liability)		(13,499,379)	$ (329,455,044)	(27,930,934)	$ (590,842,599)
Pound sterling [member]
Monetary assets and liabilities denominated in foreign currency [line items]
Asset		$ 30		$ 29
Exchange rate		27.2579	27.2579	24.9586	24.9586
Liability		$ 819,590		$ 1,575,918
Net Asset (Liability)		$ (819,560)	$ (22,339,485)	$ (1,575,889)	$ (39,331,983)
Japan, yen [member]
Monetary assets and liabilities denominated in foreign currency [line items]
Exchange rate		0.1933	0.1933	0.1734	0.1734
Liability		$ 110,165,166		$ 221,975,145
Net Asset (Liability)		$ (110,165,166)	$ (21,294,927)	$ (221,975,145)	$ (38,490,490)
Swiss francs [member]
Monetary assets and liabilities denominated in foreign currency [line items]
Exchange rate		22.5720	22.5720	19.4596	19.4596
Liability		$ 515,348		$ 1,666,864
Net Asset (Liability)		$ (515,348)	$ (11,632,435)	$ (1,666,864)	$ (32,436,507)

Cash and Cash Equivalents - Sum

Cash and Cash Equivalents - Summary of Cash and Cash Equivalents (Detail) $ in Thousands, $ in Thousands	Dec. 31, 2020USD ($)	Dec. 31, 2020MXN ($)	Dec. 31, 2019USD ($)	Dec. 31, 2019MXN ($)	Dec. 31, 2018MXN ($)	Dec. 31, 2017MXN ($)
Cash and cash equivalents [abstract]
Cash on hand and in banks		$ 20,211,875		$ 27,502,675
Highly liquid investments		19,777,906		33,118,956
Cash and cash equivalents	$ 2,004,631	$ 39,989,781	$ 3,038,876	$ 60,621,631	$ 81,912,409	$ 97,851,754

Customers and Other Financing_3

Customers and Other Financing and Non-Financing Accounts Receivable - Summary of Accounts Receivable and Other Receivables (Detail) - MXN ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Trade and Other Receivables [Line Items]
Total customers	$ 68,382,413	$ 89,263,870
Domestic customers [member]
Trade and Other Receivables [Line Items]
Total customers	35,049,717	46,792,824
Export customers [member]
Trade and Other Receivables [Line Items]
Total customers	$ 33,332,696	$ 42,471,046

Customers and Other Financing_4

Customers and Other Financing and Non-Financing Accounts Receivable - Schedule of Breakdown of Accounts Receivable Based on Credit History (Detail) - MXN ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Trade and Other Receivables [Line Items]
Breakdown of accounts receivable	$ 68,382,413	$ 89,263,870
Domestic customers [member]
Trade and Other Receivables [Line Items]
Breakdown of accounts receivable	35,049,717	46,792,824
Domestic customers [member] | Carrying amount [member]
Trade and Other Receivables [Line Items]
Breakdown of accounts receivable	36,232,446	47,893,010
Domestic customers [member] | Current [member]
Trade and Other Receivables [Line Items]
Breakdown of accounts receivable	34,034,116	44,898,986
Domestic customers [member] | 1 to 30 days [member]
Trade and Other Receivables [Line Items]
Breakdown of accounts receivable	535,938	801,299
Domestic customers [member] | 31 to 60 days [member]
Trade and Other Receivables [Line Items]
Breakdown of accounts receivable	110,911	302,817
Domestic customers [member] | 61 to 90 days [member]
Trade and Other Receivables [Line Items]
Breakdown of accounts receivable	19,614	604,025
Domestic customers [member] | More than 90 days [member]
Trade and Other Receivables [Line Items]
Breakdown of accounts receivable	1,531,867	1,285,883
Domestic customers [member] | Impaired (reserved) [member]
Trade and Other Receivables [Line Items]
Breakdown of accounts receivable	(1,182,729)	(1,100,186)
Export customers [member]
Trade and Other Receivables [Line Items]
Breakdown of accounts receivable	33,332,696	42,471,046
Export customers [member] | Carrying amount [member]
Trade and Other Receivables [Line Items]
Breakdown of accounts receivable	33,544,059	42,653,869
Export customers [member] | Current [member]
Trade and Other Receivables [Line Items]
Breakdown of accounts receivable	30,346,622	36,037,725
Export customers [member] | 1 to 30 days [member]
Trade and Other Receivables [Line Items]
Breakdown of accounts receivable	2,925,807	5,895,862
Export customers [member] | 31 to 60 days [member]
Trade and Other Receivables [Line Items]
Breakdown of accounts receivable	73,026	11,120
Export customers [member] | 61 to 90 days [member]
Trade and Other Receivables [Line Items]
Breakdown of accounts receivable	8,063	31,182
Export customers [member] | More than 90 days [member]
Trade and Other Receivables [Line Items]
Breakdown of accounts receivable	190,541	677,980
Export customers [member] | Impaired (reserved) [member]
Trade and Other Receivables [Line Items]
Breakdown of accounts receivable	$ (211,363)	$ (182,823)

Customers and Other Financing_5

Customers and Other Financing and Non-Financing Accounts Receivable - Additional Information (Detail) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Trade and Other Receivables [Line Items]
Credit loss experience period	2 years
(Impairment) reversal of accounts receivables recognized in the income statement	$ (102,896)	$ (447,441)
Financing Receivable, Individually Evaluated for Impairment	$ (197,215)	$ (37,139)
Pemex fertilizers [member]
Trade and Other Receivables [Line Items]
Expected percentage of credit loss for accounts receivable	0.02%	1.72%
Pemex industrial transformation [member]
Trade and Other Receivables [Line Items]
Expected percentage of credit loss for accounts receivable	2.42%	1.06%
Pemex corporate [member]
Trade and Other Receivables [Line Items]
Expected percentage of credit loss for accounts receivable	4.79%	1.53%
Pemex logistics [member]
Trade and Other Receivables [Line Items]
Expected percentage of credit loss for accounts receivable	1.44%	1.20%
PMI CIM [member]
Trade and Other Receivables [Line Items]
Expected percentage of credit loss for accounts receivable	0.17%	0.07%
PMI TRD [member]
Trade and Other Receivables [Line Items]
Expected percentage of credit loss for accounts receivable	0.63%	0.47%

Customers and Other Financing_6

Customers and Other Financing and Non-Financing Accounts Receivable - Summary of Reconciliation for Impaired Accounts Receivable (Detail) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Trade and Other Receivables [Line Items]
Impairment accounts receivable	$ (102,896)	$ (447,441)
Domestic customers [member]
Trade and Other Receivables [Line Items]
Balance at the beginning of the year	(1,100,186)	(1,409,014)
Impairment accounts receivable	(82,543)	308,828
Balance at the end of the year	(1,182,729)	(1,100,186)
Export customers [member]
Trade and Other Receivables [Line Items]
Balance at the beginning of the year	(182,823)	(321,438)
Impairment accounts receivable	(20,353)	111,674
Translation effects	(8,187)	26,941
Balance at the end of the year	$ (211,363)	$ (182,823)

Customers and Other Financing_7

Customers and Other Financing and Non-Financing Accounts Receivable - Summary of Other Accounts Receivable (Detail) $ in Thousands, $ in Thousands	Dec. 31, 2020USD ($)	Dec. 31, 2020MXN ($)	Dec. 31, 2019MXN ($)
Financial assets:
Sundry debtors		$ 28,076,118	$ 27,748,849
Employees and officers		3,539,505	3,667,242
Total financial assets		31,615,623	31,416,091
Non-financial assets:
Taxes to be recovered and prepaid taxes		55,187,272	26,162,225
Special Tax on Production and Services		32,657,743	31,587,018
Advances to suppliers			565,817
Other accounts receivable		1,944,413	1,510,660
Total non-financial assets:	$ 4,501,017	$ 89,789,428	$ 59,825,720

Inventories - Summary of Invent

Inventories - Summary of Inventories (Detail) $ in Thousands, $ in Thousands	Dec. 31, 2020USD ($)	Dec. 31, 2020MXN ($)	Dec. 31, 2019MXN ($)
Disclosure of Inventories [Line Items]
Inventories	$ 2,637,047	$ 52,605,661	$ 82,672,196
Refined and petrochemicals products [member]
Disclosure of Inventories [Line Items]
Inventories		32,175,910	41,211,837
Crude oil [member]
Disclosure of Inventories [Line Items]
Inventories		11,997,570	14,087,218
Materials and products in stock [member]
Disclosure of Inventories [Line Items]
Inventories		4,736,659	4,381,628
Products in transit [member]
Disclosure of Inventories [Line Items]
Inventories		3,476,807	22,719,635
Gas and condesate products [member]
Disclosure of Inventories [Line Items]
Inventories		142,136	144,284
Materials in transit [member]
Disclosure of Inventories [Line Items]
Inventories		$ 76,579	$ 127,594

Investments in Joint Ventures_3

Investments in Joint Ventures and Associates - Schedule of Investments in Joint Ventures and Associates (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)	Dec. 31, 2020MXN ($)	Dec. 31, 2019MXN ($)
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items]
Permanent investments in associates	$ 602,301	$ 12,015,129	$ 14,874,579
Deer Park Refining Limited [member]
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items]
Percentage of investment	49.99%
Permanent investments in associates		9,635,176	12,652,599
Frontera Brownsville, LLC. [member]
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items]
Percentage of investment	50.00%
Permanent investments in associates		479,520	446,202
Texas Frontera, LLC. [member]
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items]
Percentage of investment	50.00%
Permanent investments in associates		197,708	199,923
CH 4 Energa SA De CV [Member]
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items]
Percentage of investment	50.00%
Permanent investments in associates		141,339	192,614
Sierrita Gas Pipeline LLC [member]
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items]
Percentage of investment	35.00%
Permanent investments in associates		1,232,464	1,171,593
Administracion Portuaria Integral de Dos Bocas, S.A. de C.V. [member]
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items]
Percentage of investment	40.00%
Permanent investments in associates		208,152	165,370
Other-net [member]
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items]
Permanent investments in associates		$ 120,770	$ 46,278

Investments in Joint Ventures_4

Investments in Joint Ventures and Associates - Schedule (Loss) profit Sharing in Joint Ventures and Associates (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)	Dec. 31, 2020MXN ($)	Dec. 31, 2019MXN ($)	Dec. 31, 2018MXN ($)
Disclosure of Investments in Associates and Other [Line Items]
(Loss) profit sharing in joint ventures and associates, net	$ (177,482)	$ (3,540,533)	$ (1,157,893)	$ 1,527,012
Sierrita Gas Pipeline LLC [member]
Disclosure of Investments in Associates and Other [Line Items]
(Loss) profit sharing in joint ventures and associates, net		182,805	118,959	124,209
Administracion Portuaria Integral de Dos Bocas, S.A. de C.V. [member]
Disclosure of Investments in Associates and Other [Line Items]
(Loss) profit sharing in joint ventures and associates, net		42,782	46,893	54,149
Ductos el Peninsular, S.A.P.I de C. V. [member]
Disclosure of Investments in Associates and Other [Line Items]
(Loss) profit sharing in joint ventures and associates, net		(1,097)	(17,605)	(1,092)
PMV Minera, S.A. de C.V. [member]
Disclosure of Investments in Associates and Other [Line Items]
(Loss) profit sharing in joint ventures and associates, net				6,863
Petroquimica Mexicana de Vinilo. S. A. de C. V. [member]
Disclosure of Investments in Associates and Other [Line Items]
(Loss) profit sharing in joint ventures and associates, net				352,816
Other-net [member]
Disclosure of Investments in Associates and Other [Line Items]
(Loss) profit sharing in joint ventures and associates, net		179,566		(13,502)
Deer Park Refining Limited [member]
Disclosure of Investments in Associates and Other [Line Items]
(Loss) profit sharing in joint ventures and associates, net		(4,056,037)	(1,438,308)	872,885
Frontera Brownsville, LLC. [member]
Disclosure of Investments in Associates and Other [Line Items]
(Loss) profit sharing in joint ventures and associates, net		55,738	47,719	59,973
Texas Frontera, LLC. [member]
Disclosure of Investments in Associates and Other [Line Items]
(Loss) profit sharing in joint ventures and associates, net		34,486	47,585	55,316
CH4 Energia S.A. de C.V.[member]
Disclosure of Investments in Associates and Other [Line Items]
(Loss) profit sharing in joint ventures and associates, net		$ 21,224	$ 36,864	$ 15,395

Investments in Joint Ventures_5

Investments in Joint Ventures and Associates - Schedule (Loss) profit Sharing in Joint Ventures and Associates (Parenthetical) (Detail) $ in Thousands	1 Months Ended
	Nov. 30, 2018MXN ($)
PMV Minera, S.A. de C.V. [member]
Disclosure of Investments in Associates and Other [Line Items]
Sale of ownership , percentage	44.09%
Divestiture amount	$ 53,701
Gain from divestiture	$ 1,646
Petroquimica Mexicana de Vinilo. S. A. de C. V. [member]
Disclosure of Investments in Associates and Other [Line Items]
Sale of ownership , percentage	44.09%
Divestiture amount	$ 3,198,597
Gain from divestiture	$ 689,268

Investments in Joint Ventures_6

Investments in Joint Ventures and Associates - Schedule of Condensed Financial Information of Major Investments Recognized Under the Equity Method (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)	Dec. 31, 2020MXN ($)	Dec. 31, 2019MXN ($)	Dec. 31, 2018MXN ($)	Dec. 31, 2020MXN ($)	Dec. 31, 2019USD ($)	Dec. 31, 2019MXN ($)	Dec. 31, 2017MXN ($)
Investment In Joint Ventures Accounted For Using Equity Method [line items]
Cash and cash equivalents	$ 2,004,631			$ 81,912,409	$ 39,989,781	$ 3,038,876	$ 60,621,631	$ 97,851,754
Other current assets	175,063				3,492,283		2,829,233
Current assets	16,535,400				329,859,739		343,035,041
Non-current assets	80,136,961				1,598,628,189		1,641,212,039
Total assets	96,672,361				1,928,487,928		1,984,247,080
Other current liabilities					381,312,804		307,279,443
Current liabilities	38,719,820				772,410,071		552,203,628
Other liabilities	245,209				4,891,562		4,397,299
Total liabilities	217,217,913				4,333,214,958		3,915,656,382
Total equity	(120,545,552)			(1,459,405,432)	(2,404,727,030)		(1,931,409,302)	$ (1,502,377,342)
Total liabilities and equity	96,672,361				1,928,487,928		1,984,247,080
Sales and other income	47,805,715	$ 953,661,844	$ 1,401,971,185	1,681,119,150
Depreciation and amortization		129,631,820	137,187,010	153,382,040
Income tax	9,302,464	185,572,075	343,823,489	461,578,223
Net result	$ (25,518,054)	(509,052,065)	(282,112,024)	(180,419,837)
Deer Park Refining Limited [member]
Investment In Joint Ventures Accounted For Using Equity Method [line items]
Cash and cash equivalents					29,504		24,536
Other current assets					294,742		1,476,541
Current assets					324,246		1,501,077
Non-current assets					43,348,665		42,458,405
Total assets					43,672,911		43,959,482
Current financial liabilities					11,617,624		8,008,343
Other current liabilities					523,354		410,524
Current liabilities					12,140,978		8,418,867
Non-current financial liabilities					11,158,305		8,373,280
Other liabilities					1,101,348		1,859,607
Non-current liabilities					12,259,653		10,232,887
Total liabilities					24,400,631		18,651,754
Total equity					19,272,280		25,307,728
Total liabilities and equity					43,672,911		43,959,482
Sales and other income		8,114,474	13,560,847	17,519,219
Costs and expenses		10,770,248	11,775,836	11,159,617
Depreciation and amortization		4,776,575	4,088,972	4,094,308
Interest paid		674,504	565,392	503,978
Income tax		6,028	7,551	15,371
Net result		(8,112,881)	(2,876,904)	1,745,945
Sierrita Gas Pipeline LLC [member]
Investment In Joint Ventures Accounted For Using Equity Method [line items]
Current assets					186,919		331,694
Non-current assets					3,417,052		3,222,956
Total assets					3,603,971		3,554,650
Current liabilities					82,648		207,241
Total liabilities					82,648		207,241
Total equity					3,521,324		3,347,409
Total liabilities and equity					$ 3,603,971		$ 3,554,650
Sales and other income		942,024	669,579	615,150
Costs and expenses		419,729	329,695	260,272
Net result		$ 522,295	$ 339,884	$ 354,878

Investments in Joint Ventures,

Investments in Joint Ventures, Associates and Other - Additional Information (Detail) - Barrels	1 Months Ended
	Jul. 27, 2010	Mar. 31, 1993
Deer Park Refining Limited [member] | PMI NASA [member]
Disclosure of Investments in Associates and Other [Line Items]
Acquired percentage		49.99%
Installed capacity of crude oil per day		340,000
Texas Frontera, LLC. [member]
Disclosure of Investments in Associates and Other [Line Items]
Number of tanks	7
Number of barrels in each tanks	120,000
Texas Frontera, LLC. [member] | PMI SUS [member]
Disclosure of Investments in Associates and Other [Line Items]
Acquired percentage	50.00%

Wells, Pipelines, Properties,_3

Wells, Pipelines, Properties, Plant and Equipment, Net - Detailed Information About Property, Plant and Equipment (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)	Dec. 31, 2020MXN ($)		Dec. 31, 2019MXN ($)
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance		$ 1,277,548,562
Reclassifications				$ 65,799,060
Ending balance	$ 63,970,561	1,276,129,521		1,277,548,562
Carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance		3,267,177,099		3,264,155,248
Transfers to rights of use				(7,005,141)
Acquisitions		169,864,041		129,289,654
Reclassifications		(1,534,443)		(1,893,607)
Unsuccessful wells				(77,153,952)
(Impairment)		(159,940,332)		(224,438,358)
Reversal of impairment		123,586,632		193,155,204
Disposals		(18,515,877)		(8,931,949)
Ending balance		3,380,637,120		3,267,177,099
Accumulated depreciation and amortization [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance		(1,989,628,537)		(1,861,669,164)
Transfers to rights of use				943,639
Depreciation and amortization		(129,631,820)		(137,187,010)
Reclassifications		1,534,443		1,893,607
Disposals		13,218,315		6,390,391
Ending balance		(2,104,507,599)		(1,989,628,537)
Plants [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance		367,376,164
Ending balance		291,122,824		367,376,164
Plants [member] | Carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance		848,841,327		811,270,391
Acquisitions		13,934,129		8,337,019
Reclassifications		(1,446,201)		(1,381,310)
Capitalization		9,906,725		6,830,064
(Impairment)		(66,031,126)		(21,207,717)
Reversal of impairment		9,797,281		48,389,246
Disposals		(3,297,113)		(3,396,366)
Ending balance		811,705,022		848,841,327
Plants [member] | Accumulated depreciation and amortization [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance		(481,465,163)		(436,603,123)
Depreciation and amortization		(42,071,837)		(49,473,592)
Reclassifications		1,782,525		1,303,186
Disposals		1,172,277		3,308,366
Ending balance		$ (520,582,198)		(481,465,163)
Plants [member] | Bottom of range [member]
Disclosure of detailed information about property, plant and equipment [line items]
Depreciation rates	3.00%	3.00%
Estimated useful lives	20 years	20 years
Plants [member] | Top of range [member]
Disclosure of detailed information about property, plant and equipment [line items]
Depreciation rates	5.00%	5.00%
Estimated useful lives	35 years	35 years
Drilling equipment
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance		$ 7,575,375
Ending balance		$ 7,590,189		7,575,375
Depreciation rates	5.00%	5.00%
Estimated useful lives	20 years	20 years
Drilling equipment | Carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance		$ 13,092,824		20,080,965
Transfers to rights of use				(7,005,141)
Acquisitions		246,351		252,382
Reversal of impairment		153,456
Disposals				(235,382)
Ending balance		13,492,631		13,092,824
Drilling equipment | Accumulated depreciation and amortization [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance		(5,517,449)		(5,998,481)
Transfers to rights of use				943,639
Depreciation and amortization		(384,993)		(591,168)
Disposals				128,561
Ending balance		(5,902,442)		(5,517,449)
Pipelines [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance		271,515,781
Ending balance		280,815,336		271,515,781
Pipelines [member] | Carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance		460,935,077		421,235,950
Acquisitions		1,911,502		1,251,488
Reclassifications		228,056		428,738
Capitalization		19,022,425		6,538,540
(Impairment)		(9,392,862)		(53,718,547)
Reversal of impairment		11,943,047		85,500,267
Disposals		(2,855,580)		(301,359)
Ending balance		481,791,665		460,935,077
Pipelines [member] | Accumulated depreciation and amortization [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance		(189,419,296)		(173,264,040)
Depreciation and amortization		(14,042,861)		(16,380,653)
Reclassifications		(90,590)		41,225
Disposals		2,576,418		184,172
Ending balance		$ (200,976,329)		(189,419,296)
Pipelines [member] | Bottom of range [member]
Disclosure of detailed information about property, plant and equipment [line items]
Depreciation rates	2.00%	2.00%
Estimated useful lives	15 years	15 years
Pipelines [member] | Top of range [member]
Disclosure of detailed information about property, plant and equipment [line items]
Depreciation rates	7.00%	7.00%
Estimated useful lives	45 years	45 years
Wells [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance		$ 278,627,485
Ending balance		305,861,446		278,627,485
Wells [member] | Carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance		1,303,668,946		1,379,323,723
Acquisitions		15,602,539		29,072,723
Unsuccessful wells				(69,231,587)
Capitalization		42,183,243		35,251,706
(Impairment)		(48,028,474)		(101,683,066)
Reversal of impairment		73,801,995		31,086,852
Disposals				(151,405)
Ending balance		1,387,228,249		1,303,668,946
Wells [member] | Accumulated depreciation and amortization [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance		(1,025,041,461)		(973,467,746)
Depreciation and amortization		(56,325,342)		(51,574,532)
Disposals				817
Ending balance		(1,081,366,803)		(1,025,041,461)
Buildings
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance		19,694,064
Ending balance		20,418,199		19,694,064
Buildings | Carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance		63,318,227		64,845,163
Acquisitions		1,118,794		316,499
Reclassifications		361,131		(51,885)
Capitalization		616,006		143,312
(Impairment)		(65,964)		(500,745)
Reversal of impairment		1,563,299		1,023
Disposals		(6,599,754)		(1,435,140)
Ending balance		60,311,739		63,318,227
Buildings | Accumulated depreciation and amortization [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance		(43,624,163)		(42,924,256)
Depreciation and amortization		(1,989,834)		(2,131,913)
Reclassifications		(103,562)		205,661
Disposals		5,824,019		1,226,345
Ending balance		$ (39,893,540)		(43,624,163)
Buildings | Bottom of range [member]
Disclosure of detailed information about property, plant and equipment [line items]
Depreciation rates	3.00%	3.00%
Estimated useful lives	33 years	33 years
Buildings | Top of range [member]
Disclosure of detailed information about property, plant and equipment [line items]
Depreciation rates	7.00%	7.00%
Estimated useful lives	35 years	35 years
Offshore platforms [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance		$ 132,947,855
Ending balance		$ 150,114,565		132,947,855
Depreciation rates	4.00%	4.00%
Estimated useful lives	25 years	25 years
Offshore platforms [member] | Carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance		$ 326,482,942		326,482,265
Acquisitions		3,696,726		5,436,425
Reclassifications				(614,430)
Capitalization		15,695,486		13,013,199
(Impairment)		(16,210,995)		(43,001,652)
Reversal of impairment		25,872,979		25,167,135
Disposals		(1,184,109)
Ending balance		354,353,029		326,482,942
Offshore platforms [member] | Accumulated depreciation and amortization [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance		(193,535,087)		(179,831,090)
Depreciation and amortization		(11,671,929)		(13,820,275)
Reclassifications				116,278
Disposals		968,552
Ending balance		(204,238,464)		(193,535,087)
Furniture and equipment [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance		7,359,605
Ending balance		5,492,140		7,359,605
Furniture and equipment [member] | Carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance		50,407,562		52,020,042
Acquisitions		294,329		184,863
Reclassifications		410,240		(234,643)
Capitalization		8,835		2,566
Reversal of impairment		8,159
Disposals		(2,300,115)		(1,565,266)
Ending balance		48,829,010		50,407,562
Furniture and equipment [member] | Accumulated depreciation and amortization [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance		(43,047,957)		(42,161,378)
Depreciation and amortization		(2,249,987)		(2,556,539)
Reclassifications		(203,053)		220,301
Disposals		2,164,127		1,449,659
Ending balance		$ (43,336,870)		(43,047,957)
Furniture and equipment [member] | Bottom of range [member]
Disclosure of detailed information about property, plant and equipment [line items]
Depreciation rates	3.00%	3.00%
Estimated useful lives	3 years	3 years
Furniture and equipment [member] | Top of range [member]
Disclosure of detailed information about property, plant and equipment [line items]
Depreciation rates	10.00%	10.00%
Estimated useful lives	10 years	10 years
Transportation equipment [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance		$ 8,377,257
Ending balance		8,618,579		8,377,257
Transportation equipment [member] | Carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance		16,355,218		15,159,952
Acquisitions		552,865		1,735,581
Reclassifications		7,586		47,110
Capitalization		1,532		955,134
(Impairment)				(2,076,680)
Reversal of impairment		426,560		646,603
Disposals		(514,229)		(112,482)
Ending balance		16,829,532		16,355,218
Transportation equipment [member] | Accumulated depreciation and amortization [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance		(7,977,961)		(7,419,050)
Depreciation and amortization		(895,037)		(658,338)
Reclassifications		149,123		6,956
Disposals		512,922		92,471
Ending balance		$ (8,210,953)		(7,977,961)
Transportation equipment [member] | Bottom of range [member]
Disclosure of detailed information about property, plant and equipment [line items]
Depreciation rates	4.00%	4.00%
Estimated useful lives	5 years	5 years
Transportation equipment [member] | Top of range [member]
Disclosure of detailed information about property, plant and equipment [line items]
Depreciation rates	20.00%	20.00%
Estimated useful lives	25 years	25 years
Construction in progress [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance		$ 139,925,440	[1]
Ending balance		161,870,424	[1]	139,925,440	[1]
Construction in progress [member] | Carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance		139,925,440	[1]	129,352,513	[1]
Acquisitions		131,963,334	[1]	82,520,111	[1]
Reclassifications		(1,234,963)	[1]	(106,429)	[1]
Unsuccessful wells				(7,922,365)	[1]
Capitalization		(87,150,784)	[1]	(62,722,409)	[1]
(Impairment)		(20,210,911)		(2,249,951)
Reversal of impairment		19,856		2,364,078	[1]
Disposals		(1,441,548)	[1]	(1,310,108)	[1]
Ending balance		161,870,424	[1]	139,925,440	[1]
Lands
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance		44,149,536
Ending balance		44,225,819		44,149,536
Lands | Carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance		44,149,536		44,351,625
Acquisitions		543,472		182,563
Reclassifications		115,107		(16,161)
Capitalization		(283,468)		(12,112)
Disposals		(298,828)		(356,379)
Ending balance		44,225,819		44,149,536
Unproductive fixed assets [member] | Carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Reclassifications		24,601		35,403
Disposals		$ (24,601)		(35,403)
Other Fixed Assets [member] | Carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance				32,659
Disposals				$ (32,659)
Ending balance
[1]	Mainly wells, pipelines and plants.

Wells, Pipelines, Properties,_4

Wells, Pipelines, Properties, Plant and Equipment, Net - Detailed Information About Property, Plant and Equipment (Parenthetical) (Detail) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of detailed information about property, plant and equipment [line items]
Depreciation and amortization	$ 129,631,820	$ 137,187,010	$ 153,382,040
Plugging and abandonment cost	2,731,317	4,700,151	983,438
Provisions for plugging wells	77,125,513	80,849,900
Non-financial assets held for sale reclassified to fixed assets	1,072,537
Transfers from wells unassigned to a reserve	6,229,356	5,986,055	6,726,769
Net impairment	(36,353,700)	(31,283,154)	21,418,997
Revaluation increase (decrease), property, plant and equipment		65,799,060
Increase (decrease) through net exchange differences, property, plant and equipment	490,203	(1,776,684)	(238,422)
Pemex exploration and production [member]
Disclosure of detailed information about property, plant and equipment [line items]
Financing cost	$ 3,893,248	$ 2,959,025	$ 2,198,191
Pemex exploration and production [member] | Bottom of range [member]
Disclosure of detailed information about property, plant and equipment [line items]
Financing costs rates	5.75%	5.27%	4.94%
Pemex exploration and production [member] | Top of range [member]
Disclosure of detailed information about property, plant and equipment [line items]
Financing costs rates	7.08%	6.84%	6.07%
Oil and gas production assets [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Plugging and abandonment cost	$ 101,339,417	$ 103,173,593	$ 124,790,099

Wells, Pipelines, Properties,_5

Wells, Pipelines, Properties, Plant and Equipment, Net - Summary of Net Impairment (Detail) $ in Thousands, $ in Thousands		12 Months Ended
		Dec. 31, 2020USD ($)	Dec. 31, 2020MXN ($)	Dec. 31, 2019MXN ($)	Dec. 31, 2018MXN ($)
Disclosure of detailed information about property, plant and equipment [line items]
Impairment			$ (103,736,696)	$ (139,056,243)	$ (121,295,334)
Reversal of impairment			67,382,996	107,773,089	142,714,331
(Impairment) / Reversal of impairment, net		$ (1,822,359)	(36,353,700)	(31,283,154)	21,418,997
Pemex industrial transformation [member]
Disclosure of detailed information about property, plant and equipment [line items]
Impairment			(71,761,571)	(1,275,480)	(13,788,470)
Reversal of impairment				43,519,422	14,448,080
(Impairment) / Reversal of impairment, net			(71,761,571)	42,243,942	659,610
Pemex exploration and production [member]
Disclosure of detailed information about property, plant and equipment [line items]
Impairment	[1]		(31,882,681)	(133,523,711)	(63,252,635)
Reversal of impairment	[1]		66,914,222	29,487,824	128,266,251
(Impairment) / Reversal of impairment, net	[1]		35,031,541	(104,035,887)	65,013,616
Pemex logistics [member]
Disclosure of detailed information about property, plant and equipment [line items]
Impairment					(40,288,338)
Reversal of impairment			426,560	34,119,240	(40,288,388)
(Impairment) / Reversal of impairment, net			426,560	34,119,240	(40,288,338)
Pemex Fertilizers [member]
Disclosure of detailed information about property, plant and equipment [line items]
Impairment			(92,444)	(2,298,775)	(2,246,264)
(Impairment) / Reversal of impairment, net			(92,444)	(2,298,775)	(2,246,264)
PMI Azufre Industrial [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Impairment				(796,263)
Reversal of impairment			42,214
(Impairment) / Reversal of impairment, net			$ 42,214	(796,263)
PMI NASA [member]
Disclosure of detailed information about property, plant and equipment [line items]
Impairment				(1,162,014)	(1,719,627)
Reversal of impairment				646,603
(Impairment) / Reversal of impairment, net				$ (515,411)	$ (1,719,627)
[1]	See Note 4 for the correction of error in the impairment of Pemex- Exploration and Production CGUs for 65,799,060.

Wells, Pipelines, Properties,_6

Wells, Pipelines, Properties, Plant and Equipment, Net - Summary of Net Impairment (Parenthetical) (Detail) $ in Thousands, $ in Thousands		12 Months Ended
		Dec. 31, 2020USD ($)	Dec. 31, 2020MXN ($)	Dec. 31, 2019MXN ($)	Dec. 31, 2018MXN ($)
Disclosure of detailed information about property, plant and equipment [line items]
Impairment (reversal) Of property plant and equipment		$ (1,822,359)	$ (36,353,700)	$ (31,283,154)	$ 21,418,997
Pemex exploration and production [member]
Disclosure of detailed information about property, plant and equipment [line items]
Impairment (reversal) Of property plant and equipment	[1]		35,031,541	$ (104,035,887)	$ 65,013,616
Pemex exploration and production [member] | Cash-generating units [member]
Disclosure of detailed information about property, plant and equipment [line items]
Impairment (reversal) Of property plant and equipment			$ 65,799,060
[1]	See Note 4 for the correction of error in the impairment of Pemex- Exploration and Production CGUs for 65,799,060.

