Mexican Petroleum 20-F 30 Apr 18 2017 FY Annual report (foreign) Financial data

Document and Entity Information

Document and Entity Information	12 Months Ended
	Dec. 31, 2017shares
Document - Document and Entity Information [Abstract]
Document Type	20-F
Amendment Flag	false
Document Period End Date	Dec. 31, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	FY
Trading Symbol	CK0000932782
Entity Registrant Name	MEXICAN PETROLEUM
Entity Central Index Key	932,782
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	No
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding	0

Consolidated Statements of Fina

Consolidated Statements of Financial Position $ in Thousands, $ in Thousands	Dec. 31, 2017USD ($)	Dec. 31, 2017MXN ($)	Dec. 31, 2016MXN ($)
Current assets:
Cash and cash equivalents	$ 4,945,330	$ 97,851,754	$ 163,532,513
Accounts receivable, net	8,624,239	170,645,234	133,220,527
Inventories, net	3,227,366	63,858,930	45,892,060
Held-for-sale current non-financial assets		1,056,918	7,460,674
Available-for-sale financial assets	53,416	1,056,918	2,852,679
Derivative financial instruments	1,521,904	30,113,454	4,857,470
Total current assets	18,372,255	363,526,290	357,815,923
Non-current assets:
Available-for-sale financial assets			6,027,540
Investments in joint ventures and associates	844,373	16,707,364	20,737,509
Wells, pipelines, properties, plant and equipment, net	72,599,743	1,436,509,326	1,667,742,248
Long-term notes receivable	7,504,683	148,492,909	148,607,602
Deferred taxes	7,388,422	146,192,485	100,324,689
Restricted cash			10,478,626
Intangible assets	459,327	9,088,563	8,639,242
Other assets	580,449	11,485,177	9,512,645
Total non-current assets	89,376,997	1,768,475,824	1,972,070,101
Total assets	107,749,252	2,132,002,114	2,329,886,024
Current liabilities:
Short-term debt and current portion of long-term debt	7,945,209	157,209,467	176,166,188
Suppliers	7,073,205	139,955,378	151,649,540
Taxes and duties payable	2,577,740	51,004,960	48,839,595
Accounts and accrued expenses payable	1,173,081	23,211,401	18,666,607
Derivative financial instruments	896,864	17,745,979	30,867,956
Total current liabilities	19,666,099	389,127,185	426,189,886
Long-term liabilities:
Long-term debt	95,046,956	1,880,665,604	1,807,004,542
Employee benefits	63,600,101	1,258,436,122	1,220,409,436
Provisions for sundry creditors	4,431,129	87,677,423	88,317,878
Other liabilities	717,363	14,194,237	16,837,893
Deferred taxes	214,988	4,253,928	4,134,536
Total long-term liabilities	164,010,537	3,245,227,314	3,136,704,285
Total liabilities	183,676,636	3,634,354,499	3,562,894,171
Controlling interest:
Certificates of Contribution "A"	18,019,399	356,544,447	356,544,447
Mexican Government contributions	2,210,100	43,730,591	43,730,591
Legal reserve	50,647	1,002,130	1,002,130
Accumulated other comprehensive result	(7,676,226)	(151,887,182)	(163,399,441)
Accumulated deficit:
From prior years	(74,386,461)	(1,471,862,579)	(1,280,216,973)
Net loss for the year	(14,193,620)	(280,844,899)	(191,645,606)
Total controlling interest	(75,976,160)	(1,503,317,492)	(1,233,984,852)
Total non-controlling interest	48,776	965,107	976,705
Total equity (deficit), net	(75,927,384)	(1,502,352,385)	(1,233,008,147)
Total liabilities and equity (deficit), net	$ 107,749,252	$ 2,132,002,114	$ 2,329,886,024

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)	Dec. 31, 2017MXN ($)	Dec. 31, 2016MXN ($)	Dec. 31, 2015MXN ($)
Net sales:
Domestic	$ 44,340,898	$ 877,360,038	$ 670,000,473	$ 746,235,912
Export	25,701,057	508,539,112	395,118,117	407,214,445
Services income	562,528	11,130,569	8,974,642	8,310,035
Total of sales	70,604,483	1,397,029,719	1,074,093,232	1,161,760,392
Impairment (reversal) of wells, pipelines, properties, plant and equipment, net	7,653,856	151,444,560	(331,314,343)	477,944,690
Benefit from change in pension plan				(92,177,089)
Cost of sales	50,751,509	1,004,204,880	865,822,221	891,964,606
Gross income (loss)	12,199,118	241,380,279	539,585,354	(115,971,815)
Other revenues (expenses), net	261,493	5,174,076	22,649,606	(875,487)
General expenses:
Distribution, transportation and sale expenses	1,106,282	21,889,670	25,231,240	28,928,639
Administrative expenses	6,061,620	119,939,454	112,653,533	112,472,095
Benefit from change in pension plan				(103,860,955)
Operating income	5,292,708	104,725,231	424,350,187	(154,387,081)
Financing income	817,006	16,165,853	13,749,255	14,990,859
Financing cost	(5,945,638)	(117,644,548)	(98,844,464)	(67,773,593)
Derivative financial instruments income (cost), net	1,280,574	25,338,324	(14,000,987)	(21,449,877)
Foreign exchange income (loss), net	1,171,702	23,184,122	(254,012,743)	(154,765,574)
Subtotal	(2,676,356)	(52,956,249)	(353,108,939)	(228,998,185)
Profit sharing in joint ventures and associates	18,216	360,440	2,135,845	2,318,115
Income (loss) before taxes, duties and other	2,634,569	52,129,422	73,377,093	(381,067,151)
Profit sharing duty, net	17,084,416	338,044,209	277,161,804	377,087,514
Income tax	(255,938)	(5,064,168)	(12,640,369)	(45,587,267)
Total duties, taxes and other	16,828,478	332,980,041	264,521,435	331,500,247
Net (loss) income	(14,193,909)	(280,850,619)	(191,144,342)	(712,567,398)
Items that will be reclassified subsequently to profit or loss:
Available-for-sale financial assets	281,206	5,564,130	207,817	(3,206,316)
Currency translation effect	(308,109)	(6,096,459)	21,386,903	13,262,101
Items that will not be reclassified subsequently to profit or loss:
Actuarial gains-employee benefits	608,424	12,038,710	106,277,761	78,556,569
Total other comprehensive results	581,521	11,506,381	127,872,481	88,612,354
Total comprehensive loss	(13,612,388)	(269,344,238)	(63,271,861)	(623,955,044)
Net loss attributable to:
Controlling interest	(14,193,620)	(280,844,899)	(191,645,606)	(712,434,997)
Non-controlling interest	(289)	(5,720)	501,264	(132,401)
Net (loss) income	(14,193,909)	(280,850,619)	(191,144,342)	(712,567,398)
Other comprehensive results attributable to:
Controlling interest	581,818	11,512,259	127,650,318	88,571,493
Non-controlling interest	(297)	(5,878)	222,163	40,861
Total other comprehensive results	581,521	11,506,381	127,872,481	88,612,354
Comprehensive (loss) income:
Controlling interest	(13,611,802)	(269,332,640)	(63,995,288)	(623,863,504)
Non-controlling interest	(586)	(11,598)	723,427	(91,540)
Total comprehensive loss	$ (13,612,388)	$ (269,344,238)	$ (63,271,861)	$ (623,955,044)

Consolidated Statements of Chan

Consolidated Statements of Changes in Equity (Deficit), Net $ in Thousands, $ in Thousands	USD ($)	MXN ($)	Increase in Certificates of Contribution "A" [member]MXN ($)	Certificates of Contribution "A" [member]USD ($)	Certificates of Contribution "A" [member]MXN ($)	Certificates of Contribution "A" [member]Increase in Certificates of Contribution "A" [member]MXN ($)	Mexican Government contributions [member]USD ($)	Mexican Government contributions [member]MXN ($)	Legal Reserve [member]USD ($)	Legal Reserve [member]MXN ($)	Accumulated other comprehensive income (loss) [member]Available-for-sale financial assets [member]MXN ($)	Accumulated other comprehensive income (loss) [member]Cumulative currency translation effect [member]USD ($)	Accumulated other comprehensive income (loss) [member]Cumulative currency translation effect [member]MXN ($)	Accumulated other comprehensive income (loss) [member]Actuarial (losses) gains on employee benefits effect [member]USD ($)	Accumulated other comprehensive income (loss) [member]Actuarial (losses) gains on employee benefits effect [member]MXN ($)	Accumulated deficit [member]USD ($)	Accumulated deficit [member]MXN ($)	Equity attributable to owners of parent [member]USD ($)	Equity attributable to owners of parent [member]MXN ($)	Equity attributable to owners of parent [member]Increase in Certificates of Contribution "A" [member]MXN ($)	Non-controlling interests [member]USD ($)	Non-controlling interests [member]MXN ($)
Beginning balance (From prior years [member]) at Dec. 31, 2014																	$ (552,808,762)
Beginning balance at Dec. 31, 2014		$ (767,720,854)			$ 134,604,835			$ 43,730,591		$ 1,002,130	$ (2,565,631)		$ 16,320,433		$ (408,349,268)				$ (768,065,672)			$ 344,818
Increase decrease through other contributions by owners			$ 60,000,000			$ 60,000,000														$ 60,000,000
Total comprehensive (loss) income		(623,955,044)									(3,206,316)		13,229,927		78,547,882		(712,434,997)		(623,863,504)			(91,540)
Balances as of December 31, 2017 (Unaudited U.S. dollars) (From prior years [member]) at Dec. 31, 2015																	(552,808,762)
Balances as of December 31, 2017 (Unaudited U.S. dollars) at Dec. 31, 2015		(1,331,675,898)			194,604,835			43,730,591		1,002,130	(5,771,947)		29,550,360		(329,801,386)		(712,434,997)		(1,331,929,176)			253,278
Transfer to accumulated deficit | From prior years [member]																	(712,434,997)
Transfer to accumulated deficit																	712,434,997
Increase decrease through other contributions by owners			$ 161,939,612			$ 161,939,612														$ 161,939,612
Reclassification of other comprehensive income | From prior years [member]																	(14,973,214)
Reclassification of other comprehensive income															14,973,214
Total comprehensive (loss) income		(63,271,861)									207,817		21,169,662		106,272,839		(191,645,606)		(63,995,288)			723,427
Balances as of December 31, 2017 (Unaudited U.S. dollars) (From prior years [member]) at Dec. 31, 2016																	(1,280,216,973)
Balances as of December 31, 2017 (Unaudited U.S. dollars) at Dec. 31, 2016		(1,233,008,147)			356,544,447			43,730,591		1,002,130	(5,564,130)		50,720,022		(208,555,333)		(191,645,606)		(1,233,984,852)			976,705
Transfer to accumulated deficit | From prior years [member]																	(191,645,606)
Transfer to accumulated deficit																	191,645,606
Total comprehensive (loss) income	$ (13,612,388)	(269,344,238)									$ 5,564,130		(6,087,010)		12,035,139		(280,844,899)		(269,332,640)			(11,598)
Balances as of December 31, 2017 (Unaudited U.S. dollars) (From prior years [member]) at Dec. 31, 2017																$ (74,386,461)	(1,471,862,579)
Balances as of December 31, 2017 (Unaudited U.S. dollars) at Dec. 31, 2017	$ (75,927,384)	$ (1,502,352,385)		$ 18,019,399	$ 356,544,447		$ 2,210,100	$ 43,730,591	$ 50,647	$ 1,002,130		$ 2,255,708	$ 44,633,012	$ (9,931,934)	$ (196,520,194)	$ (14,193,620)	$ (280,844,899)	$ (75,976,160)	$ (1,503,317,492)		$ 48,776	$ 965,107

Consolidated Statements of Cash

Consolidated Statements of Cash Flows $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)	Dec. 31, 2017MXN ($)	Dec. 31, 2016MXN ($)	Dec. 31, 2015MXN ($)
Operating activities
Net (loss)	$ (14,193,909)	$ (280,850,619)	$ (191,144,342)	$ (712,567,398)
Depreciation and amortization	7,919,689	156,704,513	150,439,491	167,951,250
(Reversal) impairment of wells, pipelines, properties, plant and equipment	7,653,856	151,444,560	(331,314,343)	477,944,690
Unsuccessful wells	311,554	6,164,624	29,106,084	23,213,519
Exploration costs	(73,168)	(1,447,761)	(2,022,826)	(5,698,511)
Disposal of wells, pipelines, properties, plant and equipment	862,381	17,063,671	3,771,287	24,638,537
Loss in sale of fixed assets			27,882,480
Gain on sale of share in joint ventures and associates	(158,647)	(3,139,103)	(15,211,039)	(680,630)
Profit share in joint ventures and associates	(18,216)	(360,440)	(2,135,845)	(2,318,115)
Decrease on available-for-sale financial assets	68,743	1,360,205
Impairment of goodwill			4,007,018
Disposal of held-for-sale current non-financial assets	141,932	2,808,360
Dividends	(9,131)	(180,675)	(293,397)	(359,941)
Effects of net present value of reserve for well abandonment	392,890	7,774,000	11,968,966	(608,160)
Net loss on available-for-sale financial assets	178,087	3,523,748
Unrealized foreign exchange (income) loss	(843,265)	(16,685,439)	243,182,764	152,676,256
Interest expense	5,945,638	117,644,548	98,844,464	67,773,593
Net cash flows (used in) from operating activities	8,178,434	161,824,192	27,080,762	191,965,090
Derivative financial instruments	(1,939,584)	(38,377,961)	310,905	9,802,397
Accounts receivable	(1,370,831)	(27,124,228)	(55,104,439)	33,003,083
Inventories	(908,028)	(17,966,870)	(1,358,879)	6,167,728
Long-term receivables	5,796	114,693	(3,277,724)
Intangible assets	(261,094)	(5,166,184)	(19,745,821)
Other assets	(99,690)	(1,972,532)	(2,104,985)	(16,602,365)
Accounts payable and accrued expenses	229,689	4,544,794	3,097,660	1,002,403
Taxes and duties payable	19,144,463	378,805,745	311,015,217	384,109,597
Taxes and duties paid	(19,062,925)	(377,192,377)	(301,050,325)	(351,370,004)
Suppliers	(591,011)	(11,694,162)	(15,664,703)	51,135,948
Provisions for sundry creditors	(339,351)	(6,714,632)	(11,413,361)	(41,239,700)
Employee benefits	2,530,255	50,065,396	47,293,069	(116,022,232)
Deferred taxes	(2,312,079)	(45,748,404)	(43,802,181)	(53,014,159)
Net cash flows from (used in) operating activities	3,204,044	63,397,470	(41,898,083)	98,937,786
Investing activities
Acquisition of wells, pipelines, properties, plant and equipment	(4,642,485)	(91,859,465)	(151,408,480)	(253,514,001)
Proceeds from available-for-sale financial assets	405,668	8,026,836
Proceeds from the sale of associates	158,779	3,141,710	22,684,736	4,417,138
Proceeds from the sale of fixed assets			560,665
Investments in associates				(36,214)
Business acquisition			(4,329,769)
Net cash flows used in investing activities	(4,078,038)	(80,690,919)	(132,492,848)	(249,133,077)
Financing activities
Increase in equity due to Certificates of Contributions "A"			73,500,000	10,000,000
Loans obtained from financial institutions	35,615,614	704,715,468	841,991,767	378,971,078
Debt payments, principal only	(32,342,434)	(642,059,819)	(614,987,329)	(193,618,498)
Interest paid	(5,504,223)	(108,910,417)	(88,754,141)	(62,737,150)
Cash flows provided by financing activities:	(2,231,043)	(46,254,768)	211,750,297	132,615,430
Net (decrease) increase in cash and cash equivalents	(3,211,663)	(63,548,217)	37,359,366	(17,579,861)
Effects of foreign exchange on cash balances	(107,776)	(2,132,542)	16,804,267	8,960,213
Cash and cash equivalents at the beginning of the year	8,264,769	163,532,513	109,368,880	117,988,528
Cash and cash equivalents at the end of the year	$ 4,945,330	$ 97,851,754	$ 163,532,513	$ 109,368,880

Structure and Business Operatio

Structure and Business Operations of Petroleos Mexicanos, Subsidiary Entities and Subsidiary Companies	12 Months Ended
	Dec. 31, 2017
Text block1 [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 As part of the secondary legislation enacted in accordance with the Energy Reform Decree, on August 11, 2014, the Ley de Petróleos Mexicanos (the “Petróleos Mexicanos Law”) was published in the Official Gazette of the Federation. The Petróleos Mexicanos Law became effective on October 7, 2014, except for certain provisions. On December 2, 2014, the Secretaría de Energía (“Ministry of Energy”) published in the Official Gazette of the Federation the declaration pursuant to which the special regime governing Petróleos Mexicanos’ activities relating to productive state-owned subsidiaries, affiliates, compensation, assets, administrative liabilities, state dividend, budget and debt levels came into effect. On June 10, 2015 the Disposiciones Generales de Contratación para Petróleos Mexicanos y sus Empresas Productivas Subsidiarias (General Contracting Provisions for Petróleos Mexicanos and its productive state-owned subsidiaries) was published in the Official Gazette of the Federation and thereafter the special regime for acquisitions, leases, services and public works matters came into effect. 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 Mexico. In addition, Petróleos Mexicanos performs activities related to refining, gas processing and engineering and research projects to create economic value and to increase the income of the Mexican Government, as its owner, while adhering to principles of equity and social and environmental responsibility. The Subsidiary Entities, Pemex Exploración y Producción (Pemex Exploration and Production), Pemex Transformación Industrial (Pemex Industrial Transformation), Pemex Perforación y Servicios (Pemex Drilling and Services), Pemex Logística (Pemex Logistics), Pemex Cogeneración y Servicios (Pemex Cogeneration and Services), Pemex Fertilizantes (Pemex Fertilizers) and Pemex Etileno (Pemex Ethylene), are productive state-owned subsidiaries empowered to own property and carry on business in their own name, subject to the direction and coordination of Petróleos Mexicanos (the “Subsidiary Entities”). The Subsidiary Entities of Petróleos Mexicanos prior to the Corporate Reorganization (defined below) were Pemex-Exploración y Producción, Pemex-Refinación (Pemex-Refining), Pemex-Gas (Pemex-Gas The Board of Directors of Petróleos Mexicanos, in its meeting held on November 18, 2014, approved the Corporate Reorganization proposed by the Chief Executive Officer of Petróleos Mexicanos. Pursuant to the corporate reorganization, the existing four Subsidiary Entities were transformed into two new productive state-owned subsidiaries, which have assumed all of the rights and obligations of the existing Subsidiary Entities (the “Corporate Reorganization”). Pemex-Exploration and Production was transformed into Pemex Exploration and Production, a productive state-owned subsidiary, and Pemex-Refining, Pemex-Gas The Board of Directors of Petróleos Mexicanos also approved the creation of the following new Subsidiary Entities: Pemex Drilling and Services, Pemex Logistics, Pemex Cogeneration and Services, Pemex Fertilizers and Pemex Ethylene. Each of these productive state-owned subsidiaries may be transformed into an affiliate of Petróleos Mexicanos if certain conditions set forth in the Petróleos Mexicanos Law are met. On March 27, 2015, the Board of Directors of Petróleos Mexicanos approved the Estatuto Orgánico de Petróleos Mexicanos acuerdos de creación • 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. • Pemex Industrial Transformation: This entity performs activities related to refining, processing, importing, exporting, trading and the sale of hydrocarbons. • Pemex Drilling and Services: This entity performs drilling services and repair and services of wells. • 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. • Pemex Cogeneration and Services: This entity generates, supplies and trades electric and thermal energy, including but not limited to the energy and thermal power produced in power plants and cogeneration plants, as well as performing technical and management services related to these activities to PEMEX and other companies, by itself or through companies in which it participates directly or indirectly. • Pemex Fertilizers: This entity produces, distributes and commercializes ammonia, fertilizers and its derivatives, as well as provides related services. • Pemex Ethylene: This entity commercializes, distributes and trades methane, ethane and propylene, directly or through others. On April 28, 2015 the creation resolutions of the seven productive state-owned subsidiaries were published in the Official Gazette of the Federation. Each creation resolution included a provision establishing that the creation resolution would come into effect once the required administrative procedures to start operations were in place and the Board of Directors of Petróleos Mexicanos issued and published a statement related to each creation resolution in the Official Gazette of the Federation. On May 29, 2015 the statements related to the creation resolution of the productive state-owned subsidiary Pemex Exploration and Production and the productive state-owned subsidiary Pemex Cogeneration and Services issued by the Board of Directors of Petróleos Mexicanos were published in the Official Gazette of the Federation and, accordingly, these creation resolutions came into effect on June 1, 2015. On December 29, 2015 and May 12, 2016, modifications to the creation resolution of the productive state-owned subsidiary Pemex Exploration and Production were published in the Official Gazette of the Federation and became effective that same date, respectively. On July 31, 2015, the statements related to the creation resolution of the productive state-owned subsidiary Pemex Drilling and Services, the productive state-owned subsidiary Pemex Fertilizers and the productive state-owned subsidiary Pemex Ethylene issued by the Board of Directors of Petróleos Mexicanos were published in the Official Gazette of the Federation and, accordingly, these creation resolutions came into effect on August 1, 2015. On October 1, 2015, the statement related to the creation resolution of the productive state-owned subsidiary Pemex Logistics issued by the Board of Directors of Petróleos Mexicanos was published in the Official Gazette of the Federation and, accordingly, these creation resolutions came into effect on October 1, 2015. On October 6, 2015, the statement related to the creation resolution of the productive state-owned subsidiary Pemex Industrial Transformation issued by the Board of Directors of Petróleos Mexicanos was published in the Official Gazette of the Federation and, accordingly, these creation resolutions came into effect on November 1, 2015. As of the date of this report, all of the creation resolutions of the productive state-owned subsidiaries have come into effect. 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 (see Note 3 a). “Associates,” as used herein, means those companies in which Petróleos Mexicanos does not have effective control (see Note 3 a). 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, Delegación Miguel Hidalgo, 11300 Ciudad de México, México.

Basis of Preparation

Basis of Preparation	12 Months Ended
	Dec. 31, 2017
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Basis of Preparation	NOTE 2. BASIS OF PREPARATION a. Statement of compliance PEMEX prepared its consolidated financial statements as of December 31, 2017 and 2016, and for the years ended December 31, 2017, 2016 and 2015, in accordance with International Financial Reporting Standards (“IFRS”) as issued by the International Accounting Standards Board (“IASB”). On April 27, 2018, these consolidated financial statements under IFRS and the notes hereto were authorized for issuance by the following officers: Mr. Carlos Alberto Treviño Medina, Chief Executive Officer, Mr. David Ruelas Rodríguez, Chief Financial Officer, Mr. Manuel Salvador Cruz Flores, Deputy Director of Accounting and Tax Matters, and Mr. Oscar René Orozco Piliado, Associate Managing Director of Accounting. These consolidated financial statements and the notes hereto as of December 31, 2017 were approved by the Board of Petróleos Mexicanos on April 17, 2018 with prior approval from the Audit Committee of the report of the Independent Registered Public Accountant, 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 b. Basis of measurement and going concern These consolidated financial statements have been prepared using the historical cost basis method, except where it is indicated that certain items have been measured using the fair value model, amortized cost, present value or value in use. The principal items measured at fair value are derivative financial instruments (“DFIs”); the principal item measured at amortized cost is debt, the principal item measured at present value is the provision for employee benefits and some components of wells, pipelines, properties, plant and equipment are measured at value in use. Going concern The consolidated financial statements have been prepared on a going concern basis, which assumes that PEMEX can meet its payment obligations. For the years ended December 31, 2017 and 2016, PEMEX recognized a net loss of Ps. 280,850,619 and Ps. 191,144,342, respectively, caused mainly by sustained low international oil prices, the high tax burden applicable to the industry, the depreciation of the peso relative to the U.S. dollar and an impairment of non-financial PEMEX believes net cash flows from its operating and financing activities, including its availability of lines of credit with certain banks, will be sufficient to meet its working capital needs, debt service and capital expenditure requirements and maintain its financial strength and flexibility in the twelve months following the date of issuance of these consolidated financial statements. PEMEX continues to implement actions and business strategies that enable it to operate competitively and efficiently and take advantage of benefits of the Energy Reform Decree, as further described below: • 2017-2021 Business Plan: On November 3, 2016, PEMEX announced its business plan for the five-year period from 2017 through 2021, which is designed to improve cash flows, reduce net indebtedness, strengthen its financial balance, reduce financial losses in its national refining system and plan for continued cost-cutting and administrative discipline, as well as the establishment of additional strategic alliances and partnerships, including an intensive farm-out • Plan for 2017: The 2017 actions under the business plan established certain objectives with respect to its Subsidiary Entities that were implemented as follows: • Pemex Exploration and Production’s investments focused on the most profitable projects, as well as on farm-outs and other partnerships aimed at increasing hydrocarbon production. • On March 3, 2017, Pemex Exploration and Production signed the first farm-out BHP-Billiton • On May 2, 2017, Pemex Exploration and Production entered into an agreement with the Comisión Nacional de Hidrocarburos Ek-Balam • On May 30, 2017, Petróleos Mexicanos obtained approval from the NHC for the assignment of a new area that includes Chachiquin, located in the Cinturón Plegado Perdido region in the deep waters of the Gulf of Mexico south of the maritime border with the U.S., and an area southwest of the Nobilis field. • Similarly, on June 19, 2017, Pemex Exploration and Production was awarded exploration and production fields bidding process (“Rounds”) in Round 2.1 the rights to develop two blocks in shallow waters: Block 2, in partnership DEA Deutsche Erdoel Ag (“DEA”) and Block B in partnership with Ecopetrol Global Energy, S.L.U. (“Ecopetrol”). On September 25, 2017, Pemex Exploration and Production signed the corresponding contracts for the exploration and extraction of hydrocarbons with DEA and Ecopetrol. • On October 4, 2017, Pemex Exploration and Production finalized two farm-outs for the optimization of the development of the onshore fields of Cárdenas-Mora and Ogarrio, with Cheiron Holdings Limited (“Cheiron”) and DEA companies, respectively. • On November 3, 2017, Petróleos Mexicanos announced the discovery of onshore light crude oil and gas reservoirs at the Ixachi-1 Sistema Nacional de Gasoductos • On December 18, 2017, Pemex Exploration and Production and Petrofac México, S.A. de C.V., together with the NHC, signed the exploration and extraction contract for the onshore fields Santuario and El Golpe, which are located in the state of Tabasco. • Pemex Industrial Transformation worked in partnerships for auxiliary services and the reconfiguration of certain refineries. On September 1, 2017, Pemex Industrial Transformation executed the auxiliary services contract with Air Liquide México. S.A. de R.L. de C.V. for ensuring and efficient hydrogen supply for the Miguel Hidalgo Refinery in Tula, Hidalgo. • In September, 2017, Pemex Industrial Transformation began the selection process for partners for the hydrogen supply projects for the Héctor R. Lara Sosa Refinery in Cadereyta, Nuevo León and the Francisco I. Madero Refinery in Ciudad Madero, Tamaulipas. In April 2018, Pemex Industrial Transformation entered into a long-term agreement with the German company Linde AG for the supply of hydrogen to its Madero refinery. • Pemex Logistics is being transformed from a company designed to ensure that Petróleos Mexicanos and its subsidiaries are properly supplied to one that provides profitable and competitive services to multiple customers. On May 2, 2017, PEMEX announced the results of the first Open Season Public Auction held by Pemex Logistics whereby, on July 18, 2017, PEMEX signed the contracts with Andeavor (formerly Tesoro Corporation). Under the contracts, Andeavor may use PEMEX’s pipeline transportation and storage system in the northwest of Mexico. On December 18, 2017, the Comisión Reguladora de Energía (the Energy Regulatory Commission, or “ERC”) approved Phase 2 of the Open Season. • PEMEX’s business plan also describes its goal to increase the profitability of Pemex Fertilizers, Pemex Ethylene and Pemex Drilling and Services through service contracts and partnerships for the modernization of their facilities. On July 6, 2017, Pemex Ethylene, successfully concluded an e-auction • Plan for 2018: The 2018 actions under the business plan also set out certain objectives that PEMEX expects to achieve with respect to its Subsidiary Entities as follows: • On January 31, 2018, PEMEX successfully participated in bidding Round 2.4, and was awarded the assignment of four blocks, all of which are located in deep waters in the Gulf of Mexico. Pemex Exploration and Production and Royal Dutch Shell PLC (“Shell”) were awarded Block 2 of the Perdido area. The consortium formed by Pemex Exploration and Production, Chevron and INPEX was awarded area 22 of the Cuenca Salina province. Finally, PEMEX was assigned on an individual basis, Block 5 in the Perdido area and area 18 of the Mexican Range province. • On March 27, 2018, Petróleos Mexicanos successfully participated in bidding Round 3.1 of the NHC tenders, and was awarded seven contractual areas in shallow waters, six of them in a consortium and one on an individual basis. Pemex Exploration and Production won four blocks in the Southeast Basins: two in consortium with French Total S.A., one with Shell and one on an individual basis, as well as three blocks corresponding to the province of Tampico-Misantla-Veracruz: two in partnership with Compañía Española de Petróleos (“CEPSA”) and DEA and one more in partnership with CEPSA. These contracts are intended to contribute to increase the reserves and hydrocarbon production with the respective economic benefits. • Pemex Exploration and Production will focus on maintaining production levels and developing farm-outs and associations with the aim of increasing its operations and, with time, the production of hydrocarbons in the mid-term. • In order to continue to take advantage of the benefits of the Energy Reform and to ensure the economic sustainability of PEMEX, in 2018 and in the up-coming • Pemex Industrial Transformation will continue to perform reconfiguration and auxiliary services for its refineries and to focus on the following strategies: (1) keeping its facilities safe and reliable, (2) improving the financial balance, (3) maintaining a market share in Mexico of over 65%; and (4) eliminating debts, which will help to improve its refining margin. In addition to taking advantage of new business opportunities and arrangements provided by the Energy Reform, such as farm-outs, PEMEX also continues to take certain specific measures to improve its financial position, including the following: • 2016 Budget Adjustment: In 2017, PEMEX developed actions from its Plan de Ajuste Presupuestal 2016 (“2016 Budget Adjustment Plan”) to reduce expenses which were included in its 2017-2021 Business Plan. • Pension Reform. As of January 1, 2016, new employees are entitled to receive a defined contribution pension plan, pursuant to which both PEMEX and its employees contribute to each employee’s individual account, in contrast to the existing defined benefit pension plan, pursuant to which only PEMEX contributes. Additionally, in August 2017, PEMEX began the process of inviting existing employees to migrate from a defined benefit plan to a defined contribution plan, which will allow Pemex to decrease its employee benefits service cost and its employee benefits liability. • Asset Sales. PEMEX continues to evaluate the divestiture of non-essential • On October 5, 2017, PEMEX announced the divestiture of its participation in the Ramones II Norte gas pipeline (50% interest of Pemex Industrial Transformation in Ductos y Energéticos del Norte, S. de R.L. de C.V., and 5% indirect interest of Pemex Industrial Transformation TAG Norte Holding, S. de R.L. de C.V.). On November 10, 2017, the Comisión Federal de Competencia Económica (the Federal Commission for Financial Competence) authorized the divestiture in Ductos y Energéticos del Norte, S. de R.L. de C.V., closing the operation on November 16, 2017. PEMEX estimates that TAG Norte Holding, S. de R.L. de C.V. divestiture will conclude in the first semester of 2018. • Decreased Debt Financing: PEMEX decreased its financing during 2017 from Ps. 231,618,067 of net indebtedness in 2016 to a net indebtedness of Ps. 72,412,672 in 2017. In addition, PEMEX developed liability management transactions in accordance with market conditions and in order to improve its financial profile, with longer due dates and better interest rates, as described in Note 15 to these consolidated financial statements. As a result of this strategy, Standard & Poor’s and Fitch increased PEMEX’s ratings outlook from negative to stable. For the fiscal year of 2018, the Federal Income Law applicable to PEMEX authorized for Petróleos Mexicanos and its Subsidiary Entities an internal net debt up to Ps. 30,000,000 and an external net debt up to U.S.$ 6,182,800. In addition, PEMEX will continue to assess opportunities for liability management in accordance with market conditions. In addition, as of December 31, 2017, PEMEX has five syndicated lines of credit to manage its liquidity for U.S.$6,700,000 and Ps.23,500,000. • New Budget: On July 14, 2017, the Board of Directors of Petróleos Mexicanos approved a proposal for the annual consolidated budget of Petróleos Mexicanos and its Subsidiaries Entities for 2018, which was subsequently approved by the Chamber of Deputies on November 9, 2017. The consolidated annual budget of Petróleos Mexicanos and its Subsidiary Entities for 2018 is approximately Ps. 391,946,000, a 1.7% increase as compared to the Ps. 385,211,257 consolidated annual adjusted budget for 2017. • The structural changes arising from the Energy Reform, and the actions taken by management are aimed at ensuring the continuity of PEMEX’s operations, reducing costs, generating more revenue and operating more efficiently. • In 2017, PEMEX entered into a crude oil hedge program to partially protect its cash flows from decreases in the price of Mexican crude oil. Petróleos Mexicanos and its Subsidiary Entities are not subject to the Ley de Concursos Mercantiles (the Bankruptcy Law) and none of PEMEX’s existing financing agreements include any clause that could lead to the demand for immediate payment of the respective debt due to having negative equity. PEMEX prepared its consolidated financial statements as of December 31, 2017 and 2016 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. c. Functional and reporting currency and translation of foreign currency operations These consolidated financial statements are presented in Mexican pesos, which is both PEMEX’s functional 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. Petróleos Mexicanos and its Subsidiary Entities have budgetary autonomy, subject only to maintaining the financial balance (the difference between income and total net spending, including the financial cost of the public debt of the Mexican Government and the entities directly controlled by the Mexican Government) and the spending cap of personnel services proposed by SHCP and approved by the Mexican Congress, in Mexican pesos. iii. Employee benefits provision was approximately 35% and 34% of PEMEX’s total liabilities as of December 31, 2017 and 2016, 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 several 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, requires that Mexican Government entities other than financial entities sell their foreign currency to the Banco de México in accordance with its terms, receiving Mexican pesos in exchange, which is the currency of legal tender in Mexico. Translation of financial statements of foreign operations 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 d. Terms definition References in these consolidated financial statements and the related notes to “pesos” or “Ps.” refers to Mexican pesos, “U.S. dollars” or “US$” 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, “Swiss francs” or “CHF” refers to the legal currency of the Swiss Confederation, “Canadian dollars” or “CAD” refers to the legal currency of Canada and “Australian dollars” or “AUD” refers to the legal currency of Australia. Figures in all currencies are presented in thousands of the relevant currency unit, except exchange rates and product and share prices. e. 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 Banco de México and SHCP at December 31, 2017 of Ps. 19.7867 per U.S. dollar. Translations herein should not be construed as a representation that the peso amounts have been or could be converted into U.S. dollars at the foregoing or any other rate.