Wells, Pipelines, Properties,_7

Wells, Pipelines, Properties, Plant and Equipment, Net - Additional Information (Detail) $ in Thousands, $ in Thousands		12 Months Ended
		Dec. 31, 2020USD ($)Exchange_Rate	Dec. 31, 2020MXN ($)Exchange_Rate	Dec. 31, 2019MXN ($)Exchange_Rate	Dec. 31, 2018MXN ($)Exchange_Rate	Dec. 31, 2017MXN ($)	Dec. 31, 2020MXN ($)
Disclosure of detailed information about property, plant and equipment [line items]
Impairment (reversal of impairment) of wells, pipelines, properties, plant and equipment, net		$ (1,822,359)	$ (36,353,700)	$ (31,283,154)	$ 21,418,997
Impairment			(103,736,696)	(139,056,243)	(121,295,334)
Reversal of impairment			67,382,996	107,773,089	142,714,331
Right-of-use assets		$ 2,967,374		70,818,314	$ 72,760,580		$ 59,195,257
Replacement cost			$ 1,476,218
Drilling equipment
Disclosure of detailed information about property, plant and equipment [line items]
Right-of-use assets				6,223,655
Exploration and extraction contracts [member]
Disclosure of detailed information about property, plant and equipment [line items]
Impairment				$ (9,477,854)
Cash generating units of fertilizers [member]
Disclosure of detailed information about property, plant and equipment [line items]
Discount rate		9.51%	9.51%	10.15%	8.92%
Impairment			$ (92,444)	$ (2,298,775)	$ (2,246,264)
Cash Generating Units of PMI NASA [member]
Disclosure of detailed information about property, plant and equipment [line items]
Impairment				$ (515,411)	(1,719,627)
Discount rate		15.81%	15.81%	16.94%
Average useful life		17 years	17 years
Recoverable amount of the flotels			$ 3,747,142
Advance of production in Cantarell [member]
Disclosure of detailed information about property, plant and equipment [line items]
Reversal of impairment					98,673,388
Crudo Ligero Marino projects [member]
Disclosure of detailed information about property, plant and equipment [line items]
Impairment					(58,318,030)
Cash Generating Unit of Pemex Azufre Industrial [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Impairment				$ (796,263)
Reversal of impairment			42,214
Flotel Reforma Pemex [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Impairment				(1,146,278)
Cerro de la Pez Flotel [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Reversal of impairment				630,866
Pemex exploration and production [member]
Disclosure of detailed information about property, plant and equipment [line items]
Impairment (reversal of impairment) of wells, pipelines, properties, plant and equipment, net	[1]		$ 35,031,541	$ (104,035,887)	$ 65,013,616
Discount rate		6.23%	6.23%	6.18%	7.03%
Impairment	[1]		$ (31,882,681)	$ (133,523,711)	$ (63,252,635)
Reversal of impairment	[1]		$ 66,914,222	$ 29,487,824	$ 128,266,251
Tax rate					30.00%
Operating profit with economic limit					25 years
Percentage of operating profit with economic limit					14.40%
Net benefit on operating profit					$ 29,592,863
Useful life		25 years	25 years
Foreign exchange rate		3,844,410	3,844,410	18.8452	19.6829	19.7867
Negative Effect From Decrease In Production				$ (225,019,093)
Negative Effect From Decrease In Prices				(58,110,000)
Negative Effect From Decrease In Exchange Rate				(15,307,000)
Increase Decrease In Discount			$ 74,428,069	120,821,000
Net benefit from lower income in production profile				17,258,000
Positive Effect From Decrease In Production			50,763,557
Effect Of Increase Decrease In Volume Of Crude Oil			33,784,306
Positive Effect Due To Increase Decrease In Exchange Rate Amount			$ 21,067,337
Pemex exploration and production [member] | Ek Balam block [member]
Disclosure of detailed information about property, plant and equipment [line items]
Percentage of contractual area		100.00%	100.00%
Pemex exploration and production [member] | Exploration and extraction contracts [member] | Block 16 of Tampico Misantla [member]
Disclosure of detailed information about property, plant and equipment [line items]
Percentage of contractual area		40.00%	40.00%
Pemex exploration and production [member] | Exploration and extraction contracts [member] | Block 17 of Tampico Misantla [member]
Disclosure of detailed information about property, plant and equipment [line items]
Percentage of contractual area		40.00%	40.00%
Pemex exploration and production [member] | Exploration and extraction contracts [member] | Block 18 of Tampico Misantla [member]
Disclosure of detailed information about property, plant and equipment [line items]
Percentage of production area		80.00%	80.00%
Pemex exploration and production [member] | Exploration and extraction contracts [member] | Block 29 Cuenca del Sureste [member]
Disclosure of detailed information about property, plant and equipment [line items]
Percentage of contractual area		100.00%	100.00%
Pemex exploration and production [member] | Exploration and extraction contracts [member] | Block 32 Cuenca del Sureste [member]
Disclosure of detailed information about property, plant and equipment [line items]
Percentage of production area		50.00%	50.00%
Pemex exploration and production [member] | Exploration and extraction contracts [member] | Block 33 Cuenca del Sureste [member]
Disclosure of detailed information about property, plant and equipment [line items]
Percentage of production area		50.00%	50.00%
Pemex exploration and production [member] | Exploration and extraction contracts [member] | Block 35 Cuenca del Sureste [member]
Disclosure of detailed information about property, plant and equipment [line items]
Percentage of production area		50.00%	50.00%
Pemex exploration and production [member] | Exploration and extraction contracts [member] | Santuario y El Golpe [member]
Disclosure of detailed information about property, plant and equipment [line items]
Percentage of production area		64.00%	64.00%
Pemex exploration and production [member] | Exploration and extraction contracts [member] | Mision block [member]
Disclosure of detailed information about property, plant and equipment [line items]
Percentage of production area		51.00%	51.00%
Pemex exploration and production [member] | Exploration and extraction contracts [member] | Ebano [member]
Disclosure of detailed information about property, plant and equipment [line items]
Percentage of production area		45.00%	45.00%
Pemex exploration and production [member] | Exploration and extraction contracts [member] | Block 2 of Tampico Misantla [member]
Disclosure of detailed information about property, plant and equipment [line items]
Percentage of contractual area		50.00%	50.00%
Pemex exploration and production [member] | Exploration and extraction contracts [member] | Block 8 Cuenca del Sureste [member]
Disclosure of detailed information about property, plant and equipment [line items]
Percentage of contractual area		50.00%	50.00%
Pemex exploration and production [member] | Licenses [member] | Block Three [member]
Disclosure of detailed information about property, plant and equipment [line items]
Percentage of contract behalf		27.50%	27.50%
Pemex exploration and production [member] | Licenses [member] | Eighteen, Cordilleras Mexicanas [member]
Disclosure of detailed information about property, plant and equipment [line items]
Percentage of contractual area		100.00%	100.00%
Pemex exploration and production [member] | Licenses [member] | Twenty two cuenca salina [member]
Disclosure of detailed information about property, plant and equipment [line items]
Percentage of contractual area		27.50%	27.50%
Pemex exploration and production [member] | Licenses [member] | Block Trion [member]
Disclosure of detailed information about property, plant and equipment [line items]
Percentage of contractual area		60.00%	60.00%
Pemex exploration and production [member] | Licenses [member] | Cardenas Mora [member]
Disclosure of detailed information about property, plant and equipment [line items]
Percentage of contractual area		50.00%	50.00%
Pemex exploration and production [member] | Licenses [member] | Ogarrio field [member]
Disclosure of detailed information about property, plant and equipment [line items]
Percentage of contractual area		50.00%	50.00%
Pemex exploration and production [member] | Licenses [member] | Miquetla [member]
Disclosure of detailed information about property, plant and equipment [line items]
Percentage of contractual area		49.00%	49.00%
Pemex exploration and production [member] | Licenses [member] | Plegado Perdido block five [member]
Disclosure of detailed information about property, plant and equipment [line items]
Percentage of contractual area		100.00%	100.00%
Pemex exploration and production [member] | Cash generating units of fertilizers [member]
Disclosure of detailed information about property, plant and equipment [line items]
Impairment				(104,035,887)
Pemex exploration and production [member] | Refining [member]
Disclosure of detailed information about property, plant and equipment [line items]
Percentage of decrease in discount rate					0.10%
Pemex exploration and production [member] | Gas [member]
Disclosure of detailed information about property, plant and equipment [line items]
Percentage of decrease in discount rate					8.10%
Pemex industrial transformation [member]
Disclosure of detailed information about property, plant and equipment [line items]
Impairment (reversal of impairment) of wells, pipelines, properties, plant and equipment, net			$ (71,761,571)	$ 42,243,942	$ 659,610
Discount rate		6.23%	6.23%	6.18%	7.03%
Impairment			$ (71,761,571)	$ (1,275,480)	$ (13,788,470)
Reversal of impairment				$ 43,519,422	$ 14,448,080
Pemex industrial transformation [member] | Refining [member]
Disclosure of detailed information about property, plant and equipment [line items]
Discount rate		10.83%	10.83%	11.47%	11.52%
Foreign exchange rate | Exchange_Rate		19.9487	19.9487	18.8452	19.6829
Percentage of increase in discount rate				0.03%
Percentage of decrease in discount rate		0.64%	0.64%
Pemex industrial transformation [member] | Gas [member]
Disclosure of detailed information about property, plant and equipment [line items]
Discount rate		9.76%	9.76%	10.22%	10.22%
Foreign exchange rate | Exchange_Rate		19.9487	19.9487	18.8452	19.68
Percentage of increase in discount rate				0.09%
Percentage of decrease in discount rate		0.46%	0.46%
Pemex industrial transformation [member] | Petrochemicals [member]
Disclosure of detailed information about property, plant and equipment [line items]
Discount rate		9.76%	9.76%	8.61%	8.92%
Foreign exchange rate | Exchange_Rate		19.9487	19.9487	18.8452	19.6829
Percentage of increase in discount rate		1.15%	1.15%	0.06%
Pemex industrial transformation [member] | Ethylene [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Discount rate				8.03%
Foreign exchange rate | Exchange_Rate				18.8452
Percentage of increase in discount rate		0.26%	0.26%	0.50%
DEUTSCHE Erdoel Mxico S. de R.L. de C.V. [member] | Exploration and extraction contracts [member] | Block 16 of Tampico Misantla [member]
Disclosure of detailed information about property, plant and equipment [line items]
Percentage of contractual area		40.00%	40.00%
DEUTSCHE Erdoel Mxico S. de R.L. de C.V. [member] | Exploration and extraction contracts [member] | Block 17 of Tampico Misantla [member]
Disclosure of detailed information about property, plant and equipment [line items]
Percentage of contractual area		40.00%	40.00%
CEPSA E.P. Mxico S. de R.L. de C.V [member] | Exploration and extraction contracts [member] | Block 16 of Tampico Misantla [member]
Disclosure of detailed information about property, plant and equipment [line items]
Percentage of contractual area		20.00%	20.00%
CEPSA E.P. Mxico S. de R.L. de C.V [member] | Exploration and extraction contracts [member] | Block 17 of Tampico Misantla [member]
Disclosure of detailed information about property, plant and equipment [line items]
Percentage of contractual area		20.00%	20.00%
CEPSA E.P. Mxico S. de R.L. de C.V [member] | Exploration and extraction contracts [member] | Block 18 of Tampico Misantla [member]
Disclosure of detailed information about property, plant and equipment [line items]
Percentage of production area		20.00%	20.00%
PETROFAC [member] | Exploration and extraction contracts [member] | Santuario y El Golpe [member]
Disclosure of detailed information about property, plant and equipment [line items]
Percentage of production area		36.00%	36.00%
Servicios Mltiples de Burgos [member] | Exploration and extraction contracts [member] | Mision block [member]
Disclosure of detailed information about property, plant and equipment [line items]
Percentage of production area		49.00%	49.00%
Servicios Mltiples de Burgos [member] | Exploration and extraction contracts [member] | Ebano [member]
Disclosure of detailed information about property, plant and equipment [line items]
Percentage of production area		54.99%	54.99%
D&S Petroleum S.A. de C.V. [member] | Exploration and extraction contracts [member] | Ebano [member]
Disclosure of detailed information about property, plant and equipment [line items]
Percentage of production area		0.01%	0.01%
Chevron [member] | Licenses [member] | Block Three [member]
Disclosure of detailed information about property, plant and equipment [line items]
Percentage of contract behalf		37.50%	37.50%
Chevron [member] | Licenses [member] | Twenty two cuenca salina [member]
Disclosure of detailed information about property, plant and equipment [line items]
Percentage of contractual area		37.50%	37.50%
Inpex [member] | Licenses [member] | Block Three [member]
Disclosure of detailed information about property, plant and equipment [line items]
Percentage of contract behalf		35.00%	35.00%
Inpex [member] | Licenses [member] | Twenty two cuenca salina [member]
Disclosure of detailed information about property, plant and equipment [line items]
Percentage of contractual area		35.00%	35.00%
BHP Billiton [member] | Licenses [member] | Block Trion [member]
Disclosure of detailed information about property, plant and equipment [line items]
Percentage of contractual area		40.00%	40.00%
Petrolera Cardenas Mora, S. A. P. I. de C. V. [member] | Licenses [member] | Cardenas Mora [member]
Disclosure of detailed information about property, plant and equipment [line items]
Percentage of contractual area		50.00%	50.00%
DEA Erdoel [member] | Licenses [member] | Ogarrio field [member]
Disclosure of detailed information about property, plant and equipment [line items]
Percentage of contractual area		50.00%	50.00%
Operadora de Campos DWF, S.A. de C.V. [member] | Licenses [member] | Miquetla [member]
Disclosure of detailed information about property, plant and equipment [line items]
Percentage of contractual area		51.00%	51.00%
Shell Exploracion y Extraccion de Mxico, S.A. de C.V..[member] | Licenses [member] | Plegado Perdido block two [member]
Disclosure of detailed information about property, plant and equipment [line items]
Percentage of contractual area		50.00%	50.00%
Pemex logistics [member]
Disclosure of detailed information about property, plant and equipment [line items]
Impairment (reversal of impairment) of wells, pipelines, properties, plant and equipment, net			$ 426,560	$ 34,119,240	$ (40,288,338)
Decrease in income flows projection					46.00%
Annual average income					$ 25,271,404	$ 47,219,903
Percentage of increase in cost of non-operating losses					40.00%
Percentage of decrease in direct operating costs					58.00%
Annual average cost of direct operating costs					$ 6,880,967	$ 16,485,969
Discount rate		11.97%	11.97%	11.94%	13.55%	15.41%
Impairment					$ (40,288,338)
Reversal of impairment			$ 426,560	$ 34,119,240	(40,288,388)
Cost Of Losses From Fuel Substraction				$ 4,644,846	$ 39,388,055
[1]	See Note 4 for the correction of error in the impairment of Pemex- Exploration and Production CGUs for 65,799,060.

Wells, pipelines, properties,_8

Wells, pipelines, properties, plant and equipment, net - Summary of Impairment in Cash Generating Units (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)	Dec. 31, 2020MXN ($)	Dec. 31, 2019USD ($)	Dec. 31, 2019MXN ($)	Dec. 31, 2018USD ($)	Dec. 31, 2018MXN ($)
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]
Reversal of impairment		$ 67,382,996		$ 107,773,089		$ 142,714,331
Impairment		(103,736,696)		(139,056,243)		(121,295,334)
Net (impairment) reversal of impairment		(36,353,700)		(31,283,154)		21,418,997
Pemex industrial transformation [member]
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]
Reversal of impairment				43,519,422		14,448,080
Impairment		(71,761,571)		(1,275,480)		(13,788,470)
Net (impairment) reversal of impairment	$ 71,761,571	197,332,486	$ 42,243,942	144,971,590	$ 659,610	124,787,942
Pemex industrial transformation [member] | Salina Cruz Refinery [member]
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]
Reversal of impairment				13,535,526
Impairment						(7,955,528)
Net (impairment) reversal of impairment		30,422,588				9,428,152
Pemex industrial transformation [member] | Minatitln Refinery [member]
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]
Reversal of impairment				9,391,433		14,448,080
Impairment		37,432,703
Net (impairment) reversal of impairment		18,819,247		61,673,158		54,846,565
Pemex industrial transformation [member] | Madero Refinery [member]
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]
Reversal of impairment				7,721,233
Impairment		(18,412,687)				(733,307)
Net (impairment) reversal of impairment		6,799,072		27,840,687		21,083,328
Pemex industrial transformation [member] | Morelos Petrochemical complex [member]
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]
Reversal of impairment				7,547,233
Impairment		(2,048,039)
Pemex industrial transformation [member] | Cangrejera Petrochemical Center [member]
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]
Reversal of impairment				3,143,924
Impairment		(1,484,489)
Pemex industrial transformation [member] | Pajaritos Petrochemical Complex [member]
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]
Impairment				(1,275,480)
Pemex industrial transformation [member] | Tula Refinery [member]
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]
Reversal of impairment				2,180,073
Impairment		(2,820,750)				(5,099,635)
Net (impairment) reversal of impairment		34,829,922		40,450,717		39,429,897
Pemex industrial transformation [member] | Salamanca Refinery [Member]
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]
Impairment		(5,386,525)
Net (impairment) reversal of impairment		44,777,784
Pemex industrial transformation [member] | Casereita Refinery [Member]
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]
Impairment		(2,083,755)
Pemex industrial transformation [member] | New Pemex Gas Processor Complex [Member]
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]
Impairment		(1,080,831)
Pemex industrial transformation [member] | Morelos Ethylene Processor Complex [Member]
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]
Impairment		(302,665)
Pemex industrial transformation [member] | Ciudad Pemex Gas Processing Complex [Member]
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]
Impairment		(709,127)
Pemex Logistics [member]
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]
Reversal of impairment		426,560		34,119,240		(40,288,388)
Impairment						(40,288,338)
Pemex Logistics [member] | Vessel [Member]
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]
Reversal of impairment		303,516
Pemex Logistics [member] | Land transport (white pipelines) [Member]
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]
Reversal of impairment		$ 123,044
Pemex Logistics [member] | Pipelines [Member]
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]
Reversal of impairment				$ 34,119,240
Impairment						$ (40,288,338)

Wells, Pipelines, Properties,_9

Wells, Pipelines, Properties, Plant and Equipment, Net - Assumptions to Determine Net Present Value of Reserves Long Lived Assets (Detail)	12 Months Ended
	Dec. 31, 2020USD ($)Exchange_Rate	Dec. 31, 2019USD ($)Exchange_Rate	Dec. 31, 2018USD ($)Exchange_Rate	Dec. 31, 2017
Pemex industrial transformation [member]
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Discount rate	6.23%	6.18%	7.03%
Average crude oil price | $	$ 52.96	$ 48.69	$ 58.02
Average gas price | $	5.21	5.07	4.89
Average condensates price | $	$ 61.09	$ 57.67	$ 43.21
Pemex Fertilizes [member]
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Useful lives of the cash generating units	22 years	23 years	26 years
Discount rate	9.51%	10.15%	8.92%
Rate of U.S. dollar	19.9487	18.8452	19.6829
Pemex Logistics [member]
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Discount rate	11.97%	11.94%	13.55%	15.41%
Pemex Logistics [member] | Pipelines [Member]
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Useful lives of the cash generating units	22 years	23 years	26 years
Discount rate	11.97%	11.94%	13.55%
Pemex Logistics [member] | Landing transport [Member]
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Useful lives of the cash generating units	5 years	5 years	6 years
Discount rate	11.97%	11.94%	13.55%
Pemex Logistics [member] | Vessel [Member]
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Useful lives of the cash generating units	19 years	19 years	21 years
Discount rate	11.97%	11.94%	13.55%
Gas [member] | Pemex industrial transformation [member]
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Processed volume	2,134	2,056	2,717
Useful lives of the cash generating units	7 years	7 years	8 years
Discount rate	9.76%	10.22%	10.22%
Period	2020-2027	2020-2027	2019-2027
Rate of U.S. dollar	19.9487	18.8452	19.68
Petrochemicals [member] | Pemex industrial transformation [member]
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Useful lives of the cash generating units	7 years	7 years	7 years
Discount rate	9.76%	8.61%	8.92%
Period	2020-2027	2020-2027	2019-2026
Rate of U.S. dollar	19.9487	18.8452	19.6829
Refining [member] | Pemex industrial transformation [member]
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Processed volume	920	723	680
Useful lives of the cash generating units	12 years	12 years	14 years
Discount rate	10.83%	11.47%	11.52%
Period	2020-2032	2020-2032	2019-2034
Average crude oil price | $	$ 48.89	$ 54.13	$ 53.98
Rate of U.S. dollar	19.9487	18.8452	19.6829
Ethylene [Member] | Pemex industrial transformation [member]
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Useful lives of the cash generating units		6 years
Discount rate		8.03%
Period		2020-2026
Rate of U.S. dollar		18.8452

Wells, Pipelines, Properties_10

Wells, Pipelines, Properties, Plant and Equipment, Net - Summary of the net reversal of impairment of cash generating units as follows (Detail) - MXN ($) $ in Thousands		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]
Reversal of impairment		$ 67,382,996	$ 107,773,089	$ 142,714,331
Impairment		(103,736,696)	(139,056,243)	(121,295,334)
Impairment (reversal of impairment)		(36,353,700)	(31,283,154)	21,418,997
Pemex Exploration And Production [member]
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]
Reversal of impairment	[1]	66,914,222	29,487,824	128,266,251
Impairment	[1]	(31,882,681)	(133,523,711)	(63,252,635)
Reversal of impairment (Impairment), net		35,031,541	(104,035,887)	65,013,616
Impairment (reversal of impairment)		351,554,775	411,836,519	399,563,000
Pemex Exploration And Production [member] | Aceite Terciario del Golfo [Member]
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]
Reversal of impairment		29,954,188		29,592,864
Impairment			(46,284,407)
Impairment (reversal of impairment)		39,947,448	12,667,016	80,713,000
Pemex Exploration And Production [member] | Cantarell [Member]
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]
Reversal of impairment		23,218,889		98,673,388
Impairment			(48,664,886)
Impairment (reversal of impairment)		125,953,979	101,446,620	157,526,000
Pemex Exploration And Production [member] | Burgos [Member]
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]
Reversal of impairment		9,084,982	7,929,552
Impairment				(10,542,238)
Impairment (reversal of impairment)		17,487,412	10,731,645	2,124,000
Pemex Exploration And Production [member] | Tsimin Xux [Member]
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]
Reversal of impairment		3,920,244		627,426
Impairment			(1,062,635)
Impairment (reversal of impairment)		25,910,556	28,116,300	38,152,000
Pemex Exploration And Production [member] | Cuenca de Macuspana [Member]
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]
Reversal of impairment		735,919
Impairment			(166,013)	(1,343,836)
Impairment (reversal of impairment)		1,096,972	432,365	680,000
Pemex Exploration And Production [member] | Crudo Ligero Marino [Member]
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]
Reversal of impairment			949,645
Impairment		(2,213,428)		(31,004,065)
Impairment (reversal of impairment)		24,233,795	18,935,146	23,540,000
Pemex Exploration And Production [member] | Antonio J Bermdez [Member]
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]
Reversal of impairment				6,811,344
Impairment		(9,705,730)	(3,562,021)
Impairment (reversal of impairment)		24,027,588	39,195,252
Pemex Exploration And Production [member] | Tamaulipas Constituciones [Member]
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]
Reversal of impairment				140,125
Impairment		(2,819,337)
Impairment (reversal of impairment)		5,416,487
Pemex Exploration And Production [member] | Chuc [Member]
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]
Impairment		(11,321,001)	(25,431,950)	(6,608,047)
Impairment (reversal of impairment)		63,880,611	72,301,156	97,970,000
Pemex Exploration And Production [member] | Ayn Alux [Member]
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]
Impairment		(3,269,173)	(2,220,696)
Impairment (reversal of impairment)		6,213,753	2,705,441
Pemex Exploration And Production [member] | Yaxche [Member]
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]
Reversal of impairment			20,608,627
Impairment				(20,491,627)
Impairment (reversal of impairment)			93,677,507	516,000
Pemex Exploration And Production [member] | Lakach [Member]
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]
Impairment		(1,269,083)	(56,119)	(841,718)
Impairment (reversal of impairment)		(169,119)	(2,426,036)	$ (1,658,000)
Pemex Exploration And Production [member] | Arenque [Member]
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]
Impairment		(803,256)
Impairment (reversal of impairment)		4,908,009
Pemex Exploration And Production [member] | Ixtal Manik [Member]
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]
Impairment		(481,673)	(5,047,793)
Impairment (reversal of impairment)		$ 12,647,284	19,024,166
Pemex Exploration And Production [member] | Poza Rica [Member]
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]
Impairment			(1,027,191)
Impairment (reversal of impairment)			$ 15,029,941
[1]	See Note 4 for the correction of error in the impairment of Pemex- Exploration and Production CGUs for 65,799,060.

Wells, pipelines, properties_11

Wells, pipelines, properties, plant and equipment, net - Summary of Impairment or Reversal of Impairment of Fixed Assets (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)	Dec. 31, 2020MXN ($)	Dec. 31, 2019USD ($)	Dec. 31, 2019MXN ($)	Dec. 31, 2018USD ($)	Dec. 31, 2018MXN ($)
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]
Impairment or reversal of impairment of fixed assets		$ (36,353,700)		$ (31,283,154)		$ 21,418,997
Pemex industrial transformation [member]
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]
Impairment or reversal of impairment of fixed assets	$ 71,761,571	197,332,486	$ 42,243,942	144,971,590	$ 659,610	124,787,942
Pemex industrial transformation [member] | Salamanca Refinery [Member]
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]
Impairment or reversal of impairment of fixed assets		44,777,784
Pemex industrial transformation [member] | Cadereyta Refinery [Member]
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]
Impairment or reversal of impairment of fixed assets		40,793,541
Pemex industrial transformation [member] | Salina Cruz Refinery [member]
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]
Impairment or reversal of impairment of fixed assets		30,422,588				9,428,152
Pemex industrial transformation [member] | Minatitln Refinery [member]
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]
Impairment or reversal of impairment of fixed assets		18,819,247		61,673,158		54,846,565
Pemex industrial transformation [member] | Cangrejera Ethylene Processor Complex [Member]
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]
Impairment or reversal of impairment of fixed assets		11,493,567
Pemex industrial transformation [member] | Tula Refinery [member]
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]
Impairment or reversal of impairment of fixed assets		34,829,922		40,450,717		39,429,897
Pemex industrial transformation [member] | Madero Refinery [member]
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]
Impairment or reversal of impairment of fixed assets		6,799,072		27,840,687		$ 21,083,328
Pemex industrial transformation [member] | Morelos Complex Ethylene [Member]
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]
Impairment or reversal of impairment of fixed assets		$ 9,396,765		13,731,548
Pemex industrial transformation [member] | Pajaritos Complex Ethylene [Member]
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]
Impairment or reversal of impairment of fixed assets				$ 1,275,480

Wells, Pipelines, Properties_12

Wells, Pipelines, Properties, Plant And Equipment, Net - Summary of Recoverable Amount of Assets (Detail) - Pemex logistics [member] - MXN ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]
Recoverable amount of assets	$ 291,946,584	$ 326,390,923	$ 205,158,645
TAD, TDGL, TOMS (Stotage terminals) [member]
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]
Recoverable amount of assets	95,169,597	147,249,859	92,772,003
Pipelines [Member]
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]
Recoverable amount of assets	88,740,662	105,319,693
Primary logistics [member]
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]
Recoverable amount of assets		$ 73,821,371	111,941,265
Land Transport (white pipes) [member]
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]
Recoverable amount of assets	$ 0		$ 445,377

Wells, Pipelines, Properties_13

Wells, Pipelines, Properties, Plant and Equipment, Net - Consolidated and Separate Financial Statement (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)	Dec. 31, 2020MXN ($)	Dec. 31, 2019MXN ($)	Dec. 31, 2018MXN ($)	Dec. 31, 2020MXN ($)	Dec. 31, 2019USD ($)	Dec. 31, 2019MXN ($)	Dec. 31, 2017MXN ($)
Sales:
Net sales	$ 47,805,715	$ 953,661,844	$ 1,401,971,185	$ 1,681,119,150
Cost of sales	41,737,792	832,614,690	1,122,933,424	1,199,511,561
Gross income (loss)	4,245,564	84,693,454	247,754,607	503,026,586
Other income (loss), net		10,574,132	7,728,756	23,052,511
Administrative expenses	7,313,481	145,894,444	130,768,822	134,321,481
Operating income (loss)	(3,161,261)	(63,063,100)	102,828,630	367,400,407
Net loss	(25,518,054)	(509,052,065)	$ (282,112,024)	(180,419,837)
Cash and cash equivalents	2,004,631			81,912,409	$ 39,989,781	$ 3,038,876	$ 60,621,631	$ 97,851,754
Accounts receivable	3,427,913				68,382,413		89,263,870
Total current assets	16,535,400				329,859,739		343,035,041
Wells, pipelines, properties, plant and equipment, net	63,970,561				1,276,129,521		1,277,548,562
Total assets	96,672,361				1,928,487,928		1,984,247,080
Suppliers	14,135,159				281,978,041		208,034,407
Taxes and duties payable	2,566,599				51,200,314		50,692,629
Other current liabilities					381,312,804		307,279,443
Total liabilities	217,217,913				4,333,214,958		3,915,656,382
Equity (deficit), net	$ (120,545,552)			$ (1,459,405,432)	(2,404,727,030)		$ (1,931,409,302)	$ (1,502,377,342)
Exploration and extraction contracts [member] | Profit sharing [member] | EK or balam [member]
Sales:
Net sales		11,838,057
Cost of sales		10,893,808
Gross income (loss)		944,249
Other income (loss), net		(128,602)
Administrative expenses		62,964
Operating income (loss)		752,683
Net loss		752,683
Cash and cash equivalents					9
Accounts receivable					11,838,057
Total current assets					11,838,066
Wells, pipelines, properties, plant and equipment, net					39,477,424
Total assets					51,315,490
Suppliers					4,340,715
Taxes and duties payable					462
Other current liabilities					474,670
Total liabilities					4,815,847
Equity (deficit), net					46,499,643
Exploration and extraction contracts [member] | Profit sharing [member] | Block two [member]
Sales:
Cost of sales		50,159
Gross income (loss)		(50,159)
Operating income (loss)		(50,159)
Net loss		(50,159)
Cash and cash equivalents					22,852
Accounts receivable					161,079
Total current assets					183,931
Total assets					183,931
Taxes and duties payable					999
Other current liabilities					233,091
Total liabilities					234,090
Equity (deficit), net					(50,159)
Exploration and extraction contracts [member] | Profit sharing [member] | Block eight [member]
Sales:
Cost of sales		45,229
Gross income (loss)		(45,229)
Operating income (loss)		(45,229)
Net loss		(45,229)
Cash and cash equivalents					17,089
Accounts receivable					7,848
Total current assets					24,937
Total assets					24,937
Taxes and duties payable					1,067
Other current liabilities					69,099
Total liabilities					70,166
Equity (deficit), net					(45,229)
Exploration and extraction contracts [member] | Profit sharing [member] | Block sixteen [member]
Sales:
Cost of sales		18,443
Gross income (loss)		(18,443)
Operating income (loss)		(18,443)
Net loss		(18,443)
Accounts receivable					17,040
Total current assets					17,040
Total assets					17,040
Suppliers					18,443
Other current liabilities					17,040
Total liabilities					35,483
Equity (deficit), net					(18,443)
Exploration and extraction contracts [member] | Profit sharing [member] | Block seventeen [member]
Sales:
Cost of sales		19,522
Gross income (loss)		(19,522)
Operating income (loss)		(19,522)
Net loss		(19,522)
Accounts receivable					(907)
Total current assets					(907)
Total assets					(907)
Suppliers					19,522
Other current liabilities					(907)
Total liabilities					18,615
Equity (deficit), net					(19,522)
Exploration and extraction contracts [member] | Profit sharing [member] | Block eighteen [member]
Sales:
Cost of sales		65,343
Gross income (loss)		(65,343)
Operating income (loss)		(65,343)
Net loss		(65,343)
Cash and cash equivalents					5,431
Total current assets					5,431
Total assets					5,431
Taxes and duties payable					1,481
Other current liabilities					69,293
Total liabilities					70,774
Equity (deficit), net					(65,343)
Exploration and extraction contracts [member] | Profit sharing [member] | Block twenty nine [member]
Sales:
Cost of sales		17,783
Gross income (loss)		(17,783)
Operating income (loss)		(17,783)
Net loss		(17,783)
Cash and cash equivalents					16
Total current assets					16
Total assets					16
Suppliers					670
Taxes and duties payable					857
Other current liabilities					16,272
Total liabilities					17,799
Equity (deficit), net					(17,783)
Exploration and extraction contracts [member] | Profit sharing [member] | Block thirty two [member]
Sales:
Cost of sales		51,238
Gross income (loss)		(51,238)
Operating income (loss)		(51,238)
Net loss		(51,238)
Cash and cash equivalents					13,868
Total current assets					13,868
Total assets					13,868
Taxes and duties payable					1,871
Other current liabilities					63,235
Total liabilities					65,106
Equity (deficit), net					(51,238)
Exploration and extraction contracts [member] | Profit sharing [member] | Block thirty three [member]
Sales:
Cost of sales		107,548
Gross income (loss)		(107,548)
Operating income (loss)		(107,548)
Net loss		(107,548)
Accounts receivable					(31,348)
Total current assets					(31,348)
Total assets					(31,348)
Suppliers					107,548
Other current liabilities					(31,348)
Total liabilities					76,200
Equity (deficit), net					(107,548)
Exploration and extraction contracts [member] | Profit sharing [member] | Block thirty five [member]
Sales:
Cost of sales		274,445
Gross income (loss)		(274,445)
Operating income (loss)		(274,445)
Net loss		(274,445)
Accounts receivable					(21,559)
Total current assets					(21,559)
Total assets					(21,559)
Suppliers					274,445
Other current liabilities					(21,559)
Total liabilities					252,886
Equity (deficit), net					(274,445)
Exploration and extraction contracts [member] | Profit sharing [member] | Santuario y El Golpe [member]
Sales:
Net sales		1,559,644
Cost of sales		673,887
Gross income (loss)		885,757
Operating income (loss)		885,757
Net loss		885,757
Cash and cash equivalents					15,213
Accounts receivable					1,640,681
Total current assets					1,655,894
Wells, pipelines, properties, plant and equipment, net					1,344,617
Total assets					3,000,511
Suppliers					930,246
Other current liabilities					96,251
Total liabilities					1,026,497
Equity (deficit), net					1,974,014
Exploration and extraction contracts [member] | Profit sharing [member] | Area Mision [member]
Sales:
Net sales		942,514
Cost of sales		1,273,269
Gross income (loss)		(330,755)
Operating income (loss)		(330,755)
Net loss		(330,755)
Cash and cash equivalents					5
Accounts receivable					1,290,282
Total current assets					1,290,287
Wells, pipelines, properties, plant and equipment, net					802,194
Total assets					2,092,481
Suppliers					615,457
Other current liabilities					347,774
Total liabilities					963,231
Equity (deficit), net					1,129,250
Exploration and extraction contracts [member] | Profit sharing [member] | Ebano [member]
Sales:
Net sales		374,118
Cost of sales		637,905
Gross income (loss)		(263,787)
Operating income (loss)		(263,787)
Net loss		(263,787)
Accounts receivable					374,118
Total current assets					374,118
Wells, pipelines, properties, plant and equipment, net					1,317,055
Total assets					1,691,173
Suppliers					602,659
Total liabilities					602,659
Equity (deficit), net					1,088,514
Exploration and extraction contracts [member] | License [member] | Block Three [member]
Sales:
Cost of sales		32,908
Gross income (loss)		(32,908)
Operating income (loss)		(32,908)
Net loss		(32,908)
Accounts receivable					(32,908)
Total current assets					(32,908)
Total assets					(32,908)
Equity (deficit), net					(32,908)
Exploration and extraction contracts [member] | License [member] | Block two [member]
Sales:
Cost of sales		89,762
Gross income (loss)		(89,762)
Operating income (loss)		(89,762)
Net loss		(89,762)
Accounts receivable					(36,216)
Total current assets					(36,216)
Total assets					(36,216)
Suppliers					85,698
Other current liabilities					(32,152)
Total liabilities					53,546
Equity (deficit), net					(89,762)
Exploration and extraction contracts [member] | License [member] | Block eighteen [member]
Sales:
Cost of sales		106,755
Gross income (loss)		(106,755)
Operating income (loss)		(106,755)
Net loss		(106,755)
Cash and cash equivalents					20
Total current assets					20
Total assets					20
Taxes and duties payable					5,312
Other current liabilities					101,463
Total liabilities					106,775
Equity (deficit), net					(106,755)
Exploration and extraction contracts [member] | License [member] | Block Five [member]
Sales:
Cost of sales		100,050
Gross income (loss)		(100,050)
Operating income (loss)		(100,050)
Net loss		(100,050)
Cash and cash equivalents					20
Total current assets					20
Total assets					20
Suppliers					670
Taxes and duties payable					4,976
Other current liabilities					94,424
Total liabilities					100,070
Equity (deficit), net					(100,050)
Exploration and extraction contracts [member] | License [member] | Block twenty two [member]
Sales:
Cost of sales		92,633
Gross income (loss)		(92,633)
Operating income (loss)		(92,633)
Net loss		(92,633)
Accounts receivable					(48,872)
Total current assets					(48,872)
Total assets					(48,872)
Suppliers					92,633
Other current liabilities					(48,872)
Total liabilities					43,761
Equity (deficit), net					(92,633)
Exploration and extraction contracts [member] | License [member] | Cardenas Mora [member]
Sales:
Net sales		1,005,967
Cost of sales		606,463
Gross income (loss)		399,504
Operating income (loss)		399,504
Net loss		399,504
Cash and cash equivalents					146
Accounts receivable					1,892,736
Total current assets					1,892,882
Wells, pipelines, properties, plant and equipment, net					1,774,845
Total assets					3,667,727
Suppliers					690,174
Other current liabilities					886,914
Total liabilities					1,577,088
Equity (deficit), net					2,090,639
Exploration and extraction contracts [member] | License [member] | Ogarrio field [member]
Sales:
Net sales		1,184,356
Cost of sales		674,421
Gross income (loss)		509,935
Operating income (loss)		509,935
Net loss		509,935
Cash and cash equivalents					512
Accounts receivable					1,648,777
Total current assets					1,649,289
Wells, pipelines, properties, plant and equipment, net					1,345,902
Total assets					2,995,191
Suppliers					980,727
Other current liabilities					464,933
Total liabilities					1,445,660
Equity (deficit), net					1,549,531
Exploration and extraction contracts [member] | License [member] | Miquetla [member]
Sales:
Net sales		167,504
Cost of sales		189,557
Gross income (loss)		(22,053)
Operating income (loss)		(22,053)
Net loss		(22,053)
Accounts receivable					167,505
Total current assets					167,505
Wells, pipelines, properties, plant and equipment, net					97,546
Total assets					265,051
Suppliers					181,605
Total liabilities					181,605
Equity (deficit), net					83,446
Exploration and extraction contracts [member] | License [member] | Trion [member]
Sales:
Cost of sales		9,360
Gross income (loss)		(9,360)
Operating income (loss)		(9,360)
Net loss		$ (9,360)
Suppliers					9,360
Total liabilities					9,360
Equity (deficit), net					$ (9,360)

Intangible Assets, Net - Additi

Intangible Assets, Net - Additional Information (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020MXN ($)	Dec. 31, 2019MXN ($)	Dec. 31, 2020USD ($)	Dec. 31, 2020MXN ($)
Disclosure of detailed information about intangible assets [abstract]
Intangible assets		$ 14,584,524	$ 1,141,718	$ 22,775,784
Expenses related to unsuccessful wells	$ 19,351,986	$ 79,595,185

Intangible Assets, Net - Schedu

Intangible Assets, Net - Schedule of Intangible Assets, Net are Wells Unassigned to a Reserve (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)	Dec. 31, 2020MXN ($)	Dec. 31, 2019MXN ($)	Dec. 31, 2018MXN ($)
Wells unassigned to a reserve:
Balance at the beginning of period		$ 14,584,524
Transfers against fixed assets		6,229,356	$ 5,986,055	$ 6,726,769
Balance at the end of period	$ 1,141,718	22,775,784	14,584,524
Wells unassigned to reserve [member]
Wells unassigned to a reserve:
Balance at the beginning of period		12,831,281	9,779,239
Additions to construction in progress		23,237,519	17,028,974
Transfers against expenses		(8,404,284)	(7,990,877)
Transfers against fixed assets		(6,229,356)	(5,986,055)
Balance at the end of period		$ 21,435,160	$ 12,831,281	$ 9,779,239

Intangible Assets, Net - Sche_2

Intangible Assets, Net - Schedule of Other Components of Intangible Assets (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)	Dec. 31, 2020MXN ($)	Dec. 31, 2019MXN ($)	Dec. 31, 2018MXN ($)
Disclosure of detailed information about intangible assets [line items]
Balance at the beginning of period		$ 14,584,524
Amortization	$ 24,011	478,988	$ 543,372	$ 2,643,326
Balance at the end of period	$ 1,141,718	22,775,784	14,584,524
Other intangible assets [member]
Disclosure of detailed information about intangible assets [line items]
Balance at the beginning of period		1,753,243
Balance at the end of period		1,340,624	1,753,243
Other intangible assets [member] | Carrying amount [member]
Disclosure of detailed information about intangible assets [line items]
Balance at the beginning of period		6,767,163	6,646,620
Additions		403,586	230,703
Disposals		(667,152)
Effects of foreign exchange		150,808	(110,160)
Balance at the end of period		6,654,405	6,767,163	6,646,620
Other intangible assets [member] | Accumulated depreciation and amortization [member]
Disclosure of detailed information about intangible assets [line items]
Balance at the beginning of period		(5,013,920)	(4,615,307)
Disposals		271,034
Amortization		(478,988)	(457,031)
Effects of foreign exchange		(91,907)	58,418
Balance at the end of period		(5,313,781)	(5,013,920)	(4,615,307)
Licencse [member] | Other intangible assets [member]
Disclosure of detailed information about intangible assets [line items]
Balance at the beginning of period		347,183
Balance at the end of period		$ 293,191	$ 347,183
Useful lives	1 to 3 years	1 to 3 years	1 to 3 years
Licencse [member] | Other intangible assets [member] | Carrying amount [member]
Disclosure of detailed information about intangible assets [line items]
Balance at the beginning of period		$ 4,579,486	$ 4,391,069
Additions		375,801	201,853
Disposals		(139,663)
Effects of foreign exchange		56,067	(13,436)
Balance at the end of period		4,885,305	4,579,486	4,391,069
Licencse [member] | Other intangible assets [member] | Accumulated depreciation and amortization [member]
Disclosure of detailed information about intangible assets [line items]
Balance at the beginning of period		(4,232,303)	(3,871,442)
Disposals		138,099
Amortization		(441,229)	(386,414)
Effects of foreign exchange		(56,681)	25,553
Balance at the end of period		(4,592,114)	(4,232,303)	(3,871,442)
Exploration expenses, evaluation of assets and concessoins [member] | Other intangible assets [member]
Disclosure of detailed information about intangible assets [line items]
Balance at the beginning of period		1,406,060
Balance at the end of period		$ 1,047,433	$ 1,406,060
Useful lives	Up to 36 years	Up to 36 years	Up to 36 years
Exploration expenses, evaluation of assets and concessoins [member] | Other intangible assets [member] | Carrying amount [member]
Disclosure of detailed information about intangible assets [line items]
Balance at the beginning of period		$ 2,187,677	$ 2,255,551
Additions		27,785	28,850
Disposals		(527,489)
Effects of foreign exchange		94,741	(96,724)
Balance at the end of period		1,769,100	2,187,677	2,255,551
Exploration expenses, evaluation of assets and concessoins [member] | Other intangible assets [member] | Accumulated depreciation and amortization [member]
Disclosure of detailed information about intangible assets [line items]
Balance at the beginning of period		(781,617)	(743,865)
Disposals		132,935
Amortization		(37,759)	(70,617)
Effects of foreign exchange		(35,226)	32,865
Balance at the end of period		$ (721,667)	$ (781,617)	$ (743,865)

Long-Term Notes Receivable, G_3

Long-Term Notes Receivable, Government Bonds And Other Assets - Summary of Long-term Notes Receivable (Detail) $ in Thousands, $ in Thousands	Dec. 31, 2020USD ($)	Dec. 31, 2020MXN ($)	Dec. 31, 2019MXN ($)
Disclosure Of Notes Receivable Government Bonds And Other Long Term Assets [Abstract]
Promissory notes issued by the Mexican Government		$ 0	$ 121,624,852
Other long-term notes receivable		886,827	940,454
Total long-term notes receivable	$ 44,455	$ 886,827	$ 122,565,306

Long-Term Notes Receivable, G_4

Long-Term Notes Receivable, Government Bonds And Other Assets - Summary of Promissory Notes Issued (Detail) - MXN ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Disclosure Of Notes Receivable And Other Long Term Assets [abstract]
Total promissory notes issued by the Mexican Government	$ 0	$ 126,534,822
Less: current portion of notes receivable issued by the Mexican Government, net of expected credit losses		4,909,970
Long-term promissory notes	$ 0	$ 121,624,852

Long-Term Notes Receivable, G_5

Long-Term Notes Receivable, Government Bonds And Other Assets - Additional Information (Detail) $ in Thousands, $ in Thousands

Nov. 20, 2020MXN ($)

Nov. 19, 2020USD ($)

Mar. 31, 2020MXN ($)

Aug. 15, 2016MXN ($)

Jun. 29, 2016MXN ($)

Dec. 24, 2015MXN ($)

Aug. 15, 2016MXN ($)

Nov. 19, 2020MXN ($)

Dec. 31, 2021MXN ($)

Dec. 31, 2020MXN ($)

Dec. 31, 2019MXN ($)

Dec. 31, 2018MXN ($)

Dec. 31, 2020USD ($)

Dec. 31, 2020MXN ($)

Dec. 31, 2020MXV ( )

Disclosure of notes receivable government bonds and other long term assets [line items]

Long-term notes receivable

$ 126,534,822

$ 0

Payment of promissory notes

$ 1,151,962,147

1,185,042,283

$ 841,033,392

Principal amount of debt

1,947,986,835

2,215,049,262

Borrowings

1,738,249,903

$ 93,621,642

1,867,630,050

Government Bonds [Member]

Disclosure of notes receivable government bonds and other long term assets [line items]

Principal amount of debt

$ 128,786,611

Borrowings

95,597,610

95,597,610

Fair value of the transferred assets

129,320,536

Fair value of associated financial liabilities

95,630,214

Fair value of transferred financial assets and associated financial liabilities, Net

33,690,322

Government Bonds [Member] | Eighteen Series of Development Bonds [Member]

Disclosure of notes receivable government bonds and other long term assets [line items]

Maturity

2021 and 2026

Notional amount

$ 118,280,727

913,482

Government Bonds [Member] | Three Year Financing Arrangement [Member]

Disclosure of notes receivable government bonds and other long term assets [line items]

Maturity

November 24, 2023

Notional amount

$ 95,597,610

Interest rate

8.56275%

Mexican Government [Member]

Disclosure of notes receivable government bonds and other long term assets [line items]

Payment of promissory notes

38,705,497

Repayments of principal

32,493,666

Repayments of interest

6,211,831

Interest income

$ 817,270

Financing income [member]

Disclosure of notes receivable government bonds and other long term assets [line items]

Accrued yields

$ 7,097,040

Promissory note additional interest amount

$ 614

Financing income [member] | Government Bonds [Member]

Disclosure of notes receivable government bonds and other long term assets [line items]

Interest income

$ 2,103,099

Bottom of range [member]

Disclosure of notes receivable government bonds and other long term assets [line items]

Interest per annum of promissory notes

5.39%

Top of range [member]

Disclosure of notes receivable government bonds and other long term assets [line items]

Interest per annum of promissory notes

7.00%

SHCP [member]

Disclosure of notes receivable government bonds and other long term assets [line items]

Accrued interest rate

6.93%

Petroleos Mexicanos [member]

Disclosure of notes receivable government bonds and other long term assets [line items]

Notes issued in advance payment

$ 50,000,000

Discounted value of promissory note

$ 184,230,586

Promissory notes exchange price

$ 47,000,000

Increase in equity

$ 135,439,612

Increase in convertible promissory notes

$ 1,209,026

Promissory note principle amount

$ 4,102,622

Promissory note interest amount

881,048

Payment of promissory notes

$ 4,983,670

Non-negotiable promissory note [member] | SHCP [member]

Disclosure of notes receivable government bonds and other long term assets [line items]

Notes issued in advance payment

$ 50,000,000

New Mexican Government Local Bonds [Member] | Petroleos Mexicanos And SHCP [Member]

Disclosure of notes receivable government bonds and other long term assets [line items]

Promissory notes exchange price

$ 128,656,192

Number Of Promissory Notes Exchanged

16

Long-Term Notes Receivable, G_6

Long-Term Notes Receivable, Government Bonds And Other Assets - Summary of Promissory Notes Maturity Dates and Annual Rates (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2019MXN ($)Promissory_Notes	Dec. 31, 2020MXN ($)
Disclosure of notes receivable and other non current assets [line items]
Total promissory notes	$ 126,534,822	$ 0
Less: current portion	4,909,970
Long-term notes receivable	$ 121,624,852
5.39% notes due 2020 [member]
Disclosure of notes receivable and other non current assets [line items]
Number of promissory notes | Promissory_Notes	1
Maturity	2020
Yield Rate Range	5.39%
Long-term notes receivable	$ 4,909,970
5.57% notes due 2021 [member]
Disclosure of notes receivable and other non current assets [line items]
Number of promissory notes | Promissory_Notes	1
Maturity	2021
Yield Rate Range	5.57%
Long-term notes receivable	$ 5,846,979
5.74% notes due 2022 [member]
Disclosure of notes receivable and other non current assets [line items]
Number of promissory notes | Promissory_Notes	1
Maturity	2022
Yield Rate Range	5.74%
Long-term notes receivable	$ 6,500,329
5.88% notes due 2023 [member]
Disclosure of notes receivable and other non current assets [line items]
Number of promissory notes | Promissory_Notes	1
Maturity	2023
Yield Rate Range	5.88%
Long-term notes receivable	$ 7,112,804
5.99% notes due 2024 [member]
Disclosure of notes receivable and other non current assets [line items]
Number of promissory notes | Promissory_Notes	1
Maturity	2024
Yield Rate Range	5.99%
Long-term notes receivable	$ 7,534,758
6.06% to 6.62% notes due 2025 to 2029 [member]
Disclosure of notes receivable and other non current assets [line items]
Number of promissory notes | Promissory_Notes	5
Maturity	2025 to 2029
Long-term notes receivable	$ 40,018,603
6.06% to 6.62% notes due 2025 to 2029 [member] | Bottom of range [member]
Disclosure of notes receivable and other non current assets [line items]
Yield Rate Range	6.06%
6.06% to 6.62% notes due 2025 to 2029 [member] | Top of range [member]
Disclosure of notes receivable and other non current assets [line items]
Yield Rate Range	6.62%
6.70% to 6.90% notes due 2030 to 2034 [member]
Disclosure of notes receivable and other non current assets [line items]
Number of promissory notes | Promissory_Notes	5
Maturity	2030 to 2034
Long-term notes receivable	$ 39,692,547
6.70% to 6.90% notes due 2030 to 2034 [member] | Bottom of range [member]
Disclosure of notes receivable and other non current assets [line items]
Yield Rate Range	6.70%
6.70% to 6.90% notes due 2030 to 2034 [member] | Top of range [member]
Disclosure of notes receivable and other non current assets [line items]
Yield Rate Range	6.90%
6.95% to 7.00% notes due 2035 to 2036 [member]
Disclosure of notes receivable and other non current assets [line items]
Number of promissory notes | Promissory_Notes	2
Maturity	2035 to 2036
Long-term notes receivable	$ 14,918,832
6.95% to 7.00% notes due 2035 to 2036 [member] | Bottom of range [member]
Disclosure of notes receivable and other non current assets [line items]
Yield Rate Range	6.95%
6.95% to 7.00% notes due 2035 to 2036 [member] | Top of range [member]
Disclosure of notes receivable and other non current assets [line items]
Yield Rate Range	7.00%

Long-Term Notes Receivable, G_7

Long-Term Notes Receivable, Government Bonds And Other Assets - Summary of Promissory Notes Maturity Dates and Annual Rates (Parenthetical) (Detail) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of notes receivable and other non current assets [line items]
Impairment loss	$ 103,736,696	$ 139,056,243	$ 121,295,334
5.39% notes due 2020 [member]
Disclosure of notes receivable and other non current assets [line items]
Impairment loss		8,000
Promissory note before impairment		$ 4,917,970

Long-Term Notes Receivable, G_8

Long-Term Notes Receivable, Government Bonds And Other Assets - Summary of Roll forward Related to the Promissory Notes (Detail) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disclosure of Roll Forward Related to the Promissory Notes [Line Items]
Balance at the beginning of the year	$ 121,624,852
Balance at the end of the year	0	$ 121,624,852
Promissory Notes [Member]
Disclosure of Roll Forward Related to the Promissory Notes [Line Items]
Balance at the beginning of the year	126,534,822	156,981,745
Long-term receivable from the Mexican Government	(4,102,622)	(32,493,666)
Accrued interests	7,097,040	8,266,574
Interests received from promissory notes	(881,048)	(6,211,831)
Reversal of (impairment) of the promissory notes	8,000	(8,000)
Exchange from promissory notes to Bonds	(128,656,192)	0
Balance at the end of the year	$ 0	$ 126,534,822

Long-Term Notes Receivable, G_9

Long-Term Notes Receivable, Government Bonds And Other Assets - Summary of Balance of Government Bonds (Detail) $ in Thousands	Dec. 31, 2020MXN ($)
Disclosure Of Notes Receivable Government Bonds And Other Non Current Assets [Line Items]
Government bonds	$ 129,320,536
Government Bonds [Member]
Disclosure Of Notes Receivable Government Bonds And Other Non Current Assets [Line Items]
Government bonds	129,549,519
Less: current portion of Government Bonds, net of expected credit losses	18,036,557
Total long-term notes receivable	$ 111,512,962

Long-Term Notes Receivable, _10

Long-Term Notes Receivable, Government Bonds And Other Assets - Summary of Balance of Government Bonds (Parenthetical) (Detail) $ in Thousands	Dec. 31, 2020MXN ($)
Government Bonds [Member]
Disclosure Of Notes Receivable Government Bonds And Other Non Current Assets [Line Items]
Expected credit losses	$ 17,581

Long-Term Notes Receivable, _11

Long-Term Notes Receivable, Government Bonds And Other Assets - Summary of Roll forward of the Mexican Bonds (Detail) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2018
Disclosure of Roll Forward Related to the Mexican Bonds [Line Items]
Interests received from bonds		$ 187,615
Mexican Bonds [Member] | Mexican Government [Member]
Disclosure of Roll Forward Related to the Mexican Bonds [Line Items]
Promissory notes value at the beginning of the exchange as of November 19, 2020	$ 128,656,192
Financial income from the Exchange of promissory notes to Bonds	130,419
Initial value of Mexican Bonds as of November 19, 2020	128,786,611
Accrued interests	2,103,099
Interests received from bonds	(817,270)
Impact of the valuation of bonds in UDIS	(505,339)
(Impairment) of bonds	(17,582)
Balance at the end of the year	$ 129,549,519

Long-Term Notes Receivable, _12

Long-Term Notes Receivable, Government Bonds And Other Assets - Summary of Other Assets (Detail) $ in Thousands, $ in Thousands	Dec. 31, 2020USD ($)	Dec. 31, 2020MXN ($)	Dec. 31, 2019MXN ($)
Disclosure Of Notes Receivable And Other Long Term Assets [abstract]
Payments in advance		$ 5,223,679	$ 2,650,251
Other		1,680,934	1,518,801
Insurance		678,897	484,955
Total other assets	$ 380,151	$ 7,583,510	$ 4,654,007

Long-Term Notes Receivable, _13

Long-Term Notes Receivable, Government Bonds And Other Assets - Summary of Other Assets (Parenthetical) (Detail) $ in Thousands	Dec. 31, 2020MXN ($)
OPCO Soluciones SA de CV [Member] | Pemex AGRO [Member] | Cash Retention [Member]
Disclosure Of Notes Receivable And Other Long Term Assets [Line Items]
Restricted Cash	$ 50,661

Debt - Additional Information (

Debt - Additional Information (Detail) $ in Thousands

Dec. 07, 2020USD ($)

Nov. 20, 2020MXN ($)

Oct. 16, 2020USD ($)

Aug. 24, 2020USD ($)

May 26, 2020USD ($)

Jan. 28, 2020USD ($)

Dec. 23, 2019MXN ($)

Oct. 11, 2019USD ($)

Sep. 27, 2019USD ($)

Sep. 23, 2019USD ($)

Jul. 29, 2019USD ($)

Jun. 28, 2019USD ($)

Dec. 31, 2020USD ($)

Dec. 31, 2020MXN ($)

Dec. 31, 2019USD ($)

Dec. 31, 2019MXN ($)

Dec. 31, 2018MXN ($)

Dec. 31, 2020MXN ($)

Dec. 15, 2020USD ($)

Nov. 14, 2020MXN ($)

Feb. 06, 2020USD ($)

Jan. 30, 2020USD ($)

Jan. 29, 2020

Jan. 21, 2020USD ($)

Dec. 31, 2019MXN ($)

Nov. 25, 2019USD ($)

Nov. 25, 2019MXN ($)

Dec. 31, 2018USD ($)

Dec. 28, 2018USD ($)

Dec. 28, 2018MXN ($)

Disclosure of debt [line items]

Internal net debt

$ 10,000,000

$ 4,350,000

External net debt

$ 1,250,000,000

$ 5,422,500,000

Borrowings

$ 2,232,694,117

$ 2,035,079,540

$ 1,851,000,000

$ 34,875,000

$ 5,640,000,000

$ 112,000,000

Principal amount of debt

2,215,049,262

1,947,986,835

Line of credit

$ 6,780,000,000

16,000,000

Prior size of the Medium Term Notes Program

$ 102,000,000,000

New size of the Medium Term Notes Program

$ 112,000,000,000

Line of credit to ensure liquidity

7,450,000,000

$ 37,000,000

Repayment of revolving credit lines

$ 1,151,962,147

$ 1,185,042,283

$ 841,033,392

Available credit lines

190,604,990

Factoring of receivables [member]

Disclosure of debt [line items]

Recognised assets representing continuing involvement in derecognised financial assets

$ 4,067,650

Revolving credit line [member]

Disclosure of debt [line items]

Borrowings interest rate description

LIBOR plus 350 basis points

New Credit Line [member]

Disclosure of debt [line items]

Debt securities issued

$ 28,000,000

Series C medium term notes program [member]

Disclosure of debt [line items]

Borrowings

$ 112,000,000,000

$ 334,442,000

$ 96,970,000

$ 63,854,000

Maturity

2022

Revolving Credit Facility Due 2024 [Member]

Disclosure of debt [line items]

Maturity

2024

Revolving credit maximum borrowing capacity

$ 5,500,000,000

Term Loan Facility Due 2024 [Member]

Disclosure of debt [line items]

Revolving credit maximum borrowing capacity

$ 2,500,000,000

CreditLline Due 2028 [Member]

Disclosure of debt [line items]

Maturity

2028

Revolving credit maximum borrowing capacity

$ 206,901,000

CreditLline Due October 2019 [Member]

Disclosure of debt [line items]

Borrowings interest rate description

TIIE plus 1%

Certificados Bursatiles [member]

Disclosure of debt [line items]

Debt securities issued

$ 5,100,368

Notional amount

$ 100,000,000

Renewing of Credit Line Due on May Two Thousand and Twenty [Member]

Disclosure of debt [line items]

Borrowings

$ 400,000,000

Maturity

May 2020

Renewing of Credit Line Due on Two Thousand and Twenty One [Member]

Disclosure of debt [line items]

Borrowings

$ 200,000,000

Revolving Credit Facility Due Two Thousand Twenty Three [Member]

Disclosure of debt [line items]

Borrowings

$ 1,500,000,000

Maturity

2023

Borrowings interest rate description

LIBOR plus 300 to 475 basis points

Lines Of Credit [Member]

Disclosure of debt [line items]

Borrowings

$ 3,600,000,000

71,815,320

Line of credit

7,700,000,000

37,000,000

Available credit lines

1,900,000,000

$ 37,000,000

Floating interest rate at libor [member]

Disclosure of debt [line items]

Borrowings

$ 120

5.500% Bonds due 2044 [member]

Disclosure of debt [line items]

Interest rate

5.50%

Principal amount of debt

$ 179,332,000

5.500% Bonds due 2044 [member] | Series C medium term notes program [member]

Disclosure of debt [line items]

Borrowings

$ 730,486,000

Interest rate

5.50%

5.625% Bonds due 2046 [member]

Disclosure of debt [line items]

Interest rate

5.625%

Principal amount of debt

$ 750,969,000

5.625% Bonds due 2046 [member] | Series C medium term notes program [member]

Disclosure of debt [line items]

Borrowings

$ 277,215,000

Interest rate

5.625%

6.350% Bonds due 2048 [member]

Disclosure of debt [line items]

Interest rate

6.35%

Principal amount of debt

$ 444,125,000

6.000% Notes due 2020 [member] | Series C medium term notes program [member]

Disclosure of debt [line items]

Borrowings

$ 491,803,000

Interest rate

6.00%

Maturity

2020

3.500% Notes due 2020 [member] | Series C medium term notes program [member]

Disclosure of debt [line items]

Borrowings

$ 242,511,000

Interest rate

3.50%

Maturity

2020

6.490% notes due 2027 [member]

Disclosure of debt [line items]

Borrowings

$ 8,198

Interest rate

6.49%

6.490% notes due 2027 [member] | Series C medium term notes program [member]

Disclosure of debt [line items]

Borrowings

$ 1,102,232,000

$ 1,250,000,000

Debt securities issued

$ 102,000,000,000

Interest rate

6.49%

6.49%

Maturity

2027

2027

6.840% notes due 2030 [member]

Disclosure of debt [line items]

Borrowings

$ 7,245

Interest rate

6.84%

6.840% notes due 2030 [member] | Series C medium term notes program [member]

Disclosure of debt [line items]

Borrowings

$ 1,163,586,000

$ 3,250,000,000

Interest rate

6.84%

6.84%

Maturity

2030

2030

7.690% notes due 2050 [member]

Disclosure of debt [line items]

Borrowings

$ 617

Interest rate

7.69%

7.690% notes due 2050 [member] | Series C medium term notes program [member]

Disclosure of debt [line items]

Borrowings

$ 5,065,788,000

$ 3,000,000,000

Interest rate

7.69%

7.69%

Maturity

2050

2050

5.500% Notes due 2021 [member] | Series C medium term notes program [member]

Disclosure of debt [line items]

Borrowings

$ 1,897,615,000

$ 264,752,000

Interest rate

5.50%

5.50%

Maturity

2021

6.375% Notes due 2021 [member] | Series C medium term notes program [member]

Disclosure of debt [line items]

Borrowings

$ 883,977,000

$ 171,662,000

Interest rate

6.375%

6.375%

Maturity

2021

8.625% Bonds due 2022 [member]

Disclosure of debt [line items]

Borrowings

$ 10

Interest rate

8.625%

8.625% Bonds due 2022 [member] | Series C medium term notes program [member]

Disclosure of debt [line items]

Borrowings

$ 53,310,000

$ 17,316,000

Interest rate

8.625%

8.625%

Maturity

2022

5.375% Notes due 2022 [member]

Disclosure of debt [line items]

Borrowings

$ 500

Interest rate

5.375%

5.375% Notes due 2022 [member] | Series C medium term notes program [member]

Disclosure of debt [line items]

Borrowings

$ 654,668,000

$ 235,177,000

$ 157,487,000

Interest rate

5.375%

5.375%

5.375%

Maturity

2022

4.875% Notes due 2022 [member]

Disclosure of debt [line items]

Borrowings

$ 7,698

Interest rate

4.875%

4.875% Notes due 2022 [member] | Series C medium term notes program [member]

Disclosure of debt [line items]

Borrowings

$ 940,618,000

$ 361,601,000

$ 148,535,000

Interest rate

4.875%

4.875%

4.875%

Maturity

2022

3.500% notes due to 2023 [member]

Disclosure of debt [line items]

Borrowings

$ 4,247

Interest rate

3.50%

3.500% notes due to 2023 [member] | Series C medium term notes program [member]

Disclosure of debt [line items]

Borrowings

$ 389,985,000

$ 344,853,000

$ 216,727,000

Interest rate

3.50%

3.50%

3.50%

Maturity

2023

4.625% notes due to 2023 [member]

Disclosure of debt [line items]

Borrowings

$ 3,050

Interest rate

4.625%

4.625% notes due to 2023 [member] | Series C medium term notes program [member]

Disclosure of debt [line items]

Borrowings

$ 612,735,000

$ 433,946,000

$ 117,333,000

Interest rate

4.625%

4.625%

4.625%

Maturity

2023

8.625% Bonds due 2023 [member]

Disclosure of debt [line items]

Borrowings

$ 20

Interest rate

8.625%

8.625% Bonds due 2023 [member] | Series C medium term notes program [member]

Disclosure of debt [line items]

Borrowings

$ 58,982,000

Interest rate

8.625%

4.875% Notes due 2024 [member]

Disclosure of debt [line items]

Borrowings

$ 595

Interest rate

4.875%

4.875% Notes due 2024 [member] | Series C medium term notes program [member]

Disclosure of debt [line items]

Borrowings

$ 466,787,000

Interest rate

4.875%

4.250% Notes due 2025 [member]

Disclosure of debt [line items]

Borrowings

$ 273

Interest rate

4.25%

4.250% Notes due 2025 [member] | Series C medium term notes program [member]

Disclosure of debt [line items]

Borrowings

$ 208,769,000

Interest rate

4.25%

6.500% notes due 2041 [member] | Series C medium term notes program [member]

Disclosure of debt [line items]

Borrowings

$ 1,439,479,000

Interest rate

6.50%

6.375% Notes due 2045 [member] | Series C medium term notes program [member]

Disclosure of debt [line items]

Borrowings

$ 1,439,519,000

Interest rate

6.375%

4.500% Notes Due 2026 | Series C medium term notes program [member]

Disclosure of debt [line items]

Borrowings

$ 111,953,000

Interest rate

4.50%

5.950% Notes due 2031 [member]

Disclosure of debt [line items]

Debt securities issued

$ 2,500,000,000

Interest rate

5.95%

5.95%

5.95%

Principal amount of debt

$ 1,300,000,000

6.950% Bonds due 2060 [member]

Disclosure of debt [line items]

Debt securities issued

$ 2,500,000,000

Interest rate

6.95%

6.95%

6.95%

Principal amount of debt

$ 1,300,000,000

Notes Due 2020 [Member]

Disclosure of debt [line items]

Principal amount of debt purchased

$ 61,992,000

Notes And Bonds Between 2020 And 2026 [Member]

Disclosure of debt [line items]