Significant Accounting Policies

Significant Accounting Policies	12 Months Ended
	Dec. 31, 2017
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Significant Accounting Policies	NOTE 3. Significant accounting policies 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. 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: • Note 3(e) Financial instruments—determination of fair values • Note 3(h) Wells, pipelines, properties, plant and equipment, including the successful efforts method—economic feasibility determining to capitalize assets • Note 3(j) Impairment of non-financial • Note 3(l) Provisions—environmental liabilities and retirement of assets • Note 3(m) Employee benefits—actuarial assumptions and hypothesis • Note 3(n) Income taxes and duties—assessment of deferred income tax asset recovery • Note 3(p) Contingencies—assessment of likelihood of contingency Actual results could differ from those estimates and assumptions. Below is a summary of the principal accounting policies, which have been consistently applied to each of the years presented and followed by PEMEX in the preparation of its consolidated financial statements: a. Basis of consolidation The consolidated financial statements include those of Petróleos Mexicanos, the Subsidiary Entities and the Subsidiary Companies. All intercompany balances and transactions of the consolidated companies; income and expenses, as well as unrealized profits and losses resulting from operations between them have been eliminated in the preparation of the consolidated financial statements pursuant to IFRS 10, “Consolidated Financial Statements” (“IFRS 10”). Unrealized gains arising from transactions with entities whose investment is accounted for using the equity method are eliminated against the investment to the extent of PEMEX’s participation in such entities. Unrealized losses are eliminated in the same way as unrealized gains but only to the extent that there is no evidence of impairment of the investment. If such evidence exists, PEMEX recognizes it in its consolidated financial statements. Investment in subsidiaries The Subsidiary Entities and Subsidiary Companies are consolidated from the date that control commences until the date that control ceases. Petróleos Mexicanos controls a subsidiary when it is exposed to or has rights to variable returns from the company and has the ability to affect those returns through its power over the company. The financial statements of the Subsidiary Entities and Subsidiary Companies have been prepared based on the same period of Petróleos Mexicanos’ consolidated financial statements applying the same accounting policies. For more information about Subsidiary Companies, see Note 4. Investments in associates and joint arrangements Associates are those entities in which PEMEX has significant influence but not the power to control financial and operational decisions. It is presumed that there is significant influence when PEMEX owns directly or indirectly between 20% and 50% of voting rights in another entity. Joint arrangements are those arrangements whereby two or more parties have joint control of an arrangement. A joint arrangement is either a joint venture, where both of the parties have rights to the net assets of the arrangements, or a joint operation, where the parties have both rights to the assets, and obligations for the liabilities relating to the arrangements. Investments in associates and joint ventures are recognized based on the equity method and recorded initially at cost, including any goodwill identified on acquisition. With respect to joint operations, the assets, liabilities, income and expenses are recognized in relation to the share of each party and in accordance with the applicable IFRS for each of those items. The investment cost includes transaction costs. These consolidated financial statements include the proportion of gains, losses and other comprehensive income corresponding to PEMEX’s share in each investee, once these items are adjusted to align with the accounting policies of PEMEX, from the date that significant influence and joint control begins to the date that such 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 associates and joint arrangements, see Note 11. Non-controlling The equity interests of third parties who do not have a controlling interest in the equity or comprehensive result of subsidiaries of PEMEX are presented in the consolidated statements of financial position, the consolidated statements of changes in equity (deficit) as “non-controlling non-controlling Changes in a parent’s ownership interest in a subsidiary that do not result in a loss of control are accounted for as equity transactions. In such circumstances, the carrying amounts of the controlling and non-controlling Dividends in cash and assets other than cash A liability for distributions of dividends in cash and non-cash Distributions of dividends in non-cash When distributing non-cash b. Business combinations and goodwill Business combinations are accounted for using the acquisition method. The cost of an acquisition is measured as the aggregate of the consideration transferred, measured as the acquisition date fair value, and the amount of any non-controlling When PEMEX acquires a business, it assesses the acquired assets and liabilities in order to appropriately classify and designate each, taking into account the contractual terms, economic circumstances and other pertinent conditions as of the date of the acquisition. This includes the separation of embedded derivatives in host contractors by the acquiree. Acquired petroleum reserves and resources that can be reliably measured are recognized separately in the assessment of fair values on acquisition. Other potential reserves and rights, for which fair values cannot be reliably measured, are not recognized separately, but instead are subsumed in goodwill. For business combinations achieved in stages, any previously held equity interest is measured at its acquisition date fair value, and any resulting gain or loss is recognized in income or loss or other comprehensive income. Any contingent consideration to be transferred by the acquirer will be recognized at fair value on the acquisition date. Contingent consideration classified as an asset or liability that is a financial instrument and within the scope of IAS 39 “Financial instruments: Recognition and Measurement” is measured at fair value, with changes in fair value recognized in income or loss or other comprehensive income. If contingent consideration is not with the scope of IAS 39, it is measured in accordance with the appropriate IFRS requirement. Contingent consideration that is classified as equity is not remeasured, and subsequent settlement is accounted for within equity. Goodwill, which is initially measured at cost, is the excess of the aggregate of the consideration transferred and the amount recognized for non-controlling After initial recognition, goodwill is measured at cost less any accumulated impairment losses. For the purpose of impairment testing, goodwill acquired in a business combination is, from the acquisition date, allocated to each cash generating unit that is expected to benefit from the combination, irrespective of whether other assets or liabilities of the acquiree are assigned to those units. When goodwill is allocated to a cash generating unit and certain of the operations in that unit are disposed of, the goodwill associated with the disposed operation is included in the carrying amount of the operation when determining the gain or loss on disposal. Goodwill disposed in these circumstances is measured based on the relative values of the disposed operation and the portion of the cash generating unit retained. c. Transactions in foreign currency In accordance with IAS 21, “The Effects of Changes in Foreign Exchange Rates” (“IAS 21”), transactions in foreign currencies are translated and recorded at exchange rates at the dates of the transactions and/or of the presentation of financial information. Exchange differences arising from the settlement of monetary items or from the translation of monetary items into rates different from those at which they were translated on their initial recognition, are recognized in the results of operations in the reporting period in which they arise. When a gain or loss from a non-monetary non-monetary d. Fair value measurement PEMEX measures certain financial instruments such as DFIs at fair value as of the closing date of the relevant reporting period. 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. A measurement at fair value assumes that the sale of the asset or transfer of a liability occurs: i. in the principal market for the asset or liability; or ii. in the absence of a principal market, in the most advantageous market for the asset or liability. The principal market or the most advantageous market must be accessible for PEMEX. The fair value of an asset or liability is measured by using the same assumptions that market participants would make when pricing the asset or liability under the premise that market participants take into account highest and best use of the asset or liability. e. Financial instruments Financial instruments are classified as: (i) financial instruments measured at fair value through profit or loss; (ii) financial instruments held to maturity; (iii) available-for-sale PEMEX’s financial instruments include cash and short-term deposits, available-for-sale Below are descriptions of the financial instruments policies employed by PEMEX: Financial instruments measured at fair value through profit or loss A financial instrument is measured at fair value through profit or loss if it is classified as held for trading or designated as such upon initial recognition. Financial assets are designated at fair value through profit or loss if PEMEX manages such investments and makes purchase and sale decisions based on their fair value in accordance with PEMEX’s documented risk management or investment strategy. In addition, directly attributable transaction costs are recognized in the consolidated statements of comprehensive income for the year. These financial instruments are recognized at fair value and corresponding changes relating to dividend income are recognized in the consolidated statements of comprehensive income. Available-for-sale Available-for-sale non-DFIs available-for-sale available-for-sale Available-for-sale Subsequent to initial recognition, available-for-sale Sales and purchases of financial assets that require the delivery of such assets within a period of time established by market practice are recognized as of the negotiation date (the date on which PEMEX commits to purchase or sell the asset). Loans and receivables Loans and receivables are initially recognized at fair value. After initial recognition, loans and debt securities that bear interest are measured at amortized cost using the effective interest rate (“EIR”) method, less impairment losses. The amortized cost is calculated based on any discount or premium on acquisition and fees and costs that are an integral part of the EIR method. Amortization of costs is included under the heading of financing cost in the consolidated statements of comprehensive income. Derivative financial instruments DFIs presented in the consolidated statements of financial position are carried at fair value. In the case of DFIs held for trading, changes in fair value are recorded in profit or loss; in the case of DFIs formally designated as and that qualify for hedging, changes in fair value are recorded in the consolidated statements of comprehensive income using cash flow or fair value hedge accounting, with gains or losses classified in accordance with the earnings treatment of the hedge transaction. Embedded derivatives PEMEX evaluates the potential existence of embedded derivatives, which may be found in the terms of its contracts, or combined with other host contracts, which could be structured financial instruments (debt or equity instruments with embedded derivatives). Embedded derivatives have terms that implicitly or explicitly meet the characteristics of a DFI. In some instances, these embedded derivatives must be segregated from the underlying contracts and measured, recognized, presented and disclosed as DFIs, such as when the economic risks and terms of the embedded derivative are not clearly and closely related to the underlying contract. Impairment of financial assets At each reporting date, PEMEX evaluates whether there is objective evidence that a financial asset or group of financial assets is impaired, in which case the value of the recoverable amount of the asset is calculated. A financial asset is impaired if objective evidence indicates that a loss event has occurred after the initial recognition of the asset, and that the loss event had a negative effect on the estimated future cash flows of the financial asset. Objective evidence that a financial asset or group of assets is impaired includes significant financial difficulty of the issuer or obligor, a breach of contract, such as a default or delinquency in interest or principal payments; the lender, for economic or legal reasons relating to the borrower’s financial difficulty, granting to the borrower a concession that the lender would not otherwise consider; it becoming probable that the borrower will enter bankruptcy or other financial reorganization; the disappearance of an active market for that financial asset because of financial difficulties; or observable data indicating that there is a measurable decrease in the estimated future cash flows. Impairments by asset are: Impairment of financial assets carried at amortized cost The impairment of financial assets carried at amortized cost is measured as the difference between the assets carrying amount and the present value of estimated future cash flows (excluding future credit losses that have not been incurred) discounted at the financial asset’s original effective interest rate. The amount of the loss shall be recognized in profit or loss. If, in a subsequent period, the amount of the impairment loss decreases and the decrease can be related objectively to an event occurring after the impairment was recognized, the impairment loss previously recognized shall be reversed in profit or loss. Impairment in available—for—sale financial assets In addition to the above-mentioned, a significant or prolonged decline in the fair value of an investment in an available—for—sale equity instrument is also objective evidence of impairment. When there is objective evidence of the impairment of an asset, the accumulated loss recognized in other comprehensive income shall be reclassified from equity to profit or loss even though the financial asset has not been derecognized. If, in a subsequent period, the impairment loss decreases, the reversal shall be reflected as a reversal in other comprehensive income. f. Cash and cash equivalents Cash and cash equivalents are comprised of cash balances on hand, net of overdrafts, deposits in bank accounts, foreign currency reserves and instruments with maturities of three months or less from the acquisition date that are subject to an insignificant risk of changes in their fair value, which are used in the management of PEMEX’s short-term commitments. Cash subject to restrictions or that cannot be exchanged or used to settle a liability within 12 months is presented as non-current g. 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 formula. 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. h. Wells, pipelines, properties, plant and equipment Wells, pipelines, properties, plant and equipment are recorded at acquisition or construction cost less accumulated depreciation and accumulated impairment losses. PEMEX uses the successful efforts method for the exploration and production of crude oil and gas activities, considering the criteria mentioned in IFRS 6, “Exploration for and Evaluation of Mineral Resources” in relation to the recognition of exploration and drilling assets. Costs of development wells and related plant, property and equipment involved in the exploitation of oil and gas are recorded as part of the cost of assets. The costs of exploratory wells in areas that have not yet been designated as containing proved reserves are recorded as intangible assets until it is determined whether they are commercially viable to capitalize as fixed assets, otherwise they are recognized as exploration expenses. Other expenditures on exploration are recognized as exploration expenses as they are incurred. In accordance with IAS 16, “Property, Plant and Equipment” (“IAS 16”), 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 the cost of plugging of wells and removal. 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. 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. 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. When parts of an item of wells, pipelines, properties and equipment are significant relative to the total cost of the item, the part is depreciated separately. Estimated useful lives of items of properties, plant and equipment are reviewed if expectations differ from previous estimates. Pipelines, properties, and equipment received from customers are initially recognized at fair value as revenue from ordinary operating activities if PEMEX has no future obligations to the customer who transferred the item. In contrast, if PEMEX does have future obligations to such a customer, the initial recognition is recorded as a deferred liability based on the period in which the assets will provide services to the customers. The capitalized value of finance leases is also included in the line item of wells, pipelines, properties, plant and equipment. Properties, plant and equipment acquired through financial leases are depreciated over the shorter of the lease term or the useful life of the asset. 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. i. 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. j. 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 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 statement of comprehensive income. k. Leases The determination of whether an agreement is or contains a lease is based on the economic substance of the agreement at the date of execution. An agreement contains a lease if performance under the agreement depends upon the use of a specific asset or assets, or if the agreement grants the right to use the asset. Finance leases, which transfer to PEMEX substantially all the inherent benefits and risks of the leased property, are capitalized at the date the lease commences, and the value is recorded as the lower of the fair value of the leased property and the present value of the minimum lease payments. Payments on the lease are divided between the financial costs and the amortization of the remaining debt principal in order to achieve a constant effective interest rate for the outstanding liability. The financing costs are recognized in the statement of comprehensive income. Operating lease payments are recognized as expenses in the statement of comprehensive income on a straight line basis over the term of the lease and variable rent payments are recognized in the operating results on an accrued basis. l. Provisions 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 m. Employee benefits Beginning January 1, 2016, Petróleos Mexicanos and the Subsidiary Entities have operated both a defined contribution plan and a defined benefit pension plan. Until December 31, 2015, PEMEX only operated a defined benefit pension plan. Defined contribution pension plan In this plan, both Petróleos Mexicanos and the Subsidiary Entities and their respective employees contribute to the worker’s individual account. PEMEX’s contributions are recognized on an accrual basis as cost, expense or asset, and are credited to liability. Contributions to the defined contribution plan that are not expected to be fully settled within 12 months after the end of the annual reporting period in which the employee rendered related services will be discounted using the defined benefit plan discount rate. Defined benefit plan Under the defined benefit plan, Petróleos Mexicanos and the Subsidiary Entities are the only parties that contribute to a trust, which is managed separately. Petróleos Mexicanos and the Subsidiary Entities recognize the cost for defined benefit plans based on independent actuarial computations applying the projected unit credit method. Actuarial gains and losses are recognized within other comprehensive results for the period in which they are determined. The costs of prior services are recognized within profit or loss for the period in which they are determined. The asset or liability in the defined benefit plan comprises the present value of the defined benefit obligation less the fair value of plan assets for which obligations have to be settled. The value of any asset is limited to the present value of any economic benefit represented by the plan reimbursements or reductions of the future contributions to the plan. In addition, other long term employee benefits include the seniority premiums payable for disability, death and survivors benefits, medical services, gas and basic food basket for beneficiaries. Termination benefits are recognized in profit or loss for the year in which they are incurred. n. Income taxes and duties Current income tax Current income tax assets or liabilities for the current and prior years are measured as the amount expected to be paid or to be recovered from the tax authorities, using either the tax rates in force or tax rates which are in the process of being approved and are substantially completed by the end of the year. Current income taxes related with items that are recognized as equity are presented in the other comprehensive income of the year. Periodically, PEMEX evaluates the positions taken in its tax returns for those regulations that are subject to interpretation and books corresponding provisions, if it is deemed necessary. Deferred income taxes Deferred taxes are recorded based on the assets and liabilities method, which consists of the recognition of deferred taxes by applying tax rates applicable to the income tax to the temporary differences between the carrying value and tax values of assets and liabilities at the date of these consolidated financial statements. Deferred tax liabilities are recognized for all taxable temporary differences, except to the extent that the deferred tax liability arises from: • the initial recognition of goodwill or the initial recognition of an asset or liability in a transaction which is not a business combination and at the time of the transaction, affects neither accounting profit nor taxable profit or tax loss; and • taxable temporary differences associated with investments in subsidiaries, branches and associates, and interest in joint arrangements, when the pa

Subsidiary Entities and Subsidi

Subsidiary Entities and Subsidiary Companies	12 Months Ended
	Dec. 31, 2017
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Subsidiary Entities and Subsidiary Companies	NOTE 4. SUBSIDIARY ENTITIES AND SUBSIDIARY COMPANIES As of December 31, 2017, the Subsidiary Entities consolidated in these financial statements include Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Cogeneration and Services, Pemex Drilling and Services, Pemex Logistics, Pemex Fertilizers and Pemex Ethylene. The consolidated Subsidiary Companies are as follows: • P.M.I. Marine, DAC. (PMI Mar) (i) • P.M.I. Services, B.V. (PMI SHO) (i) • P.M.I. Holdings, B.V. (PMI HBV) (i)(x) • P.M.I. Trading, Ltd. (PMI Trading) (i) • PEMEX Internacional España, S. A. (PMI SES) (i)(viii) • P.M.I. Holdings Petróleos España, S. L. (HPE) (i) • P.M.I. Services North America, Inc. (PMI SUS) (i) • P.M.I. Holdings North America, Inc. (PMI HNA) (i)(ix) • P.M.I. Norteamérica, S. A. de C. V. (PMI NASA) (i) • P.M.I. Comercio Internacional, S. A. de C. V. (PMI CIM) (i)(ii) • PMI Field Management Resources, S. L. (FMR) (i)(xi) • PMI Campos Maduros SANMA, S. de R. L. de C. V. (SANMA) (i) • Pro-Agroindustria, • PMI Azufre Industrial, S. A. de C. V. (PMI AZIND) (i) • PMI Infraestructura de Desarrollo, S. A. de C. V. (PMI ID) (i) • PMI Cinturón Transoceánico Gas Natural, S. A. de C. V. (PMI CT) (i) • PMI Transoceánico Gas LP, S. A. de C. V. (PMI TG) (i) • PMI Servicios Portuarios Transoceánicos, S. A. de C. V. (PMI SP) • PMI Midstream del Centro, S. A. de C. V. (PMI MC) (i) • PEMEX Procurement International, Inc. (PPI) • Hijos de J. Barreras, S. A. (HJ BARRERAS) (ii) • PEMEX Finance, Ltd. (FIN) (ii) • Mex Gas Internacional, S. L. (MGAS) • Pemex Desarrollo e Inversión Inmobiliaria, S. A. de C. V. (PDII) • Kot Insurance Company, AG. (KOT) • PPQ Cadena Productiva, S.L. (PPQCP) • III Servicios, S. A. de C. V. (III Servicios) • PMI Ducto de Juárez, S. de R.L. de C.V. (PMI DJ) (i)(iii) • PMX Cogeneración Internacional, S.L. (MG COG) (iv)(vi)(xii) • PMX Cogeneración S.A.P.I. de C.V. (PMX COG) (iv) (xii) • PMX Fertilizantes Holding, S.A de C.V. (PMX FH) (iv) • PMX Fertilizantes Pacífico, S.A. de C.V. (PMX FP) (iv) • Grupo Fertinal (GP FER) (iv) • Compañía Mexicana de Exploraciones, S.A. de C.V. (COMESA) (v) • P.M.I Trading Mexico, S.A. de C.V. (TRDMX) (vii) • Holdings Holanda Services, B.V. (HHS) (x) i. Member Company of the “PMI Subsidiaries”. ii. Non-controlling iii. As of January 2016, this company started operations and was included in the consolidated financial statements of PEMEX. iv. As of June 2016, this company was included in the consolidated financial statements of PEMEX. v. As of July 2016, this company was included in the consolidated financial statements of PEMEX. vi. Until October 2016, formerly Mex Gas Cogeneración S.L. vii. As of January 2017, this company started operations and was included in the consolidated financial statements of PEMEX viii. As of February 2017, this company merged with HPE. ix. As of June 2017, this company merged with SUS. x. As of October 2017, PMI HBV was divided and HHS was created and included in the consolidated financial statements of PEMEX. xi. This Company was liquidated. xii. As of December 2017, PEMEX acquired shares in these companies and they were included in the consolidated financial statements of PEMEX.