Principal amount of debt

$ 1,252,303,000

6.875% Notes due October 2025 [member] | Series C medium term notes program [member]

Disclosure of debt [line items]

Borrowings

$ 1,500,000,000

Interest rate

6.875%

Maturity

October 2025

6.875% Notes due October 2025 [member] | Term Loan [Member]

Disclosure of debt [line items]

Borrowings

$ 150,000,000

Maturity

August 2022

Floating Rate LIBOR plus Four Hundred and Twenty Five Basis Points Due on August Two Thousand and Twenty Two Due [Member]

Disclosure of debt [line items]

Borrowings interest rate description

LIBOR plus 425 basis points

8.56275% bond Due On November 2023[member] | New Government Bonds [Member]

Disclosure of debt [line items]

Borrowings

$ 95,597,610

Interest rate

8.56275%

Borrowings interest rate description

November 24, 2023

P.M.I. Holdings, B.V. [member]

Disclosure of debt [line items]

Revolving credit facility amount

28,489,000,000

22,456,000,000

Repayment of revolving credit lines

27,657,935,000

21,600,000,000

Revolving credit amount outstanding

$ 2,387,065,000

$ 1,556,000,000

$ 700,000,000

Series C medium term notes program [member]

Disclosure of debt [line items]

Debt securities issued net

$ 5,000,000,000

Medium Term Program Size

$ 112,000,000,000

Series C medium term notes program [member] | Floating interest rate at libor [member]

Disclosure of debt [line items]

Maturity

2022

2022

Series C medium term notes program [member] | 5.500% Bonds due 2044 [member]

Disclosure of debt [line items]

Maturity

2044

Series C medium term notes program [member] | 5.625% Bonds due 2046 [member]

Disclosure of debt [line items]

Maturity

2046

Series C medium term notes program [member] | 6.490% notes due 2027 [member]

Disclosure of debt [line items]

Maturity

2027

Series C medium term notes program [member] | 6.840% notes due 2030 [member]

Disclosure of debt [line items]

Maturity

2030

Series C medium term notes program [member] | 7.690% notes due 2050 [member]

Disclosure of debt [line items]

Maturity

2050

Series C medium term notes program [member] | 8.625% Bonds due 2022 [member]

Disclosure of debt [line items]

Maturity

2022

2022

Series C medium term notes program [member] | 5.375% Notes due 2022 [member]

Disclosure of debt [line items]

Maturity

2022

2022

Series C medium term notes program [member] | 4.875% Notes due 2022 [member]

Disclosure of debt [line items]

Maturity

2022

2022

Series C medium term notes program [member] | 3.500% notes due to 2023 [member]

Disclosure of debt [line items]

Maturity

2023

2023

Series C medium term notes program [member] | 4.625% notes due to 2023 [member]

Disclosure of debt [line items]

Maturity

2023

2023

Series C medium term notes program [member] | 8.625% Bonds due 2023 [member]

Disclosure of debt [line items]

Maturity

2023

2023

Series C medium term notes program [member] | 4.875% Notes due 2024 [member]

Disclosure of debt [line items]

Maturity

2024

2024

Series C medium term notes program [member] | 4.250% Notes due 2025 [member]

Disclosure of debt [line items]

Maturity

2025

2025

Series C medium term notes program [member] | 6.500% notes due 2041 [member]

Disclosure of debt [line items]

Maturity

2041

Series C medium term notes program [member] | 6.375% Notes due 2045 [member]

Disclosure of debt [line items]

Maturity

2045

Debt - Summary of Long-term Deb

Debt - Summary of Long-term Debt (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)	Dec. 31, 2020MXN ($)	Dec. 31, 2019MXN ($)
Disclosure of detailed information about borrowings [line items]
Total principal in pesos			$ 2,215,049,262	$ 1,947,986,835
Accrued interest			42,656,852	33,146,807
Notes payable to contractors			1,021,203	2,040,446
Total			2,258,727,317	1,983,174,088
Less: short-term maturities			347,755,237	210,530,524
Current portion of notes payable to contractors			685,178	1,246,854
Accrued interest			42,656,852	33,146,807
Total short-term debt and current portion of long-term debt			391,097,267	244,924,185
Borrowings	$ 93,621,642		1,867,630,050	1,738,249,903
U.S [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	$ 77,765,173	$ 69,625,755	1,551,314,113	1,312,111,295
U.S [member] | Bonds [member]
Disclosure of detailed information about borrowings [line items]
Rate of interest	Fixed from 1.7% to 9.5% and LIBOR plus 0.35% to 3.65%	Fixed from 1.7% to 9.5% and LIBOR plus 0.35% to 3.65%
Maturity	Various to 2060	Various to 2050
Borrowings	$ 64,686,416	$ 59,352,968	1,290,409,906	1,118,518,559
U.S [member] | Project Finance [member]
Disclosure of detailed information about borrowings [line items]
Rate of interest	Fixed from 2.45% and LIBOR plus 0.24% to 1.75%	Fixed from 2.45% and LIBOR plus 0.24% to 1.75%
Maturity	Various to 2028	Various to 2028
Borrowings	$ 1,721,671	$ 2,183,799	34,345,097	41,154,129
U.S [member] | Direct loans [member]
Disclosure of detailed information about borrowings [line items]
Rate of interest	Fixed to 5.25% and LIBOR plus 1.75% to 4.25%	Fixed from 2.50% to 5.25% and LIBOR plus 1.65% to 3.50%
Maturity	Various to 2031	Various to 2031
Borrowings	$ 1,417,390	$ 3,327,050	28,275,087	62,698,930
U.S [member] | Syndicated loan [member]
Disclosure of detailed information about borrowings [line items]
Rate of interest	LIBOR plus 2.35%	LIBOR plus 2.35%
Maturity	Various to 2024	Various to 2024
Borrowings	$ 2,499,996	$ 2,499,716	49,871,676	47,107,647
U.S [member] | Bank loans [member]
Disclosure of detailed information about borrowings [line items]
Rate of interest	LIBOR plus 3.50% to 5.28%	LIBOR plus 1.19% to 3.50%
Maturity	Various to 2023	Various to 2023
Borrowings	$ 58,678	$ 98,827	1,170,542	1,862,411
U.S [member] | Lease-back [member]
Disclosure of detailed information about borrowings [line items]
Rate of interest	Fixed from 5.4% and 8.4%
U.S [member] | Revolving credit lines [member]
Disclosure of detailed information about borrowings [line items]
Rate of interest	LIBOR plus 2.00% to 3.75% and Fed effective plus 1.30%	LIBOR plus 1.85%
Maturity	2021	2020
Borrowings	$ 5,970,842	$ 670,000	119,110,538	12,626,284
U.S [member] | Financing of Infrastructure asset [member]
Disclosure of detailed information about borrowings [line items]
Rate of interest		Fixed from 5.4% and 8.4%
Maturity	Various to 2036	Various to 2036
Borrowings	$ 1,410,180	$ 1,493,395	28,131,267	28,143,335
Euro
Disclosure of detailed information about borrowings [line items]
Borrowings	$ 13,114,815	$ 14,444,111	320,069,694	305,546,401
Euro | Bonds [member]
Disclosure of detailed information about borrowings [line items]
Rate of interest	Fixed from 1.875% to 5.5% and EURIBOR plus 2.4%	Fixed from 1.875% to 5.5% and EURIBOR plus 2.4%
Maturity	Various to 2030	Various to 2030
Borrowings	$ 12,614,815	$ 13,897,557	307,867,094	293,984,741
Euro | Direct loans [member]
Disclosure of detailed information about borrowings [line items]
Rate of interest	Fixed to 5.11%	Fixed to 5.11% and EURIBOR plus 2.5%
Maturity	Various to 2023	Various to 2023
Borrowings	$ 500,000	$ 546,554	12,202,600	11,561,660
Japan, yen [member] | Bonds [member]
Disclosure of detailed information about borrowings [line items]
Rate of interest	Fixed from 0.54% to 3.5%	Fixed from 0.54% to 3.5% and LIBOR yen plus 0.75%
Maturity	Various to 2026	Various to 2026
Borrowings	$ 109,900,621	$ 173,865,582	21,243,790	30,148,292
Peso
Disclosure of detailed information about borrowings [line items]
Borrowings			251,720,082	217,238,336
Peso | Direct loans [member]
Disclosure of detailed information about borrowings [line items]
Rate of interest	Fixed at 6.55% and TIIE plus 0.85% to 4.1%	Fixed at 6.55% and 7.01% and TIIE plus 0.85% to 4.01%
Maturity	Various to 2029	Various to 2029
Borrowings			19,061,275	38,558,166
Peso | Plus Factoring [member]
Disclosure of detailed information about borrowings [line items]
Rate of interest	TIIE plus 1.25% to 2.0%
Maturity	In 2021
Borrowings			4,067,650
Peso | Syndicated loan [member]
Disclosure of detailed information about borrowings [line items]
Rate of interest	TIIE plus 0.95%	TIIE plus 0.95%
Maturity	Various to 2025	Various to 2025
Borrowings			19,740,035	24,270,589
Peso | Monetization of Mexican Government Bonds [member]
Disclosure of detailed information about borrowings [line items]
Rate of interest	Fixed at 8.56275%
Maturity	Various to 2023
Borrowings			95,597,610
Peso | Certificados Bursatiles [member]
Disclosure of detailed information about borrowings [line items]
Rate of interest	TIIE plus 1.00%, and fixed at 7.19% to 7.65%	Mexican Government Treasury Certificates (“Cetes”) , TIIE(1) plus 0.15% to 1.00%, and fixed at 7.19% to 9.1%
Maturity	Various to 2026	Various to 2026
Borrowings			113,253,512	133,409,581
Peso | Revolving credit lines [member]
Disclosure of detailed information about borrowings [line items]
Rate of interest		TIIE plus 1.50% and 1.95%
Maturity		Various to 2020
Borrowings				21,000,000
Other Currencies [member] | Bonds [member]
Disclosure of detailed information about borrowings [line items]
Rate of interest	Fixed from 1.75% to 8.25%	Fixed from 1.5% to 8.25%
Maturity	Various to 2025	Various to 2025
Borrowings			33,355,569	41,553,990
Unidades de Inversion Certificados bursatiles [Member] | Certificados Bursatiles [member]
Disclosure of detailed information about borrowings [line items]
Rate of interest	Zero rate and Fixed at 3.02% to 5.23%	Zero rate and Fixed at 3.02% to 5.23%
Maturity	Various to 2035	Various to 2035
Borrowings			$ 37,346,014	$ 41,388,521

Debt - Summary of Changes in Co

Debt - Summary of Changes in Consolidated Debt (Detail) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disclosure Of Changes In Consolidated Debt [line items]
Accrued interest	$ 42,656,852	$ 33,146,807
Financed public works contracts [member]
Disclosure Of Changes In Consolidated Debt [line items]
Changes in total debt: At the beginning of the year	1,983,174,088	2,082,286,116
Transfers to lease liabilities	0	(6,053,280)
Loans obtained-financing institutions	1,292,197,518	1,167,834,946
Debt payments	(1,151,962,147)	(1,185,042,283)
Accrued interest	144,207,950	128,061,187
Interest paid	(130,989,150)	(127,945,203)
Foreign exchange	122,099,058	(75,967,395)
At the end of the year	$ 2,258,727,317	$ 1,983,174,088

Debt - Summary of Maturities of

Debt - Summary of Maturities of Long Term Debt Principal Outstanding and Accrued Interest (Detail) - MXN ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Disclosure of detailed information about borrowings [abstract]
2021	$ 391,097,267
2022	117,932,866
2023	131,155,018
2024	181,061,085
2025	114,228,026
2026 and thereafter	1,323,253,055
Total	$ 2,258,727,317	$ 1,983,174,088

Debt - Summary of Maturities _2

Debt - Summary of Maturities of Long Term Debt Principal Outstanding and Accrued Interest (Parenthetical) (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020MXN ($)	Dec. 31, 2019USD ($)	Dec. 31, 2019MXN ($)
Disclosure of detailed information about borrowings [abstract]
Income (expenses) on debt	$ 1,555,266	$ (1,476,826)
Expense related to issuance of debt	1,868,501
Discount related to issuance of debt			$ 958,142
Interest expense on debt instruments issued	$ 313,275
Fees related to the issuance of cost			$ 518,684

Debt - Summary of Long-term D_2

Debt - Summary of Long-term Debt (Parenthetical) (Detail) - MXN ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2020	Dec. 31, 2019
Disclosure of detailed information about borrowings [line items]
Loan from foreign banks					$ 1,992,963,415	$ 1,648,779,936
LIBOR [member]
Disclosure of detailed information about borrowings [line items]
Interest rates	0.23838%	1.90838%		1.91213%	0.25763%
TIIE Rate [member]
Disclosure of detailed information about borrowings [line items]
Interest rates			4.466%	7.4465%	4.4842%	7.5555%

Debt - Summary of Notes Payable

Debt - Summary of Notes Payable to Contractors (Detail) - MXN ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Disclosure Of Changes In Consolidated Debt [abstract]
Total notes payable to contractors	$ 1,021,203	$ 2,040,446
Less: current portion of notes payable to contractors	685,178	1,246,854
Notes payable to contractors (long-term)	$ 336,025	$ 793,592

Debt - Summary of Notes Payab_2

Debt - Summary of Notes Payable to Contractors (Parenthetical) (Detail) $ in Thousands, $ in Thousands	Dec. 31, 2020USD ($)	Dec. 31, 2020MXN ($)	Dec. 31, 2019USD ($)	Dec. 31, 2019MXN ($)
Disclosure Of Changes In Consolidated Debt [line items]
Notes payable outstanding		$ 81,364		$ 755,860
Floating Production Storage And Offloading [member]
Disclosure Of Changes In Consolidated Debt [line items]
Investment	$ 723,575
Outstanding balances owed to contractor	$ 47,112	$ 939,839	$ 68,165	$ 1,284,587

Debt - Summary of Estimated Fut

Debt - Summary of Estimated Future Contract Payments (Detail) - Floating Production Storage And Offloading [member] $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)
Disclosure Of Estimated Future Contract Payments [line items]
2021	$ 33,005
2022	17,265
Less accrued interest	3,158
Total	$ 47,112

Debt - Summary of Foreign Curre

Debt - Summary of Foreign Currency Translation (Detail) - MXN ($)	Dec. 31, 2020	Dec. 31, 2019
U.S. dollars [member]
Disclosure Of Foreign Currency Translation [line items]
Closing foreign exchange rate	$ 19.9487	$ 18.8452
Japanese yen [member]
Disclosure Of Foreign Currency Translation [line items]
Closing foreign exchange rate	0.1933	0.1734
Pounds Sterling [member]
Disclosure Of Foreign Currency Translation [line items]
Closing foreign exchange rate	27.2579	24.9586
Euro [member]
Disclosure Of Foreign Currency Translation [line items]
Closing foreign exchange rate	24.4052	21.1537
Swiss francs [member]
Disclosure Of Foreign Currency Translation [line items]
Closing foreign exchange rate	$ 22.5720	$ 19.4596

Leases - Additional Information

Leases - Additional Information (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)	Dec. 31, 2020MXN ($)	Dec. 31, 2019MXN ($)	Dec. 31, 2018MXN ($)
Disclosure of detailed information about borrowings [line items]
Lease liabilities		$ 63,184,128	$ 68,148,627	$ 70,651,797
Current lease liability	$ 406,389	8,106,937	5,847,085
Non-current lease liabilities	$ 2,760,941	$ 55,077,191	$ 62,301,542
PEMEX [Member] | Bottom of range [member]
Disclosure of detailed information about borrowings [line items]
Lease general term	1 year
PEMEX [Member] | Top of range [member]
Disclosure of detailed information about borrowings [line items]
Lease general term	3 years

Leases - Summary of right-of-us

Leases - Summary of right-of-use assets (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)	Dec. 31, 2020MXN ($)	Dec. 31, 2019MXN ($)
Disclosure of quantitative information about right-of-use assets [line items]
Beginning balance		$ 70,818,314	$ 72,760,580
Depreciation for the year		(6,611,022)	(7,534,049)
Cancellations		(5,476,350)
Additions		537,421	5,635,492
Currency translation effect		13,919	(43,709)
Impairment		(87,025)
Ending balance	$ 2,967,374	59,195,257	70,818,314
Transportation and storage equipment
Disclosure of quantitative information about right-of-use assets [line items]
Beginning balance		35,503,509	40,029,595
Depreciation for the year		(4,868,961)	(5,377,668)
Cancellations		(5,476,350)
Additions		97,891	895,291
Currency translation effect		12,292	(43,709)
Impairment		0
Ending balance		$ 25,268,381	35,503,509
Transportation and storage equipment | Bottom of range [member]
Disclosure of quantitative information about right-of-use assets [line items]
Estimated useful life	1 year	1 year
Transportation and storage equipment | Top of range [member]
Disclosure of quantitative information about right-of-use assets [line items]
Estimated useful life	10 years	10 years
Plants
Disclosure of quantitative information about right-of-use assets [line items]
Beginning balance		$ 25,693,459	24,099,662
Depreciation for the year		(1,869,775)	(1,854,894)
Additions			3,448,691
Impairment		0
Ending balance		$ 23,823,684	25,693,459
Estimated useful life	14 years	14 years
Drilling equipment
Disclosure of quantitative information about right-of-use assets [line items]
Beginning balance		$ 6,061,502	6,223,655
Depreciation for the year		(122,874)	(162,153)
Impairment		0
Ending balance		$ 5,938,628	6,061,502
Estimated useful life	10 years	10 years
Rights of use assets
Disclosure of quantitative information about right-of-use assets [line items]
Beginning balance		$ 1,835,949	1,922,291
Depreciation for the year		(84,399)	(86,342)
Impairment		(87,025)
Ending balance		$ 1,664,525	1,835,949
Estimated useful life	23 years	23 years
Port Facilities
Disclosure of quantitative information about right-of-use assets [line items]
Beginning balance		$ 1,623,453	371,348
Depreciation for the year		355,505	(33,949)
Additions		438,951	1,286,054
Impairment		0
Ending balance		$ 2,417,909	1,623,453
Estimated useful life	20 years	20 years
Buildings
Disclosure of quantitative information about right-of-use assets [line items]
Beginning balance		$ 65,212	75,771
Depreciation for the year		(17,567)	(16,015)
Additions			5,456
Currency translation effect		1,116
Impairment		0
Ending balance		$ 48,761	65,212
Buildings | Bottom of range [member]
Disclosure of quantitative information about right-of-use assets [line items]
Estimated useful life	1 year	1 year
Buildings | Top of range [member]
Disclosure of quantitative information about right-of-use assets [line items]
Estimated useful life	5 years	5 years
Lands
Disclosure of quantitative information about right-of-use assets [line items]
Beginning balance		$ 35,230	38,258
Depreciation for the year		(2,951)	(3,028)
Additions		579
Currency translation effect		511
Impairment		0
Ending balance		$ 33,369	$ 35,230
Estimated useful life	5 years	5 years

Leases - Summary of leases liab

Leases - Summary of leases liabilities (Detail) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disclosure of quantitative information about right-of-use assets [abstract]
Beginning balance	$ 68,148,627	$ 70,651,797
Additions	625,410	5,683,676
Cancellations	(6,578,337)	0
Payments of principal	(7,979,972)	(10,709,421)
Accrued interest	5,398,964	4,800,153
Interest paid	(2,030,829)
Foreign exchange	5,600,265	(2,277,578)
Ending balance	$ 63,184,128	$ 68,148,627

Leases - Summary of lease liabi

Leases - Summary of lease liabilities recognized in statement of comprehensive income (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)	Dec. 31, 2020MXN ($)	Dec. 31, 2019MXN ($)
Disclosure of quantitative information about right-of-use assets [abstract]
Depreciation of rights of use	$ 362,391	$ 7,229,231	$ 7,429,275
Interests from lease liabilities		5,784,476	5,360,072
Expenses related to short-term leases		$ 7,631	$ 58,701

Leases - Summary of lease lia_2

Leases - Summary of lease liabilities recognized in statement of cash flows (Detail) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disclosure of quantitative information about right-of-use assets [abstract]
Lease payments of principal and interest	$ (10,010,801)	$ (10,709,421)

Derivative Financial Instrume_3

Derivative Financial Instruments - Additional Information (Detail) € in Thousands, $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)Exchange_RateAgreement	Dec. 31, 2020MXN ($)Exchange_Rate	Dec. 31, 2019MXN ($)Exchange_Rate	Dec. 31, 2018MXN ($)	Dec. 31, 2017	Jun. 30, 2024USD ($)	Nov. 30, 2023MXN ($)	Nov. 30, 2022MXN ($)	Dec. 31, 2020MXN ($)Agreement	Dec. 31, 2020EUR (€)Agreement	Dec. 31, 2019USD ($)	Dec. 31, 2019MXN ($)	Dec. 31, 2019EUR (€)
Disclosure of detailed information about financial instruments [line items]
Confidence level percentage	95.00%	95.00%
Net loss	$ (25,518,054)	$ (509,052,065)	$ (282,112,024)	$ (180,419,837)
Increase decrease in exchange rate	10.00%	10.00%	10.00%	10.00%
Increase in occurs of crude oil hedge	$ (18,921)
Net gain (loss) of derivative financial instrument		$ 17,096,141	$ (23,263,923)	$ (19,115,951)
Net fair value of derivative financial instruments									$ 16,629,978			$ (5,153,841)
Derivative financial instruments designated as hedges									$ 0			$ 0
Increase [member]
Disclosure of detailed information about financial instruments [line items]
Net loss		168,334	180,408	192,025
Decrease [member]
Disclosure of detailed information about financial instruments [line items]
Net loss		$ 168,334	$ 180,408	$ 192,025
Us Dollar [member]
Disclosure of detailed information about financial instruments [line items]
Exchange rate | Exchange_Rate	19.9487	19.9487	18.8452
Euro [member]
Disclosure of detailed information about financial instruments [line items]
Exchange rate | Exchange_Rate	24.4052	24.4052	21.1537
Bottom of range [member]
Disclosure of detailed information about financial instruments [line items]
Liquidity risk mitigation amount through syndicated credit lines	$ 700,000
Top of range [member]
Disclosure of detailed information about financial instruments [line items]
Liquidity risk mitigation amount through syndicated credit lines	1,500,000
Liquidity risk mitigation amount through bilateral credit lines	$ 250,000
P.M.I. Holdings, B.V. [member]
Disclosure of detailed information about financial instruments [line items]
DFIs and debt portfolio to parallel shift basis points	10	10
Assumption of either an increase or decrease of basis points in floating interest rates of debt and corresponding hedges	25.00%	25.00%		25.00%	25.00%
Percentage of increase of DFIs and debt portfolio to exchange rates of currencies against the U.S. dollar	1.00%	1.00%
P.M.I. Holdings, B.V. [member] | Twenty five basis points higher [member]
Disclosure of detailed information about financial instruments [line items]
Net loss		$ 606,839	$ 644,506	$ 649,339
P.M.I. Holdings, B.V. [member] | Twenty five basis points lower [member]
Disclosure of detailed information about financial instruments [line items]
Net loss		$ 606,839	644,506	649,339
PMI Trading Ltd [member]
Disclosure of detailed information about financial instruments [line items]
Confidence level percentage	99.00%	99.00%
VaR recorded	$ (17,102)										$ (15,016)
PMI Trading Ltd [member] | Bottom of range [member]
Disclosure of detailed information about financial instruments [line items]
VaR recorded	(7,055)
PMI Trading Ltd [member] | Top of range [member]
Disclosure of detailed information about financial instruments [line items]
VaR recorded	$ (28,196)
Seagull option [member] | P.M.I. Norteamrica, S. A. de C. V. [member]
Disclosure of detailed information about financial instruments [line items]
Net foreign exchange gain		$ (128,949,304)	86,930,388	23,659,480
Percentage of PEMEX's debt in foreign currency	88.64%	88.64%
Seagull option [member] | P.M.I. Norteamrica, S. A. de C. V. [member] | Debt securities [member]
Disclosure of detailed information about financial instruments [line items]
Net foreign exchange gain		$ 122,099,058	$ 75,967,395	$ 19,762,208
Peso teasury portfolio [member] | P.M.I. Holdings, B.V. [member]
Disclosure of detailed information about financial instruments [line items]
Investment in Portfolio	(7.81)	(7.81)
Fondo laboral pemex portfolio [member] | P.M.I. Holdings, B.V. [member]
Disclosure of detailed information about financial instruments [line items]
Investment in Portfolio	0	0
U.S. Dollar Treasury Portfolio [member] | P.M.I. Holdings, B.V. [member]
Disclosure of detailed information about financial instruments [line items]
Investment in Portfolio	0	0
Interest rate risk [member] | Interest rate swaps [member] | P.M.I. Norteamrica, S. A. de C. V. [member]
Disclosure of detailed information about financial instruments [line items]
Aggregate notional amount	$ 24,190
Interest rate of derivative instrument	4.17%								4.17%	4.17%
Weighted average term of derivative instrument	1 year 4 months 27 days	1 year 4 months 27 days
Equity price risk [member]
Disclosure of detailed information about financial instruments [line items]
Number of barrels hedged			243,000	320,000
Amount of barrels hedged				149,588,000							178,268,000	178,268,000	178,268,000
Twenty day delta gamma risk analysis [member]
Disclosure of detailed information about financial instruments [line items]
Confidence level percentage	95.00%	95.00%
Number of observations	500	500
Risk expiring in june two thousand and nineteen [member] | P.M.I. Norteamrica, S. A. de C. V. [member]
Disclosure of detailed information about financial instruments [line items]
Revolving credit committed to mitigate liquidity risk						$ 5,500,000	$ 9,000,000	$ 28,000,000
Currency risk [member]
Disclosure of detailed information about financial instruments [line items]
Hedged risk exposure | €										€ 1,250,000			€ 725,000
Commodity price risk [member]
Disclosure of detailed information about financial instruments [line items]
Number of barrels hedged	332,500	332,500
Hedged risk exposure	$ 119,920
PEMEX [member] | Interest rate risk [member]
Disclosure of detailed information about financial instruments [line items]
Total net debt outstanding consisted of floating rate debt	14.30%	14.30%
PEMEX [member] | Interest rate risk [member] | Interest rate swaps [member]
Disclosure of detailed information about financial instruments [line items]
Number of interest rate swap agreements | Agreement	4								4	4
Aggregate notional amount	$ 956,250
Interest rate of derivative instrument	2.35%								2.35%	2.35%
Weighted average term of derivative instrument	4 years 3 months 18 days	4 years 3 months 18 days

Derivative Financial Instrume_4

Derivative Financial Instruments - Summary of debt instruments and DFI (Detail) $ in Thousands	Dec. 31, 2020USD ($)
Interest Rate Swaps [member]
Disclosure of detailed information about hedged items [line items]
Notional amount	$ 400,000
Interest Rate Options [Member]
Disclosure of detailed information about hedged items [line items]
Notional amount	(2,500,000)
Debt [member]
Disclosure of detailed information about hedged items [line items]
Notional amount	$ (3,972,777)

Derivative Financial Instrume_5

Derivative Financial Instruments - Details of Interest rate sensitivity (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)
CHF
Derivative Financial Instruments [line items]
Sensitivity debt	$ 1,472
Sensitivity DFIs	(1,318)
Sensitivity net	154
PEMEX Curves Sensitivity debt	1,352
Euro
Derivative Financial Instruments [line items]
Sensitivity debt	75,107
Sensitivity DFIs	(59,653)
Sensitivity net	15,454
PEMEX Curves Sensitivity debt	56,790
Pound sterling [member]
Derivative Financial Instruments [line items]
Sensitivity debt	4,123
Sensitivity DFIs	(3,845)
Sensitivity net	278
PEMEX Curves Sensitivity debt	3,469
Japan, yen [member]
Derivative Financial Instruments [line items]
Sensitivity debt	5,478
Sensitivity DFIs	(2,202)
Sensitivity net	3,276
PEMEX Curves Sensitivity debt	4,314
Peso
Derivative Financial Instruments [line items]
Sensitivity debt	32,446
Sensitivity DFIs	731
Sensitivity net	33,177
PEMEX Curves Sensitivity debt	25,855
Mexican Unidad de Inversion [member]
Derivative Financial Instruments [line items]
Sensitivity debt	12,935
Sensitivity DFIs	(12,935)
Sensitivity net	0
PEMEX Curves Sensitivity debt	7,093
U.S [member]
Derivative Financial Instruments [line items]
Sensitivity debt	1,425,168
Sensitivity DFIs	198,150
Sensitivity net	1,623,318
PEMEX Curves Sensitivity debt	$ 482,311

Derivative Financial Instrume_6

Derivative Financial Instruments - Details of Interest rate and currency Derivative Financial Instruments (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)
CHF
Disclosure of financial instruments by type of interest rate [line items]
Sensitivity Debt	$ 1,472
Sensitivity DFIs	(1,318)
Sensitivity Net	154
PEMEX Curves Sensitivity Debt	(5,840)
Euro
Disclosure of financial instruments by type of interest rate [line items]
Sensitivity Debt	75,107
Sensitivity DFIs	(59,653)
Sensitivity Net	15,454
PEMEX Curves Sensitivity Debt	(165,822)
Pound sterling [member]
Disclosure of financial instruments by type of interest rate [line items]
Sensitivity Debt	4,123
Sensitivity DFIs	(3,845)
Sensitivity Net	278
PEMEX Curves Sensitivity Debt	(11,535)
Japan, yen [member]
Disclosure of financial instruments by type of interest rate [line items]
Sensitivity Debt	5,478
Sensitivity DFIs	(2,202)
Sensitivity Net	3,276
PEMEX Curves Sensitivity Debt	(9,423)
Peso
Disclosure of financial instruments by type of interest rate [line items]
Sensitivity Debt	32,446
Sensitivity DFIs	731
Sensitivity Net	33,177
PEMEX Curves Sensitivity Debt	(121,302)
Mexican Unidad de Inversion [member]
Disclosure of financial instruments by type of interest rate [line items]
Sensitivity Debt	12,935
Sensitivity DFIs	(12,935)
Sensitivity Net	0
PEMEX Curves Sensitivity Debt	(15,376)
Interbank Yield Curves Sensitivity [member] | CHF
Disclosure of financial instruments by type of interest rate [line items]
Sensitivity Debt	(6,206)
Sensitivity DFIs	6,168
Sensitivity Net	(38)
VaR 95% Net	(29)
Interbank Yield Curves Sensitivity [member] | Euro
Disclosure of financial instruments by type of interest rate [line items]
Sensitivity Debt	(195,594)
Sensitivity DFIs	133,604
Sensitivity Net	(61,990)
VaR 95% Net	(47,729)
Interbank Yield Curves Sensitivity [member] | Pound sterling [member]
Disclosure of financial instruments by type of interest rate [line items]
Sensitivity Debt	(12,857)
Sensitivity DFIs	12,804
Sensitivity Net	(54)
VaR 95% Net	(53)
Interbank Yield Curves Sensitivity [member] | Japan, yen [member]
Disclosure of financial instruments by type of interest rate [line items]
Sensitivity Debt	(11,453)
Sensitivity DFIs	3,123
Sensitivity Net	(8,330)
VaR 95% Net	(6,304)
Interbank Yield Curves Sensitivity [member] | Peso
Disclosure of financial instruments by type of interest rate [line items]
Sensitivity Debt	(138,257)
Sensitivity DFIs	(18,326)
Sensitivity Net	(156,583)
VaR 95% Net	(247,424)
Interbank Yield Curves Sensitivity [member] | Mexican Unidad de Inversion [member]
Disclosure of financial instruments by type of interest rate [line items]
Sensitivity Debt	(21,795)
Sensitivity DFIs	21,795
Sensitivity Net	0
VaR 95% Net	$ 0

Derivative Financial Instrume_7

Derivative Financial Instruments - Details of current and potential exposures and aggregated by credit rating (Detail) $ in Thousands	Dec. 31, 2020USD ($)
Current [member] | A + [Member]
Derivative Financial Instruments [line items]
Maximum Credit Exposure by term in Petroleos Mexicanos	$ 159,107
Current [member] | A [member]
Derivative Financial Instruments [line items]
Maximum Credit Exposure by term in Petroleos Mexicanos	18,079
Current [member] | A - [member]
Derivative Financial Instruments [line items]
Maximum Credit Exposure by term in Petroleos Mexicanos	(19,996)
Current [member] | BBB + [member]
Derivative Financial Instruments [line items]
Maximum Credit Exposure by term in Petroleos Mexicanos	397,989
Current [member] | BBB [member]
Derivative Financial Instruments [line items]
Maximum Credit Exposure by term in Petroleos Mexicanos	211,862
Current [member] | BBB- [member]
Derivative Financial Instruments [line items]
Maximum Credit Exposure by term in Petroleos Mexicanos	(10,213)
Less than 1 year [member] | A + [Member]
Derivative Financial Instruments [line items]
Maximum Credit Exposure by term in Petroleos Mexicanos	688,392
Less than 1 year [member] | A [member]
Derivative Financial Instruments [line items]
Maximum Credit Exposure by term in Petroleos Mexicanos	248,971
Less than 1 year [member] | A - [member]
Derivative Financial Instruments [line items]
Maximum Credit Exposure by term in Petroleos Mexicanos	365,910
Less than 1 year [member] | BBB + [member]
Derivative Financial Instruments [line items]
Maximum Credit Exposure by term in Petroleos Mexicanos	546,936
Less than 1 year [member] | BBB [member]
Derivative Financial Instruments [line items]
Maximum Credit Exposure by term in Petroleos Mexicanos	466,967
Less than 1 year [member] | BBB- [member]
Derivative Financial Instruments [line items]
Maximum Credit Exposure by term in Petroleos Mexicanos	99,334
One to Three Year [member] | A + [Member]
Derivative Financial Instruments [line items]
Maximum Credit Exposure by term in Petroleos Mexicanos	558,981
One to Three Year [member] | A [member]
Derivative Financial Instruments [line items]
Maximum Credit Exposure by term in Petroleos Mexicanos	338,829
One to Three Year [member] | A - [member]
Derivative Financial Instruments [line items]
Maximum Credit Exposure by term in Petroleos Mexicanos	294,322
One to Three Year [member] | BBB + [member]
Derivative Financial Instruments [line items]
Maximum Credit Exposure by term in Petroleos Mexicanos	720,605
One to Three Year [member] | BBB [member]
Derivative Financial Instruments [line items]
Maximum Credit Exposure by term in Petroleos Mexicanos	767,225
One to Three Year [member] | BBB- [member]
Derivative Financial Instruments [line items]
Maximum Credit Exposure by term in Petroleos Mexicanos	178,698
3-5 years [member] | A + [Member]
Derivative Financial Instruments [line items]
Maximum Credit Exposure by term in Petroleos Mexicanos	306,952
3-5 years [member] | A [member]
Derivative Financial Instruments [line items]
Maximum Credit Exposure by term in Petroleos Mexicanos	301,736
3-5 years [member] | A - [member]
Derivative Financial Instruments [line items]
Maximum Credit Exposure by term in Petroleos Mexicanos	131,104
3-5 years [member] | BBB + [member]
Derivative Financial Instruments [line items]
Maximum Credit Exposure by term in Petroleos Mexicanos	613,680
3-5 years [member] | BBB [member]
Derivative Financial Instruments [line items]
Maximum Credit Exposure by term in Petroleos Mexicanos	867,931
3-5 years [member] | BBB- [member]
Derivative Financial Instruments [line items]
Maximum Credit Exposure by term in Petroleos Mexicanos	175,904
5-7 years [member] | A + [Member]
Derivative Financial Instruments [line items]
Maximum Credit Exposure by term in Petroleos Mexicanos	117,716
5-7 years [member] | A [member]
Derivative Financial Instruments [line items]
Maximum Credit Exposure by term in Petroleos Mexicanos	167,414
5-7 years [member] | A - [member]
Derivative Financial Instruments [line items]
Maximum Credit Exposure by term in Petroleos Mexicanos	122,823
5-7 years [member] | BBB + [member]
Derivative Financial Instruments [line items]
Maximum Credit Exposure by term in Petroleos Mexicanos	556,650
5-7 years [member] | BBB [member]
Derivative Financial Instruments [line items]
Maximum Credit Exposure by term in Petroleos Mexicanos	648,179
5-7 years [member] | BBB- [member]
Derivative Financial Instruments [line items]
Maximum Credit Exposure by term in Petroleos Mexicanos	136,312
7-10 years [member] | A + [Member]
Derivative Financial Instruments [line items]
Maximum Credit Exposure by term in Petroleos Mexicanos	119,358
7-10 years [member] | A [member]
Derivative Financial Instruments [line items]
Maximum Credit Exposure by term in Petroleos Mexicanos	100,000
7-10 years [member] | A - [member]
Derivative Financial Instruments [line items]
Maximum Credit Exposure by term in Petroleos Mexicanos	0
7-10 years [member] | BBB + [member]
Derivative Financial Instruments [line items]
Maximum Credit Exposure by term in Petroleos Mexicanos	261,542
7-10 years [member] | BBB [member]
Derivative Financial Instruments [line items]
Maximum Credit Exposure by term in Petroleos Mexicanos	438,457
7-10 years [member] | BBB- [member]
Derivative Financial Instruments [line items]
Maximum Credit Exposure by term in Petroleos Mexicanos	139,725
More than 10 years [member] | A + [Member]
Derivative Financial Instruments [line items]
Maximum Credit Exposure by term in Petroleos Mexicanos	0
More than 10 years [member] | A [member]
Derivative Financial Instruments [line items]
Maximum Credit Exposure by term in Petroleos Mexicanos	0
More than 10 years [member] | A - [member]
Derivative Financial Instruments [line items]
Maximum Credit Exposure by term in Petroleos Mexicanos	0
More than 10 years [member] | BBB + [member]
Derivative Financial Instruments [line items]
Maximum Credit Exposure by term in Petroleos Mexicanos	174,457
More than 10 years [member] | BBB [member]
Derivative Financial Instruments [line items]
Maximum Credit Exposure by term in Petroleos Mexicanos	320,565
More than 10 years [member] | BBB- [member]
Derivative Financial Instruments [line items]
Maximum Credit Exposure by term in Petroleos Mexicanos	$ 0

Derivative Financial Instrume_8

Derivative Financial Instruments - Details of quantitative disclosure of debt cash flow maturities (Detail) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
2021
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	$ 348,440,415	$ 211,777,379
2021 | Fixed rate (U.S. dollars) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	47,898,708	52,874,594
2021 | Fixed rate (pesos) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	115,284,491	10,009,595
2021 | Fixed rate (UDIs) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	4,314,460	5,137,194
2021 | Fixed rate (euros) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	42,716,224	27,490,652
2021 | Fixed rate (Swiss francs) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	3,385,165	11,669,169
2021 | Fixed rate [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	213,599,047	107,181,204
2021 | Variable rate (U.S. dollars) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	122,317,252	37,129,938
2021 | Variable rate (Japanese yen) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt		11,097,600
2021 | Variable rate (euros) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt		983,647
2021 | Variable rate (pesos) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	12,524,115	55,384,990
2021 | Variable rate [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	134,841,368	104,596,175
2022
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	117,932,866	123,198,629
2022 | Fixed rate (U.S. dollars) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	32,956,060	36,474,941
2022 | Fixed rate (Pounds) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	9,537,663
2022 | Fixed rate (pesos) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	1,999,401	20,004,204
2022 | Fixed rate (UDIs) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt		4,183,481
2022 | Fixed rate (euros) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	38,987,905	36,993,461
2022 | Fixed rate (Swiss francs) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt		2,920,578
2022 | Fixed rate [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	83,481,030	100,576,665
2022 | Variable rate (U.S. dollars) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	25,979,932	14,165,499
2022 | Variable rate (Japanese yen) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt		0
2022 | Variable rate (pesos) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	8,471,904	8,456,465
2022 | Variable rate [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	34,451,836	22,621,964
2023
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	131,155,018	112,871,442
2023 | Fixed rate (U.S. dollars) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	48,471,704	36,288,484
2023 | Fixed rate (Japanese yen) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	5,799,000
2023 | Fixed rate (Pounds) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt		8,725,102
2023 | Fixed rate (pesos) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt		1,999,293
2023 | Fixed rate (UDIs) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt		0
2023 | Fixed rate (euros) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	34,137,539	33,752,122
2023 | Fixed rate (Swiss francs) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	8,228,615	0
2023 | Fixed rate [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	96,636,858	80,765,001
2023 | Variable rate (U.S. dollars) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	11,649,479	23,671,360
2023 | Variable rate (euros) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	15,842,049
2023 | Variable rate (pesos) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	7,026,631	8,435,081
2023 | Variable rate [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	34,518,160	32,106,441
2024
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	181,061,085	125,320,439
2024 | Fixed rate (U.S. dollars) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	25,996,376	51,814,555
2024 | Fixed rate (Japanese yen) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt		5,202,000
2024 | Fixed rate (Pounds) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt		0
2024 | Fixed rate (pesos) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	57,433,886	0
2024 | Fixed rate (euros) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	30,418,586	29,564,507
2024 | Fixed rate (Swiss francs) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt		7,081,249
2024 | Fixed rate [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	113,848,848	93,662,311
2024 | Variable rate (U.S. dollars) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	56,443,974	10,931,702
2024 | Variable rate (euros) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt		13,734,663
2024 | Variable rate (pesos) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	10,768,263	6,991,763
2024 | Variable rate [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	67,212,237	31,658,128
2025
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	114,228,026	171,955,593
2025 | Fixed rate (U.S. dollars) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	49,333,976	24,377,105
2025 | Fixed rate (Japanese yen) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt		0
2025 | Fixed rate (Pounds) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	12,204,125
2025 | Fixed rate (pesos) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt		57,381,081
2025 | Fixed rate (euros) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	40,230,700	26,321,684
2025 | Fixed rate (Swiss francs) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt		0
2025 | Fixed rate [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	101,768,801	108,079,870
2025 | Variable rate (U.S. dollars) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	5,602,565	53,275,137
2025 | Variable rate (euros) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt		0
2025 | Variable rate (pesos) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	6,856,660	10,600,586
2025 | Variable rate [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	12,459,225	63,875,723
2026 Thereafter
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	1,323,253,056	1,204,903,800
2026 Thereafter | Fixed rate (U.S. dollars) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	1,116,179,110	959,097,000
2026 Thereafter | Fixed rate (Japanese yen) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	15,444,790	13,848,692
2026 Thereafter | Fixed rate (Pounds) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt		11,157,892
2026 Thereafter | Fixed rate (pesos) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	31,029,696	30,985,764
2026 Thereafter | Fixed rate (UDIs) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	33,031,555	32,067,846
2026 Thereafter | Fixed rate (euros) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	117,736,691	136,705,664
2026 Thereafter | Fixed rate [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	1,313,421,841	1,183,862,858
2026 Thereafter | Variable rate (U.S. dollars) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	9,506,180	14,051,426
2026 Thereafter | Variable rate (pesos) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	325,035	6,989,516
2026 Thereafter | Variable rate [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	9,831,215	21,040,942
Net Carrying Amount
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	2,216,070,465	1,950,027,282
Net Carrying Amount | Fixed rate (U.S. dollars) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	$ 1,320,835,934	$ 1,160,926,679
Average interest rate (%)	6.37%	6.2535%
Net Carrying Amount | Fixed rate (Japanese yen) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	$ 21,243,790	$ 19,050,692
Average interest rate (%)	1.35%	1.3483%
Net Carrying Amount | Fixed rate (Pounds) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	$ 21,741,788	$ 19,882,994
Average interest rate (%)	5.72%	5.7247%
Net Carrying Amount | Fixed rate (pesos) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	$ 205,747,474	$ 120,379,937
Average interest rate (%)	7.91%	7.4867%
Net Carrying Amount | Fixed rate (UDIs) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	$ 37,346,014	$ 41,388,521
Average interest rate (%)	4.03%	4.0514%
Net Carrying Amount | Fixed rate (euros) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	$ 304,227,645	$ 290,828,090
Average interest rate (%)	3.77%	3.7095%
Net Carrying Amount | Fixed rate (Swiss francs) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	$ 11,613,780	$ 21,670,996
Average interest rate (%)	1.93%	1.6996%
Net Carrying Amount | Fixed rate [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	$ 1,922,756,425	$ 1,674,127,909
Net Carrying Amount | Variable rate (U.S. dollars) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	231,499,382	153,225,062
Net Carrying Amount | Variable rate (Japanese yen) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt		11,097,600
Net Carrying Amount | Variable rate (euros) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	15,842,049	14,718,310
Net Carrying Amount | Variable rate (pesos) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	45,972,609	96,858,401
Net Carrying Amount | Variable rate [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	293,314,040	275,899,373
Fair value
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	2,232,694,117	2,036,457,122
Fair value | Fixed rate (U.S. dollars) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	1,347,156,276	1,233,260,685
Fair value | Fixed rate (Japanese yen) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	18,797,463	17,812,094
Fair value | Fixed rate (Pounds) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	23,010,709	21,733,929
Fair value | Fixed rate (pesos) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	199,047,983	114,148,170
Fair value | Fixed rate (UDIs) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	30,673,537	37,209,163
Fair value | Fixed rate (euros) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	315,417,306	314,159,720
Fair value | Fixed rate (Swiss francs) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	11,650,958	22,167,273
Fair value | Fixed rate [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	1,945,754,232	1,760,491,034
Fair value | Variable rate (U.S. dollars) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	228,630,238	153,747,749
Fair value | Variable rate (Japanese yen) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt		11,112,957
Fair value | Variable rate (euros) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	15,375,645	14,969,735
Fair value | Variable rate (pesos) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	42,934,001	96,135,647
Fair value | Variable rate [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	$ 286,939,885	$ 275,966,088

Derivative Financial Instrume_9

Derivative Financial Instruments - Details of quantitative disclosure of debt cash flow's maturities (Parenthetical) (Detail)	May 11, 2021Exchange_Rate	Dec. 31, 2020	Dec. 31, 2019
Disclosure of maturity analysis for derivative financial liabilities [line items]
Exchange rates	19.9223	19.9487
U.S [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Exchange rates		19.9487	18.8452
Japan, yen [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Exchange rates		0.1933	0.1734
Pound sterling [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Exchange rates		27.2579	24.9586
Mexican Unidad de Inversion [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Exchange rates		6.605597	6.399018
Euro
Disclosure of maturity analysis for derivative financial liabilities [line items]
Exchange rates		24.4052	21.1537
Switzerland, Francs [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Exchange rates		22.5720	19.4596

Derivative Financial Instrum_10

Derivative Financial Instruments - Summary of Quantitative Disclosure of Cash Flow's Maturities (Detail) - MXN ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Currency Options Position One [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Currency Options	$ 15,456,770	$ 13,881,133
Currency options position two [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Currency Options	121,240,404	105,123,586
Currency options position three [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Currency Options	12,271,443	11,242,387
Currency options position four [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Currency Options	8,225,571	7,116,252
Currency options position five [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Currency Options	104,181,452	66,560,662
2021 | Currency options position two [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Currency Options	42,647,378	36,978,146
2021 | Currency options position three [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Currency Options	0
2021 | Currency options position five [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Currency Options	14,621,958	12,678,221
2022 | Currency options position four [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Currency Options	8,225,571	7,116,252
2022 | Currency options position five [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Currency Options	15,840,455	13,734,740
2023 | Currency options position two [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Currency Options	30,462,413	26,412,961
2024 | Currency options position two [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Currency Options	17,668,200
2024 | Currency options position three [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Currency Options	12,271,443
2024 | Currency options position five [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Currency Options	15,840,455
2025 | Currency Options Position One [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Currency Options		13,881,133
2025 | Currency options position two [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Currency Options		41,732,479
2025 | Currency options position three [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Currency Options		11,242,387
2025 | Currency options position five [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Currency Options		40,147,701
2026 thereafter [member] | Currency Options Position One [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Currency Options	15,456,770
2026 thereafter [member] | Currency options position two [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Currency Options	30,462,413
2026 thereafter [member] | Currency options position three [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Currency Options	0
2026 thereafter [member] | Currency options position five [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Currency Options	57,878,585
Fair value | Currency Options Position One [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Currency Options	14,918	123,244
Fair value | Currency options position two [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Currency Options	3,167,805	360,731
Fair value | Currency options position three [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Currency Options	(85,994)	(81,137)
Fair value | Currency options position four [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Currency Options	(70,196)	(74,535)
Fair value | Currency options position five [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Currency Options	$ (2,118,100)	$ (1,223,283)
U.S [member] | Interest Rate Swap 1 [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Variable to fixed	19,558,505	22,982,341
U.S [member] | Interest Rate Options Position 1 [Member] | LIBOR [Member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Buy And Sell Interest Rate Option	$ 49,871,750
U.S [member] | 2021 | Interest Rate Swap 1 [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Variable to fixed		4,505,751
Average pay rate	3.22%	3.20%
Average receive rate	0.90%	3.00%
U.S [member] | 2021 | Interest Rate Swap 1 [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Variable to fixed	4,724,765	4,463,405
Average pay rate	3.25%	3.22%
Average receive rate	0.91%	2.80%
U.S [member] | 2022 | Interest Rate Swap 1 [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Variable to fixed	4,607,486	4,352,614
Average pay rate	3.37%	3.25%
Average receive rate	1.12%	2.94%
U.S [member] | 2023 | Interest Rate Swap 1 [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Variable to fixed	4,466,068	4,219,019
Average pay rate	3.68%	3.37%
Average receive rate	1.67%	3.17%
U.S [member] | 2023 | Interest Rate Options Position 1 [Member] | LIBOR [Member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Buy And Sell Interest Rate Option	$ 49,871,750
U.S [member] | 2024 | Interest Rate Swap 1 [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Variable to fixed	3,316,471	3,133,015
Average pay rate	4.13%	3.68%
Average receive rate	2.38%	3.67%
U.S [member] | 2025 | Interest Rate Swap 1 [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Variable to fixed	2,443,716	2,308,537
Average pay rate		4.13%
Average receive rate		4.36%
U.S [member] | 2026 thereafter [member] | Interest Rate Swap 1 [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Average pay rate	0.00%
Average receive rate	0.00%
U.S [member] | Fair value | Interest Rate Swap 1 [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Variable to fixed	(712,107)	(99,231)
U.S [member] | Fair value | Interest Rate Options Position 1 [Member] | LIBOR [Member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Buy And Sell Interest Rate Option	$ (1,331,188)
Receive euros pay us dollars [member] | Cross - currency swaps [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Received cross currency swaps	292,851,648	$ 306,989,551
Receive euros pay us dollars [member] | 2020 [member] | Cross - currency swaps [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Received cross currency swaps		27,352,677
Receive euros pay us dollars [member] | 2021 | Cross - currency swaps [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Received cross currency swaps	37,204,824	35,146,769
Receive euros pay us dollars [member] | 2021 | Cross - currency swaps [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Received cross currency swaps	35,595,644	33,626,604
Receive euros pay us dollars [member] | 2022 | Cross - currency swaps [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Received cross currency swaps	46,550,277	43,975,261
Receive euros pay us dollars [member] | 2023 | Cross - currency swaps [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Received cross currency swaps	26,565,185	25,095,682
Receive euros pay us dollars [member] | 2024 | Cross - currency swaps [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Received cross currency swaps	39,334,093
Receive euros pay us dollars [member] | 2025 | Cross - currency swaps [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Received cross currency swaps		141,792,559
Receive euros pay us dollars [member] | 2026 thereafter [member] | Cross - currency swaps [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Received cross currency swaps	107,601,624
Receive euros pay us dollars [member] | Fair value | Cross - currency swaps [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Received cross currency swaps	9,939,110	(6,129,828)
Receive Japanese yen pay us dollars [member] | Cross - currency swaps [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Received cross currency swaps	4,814,650	16,967,427
Receive Japanese yen pay us dollars [member] | 2020 [member] | Cross - currency swaps [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Received cross currency swaps		12,419,108
Receive Japanese yen pay us dollars [member] | 2022 | Cross - currency swaps [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Received cross currency swaps	4,814,650	4,548,319
Receive Japanese yen pay us dollars [member] | Fair value | Cross - currency swaps [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Received cross currency swaps	505,772	(1,087,602)
Receive pounds sterling pay us dollars [member] | Cross - currency swaps [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Received cross currency swaps	21,584,035	20,354,324
Receive pounds sterling pay us dollars [member] | 2021 | Cross - currency swaps [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Received cross currency swaps	9,781,187	9,204,373
Receive pounds sterling pay us dollars [member] | 2024 | Cross - currency swaps [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Received cross currency swaps	11,802,848
Receive pounds sterling pay us dollars [member] | 2025 | Cross - currency swaps [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Received cross currency swaps		11,149,951
Receive pounds sterling pay us dollars [member] | Fair value | Cross - currency swaps [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Received cross currency swaps	839,037	516,780
Receive UDI/ Pay pesos [member] | Cross - currency swaps [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Received cross currency swaps	33,513,214	37,742,553
Receive UDI/ Pay pesos [member] | 2020 [member] | Cross - currency swaps [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Received cross currency swaps		7,292,520
Receive UDI/ Pay pesos [member] | 2021 | Cross - currency swaps [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Received cross currency swaps	3,000,000	3,000,000
Receive UDI/ Pay pesos [member] | 2024 | Cross - currency swaps [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Received cross currency swaps	3,063,181
Receive UDI/ Pay pesos [member] | 2025 | Cross - currency swaps [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Received cross currency swaps		27,450,032
Receive UDI/ Pay pesos [member] | 2026 thereafter [member] | Cross - currency swaps [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Received cross currency swaps	27,450,032
Receive UDI/ Pay pesos [member] | Fair value | Cross - currency swaps [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Received cross currency swaps	6,834,051	3,116,439
Receive swiss francs pay us dollars [member] | Cross - currency swaps [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Received cross currency swaps	10,300,166	20,729,537
Receive swiss francs pay us dollars [member] | 2020 [member] | Cross - currency swaps [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Received cross currency swaps		10,999,144
Receive swiss francs pay us dollars [member] | 2021 | Cross - currency swaps [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Received cross currency swaps	3,018,890	2,851,895
Receive swiss francs pay us dollars [member] | 2022 | Cross - currency swaps [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Received cross currency swaps	7,281,276	6,878,498
Receive swiss francs pay us dollars [member] | Fair value | Cross - currency swaps [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Received cross currency swaps	$ 913,809	$ 797,159

Derivative Financial Instrum_11

Derivative Financial Instruments - Summary of Quantitative Disclosure of Cash Flow's Maturities (Parenthetical) (Detail)	May 11, 2021Exchange_Rate	Dec. 31, 2020	Dec. 31, 2019
Disclosure of maturity analysis for derivative financial liabilities [line items]
Exchange rates	19.9223	19.9487
U.S [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Exchange rates		19.9487	18.8452
Euro
Disclosure of maturity analysis for derivative financial liabilities [line items]
Exchange rates		24.4052	21.1537

Derivative Financial Instrum_12

Derivative Financial Instruments - Summary of Financial Liabilities Interest And Principal Cash Flow Maturities (Detail) $ in Thousands, $ in Thousands	Dec. 31, 2020USD ($)	Dec. 31, 2020MXN ($)	Dec. 31, 2019MXN ($)	Nov. 25, 2019USD ($)	Nov. 25, 2019MXN ($)	Dec. 31, 2018MXN ($)	Dec. 28, 2018USD ($)	Dec. 28, 2018MXN ($)
Disclosure Of Financial Liabilities Interest And Principal Cash Flow Maturities [Line Items]
Suppliers	$ 14,135,159	$ 281,978,041	$ 208,034,407
Accounts and accrued expenses payable	$ 1,539,423	30,709,497	26,055,151
Leases		63,184,128	68,148,627			$ 70,651,797
Debt		2,232,694,117	2,035,079,540	$ 1,851,000	$ 34,875,000		$ 5,640,000	$ 112,000,000
Carrying amount [member]
Disclosure Of Financial Liabilities Interest And Principal Cash Flow Maturities [Line Items]
Suppliers		281,978,041	208,034,407
Accounts and accrued expenses payable		30,709,497	26,055,151
Leases		63,184,128	68,148,627
Debt		2,258,727,317	1,983,174,088
Total		2,634,598,983	2,285,412,273
2020 [member]
Disclosure Of Financial Liabilities Interest And Principal Cash Flow Maturities [Line Items]
Suppliers			208,034,407
Accounts and accrued expenses payable			26,055,151
Leases			11,424,336
Debt			312,757,186
2020
Disclosure Of Financial Liabilities Interest And Principal Cash Flow Maturities [Line Items]
Suppliers		281,978,041
Accounts and accrued expenses payable		30,709,497
Leases		12,899,935	9,982,471
Debt		386,573,778	222,227,670
Total			558,271,080
2021
Disclosure Of Financial Liabilities Interest And Principal Cash Flow Maturities [Line Items]
Leases		8,695,992	9,507,408
Debt		230,702,075	205,355,068
Total		712,161,251	232,210,141
2022
Disclosure Of Financial Liabilities Interest And Principal Cash Flow Maturities [Line Items]
Leases		8,660,013	9,493,269
Debt		322,593,741	213,879,603
Total		239,398,067	214,862,476
2023
Disclosure Of Financial Liabilities Interest And Principal Cash Flow Maturities [Line Items]
Leases		8,151,473	9,361,805
Debt		277,735,672	254,613,606
Total		331,253,754	223,372,872
2024
Disclosure Of Financial Liabilities Interest And Principal Cash Flow Maturities [Line Items]
Leases		7,392,278
Debt		203,016,590
Total		285,887,145	263,975,411
2025
Disclosure Of Financial Liabilities Interest And Principal Cash Flow Maturities [Line Items]
Leases			62,776,808
Debt			2,104,560,030
Total		210,408,868	2,167,336,838
2026 Thereafter
Disclosure Of Financial Liabilities Interest And Principal Cash Flow Maturities [Line Items]
Leases		54,962,972
Debt		2,243,851,381
Total		2,298,814,353
Total [Member]
Disclosure Of Financial Liabilities Interest And Principal Cash Flow Maturities [Line Items]
Suppliers		281,978,041	208,034,407
Accounts and accrued expenses payable		30,709,497	26,055,151
Leases		100,762,663	112,546,097
Debt		3,664,473,237	3,313,393,163
Total		$ 4,077,923,438	$ 3,660,028,818

Derivative Financial Instrum_13

Derivative Financial Instruments - Summary of Financial Liabilities Interest And Principal Cash Flow Maturities (Parenthetical) (Detail)	May 11, 2021Exchange_Rate	Dec. 31, 2020	Dec. 31, 2019
Disclosure of maturity analysis for derivative financial liabilities [line items]
Currency exchange rate	19.9223	19.9487
U.S [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Currency exchange rate		19.9487	18.8452
Japan, yen [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Currency exchange rate		0.1933	0.1734
Pound sterling [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Currency exchange rate		27.2579	24.9586
Mexican Unidad de Inversion [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Currency exchange rate		6.605597	6.399018
Euro
Disclosure of maturity analysis for derivative financial liabilities [line items]
Currency exchange rate		24.4052	21.1537
Switzerland, Francs [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Currency exchange rate		22.5720	19.4596

Derivative Financial Instrum_14

Derivative Financial Instruments - Summary of Fair Values and Notional Amounts of DFIs that were designated as non-hedges (Detail) $ in Thousands	Dec. 31, 2020MXN ($)MMB	Dec. 31, 2019MXN ($)MMB
Disclosure of detailed information about hedging instruments [line items]
Fair Value	$ 17,896,918	$ (3,781,263)
Interest Rate Swaps Position One [member]
Disclosure of detailed information about hedging instruments [line items]
Notional amount	9,350,953	11,189,338
Fair Value	(330,814)	(79,096)
Interest Rate Swaps Position Two [member]
Disclosure of detailed information about hedging instruments [line items]
Notional amount	9,724,991	11,024,442
Fair Value	(370,094)	(9,181)
Cross Currency Swaps Position One [member]
Disclosure of detailed information about hedging instruments [line items]
Notional amount	33,513,214	37,742,553
Fair Value	6,834,051	3,116,439
Cross Currency Swaps Position Two [member]
Disclosure of detailed information about hedging instruments [line items]
Notional amount		12,419,108
Fair Value		(1,403,975)
Cross Currency Swaps Position Three [member]
Disclosure of detailed information about hedging instruments [line items]
Notional amount	4,814,650	4,548,319
Fair Value	505,772	316,373
Cross Currency Swaps Position Four [member]
Disclosure of detailed information about hedging instruments [line items]
Notional amount	15,277,498	14,432,394
Fair Value	761,958	(523,552)
Cross Currency Swaps Position Five [member]
Disclosure of detailed information about hedging instruments [line items]
Notional amount	277,574,150	292,557,157
Fair Value	9,177,152	(5,606,276)
Cross Currency Swaps Position Six [member]
Disclosure of detailed information about hedging instruments [line items]
Notional amount	9,781,187	9,204,373
Fair Value	712,072	526,632
Cross Currency Swaps Position Seven [member]
Disclosure of detailed information about hedging instruments [line items]
Notional amount	10,300,166	20,729,537
Fair Value	913,809	797,159
Cross Currency Swaps Position Eight [member]
Disclosure of detailed information about hedging instruments [line items]
Notional amount	11,802,848	11,149,951
Fair Value	126,965	(9,852)
Currency Options Position One [member]
Disclosure of detailed information about hedging instruments [line items]
Notional amount	15,456,770	13,881,133
Fair Value	14,918	123,244
Currency options position two [member]
Disclosure of detailed information about hedging instruments [line items]
Notional amount	121,240,404	105,123,586
Fair Value	3,167,805	360,731
Currency options position three [member]
Disclosure of detailed information about hedging instruments [line items]
Notional amount	12,271,443	11,242,387
Fair Value	(85,994)	(81,137)
Currency options position four [member]
Disclosure of detailed information about hedging instruments [line items]
Notional amount	8,225,571	7,116,252
Fair Value	(70,196)	(74,535)
Currency options position five [member]
Disclosure of detailed information about hedging instruments [line items]
Notional amount	104,181,452	66,560,662
Fair Value	(2,118,100)	(1,223,283)
Interest Rate Swaps Position Three [member]
Disclosure of detailed information about hedging instruments [line items]
Notional amount	482,561	768,561
Fair Value	$ (11,199)	$ (10,954)
Futures [member] | Exchange trade [member]
Disclosure of detailed information about hedging instruments [line items]
Volume | MMB	0.64	2.4
Fair Value	$ (32,340)	$ (124,835)
Petroleum product swaps [member] | Exchange trade [member]
Disclosure of detailed information about hedging instruments [line items]
Volume | MMB	(1.48)	4.3
Fair Value	$ (95,572)	$ (318,410)
Interest Rate Options Position One [Member]
Disclosure of detailed information about hedging instruments [line items]
Notional amount	49,871,750
Fair Value	$ (1,331,187)
Crude Oil Options Position One [Member]
Disclosure of detailed information about hedging instruments [line items]
Volume | MMB	55.20	85.05
Fair Value	$ (1,266,940)	$ (1,372,577)

Derivative Financial Instrum_15

Derivative Financial Instruments - Summary of Location on the Consolidated Statement of Financial Position and the Fair Value of DFIs (Detail) - MXN ($)	Dec. 31, 2020	Dec. 31, 2019
Disclosure of detailed information about financial instruments [line items]
Fair value	$ 25,947,993,000	$ 11,496,330,000
Net total	16,629,978,000	(5,153,841,000)
Crude oil options [member]
Disclosure of detailed information about financial instruments [line items]
Fair value	0
Currency Options [member]
Disclosure of detailed information about financial instruments [line items]
Fair value	3,184,942,000	559,751,000
Natural gas options [member]
Disclosure of detailed information about financial instruments [line items]
Fair value	0
Cross - currency swaps [member]
Disclosure of detailed information about financial instruments [line items]
Fair value	22,763,051,000	10,936,579,000
Natural gas swaps [member]
Disclosure of detailed information about financial instruments [line items]
Fair value	0
Interest rate swaps [member]
Disclosure of detailed information about financial instruments [line items]
Fair value	0
Others [member]
Disclosure of detailed information about financial instruments [line items]
Fair value	0
Derivatives not designated as hedges [member]
Disclosure of detailed information about financial instruments [line items]
Derivatives liabilities	(9,318,015,000)	(16,650,171,000)
Derivatives not designated as hedges [member] | Crude oil options [member]
Disclosure of detailed information about financial instruments [line items]
Derivatives liabilities	126.694	137.2577
Derivatives not designated as hedges [member] | Currency Options [member]
Disclosure of detailed information about financial instruments [line items]
Derivatives liabilities	(2,219,000)	(75,776,000)
Derivatives not designated as hedges [member] | Natural gas options [member]
Disclosure of detailed information about financial instruments [line items]
Derivatives liabilities	0	0
Derivatives not designated as hedges [member] | Cross - currency swaps [member]
Disclosure of detailed information about financial instruments [line items]
Derivatives liabilities	(6,005,562,000)	(15,102,586,000)
Derivatives not designated as hedges [member] | Natural gas swaps [member]
Disclosure of detailed information about financial instruments [line items]
Derivatives liabilities	0	0
Derivatives not designated as hedges [member] | Interest rate swaps [member]
Disclosure of detailed information about financial instruments [line items]
Derivatives liabilities	(712,107,000)	(99,232,000)
Derivatives not designated as hedges [member] | Others [member]
Disclosure of detailed information about financial instruments [line items]
Derivatives liabilities	0	$ 0
Derivatives not designated as hedges [member] | Interest Rate Options [Member]
Disclosure of detailed information about financial instruments [line items]
Derivatives liabilities	$ (1,331,187,000)