Segment financial information

Segment financial information	12 Months Ended
	Dec. 31, 2017
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Segment financial information	NOTE 5. 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. After the Corporate Reorganization, PEMEX’s operations have been conducted through nine business segments: exploration and production, industrial transformation, cogeneration and services, drilling and services, logistics, ethylene, fertilizers, the Trading Companies and corporate and other operating subsidiary companies. Due to PEMEX’s structure, there are significant quantities of inter-segment sales among the reporting segments, which are made at internal transfer prices established by PEMEX reflecting international 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. Export sales are made through PMI CIM to approximately 32 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 (Federal Electricity Commission, or “CFE”) and a significant portion of jet fuel produced to Aeropuertos y Servicios Auxiliares (the Airports and Auxiliary Services Agency). The refining segment’s most important products are different types of gasoline and diesel. • 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 cogeneration segment receives income from the cogeneration, supply and sale of electricity and thermal energy and also provides technical and management activities associated with these services. • The drilling segment receives income from drilling services, and servicing and repairing wells. • 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 ethylene segment earns revenues from the distribution and trade of methane, ethane and propylene in the domestic market. • The fertilizers segment earns revenues from trading ammonia, fertilizers and its derivatives, mostly in the domestic market. • The trading companies segment, which consist of PMI CIM, PMI NASA, PMI Trading and MGAS (the “Trading Companies”), earn revenues from trading crude oil, natural gas and petroleum and petrochemical products in international markets. • The segment related to corporate and other operating Subsidiary Companies provides administrative, financing, consulting and logistical services, as well as economic, tax and legal advice and re-insurance The following tables present the condensed financial information of these segments, after elimination of unrealized intersegment gain (loss), and include only select line items. 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. As of/for the year ended December 31, 2017 Exploration Production Industrial Cogeneration (1) Drilling and Logistics Fertilizers Ethylene Trading Corporate and Intersegment Total Sales: Trade Ps. — Ps. 857,456,146 Ps. — Ps. — Ps. — Ps. 4,123,006 Ps. 12,621,648 Ps. 508,539,112 Ps. 3,159,238 Ps. — Ps. 1,385,899,150 Intersegment 762,637,362 150,360,283 114,233 3,400,456 70,671,871 642,965 1,565,757 539,193,190 79,031,944 (1,607,618,061 ) — Services income — 6,116,937 334,755 41,741 3,714,941 2,339 26,733 66,621 826,502 — 11,130,569 (Reversal) impairment of wells pipelines, properties, plant and equipment, net 129,350,315 15,952,092 — — — 1,935,500 — — 4,206,653 — 151,444,560 Cost of sales 391,089,410 1,004,683,554 472,732 468,171 50,926,263 6,001,259 14,272,340 1,031,997,901 33,033,923 (1,528,740,673 ) 1,004,204,880 Gross income (loss) 242,197,637 (6,702,280 ) (23,744 ) 2,974,026 23,460,549 (3,168,449 ) (58,202 ) 15,801,022 45,777,108 (78,877,388 ) 241,380,279 Other revenues (expenses), net 10,204,045 1,515,538 2,646 (31,454 ) (24,134,436 ) 9,013 23,030 307,212 (5,344,872 ) 22,623,354 5,174,076 Distribution, transportation and sales expenses — 26,049,566 13,581 — 73,526 528,370 334,663 375,482 59,043 (5,544,561 ) 21,889,670 Administrative expenses 58,539,119 38,994,887 37,679 888,776 7,459,928 352,537 1,105,554 1,564,859 62,001,641 (51,005,526 ) 119,939,454 Operating income (loss) 193,862,563 (70,231,195 ) (72,358 ) 2,053,796 (8,207,341 ) (4,040,343 ) (1,475,389 ) 14,167,893 (21,628,448 ) 296,053 104,725,231 Financing income 121,293,404 11,427,907 147 57,313 1,622,827 2,248 46,113 905,405 145,907,795 (265,097,306 ) 16,165,853 Financing cost (136,378,338 ) (2,398,643 ) (19,882 ) (795,947 ) (2,307,427 ) (211,004 ) (1,964 ) (1,328,827 ) (239,003,771 ) 264,801,255 (117,644,548 ) Derivative financial instruments (cost) income, net (1,613,874 ) 5,835 — — — — — (772,143 ) 27,718,506 — 25,338,324 Foreign exchange (loss) income, net 10,043,316 4,924,209 — 227,365 613,099 (20,925 ) (10,486 ) (4,318 ) 7,411,862 — 23,184,122 Profit (loss) sharing in joint ventures and associates (75,195 ) 485,224 — — (74 ) — — 1,049,809 (212,666,494 ) 211,567,170 360,440 Taxes, duties and other 338,169,260 — — 276,967 (7,444,967 ) — — 1,972,718 6,063 — 332,980,041 Net (loss) income (151,037,384 ) (55,786,663 ) (92,093 ) 1,265,560 (833,949 ) (4,270,024 ) (1,441,726 ) 12,045,101 (292,266,613 ) 211,567,172 (280,850,619 ) Total current assets 1,036,063,541 570,380,888 179,807 6,871,148 49,391,784 3,155,476 3,994,381 158,414,445 506,187,594 (1,971,112,774 ) 363,526,290 Investments in joint ventures and associates 64,328 4 — — 18,336 — — 15,805,506 (465,026,224 ) 465,845,414 16,707,364 Wells, pipelines, properties, plant and equipment, net 945,945,889 286,423,735 — 18,956,882 119,647,553 5,713,998 19,008,822 6,739,231 34,073,216 — 1,436,509,326 Total assets 2,058,036,405 857,196,306 179,807 26,220,748 191,895,993 8,923,456 23,142,045 186,808,899 2,111,740,735 (3,332,142,280 ) 2,132,002,114 Total current liabilities 284,656,058 459,130,165 531,580 2,201,936 44,521,371 6,455,246 2,183,654 112,046,527 1,439,097,882 (1,961,697,234 ) 389,127,185 Long-term debt 1,826,843,268 25,437,147 — 11,258,734 2,814,640 — — 2,712,654 1,837,690,559 (1,826,091,398 ) 1,880,665,604 Employee benefits 372,032,958 588,573,518 — 333,212 1,842,892 98,361 105,033 (966,238 ) 296,416,386 — 1,258,436,122 Total liabilities 2,570,412,398 1,077,108,748 531,580 13,886,424 56,706,251 6,556,050 2,308,890 116,842,881 3,587,988,972 (3,797,987,695 ) 3,634,354,499 Equity (deficit), net (512,375,993 ) (219,912,442 ) (351,773 ) 12,334,324 135,189,742 2,367,406 20,833,155 69,966,018 (1,476,248,237 ) 465,845,415 (1,502,352,385 ) Depreciation and amortization 127,742,568 17,935,112 — 2,368,123 4,562,140 422,930 1,688,493 (19,798 ) 2,004,945 — 156,704,513 Net periodic cost of employee benefits 32,794,386 52,538,989 — 39,697 (4,954 ) (1,999 ) (12,561 ) 16,166 22,703,351 — 108,073,075 Acquisition of wells, pipelines, properties, plant and equipment 67,845,989 14,678,182 — 418,283 5,189,409 219,152 475,196 321,145 4,832,461 — 93,979,817 (1) Certain of the assets of Pemex Cogeneration and Services have been transferred to Pemex Industrial Transformation. As of/for the year ended December 31, 2016 Exploration Production Industrial Cogeneration Drilling and Logistics Fertilizers Ethylene Trading Corporate and Intersegment Total Sales: Trade Ps. — Ps. 648,088,013 Ps. — Ps. — Ps. — Ps. 3,873,403 Ps. 15,392,552 Ps. 395,118,117 Ps. 2,646,505 Ps. — Ps. 1,065,118,590 Intersegment 616,380,615 117,096,378 51,913 1,981,754 68,316,958 900,464 1,764,438 405,293,283 50,683,175 (1,262,468,978 ) — Services income — 5,565,604 132,521 70,112 2,813,887 1,908 60,141 236,230 473,415 (379,176 ) 8,974,642 (Reversal) impairment of wells pipelines, properties, plant and equipment, net (271,709,433 ) (52,498,881 ) — — (5,829,520 ) — (1,276,509 ) — — — (331,314,343 ) Cost of sales 359,064,884 823,763,927 166,721 143,956 61,248,584 5,506,198 13,936,213 783,691,245 7,260,043 (1,188,959,550 ) 865,822,221 Gross income (loss) 529,025,164 (515,051 ) 17,713 1,907,910 15,711,781 (730,423 ) 4,557,427 16,956,385 46,543,052 (73,888,604 ) 539,585,354 Other revenues (expenses), net 27,346,794 19,964,654 — 591,704 (27,189,969 ) 32,710 63,989 3,412,711 (906,183 ) (666,804 ) 22,649,606 Distribution, transportation and sales expenses — 50,792,317 8,232 6 148,215 185,168 481,727 229,432 49,162 (26,663,019 ) 25,231,240 Administrative expenses 54,509,047 34,183,846 32,126 983,560 7,175,451 731,479 2,101,834 1,157,182 60,497,232 (48,718,224 ) 112,653,533 Operating income (loss) 501,862,911 (65,526,560 ) (22,645 ) 1,516,048 (18,801,854 ) (1,614,360 ) 2,037,855 18,982,482 (14,909,525 ) 825,835 424,350,187 Financing income 56,040,129 11,056,345 — 72,995 373,301 4,358 64,582 1,098,079 125,964,466 (180,925,000 ) 13,749,255 Financing cost (109,946,363 ) (3,188,892 ) (12,055 ) (642,711 ) (481,741 ) (20,217 ) (2,980 ) (1,342,351 ) (163,400,779 ) 180,193,625 (98,844,464 ) Derivative financial instruments (cost) income, net — 3,172 — — — — — (1,951,959 ) (12,052,200 ) — (14,000,987 ) Foreign exchange (loss) income, net (217,166,718 ) (12,858,875 ) — (1,570,317 ) (1,118,537 ) (29,263 ) (2,843 ) 174,866 (21,441,056 ) — (254,012,743 ) Profit (loss) sharing in joint ventures and associates (21,164 ) 649,520 — — — — — 1,586,503 (117,426,818 ) 117,347,804 2,135,845 Taxes, duties and other 276,647,448 — — (481,581 ) (10,010,686 ) — — 7,380,870 (9,014,616 ) — 264,521,435 Net (loss) income (45,878,653 ) (69,865,290 ) (34,700 ) (142,404 ) (10,018,145 ) (1,659,482 ) 2,096,614 11,166,750 (194,251,296 ) 117,442,264 (191,144,342 ) Total current assets 983,260,710 795,237,287 388,422 6,032,213 22,087,801 1,724,967 5,817,262 125,081,531 613,881,578 (2,195,695,848 ) 357,815,923 Investments in joint ventures and associates 139,523 257,159 — — — — — 17,568,893 (247,349,711 ) 250,121,645 20,737,509 Wells, pipelines, properties, plant and equipment, net 1,176,504,263 311,432,174 — 21,023,629 86,695,514 7,771,634 20,086,650 6,691,813 37,536,571 — 1,667,742,248 Total assets 2,206,418,541 1,107,094,580 388,423 27,673,598 130,824,921 9,556,469 26,007,319 155,376,864 2,359,024,145 (3,692,478,836 ) 2,329,886,024 Total current liabilities 340,011,451 666,467,674 472,236 3,894,121 19,824,792 2,995,088 3,879,828 78,894,485 1,497,612,971 (2,187,862,760 ) 426,189,886 Long-term debt 1,737,109,328 31,495,027 — 12,489,423 4,382,109 — — 3,597,938 1,757,315,685 (1,739,384,968 ) 1,807,004,542 Employee benefits 362,312,386 575,277,374 191,876 441,127 571,702 20,362 21,893 (749,034 ) 282,321,750 — 1,220,409,436 Total liabilities 2,533,221,665 1,278,138,290 664,829 16,853,202 29,336,417 3,015,450 3,901,722 86,885,889 3,553,477,189 (3,942,600,482 ) 3,562,894,171 Equity (deficit), net (326,803,124 ) (171,043,710 ) (276,406 ) 10,820,396 101,488,504 6,541,019 22,105,597 68,490,975 (1,194,453,044 ) 250,121,646 (1,233,008,147 ) Depreciation and amortization 124,329,921 17,425,472 — 2,559,357 2,230,557 481,241 1,395,232 86,707 1,931,004 — 150,439,491 Net periodic cost of employee benefits 32,617,215 52,886,397 5,860 31,491 30,340 (1,178 ) 1,424 (552,735 ) 24,719,602 — 109,738,416 Acquisition of wells, pipelines, properties, plant and equipment 70,418,370 32,254,531 — 2,053,139 26,344,495 889,420 1,724,690 1,019,484 21,031,214 — 155,735,343 As of/for the year ended December 31, 2015 Exploration Production Industrial Cogeneration Drilling and Logistics Fertilizers Ethylene Trading Corporate and Intersegment Total Sales: Trade Ps. — Ps. 740,190,020 Ps. — Ps. — Ps. — Ps. 1,494,478 Ps. 4,551,413 Ps. 407,214,446 Ps. — Ps. — Ps. 1,153,450,357 Intersegment 690,642,133 126,294,195 — 1,511,970 598,853 209,970 473,990 353,137,149 18,296,515 (1,191,164,775 ) — Services income — 7,549,061 — — 10,355,988 236 17,893 661,683 505,032 (10,779,858 ) 8,310,035 Impairment of wells, pipelines, properties, plant and equipment 394,396,580 76,442,079 — — 5,829,519 — 1,276,512 — — — 477,944,690 Benefit from change in pension plan (46,368,308 ) (45,808,781 ) — — — — — — — — (92,177,089 ) Cost of sales 427,158,621 876,531,944 2,793 706,896 10,727,462 1,707,548 4,965,414 749,655,199 2,791,350 (1,182,282,621 ) 891,964,606 Gross income (loss) (84,544,760 ) (33,131,966 ) (2,793 ) 805,074 (5,602,140 ) (2,864 ) (1,198,630 ) 11,358,079 16,010,197 (19,662,012 ) (115,971,815 ) Other revenues (expenses), net (7,957,202 ) 1,243,040 — 38 26,941 14,680 19,909 1,666,783 2,219,539 1,890,785 (875,487 ) Distribution, transportation and sales expenses — 35,292,527 1,448 — 3,009 4,416 62,071 428,613 254 (6,863,699 ) 28,928,639 Administrative expenses 18,454,281 40,529,587 47,670 8,553 104,794 152,404 519,351 1,967,581 61,609,813 (10,921,939 ) 112,472,095 Benefit from change in pension plan (17,853,725 ) (39,975,450 ) — — — — — — (46,031,780 ) — (103,860,955 ) Operating income (loss) (93,102,518 ) (67,735,590 ) (51,911 ) 796,559 (5,683,002 ) (145,004 ) (1,760,143 ) 10,628,668 2,651,449 14,411 (154,387,081 ) Financing income 25,852,078 2,789,535 — 43,690 37 3,503 7,728 1,147,870 110,816,691 (125,670,273 ) 14,990,859 Financing cost (90,822,360 ) (13,738,104 ) 2,110 (95,280 ) (61,153 ) — — (1,299,580 ) (87,289,616 ) 125,530,390 (67,773,593 ) Derivative financial instruments (cost) income, net — 6,463 — — — — — 1,347,323 (22,803,663 ) — (21,449,877 ) Foreign exchange (loss), net (132,165,427 ) (7,364,486 ) (7,509 ) (92,046 ) (11,090 ) (3,600 ) (2,802 ) (49,190 ) (15,069,424 ) — (154,765,574 ) (Loss) profit sharing in joint ventures and associates (473,082 ) 671,868 — — — — — 2,056,259 (749,900,890 ) 749,963,960 2,318,115 Taxes, duties and other 376,682,705 1,839,021 — 197,491 (2,069,848 ) — — 5,134,176 (50,283,298 ) — 331,500,247 Net (loss) income (667,394,014 ) (87,209,335 ) (57,310 ) 455,432 (3,685,360 ) (145,101 ) (1,755,217 ) 8,697,174 (711,312,155 ) 749,838,488 (712,567,398 ) Total current assets 709,252,019 313,801,630 655,239 2,171,717 49,162,929 1,594,643 4,988,511 73,116,155 275,582,816 (1,163,125,162 ) 267,200,497 Investments in joint ventures and associates 919,654 6,687,977 — — — 8,500 — 11,845,489 (242,233,405 ) 246,937,384 24,165,599 Wells, pipelines, properties, plant and equipment, net 966,144,619 246,463,069 — 22,647,454 58,078,603 7,405,969 18,480,684 3,045,704 22,217,529 — 1,344,483,631 Total assets 1,698,909,240 567,486,579 655,240 24,917,981 111,307,038 9,034,376 23,705,118 93,266,620 1,443,189,885 (2,196,817,877 ) 1,775,654,200 Total current liabilities 278,507,394 104,569,842 469,524 1,981,652 14,698,159 1,486,468 4,534,980 34,749,438 1,157,183,570 (1,154,773,306 ) 443,407,721 Long-term debt 1,252,239,594 16,707,005 — 12,031,849 4,850,905 — — 3,607,840 1,285,676,066 (1,274,240,092 ) 1,300,873,167 Employee benefits 379,150,943 609,492,623 61,171 417,817 368,036 12,533 3,611 (59,581 ) 289,938,288 — 1,279,385,441 Total liabilities 1,985,557,185 735,280,560 530,696 14,431,318 19,917,100 1,499,001 4,538,591 41,420,792 2,747,910,113 (2,443,755,258 ) 3,107,330,098 Equity (deficit), net (286,647,945 ) (167,793,981 ) 124,544 10,486,663 91,389,938 7,535,375 19,166,527 51,845,828 (1,304,720,228 ) 246,937,381 (1,331,675,898 ) Depreciation and amortization 144,567,149 20,916,796 — 612,741 337,364 158,505 442,504 84,493 831,698 — 167,951,250 Net periodic cost of employee benefits 23,608,485 21,392,600 (298 ) — (310 ) — — (119,819 ) 17,668,484 — 62,549,142 Acquisition of wells, pipelines, properties, plant and equipment 184,786,051 68,935,841 — — 1,544,224 320,762 1,882,108 677,314 6,711,511 — 264,857,811 PEMEX’s management measures the performance of the segments based on operating income and net segment income before elimination of unrealized intersegment gain (loss), as well as by analyzing the impact of the results of each segment on the consolidated financial statements. For certain of the items in these consolidated financial statements to conform with the individual financial statements of the operating segments, they must be reconciled. The tables below present the financial information of PEMEX’s operating segments, before intersegment eliminations: The following tables present accounting reconciliations between individual and consolidated information. As of/for the year ended December 31, 2017 Exploration and Industrial Cogeneration Drilling Logistics Fertilizers Ethylene Trading Corporate Sales: By segment Ps. 762,637,362 1,015,157,118 448,988 6,679,132 74,386,812 4,795,196 14,214,138 1,047,874,453 83,017,684 Less unrealized intersegment sales — (1,223,752 ) — (3,236,935 ) — (26,886 ) — (75,530 ) — Total consolidated sales Ps. 762,637,362 1,013,933,366 448,988 3,442,197 74,386,812 4,768,310 14,214,138 1,047,798,923 83,017,684 Operating income (loss): By segment Ps. 194,814,292 (59,989,652 ) (72,358 ) 882,692 (61,696,313 ) (7,148,431 ) (4,698,838 ) 14,490,017 (21,628,448 ) Less unrealized intersegment sales — (1,223,752 ) — (3,236,935 ) — (26,886 ) — (75,530 ) — Less unrealized gain due to production cost valuation of inventory (496,329 ) (9,017,791 ) — 2,932,663 — — — (246,594 ) — Less capitalized refined products (574,381 ) — — — — — — — — Less amortization of capitalized interest 118,981 — — — — — — — — Less depreciation and impairment of revaluated transferred assets — — — 1,475,376 53,488,972 3,134,974 3,223,449 — — Total consolidated operating income (loss) Ps. 193,862,563 (70,231,195 ) (72,358 ) 2,053,796 (8,207,341 ) (4,040,343 ) (1,475,389 ) 14,167,893 (21,628,448 ) Net income (loss): By segment Ps. (150,388,699 ) (44,599,751 ) (358,862 ) 345,913 (40,300,942 ) (8,616,130 ) (5,866,542 ) 5,200,268 (292,266,613 ) Less unrealized intersegment sales — (1,223,752 ) — (3,236,935 ) — (26,886 ) — (75,530 ) — Less unrealized gain due to production cost valuation of inventory (496,329 ) (9,017,791 ) — 2,932,663 — — — (246,594 ) — Less capitalized refined products (574,381 ) — — — — — — — — Less equity method elimination 303,044 (945,369 ) 266,769 — 333 1,238,018 1,201,367 7,166,957 — Less amortization of capitalized interest 118,981 — — — — — — — — Less depreciation and impairment of revaluated transferred assets, net of deferred taxes — — — 1,223,919 39,466,660 3,134,974 3,223,449 — — Total consolidated net (loss) income Ps. (151,037,384 ) (55,786,663 ) (92,093 ) 1,265,560 (833,949 ) (4,270,024 ) (1,441,726 ) 12,045,101 (292,266,613 ) Assets: By segment Ps. 2,084,553,745 912,770,881 179,807 28,256,876 276,537,764 17,689,305 35,498,783 195,538,239 2,111,740,735 Less unrealized intersegment sales 858,094 (5,389,977 ) — — 7,183 — (5,303 ) (408,059 ) — Less unrealized gain due to production cost valuation of inventory (3,657,242 ) (42,379,229 ) — — — (26,886 ) — (7,163,664 ) — Less capitalized refined products (574,381 ) — — — — — — — — Less depreciation and impairment of revaluated transferred assets, net of deferred taxes (22,503,168 ) — — (2,036,128 ) (84,557,831 ) (2,165,068 ) (9,522,686 ) (424,849 ) — Less equity method for unrealized profits (759,624 ) (7,813,492 ) — — (91,123 ) (6,573,895 ) (2,828,749 ) (732,768 ) — Less amortization of capitalized interest 118,981 8,123 — — — — — — — Total consolidated assets Ps. 2,058,036,405 857,196,306 179,807 26,220,748 191,895,993 8,923,456 23,142,045 186,808,899 2,111,740,735 Liabilities: By segment Ps. 2,570,412,398 1,081,528,677 531,580 13,186,297 56,706,251 6,556,050 2,308,890 116,648,398 3,587,988,972 Less unrealized intersegment sales — (4,419,929 ) — 700,127 — — — 194,483 — Total consolidated liabilities Ps. 2,570,412,398 1,077,108,748 531,580 13,886,424 56,706,251 6,556,050 2,308,890 116,842,881 3,587,988,972 As of/for the year ended Exploration and Industrial Cogeneration and Drilling and Logistics Fertilizers Ethylene Trading Corporate and Sales: By segment Ps. 616,380,615 771,597,427 184,434 6,263,093 71,130,845 4,775,775 17,217,131 800,979,076 53,803,095 Less unrealized intersegment sales — (847,432 ) — (4,211,227 ) — — — (331,446 ) — Total consolidated sales Ps. 616,380,615 770,749,995 184,434 2,051,866 71,130,845 4,775,775 17,217,131 800,647,630 53,803,095 Operating income (loss): By segment Ps. 503,679,153 (60,347,367 ) (22,645 ) 1,271,202 (25,701,065 ) (2,877,725 ) (3,504,812 ) 19,526,997 (14,909,525 ) Less unrealized intersegment sales — (847,432 ) — (4,211,227 ) — — — (331,446 ) — Less unrealized gain due to production cost valuation of inventory (273,237 ) 3,572,498 — 3,815,371 — 905,910 (2,163 ) (213,069 ) — Less capitalized refined products (1,661,986 ) (7,904,259 ) — — — — — — — Less amortization of capitalized interest 118,981 — — — — — — — — Less depreciation and impairment of revaluated assets — — — 640,702 6,899,211 357,455 5,544,830 — — Total consolidated operating income (loss) Ps. 501,862,911 (65,526,560 ) (22,645 ) 1,516,048 (18,801,854 ) (1,614,360 ) 2,037,855 18,982,482 (14,909,525 ) Net income (loss): By segment Ps. (44,069,001 ) (61,639,067 ) (381,214 ) (387,250 ) (16,917,356 ) (7,820,835 ) (3,780,706 ) 11,711,265 (194,251,296 ) Less unrealized intersegment sales — (847,432 ) — (4,211,227 ) — — — (331,446 ) — Less unrealized gain due to production cost valuation of inventory (273,237 ) 3,572,498 — 3,815,371 — 905,910 (2,163 ) (213,069 ) — Less capitalized refined products (1,661,986 ) (7,904,259 ) — — — — — — — Less equity method elimination 6,590 (3,047,030 ) 346,514 — — 4,897,988 334,653 — — Less amortization of capitalized interest 118,981 — — — — — — — — Less depreciation of revaluated assets — — — 640,702 6,899,211 357,455 5,544,830 — — Total consolidated net (loss) income Ps. (45,878,653) (69,865,290 ) (34,700 ) (142,404 ) (10,018,145 ) (1,659,482 ) 2,096,614 11,166,750 (194,251,296 ) Assets: By segment Ps.2,232,052,453 1,151,907,566 425,141 30,990,147 254,615,026 10,421,225 43,067,636 170,782,928 2,359,024,145 Less unrealized intersegment sales 483,230 (4,158,101 ) — — — — (5,304 ) (332,529 ) — Less unrealized gain due to production cost valuation of inventory (3,246,782 ) (33,361,438 ) — — — — — (5,688,341 ) — Less capitalized refined products (1,661,986 ) — — — — — — — — Less depreciation of revalued assets (20,585,300 ) — — (3,316,549 ) (123,790,105 ) (5,300,044 ) (12,746,136 ) (652 ) — Less equity method for unrealized profits (742,055 ) (7,293,447 ) (36,718 ) — — 4,435,288 (4,308,877 ) (8,960,344 ) — Less amortization of capitalized interest 118,981 — — — — — — (424,198 ) — Total consolidated assets Ps.2,206,418,541 1,107,094,580 388,423 27,673,598 130,824,921 9,556,469 26,007,319 155,376,864 2,359,024,145 Liabilities: By segment Ps.2,533,221,665 1,282,558,220 664,829 16,457,347 29,336,417 3,015,450 3,901,722 85,392,123 3,553,477,189 Less unrealized intersegment sales — (4,419,930 ) — 395,855 — — — 1,493,766 — Total consolidated liabilities Ps.2,533,221,665 1,278,138,290 664,829 16,853,202 29,336,417 3,015,450 3,901,722 86,885,889 3,553,477,189 As of/for the year ended December 31, 2015 Exploration and Industrial Cogeneration and Drilling and Logistics Fertilizers Ethylene Trading Corporate and Sales: By segment Ps. 690,642,133 874,630,488 — 1,511,970 10,954,841 1,704,684 5,048,600 761,213,475 18,801,547 Less unrealized intersegment sales — (597,212 ) — — — — (5,304 ) (200,197 ) — Total consolidated sales Ps. 690,642,133 874,033,276 — 1,511,970 10,954,841 1,704,684 5,043,296 761,013,278 18,801,547 Operating income (loss): By segment Ps. (89,473,302 ) (88,819,558 ) (51,911 ) 700,748 (6,875,252 ) (262,145 ) (2,288,747 ) 10,334,138 2,651,449 Less unrealized intersegment sales — (597,212 ) — — — — (5,304 ) (200,197 ) — Less unrealized gain due to production cost valuation of inventory (251,995 ) 21,681,180 — — — — 2,163 494,727 — Less capitalized refined products (3,496,201 ) — — — — — — — — Less amortization of capitalized interest 118,980 — — — — — — — — Less depreciation and impairment of revaluated assets — — — 95,811 1,192,250 117,141 531,745 — — Total consolidated operating (loss) income Ps. (93,102,518 ) (67,735,590 ) (51,911 ) 796,559 (5,683,002 ) (145,004 ) (1,760,143 ) 10,628,668 2,651,449 Net income (loss): By segment Ps. (663,719,119 ) (107,164,261 ) (57,310 ) 359,621 (4,877,610 ) (262,242 ) (2,314,774 ) 8,402,644 (711,312,155 ) Less unrealized intersegment sales — (597,212 ) — — — — (5,304 ) (200,197 ) — Less unrealized gain due to production cost valuation of inventory (251,995 ) 21,681,180 — — — — 2,163 494,727 — Less capitalized refined products (3,496,201 ) — — — — — — — Less equity method elimination (45,679 ) (1,129,042 ) — — — — 30,953 — — Less amortization of capitalized interest 118,980 — — — — — — — — Less depreciation of revaluated assets — — — 95,811 1,192,250 117,141 531,745 — — Total consolidated net (loss) income Ps. (667,394,014 ) (87,209,335 ) (57,310 ) 455,432 (3,685,360 ) (145,101 ) (1,755,217 ) 8,697,174 (711,312,155 ) Supplemental geographic information: For the years ended December 31, 2017 2016 2015 Domestic sales Ps. 877,360,038 Ps. 670,000,473 Ps. 746,235,912 Export sales: United States 302,912,999 221,954,461 266,826,499 Canada, Central and South America 13,943,080 14,058,897 11,027,813 Europe 71,470,613 64,348,997 58,707,787 Other 120,212,420 94,755,762 70,652,346 Total export sales 508,539,112 395,118,117 407,214,445 Services income 11,130,569 8,974,642 8,310,035 Total sales Ps. 1,397,029,719 Ps. 1,074,093,232 Ps. 1,161,760,392 PEMEX does not have significant long-lived assets outside of Mexico. The following table shows income by product:

Cash, Cash Equivalents and Rest

Cash, Cash Equivalents and Restricted Cash	12 Months Ended
	Dec. 31, 2017
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Cash, Cash Equivalents and Restricted Cash	NOTE 6. CASH, CASH EQUIVALENTS AND RESTRICTED CASH a. As of December 31, 2017 and 2016, cash and cash equivalents were as follows: 2017 2016 Cash on hand and in banks (i) Ps. 55,871,127 Ps. 71,430,427 Highly liquid investments (ii) 41,980,627 92,102,086 Ps. 97,851,754 Ps. 163,532,513 (i) Cash on hand and in banks is primarily composed of cash in banks. (ii) Mainly composed of short-term Mexican Government investments. b. At December 31, 2017 and 2016, restricted cash was as follows: 2017 2016 Restricted cash Ps. — Ps. 10,478,626 Restricted cash as of December 31, 2016 was primarily composed of the deposit made by Pemex Exploration and Production in the amount of U.S. $465,060, plus interests as a result of an arbitration claim filed by Corporación Mexicana de Mantenimiento Integral, S. de R.L. de C.V. (“COMMISA”) before the International Court of Arbitration of the International Chamber of Commerce (the “ICA”). On April 6, 2017, Pemex Exploration and Production and Petróleos Mexicanos executed a settlement agreement with COMMISA and agreed to pay COMMISA U.S. $435,000, plus the applicable VAT with the funds deposited by Pemex Exploration and Production in a bank account as a guarantee before the U.S. District Court for the Southern District of New York and through a wire transfer. During 2016, PMI HBV made deposits of U.S. $41,319, in an account in Banco Santander, S.A. as additional collateral for a credit agreement in accordance with the terms of the agreement. The credit agreement required that PMI HBV maintain a loan-to-value

Accounts Receivable, Net

Accounts Receivable, Net	12 Months Ended
	Dec. 31, 2017
Text block1 [abstract]
Accounts Receivable, Net	NOTE 7. ACCOUNTS RECEIVABLE, NET As of December 31, 2017 and 2016, accounts receivable and other receivables were as follows: 2017 2016 Domestic customers, net Ps. 60,057,141 Ps. 41,884,579 Export customers, net 54,428,883 34,859,341 Sundry debtors 26,105,703 18,736,922 Taxes to be recovered and prepaid taxes 23,039,023 29,361,303 Employees and officers 5,681,478 6,054,251 Advances to suppliers 1,250,846 2,246,437 Other accounts receivable 82,160 77,694 Ps. 170,645,234 Ps. 133,220,527 The following table shows a breakdown of accounts receivable based on their credit history at December 31, 2017 and 2016: Domestic customers 2017 2016 1 to 30 days Ps. 10,188,070 Ps.1,767,718 31 to 60 days 4,081,862 658,456 61 to 90 days 777,409 263,447 More than 90 days (i) 11,345,933 1,016,553 Past due 26,393,274 3,706,174 Impaired (reserved) (951,932 ) (458,428 ) Unimpaired 25,441,342 3,247,746 Current 34,615,799 38,636,833 Total Ps. 60,057,141 Ps.41,884,579 (i) The increase in 2017 in accounts receivable invoices more than 90 days old is primarily due to the termination of the outstanding balances compensation system in place between Mexican Government owned companies. Export customers 2017 2016 1 to 30 days Ps. 334,155 Ps. 341,184 31 to 60 days — 6,824 61 to 90 days — 35,372 More than 90 days 315,888 624,157 Past due 650,043 1,007,537 Impaired (reserved) (272,813 ) (374,699 ) Unimpaired 377,230 632,838 Current 54,051,653 34,226,503 Total Ps. 54,428,883 Ps. 34,859,341 Additionally, the reconciliation for impaired accounts receivable is as follows: Domestic customers 2017 2016 Balance at the beginning of the year Ps. (458,428 ) Ps. (667,883 ) Additions against income (493,514 ) (218,836 ) Amount used 10 428,291 Balance at the end of the year Ps. (951,932 ) Ps. (458,428 ) Export customers 2017 2016 Balance at the beginning of the year Ps. (374,699 ) Ps. (312,004 ) Additions against income (204,713 ) (25,931 ) Amount used 297,047 — Translation effects 9,552 (36,764 ) Balance at the end of the year Ps. (272,813) Ps. (374,699)

Inventories, Net

Inventories, Net	12 Months Ended
	Dec. 31, 2017
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Inventories, Net	NOTE 8. INVENTORIES, NET As of December 31, 2017 and 2016, inventories were as follows: 2017 2016 Refined and petrochemicals products Ps. 27,862,384 Ps. 21,534,846 Products in transit 19,112,606 7,735,163 Crude oil 11,445,780 11,391,310 Materials and products in stock 5,172,779 4,721,834 Materials in transit 180,711 419,547 Gas and condensate products 84,670 89,360 Ps. 63,858,930 Ps. 45,892,060

Held-for-Sale Non-Financial Ass

Held-for-Sale Non-Financial Assets	12 Months Ended
	Dec. 31, 2017
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Held-for-Sale Non-Financial Assets	NOTE 9. HELD—FOR—SALE NON-FINANCIAL Pursuant to Round Zero, PEMEX was provisionally assigned titles to certain blocks in escrow. The ownership of the fixed assets located in those blocks is transferred when the blocks are awarded to third parties in subsequent rounds. As a result of the Energy Reform Decree, the secondary legislation and the corresponding initial adjudication of rights for the exploration and extraction of oil and solid hydrocarbons addressed in transitory article 6 of the Energy Reform Decree, certain assignments that Pemex Exploration and Production received from the Mexican Government were affected. The Mexican Government will compensate PEMEX for these investments at fair value pursuant to the terms determined by the Ministry of Energy. In 2016, pursuant to Round 1.3, the Ministry of Energy awarded certain contractual areas for the exploration and extraction of oil and solid hydrocarbons to third parties and their respective fixed assets have been transferred from PEMEX to such third parties. During 2016, PEMEX submitted the application for compensation from the Ministry of Energy for the fixed assets located in those areas, receiving resolution in 2017. All the assets that are part of unassigned areas to PEMEX as part of Round Zero continue to be classified as long-lived assets, subject to all regulations applicable to such assets, provided PEMEX (1) obtains the economic benefits derived from the use thereof and (2) at the same time exercises control over them and assumes the benefits and risks associated with such assets. Assets that are part of the areas that were not assigned to PEMEX as part of Round Zero, and from which PEMEX does not obtain economic benefits derived from use of such assets, are written down, affecting the results for that year. As a result, of the Ps. 7,460,674 held-for-sale, non-financial

Available-for-Sale-Financial As

Available-for-Sale-Financial Assets	12 Months Ended
	Dec. 31, 2017
Text block1 [abstract]
Available-for-Sale-Financial Assets	NOTE 10. AVAILABLE—FOR—SALE—FINANCIAL ASSETS a. On January 1, 2016, PEMEX had a total of 20,724,331 shares of Repsol valued at Ps. 3,944,696, which represented approximately 1.48% of Repsol’s share capital. On January 15, 2016, PMI HBV received 942,015 new Repsol shares valued at Ps. 188,490 as an in-kind On June 13, 2016, Repsol declared flexible dividends to its shareholders, of which PMI HBV received 555,547 new Repsol shares as an in-kind Since the 1,497,562 new Repsol shares were received as an in-kind available-for-sale On December 14, 2016, Repsol declared flexible dividends to its shareholders, of which PMI HBV received 584,786 new Repsol shares as an in-kind As of December 31, 2016, the investment in 20,724,331 shares of Repsol held by PMI HBV was valued at Ps. 6,027,540. These shares are presented under non-current On January 24, 2017 and January 25, 2017, PMI HBV sold a total of 2,082,348 Repsol shares at an average price of € 14.17 per share, for a total amount of Ps. 684,029. These shares were not included as collateral on the loan agreement. On June 7, 2017, Repsol declared flexible dividends to its shareholders, of which PMI HBV received 609,539 new Repsol shares as an in-kind On October 26, 2017, PMI HBV sold 21,333,870 Repsol shares for a total amount of Ps. 7,342,807 pursuant to a share forward transaction with Credit Agricole CIB. This sale, together with the sale on January 24 and 25, 2017, resulted in a total loss of Ps. 3,523,748. As a result of the above, PEMEX does not have an equity interest in Repsol as of December 31, 2017. The 2016 balance allocated in other comprehensive income for Ps. 5,564,130 was transferred to the results of the year. b. As of December 31, 2016, due to the loss of significant influence in TAG Norte Holding, S. de R. L. de C. V. and TAG Pipelines Sur, S. de R. L. de C. V., these companies were valued at fair value and are presented as short-term available-for-sale As of December 31, 2017, PEMEX is in the process of selling its shares of TAG Norte Holding, S. de R.L. de C.V. and TAG Pipeline Sur, S. de R.L. de C.V. These shares have been classified as available-for-sale-financial-assets available-for-sale non-financial

Investments in Joint Ventures a

Investments in Joint Ventures and Associates	12 Months Ended
	Dec. 31, 2017
Investments Schedule [Abstract]
Investments in Joint Ventures and Associates	NOTE 11. INVESTMENTS IN JOINT VENTURES AND ASSOCIATES The investments in joint ventures and associates as of December 31, 2017 and 2016, were as follows: Percentage of December 31, 2017 2016 Deer Park Refining Limited 49.99% Ps.14,405,542 Ps.14,039,384 Petroquímica Mexicana de Vinilo, S. A. de C. V. (i) 44.09% — 4,309,050 Sierrita Gas Pipeline LLC 35.00% 1,084,169 1,112,338 Frontera Brownsville, LLC. 50.00% 471,085 478,414 CH4 Energía, S. A. 50.00% 315,713 194,868 Texas Frontera, LLC. 50.00% 239,782 260,828 Administración Portuaria Integral de Dos Bocas, S.A. de C.V. 40.00% 64,328 139,523 PMV Minera, S.A. de C.V. 44.09% 45,133 61,779 Ductos el peninsular, S.A.P.I de C. V. 50.00% 18,336 18,626 Other-net Various 63,276 122,699 Ps.16,707,364 Ps.20,737,509 i. On April 20, 2016, an explosion occurred in the “Planta de Clorados 3” (Chlorinated Plant 3) of the Petroquímica Mexicana de Vinilo, resulting in approximately U.S. $ 461,000 in damages. Chorinated Plant 3 incurred the greatest amount of damage, including the loss of certain assets and the closure of the plant for an undefined amount of time. The Chlorine-Soda plants and the ethylene plants did not register any damage. On December 20, 2017, Petroquímica Mexicana de Vinilo permanently closed the plant, and -the written-off Profit (loss) sharing in joint ventures and associates: 2017 2016 2015 Deer Park Refining Limited Ps. 920,409 Ps. 1,437,850 Ps. 1,913,835 Ductos y Energéticos del Norte, S.A. de C.V. (i) 360,092 — — CH4 Energía S.A. de C.V. 125,132 — — Sierrita Gas Pipeline LLC 129,401 105,825 152,445 PMV Minera, S.A. de C.V. 6,253 — — Petroquímica Mexicana de Vinilo, S. A. de C. V. (1,223,640 ) (190,468 ) (61,952 ) Administración Portuaria Integral de Dos Bocas, S.A. de C.V. (75,195 ) — — Gasoductos de Chihuahua, S. de R. L. de C. V. (ii) — 638,126 666,779 Compañía Mexicana de Exploraciones, S. A. de C. V. (iii) — — (496,774 ) Other, net 117,988 144,512 143,782 Profit sharing in joint ventures and associates, net Ps. 360,440 Ps. 2,135,845 Ps. 2,318,115 i. In November 2017, PEMEX sold its 50% interest in Ductos y Energéticos del Norte, S. de R.L. de C. V., to Infraestructura Energética Nova, S.A.B. of C.V. for a total of U.S. $ 3,141,710, yielding a profit of Ps. 3,139,103. ii. On September 28, 2016, PEMEX completed the divestiture of its 50% ownership interest in the Gasoductos de Chihuahua S. de R.L. de C.V. joint venture with Infraestructura Energética Nova, S.A.B. de C.V. The stock was sold for Ps. 22,684,736, yielding a profit of Ps. 15,211,039. iii. Beginning July 1, 2016 this company was included in the consolidated financial statements of PEMEX. Until June 30, 2016 this Company was accounted for as an investment in an associate under the equity method (see Note 3-a). The following tables show condensed financial information of major investments recognized under the equity method during 2017 and 2016: Condensed statements of financial position Deer Park Refining Limited Sierrita Gas Pipeline, LLC 2017 2016 2017 2016 Total assets Ps. 41,075,547 Ps. 42,428,275 Ps.3,518,036 Ps.3,244,811 Total liabilities Ps. 12,261,581 Ps. 14,346,643 Ps. 420,410 Ps. 66,703 Total equity 28,813,966 28,081,632 3,097,626 3,178,108 Total liabilities and equity Ps.41,075,547 Ps. 42,428,275 Ps.3,518,036 Ps.3,244,811 Condensed statements of comprehensive income Deer Park Refining Limited Sierrita Gas Pipeline, Gasoductos de Chihuahua, December 31, December 31, August 31, December 31, 2017 2016 2015 2017 2016 2016 2015 Sales and other income Ps.16,427,064 Ps.16,750,155 Ps.16,658,705 Ps. 840,414 Ps. 717,351 Ps.3,798,666 Ps.4,617,982 Costs and expenses 14,586,061 13,874,172 12,830,653 470,697 414,994 2,522,415 3,284,424 Net result Ps. 1,841,003 Ps. 2,875,983 Ps. 3,828,052 Ps. 369,717 Ps. 302,357 Ps.1,276,251 Ps.1,333,558 Additional information about the significant investments in joint ventures and associates is presented below: • Deer Park Refining Limited • Petroquímica Mexicana de Vinilo, S.A. de C.V. Petroquímica Mexicana de Vinilo, S.A. de C.V. • Sierrita Gas Pipeline LLC. • Frontera Brownsville, LLC • Texas Frontera, LLC • CH4 Energía, S.A. • Administración Portuaria Integral de Dos Bocas, S.A. de C.V. • PMV Minera, S.A. de C.V. • Gasoductos de Chihuahua, S. de R.L. de C.V. • Compañía Mexicana de Exploraciones S.A. de C.V., (“COMESA”)

Wells, Pipelines, Properties, P

Wells, Pipelines, Properties, Plant and Equipment, Net	12 Months Ended
	Dec. 31, 2017
Text block1 [abstract]
Wells, Pipelines, Properties, Plant and Equipment, Net	NOTE 12. WELLS, PIPELINES, PROPERTIES, PLANT AND EQUIPMENT, NET Plants Drilling Pipelines Wells Buildings Offshore Furniture and Transportation Construction Land Unproductive Other fixed Total Investment Balances as of January 1, 2016 Ps. 648,412,014 21,680,343 419,979,508 1,066,515,651 66,284,466 260,328,096 52,966,194 15,329,095 211,675,597 43,347,802 — 630,878 2,807,149,644 Acquisitions 20,406,464 1,629,710 1,265,011 8,239,480 2,541,802 9,866,984 545,271 2,063,519 107,682,868 1,487,434 6,800 — 155,735,343 Reclassifications 150,817 — (1,268,887 ) 8,649,686 (6,610,184 ) — (561,569 ) (325,778 ) (282,044 ) 50,709 2,039 (137,246 ) (332,457 ) Capitalization 15,943,630 — 11,851,378 40,825,973 1,085,323 17,318,279 2,769 2,918,621 (89,945,973 ) — — — — Impairment 81,135,967 — 31,967,407 198,974,994 — 35,640,491 438,979 8,743 (16,852,238 ) — — — 331,314,343 Disposals (7,602,782 ) (40,937 ) (3,648,989 ) (4,382,867 ) (558,374 ) (449,645 ) (2,644,957 ) (551,355 ) (4,864,062 ) (314,327 ) (8,839 ) (2,126 ) (25,069,260 ) Balances as of December 31, 2016 758,446,110 23,269,116 460,145,428 1,318,822,917 62,743,033 322,704,205 50,746,687 19,442,845 207,414,148 44,571,618 — 491,506 3,268,797,613 Acquisitions 10,018,030 418,283 7,054,793 14,937,882 802,300 7,811,374 1,183,679 284,445 51,410,469 58,563 — — 93,979,818 Reclassifications 3,146,955 — (53,349 ) — 98,245 (10,199,213 ) (96,899 ) (75,674 ) (812,943 ) (560 ) — 4,072,464 (3,920,974 ) Capitalization 43,033,864 — 21,357,074 36,564,811 1,265,246 8,677,765 30,879 3,746,395 (114,700,828 ) 29,248 — (4,454 ) — Impairment (48,020,616 ) — 2,226,771 (83,236,991 ) — (15,564,190 ) — — (6,849,534 ) — — — (151,444,560 ) Disposals (10,598,983 ) (244,283 ) (8,862,541 ) (19,340,709 ) (208,353 ) — (806,694 ) (226,375 ) (6,724,930 ) (112,170 ) — (4,440,865 ) (51,565,902 ) Balances as of December 31, 2017 Ps. 756,025,360 23,443,116 481,868,176 1,267,747,910 64,700,471 313,429,941 51,057,652 23,171,636 129,736,382 44,546,699 — 118,651 3,155,845,995 Accumulated depreciation and amortization Balances as of January 1, 2016 Ps.(321,283,906 ) (578,015 ) (139,331,407 ) (780,443,639 ) (37,712,087 ) (140,908,960 ) (36,513,479 ) (5,894,520 ) — — — — (1,462,666,013 ) Depreciation and amortization (44,549,443 ) (2,364,560 ) (15,153,879 ) (70,090,038 ) (1,796,383 ) (12,252,810 ) (3,205,089 ) (1,027,289 ) — — — — (150,439,491 ) Reclassifications (10,521 ) — (166,632 ) (3,077 ) (108,718 ) — 166,914 454,492 — — — — 332,458 Disposals 5,826,891 — 2,286,691 — 492,557 — 2,560,988 550,554 — — — — 11,717,681 Balances as of December 31, 2016 (360,016,979 ) (2,942,575 ) (152,365,227 ) (850,536,754 ) (39,124,631 ) (153,161,770 ) (36,990,666 ) (5,916,763 ) — — — — (1,601,055,365 ) Depreciation and amortization (45,709,123 ) (2,198,867 ) (15,095,115 ) (74,673,473 ) (1,906,164 ) (13,192,369 ) (2,890,563 ) (1,038,839 ) — — — — (156,704,513 ) Reclassifications 2,799,244 — (72,841 ) — (69,236 ) 1,146,904 102,375 14,532 — — — — 3,920,978 Disposals 8,902,711 127,458 7,573,769 16,810,591 59,022 — 805,916 222,764 — — — — 34,502,231 Balances as of December 31, 2017 Ps.(394,024,147 ) (5,013,984 ) (159,959,414 ) (908,399,636 ) (41,041,009 ) (165,207,235 ) (38,972,938 ) (6,718,306 ) — — — — (1,719,336,669 ) Wells, pipelines, properties, plant and equipment—net as of December 31, 2016 Ps. 398,429,131 20,326,541 307,780,201 468,286,163 23,618,402 169,542,435 13,756,021 13,526,082 207,414,148 44,571,618 — 491,506 1,667,742,248 Wells, pipelines, properties, plant and equipment—net as of December 31, 2017 Ps. 362,001,214 18,429,132 321,908,762 359,348,274 23,659,462 148,222,706 12,084,714 16,453,330 129,736,382 44,546,699 — 118,651 1,436,509,326 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 — — — — — a. As of December 31, 2017, 2016 and 2015, 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. 3,060,963, Ps. 3,667,752 and Ps. 5,258,854, respectively. b. The combined depreciation of fixed assets and amortization of wells for the fiscal years ended December 31, 2017, 2016 and 2015, recognized in operating costs and expenses, was Ps.156,704,513, Ps. 150,439,491 and Ps. 167,951,250, respectively, which includes costs related to plugging and abandonment of wells for the years ended December 31, 2017, 2016 and 2015 of Ps. 850,015, Ps. 1,698,312, and Ps. 1,401,870, respectively. c. As of December 31, 2017 and 2016, provisions relating to future plugging of wells costs amounted to Ps. 68,797,600 and Ps. 64,967,710, respectively, and are presented in the “Provisions for plugging of wells” (see Note 18). d. As of December 31, 2017 and 2016, acquisitions of property, plant and equipment include transfers from wells unassigned to a reserve for Ps. 16,440,645 and Ps. 16,393,773, respectively (see Note 13) and Ps. 4,652,314 from available-for-sale non-financial e. As of December 31, 2017 and 2016, PEMEX recognized a net impairment of Ps. 151,444,560 and a net reversal of impairment of Ps. 331,314,343, respectively, which is presented as a separate line item in the consolidated statement of comprehensive income as follows: i. As of December 31, 2017, the net impairment was as follows: Impairment Reversal of Net Pemex Exploration and Production Ps. (129,350,315 ) Ps. — Ps. (129,350,315 ) Pemex Industrial Transformation (19,751,882 ) 3,799,790 (15,952,092 ) AGRO (4,206,653 ) — (4,206,653 ) Pemex Fertilizers (1,935,500 ) — (1,935,500 ) Total Ps. (155,244,350 ) Ps. 3,799,790 Ps. (151,444,560 ) Cash Generating Unit of Pemex Exploration and Production Pemex Exploration and Production recognized an impairment in the amount of Ps. 129,350,315 as of December 31, 2017, arising from: (i) the deferral of the development investments in the first 5 years of the economic horizon in the proved reserves, which caused a decrease in production and consequently in income, as well as the re-categorization The cash generating units of Pemex Exploration and Production are investment projects in productive fields with hydrocarbon reserves associated with proved reserves (1P). 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. To determine the value in use of long-lived assets associated with hydrocarbon extraction, the net present value of reserves is determined based on the following assumptions: Average crude oil price 55.89 U.S. dollars/bl Average gas price 4.92 U.S. dollars /mpc Average condensates price 38.33 U.S. dollars /bl Discount rate 14.40% annually The total forecast production, calculated with a horizon of 25 years is 7,091 million bpce. 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 (1P). The recoverable amount on each asset is the value in use. Cash Generating Units of Pemex Industrial Transformation As of December 31, 2017, Pemex Industrial Transformation recognized a net impairment of Ps. (15,952,092). The impairment was in the following cash generating units: Minatitlán Refinery Ps. (5,691,005 ) Madero Refinery (8,480,880 ) Salina Cruz Refinery (5,579,997 ) Total impairment of assets (19,751,882 ) Cangrejera Petrochemical Center 3,565,355 Independencia Petrochemical Center 112,292 Arenque gas processor complex 57,039 Matapionche gas processor complex 65,104 Reversal of impairment 3,799,790 Net impairment Ps. (15,952,092 ) The impairment was mainly due to (i) an increase in capitalizable maintenance expenses in refining; (ii) the appreciation of the Mexican peso against the U.S. dollar, from a peso—U.S. dollar exchange rate of Ps. 20.6640 to U.S. $1.00 as of December 31, 2016 to a peso—U.S. dollar exchange rate of Ps. 19.7867 to U.S. $1.00 as of December 31, 2017; partially offset by (i) an increase in the transportation fees; (ii) an increase in the processing of wet gas due to higher imports of this product and redistribution by Pemex Exploration and Production; (iii) an increase in prices arising from the price liberalization in 2017; and (iv) a decrease in the discount rate of cash generating units of refined products, gas and petrochemicals of 4.4%, 4.5%, and 5.6%, respectively. Cash-generating units 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 cash generating units or by a third party. Each processing center of Pemex Industrial Transformation 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. 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 cash generating units, budget programs and various statistical models that consider historical information of processes and the capacity of the various processing centers. To determine the value in use of long-lived assets associated with the cash-generating units of Pemex Industrial Transformation, the net present value of cash flows was determined based on the following assumptions: Refining Gas Petrochemicals Average crude oil Price 51.30 U.S. dollars N.A. N.A. Processed volume 767 mbd 3,085 mmpcd or sour gas Variable because the Rate of U.S. dollar Ps.19.7867 mxp/usd Ps.19.7867 mxp/usd Ps.19.7867 mxp/usd Useful lives of the cash generating units Average of 16 years Average of 9 years Average of 6 years Discount rate 11.53% annually 10.24% annually 9.71% annually Period 2018-2034 2018-2029 2016-2024 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 cash flows, taking into consideration the volumes to be produced and sales to be carried out. As of December 31, 2017, the value in use for the impairment or reversal of impairment of fixed assets was as follows: Minatitlán Refinery Ps. 32,531,925 Madero Refinery 11,420,952 Salina Cruz Refinery 12,051,597 Cangrejera Petrochemical Center 17,544,825 Independencia Petrochemical Center 3,146,413 Arenque gas processor complex 1,283,201 Matapionche gas processor complex 1,074,729 Total value in use Ps. 79,053,642 Pro-Agroindustria, Pro-Agroindustria, Cash Generating Units of Pemex Fertilizers Cash generating units are plants used in the ammonia process. Pemex Fertilizers recognized an impairment of Ps. (1,935,500) for the year ended December 31, 2017 resulting from (i) a decrease in the production capacity in fertilizers plants due to a shortage of raw material; (ii) an increase in raw material prices; and (iii) a decrease in ammonia sale prices. 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. The value in use for the impairment of fixed assets was Ps. 2,744,600. The discount rate used was 9.71%. ii. As of December 31, 2016, the net reversal of impairment was as follows: Impairment Reversal of Reversal of Pemex Exploration and Production Ps. (16,872,238 ) Ps. 288,581,670 Ps. 271,709,432 Pemex Industrial Transformation (2,768,267 ) 55,267,148 52,498,881 Pemex Logistics — 5,829,520 5,829,520 Pemex Ethylene — 1,276,510 1,276,510 Total Ps. (19,640,505 ) Ps. 350,954,848 Ps. 331,314,343 Cash Generating Unit of Pemex Exploration and Production Pemex Exploration and Production recognized a net reversal of impairment in the amount of Ps. 271,709,432 as of December 31, 2016, arising from (1) a reversal of Ps. 288,581,670 mainly due to the reallocation of resources towards oil fields with highest profitability and net cash flows arising from relatively greater efficiency in oil extraction and lower production costs, which fields are located primarily in the Aceite Terciario del Golfo, Crudo Ligero Marino, Burgos, Cantarell and Antonio J. Bermudez crude oil projects, (ii) the appreciation of the U.S. dollar against the Mexican peso by 20.1%, from a peso—U.S. dollar exchange rate of Ps. 17.2065 to U.S. $1.00 as of December 31, 2015 to a peso—U.S. dollar exchange rate of Ps. 20.6640 to U.S. $1.00 as of December 31, 2016, given that cash inflows are denominated in U.S. dollars and then translated to the reporting currency using the exchange rate at the end of the period, (iii) the change in the period used to estimate long-term prices of proved reserves and the recoverable amount of fixed assets from 20 years to 25 years in accordance with the amendment to the Lineamientos que regulan el procedimiento de cuantificación y certificación de reservas de la nación y el informe de los recursos contingentes relacionados The cash generating units of Pemex Exploration and Production are investment projects in productive fields with hydrocarbon reserves associated with proved reserves (1P). 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. 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: Average crude oil price 60.24 U.S. dollars/bl Average gas price 4.69 U.S. dollars/mpc Average condensates price 40.22 U.S. dollars/bl Discount rate 14.36% annually The total forecast production, calculated with a horizon of 25 years is 7,092 million bpce. 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 (1P). The recoverable amount on each asset is the value in use. Cash Generating Unit of Pemex Industrial Transformation As of December 31, 2016, Pemex Industrial Transformation recognized a net reversal of impairment of Ps. 52,498,881. The net reversal of impairment was in the following cash generating units: Minatitlán Refinery Ps. 33,165,095 Madero Refinery 21,833,892 Arenque gas processor complex 268,161 Reversal of impairment 55,267,148 Cangrejera Petrochemical Center (2,590,870 ) Independencia Petrochemical Center (112,292 ) Matapionche gas processor complex (65,105 ) Total impairment of assets (2,768,267 ) Net reversal of impairment Ps. 52,498,881 As of December 31, 2016, Pemex Industrial Transformation recognized a net reversal of impairment of Ps. 52,498,881 mainly due to (1) a reversal of impairment of Ps. 55,267,148 corresponding to the Madero and Minatitlán refineries due to higher prices than were forecasted in 2015 during the market decline, a decrease in the discount rate in the National Refinery System from 13.72% to 12.06%, and the appreciation of the U.S. dollar against the Mexican peso by 20.1%, from a peso—U.S. dollar exchange rate of Ps. 17.2065 to U.S. $1.00 as of December 31, 2015 to a peso—U.S. dollar exchange rate of Ps. 20.6640 to U.S. $1.00 as of December 31, 2016; (2) a reversal of impairment of the cash generating units of the Arenque gas processor complex of Ps. 268,161 due to an increase in the prices, the appreciation of the U.S. dollar against the Mexican peso and, improved efficiency in operating expenses and (3) impairment of three additional cash generating units, including Ps. (65,105) in the Matapionche gas processor complex, Ps. (2,590,870) in the Cangrejera Petrochemical Center and Ps. (112,292) for the Independencia Petrochemical Center, due to a decrease in the methanol price produced in these petrochemical centers. Cash-generating units 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 or intermediate products that can be processed in another of its cash generating units or by a third party. Each processing center of Industrial Transformation 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. Cash flows determination is made based on PEMEX’s business plans, operating financial programs, forecasts of future prices of products related to the processes of the cash generating units, budget programs and various statistical models that consider historical information of processes and the capacity of the various processing centers. To determine the value in use of long-lived assets associated with the cash-generating units of Pemex Industrial Transformation, the net present value of cash flows was determined based on the following assumptions: Refining Gas Petrochemicals Average crude oil price 52.30 U.S. dollars N.A. N.A. Processed volume 1,100 mbd 3,085 mmpcd or sour gas Variable because the Rate of U.S. dollar Ps.20.6640 mxp/usd Ps.20.6640 mxp/usd Ps.20.6640 mxp/usd Useful lives of the cash generating units Average of 14 years Average of 10 years Average of 4 years Discount rate 12.06% annually 10.72% annually 10.29% annually Period 2018-2034 2018-2029 2016-2024 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 cash flows, taking into consideration the volumes to be produced and sales to be carried out. As of December 31, 2017, the value in use for the impairment or reversal of impairment of fixed assets was as follows: Minatitlán Refinery Ps. 43,856,284 Madero Refinery 33,961,120 Salina Cruz Refinery 36,057,410 Cangrejera Petrochemical Center 2,441,686 Independencia Petrochemical Center 1,706,687 Arenque gas processor complex 473,499 Matapionche gas processor complex 572,909 Total value in use Ps. 119,069,595 Cash generating unit of logistics The cash generating units of PEMEX’s logistics segments are pipelines, tankers, storage terminals and transportation equipment used for service, transport and storage of oil, oil products and petrochemicals. Pemex Logistics calculates the recoverable amount of assets based on the value in use. The value in use for each asset is calculated based on cash flows, taking into consideration services income. As of December 31, 2016, the value in use amounted to Ps. 139,436,715. Until December 31, 2016, the projection of cash flows was calculated based on a period of 5 years. During 2016 the discount rate used was 12.63%. As of December 31, 2016, reversal of impairment amounted Ps. 5,829,520, mainly due to improvements in operating costs. Cash generating unit of ethylene Pemex Ethylene calculates the recoverable amount of assets based on the value in use. The value in use for each asset is calculated based on cash flows, taking into consideration services income. As of December 31, 2016 reversal of impairment amounted to Ps.1,276,510. During 2016 the discount rate used was 10.29%. f. PEMEX entered into certain capital lease arrangements for tankers. These leases expire on various dates until 2018. As of December 31, 2013, PEMEX had entered into nine capital lease arrangements for drilling equipment. These leases expire on various dates over the next 10 years. As of December 31, 2015, PEMEX had entered into certain capital lease arrangements for two offshore platforms. These leases expire on various dates over the next 10 years. As of December 31, 2017 and 2016, assets acquired through these capital leases were as follows: 2017 2016 Investment in tankers and drilling equipment Ps. 11,142,197 Ps. 11,142,197 Less accumulated depreciation (1,696,089 ) (1,274,314 ) Ps. 9,446,108 Ps. 9,867,883 The liabilities relating to the assets listed above are payable in the years following December 31, 2017 as presented below: Year Pesos U.S. dollars 2018 Ps. 1,867,411 94,377 2019 1,192,496 60,268 2020 1,192,496 60,268 2021 1,192,496 60,268 2022 1,192,496 60,268 2023 and thereafter 2,158,559 109,091 8,795,954 444,540 Less: short-term unaccrued interest 331,412 16,749 Less: long-term unaccrued interest 843,480 42,630 Total capital leases 7,621,062 385,161 Less: current portion of leases (excluding interest) 1,543,881 78,026 Total long-term capital leases Ps. 6,077,181 U.S. $ 307,135 The interest expense from capital leases for the years ended December 31, 2017, 2016 and 2015 was Ps. 418,883, Ps. 500,654 and Ps. 450,760, respectively. The discount rates applied to the calculation of capital leases were as follows: i. 7.96 % rate in nominal terms (1.11% in real terms) as of December 31, 2017. ii. 7.96 % rate in nominal terms (4.45% in real terms) as of December 31, 2016. iii. 7.96 % rate in nominal terms (5.71% in real terms) as of December 31, 2015. g. Certain infrastructure assets used for oil and gas activities are guarantees for the U.S. $1,100,000 and U.S. $600,000 sale and lease back agreements dated as of June 17, 2016 and July 8, 2016 (see Note 15). h. PEMEX can conduct exploration and extraction activities through Exploration and Extraction Contracts (EEC). The EECs are awarded individually, through associations or joint ventures based on guidelines approved by the NHC and are classified into: 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, 2017 are: a. Production-sharing contracts i. Hydrocarbon Extraction Contract (Shallow Water), Ek-Balam The object of the contract is the execution of oil activities, under shared production contracts, between, Mexico through the Mexican Government via the NHC and Pemex Exploration and Production, as a contractor, for the contractual area and all the 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 got the 100% of this contractual area. ii. Exploration and Extraction Contract related to Area 2 Tampico Misantla, with the association formed by Pemex Exploration and Production and DEA. The object of the contract is the realization of oil activities, under shared production contracts, by the contractor for the contractual area and all the 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 owns 70% of this contractual area, while DEA has the 30% of this contractual area, respectively. The condition of operator will be in charge of Pemex Exploration and Production. This contract requires a total investment of U.S. $ 45,230 million, of which U.S. $ 36,520 million correspond to exploratory activities to be carried out in the period of 2017-2021. iii. Exploration and Extraction Contract, related to Area 8 Cuencas del Sureste, pursuant to consortium formed by Pemex Exploration and Production and EPC Hidrocarburos México, S. A. de C. V. company (EPC). Pemex Exploration and Production was designated by all the participating companies and with the approval of the NHC 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. b. License contracts i. A licensing contract with BHP Billiton Petróleo Operaciones de México, S. de R.L. (BHP Billiton) for the Trión block, under which BHP Billiton has the right to explore and extract hydrocarbons owned by Mexico in the contractual area and bears the costs and risks associated with such exploration and extraction activities. BHP Billiton owns 60% of the contractual area, while Pemex Exploration and Production owns 40%. ii. Hydrocarbons Exploration and Extraction Contract for the contractual area 3 “Plegado Perdido”, in deep waters, formed by Inpex, Chevron and Pemex Exploration and Production. A licensing contract that permits the exploration and extraction of hydrocarbons owned by Mexico in the contractual area. Chevron was appointed by the participating companies, with the approval of the NHC, as the operator of this contract on behalf of each of the participating companies. Chevron, Pemex Exploration and Production and Inpex have a 33.3334%, 33.3333% and 33.3333% interest in this project, respectively. See below for a condensed statement of comprehensive income and condensed statement of financial position, summarizing the projects listed above: Profit-sharing License As of /For the year ended EK / Balam Block 2 Block 8 Trion Block 3 Total Sales: Net sales Ps. 7,009,464 Ps. — Ps. — Ps. — Ps. — Ps. 7,009,464 Cost of sales 5,447,955 5,953 4,845 — 511 5,459,264 Gross income (loss) 1,561,509 (5,953 ) (4,845 ) — (511 ) 1,550,200 Other income (loss), net 4,852 — — — — 4,852 Administrative expenses 34,338 — — — — 34,338 Operating income (loss) 1,532,023 (5,953 ) (4,845 ) — (511 ) 1,520,714 Taxes, duties and other 158,347 — — — — 158,347 Net income (loss) Ps. 1,373,676 Ps. (5,953 ) Ps. (4,845 ) Ps. — Ps. (511 ) Ps. 1,362,367 Cash and cash equivalents Ps. — Ps. 20 Ps. 25 Ps. — Ps. — Ps. 45 Accounts receivable — 1,013 1,804 — 327 3,144 Total current assets — 1,033 1,829 — 327 3,189 Wells, pipelines, properties, plant and equipment, net 14,869,906 — — 4,498,234 1,107,311 20,475,451 Total assets 14,869,906 1,033 1,829 4,498,234 1,107,638 20,478,640 Suppliers 796,300 — — — — 796,300 Taxes and duties payable 973 — — — — 973 Other current liabilities 4,391 1,809 2,369 — — 8,569 Total current liabilities 801,664 1,809 2,369 — — 805,842 Total liabilities Ps. 801,664 Ps. 1,809 Ps. 2,369 Ps. — Ps. — Ps. 805,842 Equity (deficit), net Ps. 14,068,242 Ps. (776 ) Ps. (540 ) Ps. 4,498,234 Ps. 1,107,638 Ps. 19,672,798