Derivative Financial Instrum_16

Derivative Financial Instruments - Summary of Net Gain (Loss) Recognized in Income on Derivative Financial Instruments (Detail) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of detailed information about financial instruments [line items]
Net gain loss on derivatives	$ 17,096,141	$ (23,263,923)	$ (19,115,951)
Interest Rate Options [Member]
Disclosure of detailed information about financial instruments [line items]
Net gain loss on derivatives	(1,802,514)
Crude Oil Futures Swaps [Member]
Disclosure of detailed information about financial instruments [line items]
Net gain loss on derivatives	(176,341)
Derivatives not designated as hedges [member] | Forwards [member]
Disclosure of detailed information about financial instruments [line items]
Net gain loss on derivatives			2,007,393
Derivatives not designated as hedges [member] | Futures [member]
Disclosure of detailed information about financial instruments [line items]
Net gain loss on derivatives	(1,612,650)	(1,460,990)	374,112
Derivatives not designated as hedges [member] | Crude oil options [member]
Disclosure of detailed information about financial instruments [line items]
Net gain loss on derivatives	4,996,014	(2,762,358)	2,329,051
Derivatives not designated as hedges [member] | Currency Options [member]
Disclosure of detailed information about financial instruments [line items]
Net gain loss on derivatives	2,698,749	(2,447,050)	(2,210,301)
Derivatives not designated as hedges [member] | Natural gas options [member]
Disclosure of detailed information about financial instruments [line items]
Net gain loss on derivatives		49	185
Derivatives not designated as hedges [member] | Cross - currency swaps [member]
Disclosure of detailed information about financial instruments [line items]
Net gain loss on derivatives	13,770,848	(16,019,238)	(21,902,567)
Derivatives not designated as hedges [member] | Natural gas swaps [member]
Disclosure of detailed information about financial instruments [line items]
Net gain loss on derivatives		2	117
Derivatives not designated as hedges [member] | Interest rate swaps [member]
Disclosure of detailed information about financial instruments [line items]
Net gain loss on derivatives	$ (777,965)	$ (574,338)	$ 286,059

Employee Benefits - Summary of

Employee Benefits - Summary of Amounts Associated With PEMEX's Labor Obligations (Detail) - MXN ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of defined benefit plans [line items]
Total liability for defined benefits recognized in the consolidated statement of financial position at the end of the year	$ 1,535,168,086	$ 1,456,815,367
Retirement And Post Employment Benefits [member]
Disclosure of defined benefit plans [line items]
Total liability for defined benefits recognized in the consolidated statement of financial position at the end of the year	1,516,671,029	1,438,849,732	$ 1,067,317,120
Other long-term benefits [member]
Disclosure of defined benefit plans [line items]
Total liability for defined benefits recognized in the consolidated statement of financial position at the end of the year	$ 18,497,057	$ 17,965,635	$ 13,224,926

Employee Benefits - Summary o_2

Employee Benefits - Summary of Information Regarding PEMEX's Retirement and Post-Employment Benefits (Detail) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Changes in the liability for defined benefits
Defined benefit obligations at the beginning of the year	$ 1,456,815,367
Plan assets at the beginning of year	2,585,007
Actuarial losses (gains) in other comprehensive results due to:
Change in financial assumptions	77,094,827	$ 304,527,285
Change in demographic assumptions	(18,581,935)	(9,012,031)
For experience during the year	(41,069,054)	25,228,095
Pension plan assets at the end of year	2,438,724	2,585,007
Defined benefit liabilities at end of year	1,535,168,086	1,456,815,367
Plan assets [member]
Changes in the liability for defined benefits
Defined benefit obligations at the beginning of the year	1,441,356,415	1,074,233,038
Plan assets at the beginning of year	2,585,007	7,200,471
Return on plan assets	262,273	833,638
Service Cost	20,793,204	14,516,102
Payments by the pension fund	(63,204,515)	(59,967,278)
Company contributions to the fund	62,928,670	54,395,709
Actuarial (gains) losses in plan assets	(32,531)	43,683
Actuarial losses (gains) in other comprehensive results due to:
Effect of the liability ceiling		157,774
Adjustment to the Defined Contribution Plan	(100,180)	(61,582)
Clearance Price		(17,408)
Pension plan assets at the end of year	2,438,724	2,585,007
Defined benefit liabilities at end of year	1,519,084,202	1,441,356,415
Retirement And Post Employment Benefits [member]
Changes in the liability for defined benefits
Defined benefit obligations at the beginning of the year	1,438,849,732	1,067,317,120
Service Cost	22,742,631	15,871,004
Net interest	105,699,575	95,643,572
Defined benefits paid by the fund	(5,168,608)	(5,759,721)
Actuarial losses (gains) in other comprehensive results due to:
Change in financial assumptions	77,094,827	304,527,285
Change in demographic assumptions	(18,581,935)	(9,012,031)
For experience during the year	(41,069,054)	25,228,095
Assets of the plan during the year	32,531	(43,628)
Effect of the liability ceiling		(127,137)
Real interest, excluding earned interests		(363,873)
Adjustment to the Defined Contribution Plan		61,583
Remeasurements		(96,828)
Contributions paid to the fund	(62,928,670)	(54,395,709)
Defined benefit liabilities at end of year	$ 1,516,671,029	$ 1,438,849,732

Employee Benefits - Additional

Employee Benefits - Additional Information (Detail) $ in Thousands	Jan. 01, 2021MXN ($)	Apr. 30, 2020MXN ($)	Dec. 31, 2020MXN ($)	Dec. 31, 2019MXN ($)	Dec. 31, 2018MXN ($)
Disclosure of defined benefit plans [line items]
Percentage of increase in the assumed variation rate			(12.25%)
Net actuarial gains recognized in other comprehensive income			$ (19,182,373)
Expected payments	$ 75,776,059
Percentage of decrease in assumed variation rate			15.42%
Long term expected benefit payments	$ 359,746
Assets (liabilities) recognized in the balance sheet (DC- warranty)			$ 3,051,044	$ 2,023,220
Expense in the income statement (net cost for the period, CD-guarantee)			356,880	316,915
Plan assets at fair value			$ 2,438,724	$ 2,585,007
Percentage decrease in salary increase rate			4.47	5.02
Plan assets [member]
Disclosure of defined benefit plans [line items]
Plan assets at fair value			$ 2,438,724	$ 2,585,007	$ 7,200,471
Plan assets [member] | Affiliated Companies [member]
Disclosure of defined benefit plans [line items]
Plan assets at fair value			2,429,342
Plan assets [member] | FOLAPE [member]
Disclosure of defined benefit plans [line items]
Plan assets at fair value			$ 9,382
Long term employee benefits [member]
Disclosure of defined benefit plans [line items]
Discount rate of long-term benefits.			23.25%	(17.30%)
Pensions and retirement plans [member] | PEMEX [Member]
Disclosure of defined benefit plans [line items]
Principal amount of promissory note		$ 4,983,670
Promissory note principle amount		4,102,622
Promissory note interest amount		$ 881,048
Medical services of increase or decrease of one percentage point [member]
Disclosure of defined benefit plans [line items]
Percentage of increase in the assumed variation rate			3.23%
Percentage of decrease in assumed variation rate			(2.47%)
Medical services of increase or decrease of one percentage point [member] | Long term employee benefits [member]
Disclosure of defined benefit plans [line items]
Percentage of increase in the assumed variation rate			8.53%
Percentage of decrease in assumed variation rate			(5.90%)
Actuarial assumption of inflation rates increase decrease of one percentage [member]
Disclosure of defined benefit plans [line items]
Percentage of increase in the assumed variation rate			9.58%
Percentage of decrease in assumed variation rate			(8.08%)
Actuarial assumption of inflation rates increase decrease of one percentage [member] | Long term employee benefits [member]
Disclosure of defined benefit plans [line items]
Percentage of increase in the assumed variation rate			0.40%
Percentage of decrease in assumed variation rate			(0.35%)
Actuarial assumption of wage rates increase decrease of one percentage [member]
Disclosure of defined benefit plans [line items]
Percentage of increase in the assumed variation rate			1.37%
Percentage of decrease in assumed variation rate			(1.20%)
Actuarial assumption of wage rates increase decrease of one percentage [member] | Long term employee benefits [member]
Disclosure of defined benefit plans [line items]
Percentage of increase in the assumed variation rate			4.51%
Percentage of decrease in assumed variation rate			(3.99%)
Actuarial assumption of discount rates [member]
Disclosure of defined benefit plans [line items]
Percentage of increase in the assumed variation rate			7.08%	7.53%

Employee Benefits - Summary o_3

Employee Benefits - Summary of Amounts and Types of Plan Assets (Detail) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of fair value of plan assets [line items]
Cash and cash equivalents	$ 10,845	$ 138,795
Debt instruments	2,427,879	2,446,212
Total plan assets	2,438,724	2,585,007
Change in the liability for defined benefits
Defined benefit obligations at the beginning of the year	1,456,815,367
Change in financial assumptions	77,094,827	304,527,285
Change in demographic assumptions	(18,581,935)	(9,012,031)
For experience during the year	(41,069,054)	25,228,095
Obligations settled		(14,237)
Reductions	34,789	(129,909)
Modifications to the pension plan	1,949,427	1,307,769
Defined benefit liabilities at end of year	1,535,168,086	1,456,815,367
Plan assets [member]
Disclosure of fair value of plan assets [line items]
Cash and cash equivalents	10,845	138,795
Debt instruments	2,427,879	2,446,212
Total plan assets	2,438,724	2,585,007	$ 7,200,471
Change in the liability for defined benefits
Defined benefit obligations at the beginning of the year	1,441,356,415	1,074,233,038
Service costs	20,793,204	14,516,102
Financing costs	105,802,122	96,350,258
Past service costs		77,045
Payments by the fund	(68,295,593)	(65,727,000)
Defined benefit liabilities at end of year	$ 1,519,084,202	$ 1,441,356,415

Employee Benefits - Summary o_4

Employee Benefits - Summary of Additional Fair value Disclosure About Plan Assets and Indicate Their Rank (Detail) - MXN ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Disclosure of fair value of plan assets [line items]
Cash and cash equivalents	$ 10,845	$ 138,795
Debt instruments	2,427,879	2,446,212
Total	2,438,724	2,585,007
Level 1 [member]
Disclosure of fair value of plan assets [line items]
Cash and cash equivalents	10,845	138,795
Debt instruments	2,427,879	2,446,212
Total	2,438,724	2,585,007
Level 2 [member]
Disclosure of fair value of plan assets [line items]
Cash and cash equivalents	0	0
Debt instruments	0	0
Total	0	0
Level 3 [member]
Disclosure of fair value of plan assets [line items]
Cash and cash equivalents	0	0
Debt instruments	0	0
Total	$ 0	$ 0

Employee Benefits - Summary o_5

Employee Benefits - Summary of Principal Actuarial Assumptions Used in Determining the Defined Benefit Obligation (Detail)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Percentage of principal actuarial assumptions used in determining the defined benefit obligation	(12.25%)
Average length of obligation (years)	17 years 6 months 7 days	17 years 6 months 7 days
Actuarial assumption of expected rates of salary increases [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Percentage of principal actuarial assumptions used in determining the defined benefit obligation	4.47%	5.02%
Actuarial assumption of expected rates of inflation [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Percentage of principal actuarial assumptions used in determining the defined benefit obligation	4.00%	4.00%
Actuarial assumption of basic basket for active personnel [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Percentage of principal actuarial assumptions used in determining the defined benefit obligation	5.00%	5.00%
Actuarial assumption of basic basket for retired personnel [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Percentage of principal actuarial assumptions used in determining the defined benefit obligation	4.00%	4.00%
Actuarial assumption of discount rates [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Percentage of principal actuarial assumptions used in determining the defined benefit obligation	7.08%	7.53%
Actuarial assumption of gas and gasoline rates [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Percentage of principal actuarial assumptions used in determining the defined benefit obligation	4.00%	4.00%
Actuarial assumption of expected rates of pension increases [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Percentage of principal actuarial assumptions used in determining the defined benefit obligation	4.00%	4.00%
Medical services [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Percentage of principal actuarial assumptions used in determining the defined benefit obligation	7.65%	7.65%
Actuarial assumption of life expectancy after retirement [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Percentage of principal actuarial assumptions used in determining the defined benefit obligation	0.00%	0.00%
Other long-term benefits [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Average length of obligation (years)	17 years 6 months 7 days	17 years 6 months 7 days
Other long-term benefits [member] | Actuarial assumption of expected rates of salary increases [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Percentage of principal actuarial assumptions used in determining the defined benefit obligation	4.47%	5.02%
Other long-term benefits [member] | Actuarial assumption of expected rates of inflation [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Percentage of principal actuarial assumptions used in determining the defined benefit obligation	4.00%	4.00%
Other long-term benefits [member] | Actuarial assumption of basic basket for active personnel [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Percentage of principal actuarial assumptions used in determining the defined benefit obligation	5.00%	5.00%
Other long-term benefits [member] | Actuarial assumption of basic basket for retired personnel [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Percentage of principal actuarial assumptions used in determining the defined benefit obligation	4.00%	4.00%
Other long-term benefits [member] | Actuarial assumption of discount rates [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Percentage of principal actuarial assumptions used in determining the defined benefit obligation	7.08%	7.53%
Other long-term benefits [member] | Actuarial assumption of gas and gasoline rates [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Percentage of principal actuarial assumptions used in determining the defined benefit obligation	4.00%	4.00%

Employee Benefits - Summary o_6

Employee Benefits - Summary of Amounts Recognized for Long-term Obligations (Detail) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Change in the liability for defined benefits
Defined benefit obligations at the beginning of the year	$ 1,456,815,367
Actuarial (gains) losses recognized in income due to:
Change in financial assumptions	77,094,827	$ 304,527,285
Change in demographic assumptions	18,581,935	9,012,031
Defined benefit liabilities at end of year	1,535,168,086	1,456,815,367
Other long-term benefits [member]
Change in the liability for defined benefits
Defined benefit obligations at the beginning of the year	17,965,635	13,224,926
Charge to income for the year	2,865,809	2,164,866
Actuarial (gains) losses recognized in income due to:
Change in financial assumptions	912,673	5,007,261
Change in demographic assumptions	(439,969)	(245,829)
For experience during the year	(2,806,112)	(2,418,954)
Real interest, excluding earned interests		264,917
Effect of the liability ceiling		(30,638)
Adjustmentto the Defined Contribution Plan		(914)
Benefits paid	(979)
Defined benefit liabilities at end of year	$ 18,497,057	$ 17,965,635

Provisions for Sundry Credito_3

Provisions for Sundry Creditors - Summary of Provisions for Sundry Creditors and Others (Detail) $ in Thousands, $ in Thousands	Dec. 31, 2020USD ($)	Dec. 31, 2020MXN ($)	Dec. 31, 2019MXN ($)	Dec. 31, 2018MXN ($)
Disclosure of other provisions [abstract]
Provision for plugging of wells (Note 13)		$ 77,125,513	$ 80,849,900	$ 84,050,900
Provision for trails in process (Note 27)		8,321,816	8,075,031	6,483,078
Provision for environmental costs		9,178,555	9,086,977	$ 11,219,278
Provisions	$ 4,743,461	$ 94,625,884	$ 98,011,908

Provisions for Sundry Credito_4

Provisions for Sundry Creditors - Summary of Allowance Account for Plugging of Wells, Trials in Progress and Environmental Costs (Detail) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disclosure of other provisions [abstract]
Balance at the beginning of the year	$ 80,849,900	$ 84,050,900
(Decrease) Increase capitalized in fixed assets	(12,816,336)	(2,826,003)
Unwinding of discount against income	4,555,692	3,318,384
Unrealized foreign exchange loss (gains)	4,766,921	(3,577,200)
Amount used	(230,664)	(116,181)
Balance at the end of the year	77,125,513	80,849,900
Balance at the beginning of the year	8,075,031	6,483,078
Additions against expenses	972,692	1,901,930
Provision cancellation	(724,026)	(309,977)
Amount used	(1,881)	0
Balance at the end of the year	8,321,816	8,075,031
Balance at the beginning of the year	9,086,977	11,219,278
Additions against expenses	1,669,063	4,745,835
Cancellation against expenses	(1,574,810)	(6,873,905)
Amount used	(2,675)	(4,231)
Balance at the end of the year	$ 9,178,555	$ 9,086,977

Provisions for Sundry Credito_5

Provisions for Sundry Creditors - Summary of provisions for plugging of wells (Detail) - MXN ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure Of Provision For Plugging Of Wells [Line Items]
Provisions For Plugging Of Wells	$ 77,125,513	$ 80,849,900	$ 84,050,900
2021 [member]
Disclosure Of Provision For Plugging Of Wells [Line Items]
Provisions For Plugging Of Wells	2,858,989
2022 [member]
Disclosure Of Provision For Plugging Of Wells [Line Items]
Provisions For Plugging Of Wells	2,197,972
2023 [member]
Disclosure Of Provision For Plugging Of Wells [Line Items]
Provisions For Plugging Of Wells	3,167,257
2024 [member]
Disclosure Of Provision For Plugging Of Wells [Line Items]
Provisions For Plugging Of Wells	3,456,396
2025 [member]
Disclosure Of Provision For Plugging Of Wells [Line Items]
Provisions For Plugging Of Wells	6,110,317
More than 5 years [member]
Disclosure Of Provision For Plugging Of Wells [Line Items]
Provisions For Plugging Of Wells	$ 59,334,582

Provisions for Sundry Credito_6

Provisions for Sundry Creditors - Additional Information (Detail) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disclosure of other provisions [line items]
Discount rate effect in provision against fixed assets	$ 4,555,692	$ 3,318,348
Bottom of range [member] | U.S [member]
Disclosure of other provisions [line items]
Discount rate yield	3.268%	3.279%
Bottom of range [member] | Peso
Disclosure of other provisions [line items]
Discount rate yield	9.517%	9.178%
Top of range [member] | U.S [member]
Disclosure of other provisions [line items]
Discount rate yield	7.799%	6.96%
Top of range [member] | Peso
Disclosure of other provisions [line items]
Discount rate yield	15.051%	11.834%

Income Taxes and Duties - Addit

Income Taxes and Duties - Additional Information (Detail) $ in Thousands	Jan. 01, 2021	Apr. 21, 2020MXN ($)	Jan. 01, 2020	Jan. 01, 2019	Dec. 31, 2020MXN ($)$ / l	Dec. 31, 2019MXN ($)	Dec. 31, 2018MXN ($)	Dec. 31, 2020USD ($)km²	Dec. 31, 2020MXN ($)km²
Disclosure of Income Taxes and Duties [Line items]
Percentage DUC tax rate					58.00%	65.00%
Tax benefit from exploration and extraction activities						$ 8,677,891,000	$ 11,110,177,000
Payments made for extraction duty					$ 37,673,573,000
Payments made for exploration duty					$ 1,068,598,000
Percentage of general VAT tax rate					16.00%
Percentage VAT tax rate for certain activities with incentives					0.00%
Percentage income tax rate					30.00%
Percent Of General VAT Credit						50.00%
Deferred tax accumulated effect of actuarial gains and losses						$ 136,166,747,000		$ 5,440,415	$ 108,529,199,000
Deferred tax effect of actuarial gains and losses					$ (1,100,733,000)	10,613,057,000
Payments of income tax					4,288,716,000
Duties and income tax paid					172,369,522,000	347,515,447,000	443,785,240,000
Deferred Tax Assets [member]
Disclosure of Income Taxes and Duties [Line items]
Tax income					$ 743,263,723,000	647,629,937,000
2020 Revenue Law [member] | Top of range [member]
Disclosure of Income Taxes and Duties [Line items]
Decrease in tax rate					65.00%
2020 Revenue Law [member] | Bottom of range [member]
Disclosure of Income Taxes and Duties [Line items]
Decrease in tax rate					58.00%
Presidential Decree [member]
Disclosure of Income Taxes and Duties [Line items]
Reduction of tax burden		$ 65,000,000
DUC [member]
Disclosure of Income Taxes and Duties [Line items]
Profit sharing duty					$ (218,912,687,000)	(343,242,476,000)	$ (443,294,170,000)
Tax benefit from exploration and extraction activities						17,110,177,000
Profit sharing duty fiscal credit					(65,000,000,000)
Accumulated effect of actuarial gains and losses [member]
Disclosure of Income Taxes and Duties [Line items]
Deferred tax accumulated effect of actuarial gains and losses						19,347,685,000			$ 18,246,952,000
Tax regime applicable to assignments [member]
Disclosure of Income Taxes and Duties [Line items]
Tax payable for non-producing areas | km²								1,396.09	1,396.09
Tax payable for non-producing areas over 60 months | km²								3,338.46	3,338.46
Tax payable for exploration phase | km²								1,820.97	1,820.97
Tax payable for extraction phase | km²								7,283.92	7,283.92
Payments of income tax					$ 204,293,000
Tax regime applicable to contracts [member]
Disclosure of Income Taxes and Duties [Line items]
Tax payable for non-producing areas | km²								1,396.09	1,396.09
Tax payable for non-producing areas over 60 months | km²								3,338.47	3,338.47
Tax payable for exploration phase | km²								1,820.97	1,820.97
Tax payable for extraction phase | km²								7,283.92	7,283.92
IEPS Tax on the Sale of Automotive Fuels [member] | Magna Gasoline [member]
Disclosure of Income Taxes and Duties [Line items]
Special tax on production and services (IEPS Tax) | $ / l					4.95
IEPS Tax on the Sale of Automotive Fuels [member] | Premium Gasoline [member]
Disclosure of Income Taxes and Duties [Line items]
Special tax on production and services (IEPS Tax) | $ / l					4.18
IEPS Tax on the Sale of Automotive Fuels [member] | Diesel [member]
Disclosure of Income Taxes and Duties [Line items]
Special tax on production and services (IEPS Tax) | $ / l					5.44
IEPS Tax in Favor of States, Municipalities and Territories [member] | Diesel [member]
Disclosure of Income Taxes and Duties [Line items]
Special tax on production and services (IEPS Tax) | $ / l					36.26
IEPS Tax in Favor of States, Municipalities and Territories [member] | Less Than 91 Octanes Gasoline [Member]
Disclosure of Income Taxes and Duties [Line items]
Special tax on production and services (IEPS Tax) | $ / l					43.69
IEPS Tax in Favor of States, Municipalities and Territories [member] | More Than 91 Octanes Gasoline [Member]
Disclosure of Income Taxes and Duties [Line items]
Special tax on production and services (IEPS Tax) | $ / l					53.31
IEPS Tax on Fossil Fuels [member] | Diesel [member]
Disclosure of Income Taxes and Duties [Line items]
Special tax on production and services (IEPS Tax) | $ / l					15.92
IEPS Tax on Fossil Fuels [member] | Propane [member]
Disclosure of Income Taxes and Duties [Line items]
Special tax on production and services (IEPS Tax) | $ / l					7.48
IEPS Tax on Fossil Fuels [member] | Butane [member]
Disclosure of Income Taxes and Duties [Line items]
Special tax on production and services (IEPS Tax) | $ / l					9.68
IEPS Tax on Fossil Fuels [member] | Fuel Oil [member]
Disclosure of Income Taxes and Duties [Line items]
Special tax on production and services (IEPS Tax) | $ / l					16.99
IEPS Tax on Fossil Fuels [member] | Petroleum Coke [member]
Disclosure of Income Taxes and Duties [Line items]
Special tax on production and services (IEPS Tax) | $ / l					19.72
IEPS Tax on Fossil Fuels [member] | Jet Fuel And Other Kerosene [member]
Disclosure of Income Taxes and Duties [Line items]
Special tax on production and services (IEPS Tax) | $ / l					15.67
IEPS Tax on Fossil Fuels [member] | Gasoline And Aviation Gasoline [member]
Disclosure of Income Taxes and Duties [Line items]
Special tax on production and services (IEPS Tax) | $ / l					13.12
IEPS Tax on Fossil Fuels [member] | Coal Coke [Member]
Disclosure of Income Taxes and Duties [Line items]
Special tax on production and services (IEPS Tax) | $ / l					46.23
IEPS Tax on Fossil Fuels [member] | Mineral Carbon [Member]
Disclosure of Income Taxes and Duties [Line items]
Special tax on production and services (IEPS Tax) | $ / l					34.81
IEPS Tax on Fossil Fuels [member] | Carbon From Other Fossil Fuels [Member]
Disclosure of Income Taxes and Duties [Line items]
Special tax on production and services (IEPS Tax) | $ / l					50.32
Exploration [member]
Disclosure of Income Taxes and Duties [Line items]
Profit sharing duty					$ 218,912,687,000	343,242,476,000
Profit sharing duty monthly installment					153,292,899,000	347,515,447,000
Favorable balance of Profit sharing duty					149,715,000	$ 4,272,971,000
Profit sharing duty fiscal credit					65,000,000,000
Profit sharing duty balance amount					$ 470,073,000
Exploration [member] | Changes in tax rates or tax laws enacted or announced [member]
Disclosure of Income Taxes and Duties [Line items]
Applicable tax rate of profit-sharing duty			58.00%	65.00%
Percentage DUC tax rate	54.00%

Income Taxes and Duties - Summa

Income Taxes and Duties - Summary of Total DUC and Others (Detail) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure Of Duties And Others [line items]
DUC from prior years	$ 0	$ 39	$ (14,883)
Other	0		(446,464)
DUC [member]
Disclosure Of Duties And Others [line items]
DUC	218,912,687	343,242,476	443,294,170
Fiscal credit	(65,000,000)
DUC from prior years		(39)	14,883
Other			446,464
Deferred DUC expense (benefit)	696,449	29,570,063	26,178,078
Total DUC and other	$ 154,609,136	$ 372,812,500	$ 469,933,595

Income Taxes and Duties - Sum_2

Income Taxes and Duties - Summary of Principal Factors Generating the Deferred DUC (Detail) - DUC [member] - MXN ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Deferred DUC asset
Tax credits	$ 572,796,156	$ 546,317,620
Deferred Profit-sharing duty liability
Wells, pipelines, properties, plant and equipment	(208,999,954)	(151,479,977)
Deferred DUC asset net	363,796,202	394,837,643
Unrecognized Deferred DUC	(355,374,599)	(385,719,589)
Net long-term deferred income tax asset	$ 8,421,603	$ 9,118,054

Income Taxes and Duties - Sum_3

Income Taxes and Duties - Summary of Expected Benefit for DUC (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)	Dec. 31, 2020MXN ($)	Dec. 31, 2019MXN ($)	Dec. 31, 2018MXN ($)
Disclosure Of Expected Benefit For DUC [abstract]
Expected (benefit) expense		$ (20,837,768)	$ 43,432,712	$ 307,269,035
Increase (decrease) resulting from:
Expected benefit contract		(496,643)	(4,948,542)	(5,797,144)
Duties from prior year		0	(26)	9,860
Non-cumulative profit		(2,291,937,519)	(1,130,442,995)	(593,158,584)
Non-deductible expenses		2,313,271,930	1,091,958,851	291,676,831
Production value		321,353,133	495,394,906	610,206,103
Deductible duties		(21,850,672)	(39,891,325)	(55,005,397)
DUC tax credit		(65,000,000)
Deferred DUC expense		696,449	29,570,063	26,178,078
Deductions cap		(80,589,774)	(112,261,105)	(111,906,534)
DUC from prior years		0	(39)	14,883
Other		0		446,464
Profit sharing duty, net	$ 7,750,336	$ 154,609,136	$ 372,812,500	$ 469,933,595

Income Taxes and Duties - Sum_4

Income Taxes and Duties - Summary of Income Tax Expense (Benefit) (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)	Dec. 31, 2020MXN ($)	Dec. 31, 2019MXN ($)	Dec. 31, 2018MXN ($)
Disclosure of Income Taxes and Duties [Line items]
Total duties, taxes and other	$ 9,302,464	$ 185,572,075	$ 343,823,489	$ 461,578,223
PEMEX [member]
Disclosure of Income Taxes and Duties [Line items]
Current income tax		5,370,822	4,247,998	3,109,971
Deferred income tax		25,592,117	(33,237,009)	(11,465,343)
Total duties, taxes and other		$ 30,962,939	$ (28,989,011)	$ (8,355,372)

Income Taxes and Duties - Sum_5

Income Taxes and Duties - Summary of Principal Factors Generating Deferred Income Tax (Detail) $ in Thousands, $ in Thousands	Dec. 31, 2020USD ($)	Dec. 31, 2020MXN ($)	Dec. 31, 2019MXN ($)	Dec. 31, 2018MXN ($)
Deferred income tax liability:
Total deferred income tax liability	$ (171,044)	$ (3,412,114)	$ (3,676,735)
PEMEX [member]
Deferred income tax asset:
Provisions		8,919,555	8,880,184	$ 8,836,693
Employee benefits provision		71,640,981	68,290,356	40,314,749
Advance payments from clients		188,283	305,000	35,807
Accrued liabilities		1,681,362	2,101,011	611,652
Reserve due to depreciation of inventories		0	189,751	982,228
Non-recoverable accounts receivable		102,435	709,328	763,924
Derivative financial instruments		41,735	136,260	29,674
Wells, pipelines, properties and equipment		5,151,623	8,071,570	11,862,776
Tax loss carry-forwards		12,427,658	38,427,643	20,659,110
Total deferred income tax asset		100,153,632	127,111,103	84,096,613
Deferred income tax liability:
Wells, pipelines, properties, plant and equipment		(1,101,832)	(1,614,704)	(2,630,597)
Other		(2,310,282)	(2,062,031)	(1,881,715)
Total deferred income tax liability		(3,412,114)	(3,676,735)	(4,512,312)
Net long-term deferred income tax asset		96,741,518	123,434,368	$ 79,584,301
PEMEX [member] | Recognized in profit and loss [member]
Deferred income tax asset:
Provisions		39,371	43,491
Employee benefits provision		4,451,358	17,362,550
Advance payments from clients		(116,717)	269,193
Accrued liabilities		(419,649)	1,489,359
Reserve due to depreciation of inventories		(189,751)	(792,477)
Non-recoverable accounts receivable		(606,893)	(54,596)
Derivative financial instruments		(94,525)	106,586
Wells, pipelines, properties and equipment		(2,919,947)	(3,791,206)
Tax loss carry-forwards		(25,999,985)	17,768,533
Total deferred income tax asset		(25,856,738)	32,401,433
Deferred income tax liability:
Wells, pipelines, properties, plant and equipment		512,872	1,015,893
Other		(248,251)	(180,316)
Total deferred income tax liability		264,621	835,577
Net long-term deferred income tax asset		(25,592,117)	33,237,010
PEMEX [member] | Recognized in OCI and equity [member]
Deferred income tax asset:
Provisions		0
Employee benefits provision		(1,100,733)	10,613,057
Advance payments from clients		0
Accrued liabilities		0
Reserve due to depreciation of inventories		0
Non-recoverable accounts receivable		0
Derivative financial instruments		0
Wells, pipelines, properties and equipment		0
Tax loss carry-forwards		0
Total deferred income tax asset		(1,100,733)	10,613,057
Deferred income tax liability:
Wells, pipelines, properties, plant and equipment		0
Other		0
Total deferred income tax liability		0
Net long-term deferred income tax asset		$ (1,100,733)	$ 10,613,057

Income Taxes and Duties - Sum_6

Income Taxes and Duties - Summary of Expense (Benefit) Attributable to Profit (Loss) from Continuing Operations before Income Taxes (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)	Dec. 31, 2020MXN ($)	Dec. 31, 2019MXN ($)	Dec. 31, 2018MXN ($)
Disclosure of Income Taxes and Duties [Line items]
Total duties, taxes and other	$ 9,302,464	$ 185,572,075	$ 343,823,489	$ 461,578,223
PEMEX [member]
Disclosure of Income Taxes and Duties [Line items]
Expected income tax expense		28,835,256	3,707,023	(41,316,168)
Tax effect of inflation-net		5,694,637	6,487,844	11,742,346
Fiscal updating of pipelines, properties and equipment		(161,883)	(5,290,734)	(3,359,548)
Unrecognized Deferred tax asset				21,885,731
Cancellation of tax credits			(24,189,922)
Retirement benefits		(8,206,693)	(10,698,848)
Non-deductible expenses		2,405,635	4,826,745	1,781,012
Others-net		2,395,987	(3,831,120)	911,255
Total duties, taxes and other		$ 30,962,939	$ (28,989,011)	$ (8,355,372)