Intangible Assets

Intangible Assets	12 Months Ended
	Dec. 31, 2017
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Intangible Assets	NOTE 13. INTANGIBLE ASSETS At December 31, 2017 and 2016, intangible assets are wells unassigned to a reserve, which amounted Ps. 9,088,563 and Ps. 8,639,242, respectively as follows: 2017 2016 Wells unassigned to a reserve: Balance at the beginning of period Ps. 8,639,242 Ps. 14,304,961 Additions to construction in progress 20,553,952 20,526,300 Transfers against expenses (3,663,986 ) (9,798,246 ) Transfers against fixed assets (16,440,645 ) (16,393,773 ) Balance at the end of period Ps. 9,088,563 Ps. 8,639,242 In addition, as of December 31, 2017 and 2016, PEMEX recognized expenses related to unsuccessful wells of Ps. 2,500,638 and Ps. 19,307,838, respectively, directly in its statement of comprehensive income.

Long-Term Notes Receivable and

Long-Term Notes Receivable and Other Assets	12 Months Ended
	Dec. 31, 2017
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Long-Term Notes Receivable and Other Assets	NOTE 14. LONG-TERM NOTES RECEIVABLE AND OTHER ASSETS a. Long-term notes receivable As of December 31, 2017 and 2016, the balance of long-term notes receivable was as follows: 2017 2016 Promissory notes issued by the Mexican Government Ps . 147,274,076 Ps .140,578,871 Other long-term notes receivable (1) 1,218,833 8,028,731 Total long-term notes receivable Ps . 148,492,909 Ps .148,607,602 (1) For 2016, primarily CENAGAS. Promissory notes issued by the Mexican Government 2017 2016 Total promissory notes Ps .149,796,282 Ps .142,124,620 Less: current portion of notes receivable (1) 2,522,206 1,545,749 Long-term promissory notes Ps .147,274,076 Ps .140,578,871 (1) The current portion of the promissory notes and the total yield payments are allocated under sundry debtors in accounts receivable, net (see Note 7). 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 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 (Development Bonds of the Mexican Government or “BONDES D”). Petróleos Mexicanos then sold the BONDES D to Mexican development banks at market prices. 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 (see Note 21). As of December 31, 2017 and 2016, these promissory notes amounted to Ps. 147,274,076 and Ps. 140,578,871, respectively. PEMEX intends is to hold them to maturity. These promissory notes will be converted into cash with annual maturity dates ranging from 2018 to 2042 and annual rates ranging from 4.65% to 7.03% with annual maturity dates in 2017 and ranging from 2017 to 2042 and annual rates ranging from 4.35% to 7.04% in 2016, as follows: As of December 31, 2017 Number of Promissory Notes Maturity Yield Rate Range Principal Amount 1 2018 4.65% Ps. 2,522,206 1 2019 5.14% 3,580,302 1 2020 5.39% 4,421,320 1 2021 5.57% 5,238,081 1 2022 5.74% 5,804,485 5 2023 to 2027 5.87% to 6.32% 34,196,434 5 2028 to 2032 6.47% to 6.81% 35,338,617 5 2033 to 2037 6.85% to 7.03% 32,789,697 5 2038 to 2042 7.02% to 6.94% 25,905,140 Total promissory notes 149,796,282 Less: current portion Ps. 2,522,206 Long-term notes receivable Ps. 147,274,076 As of December 31, 2016 Number of Promissory Notes Maturity Yield Rate Range Principal Amount 1 2017 4.35% Ps. 1,545,749 1 2018 4.65% 2,408,634 1 2019 5.14% 3,402,849 1 2020 5.39% 4,192,132 1 2021 5.57% 4,957,840 5 2022 to 2026 4.74% a 6.11% 30,986,252 5 2027 to 2031 6.32% a 6.77% 33,280,216 5 2032 to 2036 6.81% a 7.00% 31,370,504 6 2037 to 2042 6.94% a 7.04% 29,980,444 Total promissory notes Ps. 142,124,620 Less: current portion 1,545,749 Long-term notes receivable Ps. 140,578,871 During 2017 and 2016, PEMEX received Ps. 9,233,950 and Ps. 3,597,654, respectively, in accrued yields from these promissory notes, which was recognized as financing income in the consolidated statement of comprehensive income. Yield rates for these promissory notes are pre-determined As of December 31, 2017, the remaining Ps. 22,217,300 corresponding to Ps. 47,000,000 of the Mexican Government contribution was transferred to the Fondo Laboral PEMEX In addition, the promissory note maturing in 2017 was contributed to the FOLAPE in June 2017 in the amount of Ps. 1,562,288. b. Other assets At December 31, 2017 and 2016, the balance of other assets was as follows: 2017 2016 Payments in advance Ps. 4,683,117 Ps. 2,558,767 License 2,162,151 1,813,605 Rights-of-way 1,967,304 1,940,157 Other 2,672,605 3,200,116 Total other assets Ps. 11,485,177 Ps. 9,512,645

Debt

Debt	12 Months Ended
	Dec. 31, 2017
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Debt	NOTE 15. DEBT The Federal Income Law applicable to PEMEX as of January 1, 2017, published in the Official Gazette of the Federation on November 17, 2016, authorized Petróleos Mexicanos and its Subsidiary Entities to incur an internal net debt up to Ps. 28,000,000 and an external net debt up to U.S. $7,100,000. PEMEX can incur additional internal or external debt, as long as the total amount of net debt (Ps. 150,000,000 equivalent to U.S. $8,055,900) does not exceed the ceiling established by the Federal Income Law. On July 8, 2016, the Board of Directors of Petróleos Mexicanos approved policies and general requirements for obligations that constitute public debt of Petróleos Mexicanos and Subsidiary Entities, in accordance with Article 106 section I of the Petroleos Mexicanos Law. Subsequently, the Board of Directors of PEMEX, approved the debt program for fiscal year 2017 in accordance with Article 13 section XXVI of the Petróleos Mexicanos Law. During the period from January 1 to December 31, 2017, PEMEX participated in the following financing activities: a. On February 14, 2017, Petróleos Mexicanos issued € 4,250,000 of debt securities under its Medium-Term Notes Program, Series C in three tranches: (i) € 1,750,000 of its 2.50% Notes due August 2021;(ii) € 1,250,000 of its 3.75% Notes due February 2024; and (iii) € 1,250,000 of its 4.875% Notes due February 2028. b. On April 6, 2017, Petróleos Mexicanos executed a U.S. $132,000, non-revolving c. On May 15, 2017, Petróleos Mexicanos entered into a simple credit line in the amount of U.S. $400,000 at a floating interest rate linked to LIBOR plus 165 basis points, due May 2020 and was used in two tranches of U.S. $200,000 (on May 24, 2017 and July 14, 2017, respectively). d. On June 16, 2017, Petróleos Mexicanos increased its Medium-Term Notes Program, Series C, from U.S. $72,000,000 to U.S. $92,000,000. e. On July 17, 2017, Petróleos Mexicanos entered into a revolving credit facility in the amount of U.S. $1,950,000 and matures in 2020. f. On July 18, 2017, Petróleos Mexicanos issued under its U.S.$92,000,000 Medium-Term Notes Program, Series C: (i) U.S. $2,500,000 of its 6.500% Notes due 2027; and (ii) U.S. $2,500,000 of its 6.75% Bonds due 2047. g. On July 21, 2017, Petróleos Mexicanos consummated a tender offer pursuant to which it purchased U.S. $922,485 aggregate principal amount of its outstanding 5.750% Notes due 2018, U.S. $644,374 aggregate principal amount of its outstanding 3.500% Notes due 2018 and U.S. $172,591 aggregate principal amount of its outstanding 3.125% Notes due 2019. h. On November 16, 2017, Petróleos Mexicanos issued £ 450,000 at a rate interest of its 3.750% Notes due 2025 under its U.S.$92,000,000 Medium-Term Notes Program, Series C. i. On December 15, 2017, AGRO refinanced a credit line for U.S. $390,000, prepaying U.S. $140,000 and entering into a new credit line for the outstanding U.S. $250,000, which bears interest at a floating rate linked to LIBOR plus 250 basis points on a quarterly basis and matures on June 29, 2018. j. On December 18, 2017, Petróleos Mexicanos entered into a bilateral credit line facility in the amount of U.S. $200,000, which bears interest at a floating rate linked to LIBOR plus 165 basis points and matures on December 18, 2020. k. On December 21, 2017, Petróleos Mexicanos borrowed U.S. $300,000 from a bilateral credit line which bears interest at a floating rate linked to LIBOR plus 175 basis points, which matures on December 21, 2022. All the financing activities were guaranteed by Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services. From January 1 to December 31, 2017, PMI HBV obtained U.S. $15,141,500 in financing from its revolving credit line and repaid U.S. $14,914,000. As of December 31, 2017, the outstanding amount under this revolving credit line was U.S. $227,500. As of December 31, 2017, Petróleos Mexicanos had U.S. $6,700,000 and Ps. 23,500,000 in available credit lines in order to ensure liquidity. The available amounts are U.S. $5,400,000 and Ps. 23,500,000, respectively. The Federal Income Law that was applicable to PEMEX as of January 1, 2016, published in the Official Gazette of the Federation on November 18, 2015, authorized Petróleos Mexicanos and its Subsidiary Entities to incur an internal net debt up to Ps. 110,500,000 and an external net debt up to U.S. $8,500,000. PEMEX was entitled to incur additional internal or external debt, as long as the total amount of net debt (Ps.240,550,000 equivalent to U.S. $15,722,000) did not exceed the ceiling established by the Federal Income Law. On November 18, 2014, the Board of Directors of Petróleos Mexicanos approved policies and general requirements for obligations that constitute public debt of Petróleos Mexicanos and Subsidiary Entities, in accordance with the Article 107 of the Petroleos Mexicanos Law. Subsequently, the Board of Directors of PEMEX, approved the debt program for fiscal year 2016 in accordance with Article 13 section XXVI of the Petróleos Mexicanos Law. During 2016, PEMEX participated in the following financing activities: a. On January 25, 2016, Petróleos Mexicanos increased its Medium-Term Notes Program from U.S. $52,000,000 to U.S. $62,000,000. b. On February 4, 2016, Petróleos Mexicanos issued U.S. $5,000,000 of debt securities under its Medium-Term Notes Program, Series C, in three tranches: (i) U.S. $750,000 of its 5.500% Notes due February 2019; (ii) U.S. $1,250,000 of its 6.375% Notes due February 2021; and (iii) U.S. $3,000,000 of its 6.875% Notes due August 2026. All debt securities issued under this program are guaranteed by Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services. c. On February 5, 2016, Petróleos Mexicanos obtained a loan from a line of credit for Ps. 7,000,000,000 bearing interest at a floating rate linked to the TIIE, plus 0.55%, and matured on January 2017. d. On March 15, 2016, Petróleos Mexicanos issued €2,250,000 of debt securities U.S. $62,000,000 Medium-Term Notes Program, Series C in two tranches: (i) €1,350,000 of its 3.750% Notes due to March 2019 and (ii) €900,000 of its 5.125% Notes due to March 2023. All debt securities issued under this program are guaranteed by Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services. e. On March 17, 2016, Petróleos Mexicanos borrowed Ps. 2,000,000 from a credit line at a floating rate linked to TIIE and matured on March 2017. f. On March 17, 2016, Petróleos Mexicanos borrowed Ps. 3,300,000 from a credit line at a floating rate linked to TIIE and matured on March 2017. g. On March 23, 2016, Petróleos Mexicanos issued Ps. 5,000,000 of Certificados Bursátiles due to October 2019 at a floating rate linked to TIIE. As of December 31, 2016, all debt securities issued under this program are guaranteed by Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services. h. On March 28, 2016, Petróleos Mexicanos borrowed Ps. 9,700,000 from a credit line at a floating rate linked to TIIE, and matured on March 2017. i. On April 19, 2016, Petróleos Mexicanos borrowed €500,000 from a credit line at fixed rate of 5.11%, which matures on March 2023. j. On May 31, 2016, Petróleos Mexicanos obtained a U.S. $300,000 bilateral credit line from Export Development Canada (EDC), due on May 2021, which bears interest at a floating rate linked to LIBOR. k. On June 14, 2016, Petróleos Mexicanos issued CHF 375,000 of debt securities under its Medium-Term Notes Program, Series C, in two tranches: (1) CHF 225,000 of its 1.50% Notes due to June 2018 and (2) CHF 150,000 of its 2.35% Notes due to December 2021. The Notes are guaranteed by Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services. l. On June 17, 2016, Pemex Exploration and Production obtained approximately U.S. $1,100,000 in connection with the sale and leaseback of certain infrastructure assets used for oil and gas activities (see Note 12-g). 15-year m. On July 8, 2016, Pemex Industrial Transformation obtained approximately U.S. $600,000 in connection with the sale and leaseback of a plant located in the Madero Refinery. As part of this transaction, Pemex Industrial Transformation entered into a 20-year n. On July 26, 2016, Petróleos Mexicanos issued ¥80,000,000 Bonds at 0.54% due July 2026. The Bonds are guaranteed by the Japan Bank for International Cooperation. o. On September 21, 2016, Petróleos Mexicanos issued U.S. $4,000,000 aggregate principal amount of debt securities under its U.S. $62,000,000 Medium-Term Notes Program, Series C, in two tranches: (i) U.S. $2,000,000 of its 4.625% Notes due to September 2023 and (ii) U.S. $2,000,000 of its 6.750% Bonds due to September 2047. The debt securities are guaranteed by Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services. p. On October 3, 2016, Petróleos Mexicanos consummated a tender and exchange offer pursuant to which it (i) purchased U.S. $687,725 aggregate principal amount of its outstanding 8.000% Notes due 2019 and U.S. $657,050 aggregate principal amount of its outstanding 5.750% Notes due 2018 and (ii) exchanged (a) U.S. $73,288 aggregate principal amount of its outstanding 5.750% Notes due 2018 for U.S. $69,302 aggregate principal amount of its 4.625% Notes due 2023 and U.S. $8,059 aggregate principal amount of its 6.750% Bonds due 2047 and (b) U.S. $1,591,961 aggregate principal amount of its outstanding 5.500% Bonds due 2044 for U.S. $1,491,941 aggregate principal amount of its 6.750% Bonds due 2047. The 4.625% Notes due 2023 and 6.750% Bonds due 2047 are guaranteed by Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services and represent reopenings of the 4.625% Notes due 2023 and 6.750% Bonds due 2047, respectively, originally issued on September 21, 2016 q. On December 6, 2016, Petróleos Mexicanos increased its Medium-Term Notes Program, Series C, from U.S. $ 62,000,000 to U.S. $72,000,000. r. On December 13, 2016, Petróleos Mexicanos issued U.S. $5,500,000 of its debt securities under its Medium-Term Notes Program, Series C in three tranches: (1) U.S. $3,000,000 at fixed rate of 6.50% due March 2027, (2) U.S. $1,500,000 a fixed rate of 5.375% due March 2022, and (3) U.S. $1,000,000 at a floating rate linked to LIBOR, due March 2022. As of December 31, 2016, all debt securities issued under this program are guaranteed by Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services. s. On December 14, 2016, Petróleos Mexicanos entered into a term loan credit facility in the amount of U.S. $300,000 at floating rate linked to LIBOR, matures on December 2019. Between January 1 and December 31, 2016, PMI HBV obtained and paid U.S. $11,369,800 in revolving credit lines. As of December 31, 2016 there was no outstanding amount. As of December 31, 2016, Petróleos Mexicanos had U.S. $4,750,000 and Ps. 23,500,000 in available credit lines in order to ensure liquidity. The available amounts are U.S. $4,630,000 and Ps. 3,500,000, respectively. Various financial transactions (including credit facilities and bond issuances) require compliance with various covenants that, among other things, place restrictions on the following types of transactions by PEMEX, subject to certain exceptions: • The sale of substantial assets essential for the continued operations of its business. • The incurrence of liens against its assets. • Transfers, sales or assignments of rights to payment not yet earned under contracts for the sale of crude oil or natural gas, accounts receivable or other negotiable instruments. As of December 31, 2017 and as of the date of the issuance of these consolidated financial statements, PEMEX was in compliance with the covenants described above. As of December 31, 2017, long-term debt was as follows: Pesos Foreign currency Rate of interest (1) Maturity (thousands) (thousands) U.S. dollars Bonds Fixed from 1.7% to 9.5% and LIBOR plus 0.35% to 3.65% Various to 2047 Ps. 1,138,845,231 US$ Purchasing loans LIBOR plus 0.85% Various to 2018 25,722,710 1,300,000 Project financing Fixed from 2.35% to 3.81% and LIBOR plus 0.24% to 1.75% Various to 2025 64,974,389 3,283,741 Direct loans Fixed from 5.25% to 5.44% and LIBOR plus 1.65% Various to 2020 43,141,231 2,180,315 Syndicated loans LIBOR plus 0.85% Various to 2020 39,347,774 1,988,597 Bank loans Fixed from 3.5% to 5.28% Various to 2023 3,451,629 174,442 Financial leases Fixed from 0.38% to 1.99% Various to 2025 7,621,062 385,161 Lease-back (See Financing activities for 2016 l) and m)) (4) Fixed from 0.45% to 0.7% Various to 2036 32,677,268 1,651,476 Total financing in U.S. dollars 1,355,781,294 US$ 68,519,829 Euros Bonds Fixed from 1.875% to 5.5% Various to 2030 287,386,195 € 12,097,975 Project financing Fixed from 2.1% to 5.11% Various to 2023 11,879,379 500,081 Total financing in Euros 299,265,574 € 12,598,056 Japanese yen: Bonds Fixed from 0.54% to 3.5% and LIBOR yen plus 0.75% Various to 2026 30,541,407 ¥ 173,827,018 Pesos Certificados bursátiles Mexican Government Treasury Certificates (“Cetes”) , TIIE (1) Various to 2026 Ps. 149,564,918 Direct loans Fixed at 6.55% and TIIE plus 0.85% to 1.25% Various to 2025 28,597,423 Syndicated loans TIIE plus 0.95 Various to 2025 33,646,107 Total financing in pesos Ps. 211,808,448 Unidades de Inversión Certificados bursátiles Certificados bursátiles Zero rate and Fixed at 3.02% to 5.23% Various to 2035 57,197,211 Other currencies: Bonds Fixed from 1.5% to 8.25% Various to 2025 47,148,936 Total principal in pesos (2) 2,001,742,870 Plus: accrued interest 32,078,624 Notes payable to contractors (3) 4,053,577 Total principal and interest 2,037,875,071 Less: short-term maturities 122,957,558 Current portion of notes payable to contractors (3) 2,173,285 Accrued interest 32,078,624 Total short-term debt and current portion of long-term debt 157,209,467 Long-term debt (Note 16(c)) Ps. 1,880,665,604 As of December 31, 2016, long-term debt was as follows: Rate of interest (1) Maturity Pesos (thousands) Foreign currency U.S. dollars Bonds Fixed from 3.125% to 9.5% and LIBOR plus 0.35% to 2.02% Various to 2046 Ps. 1,131,389,914 U.S. $ 54,751,738 Purchasing loans LIBOR plus 0.8% to 0.85% Various to 2016 2,479,680 120,000 Project financing Fixed from 2.35% to 5.45% and LIBOR plus 0.01% to 1.71% Various to 2021 84,711,684 4,099,481 Direct loans Fixed at 5.44% and LIBOR plus 1.0% Various to 2018 33,100,587 1,601,848 Syndicated loans LIBOR plus 0.85% Various to 2020 41,056,571 1,986,865 Bank loans Fixed from 3.5% to 5.28% Various to 2023 4,339,826 210,019 Financial leases Fixed from 0.38% to 1.99% Various to 2025 9,559,060 462,595 Lease-back (See Financing activities for 2016 l) and m)) (4) Fixed from 0.45% to 0.7% Various to 2036 35,513,114 1,718,598 Total financing in U.S. dollars 1,342,150,436 U.S. $ 64,951,144 Euros Bonds Fixed from 3.125% to 6.375% Various to 2030 196,317,016 € 9,058,388 Project financing Fixed at 2% Various to 2016 10,836,200 500,000 Total financing in Euros 207,153,216 € 9,558,388 Japanese yen: Bonds Fixed at 3.5% and LIBOR yen plus 0.75% Various to 2023 30,800,746 ¥ 173,809,300 Project financing Fixed at 1.56% and Prime Rate yen plus 2.56% Various to 2017 517,286 2,919,056 Total financing in yen 31,318,032 ¥ 176,728,356 Pesos Certificados bursátiles Mexican Government Treasury Certificates (“Cetes”) , TIIE (1) Various to 2026 Ps. 173,151,985 Direct loans Fixed at 6.55% and TIIE plus 0.55% to 1.25% Various to 2025 45,563,848 Syndicated loans TIIE plus 0.95 Various to 2025 38,538,961 Revolved loans TIIE plus 0.55 To 2016 20,000,000 Total financing in pesos Ps. 277,254,794 Unidades de Inversión Certificados bursátiles Certificados bursátiles Zero rate and Fixed at 3.02% to 5.23% Various to 2035 53,703,421 Other currencies: Bonds Fixed from 2.5% to 8.25% Various to 2022 36,786,665 Total principal in pesos (2) 1,948,366,564 Plus: accrued interest 27,815,467 Notes payable to contractors (3) 6,988,699 Total principal and interest 1,983,170,730 Less: short-term maturities 144,169,619 Current portion of notes payable to contractors (3) 4,181,102 Accrued interest 27,815,467 Total short-term debt and current portion of long-term debt 176,166,188 Long-term debt (Note 16(c)) Ps. 1,807,004,542 (1) As of December 31, 2017 and 2016, interest rates were as follows: 3 month LIBOR of 1.69428% and 0.99789%, respectively; 6 month LIBOR of 1.83707% and 1.31767%, respectively; TIIE rate of 7.6241% and 6.1066%, respectively, for 28 days; TIIE rate of 7.6556% and 6.1875%, respectively, for 91 days; Cetes rate of 7.22% and 5.69%, respectively, for 28 days; Cetes rate of 7.36% and 5.96%, respectively, for 91 days; Cetes rate of 7.53% and 6.09%, respectively, for 182 days. (2) Includes financing from foreign banks of Ps. 1,701,363,406 and Ps. 1,600,968,832, as of December 31, 2017 and 2016, respectively. (3) The total amounts of notes payable to contractors as of December 31, 2017 and 2016, current and long-term, are as follows: 2017 2016 Total notes payable to contractors (a)(b) Ps.4,053,577 Ps.6,988,699 Less: current portion of notes payable to contractors 2,173,285 4,181,102 Notes payable to contractors (long-term) Ps.1,880,292 Ps.2,807,597 (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, 2017 and 2016, PEMEX had an outstanding amount payable of Ps. 1,678,843 and Ps. 3,986,565, 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, 2017 and 2016, the outstanding balances owed to the contractor were Ps. 2,374,734 (U.S. $120,017) and Ps. 3,002,134 (U.S. $145,283), respectively. In accordance with the contract, the estimated future payments are as follows: Year Amount 2018 U.S.$ 25,267 2019 25,267 2020 25,267 2021 25,267 2022 18,949 Total U.S $ 120,017 (4) PEMEX obtained financing through the sale and leaseback of certain infrastructure assets and a plant, which will require periodic payments through 2036. This transaction was recognized as a financing activity due to the fact that PEMEX retained all of the risks and benefits associated with ownership of the asset and substantially all of the operating rights to the assets. The outstanding liability for this transaction is payable as follows: Years Pesos U.S. dollars 2018 Ps. 3,957,317 U.S. $ 199,999 2019 3,886,037 196,396 2020 3,886,037 196,396 2021 3,886,037 196,396 2022 3,886,037 196,396 2023 and thereafter 39,450,325 1,993,781 58,951,790 2,979,364 Less: short-term unaccrued interest 2,399,475 121,267 Less: long-term unaccrued interest 23,875,047 1,206,621 Total financing 32,677,268 1,651,476 Less: short-term portion of financing (excluding interest) 1,557,842 78,732 Total long term financing Ps. 31,119,426 U.S.$ 1,572,744 (5) As of December 31, 2017 and 2016, PEMEX used the following exchange rates to translate the outstanding balances in foreign currencies to pesos in the statement of financial position: 2017 2016 U.S. dollar Ps. 19.7867 Ps. 20.6640 Japanese yen 0.1757 0.1772 Pounds sterling 26.7724 25.3051 Euro 23.7549 21.6724 Swiss francs 20.2992 20.1974 Canadian dollar 15.7858 15.2896 Australian dollar 15.4752 14.8842 2018 2019 2020 2021 2022 2023 and thereafter Total Maturity of the total principal outstanding and accrued interest as of December 31, 2017, for each of the years ending December 31. Ps.157,209,467 Ps.159,403,397 Ps,209,915,748 Ps.185,307,669 Ps.158,761,145 Ps.1,167,277,645 Ps.2,037,875,071 The following table presents the roll-forward of total debt of PEMEX for each of the year ended December 31, 2017 and 2016, which includes short and long-term debt: 2017 (i) 2016 (i) Changes in total debt: At the beginning of the year Ps.1,983,170,730 Ps.1,493,381,835 Cash flows: Loans obtained—financing institutions 704,715,468 829,579,084 Loans obtained—financing lease — 21,924,053 Debt payments (642,059,819 ) (614,987,329 ) Interest paid (108,910,417 ) (88,757,428 ) Non-cash Foreign exchange (16,685,439 ) 243,182,764 Accrued interest 117,644,548 98,847,751 At the end of the year Ps.2,037,875,071 Ps.1,983,170,730

Derivative Financial Instrument

Derivative Financial Instruments	12 Months Ended
	Dec. 31, 2017
Text block1 [abstract]
Derivative Financial Instruments	NOTE 16. 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 derivative financial instruments (“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. 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. One of PEMEX’s policies is to contribute minimizing the impact that unfavorable changes in financial risk factors have on its financial results by promoting an adequate balance between expected 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 in its internal procedures the eligible counterparties to 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. In addition, PMI Trading also has its own risk management subcommittee that supervises the trading of DFIs. Given that PEMEX’s outstanding DFIs have been entered into for risk mitigation purposes, particularly with economic hedging purposes, it is unnecessary 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 limits such as VaR and capital at risk (an aggregation of fair value or mark-to-market 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 include collateral exchange clauses. Notwithstanding, PEMEX’s regulatory framework promotes credit risk mitigation strategies such as collateral exchange 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, 2017, approximately 15.6% of PEMEX’s total net debt outstanding 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. Under its interest rate swap agreements, PEMEX acquires the obligation to make payments based on a fixed interest rate and is entitled to receive floating interest rate payments based on LIBOR, TIIE or a rate referenced to or calculated from TIIE. As of December 31, 2017, PEMEX was a party to four interest rate swap agreements denominated in U.S. dollars for an aggregate notional amount of U.S. $1,623,750 at a weighted average fixed interest rate of 2.35% and a weighted average term of 7.3 years. Similarly, in order to eliminate the volatility associated with variable interest rates of long-term financing operations, PMI NASA has executed interest rate swap agreements denominated in U.S. dollars for an aggregate notional amount of U.S. $71,936, at a weighted average fixed interest rate of 4.17% and a weighted average term of 4.41 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. 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. Therefore, 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 appropriate. The underlying currencies of PEMEX’s DFIs are the euro, Swiss franc, Japanese yen, Pound sterling and Australian dollar versus the U.S. dollar and UDIs versus the peso. In 2017, PEMEX entered into various cross-currency swaps to hedge inflation risk arising from debt denominated in UDIs, for an aggregate notional amount of Ps. 6,291,969. During 2016, PEMEX entered into the same kind of instruments to hedge currency risk arising from debt obligations denominated in euros and Swiss francs for an aggregate notional amount of U.S. $3,459,236 and the inflation risk arising from debt denominated in UDIs, for an aggregate notional amount of Ps. 1,077,101. Most of PEMEX’s cross-currency swaps are plain vanilla except for one swap entered into in 2004 to hedge its exposure to the euro, which expired in 2016. This swap was referred to as an “extinguishing swap” and was obtained in order to hedge long-term obligations. The main characteristic of extinguishing swaps was that these DFIs terminate upon the occurrence of any of the credit default events specified in the DFI contract confirmation, without any payment obligation for either party. This swap had a notional amount of U.S. $1,146,410. In 2016, PEMEX entered into, without cost, an options structure called “Seagull Option” in order to cover the notional risk of a debt issue in Japanese yen for ¥80,000,000, keeping the coupons in the original currency (0.5% annual coupon rate). This structure protects the short exposure in Japanese yen against an appreciation of the Japanese yen versus the U.S. dollar from JPY 83.70 and up to JPY 75.00 and recognizes a benefit if the Japanese yen depreciates to an average of 117.39 JPY/USD. Moreover, in 2017 PEMEX entered into, without cost, three more Seagull Options to hedge the notional risk of three debt issues in euros for an aggregate notional amount of € 4,250,000. These structures protect the short exposure in euros against an appreciation of the euro versus the U.S. dollar in a specific range, and PEMEX recognizes a benefit if the euro depreciates up to a certain exchange rate, for each debt issue. Whereas, in order to mitigate the exchange rate risk caused by the coupons of these issues PEMEX entered into coupon-only swaps. Additionally, PEMEX entered into, without cost, a structure which is composed of a cross-currency swap and the sale of a call option, in order to hedge the notional risk of a debt issue in Pound sterling for £450,000, guaranteeing complete protection up to a certain exchange rate and partial protection above that level. PEMEX recorded a total net foreign exchange gain (loss) of Ps. 23,184,122, Ps. (254,012,743) and Ps. (154,765,574), for the years ended December 31, 2017, 2016 and 2015, respectively; these amounts include the unrealized foreign exchange gain (loss) associated with debt of Ps. 16,685,439, Ps. (243,182,764) and Ps. (152,554,454) for the years ended December 31, 2017, 2016 and 2015, respectively. The appreciation of the peso caused a total net foreign exchange gain because a significant part of PEMEX’s debt, 89.4% (principal only), as of December 31, 2017 is denominated in foreign currency. Unrealized foreign exchange gains and losses 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 no more than 5% of a company’s total financial assets may be denominated in a currency other than its functional currency, unless the company owes a duty or expected payment in a currency other than its functional one. Accordingly, certain PMI subsidiaries will, from time to time, enter into DFIs in order to mitigate the risk associated with financing operations denominated in currencies other than their respective functional currency. 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 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 continuously evaluates the implementation of risk mitigation strategies, including those involving the use of DFIs, while taking into account operational and economic constraints. PEMEX’s exposure to hydrocarbon prices is partly mitigated by natural hedges between its inflows and outflows. Since 2016, as a result of the changes in the PEMEX’s fiscal regime, its sensitivity to crude oil prices decreased. Nonetheless, PEMEX worked on a hedging strategy for the following years in order to reduce its exposure to drops in crude oil price. In April 2017, PEMEX entered into a crude oil hedge to partially protect its cash flows from decreases in the Mexican crude oil basket price below that established in the Ley de Ingresos de la Federación During the fourth quarter of 2017, PEMEX entered into a crude oil hedge to partially protect cash flows for the fiscal year 2018 from decreases in the Mexican crude oil basket price below the one established in the 2018 Federal Revenue Law. PEMEX hedged 440 thousand barrels per day from January to December 2018 for U.S. $449,898. In 2015, PEMEX entered into various swaps in order to hedge the risk arising from the variations of the propane price of its imports. These DFIs were held over a percentage of the total imports volume with maturity dates in 2015. During 2017 and 2016, PEMEX did not enter into any propane import price swaps. In addition to supplying natural gas, Pemex Industrial Transformation offers DFIs to its domestic customers in order to provide them with support to mitigate the risk associated with the volatility of natural gas prices. Until 2016, Pemex Industrial Transformation entered into DFIs with Mex Gas Supply, S.L. under the opposite position to those DFIs offered to its customers in order to mitigate the market risk it bears under such offered DFIs. Mex Gas Supply, S.L. then transferred the related price risk derived from the DFI position held with Pemex Industrial Transformation to international financial counterparties by entering into these opposite position DFIs with such parties. As of 2017, Pemex Industrial Transformation must enter into DFIs with Petróleos Mexicanos under the opposite position to those DFIs offered to its customers, thereby replacing Mex Gas Supply, S.L. However, as of December 31, 2017, no DFIs have been entered into under this mechanism. Due to the above, Pemex Industrial Transformation maintains a negligible or even null exposure to market risk. These portfolios have VaR and Capital at Risk 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. iv. Risks relating to the portfolio of third-party shares As of December 31, 2017, Petróleos Mexicanos does not hold any third-party shares of companies that do not participate in financial markets and, therefore, does not hold any related DFIs. During 2017, PMI HBV liquidated the total shareholding in Repsol, S.A. (Repsol), which was 23,416,219 shares. Therefore, as of December 31, 2017, PEMEX does not hold any third-party shares and does not hold any related DFIs. v. 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, 2017, the VaR of PEMEX’s investment portfolios was Ps. (10.82) for the Peso Treasury Portfolio, Ps. (44.95) for the Fondo Laboral Pemex Portfolio (“FOLAPE”), Ps. (7.17) for the Fideicomiso de Cobertura Laboral y de Vivienda Portfolio (“FICOLAVI”), Ps. (544.32) for the Mexican Peso Treasury Portfolio managed by Operadora de Fondos Nafinsa, S.A. de C.V. (“OFINSA”), and U.S. $0 for the U.S. Dollar Treasury Portfolio. In addition to the exposure to interest rate fluctuations of the DFIs in which PEMEX is obligated to pay floating rates, PEMEX’s DFIs are exposed to 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 Sensitivity in thousands U.S. dollars CHF 3,144 (3,144 ) — 3,030 Euro 100,081 (84,962 ) 15,119 82,839 Pound Sterling 7,691 (7,073 ) 618 6,587 Yen 8,542 (3,972 ) 4,570 6,877 Peso 43,774 2,039 45,813 42,012 UDI 16,496 (11,586 ) 4,910 15,453 U.S. dollar 785,508 89,880 875,388 416,052 FX swaps were included in the calculation of the figures in the previous table, which were not traded as debt hedging. In addition, PEMEX performed a retrospective sensitivity analysis of the impact on its financial statements for the years ended December 31, 2017, 2016 and 2015, 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, 2017, 2016 and 2015, had market interest rates been 25 basis points higher, with all other variables remaining constant, net income for the year would have been Ps. 704,011, Ps. 841,024 and Ps. 922,268 lower for December 31, 2017, 2016 and 2015, respectively, primarily as a result of an increase in interest expense. Conversely, had market interest rates been 25 basis points lower, net income for the year would have been Ps. 704,011, Ps. 841,024 and Ps. 922,268 greater at December 31, 2017, 2016 and 2015, 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 mark-to-market 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 Interbank Yield Curves PEMEX Curves Currency 1% 1% 1% VaR 95% in thousands U.S. dollars CHF (13,943 ) 13,943 — — (13,624 ) Euro (187,988 ) 165,894 (22,094 ) (19,744 ) (167,068 ) Pound Sterling (13,822 ) 13,042 (780 ) (666 ) (12,322 ) Yen (16,914 ) 11,470 (5,444 ) (4,398 ) (14,859 ) Peso (135,974 ) 1,409 (134,565 ) (162,336 ) (133,525 ) UDI (29,485 ) 25,358 (4,127 ) (5,038 ) (28,573 ) 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 euro, Pound sterling and Japanese yen is result of the delta of the structures described above (Seagull Options and Calls). FX swaps which were not traded as part of debt hedging were included in the calculation of the figures in the table above. In addition, PEMEX performed a retrospective sensitivity analysis of the impact on its financial statements of the years ended December 31, 2017, 2016 and 2015, 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, 2017, 2016 and 2015, had the peso depreciated against the U.S. dollar by 10% with other variables remaining constant, net income would have been Ps.149,669, Ps.124,512 and Ps.105,915 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.149,669, Ps.124,512 and Ps.105,915, 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, 2017, Pemex Industrial Transformation’s natural gas DFI portfolio had no market risk exposure. Market risk exposure is 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. $(8,789) as of December 31, 2017. 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 with its counterparties to a specific threshold amount. The specified thresholds were reached in three cross-currency swaps from the first to the fourth quarter of 2017, which were used to hedge the exchange rate exposure to the euro and in five cross-currency swaps during 2016, which were used to hedge the exchange rate exposure to the Pound sterling. This resulted in the cash settlement of such swaps and the resetting of swap terms to return their mark-to-market In addition, during 2016 PEMEX 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, 2017, PEMEX has entered into three euro swaps and two Japanese yen Seagull Option structures, with termination clauses in 2018 and 2021, respectively. 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. In accordance with market best practices, 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 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 year 1-3 3-5 5-7 7-10 years More than 10 years in thousands U.S. dollars A 257,424 976,230 1,298,110 1,314,296 578,548 482,959 — A- 138,850 235,594 191,681 228,801 223,751 257,465 — BBB+ 310,705 1,010,356 1,540,015 1,349,311 1,243,898 1,115,559 78,831 BBB 2,183 18,626 20,064 18,092 — — — PEMEX also faces credit risk derived from its investments. As of December 31, 2017, the notional amounts of investments in domestic currency, organized by the credit ratings of the issuances, were as follows: Credit rating of issuances* Notional amount mxAAA Ps. 811,548 mxAA 200,876 mxA 271,275 * Minimum S&P, Moody’s and Fitch credit rating. National Credit Rating Scale. Does not include investments in Mexican Government bonds. The table above does not include domestic currency Mexican Government bonds because these issuances are considered not to carry default risk in this currency. PEMEX held an investment in a note linked to United Mexican States’ credit risk that was issued by a U.S. financial institution with a BBB+ credit rating. This note matured in June 2016 and had a face value of U.S. $108,000. As of December 31, 2017, PEMEX does not hold an investment in structured notes. Furthermore, by means of its credit guidelines for DFI operations, Pemex Industrial Transformation has significantly reduced its credit risk exposure related to the DFIs offered to its customers to assist them in mitigating the risk associated with the volatility of natural gas. 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, beginning on October 2, 2009, DFIs with these customers must be initially secured by cash deposits, letters of credit or other collateral provisions, as required. In accordance with these guidelines, in the event that a client does not meet its payment obligations, DFIs related to this client are terminated, rights to collateral are exercised and, if the collateral is insufficient to cover the fair value, natural gas supply is suspended until the payment is made. On August 20, 2014, certain amendments to the credit guidelines were enacted, which allowed Pemex-Gas As of December 31, 2017, Pemex Industrial Transformation’s DFIs had a fair value of U.S. $1,464 (deferred premiums included) for clients with exempted credit lines and U.S. $8,183 for clients with guaranteed credit lines. The total amount of exempt credit lines rose to U.S. $117,956, representing 1% usage of available exempt credit lines, while the total amount of guaranteed credit lines rose to U.S. $930,199, representing a 1% usage of available guaranteed credit lines. As of December 31, 2017, the overdue accounts of natural gas customers in the industrial and distribution sectors accounted for less than 1.00% of the total sales of Pemex Industrial Transformation. As of December 31, 2017, Pemex Industrial Transformation had open DFIs with 8 customers. Of the total volume (in millions of British thermal units or MMBtu) of DFIs, industrial customers represented 100%. As of December 31, 2017 and 2016, Pemex Industrial Transformation had not provided any collateral for DFIs entered into to hedge its DFIs with customers. This was due to the following: (i) natural gas prices maintained levels below the strike price, which has kept the credit limits within the set limits; and (ii) when certain DFIs matured, Pemex-Gas The potential future exposure of Mex Gas Supply, S.L.’s DFI portfolio was calculated in an analogous manner to the analysis of Petróleos Mexicanos’ DFI positions. The current and potential exposure, aggregated by credit rating, is as follows: Maximum Credit Exposure by term in Pemex Industrial Transformation Rating Current Less than 1 year 1-3 years 3-5 years 5-7 years 7-10 years More than 10 years in thousands U.S. dollars A 27 27 — — — — — A- 541 541 306 — — — — BBB+ 25 25 1 — — — — 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 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. In order to preserve a cash balance at a suitable level, in December of 2017, PEMEX entered into ten FX swaps of the peso against U.S. dollar for an aggregate amount of U.S. $3,000,000. In addition, PEMEX has acquired committed revolving credit lines in order to mitigate liquidity risk, two of which provide access to Ps. 3,500,000 and Ps. 20,000,000 with expiration dates in June and November 2019, respectively; and three others that each provide access to U.S. $1,500,000, U.S. $3,250,000 and U.S. $1,950,000 with expiration dates in December 2019, February 2020 and January 2021, respectively. 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 or “in-house These companies monitor their cash flow on a daily basis and protect their creditworthiness in the financial markets. Liquidity risk is mitigated by monitoring the maximum/minimum permissible financial ratios as set forth in the policies approved by each company’s board of directors. The following tables show the cash f

Employee Benefits

Employee Benefits	12 Months Ended
	Dec. 31, 2017
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Employee Benefits	NOTE 17. 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 Subsidiary Entities also has a defined contribution pension plan, in which both Petróleos Mexicanos and 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 of December 31, 2017, 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 to the same line item and the interests, dividends or capital gains obtained from the investments of the trusts. The following table show the amounts associated with PEMEX’s labor obligations: December 31, Defined Benefits Liabilities 2017 2016 Liability for defined benefits at retirement and post-employment at the end of the year Ps. 1,241,072,307 Ps. 1,202,624,665 Liability for other long-term benefits 17,363,815 17,784,771 Total liability for defined benefits recognized in the consolidated statement of financial position at the end of the year Ps. 1,258,436,122 Ps. 1,220,409,436 The following tables contain detailed information regarding PEMEX’s retirement and post-employment benefits: December 31, Changes in the liability for defined benefits 2017 2016 Liability for defined benefits at the beginning of the year Ps. 1,202,624,665 Ps. 1,258,480,019 Recognition of the modifications in pensions plan 8,327 (571,713 ) Current Service cost 13,079,341 23,111,918 Net interest 95,402,917 90,527,624 Past service costs — (33,244 ) Defined benefits paid by the fund (5,105,669 ) (4,892,767 ) Actuarial (gains) losses in other comprehensive results due to: Change in financial assumptions 47,182,448 (149,533,263 ) Change in demographic assumptions (70,012,604 ) 4,842,109 For experience during the year 10,272,231 36,103,857 In plan assets during the year (453,206 ) 285,123 Remeasurements 26,417 (1,742 ) Contributions paid to the fund (51,952,560 ) (55,693,256 ) Defined benefit liabilities at end of year Ps. 1,241,072,307 Ps. 1,202,624,665 In 2017 and 2016, the net actuarial gains recognized in other comprehensive income (loss) net of income deferred tax were Ps. 12,038,710 and Ps. 106,387,640, respectively, related to retirement and post-employment benefits, not including the normal year to year increase in obligations based on changes in population, age, seniority, wages, pensions and benefits. The decrease in losses in 2017 was mainly due to the decrease in the discount and return on plan assets rates, from 8.17% in 2016 to 7.89% in 2017. December 31, Changes in pension plan assets 2017 2016 Plan assets at the beginning of year Ps. 9,489,666 Ps. 5,228,909 Return on plan assets 902,550 742,477 Payments by the pension fund (54,312,270 ) (51,889,821 ) Company contributions to the fund (1) 51,952,559 55,693,256 Actuarial (gains) losses in plan assets 453,187 (285,155 ) Pension plan assets at the end of year Ps. 8,485,692 Ps. 9,489,666 (1) Includes proceeds from the collected amounts of the Promissory Notes, contributed by the Mexican Government (See Note 14). PEMEX’s plan assets are held in two trusts, the FOLAPE and the Fideicomiso de Cobertura Laboral y de Vivienda (FICOLAVI), 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. The expected contribution to the fund for 2018 amounts to Ps. 63,500,000 and the expected payments for 2018 is Ps. 62,337,560. As of December 31, 2017 and 2016, the amounts and types of plan assets are as follows: December 31, Plan Assets 2017 2016 Cash and cash equivalents Ps. 135,757 Ps. 5,906,660 Equity instruments 1,034,178 2,694,291 Debt instruments 7,315,757 888,715 Total plan assets Ps. 8,485,692 Ps. 9,489,666 December 31, Changes in Defined Benefit Obligations (DBO) 2017 2016 Defined benefit obligations at the beginning of the year Ps. 1,212,114,331 Ps. 1,263,708,928 Service costs 19,762,661 23,107,851 Financing costs 96,331,015 91,270,383 Past service costs (33,244 ) Payments by the fund (59,417,940 ) (56,778,359 ) Amount of (gains) and losses recognized through other comprehensive income: (12,594,541 ) (108,589,515 ) Modifications to the pension plan (6,609,657 ) (571,713 ) Remeasurements (1,471 ) — Reductions (26,399 ) — Defined benefit obligations at the end of year Ps. 1,249,557,999 Ps. 1,212,114,331 The asset ceiling test was not applied because there was a deficit of labor liabilities at the beginning and end of the year. The effect of an increase or decrease of one percentage point in the discount rate is a -12.46% 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 21.93% increase or a -16.80% Assumptions regarding future mortality are based on EMSSA2009 to Unique Circular of the Comisión Nacional de Seguros y Fianzas (National Commission of Insurance and Bonds) and include changes to the mortality rate established in 2017. The following tables present additional fair value disclosure about plan assets and indicate their rank, in accordance with IFRS 13, as of December 31, 2017 and 2016: Fair value measurements as of December 31, 2017 Plan assets Quoted prices Significant Significant Total Cash and cash equivalents Ps. 135,757 Ps. — Ps. — Ps. 135,757 Equity instruments 1,034,178 — — 1,034,178 Debt instruments 7,315,757 — — 7,315,757 Total Ps. 8,485,692 Ps. — Ps. — Ps. 8,485,692 Fair value measurements as of December 31, 2016 Plan assets: Quoted prices Significant Significant Total Cash and cash equivalents Ps. 5,906,660 Ps. — Ps. — Ps. 5,906,660 Equity instruments 2,694,291 — — 2,694,291 Debt instruments 888,715 — — 888,715 Total Ps. 9,489,666 Ps. — Ps. — Ps. 9,489,666 As of December 31, 2017 and 2016, the principal actuarial assumptions used in determining the defined benefit obligation for the plans are as follows: December 31, 2017 2016 Rate of increase in salaries 4.77 % 4.77 % Rate of increase in pensions 3.75 % 3.75 % Rate of increase in medical services 7.65 % 7.65 % Inflation assumption 3.75 % 3.75 % Discount and return on plan assets rate 7.89 % 8.17 % Average length of obligation (years) 18.40 17.67 In accordance with IAS 19, the discount rate used is determined by considering the government zero coupon curve generated from the fixed rate bonds issued by the Mexican Government (“Bonds M”) and Cetes, as well as the flow of payments expected to cover contingent liabilities. Other long-term benefits Petróleos Mexicanos and Subsidiary Entities has established other long-term benefit plans for its employees, to which employees do not contribute, which correspond to the seniority premiums payable for disability, death and survivors 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, 2017 and 2016 are as follows: December 31, Change in the liability for defined benefits 2017 2016 Liabilities defined benefit at the beginning of year Ps. 17,784,771 Ps. 20,905,422 Charge to income for the year 3,277,847 3,420,158 Actuarial (gains) losses recognized in income due to: Change in financial assumptions 878,516 (3,028,211 ) Change in demographic assumptions (1,015,274 ) (119,982 ) For experience during the year (3,558,599 ) (3,390,396 ) Benefits paid (3,446 ) (2,220 ) Liabilities defined benefit at the end of year Ps. 17,363,815 Ps. 17,784,771 The principal actuarial assumptions used in determining the defined benefit obligation for the plans are as follows: December 31, 2017 2016 Rate of increase in salaries 4.77 % 4.77 % Inflation assumption 3.75 % 3.75 % Discount and return on plan assets rate 7.89 % 8.17 % Average length of obligation (years) 18.40 17.67 In accordance with IAS 19, the discount rate used is determined by considering the government zero coupon curve generated from Bonds M and Cetes, as well as the flow of payments expected to cover contingent liabilities.

Provisions for Sundry Creditors

Provisions for Sundry Creditors	12 Months Ended
	Dec. 31, 2017
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Provisions for Sundry Creditors	NOTE 18. PROVISIONS FOR SUNDRY CREDITORS At December 31, 2017 and 2016, the provisions for sundry creditors and others is as follows: 2017 2016 Provision for plugging of wells (Note 12) Ps. 68,797,600 Ps. 64,967,710 Provision for trails in process (Note 25) 7,812,689 15,119,692 Provision for environmental costs 11,067,134 8,230,476 Ps. 87,677,423 Ps. 88,317,878 The following tables show the allowance account for plugging of wells, trials in progress and environmental costs: Plugging of wells 2017 2016 Balance at the beginning of the year Ps. 64,967,710 Ps. 56,894,695 Decrease capitalized in fixed assets (3,791,482 ) (3,878,503 ) Unwinding of discount against income 7,774,000 11,968,966 Amount used (152,628 ) (17,448 ) Balance at the end of the year Ps. 68,797,600 Ps. 64,967,710 Trials in progress 2017 2016 Balance at the beginning of the year Ps. 15,119,692 Ps. 12,775,263 Additions against income 2,835,357 3,049,202 Provision cancellation (1,973,153 ) (632,806 ) Amount used (8,169,207 ) (71,967 ) Balance at the end of the year Ps. 7,812,689 Ps. 15,119,692 Environmental costs 2017 2016 Balance at the beginning of the year Ps. 8,230,476 Ps. 3,521,838 Additions against income 3,203,982 6,118,454 Provision cancellation (312,937 ) (1,347,285 ) Amount used (54,387 ) (62,531 ) Balance at the end of the year (1) Ps. 11,067,134 Ps. 8,230,476 (1) PEMEX is subject to the provisions of the Ley General del Equilibrio Ecológico y la Protección al Ambiente Procuraduría Federal de Protección al Ambiente 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. Present value is determined based on discount rates ranging from 4.0% to 10.5% in 2017. 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. 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.

Disclosures of Cash Flow

Disclosures of Cash Flow	12 Months Ended
	Dec. 31, 2017
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Disclosures of Cash Flow	NOTE 19. DISCLOSURES OF CASH FLOW The following items represent non-cash For the years ended December 31, 2017 2016 2015 Operating activities Employee benefits equity effect (i) Ps. 12,038,710 Ps. 106,277,761 Ps. 78,556,569 Net (benefits) cost of the year for employee benefits (i) 108,073,074 109,738,416 (62,549,142 ) Investing activities (ii) Available-for-sale 5,564,130 207,817 (3,206,316 ) Financing activities Financed Public Works Contracts — 146,217,292 2,001,093 Currency translation effect (7,597,283 ) 21,386,902 13,262,101 Accrued interest 8,734,131 9,326,945 4,816,784 (i) Items that do not impact cash flows but that reflect the actuarial valuation at the end of the year. (ii) Non-cash investing transactions are included in Note 12-d. Material changes in liabilities from financing activities are disclosed in Note 15.