Equity (Deficit) - Additional I

Equity (Deficit) - Additional Information (Detail)	Apr. 30, 2020MXN ($)	Dec. 24, 2015MXN ($)	May 31, 2020MXN ($)	May 31, 2020EUR (€)	Aug. 15, 2016MXN ($)	Apr. 30, 2020MXN ($)	Dec. 31, 2021USD ($)	Dec. 31, 2020USD ($)	Dec. 31, 2020MXN ($)	Dec. 31, 2019MXN ($)	Dec. 31, 2018MXN ($)	Dec. 31, 2021MXN ($)	May 07, 2021MXN ($)	May 01, 2021EUR (€)	Dec. 31, 2020MXN ($)	Mar. 31, 2020MXN ($)	Nov. 25, 2019USD ($)	Nov. 25, 2019MXN ($)	Dec. 28, 2018USD ($)	Dec. 28, 2018MXN ($)	Dec. 31, 2017MXN ($)	Aug. 05, 2016MXN ($)	Jun. 29, 2016MXN ($)
Disclosure of equity [line items]
Recognized net losses										$ 282,112,024,000	$ 180,419,837,000				$ 509,052,065,000
Negative equity amount										1,931,409,302,000					2,404,727,030,000
Negative working capital									$ 442,550,332,000	209,168,587,000
Gain (loss) on non-controlling interest									(369,692,000)	(141,793,000)
Net actuarial losses in other comprehensive income (loss) net of deferred income tax									$ (19,178,587,000)	$ (309,334,500,000)
Total available Credit lines															190,604,990,000
Short- term debt principal maturities															$ 391,097,267,000
Percentage of discount and return on plan asset								7.08%		7.53%					7.08%
Borrowings										$ 2,035,079,540,000					$ 2,232,694,117,000		$ 1,851,000,000	$ 34,875,000,000	$ 5,640,000,000	$ 112,000,000,000
Revenue law oil revenue per barrel usage description								In accordance with the Revenue Law for 2021, crude oil revenues between 42.12 and upto 44.12 U.S. dollars per barrel will be directed to improve PEMEX´s financial balance goal for 2021 and revenues above 44.12 U.S. dollars per barrel may be used for operating expenses and capital expenditures.	In accordance with the Revenue Law for 2021, crude oil revenues between 42.12 and upto 44.12 U.S. dollars per barrel will be directed to improve PEMEX´s financial balance goal for 2021 and revenues above 44.12 U.S. dollars per barrel may be used for operating expenses and capital expenditures.
Proportion of ownership interest held								100.00%	100.00%
Total assets								$ 96,672,361,000		1,984,247,080,000					1,928,487,928,000
Total liabilities								217,217,913,000		3,915,656,382,000					4,333,214,958,000
Negative capital								(120,545,552,000)		(1,931,409,302,000)	(1,459,405,432,000)				(2,404,727,030,000)						$ (1,502,377,342,000)
Net (loss) income								$ (25,518,054,000)	$ (509,052,065,000)	(282,112,024,000)	$ (180,419,837,000)
Percentage of share profit duty								58.00%	58.00%
Available credit lines								$ 7,700,000							37,000,000
Forecast [Member]
Disclosure of equity [line items]
Total Approved financing for 2021												$ 42,100,000,000
Approved financing for 2021							$ 1,000,000,000					22,000,000,000
Disposal Of Non Controlling Interest In HJ Barreras [member]
Disclosure of equity [line items]
Proportion of ownership interest held			51.00%	51.00%
Total consideration			$ 134,716,000	€ 5,100,000
Total assets	$ 1,558,000,000					$ 1,558,000,000								€ 8,400
Total liabilities	2,945,300,000					$ 2,945,300,000
Percentage of ownership interest						49.00%
Negative capital	1,387,300,000					$ 1,387,300,000
Net (loss) income	$ 224,500,000
Gain on disposal of investments									$ 833,038,000
Lines Of Credit [member]
Disclosure of equity [line items]
Total available Credit lines								1,900,000,000							37,000,000,000
Aggregate available credit lines								1,900,000,000		37,000,000,000					74,902,530,000
Borrowings								$ 3,600,000,000							71,815,320,000
Tax Credit Realted to Share Profit Duty [member]
Disclosure of equity [line items]
Tax credit related to share-profit duty applied																$ 18,320,000,000
Federal budget [member]
Disclosure of equity [line items]
Negative budget financial balance									92,687,000,000
Tax Benefit from Mexican Governmet [member]
Disclosure of equity [line items]
Tax credit applicable to share-profit duty															$ 73,280,000,000
Scheduled Equity Contributions [Member]
Disclosure of equity [line items]
Mexican government contributions												$ 96,720,000,000	$ 64,124,000,000
Changes in tax rates or tax laws enacted or announced [member]
Disclosure of equity [line items]
Percentage of share profit duty							54.00%
Contributions A [member]
Disclosure of equity [line items]
Issue of a non-negotiable promissory note																						$ 50,000,000,000
Promissory note issued																						$ 184,230,586,000	$ 184,230,586,000
Increase amount in equity		$ 135,439,612,000
Increase in the discount value of the promissory notes					$ 1,209,026,000
Increase in Certificates of Contribution									$ 46,256,000,000	$ 122,131,000,000

Equity (Deficit) - Summary of C

Equity (Deficit) - Summary of Certificate of Contribution "A" (Detail) - Contributions A [member] - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disclosure of equity [line items]
Certificates of Contribution, Beginning Balance	$ 478,675,447	$ 356,544,447
Increase in Certificates of Contribution during period	46,256,000	122,131,000
Certificates of Contribution, Ending Balance	$ 524,931,447	$ 478,675,447

Cost and Expenses by Nature - S

Cost and Expenses by Nature - Summary of Cost and Expenses by Nature (Detail) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of cost and expenses by nature [abstract]
Purchases	$ 386,040,047	$ 600,657,759	$ 756,867,203
Depreciation of wells, pipelines, properties, plant and equipment, depreciation of rights of use and amortization of intangible assets	137,398,830	145,159,657	153,382,040
Net periodic cost of employee benefits	128,808,540	116,176,949	114,621,614
Personnel services	103,044,657	101,252,318	104,284,007
Conservation and maintenance	69,939,632	65,640,388	48,562,536
Exploration and Extraction Hydrocarbons Duty and taxes	43,593,642	67,106,181	88,145,519
Other operation costs and expenses	25,031,177	12,711,674	16,672,534
Unsuccessful wells	22,269,583	79,595,185	15,443,086
Raw materials and spare parts	18,381,313	22,729,422	16,850,075
Auxiliary services with third-parties	15,901,982	19,492,638	23,675,019
Other operation taxes and duties	12,180,579	12,764,473	12,248,474
Exploration expenses	6,732,689	10,942,558	13,048,078
Insurance	6,068,497	5,821,020	5,647,101
Integrated Contracts	5,275,946	9,947,983	8,015,606
Losses from fuels subtraction	4,279,542	4,644,846	39,439,107
Freight	3,426,079	3,197,421	3,525,843
Inventory variations	2,572,641	1,063,678	(62,237,591)
Total cost of sales and general expenses	$ 990,945,376	$ 1,275,588,157	$ 1,358,190,251

Other Revenues and Other Expe_3

Other Revenues and Other Expenses - Summary of Other Revenues and Expenses, net (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)	Dec. 31, 2020MXN ($)	Dec. 31, 2019MXN ($)	Dec. 31, 2018MXN ($)
Other Revenue And Expense Net [Line Items]
Total other revenues	$ 589,956	$ 11,768,846	$ 14,940,447	$ 41,517,631
Total other expenses	$ (59,889)	(1,194,714)	(7,211,691)	(18,465,120)
Other Revenues [Member]
Other Revenue And Expense Net [Line Items]
Participation rights		30,878		14,165,042
Other		3,551,636	3,418,551	7,525,714
Revenues from reinsurance premiums		2,534,466	4,869,266	3,615,907
Other income for services		2,420,939	1,994,572	3,786,253
Claims recovery		1,515,295	2,687,258	3,979,698
Sale of fixed assets by bidding				3,301,653
Gain on sale of fixed assets		50,215	77,633	1,850,052
Price of sale share				1,262,987
Franchise fees		494,785	389,730	1,125,339
Bidding terms, sanctions, penalties and other		1,170,632	1,503,437	630,365
Cash distributions				274,621
Total other revenues		11,768,846	14,940,447	41,517,631
Other Expenses [Member]
Other Revenue And Expense Net [Line Items]
Other		(436,723)	(4,602,210)	(5,348,666)
Claims		(376,697)	(173,414)	(474,299)
Disposal of assets		(351,010)	(2,413,776)	(12,600,191)
Transportation and distribution of natural gas		(30,284)	(22,291)	(41,964)
Total other expenses		$ (1,194,714)	$ (7,211,691)	$ (18,465,120)

Related Parties - Summary of Pr

Related Parties - Summary of Products Acquisition from Pemex Industrial Transformation (Detail) - Pemex industrial transformation [member] $ in Thousands	Dec. 31, 2020MXN ($)
Disclosure of transactions between related parties [line items]
Product	$ 11,263,922
Heavy fuel oil [member]
Disclosure of transactions between related parties [line items]
Product	6,258,996
Industrial diesel [member]
Disclosure of transactions between related parties [line items]
Product	3,426,200
Fuel oil [member]
Disclosure of transactions between related parties [line items]
Product	456,960
Transport of Natural Gas [member]
Disclosure of transactions between related parties [line items]
Product	364,512
Other [member]
Disclosure of transactions between related parties [line items]
Product	303,278
Natural Gas [member]
Disclosure of transactions between related parties [line items]
Product	263,993
Freights [member]
Disclosure of transactions between related parties [line items]
Product	$ 189,983

Related Parties - Summary of Re

Related Parties - Summary of Retirement and Former Employee Benefits Granted (Detail) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Key Management Personnal Compensation [Line Items]
Retirement	$ 7,233	$ 15,549	$ 12,403
Post-employment	354	349	782
Long-term	3,702	2,698	3,312
Total	$ 11,289	$ 18,596	$ 16,497

Related Parties - Additional In

Related Parties - Additional Information (Detail) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Apr. 30, 2021
Disclosure of transactions between related parties [line items]
Aggregate compensation of executive officers	$ 30,988	$ 30,988	$ 51,188
Accrued or paid key management personnel compensation	$ 6,008	$ 5,985	$ 8,878
Salary advance terms	an amount up to a maximum of four months’ salary and are repaid through salary deductions in equal installments over a period of either one or two years
Salary advances outstanding	$ 893			$ 689
Explanation of terms and conditions of outstanding balances for related party transaction	Invoices are payable between 30 and 60 days
Pemex industrial transformation [member]
Disclosure of transactions between related parties [line items]
Ownership amount	$ 1,509,057

Commitments - Additional inform

Commitments - Additional information (Detail) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Commitments and contingencies [abstract]
Nitrogen to be supplied	$ 32,260,379	$ 35,718,401

Commitments - Estimated Future

Commitments - Estimated Future Payments Under Contracts (Detail) - Nitrogen supply contract [member] $ in Thousands	12 Months Ended
	Dec. 31, 2020MXN ($)
Commitments and contingencies [line items]
2021	$ 4,774,522
2022	4,863,254
2023	5,008,700
2024	5,042,333
2025	5,039,959
2026 and thereafter	7,531,611
Total	$ 32,260,379

Commitments - Estimated Value o

Commitments - Estimated Value of Contracts (Detail) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Financing performance of works [member]
Commitments and contingencies [line items]
Estimated value of contracts	$ 2,762,392	$ 3,288,581
Financing performance of works [member] | Up to 1 Year [member]
Commitments and contingencies [line items]
Estimated value of contracts	1,046,436	1,251,543
Financing performance of works [member] | 1 to 3 years [member]
Commitments and contingencies [line items]
Estimated value of contracts	1,339,040	1,610,152
Financing performance of works [member] | 4 to 5 years [member]
Commitments and contingencies [line items]
Estimated value of contracts	376,916	426,886
Infrastructure and service works [member]
Commitments and contingencies [line items]
Estimated value of contracts	374,157,407	621,731,744
Infrastructure and service works [member] | Up to 1 Year [member]
Commitments and contingencies [line items]
Estimated value of contracts	39,162,033	104,584,602
Infrastructure and service works [member] | 1 to 3 years [member]
Commitments and contingencies [line items]
Estimated value of contracts	274,421,535	325,674,623
Infrastructure and service works [member] | 4 to 5 years [member]
Commitments and contingencies [line items]
Estimated value of contracts	23,055,268	43,984,437
Infrastructure and service works [member] | More than 5 years [member]
Commitments and contingencies [line items]
Estimated value of contracts	$ 37,518,571	$ 147,488,082

Contingencies - Additional Info

Contingencies - Additional Information (Detail)

Oct. 18, 2019USD ($)

Feb. 06, 2019USD ($)

Feb. 06, 2019MXN ($)

Sep. 14, 2018USD ($)

Aug. 01, 2017MXN ($)

Mar. 22, 2017

Apr. 04, 2011USD ($)

Dec. 31, 2020USD ($)

Dec. 31, 2020MXN ($)

Dec. 31, 2019MXN ($)

Dec. 31, 2017USD ($)

Dec. 31, 2021USD ($)

May 11, 2021Exchange_Rate

Disclosure of contingent liabilities [line items]

Accrued reserve on contingent liabilities

$ 8,321,816,000

$ 8,075,031,000

Legal proceedings damage sought by plaintiffs

$ 310,484,000

$ 800,000,000

$ 193,713,000

$ 153,000,000

Legal proceedings damage sought by plaintiffs

12.82

Closing exchange rate

19.9487

19.9223

Termination Resolution January 14 2019 [Member]

Disclosure of contingent liabilities [line items]

Accrued reserve on contingent liabilities

$ 51,454,000

Pemex exploration and production [member]

Disclosure of contingent liabilities [line items]

Payments for legal proceedings claims for damage sought value

$ 34,576,000

$ 70,668,000

Contingent liability for guarantees [member] | Pemex industrial transformation [member]

Disclosure of contingent liabilities [line items]

Provision of guarantees or collateral to entity, related party transactions

150,000

2,992,305

Contingent liability for guarantees [member] | Exploration [member] | Deep water license modality trion field [member]

Disclosure of contingent liabilities [line items]

Exploration and evaluation costs

4,000,000

Contingent liability for guarantees [member] | Exploration [member] | Cinturon plegado perdido [member]

Disclosure of contingent liabilities [line items]

Exploration and evaluation costs

3,333,000

Contingent liability for guarantees [member] | Exploration [member] | Ek Balam fields [member]

Disclosure of contingent liabilities [line items]

Exploration and evaluation costs

5,000,000

Contingent liability for guarantees [member] | Exploration [member] | Tampico Misantla [member]

Disclosure of contingent liabilities [line items]

Exploration and evaluation costs

1,250,000

Contingent liability for guarantees [member] | Exploration [member] | Cuencas del Sureste [member]

Disclosure of contingent liabilities [line items]

Exploration and evaluation costs

1,250,000

Contingent liability for guarantees [member] | Exploration [member] | Assignment AE zero three nine eight Mission [member]

Disclosure of contingent liabilities [line items]

Exploration and evaluation costs

255,000

Contingent liability for guarantees [member] | Exploration [member] | Ogarrio field [member]

Disclosure of contingent liabilities [line items]

Exploration and evaluation costs

250,000

Contingent liability for guarantees [member] | Exploration [member] | Cardenas and Mora fields [member]

Disclosure of contingent liabilities [line items]

Exploration and evaluation costs

250,000

Contingent liability for guarantees [member] | Exploration [member] | Deep water license modality, contractual area two perdido [member]

Disclosure of contingent liabilities [line items]

Exploration and evaluation costs

2,500,000

Contingent liability for guarantees [member] | Exploration [member] | Deep water license modality, contractual area eighteen perdido [member]

Disclosure of contingent liabilities [line items]

Exploration and evaluation costs

5,000,000

Contingent liability for guarantees [member] | Exploration [member] | Cuenca Salina [member]

Disclosure of contingent liabilities [line items]

Exploration and evaluation costs

1,375,000

Contingent liability for guarantees [member] | Exploration [member] | Contractual sixteen of Tampico Misantla [member]

Disclosure of contingent liabilities [line items]

Exploration and evaluation costs

1,000,000

Contingent liability for guarantees [member] | Exploration [member] | Contractual area twenty nine Cuencas del Sureste [member]

Disclosure of contingent liabilities [line items]

Exploration and evaluation costs

2,500,000

Contingent liability for guarantees [member] | Exploration [member] | Contractual area thirty two Cuencas del Sureste [member]

Disclosure of contingent liabilities [line items]

Exploration and evaluation costs

1,250,000

Contingent liability for guarantees [member] | Exploration [member] | Ebano [member]

Disclosure of contingent liabilities [line items]

Exploration and evaluation costs

225,000

Contingent liability for guarantees [member] | Exploration [member] | Contractual area AE-0388-M-Miquetla [member]

Disclosure of contingent liabilities [line items]

Exploration and evaluation costs

245,000

Contingent liability for guarantees [member] | Exploration [member] | Deep water license modality, contractual area five perdido [member]

Disclosure of contingent liabilities [line items]

Exploration and evaluation costs

5,000,000

Contingent liability for guarantees [member] | Exploration [member] | Contractual seventeen of Tampico Misantla [member]

Disclosure of contingent liabilities [line items]

Exploration and evaluation costs

1,000,000

Contingent liability for guarantees [member] | Exploration [member] | Contractual Eighteen of Tampico Misantla [member]

Disclosure of contingent liabilities [line items]

Exploration and evaluation costs

2,000,000

Contingent liability for guarantees [member] | Exploration [member] | Contractual area thirty three Cuencas del Sureste [member]

Disclosure of contingent liabilities [line items]

Exploration and evaluation costs

1,250,000

Contingent liability for guarantees [member] | Exploration [member] | Contractual area thirty five Cuencas del Sureste [member]

Disclosure of contingent liabilities [line items]

Exploration and evaluation costs

1,250,000

Contingent liability for guarantees [member] | Exploration [member] | Contractual area Satuario and El Golpe 3 field [member]

Disclosure of contingent liabilities [line items]

Exploration and evaluation costs

$ 320,000

Provision of guarantees or collateral to entity, related party transactions

40,503,000

807,982,196

Contingent Liability for Work Performed [member]

Disclosure of contingent liabilities [line items]

Legal proceedings damage sought by plaintiffs

$ 240,448,000

$ 284,000

Contingent Liability for Public Works Contract [member]

Disclosure of contingent liabilities [line items]

Legal proceedings damage sought by plaintiffs

$ 137,300

Administrative Claim [member]

Disclosure of contingent liabilities [line items]

Legal proceedings damage sought by plaintiffs

$ 2,009,598,000

Administrative Claim [member] | Pemex industrial transformation [member]

Disclosure of contingent liabilities [line items]

Legal proceedings damage sought by plaintiffs

$ 113,582,000

$ 14,607,000

Subsequent Events - Additional

Subsequent Events - Additional Information (Detail) $ in Thousands	May 11, 2021USD ($)Exchange_Rate$ / bbl	May 11, 2021MXN ($)$ / bbl	Apr. 22, 2021MXN ($)	Apr. 13, 2021MXN ($)	Mar. 23, 2021MXN ($)	Feb. 19, 2021MXN ($)	Jan. 22, 2021USD ($)	Dec. 02, 2020	May 11, 2021USD ($)Exchange_Rate	Apr. 30, 2021MXN ($)	Dec. 31, 2020USD ($)$ / bbl	Dec. 31, 2020MXN ($)$ / bbl	May 11, 2021MXN ($)Exchange_Rate	May 01, 2021USD ($)	Jan. 22, 2021MXN ($)	Jan. 01, 2021MXN ($)	Dec. 31, 2020MXN ($)	Dec. 31, 2019MXN ($)	Nov. 25, 2019USD ($)	Nov. 25, 2019MXN ($)	Dec. 28, 2018USD ($)	Dec. 28, 2018MXN ($)
Disclosure of non-adjusting events after reporting period [line items]
Exchange rates	19.9223								19.9223		19.9487		19.9223				19.9487
Appreciation of the value of the peso in U.S. dollars terms	0.13%	0.13%
Principal amount of credit line																	$ 2,215,049,262,000	$ 1,947,986,835,000
Borrowings																	$ 2,232,694,117,000	$ 2,035,079,540,000	$ 1,851,000	$ 34,875,000,000	$ 5,640,000	$ 112,000,000,000
Litigation settlement claim												$ 2,863,050,000
LIBOR [member]
Disclosure of non-adjusting events after reporting period [line items]
Interest rate							1.38%								1.38%
U.S [member]
Disclosure of non-adjusting events after reporting period [line items]
Exchange rates											19.9487						19.9487	18.8452
Foreign currency exchange rate loss		$ 2,602,088
Subsequent event [member]
Disclosure of non-adjusting events after reporting period [line items]
Principal amount of credit line							$ 152,237
Maturity							2031
Borrowings											$ 1,000,000					$ 42,100,000,000	$ 22,000,000,000
Percent Of Decrease In Domestic Sales Of Refined Products									13.70%
Subsequent event [member] | Promissory Note [Member] | Promissory Notes Program [Member]
Disclosure of non-adjusting events after reporting period [line items]
Interest rate							2.48%				2.40%				2.48%		2.40%
Debt instruments issued															$ 4,000,000,000		$ 2,500,000,000
Maturity							2021
Subsequent event [member] | Petroleos Mexicanos [member] | Merge of Pemex Fertilizers [Member]
Disclosure of non-adjusting events after reporting period [line items]
Description About Merger of Subsidiaries								On December 2, 2020, the Board of Directors of Petróleos Mexicanos approved the merger of Pemex Industrial Transformation and Pemex Fertilizers. Effective as of January 1, 2021 Pemex Industrial Transformation will remain as merging company and Pemex Fertilizers became extinct as a merged company.
Merger Effective Date								0 days
Tax Benefit from Mexican Governmet [Member]
Disclosure of non-adjusting events after reporting period [line items]
Tax benefit on duty paid						$ 73,280,000,000
Financing from Revolving Credit Lines [Member]
Disclosure of non-adjusting events after reporting period [line items]
Obtain of revolving credit lines	$ 5,500,000	$ 37,000,000,000
Outstanding of revolving credit lines	$ 70,000								$ 70,000				$ 24,500,000,000
Financing from Revolving Credit Lines [Member] | PMI TRD DAC revolving credit lines [member]
Disclosure of non-adjusting events after reporting period [line items]
Repayments of revolving credit lines											$ 19,367,412
Proceeds from revolving credit lines											19,259,325
Borrowings											$ 2,387,065			$ 2,278,978
Crude Oil Price Movement [Member]
Disclosure of non-adjusting events after reporting period [line items]
Average prices of crude oil exports | $ / bbl	62.43	62.43									47.16	47.16
Percetnage of increase in crude oil price	32.00%	32.00%
Non Adjusting Event Reporting Period [Member] | Promissory Note [Member] | Promissory Notes Program [Member]
Disclosure of non-adjusting events after reporting period [line items]
Debt instruments issued			$ 4,000,000,000	$ 1,500,000,000	$ 2,000,000,000
Maturity			2021	2021	2021
Interest rate basis description			TIIE plus 248 basis points	TIIE plus 215 basis points	TIIE plus 238 basis points
Revenue From Mexican Government Bonds [Member]
Disclosure of non-adjusting events after reporting period [line items]
Interest income										$ 2,311,338,000
Revenue From Mexican Government Bonds [Member] | Petrleos Mexicanos [Member]
Disclosure of non-adjusting events after reporting period [line items]
Proceeds from government bonds										$ 2,492,147,000

Subsequent Events - Summary of

Subsequent Events - Summary of Government Contributions to Petróleos Mexicanos through the Ministry of Energy (Detail) - Subsequent Event [member] $ in Thousands	12 Months Ended
	Dec. 31, 2021MXN ($)
Disclosure Of Government Contributions [Line Items]
Contributions from government received	$ 109,174,000
January 22, 2021 [member]
Disclosure Of Government Contributions [Line Items]
Contributions from government received	12,000,000
February 11, 2021 [member]
Disclosure Of Government Contributions [Line Items]
Contributions from government received	10,000,000
February 24, 2021 [member]
Disclosure Of Government Contributions [Line Items]
Contributions from government received	32,062,000
March 5, 2021 [member]
Disclosure Of Government Contributions [Line Items]
Contributions from government received	7,000,000
March 26, 2021 [member]
Disclosure Of Government Contributions [Line Items]
Contributions from government received	2,000,000
April 5, 2021 [member]
Disclosure Of Government Contributions [Line Items]
Contributions from government received	5,000,000
April 26, 2021 [member]
Disclosure Of Government Contributions [Line Items]
Contributions from government received	2,050,000
May 3, 2021 [Member]
Disclosure Of Government Contributions [Line Items]
Contributions from government received	7,000,000
May 4, 2021 [Member]
Disclosure Of Government Contributions [Line Items]
Contributions from government received	$ 32,062,000

Subsidiary Guarantor Informat_3

Subsidiary Guarantor Information - Information (Detail)	12 Months Ended
	Dec. 31, 2020
Disclosure of subsidiaries [abstract]
Percentage of owned guarantors subsidiaries	100.00%

Subsidiary Guarantor Informat_4

Subsidiary Guarantor Information - Summary of Principal Amount Outstanding of Registered Debt Securities (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)
6.625% Guaranteed Bonds due 2035 [member] | Master Trust [member]
Supplemental information [line items]
Issuer	Petróleos Mexicanos
Guarantors	Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics
Principal amount outstanding (U.S. $)	$ 2,749,000
6.625% Guaranteed Bonds due 2038 [member] | Master Trust [member]
Supplemental information [line items]
Issuer	Petróleos Mexicanos
Guarantors	Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics
Principal amount outstanding (U.S. $)	$ 491,175
8.625% Bonds due 2022 [member] | Master Trust [member]
Supplemental information [line items]
Issuer	Petróleos Mexicanos
Guarantors	Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics
Principal amount outstanding (U.S. $)	$ 89,609
8.625% Guaranteed Bonds due 2023 [member] | Master Trust [member]
Supplemental information [line items]
Issuer	Petróleos Mexicanos
Guarantors	Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics
Principal amount outstanding (U.S. $)	$ 63,705
9.50% Guaranteed Bonds due 2027 [member] | Master Trust [member]
Supplemental information [line items]
Issuer	Petróleos Mexicanos
Guarantors	Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics
Principal amount outstanding (U.S. $)	$ 219,217
Floating Rate Notes due 2022 [member] | Petroleos Mexicanos [member]
Supplemental information [line items]
Issuer	Petróleos Mexicanos
Guarantors	Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics
Principal amount outstanding (U.S. $)	$ 500,448
9.50% Global Guaranteed Bonds due 2027 [member] | Petroleos Mexicanos [member]
Supplemental information [line items]
Issuer	Petróleos Mexicanos
Guarantors	Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics
Principal amount outstanding (U.S. $)	$ 102,149
5.50% Notes due 2021 [member] | Petroleos Mexicanos [member]
Supplemental information [line items]
Issuer	Petróleos Mexicanos
Guarantors	Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics
Principal amount outstanding (U.S. $)	$ 806,540
3.500% Notes due 2023 [member] | Petroleos Mexicanos [member]
Supplemental information [line items]
Issuer	Petróleos Mexicanos
Guarantors	Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics
Principal amount outstanding (U.S. $)	$ 1,143,938
4.875% Notes due 2024 [member] | Petroleos Mexicanos [member]
Supplemental information [line items]
Issuer	Petróleos Mexicanos
Guarantors	Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics
Principal amount outstanding (U.S. $)	$ 1,031,954
6.625% Notes due 2035 [member] | Petroleos Mexicanos [member]
Supplemental information [line items]
Issuer	Petróleos Mexicanos
Guarantors	Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics
Principal amount outstanding (U.S. $)	$ 2,749,000
6.500% Bonds due 2041 [member] | Petroleos Mexicanos [member]
Supplemental information [line items]
Issuer	Petróleos Mexicanos
Guarantors	Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics
Principal amount outstanding (U.S. $)	$ 1,560,521
4.875% Bonds 2022 [member] | Petroleos Mexicanos [member]
Supplemental information [line items]
Issuer	Petróleos Mexicanos
Guarantors	Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics
Principal amount outstanding (U.S. $)	$ 639,371
5.375% Notes due 2022 [member] | Petroleos Mexicanos [member]
Supplemental information [line items]
Issuer	Petróleos Mexicanos
Guarantors	Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics
Principal amount outstanding (U.S. $)	$ 447,340
5.50% Bonds due 2044 [member] | Petroleos Mexicanos [member]
Supplemental information [line items]
Issuer	Petróleos Mexicanos
Guarantors	Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics
Principal amount outstanding (U.S. $)	$ 793,638
6.375% Bonds due 2045 [member] | Petroleos Mexicanos [member]
Supplemental information [line items]
Issuer	Petróleos Mexicanos
Guarantors	Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics
Principal amount outstanding (U.S. $)	$ 1,560,461
5.625% Bonds due 2046 [member] | Petroleos Mexicanos [member]
Supplemental information [line items]
Issuer	Petróleos Mexicanos
Guarantors	Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics
Principal amount outstanding (U.S. $)	$ 947,279
4.500% Notes due 2026 [member] | Petroleos Mexicanos [member]
Supplemental information [line items]
Issuer	Petróleos Mexicanos
Guarantors	Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics
Principal amount outstanding (U.S. $)	$ 1,386,032
4.250% Notes due 2025 [member] | Petroleos Mexicanos [member]
Supplemental information [line items]
Issuer	Petróleos Mexicanos
Guarantors	Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics
Principal amount outstanding (U.S. $)	$ 790,153
6.375% Notes due 2021 [member] | Petroleos Mexicanos [member]
Supplemental information [line items]
Issuer	Petróleos Mexicanos
Guarantors	Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics
Principal amount outstanding (U.S. $)	$ 192,826
6.875% Notes due 2026 [member] | Petroleos Mexicanos [member]
Supplemental information [line items]
Issuer	Petróleos Mexicanos
Guarantors	Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics
Principal amount outstanding (U.S. $)	$ 2,970,334
4.625% Notes due 2023 [member] | Petroleos Mexicanos [member]
Supplemental information [line items]
Issuer	Petróleos Mexicanos
Guarantors	Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics
Principal amount outstanding (U.S. $)	$ 895,444
6.750% Bonds due 2047 [member] | Petroleos Mexicanos [member]
Supplemental information [line items]
Issuer	Petróleos Mexicanos
Guarantors	Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics
Principal amount outstanding (U.S. $)	$ 5,997,558
5.350% Bonds due 2028 [member] | Petroleos Mexicanos [member]
Supplemental information [line items]
Issuer	Petróleos Mexicanos
Guarantors	Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics
Principal amount outstanding (U.S. $)	$ 2,482,468
6.350% Bonds due 2048 [member] | Petroleos Mexicanos [member]
Supplemental information [line items]
Issuer	Petróleos Mexicanos
Guarantors	Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics
Principal amount outstanding (U.S. $)	$ 2,882,540
6.500% Notes due 2027 [member] | Petroleos Mexicanos [member]
Supplemental information [line items]
Issuer	Petróleos Mexicanos
Guarantors	Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics
Principal amount outstanding (U.S. $)	$ 5,478,577
5.950% Notes due 2031 [member] | Petroleos Mexicanos [member]
Supplemental information [line items]
Issuer	Petróleos Mexicanos
Guarantors	Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics
Principal amount outstanding (U.S. $)	$ 3,777,381
6.490% Notes due 2027 [member] | Petroleos Mexicanos [member]
Supplemental information [line items]
Issuer	Petróleos Mexicanos
Guarantors	Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics
Principal amount outstanding (U.S. $)	$ 2,341,377
6.840% Notes due 2030 [member] | Petroleos Mexicanos [member]
Supplemental information [line items]
Issuer	Petróleos Mexicanos
Guarantors	Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics
Principal amount outstanding (U.S. $)	$ 4,387,135
6.950% Bonds due 2060 [member] | Petroleos Mexicanos [member]
Supplemental information [line items]
Issuer	Petróleos Mexicanos
Guarantors	Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics
Principal amount outstanding (U.S. $)	$ 3,796,812
7.690% Bonds due 2050 [member] | Petroleos Mexicanos [member]
Supplemental information [line items]
Issuer	Petróleos Mexicanos
Guarantors	Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics
Principal amount outstanding (U.S. $)	$ 8,047,831
6.500% Notes due 2029 [member] | Petroleos Mexicanos [member]
Supplemental information [line items]
Issuer	Petróleos Mexicanos
Guarantors	Pemex Exploration and Production, Pemex Industrial Transformation and Pemex Logistics
Principal amount outstanding (U.S. $)	$ 1,986,963