Income Taxes and Federal Duties

Income Taxes and Federal Duties	12 Months Ended
	Dec. 31, 2017
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Income Taxes and Federal Duties	NOTE 20. INCOME TAXES AND FEDERAL 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, 2017 and 2016, the applicable rate of this duty was 67.50% and 68.75% 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 decreases on an annual basis. As of January 1, 2019, this duty will be set at 65%. During 2017, this duty totaled Ps. 372,902,629 from annual payments presented on March 31, 2018 paid as follows: Ps. 377,192,377, in monthly installment payments and a favorable balance amounting to Ps. 4,289,748, presented in accounts receivable, net line item in the statement of financial position. During 2016, this duty totaled Ps. 304,299,019 from annual payments presented on April 3, 2017 paid as follows: Ps. 301,050,325, in monthly installment payments and a payable balance amounting to Ps. 3,248,694. The accounting result differs from the tax result mainly due to differences in depreciation, non-deductible Total DUC and other as of December 31, 2017 and 2016 are integrated as follows: 2017 2016 DUC Ps. 372,902,629 Ps. 304,299,019 DUC from prior years 2,095,429 — Other 260,775 514,356 Deferred DUC benefit (37,214,624 ) (27,651,571 ) Total DUC and other Ps. 338,044,209 Ps. 277,161,804 The principal factors generating the deferred DUC are the following: 2017 2016 Deferred DUC asset: Provisions Ps. 541,360,940 Ps. 570,544,863 Total deferred DUC asset 541,360,940 570,544,863 Deferred Profit-sharing duty liability: Wells, pipelines, properties, plant and equipment (455,697,786 ) (473,406,721 ) Deferred DUC liability (455,697,786 ) (473,406,721 ) Deferred asset net 85,663,154 97,138,142 Valuation reserve (1) (20,796,959 ) (69,486,571 ) Net, deferred DUC asset Ps. 64,866,195 Ps. 27,651,571 (1)   PEMEX added to its valuation reserve since it estimates that some allowed deductions will not materialize in future years.     The expected expense for DUC is different from that which would result from applying the 65% rate to the tax base, as a result of the items mentioned below: 2017 2016 Expected expense: Ps. 127,436,912 Ps. 159,897,683 Increase (decrease) resulting from: Non-cumulative (514,780,219 ) (423,761,673 ) Non-deductible 387,343,306 263,863,990 Production value 518,433,469 441,655,000 Deductible duties (39,503,110 ) (29,918,201 ) Deferred DUC reserve (48,689,612 ) 69,486,571 Deductions cap (94,552,741 ) (204,575,922 ) DUC from prior years 2,095,429 — Other 260,775 514,356 DUC-Profit-sharing Ps. 338,044,209 Ps. 277,161,804 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. 7,769,915. On November 30, 2017, the Acuerdo por el que se reforman y adicionan diversas disposiciones de las Reglas de carácter general para definir los métodos de ajuste del valor de los hidrocarburos de los derechos sobre hidrocarburos The compensation of Ps. 2,186,963 was also authorized for the recognition of the fair economic value of the investments affected as a result of the allocation process for assignments to carry out hydrocarbon exploration and extraction activities, in accordance with the provisions of Transitory Article 21 of the Federation Income Law of 2017. On April 18, 2016, a decree granting a fiscal benefit to Pemex Exploration and Production (assignee) was published in the Official Gazette of the Federation and increases the limit on the amount Pemex Exploration and Production can deduct for costs, expenses and investments in the calculation of its DUC, for onshore areas or in offshore areas with water depths lower than 500 meters. The benefit was granted to further the Mexican Government’s strategic hydrocarbon exploration and extraction activities through assignments, in light of historically low international hydrocarbons prices in late 2015 and early 2016 combined with historically low oil production in Mexico, thereby, together with other actions avoiding that the worldwide economic conditions had affected the national economy. The benefit obtained was Ps. 40,213,913. Additionally, the Mexican Government granted PEMEX a fiscal support on November 16, 2016 of Ps. 28,439,379. This benefit consisted of a tax credit against the DUC as a measure to mitigate the impact generated by the financial environment of the Mexican hydrocarbons exploration and extraction companies (assignees), as international energy prices continued to be depressed, which impacted the economies of several countries, including Mexico. b. Derecho de Extracción de Hidrocarburos (Hydrocarbons Extraction Duty). 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 2017 Pemex Exploration and Production made payments of Ps. 58,523,125, which are included in the cost of sales line item. c. Derecho de Exploración de Hidrocarburos (Exploration Hydrocarbons Duty). The Mexican Government is entitled to collect a monthly payment of Ps. 1,214.21 per square kilometer of non-producing During 2017, Pemex Exploration and Production made payments under this duty, totaling Ps. 980,843, 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 Ps. 1,583.74 per square kilometer. During the extraction phase, the monthly tax from the start of the extraction phase and until the assignment ends is Ps. 6,334.98 per square kilometer. During 2017 payments for this tax amounted Ps. 3,986,112, 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 Ps. 1,175.42 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. A monthly tax of Ps. 1,583.74 per square kilometer is payable during the exploration phase until the extraction phase begins. During the extraction phase of a project, a monthly tax of Ps. 6,334.98 per square kilometer is payable from the starting date until the relevant contract for exploration and extraction is terminated. Other applicable taxes Beginning with the creation of the Subsidiary Entities during 2015, they became 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). 2017 indirect taxes are as listed below: a. IEPS Tax IEPS Tax on the sale of automotive fuels: IEPS Tax to benefit Mexican states and municipalities: IEPS Tax on Fossil Fuels: 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 VAT is caused by the sales of goods, rendering of services, granting of the temporary use of goods in the national territory and by 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, 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 expenses. For the years ended December 31, 2017, 2016 and 2015, Petroleos Mexicanos and its Subsidiary Companies incurred the following income tax expense (benefit): 2017 2016 2015 Current income tax Ps. 3,546,912 Ps. 6,201,842 Ps. 7,426,892 Deferred income tax (9,334,064 ) (18,842,211 ) (53,014,159 ) Total Ps. (5,787,152 ) Ps. (12,640,369 ) Ps. (45,587,267 ) Income tax REFIPRE (Preferent Fiscal Regime) Ps. 722,984 Ps. — Ps. — The principal factors generating the deferred income tax are the following: 2016 Recognized in profit and loss Recognized in OCI 2017 Deferred income tax asset: Provisions Ps. 5,906,581 Ps. 2,393,237 Ps. — Ps. 8,299,818 Employee benefits provision 125,973,332 4,902,275 (800,284 ) 130,075,323 Advance payments from clients 1,046,010 1,728,296 — 2,774,306 Accrued liabilities 2,269,561 (1,897,574 ) — 371,987 Non-recoverable accounts receivable 778,179 (38,431 ) — 739,748 Derivative financial instruments 223,518 (144,263 ) — 79,255 Wells, pipelines, properties and equipment 458,273,897 (52,834,079 ) — 405,439,818 Tax loss carryforwards (1) 43,327,737 (9,216,777 ) — 34,110,960 Total deferred income tax asset 637,798,815 (55,107,316 ) (800,284 ) 581,891,215 Valuation reserve (2) (565,125,697 ) 64,560,772 — (500,564,925 ) Net deferred income tax asset 72,673,118 9,453,456 (800,284 ) 81,326,290 Deferred income tax liability: Wells, pipelines, properties, plant and equipment (3,632,294 ) 188,676 — (3,443,618 ) Other (502,242 ) (308,068 ) — (810,310 ) Total deferred income tax liability (4,134,536 ) (119,392 ) — (4,253,928 ) Net long-term deferred income tax liability Ps. 68,538,582 Ps. 9,334,064 Ps. (800,284 ) Ps. 77,072,362 2015 Recognized in profit and loss Recognized in OCI and equity (3) 2016 Deferred income tax asset: Provisions Ps. 25,414,822 Ps. (19,508,241 ) Ps. — Ps. 5,906,581 Employee benefits provision 247,834,882 (119,837,137 ) (2,024,413 ) 125,973,332 Advance payments from clients 1,015,357 30,653 — 1,046,010 Accrued liabilities 1,514 2,268,047 — 2,269,561 Non-recoverable accounts receivable 104,346 673,833 — 778,179 Derivative financial instruments 22,506 201,012 — 223,518 Wells, pipelines, properties and equipment 446,970,333 11,303,564 — 458,273,897 Tax loss carryforwards (1) 14,894,231 28,433,506 — 43,327,737 Total deferred income tax asset 736,257,991 (96,434,763 ) (2,024,413 ) 637,798,815 Valuation reserve (2) (681,357,607 ) 116,231,910 — (565,125,697 ) Net deferred income tax asset 54,900,384 19,797,147 (2,024,413 ) 72,673,118 Deferred income tax liability: Wells, pipelines, properties, plant and equipment (1,909,529 ) (726,999 ) (995,766 ) (3,632,294 ) Other (274,305 ) (227,937 ) — (502,242 ) Total deferred income tax liability (2,183,834 ) (954,936 ) (995,766 ) (4,134,536 ) Net long-term deferred income tax liability Ps. 52,716,550 Ps. 18,842,211 Ps. (3,020,179 ) Ps. 68,538,582 (1) Tax loss carryforwards expire in 2027. (2) Due to PEMEX’s estimate that not enough taxable income will be generated in future periods, a valuation reserve was recognized to account for the deferred income tax asset. (3) Includes effects from business combination in equity of Ps. (995,766). 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, 2017 2016 2015 Expected income tax expense Ps. (20,055,588 ) Ps. (14,901,324 ) Ps. (3,089,241 ) Increase (decrease) resulting from: Tax effect of inflation-net 14,302,118 8,098,213 (1,618,327 ) Difference between accounting and tax depreciation (3,713,920 ) (1,765,183 ) (107,231 ) Non-deductible 1,954,659 1,558,120 (1,921,515 ) Others-net (1,725,579 ) (5,630,195 ) (38,850,953 ) Income tax expense Ps. (5,787,152 ) Ps. (12,640,369 ) Ps. (45,587,267 ) As of December 31, 2017 and 2016, the net accumulated effect of actuarial gains and losses on deferred tax was Ps. 17,688,032 and Ps. 16,887,748, respectively. In addition, as of December 31, 2017 and 2016, the deferred tax effect of actuarial gains and losses from Petróleos Mexicanos and PMI CIM are presented in comprehensive (loss) income in the amounts of Ps. (800,284) and Ps. (2,024,413), respectively. As of December 31, 2015, the deferred tax effect of PMI CIM’s performance was Ps. (124,285).

Equity (Deficit), Net

Equity (Deficit), Net	12 Months Ended
	Dec. 31, 2017
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Equity (Deficit), Net	NOTE 21. EQUITY (DEFICIT), NET 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 January 19, 2015, the Mexican Government made an equity contribution of Ps. 10,000,000 to Petróleos Mexicanos in accordance with the Ley Federal del Presupuesto y Responsabilidad Hacendaria On December 24, 2015, the Mexican Government, through the SHCP, issued a non-negotiable On April 21, 2016, the Mexican Government made an equity contribution to Petróleos Mexicanos in the amount of Ps. 26,500,000 following the guidelines established in the Federal Budget and Fiscal Responsibility. This contribution was recognized as an increase in Certificates of Contribution “A.” On August 3, 2016, the Mexican Government issued Ps. 184,230,586 in exchange for the Ps. 50,000,000 non-negotiable PEMEX’s permanent equity is as follows: Amount Certificates of Contribution “A” as of December 31, 2015 Ps. 194,604,835 Increase in Certificates of Contribution “A” during 2016 161,939,612 Certificates of Contribution “A” as of December 31, 2016 356,544,447 Increase in Certificates of Contribution “A” during 2017 — Certificates of Contribution “A” as of December 31, 2017 Ps. 356,544,447 b. Mexican Government contributions As of December 31, 2017 and 2016 there were no Mexican Government contributions. 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. As of December 31, 2017 and 2016, there were no changes to the legal reserve. d. Accumulated deficit from prior years PEMEX has recorded negative earnings in the past several years. However, the Ley de Concursos Mercantiles 2-b). e. Non-controlling Effective July 1, 2005, PEMEX entered into an option agreement with BNP Private Bank & Trust Cayman Limited; the option was not exercised and was terminated on July 20, 2015. On July 1, 2015, PEMEX also entered into a new option agreement with SML Trustees Limited to acquire 100% of the shares of Pemex Finance, Ltd, which allows PEMEX to have control over Pemex Finance Ltd. because of the potential voting rights. As of the date of these consolidated financial statements the option agreement has not been exercised. As a result, the financial results of Pemex Finance, Ltd. are included in these consolidated financial statements of PEMEX. Under IFRS, variations in income and equity from Pemex Finance, Ltd. are presented in the consolidated statements of changes in equity (deficit), net as “non-controlling non-controlling Similarly, because PEMEX does not currently own all of the shares of PMI CIM, HJ BARRERAS 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 As of December 31, 2017 and 2016, non-controlling

Oher Revenues and Expenses - Ne

Oher Revenues and Expenses - Net	12 Months Ended
	Dec. 31, 2017
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Oher Revenues and Expenses - Net	NOTE 22. OTHER REVENUES AND EXPENSES-NET Other revenues and expenses-net 2017 2016 2015 Revenues: Claims recovery Ps. 16,386,250 Ps. 3,695,217 Ps. 1,975,281 Fiscal support (Profit-sharing duty) (see Note 20a.) — 28,439,379 — Other income for services 4,720,546 4,266,854 3,953,888 Price of sale share (see Note 11-iii) 3,139,103 22,684,736 — Other 4,277,207 14,228,801 6,992,954 Revenues from reinsurance premiums 1,986,568 3,694,026 1,497,779 Franchise fees 917,934 1,059,333 1,148,528 Bidding terms, sanctions, penalties and other 825,956 3,223,437 1,262,458 Gain on sale of fixed assets — 2,687,652 — Assets value transferred to CENAGAS — 7,450,931 — Negative IEPS — — 2,519,126 Total other revenues 32,253,564 91,430,366 19,350,014 Expenses: Loss in the Assets value transferred to CENAGAS — (35,333,411 ) — Disposal of assets (8,447,031 ) (2,140,943 ) (3,364,063 ) Transportation and distribution of natural gas (6,652,878 ) (8,830,967 ) (369,317 ) Other (7,927,150 ) (3,581,036 ) (726,589 ) Claims (3,640,036 ) (4,757,116 ) (12,527,548 ) Loss in the sale of associates (412,393 ) (7,473,698 ) — Impairment of goodwill — (4,007,018 ) — Services provided — (2,656,571 ) (3,237,984 ) Total other expenses (27,079,488 ) (68,780,760 ) (20,225,501 ) Other revenues and expenses-net Ps. 5,174,076 Ps. 22,649,606 Ps. (875,487 )

Related Parties

Related Parties	12 Months Ended
	Dec. 31, 2017
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Related Parties	NOTE 23. RELATED PARTIES Directors and employees of Petróleos Mexicanos and the Subsidiary Entities are subject to regulations related 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. Secretary of Energy, Mr. Pedro Joaquín Coldwell, Chairman of the Board of Directors of Petróleos Mexicanos since December 2012, as well as certain members of his family, have held ownership interests since prior to Mr. Pedro Joaquín Coldwell’s appointment to the Board of Directors and through October of 2017 in companies that have entered into agreements with Pemex-Refining, which are now obligations of Pemex Industrial Transformation, for the sale and purchase of gasoline and other products by certain retail service stations and a wholesale distributor, as well as the performance of other related activities, as provided below: Company Name Ownership share Servicio Cozumel, S. A. de C. V. (which operates a retail service station) Mr. Pedro Joaquín Coldwell (1) 60 % Mr. Pedro Oscar Joaquín Delbouis (son of Mr. Joaquín Coldwell) 20 % Mr. Nassim Joaquín Delbouis (son of Mr. Joaquín Coldwell) 20 % Planta de Combustible Cozumel, S. A. de C. V. (which operates as a wholesale distributor) Fideicomiso Testamentario (2) 57 % Mr. Pedro Joaquín Coldwell (1) 40 % Gasolinera y Servicios Juárez, S. A. de C. V. (which operates a retail service station) Mr. Pedro Joaquín Coldwell (1) 40 % Fideicomiso Testamentario (3) 40 % Mr. Ignacio Nassim Ruiz Joaquín (nephew of Mr. Joaquín Coldwell) 20 % Combustibles Caleta, S. A. de C. V. (which operates a retail service station) Mr. Pedro Joaquín Coldwell (1) 20 % Mr. Pedro Oscar Joaquín Delbouis 20 % Mr. Nassim Joaquín Delbouis 20 % Fideicomiso Testamentario (4) 20 % Mr. Ignacio Nassim Ruiz Joaquín 20 % Combustibles San Miguel, S. A. de C. V. (which operates a retail service station) Mr. Pedro Joaquín Coldwell (1) 25 % Mr. Pedro Oscar Joaquín Delbouis 25 % Mr. Nassim Joaquín Delbouis 25 % Mr. Ignacio Nassim Ruiz Joaquín 25 % (1) In November, 2017, Mr. Pedro Joaquín Coldwell transmitted all of his shares in these companies to a management and investment trust held at Banco Mercantil del Norte, S.A., Institución de Banca Múltiple, Grupo Financiero Banorte. (2) 60% of these shares were owned by Fausto Nassim Joaquín Ibarra (father of Pedro Joaquín Coldwell), until his death in June of 2016, after which 57% of these shares became property of an investment, management and testamentary revocable trust, which is referred to as the Testamentary Trust. 50% of the voting rights of these shares are currently exercised by Mr. Pedro Oscar Joaquín Delbouis, and 50% are exercised by Mr. Nassim Joaquín Delbouis. (3) 40% of these shares were owned by Fausto Nassim Joaquín Ibarra until his death in June of 2016, after which these shares became property of the Testamentary Trust. 100% of the voting rights of these shares are currently exercised by Mr. Pedro Joaquín Coldwell. (4) 20% of these shares were owned by Fausto Nassim Joaquín Ibarra until his death in June of 2016, after which these shares became property of the Testamentary Trust. 50% of the voting rights of these shares are currently exercised by Mr. Pedro Oscar Joaquín Delbouis, and 50% are exercised by Mr. Nassim Joaquín Delbouis. The rights of these companies to operate retail service stations and distribute gasoline and other products on a wholesale basis in Mexico are dependent on these agreements, the expiration or non-renewal a. Compensation of Directors and Officers For the years ended December 31, 2017, 2016 and 2015, the aggregate compensation of executive officers of Petróleos Mexicanos and the Subsidiary Entities paid or accrued in that year for services in all capacities was approximately Ps. 50,749, Ps. 49,165 and Ps. 116,930, respectively. Retirement and former employee benefits are granted as described in Note 17. Except in the case of the professional members, with respect to the previous Board of Directors of Petróleos Mexicanos and the boards of directors of the existing Subsidiary Entities, and the independent members, with respect to the new Board of Directors of Petróleos Mexicanos, 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 2017, 2016 and 2015 to the professional members of the previous Board of Directors of Petróleos Mexicanos and boards of directors of the existing Subsidiary Entities was approximately Ps. 7,525, Ps. 8,339, and Ps. 17,899, respectively. b. Salary Advances 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, 2017
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Commitments	NOTE 24. 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: 2018 Ps. 773,047 2019 783,197 2020 785,670 2021 786,323 2022 782,584 2023 and thereafter 3,595,798 Total Ps. 7,506,619 c. As of December 31, 2017, 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, 2017 and 2016, the estimated value of these contracts was as follows: Maturity 2017 2016 Up to 1 year Ps. 5,533,174 Ps. 7,366,247 1 to 3 years 1,891,557 2,518,207 4 to 5 years 1,856,006 2,470,878 More than 5 years 3,123,173 4,157,843 Total Ps. 12,403,910 Ps. 16,513,175 d. As of December 31, 2017 and 2016, Pemex Exploration and Production, has in operation certain integrated exploration and production contracts (“Integrated E&P Contracts”) for the development of mature fields in the Altamira, Ébano, Nejo, Pánuco and San Andrés blocks in the Northern region of Mexico and Magallanes, Santuario and Carrizo blocks in the Southern region of Mexico, respectively. Each contract has a term of up to 25 years. Payments to the contractors pursuant to the Integrated E&P Contracts will be made on a per-barrel e. As of December 31, 2017 and 2016, 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 2017 2016 Up to 1 year Ps. 229,738,368 Ps. 347,606,848 1 to 3 years 196,335,411 281,563,607 4 to 5 years 123,159,215 69,541,826 More than 5 years 149,672,236 119,281,849 Total Ps. 698,905,230 Ps. 817,994,130

Contingencies

Contingencies	12 Months Ended
	Dec. 31, 2017
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Contingencies	NOTE 25. 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, 2017 and 2016, PEMEX had accrued a reserve of Ps. 7,812,689 and Ps. 15,119,692, respectively, for these contingent liabilities. As of December 31, 2017, 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 (“Seventh Regional Metropolitan Court”) of the Tribunal Federal de Justicia Fiscal y Administrativa (“Tax and Administrative Federal Court”) in connection with an administrative claim (No. 4957/1117071) filed by EMS Energy Services de México, S. de R.L. de C.V. and Energy Maintenance Services Group I. LLC requesting that Pemex-Exploration and Production’s termination of the public works contract be declared null and void. In a concurrent proceeding, the plaintiffs also filed an administrative claim (No. 13620/15-17-06) • In June 2016, Pemex Exploration and Production was summoned before the Juzgado Octavo de Distrito en Materia Civil (“Eighth Civil District Court”) in Mexico City, in connection with a claim filed by Drake Mesa, S. de R.L. (file No. 200/2016-II), • On June 11, 2015, the Segunda Sala Regional del Noreste (“Second Regional Northeast Court”) notified Pemex-Refining of an administrative claim (file no. 2383/15-06-02-4) • On July 8, 2011, Pemex Exploration and Production was summoned in connection with an administrative claim (no. 4334/1111026) filed by Compañía Petrolera La Norma, S.A., against the Chief Executive Officer of Petróleos Mexicanos and the Chief Executive Officer of Pemex-Exploration and Production before the Segunda Sala Regional Hidalgo-México (4334/11-11-02-6/1337/14-s2-07-04). • 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 a pipelines construction contract. A response by the defendant is still pending as of the date of these financial statements. • On August 1, 2017, Pemex Exploration and Production was summoned in connection with an administrative claim (no. 11590/17-17-06-2) 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 Pemex Exploration and Production, as required by the NHC: • 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 US $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. $1,750,000. • 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. Certain other Subsidiary Entities have also granted guarantees and other contingencies. PEMEX considers the probability it needs to make a disbursement of cash, for the guarantees granted and in effect as of December 31, 2017 remote.

Business Combination

Business Combination	12 Months Ended
	Dec. 31, 2017
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Business Combination	NOTE 26. BUSINESS COMBINATION On January 28, 2016, PMX Fertilizantes Pacífico, S.A. de C.V., a PEMEX subsidiary company, acquired 99.99% of the outstanding shares of Fertinal, for a total purchase price of Ps. 4,322,826. This amount was paid through credit lines under a simple credit agreement. Additionally, within the same credit line, PMX Fertilizantes obtained U.S. $425,800 for the liquidation of Fertinal’s debt. These loans will mature in 16 years. The net fair value of Fertinal’s assets and liabilities as of the date of acquisition is: Fair value Cash and cash equivalents Ps. (6,943 ) Accounts receivable 102,121 Inventories 762,254 Properties, plant and equipment 9,811,928 Other assets 1,671,718 Total assets 12,341,078 Accounts payable Ps. 2,331,540 Debt 9,365,152 Deferred taxes 328,578 Total liabilities 12,025,270 Total assets, net Ps. 315,808 Transaction value Ps. 4,322,826 Goodwill Ps. 4,007,018 PMX FP carried out the purchase price allocation (PPA) of the Fertinal acquisition in accordance with International Financial Reporting Standard 3 “Business Combination”. It was determined that net assets acquired amounted to Ps. 315,808 and a goodwill of Ps. 4,007,018. As of December 31, 2016, a calculation of the impairment of goodwill resulted in the complete cancellation of that amount. The impairment of goodwill is recognized in the consolidated statement of comprehensive income in other income (expenses), net. See Note 22. PEMEX intends to incorporate Fertinal into the gas-ammonia

Subsequent Events

Subsequent Events	12 Months Ended
	Dec. 31, 2017
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Subsequent Events	NOTE 27. SUBSEQUENT EVENTS During the period from January 1 to April 27, 2018, PEMEX participated in the following financing activities: • On February, 12, 2018, Petróleos Mexicanos issued U.S. $4,000,000 of debt securities under its U.S. $92,000,000 Medium-Term Notes Program, Series C, in two tranches: (1) U.S. $2,500,000,000 5.35% Notes due 2028 and (2) U.S. $1,500,000,000 6.35% Bonds due 2048. All debt securities under this program are guaranteed by Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services. • On February 12, 2018, Petróleos Mexicanos consummated an exchange offer pursuant to which it exchanged (1) U.S. $952,454, aggregate principal amount of its outstanding 5.500% Bonds due 2044 for U.S. $881,899, aggregate principal amount of its new 6.350% Bonds due 2048 and (2) U.S. $1,021,065, aggregate principal amount of its outstanding 5.6250% Bonds due 2046 for U.S. $946,764, aggregate principal amount of its 6.350% Bonds due 2048. • On March 5, 2018, Petróleos Mexicanos consummated a tender offer pursuant to which it purchased U.S. $138,598, aggregate principal amount of its outstanding 3.125% Notes due 2019, U.S. $558,644 aggregate principal amount of its outstanding 5.500% Notes due 2019, U.S. $91,843 aggregate principal amount of its outstanding 8.000% Notes due 2019, U.S. $183,017 aggregate principal amount of its outstanding 6.000% Notes due 2020 and U.S. $817,303 aggregate principal amount of its outstanding 3.500% Notes due 2020. Between January 1 to April 27, 2018, PMI HBV obtained U.S. $7,126,000 and repaid U.S. $6,126,000 in financing from its revolving credit lines. As of April 27, 2018, the outstanding amount under these revolving credit lines was U.S. $1,227,500. As of April 27, 2018, the Mexican peso-U.S. As of April 27, 2018, the weighted average price of the crude oil exported by PEMEX was U.S. $60.89 per barrel. This represents a price increase of approximately 8.3% as compared to the average price as of December 31, 2017, which was U.S. $56.19 per barrel. In March 2018, Pemex Exploration and Production was summoned before the International Centre for Dispute Resolution of the American Arbitration Association in connection with an arbitration claim (No. 01-18-0001-1499)