Subsidiary Guarantor Informat_5

Subsidiary Guarantor Information - Supplemental Statement of Financial Position (Detail) $ in Thousands, $ in Thousands	Dec. 31, 2020USD ($)	Dec. 31, 2020MXN ($)	Dec. 31, 2019USD ($)	Dec. 31, 2019MXN ($)	Dec. 31, 2018MXN ($)	Dec. 31, 2017MXN ($)
Current assets
Cash and cash equivalents	$ 2,004,631	$ 39,989,781	$ 3,038,876	$ 60,621,631	$ 81,912,409	$ 97,851,754
Trade and other accounts receivable, derivative financial instruments and other current assets		237,264,297		199,741,214
Inventories	2,637,047	52,605,661		82,672,196
Total current assets	16,535,400	329,859,739		343,035,041
Investments in joint ventures and associates	602,301	12,015,129		14,874,579
Wells, pipelines, properties, plant and equipment-net	63,970,561	1,276,129,521		1,277,548,562
Long-term notes receivables		886,827		122,565,306
Right of use	2,967,374	59,195,257		70,818,314	72,760,580
Deferred taxes	5,440,415	108,529,199		136,166,747
Intangible assets	1,141,718	22,775,784		14,584,524
Mexican Government Bonds	5,589,986	111,512,962
Other assets	380,151	7,583,510		4,654,007
Total assets	96,672,361	1,928,487,928		1,984,247,080
Current liabilities
Current portion of long-term debt	19,605,151	391,097,267		244,924,185
Other current liabilities		381,312,804		307,279,443
Total current liabilities	38,719,820	772,410,071		552,203,628
Long-term debt	93,621,642	1,867,630,050		1,738,249,903
Employee benefits, provisions for sundry creditors, other liabilities and deferred taxes		1,693,174,837		1,625,202,851
Total liabilities	217,217,913	4,333,214,958		3,915,656,382
Equity (deficit), net	(120,545,552)	(2,404,727,030)		(1,931,409,302)	(1,459,405,432)	(1,502,377,342)
Total liabilities and equity	$ 96,672,361	1,928,487,928		1,984,247,080
Petroleos Mexicanos [member]
Current assets
Cash and cash equivalents		9,394,220		28,234,857	25,187,488	46,959,103
Trade and other accounts receivable, derivative financial instruments and other current assets		46,962,377		21,286,590
Accounts receivable—inter-company		800,429,251		592,503,940
Inventories		889,543		459,131
Total current assets		857,675,391		642,484,518
Long-term receivables—intercompany		1,824,398,719		1,692,840,909
Investments in joint ventures and associates		(1,358,455,811)		(980,054,315)
Wells, pipelines, properties, plant and equipment-net		8,548,022		9,706,301
Long-term notes receivables		1,999		121,626,851
Right of use		759,133		1,385,617
Deferred taxes		59,277,027		81,127,820
Intangible assets		25,650		130,535
Mexican Government Bonds		111,512,962
Total assets		1,503,743,092		1,569,248,236
Current liabilities
Current portion of long-term debt		334,770,935		209,291,307
Accounts payable-inter-company		1,360,720,755		1,275,967,793
Other current liabilities		18,629,284		23,694,401
Total current liabilities		1,714,120,974		1,508,953,501
Long-term debt		1,825,964,253		1,694,319,842
Employee benefits, provisions for sundry creditors, other liabilities and deferred taxes		368,754,587		363,041,463
Total liabilities		3,908,839,814		3,566,314,806
Equity (deficit), net		(2,405,096,722)		(1,997,066,570)
Total liabilities and equity		1,503,743,092		1,569,248,236
Subsidiary guarantors [member]
Current assets
Cash and cash equivalents		4,970,074		4,826,057	16,471,298	18,815,345
Trade and other accounts receivable, derivative financial instruments and other current assets		139,800,991		121,770,414
Accounts receivable—inter-company		1,061,537,492		1,134,820,799
Inventories		41,946,007		51,833,240
Total current assets		1,248,254,564		1,313,250,510
Investments in joint ventures and associates		45,295,025		10,757,092
Wells, pipelines, properties, plant and equipment-net		1,209,708,979		1,234,911,644
Long-term notes receivables		884,828		938,455
Right of use		56,949,499		67,564,544
Deferred taxes		45,431,025		50,735,224
Intangible assets		21,639,537		13,018,022
Other assets		780,426		564,971
Total assets		2,628,943,883		2,691,740,462
Current liabilities
Current portion of long-term debt		6,642,039		2,942,757
Accounts payable-inter-company		552,292,445		471,706,488
Other current liabilities		325,647,266		230,345,159
Total current liabilities		884,581,750		704,994,404
Long-term debt		27,513,661		28,300,551
Long-term payables-inter-company		1,825,630,931		1,694,801,416
Employee benefits, provisions for sundry creditors, other liabilities and deferred taxes		1,315,022,188		1,247,581,410
Total liabilities		4,052,748,530		3,675,677,781
Equity (deficit), net		(1,423,804,647)		(983,937,319)
Total liabilities and equity		2,628,943,883		2,691,740,462
Non-guarantor subsidiaries [member]
Current assets
Cash and cash equivalents		25,625,487		27,560,717	$ 40,253,623	$ 32,077,306
Trade and other accounts receivable, derivative financial instruments and other current assets		50,500,929		56,684,210
Accounts receivable—inter-company		131,931,674		129,911,984
Inventories		9,770,111		30,379,825
Total current assets		217,828,201		244,536,736
Long-term receivables—intercompany		988,069		1,615,441
Investments in joint ventures and associates		75,662,389		73,151,606
Wells, pipelines, properties, plant and equipment-net		57,872,520		32,930,617
Right of use		1,486,625		1,868,153
Deferred taxes		3,821,147		4,303,703
Intangible assets		1,110,597		1,435,967
Other assets		6,803,084		4,089,036
Total assets		365,572,632		363,931,259
Current liabilities
Current portion of long-term debt		49,684,293		32,690,121
Accounts payable-inter-company		78,413,852		106,934,283
Other current liabilities		37,036,254		53,239,883
Total current liabilities		165,134,399		192,864,287
Long-term debt		14,152,136		15,629,510
Long-term payables-inter-company		2,227,221		2,283,093
Employee benefits, provisions for sundry creditors, other liabilities and deferred taxes		9,398,062		14,579,978
Total liabilities		190,911,818		225,356,868
Equity (deficit), net		174,660,814		138,574,391
Total liabilities and equity		365,572,632		363,931,259
Eliminations [member]
Current assets
Accounts receivable—inter-company		(1,993,898,417)		(1,857,236,723)
Total current assets		(1,993,898,417)		(1,857,236,723)
Long-term receivables—intercompany		(1,825,386,788)		(1,694,456,350)
Investments in joint ventures and associates		1,249,513,526		911,020,196
Total assets		(2,569,771,679)		(2,640,672,877)
Current liabilities
Accounts payable-inter-company		(1,991,427,052)		(1,854,608,564)
Total current liabilities		(1,991,427,052)		(1,854,608,564)
Long-term payables-inter-company		(1,827,858,152)		(1,697,084,509)
Total liabilities		(3,819,285,204)		(3,551,693,073)
Equity (deficit), net		1,249,513,525		911,020,196
Total liabilities and equity		$ (2,569,771,679)		$ (2,640,672,877)

Subsidiary Guarantor Informat_6

Subsidiary Guarantor Information - Supplemental Statement of Comprehensive Income (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)	Dec. 31, 2020MXN ($)	Dec. 31, 2019MXN ($)	Dec. 31, 2018MXN ($)
Supplemental information [line items]
Net sales		$ 948,946,360	$ 1,392,862,505	$ 1,672,446,148
Services income	$ 236,381	4,715,484	9,108,680	8,673,002
Total of sales	47,805,715	953,661,844	1,401,971,185	1,681,119,150
Impairment of wells, pipelines, properties, plant and equipment		(36,353,700)	(31,283,154)	21,418,997
Cost of sales	41,737,792	832,614,690	1,122,933,424	1,199,511,561
Gross income	4,245,564	84,693,454	247,754,607	503,026,586
Other revenues (expenses), net		10,574,132	7,728,756	23,052,511
General expenses:
Total general expenses		158,330,686	152,654,733	158,678,690
Operating income	(3,161,261)	(63,063,100)	102,828,630	367,400,407
Financing cost, net		(127,927,053)	(126,889,660)	(111,428,513)
Foreign exchange income , net		(128,949,304)	86,930,388	23,659,480
Profit (loss) sharing in joint ventures and associates	(177,482)	(3,540,533)	(1,157,893)	1,527,012
(Loss) income before duties, taxes and other	(16,215,590)	(323,479,990)	61,711,465	281,158,386
Total taxes, duties and other		185,572,075	343,823,489	461,578,223
Net loss	(25,518,054)	(509,052,065)	(282,112,024)	(180,419,837)
Total other comprehensive result	(566,724)	(11,305,412)	(312,022,846)	223,391,747
Total comprehensive result for the year	$ (26,084,778)	(520,357,477)	(594,134,870)	42,971,910
Petroleos Mexicanos [member]
Supplemental information [line items]
Net sales			0
Services income		78,461,654	59,915,165	75,979,835
Total of sales		78,461,654	59,915,165	75,979,835
Impairment of wells, pipelines, properties, plant and equipment			0
Cost of sales		982,896	989,308	1,905,865
Gross income		77,478,758	58,925,857	74,073,970
Other revenues (expenses), net		170,887	139,412	73,183
General expenses:
Total general expenses		75,817,961	62,645,185	69,479,218
Operating income		1,831,684	(3,579,916)	4,667,935
Financing cost, net		(54,710,062)	(66,593,657)	(64,226,376)
Foreign exchange income , net		(1,778,917)	3,912,176	(3,832,933)
Profit (loss) sharing in joint ventures and associates		(433,417,288)	(292,585,923)	(125,246,527)
(Loss) income before duties, taxes and other		(488,074,583)	(358,847,320)	(188,637,901)
Total taxes, duties and other		20,804,230	(11,557,958)	(8,272,851)
Net loss		(508,878,813)	(347,289,362)	(180,365,050)
Total other comprehensive result		(6,062,096)	(55,495,859)	47,357,316
Total comprehensive result for the year		(514,940,909)	(402,785,221)	(133,007,734)
Subsidiary guarantors [member]
Supplemental information [line items]
Net sales		1,115,845,485	1,623,118,346	1,941,467,663
Services income		88,034,087	131,935,732	113,113,024
Total of sales		1,203,879,572	1,755,054,078	2,054,580,687
Impairment of wells, pipelines, properties, plant and equipment		(36,303,470)	(27,672,704)	25,384,888
Cost of sales		1,090,745,812	1,488,250,706	1,536,120,030
Gross income		76,830,290	239,130,668	543,845,545
Other revenues (expenses), net		5,733,633	3,048,907	(26,020,067)
General expenses:
Total general expenses		154,020,378	141,628,000	158,965,537
Operating income		(71,456,455)	100,551,575	358,859,941
Financing cost, net		(70,134,087)	(57,364,522)	(46,203,154)
Foreign exchange income , net		(125,864,355)	82,143,830	26,526,563
Profit (loss) sharing in joint ventures and associates		1,288,687	116,536	53,058
(Loss) income before duties, taxes and other		(266,166,210)	125,447,419	339,236,408
Total taxes, duties and other		159,451,307	352,239,318	466,788,123
Net loss		(425,617,517)	(226,791,899)	(127,551,715)
Total other comprehensive result		(12,844,301)	(253,482,329)	176,174,564
Total comprehensive result for the year		(438,461,818)	(480,274,228)	48,622,849
Non-guarantor subsidiaries [member]
Supplemental information [line items]
Net sales		459,202,040	712,266,064	912,726,857
Services income		12,253,482	9,683,190	5,960,807
Total of sales		471,455,522	721,949,254	918,687,664
Impairment of wells, pipelines, properties, plant and equipment		(50,230)	(3,610,450)	(3,965,891)
Cost of sales		460,296,695	705,101,991	910,525,715
Gross income		11,108,597	13,236,813	4,196,058
Other revenues (expenses), net		4,635,082	4,616,272	8,710,216
General expenses:
Total general expenses		9,198,761	11,974,223	10,248,039
Operating income		6,544,918	5,878,862	2,658,235
Financing cost, net		(3,066,150)	(2,953,372)	(475,599)
Foreign exchange income , net		(1,306,032)	874,382	965,850
Profit (loss) sharing in joint ventures and associates		(12,588,491)	(4,297,609)	2,164,868
(Loss) income before duties, taxes and other		(10,415,755)	(497,737)	5,313,354
Total taxes, duties and other		5,316,538	3,142,129	3,062,951
Net loss		(15,732,293)	(3,639,866)	2,250,403
Total other comprehensive result		7,600,985	(375,252)	(140,133)
Total comprehensive result for the year		(8,131,308)	(4,015,118)	2,110,270
Eliminations [member]
Supplemental information [line items]
Net sales		(626,101,165)	(942,521,905)	(1,181,748,372)
Services income		(174,033,739)	(192,425,407)	(186,380,664)
Total of sales		(800,134,904)	(1,134,947,312)	(1,368,129,036)
Impairment of wells, pipelines, properties, plant and equipment			0
Cost of sales		(719,410,713)	(1,071,408,581)	(1,249,040,049)
Gross income		(80,724,191)	(63,538,731)	(119,088,987)
Other revenues (expenses), net		34,530	(75,835)	40,289,179
General expenses:
Total general expenses		(80,706,414)	(63,592,675)	(80,014,104)
Operating income		16,753	(21,891)	1,214,296
Financing cost, net		(16,754)	21,891	(523,384)
Foreign exchange income , net			0
Profit (loss) sharing in joint ventures and associates		441,176,559	295,609,103	124,555,613
(Loss) income before duties, taxes and other		441,176,558	295,609,103	125,246,525
Total taxes, duties and other			0
Net loss		441,176,558	295,609,103	125,246,525
Total other comprehensive result			(2,669,406)
Total comprehensive result for the year		$ 441,176,558	$ 292,939,697	$ 125,246,525

Subsidiary Guarantor Informat_7

Subsidiary Guarantor Information - Supplemental Statement of Cash Flows (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)	Dec. 31, 2020MXN ($)	Dec. 31, 2019MXN ($)	Dec. 31, 2018MXN ($)
Operating activities:
Net (loss) income for the year		$ (509,052,065)	$ (282,112,024)	$ (180,419,837)
Income taxes and duties	$ 9,302,465	185,572,075	343,823,489	446,612,429
Adjustments to reconcile net loss to cash provided by operating activities:
Depreciation and amortization	6,498,259	129,631,820	137,187,010	153,382,040
Amortization of intangible assets	24,011	478,988	543,372	2,643,326
Impairment of wells, pipelines, properties, plant and equipment	1,822,359	36,353,700	31,283,154	(21,418,997)
Capitalized unsuccesful wells	548,793	10,947,702	71,604,308	15,443,086
Unsuccesful wells from intangible assets		8,404,284	7,990,877	(2,171,218)
Loss from derecognition of disposal of wells, pipelines, properties, plant and equipment	265,559	5,297,562	2,541,558	16,885,264
Disposal of intangible asset	19,857	396,118
Amortization of rights of use		7,229,231	7,429,275
Cancellation of rights of use	(55,241)	(1,101,987)
Gain on sale of subsidiary entity	(35,468)	(707,533)		(701,171)
Effects of net present value of reserve for well abandonment		4,555,692	(258,816)	(6,953,200)
Profit (loss) sharing in investments		3,540,533	1,157,893	(1,527,012)
Unrealized foreign exchange loss (gain)	6,640,345	132,466,243	(78,244,974)	(19,762,208)
Interest expense	8,109,062	161,765,242	132,861,340	123,869,684
Interest income	(839,255)	(16,742,048)	(29,235,603)	(9,520,962)
Taxes		(157,691,463)	(372,673,413)	29,032,735
Accounts receivable, accounts payable and derivative financial instruments		4,779,222	44,368,367	4,157,539
Other assets and other liabilities				(14,757,363)
Employee benefits		59,170,346	66,954,701	53,604,884
Net cash flows used in operating activities	3,273,081	65,293,662	85,220,514	141,786,590
Investing activities:
Acquisition of wells, pipelines, properties, plant and equipment and intangible assets		(138,618,156)	(126,873,931)	(108,960,689)
Other assets and other receivables		(2,521,487)	15,575,128
Proceeds from the sale of assets				4,078,344
Other assets				3,798,431
Net cash flows used in investing activities	(7,075,130)	(141,139,643)	(111,298,803)	(101,083,914)
Financing activities:
Increase in equity due to Certificates of Contributions "A"	2,318,748	46,256,000	122,131,000
Long-terms and interest received from the Mexican Government		5,800,940	38,704,883
Lease payments of principal and interest		(10,010,801)	(10,709,421)
Loans obtained from financial institutions	64,572,121	1,288,129,868	1,167,834,946	899,769,012
Debt payments, principal only		(1,151,962,147)	(1,185,042,283)	(841,033,392)
Interest paid	(6,566,300)	(130,989,150)	(127,945,203)	(115,289,389)
Inter-company increase (decrease) financing		0
Net cash flows from (used in) financing activities	2,367,308	47,224,710	4,973,922	(56,553,769)
Net decrease in cash and cash equivalents	(1,434,741)	(28,621,271)	(21,104,367)	(15,851,093)
Effects of change in cash value	400,496	7,989,421	(186,411)	(88,252)
Cash and cash equivalents at the beginning of the period	3,038,876	60,621,631	81,912,409	97,851,754
Cash and cash equivalents at the end of the period	$ 2,004,631	39,989,781	60,621,631	81,912,409
Petroleos Mexicanos [member]
Operating activities:
Net (loss) income for the year		(508,878,813)	(347,289,363)	(180,365,050)
Income taxes and duties		20,804,230	(11,557,958)
Adjustments to reconcile net loss to cash provided by operating activities:
Depreciation and amortization		1,066,176	1,183,741	1,274,179
Amortization of intangible assets		453,081	373,961	2,446,445
Loss from derecognition of disposal of wells, pipelines, properties, plant and equipment		94,065	14,115	872,527
Amortization of rights of use		644,838	639,877
Profit (loss) sharing in investments		441,125,283	296,230,824	125,246,527
Unrealized foreign exchange loss (gain)		117,158,102	(74,439,514)	(19,726,271)
Interest expense		134,335,289	118,543,971	109,697,028
Interest income		(11,617,299)	(22,964,784)	(9,520,962)
Taxes		1,349,021	(10,682,007)	(8,881,300)
Accounts receivable, accounts payable and derivative financial instruments		(16,644,218)	11,279,402	51,460,407
Other assets and other liabilities				559,449
Employee benefits		(355,666)	52,052,212	10,519,603
Inter-company charges and deductions		(147,308,477)	(439,039,267)	(14,527,177)
Net cash flows used in operating activities		32,225,612	(425,654,790)	69,055,405
Investing activities:
Acquisition of wells, pipelines, properties, plant and equipment and intangible assets		(349,555)	(232,592)	(1,162,685)
Other assets and other receivables		930,596	14,743,694
Other assets				3,586,010
(Increase) decrease due to Inter-company investing		(194,281,597)	401,422,502	(47,454,385)
Net cash flows used in investing activities		(193,700,556)	415,933,604	(45,031,060)
Financing activities:
Increase in equity due to Certificates of Contributions "A"		46,256,000	122,131,000
Long-terms and interest received from the Mexican Government		5,800,940	38,704,883
Lease payments of principal and interest		(396,917)	(588,463)
Loans obtained from financial institutions		730,222,863	824,049,426	510,871,366
Debt payments, principal only		(601,448,338)	(851,077,341)	(450,353,531)
Interest paid		(122,553,204)	(120,450,950)	(106,313,795)
Inter-company increase (decrease) financing		84,752,963
Net cash flows from (used in) financing activities		142,634,307	12,768,555	(45,795,960)
Net decrease in cash and cash equivalents		(18,840,637)	3,047,369	(21,771,615)
Cash and cash equivalents at the beginning of the period		28,234,857	25,187,488	46,959,103
Cash and cash equivalents at the end of the period		9,394,220	28,234,857	25,187,488
Subsidiary guarantors [member]
Operating activities:
Net (loss) income for the year		(425,617,517)	(225,457,279)	(127,551,718)
Income taxes and duties		159,451,307	352,291,238
Adjustments to reconcile net loss to cash provided by operating activities:
Depreciation and amortization		126,778,686	134,134,135	149,747,232
Amortization of intangible assets		(30,155)	86,342	86,332
Impairment of wells, pipelines, properties, plant and equipment		36,303,471	27,672,705	(25,384,888)
Capitalized unsuccesful wells		10,947,702	71,604,308	15,443,086
Unsuccesful wells from intangible assets		8,404,284	7,990,877	(2,171,218)
Loss from derecognition of disposal of wells, pipelines, properties, plant and equipment		3,004,053	1,492,916	12,226,128
Amortization of rights of use		5,453,688	5,439,642
Cancellation of rights of use		(1,101,987)
Gain on sale of subsidiary entity				(10,257)
Effects of net present value of reserve for well abandonment		4,555,692	(258,816)	(6,953,200)
Profit (loss) sharing in investments		(41,685)	(538,281)	(538,281)
Unrealized foreign exchange loss (gain)		12,040,638	(2,867,091)	446,523
Interest expense		25,908,927	12,446,222	12,720,032
Interest income		(5,124,749)	(5,410,645)
Taxes		(155,315,035)	(356,254,147)	38,071,896
Accounts receivable, accounts payable and derivative financial instruments		(692,255)	32,413,620	(73,421,161)
Other assets and other liabilities				(12,071,857)
Employee benefits		64,873,037	9,322,327	44,858,697
Inter-company charges and deductions		37,878,271	176,676,691	81,240,429
Net cash flows used in operating activities		(92,323,627)	240,784,764	106,737,775
Investing activities:
Acquisition of wells, pipelines, properties, plant and equipment and intangible assets		(97,841,648)	(132,206,201)	(103,408,759)
Other assets and other receivables		(812,028)	933,269
Proceeds from the sale of assets				14,568
Other assets				212,421
Net cash flows used in investing activities		(98,653,676)	(131,272,932)	(103,181,770)
Financing activities:
Increase in equity due to Certificates of Contributions "A"			41,956,917
Lease payments of principal and interest		(8,266,969)	(8,745,025)
Loans obtained from financial institutions		1,046	46,297
Debt payments, principal only		(4,828,154)	(4,826,936)	(6,662,318)
Interest paid		(7,200,077)	(6,104,160)	(7,857,926)
Inter-company increase (decrease) financing		211,415,474	(143,484,166)	8,620,192
Net cash flows from (used in) financing activities		191,121,320	(121,157,073)	(5,900,052)
Net decrease in cash and cash equivalents		144,017	(11,645,241)	(2,344,047)
Cash and cash equivalents at the beginning of the period		4,826,057	16,471,298	18,815,345
Cash and cash equivalents at the end of the period		4,970,074	4,826,057	16,471,298
Non-guarantor subsidiaries [member]
Operating activities:
Net (loss) income for the year		(15,507,766)	(4,974,486)	2,305,189
Income taxes and duties		5,316,538	3,090,209
Adjustments to reconcile net loss to cash provided by operating activities:
Depreciation and amortization		1,786,958	1,869,134	2,360,629
Amortization of intangible assets		56,062	83,069	110,549
Impairment of wells, pipelines, properties, plant and equipment		50,229	3,610,449	3,965,891
Loss from derecognition of disposal of wells, pipelines, properties, plant and equipment		2,199,444	1,034,527	3,786,609
Disposal of intangible asset		396,118
Amortization of rights of use		1,130,705	1,349,756
Gain on sale of subsidiary entity		(707,533)		(690,914)
Profit (loss) sharing in investments		3,582,218	(1,473,955)	(1,473,955)
Unrealized foreign exchange loss (gain)		3,267,503	(938,369)	(482,460)
Interest expense		1,521,026	1,871,147	1,452,624
Interest income			(860,174)
Taxes		(3,725,449)	(5,737,259)	(157,861)
Accounts receivable, accounts payable and derivative financial instruments		22,115,695	675,345	26,118,293
Other assets and other liabilities				(3,244,955)
Employee benefits		(5,347,025)	5,580,162	(1,773,416)
Inter-company charges and deductions		35,319,045	5,349,241	(21,516,287)
Net cash flows used in operating activities		51,453,768	10,528,796	10,759,936
Investing activities:
Acquisition of wells, pipelines, properties, plant and equipment and intangible assets		(40,426,953)	5,564,862	(4,389,245)
Other assets and other receivables		(2,640,055)	(101,835)
Proceeds from the sale of assets				4,063,776
(Increase) decrease due to Inter-company investing		627,372
Net cash flows used in investing activities		(42,439,636)	5,463,027	(325,469)
Financing activities:
Increase in equity due to Certificates of Contributions "A"			(41,956,917)
Lease payments of principal and interest		(1,346,915)	(1,375,933)
Loans obtained from financial institutions		557,905,959	343,739,223	388,897,646
Debt payments, principal only		(545,685,655)	(329,138,006)	(384,017,543)
Interest paid		(1,235,869)	(1,390,093)	(1,117,668)
Inter-company increase (decrease) financing		(28,576,303)	1,623,408	(5,932,333)
Net cash flows from (used in) financing activities		(18,938,783)	(28,498,318)	(2,169,898)
Net decrease in cash and cash equivalents		(9,924,651)	(12,506,495)	8,264,569
Effects of change in cash value		7,989,421	(186,411)	(88,252)
Cash and cash equivalents at the beginning of the period		27,560,717	40,253,623	32,077,306
Cash and cash equivalents at the end of the period		25,625,487	27,560,717	40,253,623
Eliminations [member]
Operating activities:
Net (loss) income for the year		440,952,031	295,609,104	125,191,742
Adjustments to reconcile net loss to cash provided by operating activities:
Effects of net present value of reserve for well abandonment		0
Profit (loss) sharing in investments		(441,125,283)	(293,060,695)	(124,761,303)
Inter-company charges and deductions		74,111,161	257,013,335	(45,196,965)
Net cash flows used in operating activities		73,937,909	259,561,744	(44,766,526)
Investing activities:
(Increase) decrease due to Inter-company investing		193,654,225	(401,422,502)	47,454,385
Net cash flows used in investing activities		193,654,225	(401,422,502)	47,454,385
Financing activities:
Inter-company increase (decrease) financing		(267,592,134)	141,860,758	(2,687,859)
Net cash flows from (used in) financing activities		$ (267,592,134)	$ 141,860,758	$ (2,687,859)

Supplementary Information on _3

Supplementary Information on Oil and Gas Exploration and Production Activities (Unaudited) - Summary of Capitalized Costs for Oil and Gas Producing Activities (Detail) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure Of Oil And Gas Producing Activities [line items]
Net capitalized costs	$ 772,882,060	$ 681,363,190	$ 983,691,847
Proved properties [member]
Disclosure Of Oil And Gas Producing Activities [line items]
Net capitalized costs	2,483,134,177	2,306,255,209	2,505,307,260
Construction in progress [member]
Disclosure Of Oil And Gas Producing Activities [line items]
Net capitalized costs	64,911,619	50,951,279	51,033,968
Accumulated depreciation and amortization [member]
Disclosure Of Oil And Gas Producing Activities [line items]
Net capitalized costs	$ (1,775,163,736)	$ (1,675,843,298)	$ (1,572,649,381)

Supplementary Information on _4

Supplementary Information on Oil and Gas Exploration and Production Activities (Unaudited) - Summary of Costs Incurred for Oil and Gas Property Exploration and Development Activities (Detail) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure Of Oil And Gas Producing Activities [line items]
Total costs incurred	$ 43,593,642	$ 67,106,181	$ 88,145,519
Exploration [member]
Disclosure Of Oil And Gas Producing Activities [line items]
Total costs incurred	33,986,110	31,222,023
Development [member]
Disclosure Of Oil And Gas Producing Activities [line items]
Total costs incurred	97,041,516	82,135,240
Previously Reported [Member]
Disclosure Of Oil And Gas Producing Activities [line items]
Total costs incurred	$ 131,027,626	$ 113,357,263

Supplementary Information On _5

Supplementary Information On Oil And Gas Exploration And Production Activities (Unaudited) - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2020MXN ($)MMBblsBcfbbl	Dec. 31, 2019MXN ($)MMBblsBcf	Dec. 31, 2018
Disclosure of detailed information about property, plant and equipment [abstract]
Exploration costs for geological and geophysical studies | $	$ 9,599,274	$ 10,663,334
Estimated reserves percentage	97.80%
Remaining estimated reserve percentage	2.20%
Percentage of developed and undeveloped reserves	1.30%
Developed and undeveloped reserves increase decrease | MMBbls	6,041	5,960.6
Percentage of developed reserves	0.50%
Developed reserves increase decrease | MMBbls	3,603.4	3,585
Developed and undeveloped reserves added to offset | MMBbls	694.8
Percenatge of developed and undeveloped dry gas reserves increased	10.00%
Developed and undeveloped dry gas reserves increase decrease | Bcf	6,984.2	6,351.7
Percentage of developed dry gas reserves increase	8.70%
Developed dry gas reserves increase decrease | Bcf	3,922.3	3,608.5
Developed and undeveloped dry gas reserves added to offset | Bcf	818.7
Percentage of undeveloped dry gas reserves increase	11.60%
Undeveloped dry gas reserves increase decrease | Bcf	3,061.9	2,743.1
Exploratoroy activity in shallow waters and onshore regions incorporated | MMBbls	130.6
Increase of proved reserves | bbl	1,019.9
Reserve-replacement ratio	119.70%	120.10%
Reserves production ratio of proved reserves, period	8 years 8 months 12 days
Proved reserves after net cash flows discount factor	10.00%	10.00%	10.00%

Supplementary Information on _6

Supplementary Information on Oil and Gas Exploration and Production Activities (Unaudited) - Summary of Results of Operations for Oil and Gas Producing Activities (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2020MXN ($)USD-BoeUSD-BarrelUSD-Mcf	Dec. 31, 2019MXN ($)USD-BoeUSD-BarrelUSD-Mcf	Dec. 31, 2018MXN ($)USD-BoeUSD-BarrelUSD-Mcf
Disclosure of detailed information about property, plant and equipment [line items]
Revenues from sale of oil and gas	$ 558,051,547	$ 762,102,939	$ 910,433,244
Hydrocarbon duties	154,609,136	343,242,436	443,491,451
Production costs (excluding taxes)	257,571,641	275,090,795	273,695,691
Other costs and expenses	(7,024,695)	(6,910,321)	(10,109,114)
Exploration expenses	31,868,857	90,258,519	30,953,413
Depreciation, depletion, amortization and accretion	845,380	222,651,461	28,845,604
Total production costs	437,870,319	924,332,890	766,877,047
Results of operations for oil and gas producing activities	$ 120,181,228	$ (162,229,951)	$ 143,556,198
Oil Equivalent [member]
Disclosure of detailed information about property, plant and equipment [line items]
Average sales price | USD-Boe	27.86	43.52	50.89
Crude oil [member]
Disclosure of detailed information about property, plant and equipment [line items]
Average sales price | USD-Barrel	35.47	57.13	62.99
Natural gas [member]
Disclosure of detailed information about property, plant and equipment [line items]
Average sales price | USD-Mcf	2.54	3.55	5.57

Supplementary Information on _7

Supplementary Information on Oil and Gas Exploration And Production Activities (Unaudited) - Summary of Oil and Gas Proved Reserves (Detail)	12 Months Ended
	Dec. 31, 2020MMBblsBcf
Crude Oil Condensates [Member]
Proved developed and un-developed reserves:
Proved developed reserves | MMBbls	3,603,400,000
Proved undeveloped reserves | MMBbls	2,437,600,000
Total proved reserves | MMBbls	6,041
Dry Gas [Member]
Proved developed and un-developed reserves:
Proved developed reserves | Bcf	3,922,300,000,000
Proved undeveloped reserves | Bcf	3,061,900,000,000
Total proved reserves | Bcf	6,984.2

Supplementary Information on _8

Supplementary Information on Oil and Gas Exploration and Production Activities (Unaudited) - Disclosure of Proved Developed and Undeveloped Reserve (Detail)	12 Months Ended
	Dec. 31, 2020MMBblsBcf	Dec. 31, 2019MMBblsBcf	Dec. 31, 2018MMBblsBcf
Crude Oil Reserves [member]
Proved developed and undeveloped reserves:
Beginning balance | MMBbls	5,961	5,786	6,427
Revisions | MMBbls	651	784	22
Extensions and discoveries | MMBbls	97	78	140
Production | MMBbls	(695)	(687)	(744)
Farm outs and transfer to E&P contracts (CEE) and transfers of fields due to CNH bidding process | MMBbls	27		(59)
Ending Balance | MMBbls	6,041	5,961	5,786
Proved developed reserves at December 31 | MMBbls	3,603	3,585	3,588
Proved undeveloped reserves at December 31 | MMBbls	2,438	2,376	2,198
Dry gas reserve [member]
Proved developed and undeveloped reserves:
Beginning balance | Bcf	6,352	6,370	6,593
Revisions | Bcf	1,240	656	3
Extensions and discoveries | Bcf	176	196	809
Production | Bcf	(819)	(870)	(887)
Farm outs and transfer to E&P contracts (CEE) and transfers of fields due to CNH bidding process | Bcf	35		(148)
Ending Balance | Bcf	6,984	6,352	6,370
Proved developed reserves at December 31 | Bcf	3,922	3,609	3,380
Proved undeveloped reserves at December 31 | Bcf	3,062	2,743	2,990

Supplementary Information on _9

Supplementary Information on Oil and Gas Exploration and Production Activities (Unaudited) - Disclosure of Standardized Measure of Discounted Future Net Cash Flows (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Future Net Cash Flows Relating To Proved Oil And Gas Reserves [abstract]
Future cash inflows	$ 201,777	$ 330,286	$ 321,065
Future production costs (excluding profit taxes)	(109,064)	(114,782)	(103,498)
Future development costs	(23,631)	(37,540)	(22,224)
Future cash flows before tax	69,082	177,964	195,343
Future production and excess gains taxes	(73,122)	(134,174)	(156,691)
Future net cash flows	(4,040)	43,790	38,652
Effect of discounting net cash flows by 10%	3,359	(18,807)	(12,434)
Standardized measure of discounted future net cash flows	$ (681)	$ 24,983	$ 26,218

Supplementary Information on_10

Supplementary Information on Oil and Gas Exploration and Production Activities (Unaudited) - Disclosure of Changes in standardized Measure of Discounted Future Net Cash Flows (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure - Supplementary Information on Oil and Gas Exploration and Production Activities (Unaudited) - Disclosure of Changes in standardized Measure of Discounted Future Net Cash Flows [Abstract]
Sales of oil and gas produced, net of production costs	$ (16,968)	$ (29,530)	$ (31,279)
Net changes in prices and production costs	(39,509)	73,278	62,902
Extensions and discoveries	1,426	1,658	4,323
Development cost incurred during the year	4,654	4,281	2,984
Changes in estimated development costs	(10,019)	3,341	(2,146)
Reserves revisions and timing changes	5,808	(19,615)	1,511
Accretion of discount of pre-tax net cash flows	5,929	(9,305)	6,628
Net changes in production and excess gains taxes	23,015	(25,343)	(22,818)
Aggregate change in standardized measure of discounted future net cash flows	(25,664)	(1,235)	22,105
As of January 1	24,983	26,218	4,113
As of December 31	(681)	24,983	26,218
Change	$ (25,664)	$ (1,235)	$ 22,105