Subsidiary Guarantor Informatio

Subsidiary Guarantor Information	12 Months Ended
	Dec. 31, 2017
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Subsidiary Guarantor Information	NOTE 28. SUBSIDIARY GUARANTOR INFORMATION The following consolidating information presents: (i) condensed consolidated statements of financial position at December 31, 2017 and 2016 and condensed consolidated statements of comprehensive income and cash flows for the years ended December 31, 2017, 2016 and 2015 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 balances and transactions. Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services (collectively, the “Subsidiary Guarantors”) and Pemex Ethylene and Pemex Fertilizers are 100%-owned subsidiaries of the Mexican Government. The guaranties by the Subsidiary Guarantors of Petróleos Mexicanos’ payment obligations under this indebtedness are full, unconditional, joint and several. Pemex Ethylene, Pemex Fertilizers, Pemex Finance, Ltd. and the Subsidiary Companies collectively comprise the 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, 2017, 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 obligor Guarantors Principal outstanding 5.75% Guaranteed Notes due 2018 Petróleos Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services 834,688 6.625% Guaranteed Bonds due 2035 Petróleos Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services 1,750,000 6.625% Guaranteed Bonds due 2038 Petróleos Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services 491,175 8.625% Bonds due 2022 Petróleos Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services 160,245 8.625% Guaranteed Bonds due 2023 Petróleos Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services 106,507 9 1 4 Petróleos Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services 107,109 9.50% Guaranteed Bonds due 2027 Petróleos Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services 219,217 The following table sets forth, as of December 31, 2017, the principal amount outstanding of the registered debt securities issued by Petróleos Mexicanos, and guaranteed by Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services. Table 2: Registered Debt Securities originally issued by Petróleos Mexicanos Security Issuer Guarantors Principal amount outstanding (U.S. $) 8.00% Notes due 2019 Petróleos Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services 1,312,015 9 1 4 Petróleos Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services 9,296 9.50% Global Guaranteed Bonds due 2027 Petróleos Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services 102,149 3.500% Notes due 2018 Petróleos Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services 355,356 Floating Rate Notes due 2018 Petróleos Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services 498,570 6.000% Notes due 2020 Petróleos Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services 995,364 5.50% Notes due 2021 Petróleos Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services 2,962,047 3.500% Notes due 2023 Petróleos Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services 2,099,730 4.875% Notes due 2024 Petróleos Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services 1,499,136 6.625% Notes due 2035 Petróleos Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services 999,000 6.500% Bonds due 2041 Petróleos Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services 3,000,000 4.875% Bonds 2022 Petróleos Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services 2,097,055 3.125% Notes due 2019 Petróleos Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services 325,778 3.500% Notes due 2020 Petróleos Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services 1,465,367 5.50% Bonds due 2044 Petróleos Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services 2,657,962 6.375% Bonds due en 2045 Petróleos Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services 2,999,980 5.625% Bonds due 2046 Petróleos Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services 2,996,226 4.500% Notes due 2026 Petróleos Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services 1,489,718 4.250% Notes due 2025 Petróleos Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services 998,435 5.500% Notes due 2019 Petróleos Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services 740,851 6.375% Notes due 2021 Petróleos Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services 1,247,668 6.875% Notes due 2026 Petróleos Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services 2,970,334 4.625% Notes due 2023 Petróleos Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services 2,055,498 6.750% Notes due 2047 Petróleos Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services 3,671,628 Petróleos Mexicanos is the only PEMEX entity that had debt securities registered with the SEC outstanding as of December 31, 2017 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, 2017 Petróleos Mexicanos Subsidiary guarantors Non-guarantor subsidiaries Eliminations PEMEX consolidated Assets Current assets Cash and cash equivalents Ps. 46,959,103 Ps. 18,815,345 Ps. 32,077,306 Ps. — Ps. 97,851,754 Accounts receivable and other, net, and derivative financial instruments 83,119,394 38,105,354 79,533,940 — 200,758,688 Accounts receivable—inter-company 311,148,593 1,380,100,592 86,354,837 (1,777,604,022 ) — Inventories 509,375 32,357,125 30,992,430 — 63,858,930 Available-for-sale — — 1,056,918 — 1,056,918 Total current assets 441,736,465 1,469,378,416 230,015,431 (1,777,604,022 ) 363,526,290 Long-term receivables—intercompany 1,823,276,758 285 3,597,880 (1,826,874,923 ) — Investments in joint ventures and associates (465,832,399 ) 82,668 16,611,681 465,845,414 16,707,364 Wells, pipelines, properties, plant and equipment-net 12,444,376 1,370,974,060 53,090,890 — 1,436,509,326 Long-term notes receivables 147,286,367 1,206,542 — — 148,492,909 Deferred taxes 59,691,528 84,443,897 2,057,060 — 146,192,485 Intangible assets — 9,088,563 — — 9,088,563 Other assets 2,209,579 4,846,078 4,429,520 — 11,485,177 Total assets Ps. 2,020,812,674 Ps. 2,940,020,509 Ps. 309,802,462 Ps. (3,138,633,531 ) Ps. 2,132,002,114 Liabilities Current liabilities Current portion of long-term debt Ps. 137,947,110 Ps. 5,386,564 Ps. 13,875,793 Ps. — Ps. 157,209,467 Accounts payable—inter-company 1,240,490,891 434,556,688 93,140,905 (1,768,188,484 ) — Other current liabilities 23,435,614 157,589,107 50,892,997 — 231,917,718 Total current liabilities 1,401,873,615 597,532,359 157,909,695 (1,768,188,484 ) 389,127,185 Long-term debt 1,824,829,579 40,262,391 15,573,634 — 1,880,665,604 Long-term payables—inter-company — 1,830,150,615 6,139,845 (1,836,290,460 ) — Employee benefits, provisions for sundry creditors, other liabilities and deferred taxes 297,028,436 1,057,191,286 10,341,988 — 1,364,561,710 Total liabilities 3,523,731,630 3,525,136,651 189,965,162 (3,604,478,944 ) 3,634,354,499 Equity (deficit), net (1,502,918,956 ) (585,116,142 ) 119,837,300 465,845,413 (1,502,352,385 ) Total liabilities and equity Ps. 2,020,812,674 Ps. 2,940,020,509 Ps. 309,802,462 Ps. (3,138,633,531 ) Ps. 2,132,002,114 SUPPLEMENTAL CONDENSED CONSOLIDATING FINANCIAL INFORMATION STATEMENT OF FINANCIAL POSITION As of December 31, 2016 Petróleos Mexicanos Subsidiary guarantors Non-guarantor subsidiaries Eliminations PEMEX consolidated Assets Current assets Cash and cash equivalents Ps. 92,503,607 Ps. 9,732,503 Ps. 61,296,403 Ps. — Ps. 163,532,513 Accounts receivable and other, net, and derivative financial instruments 6,604,595 75,760,079 55,713,323 — 138,077,997 Accounts receivable—inter-company 440,645,367 1,684,782,235 70,268,246 (2,195,695,848 ) — Inventories 446,954 29,270,943 16,174,163 — 45,892,060 Available-for-sale — — 2,852,679 — 2,852,679 Held-for-sale non-financial — 7,460,674 — — 7,460,674 Total current assets 540,200,523 1,807,006,434 206,304,814 (2,195,695,848 ) 357,815,923 Available-for-sale — — 6,027,540 — 6,027,540 Long-term receivables—intercompany 1,740,519,399 289 6,384,944 (1,746,904,632 ) — Investments in joint ventures and associates (250,108,630 ) 396,681 20,327,813 250,121,645 20,737,509 Wells, pipelines, properties, plant and equipment-net 12,596,722 1,595,655,580 59,489,946 — 1,667,742,248 Long-term notes receivables 140,579,974 8,027,628 — — 148,607,602 Deferred taxes 59,162,878 40,341,615 820,196 — 100,324,689 Restricted cash — 9,624,804 853,822 — 10,478,626 Intangible assets — 8,639,242 — — 8,639,242 Other assets 1,824,104 2,707,788 4,980,753 — 9,512,645 Total assets Ps. 2,244,774,970 Ps. 3,472,400,061 Ps. 305,189,828 Ps. (3,692,478,835 ) Ps. 2,329,886,024 Liabilities Current liabilities Current portion of long-term debt 157,937,631 7,381,095 10,847,462 — 176,166,188 Accounts payable—inter-company 1,265,244,986 854,106,939 68,510,835 (2,187,862,760 ) — Other current liabilities 34,913,773 169,182,239 45,927,686 — 250,023,698 Total current liabilities 1,458,096,390 1,030,670,273 125,285,983 (2,187,862,760 ) 426,189,886 Long-term debt 1,737,332,174 46,090,919 23,581,449 — 1,807,004,542 Long-term payables—inter-company — 1,746,433,870 8,303,850 (1,754,737,720 ) — Employee benefits, provisions for sundry creditors, other liabilities and deferred taxes 282,902,667 1,035,019,339 11,777,737 — 1,329,699,743 Total liabilities 3,478,331,231 3,858,214,401 168,949,019 (3,942,600,480 ) 3,562,894,171 Equity (deficit), net (1,233,556,261 ) (385,814,340 ) 136,240,809 250,121,645 (1,233,008,147 ) Total liabilities and equity Ps. 2,244,774,970 Ps. 3,472,400,061 Ps. 305,189,828 Ps. (3,692,478,835 ) Ps. 2,329,886,024 SUPPLEMENTAL CONDENSED CONSOLIDATING FINANCIAL INFORMATION STATEMENT OF COMPREHENSIVE INCOME For the year ended December 31, 2017 Petróleos Mexicanos Subsidiary Non-guarantor Eliminations PEMEX consolidated Net sales Ps. — Ps. 1,713,914,703 Ps. 1,096,752,930 Ps. (1,424,768,483 ) Ps. 1,385,899,150 Services income 50,399,983 140,934,022 2,646,144 (182,849,580 ) 11,130,569 Total sales revenues 50,399,983 1,854,848,725 1,099,399,074 (1,607,618,063 ) 1,397,029,719 Impairment of wells, pipelines, properties, plant and equipment — 145,302,407 6,142,153 — 151,444,560 Cost of sales 2,007,814 1,447,640,131 1,083,297,610 (1,528,740,675 ) 1,004,204,880 Gross income 48,392,169 261,906,187 9,959,311 (78,877,388 ) 241,380,279 Other revenues (expenses), net (341,521 ) (12,443,660 ) (4,664,096 ) 22,623,353 5,174,076 General expenses: Transportation, distribution and sale expenses — 26,136,674 1,297,558 (5,544,562 ) 21,889,670 Administrative expenses 59,141,391 105,920,390 5,883,200 (51,005,527 ) 119,939,454 Total general expenses 59,141,391 132,057,064 7,180,758 (56,550,089 ) 141,829,124 Operating income (11,090,743 ) 117,405,463 (1,885,543 ) 296,054 104,725,231 Financing income 143,676,367 134,401,598 3,185,195 (265,097,307 ) 16,165,853 Financing cost (236,929,035 ) (141,900,236 ) (3,616,530 ) 264,801,253 (117,644,548 ) Derivative financial instruments income (cost), net 27,670,991 (1,608,039 ) (724,628 ) — 25,338,324 Foreign exchange income , net 6,837,171 15,807,988 538,963 — 23,184,122 Profit (loss) sharing in joint ventures and associates (211,567,169 ) 409,955 (49,515 ) 211,567,169 360,440 Income (loss) before taxes, duties and other (281,402,418 ) 124,516,729 (2,552,058 ) 211,567,169 52,129,422 Total taxes, duties and other (557,520 ) 331,001,261 2,536,300 — 332,980,041 Net (loss) income for the year (280,844,898 ) (206,484,532 ) (5,088,358 ) 211,567,169 (280,850,619 ) Total other comprehensive result 4,728,640 6,841,586 (63,845 ) — 11,506,381 Total comprehensive result for the year Ps. (276,116,258 ) Ps. (199,642,946 ) Ps. (5,152,203 ) Ps. 211,567,169 Ps. (269,344,238 ) SUPPLEMENTAL CONDENSED CONSOLIDATING FINANCIAL INFORMATION STATEMENT OF COMPREHENSIVE INCOME For the year ended December 31, 2016 Petróleos Mexicanos Subsidiary Non-guarantor Eliminations PEMEX consolidated Net sales Ps. — Ps. 1,361,538,624 Ps. 828,143,332 Ps. (1,124,563,366 ) Ps. 1,065,118,590 Services income 46,330,245 98,959,131 1,970,055 (138,284,789 ) 8,974,642 Total sales revenues 46,330,245 1,460,497,755 830,113,387 (1,262,848,155 ) 1,074,093,232 (Reversal) impairment of wells, pipelines, properties, plant and equipment — (330,037,834 ) (1,276,509 ) — (331,314,343 ) Cost of sales 1,236,921 1,244,388,072 809,156,778 (1,188,959,550 ) 865,822,221 Gross income 45,093,324 546,147,517 22,233,118 (73,888,605 ) 539,585,354 Other revenues (expenses), net (312,611 ) 20,713,184 2,915,837 (666,804 ) 22,649,606 General expenses: Transportation, distribution and sale expenses — 50,948,771 945,489 (26,663,020 ) 25,231,240 Administrative expenses 57,437,455 96,884,031 7,050,271 (48,718,224 ) 112,653,533 Total general expenses 57,437,455 147,832,802 7,995,760 (75,381,244 ) 137,884,773 Operating income (12,656,742 ) 419,027,899 17,153,195 825,835 424,350,187 Financing income 123,266,281 67,542,768 3,526,378 (180,586,172 ) 13,749,255 Financing cost (160,824,632 ) (114,271,762 ) (3,602,868 ) 179,854,798 (98,844,464 ) Derivative financial instruments (cost) income, net (12,052,200 ) 3,172 (1,951,959 ) — (14,000,987 ) Foreign exchange loss, net (20,531,005 ) (232,714,446 ) (767,292 ) — (254,012,743 ) Profit (loss) sharing in joint ventures and associates (117,347,803 ) 628,357 1,507,488 117,347,803 2,135,845 Income (loss) before taxes, duties and other (200,146,101 ) 140,215,988 15,864,942 117,442,264 73,377,093 Total taxes, duties and other (8,834,626 ) 266,155,181 7,200,880 — 264,521,435 Net (loss) income for the year (191,311,475 ) (125,939,193 ) 8,664,062 117,442,264 (191,144,342 ) Total other comprehensive result 10,126,560 96,032,433 21,713,488 — 127,872,481 Total comprehensive result for the year Ps. (181,184,915 ) Ps. (29,906,760 ) Ps. 30,377,550 Ps. 117,442,264 Ps. (63,271,861 ) SUPPLEMENTAL CONDENSED CONSOLIDATING FINANCIAL INFORMATION STATEMENT OF COMPREHENSIVE INCOME For the year ended December 31, 2015 Petróleos Subsidiary guarantors Non-guarantor Eliminations PEMEX Net sales Ps. 15,556 Ps. 1,523,767,800 Ps. 803,623,324 Ps. (1,173,956,323 ) Ps. 1,153,450,357 Services income 16,897,139 16,815,589 2,585,617 (27,988,310 ) 8,310,035 Total sales revenues 16,912,695 1,540,583,389 806,208,941 (1,201,944,633 ) 1,161,760,392 Impairment of wells, pipelines, properties, plant and equipment — 476,276,159 1,668,531 — 477,944,690 Benefit from change in pension plan (83,657,496 ) (8,519,593 ) — (92,177,089 ) Cost of sales 2,695,423 1,280,404,059 791,147,745 (1,182,282,621 ) 891,964,606 Gross income 14,217,272 (132,439,333 ) 21,912,258 (19,662,012 ) (115,971,815 ) Other (expenses) revenues, net (19,805 ) (6,073,003 ) 3,326,421 1,890,900 (875,487 ) General expenses: Transportation, distribution and sale expenses — 32,870,908 2,921,430 (6,863,699 ) 28,928,639 Administrative expenses 59,923,878 52,832,029 10,638,127 (10,921,939 ) 112,472,095 Benefit from change in pension plan (46,031,780 ) (50,394,477 ) (7,434,698 ) — (103,860,955 ) Total general expenses 13,892,098 35,308,460 6,124,859 (17,785,638 ) 37,539,779 Operating income 305,369 (173,820,796 ) 19,113,820 14,526 (154,387,081 ) Financing income 108,543,665 28,639,034 3,478,434 (125,670,274 ) 14,990,859 Financing cost (85,544,060 ) (104,453,148 ) (3,306,776 ) 125,530,391 (67,773,593 ) Derivative financial instruments (cost) income, net (22,803,663 ) 6,463 1,347,323 — (21,449,877 ) Foreign exchange loss, net (14,829,436 ) (139,623,910 ) (312,228 ) — (154,765,574 ) (Loss) profit sharing in joint ventures and associates (749,963,960 ) 198,786 2,119,329 749,963,960 2,318,115 (Loss) income before taxes, duties and other (764,292,085 ) (389,053,571 ) 22,439,902 749,838,603 (381,067,151 ) Total taxes, duties and other (51,982,560 ) 376,649,369 6,833,438 — 331,500,247 Net (loss) income for the year (712,309,525 ) (765,702,940 ) 15,606,464 749,838,603 (712,567,398 ) Total other comprehensive result 10,980,787 56,585,790 21,045,777 — 88,612,354 Total comprehensive result for the year Ps. (701,328,738 ) Ps. (709,117,150 ) Ps. 36,652,241 Ps. 749,838,603 Ps. (623,955,044) SUPPLEMENTAL CONDENSED CONSOLIDATING FINANCIAL INFORMATION STATEMENT OF CASH FLOWS For the year ended December 31, 2017 Petróleos Subsidiary Non-guarantor Eliminations PEMEX Operating activities: Net (loss) income for the year Ps. (280,844,898 ) Ps. (206,484,532 ) Ps. (5,082,639 ) Ps. 211,561,450 Ps. (280,850,619 ) Adjustments to reconcile net loss to cash provided by operating activities: Depreciation and amortization 1,155,881 152,607,943 2,940,689 — 156,704,513 Impairment of wells, pipelines, properties, plant and equipment — 145,302,407 6,142,153 — 151,444,560 Unsuccessful wells — 6,164,624 — — 6,164,624 Exploration costs — (1,447,761 ) — — (1,447,761 ) Disposal of wells, pipelines, properties, plant and equipment 433,391 14,687,229 1,943,051 — 17,063,671 Gain on sale of share in joint ventures and associates — (3,139,103 ) — — (3,139,103 ) Disposal of held—for—sale current non—financial assets — 2,808,360 — — 2,808,360 Dividends — — (180,675 ) — (180,675 ) Effects of net present value of reserve for well abandonment — 7,774,000 — — 7,774,000 Profit (loss) sharing in investments 211,567,169 (409,955 ) 49,515 (211,567,169 ) (360,440 ) Decrease on available—for-sale — — 1,360,205 — 1,360,205 Net loss on available-for-sale financial assets — — 3,523,748 — 3,523,748 Unrealized foreign exchange loss (gain) (13,526,153 ) (1,585,910 ) (1,573,376 ) — (16,685,439 ) Interest expense 100,545,114 15,736,420 1,363,014 — 117,644,548 Funds (used in) from operating activities: Accounts receivable, accounts payable and derivative financial instruments (88,496,967 ) (14,214,566 ) (20,789,692 ) — (123,501,225 ) Inventories (62,421 ) (3,086,181 ) (14,818,268 ) — (17,966,870 ) Other assets (7,091,867 ) (483,389 ) 551,233 — (7,024,023 ) Employee benefits 18,829,768 31,489,785 (254,157 ) — 50,065,396 Inter-company charges and deductions 7,284,124 (114,968,213 ) 514,270 107,169,819 — Cash flows (used in) from operating activities (50,206,859 ) 30,751,158 (24,310,929 ) 107,164,100 63,397,470 Investing activities: Acquisition of wells, pipelines, properties, plant and equipment (1,436,926 ) (87,274,561 ) (3,147,978 ) — (91,859,465 ) Resources from sale available-for-sale — — 8,026,836 — 8,026,836 Resources from sale of shares in associates — 3,863,072 (721,362 ) — 3,141,710 (Increase) decrease due to Inter-company investing 25,611,359 — — (25,611,359 ) — Cash flows used in investing activities 24,174,433 (83,411,489 ) 4,157,496 (25,611,359 ) (80,690,919 ) Financing activities: Loans obtained from financial institutions 401,947,349 — 302,768,119 — 704,715,468 Debt payments, principal only (327,703,729 ) (7,981,937 ) (306,374,153 ) — (642,059,819 ) Interest paid (93,755,698 ) (13,991,633 ) (1,163,086 ) — (108,910,417 ) Inter-company increase (decrease) financing — 83,716,743 (2,164,002 ) (81,552,741 ) — Cash flows provided by financing activities: (19,512,078 ) 61,743,173 (6,933,122 ) (81,552,741 ) (46,254,768 ) Net (decrease) increase in cash and cash equivalents (45,544,504 ) 9,082,842 (27,086,555 ) — (63,548,217 ) Effects of change in cash value — — (2,132,542 ) — (2,132,542 ) Cash and cash equivalents at the beginning of the year 92,503,607 9,732,503 61,296,403 — 163,532,513 Cash and cash equivalents at the end of the year Ps. 46,959,103 Ps. 18,815,345 Ps. 32,077,306 Ps. — Ps. 97,851,754 SUPPLEMENTAL CONDENSED CONSOLIDATING FINANCIAL INFORMATION STATEMENT OF CASH FLOWS For the year ended December 31, 2016 Petróleos Subsidiary Non-guarantor Eliminations PEMEX Operating activities: Net (loss) income for the year Ps. (191,311,476 ) Ps. (139,410,398 ) Ps. 22,160,755 Ps. 117,416,777 Ps. (191,144,342 ) Adjustments to reconcile net loss to cash provided by operating activities: Depreciation and amortization 1,066,033 146,545,307 2,828,151 — 150,439,491 (Reversal) impairment of wells, pipelines, properties, plant and equipment — (330,037,834 ) (1,276,509 ) — (331,314,343 ) Unsuccessful wells — 29,106,084 — — 29,106,084 Exploration costs — (2,022,826 ) — — (2,022,826 ) Disposal of wells, pipelines, properties, plant and equipment 320,599 2,658,625 792,063 — 3,771,287 Loss in sale of fixed assets — 27,882,480 — — 27,882,480 Gain on sale of share in joint ventures and associates — (15,211,039 ) — — (15,211,039 ) Profit (loss) sharing in joint ventures and associates 117,249,643 (628,356 ) (1,507,489 ) (117,249,643 ) (2,135,845 ) Impairment of goodwill — — 4,007,018 — 4,007,018 Dividends — — (293,397 ) — (293,397 ) Effects of net present value of reserve for well abandonment — 11,968,966 — — 11,968,966 Unrealized foreign exchange loss (gain) 231,191,646 6,754,046 5,237,072 — 243,182,764 Interest expense 91,044,541 5,687,502 2,112,421 — 98,844,464 Funds (used in) from operating activities: Accounts receivable, accounts payable and derivative financial instruments 23,636,331 (158,449,370 ) 45,028,534 — (89,784,505 ) Inventories 83,317 3,508,494 (4,950,690 ) — (1,358,879 ) Other assets (2,405,412 ) (22,600,504 ) (122,614 ) — (25,128,530 ) Employee benefits 2,591,000 136,354,337 (91,652,268 ) — 47,293,069 Inter-company charges and deductions (393,835,932 ) (83,049,125 ) 48,435,633 428,449,424 — Cash flows (used in) from operating activities (120,369,710 ) (380,943,611 ) 30,798,680 428,616,558 (41,898,083 ) Investing activities: Acquisition of wells, pipelines, properties, plant and equipment (2,172,586 ) (147,786,686 ) (1,449,208 ) — (151,408,480 ) Resources from sale on share in associates — 23,050,344 (365,608 ) — 22,684,736 Proceeds from the sale of fixed assets — 560,665 — — 560,665 Business acquisition — — (4,329,769 ) — (4,329,769 ) (Increase) decrease due to Inter-company investing (39,612,699 ) — — 39,612,699 — Cash flows used in investing activities (41,785,285 ) (124,175,677 ) (6,144,585 ) 39,612,699 (132,492,848 ) Financing activities: Increase in equity due to Certificates of Contributions “A” 73,500,000 — — — 73,500,000 Loans obtained from financial institutions 571,944,209 34,483,348 235,564,210 — 841,991,767 Debt payments, principal only (372,809,166 ) (6,414,441 ) (235,763,722 ) — (614,987,329 ) Interest paid (82,008,347 ) (4,706,946 ) (2,038,848 ) — (88,754,141 ) Inter-company increase (decrease) financing — 464,488,030 3,741227 (468,229,257 ) — Cash flows provided by financing activities: 190,626,696 487,849,991 1,502,867 (468,229,257 ) 211,750,297 Net (decrease) increase in cash and cash equivalents 28,471,701 (17,269,297 ) 26,156,962 — 37,359,366 Effects of change in cash value 5,570,892 20,371,126 (9,137,751 ) — 16,804,267 Cash and cash equivalents at the beginning of the year 58,461,014 6,630,674 44,277,192 — 109,368,880 Cash and cash equivalents at the end of the year Ps. 92,503,607 Ps. 9,732,503 Ps. 61,296,403 Ps. — Ps. 163,532,513 SUPPLEMENTAL CONDENSED CONSOLIDATING FINANCIAL INFORMATION STATEMENT OF CASH FLOWS For the year ended December 31, 2015 Petróleos Subsidiary Non-guarantor Eliminations PEMEX Operating activities: Net (loss) income for the year Ps. (712,177,124 ) Ps. (765,702,826 ) Ps. 15,738,868 Ps. 749,573,684 Ps. (712,567,398 ) Adjustments to reconcile net loss to cash provided by operating activities: Depreciation and amortization 789,657 164,221,429 2,940,164 — 167,951,250 Impairment of wells, pipelines, properties, plant and equipment — 476,276,159 1,668,531 — 477,944,690 Unsuccessful wells — 23,213,519 — — 23,213,519 Exploration costs — (5,698,511 ) — — (5,698,511 ) Disposal of wells, pipelines, properties, plant and equipment 180,992 21,945,266 2,512,279 — 24,638,537 Profit (loss) sharing in joint ventures and associates 749,963,958 (198,786 ) (2,119,329 ) (749,963,958 ) (2,318,115 ) Gain on sale of share in joint ventures and associates — (337,675 ) (342,955 ) — (680,630 ) Dividends — — (359,941 ) — (359,941 ) Effects of net present value of reserve for well abandonment — (608,160 ) — — (608,160 ) Unrealized foreign exchange loss (gain) 145,971,158 2,996,219 3,708,879 — 152,676,256 Interest expense 63,460,443 3,414,430 898,720 — 67,773,593 Funds provided by (used in) operating activities: Accounts receivable, accounts payable and derivative financial instruments (58,554,144 ) 119,761,648 (27,777,939 ) — 33,429,565 Inventories 108,568 4,547,843 1,511,317 — 6,167,728 Other assets (149,819 ) (16,578,827 ) 126,281 — (16,602,365 ) Employee benefits (10,037,444 ) (94,183,192 ) (11,801,596 ) — (116,022,232 ) Inter-company charges and deductions (310,384,820 ) 30,044,041 31,975,215 248,365,564 — Cash flows provided by operating activities (130,828,575 ) (36,887,423 ) 18,678,494 247,975,290 98,937,786 Investing activities: Acquisition of wells, pipelines, properties, plant and equipment (1,496,277 ) (239,315,507 ) (12,702,217 ) — (253,514,001 ) Investments in associates — — (36,214 ) — (36,214 ) Resources from the sales on share in associates — (130,323 ) 4,547,461 — 4,417,138 (Increase) decrease due to Inter-company investing (39,108,879 ) — — 39,108,879 — Cash flows used in investing activities (40,605,156 ) (239,445,830 ) (8,190,970 ) 39,108,879 (249,133,077 ) Financing activities: Increase in equity due to Certificates of Contributions “A” 10,000,000 (1,915,922 ) 1,844,394 71,528 10,000,000 Loans obtained from financial institutions 345,383,990 — 33,587,088 — 378,971,078 Debt payments, principal only (147,927,857 ) (8,081,177 ) (37,609,464 ) — (193,618,498 ) Interest paid (58,123,368 ) (3,443,923 ) (1,169,859 ) — (62,737,150 ) Inter-company increase (decrease) financing (3,626,448 ) 289,859,173 922,972 (287,155,697 ) — Cash flows provided by financing activities: 145,706,317 276,418,151 (2,424,869 ) (287,084,169 ) 132,615,430 Net (decrease) increase in cash and cash equivalents (25,727,414 ) 84,898 8,062,655 — (17,579,861 ) Effects of change in cash value 11,185,788 1,138,356 (3,363,931 ) — 8,960,213 Cash and cash equivalents at the beginning of the year 73,002,640 5,407,420 39,578,468 — 117,988,528 Cash and cash equivalents at the end of the year Ps. 58,461,014 Ps. 6,630,674 Ps. 44,277,192 Ps. — Ps. 109,368,880

Supplementary Information on Oi

Supplementary Information on Oil and Gas Exploration And Production Activities (Unaudited)	12 Months Ended
	Dec. 31, 2017
Text block1 [abstract]
Supplementary Information on Oil and Gas Exploration And Production Activities (Unaudited)	NOTE 29. 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 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): As of December 31, 2017 2016 2015 Proved reserves Ps. 2,363,336,481 Ps. 2,476,535,503 Ps. 2,102,971,025 Construction in progress 35,381,089 60,720,261 88,706,330 Accumulated depreciation and amortization (1,444,962,317 ) (1,355,402,150 ) (1,224,690,867 ) Net capitalized costs Ps. 953,755,253 Ps. 1,181,853,614 Ps. 966,986,487 b. Costs incurred for oil and gas property exploration and development activities (unaudited): As of December 31, 2017 2016 Exploration Ps. 32,480,801 Ps. 41,661,666 Development 53,460,364 113,895,246 Total costs incurred Ps. 85,941,165 Ps. 155,556,912 There are no property acquisition costs because PEMEX exploits oil reserves owned by the Mexican nation. Exploration costs include costs for geological and geophysical studies of fields amounting to Ps. 8,828,809 and Ps. 6,804,341, for 2017 and 2016, respectively, that, in accordance with the successful efforts method of accounting, are accounted for as geological and geophysical exploration expenses. Development costs include 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): 2017 2016 2015 Revenues from sale of oil and gas Ps. 762,637,362 Ps. 616,380,608 Ps. 690,591,455 Hydrocarbon duties 375,156,405 304,299,019 376,682,705 Production costs (excluding taxes) 248,957,950 171,194,337 177,774,082 Other costs and expenses (3,954,222 ) 61,359,271 20,360,540 Exploration expenses 14,993,433 39,693,273 31,244,564 Depreciation, depletion, amortization and accretion 240,672,906 (150,891,739 ) 527,014,056 875,826,472 425,654,161 1,133,075,947 Results of operations for oil and gas producing activities Ps. (113,189,111 ) Ps. 190,726,447 Ps. (442,484,491 ) Note: Numbers may not total due to rounding. 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): 2017 2016 2015 Weighted average sales price per barrel of oil equivalent (boe) (1) US$ 38.63 US$ 29.18 US$ 37.17 Crude oil, per barrel 48.71 36.55 48.22 Natural gas, per thousand cubic feet 4.32 3.01 3.78 (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, 2017 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. In addition, pursuant to the Reglamento de la Ley de Hidrocarburos (Regulations to the Hydrocarbons Law), on March 23, 2018 the NHC reviewed and approved the proved reserves estimates as of December 31, 2017. Pemex Exploration and Production estimates 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 February 19, 2007 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 2017, 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 Recursos y Certificación de Reservas (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: 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 (Ministry of Public Education), most have earned master’s degrees in areas of study such as petroleum engineering, geology and geophysical engineering and they possess an average of over fifteen years of professional experience. In addition to this internal review process, Pemex Exploration and Production’s final reserves estimates are audited by independent engineering firms. Three independent engineering firms audited Pemex Exploration and Production’s estimates of proved reserves as of December 31, 2017: Netherland Sewell International, S. de R. L. de C. V. (“Netherland Sewell”); DeGolyer and MacNaughton (“DeGolyer”); and Ryder Scott Company, L.P. (“Ryder Scott,”) and, together with Netherland Sewell and DeGolyer and MacNaughton, the “Independent Engineering Firms”. The reserves estimates reviewed by the Independent Engineering Firms totaled 97.0% of PEMEX’s estimated proved reserves. The remaining 3.0% of PEMEX’s estimated proved reserves consisted of reserves located in certain areas in which third parties provide drilling services to Pemex Exploration and Production. Under such agreements, the corresponding third party is responsible of assessing the volume of reserves. Netherland Sewell audited the reserves in the Poza Rica-Altamira, Aceite Terciario del Golfo and Litoral de Tabasco assets. DeGolyer in Burgos and Veracruz Assets and Ryder Scott audited the reserves in the Bellota-Jujo, Cinco Presidentes, Macuspana-Muspac, Samaria-Luna, Abkatún-Pol-Chuc, Ku-Maloob-Zaap 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 decreased by 11.0% in 2017, from 7,219 million barrels at December 31, 2016 to 6,427 million barrels at December 31, 2017. PEMEX’s proved developed reserves of crude oil, condensates and liquefiable hydrocarbons recoverable from processing plants decreased by 14.7% in 2017, from 4,866 million barrels at December 31, 2016 to 4,166 million barrels at December 31, 2017. These decreases were principally due to oil production in 2017, a decrease in field development activities and field behavior and the transfer to third parties, who were awarded with contracts in the bidding rounds, of certain fields that had been temporarily assigned to PEMEX and associations and alliances such as Santuario and El Golpe fields, of which PEMEX is assigned a 64% of their proved reserves . The amount of crude oil, condensate and liquefiable hydrocarbon reserves added in 2017 was insufficient to offset the level of production in 2017, which amounted to 805.5 million barrels of crude oil, condensates and liquefiable hydrocarbons. PEMEX’s proved developed and undeveloped dry gas reserves decreased by 5.6% in 2017, from 6,984 billion cubic feet at December 31, 2016 to 6,593 billion cubic feet at December 31, 2017. PEMEX’s proved developed dry gas reserves decreased by 10.8% in 2017, from 4,513 billion cubic feet at December 31, 2016 to 4,026 billion cubic feet at December 31, 2017. These decreases were principally due to oil production in 2017, a decrease in field development activities and field behavior and the transfer to third parties, who were awarded with contracts in the bidding rounds, of certain fields that had been temporarily assigned to PEMEX and associations and alliances such as Santuario and El Golpe fields, of which PEMEX is assigned a 64% of their proved reserves. The amount of dry gas reserves added in 2017 was insufficient to offset the level of production in 2017, which amounted to 999 billion cubic feet of dry gas. PEMEX’s proved undeveloped dry gas reserves increased by 3.9% in 2017, from 2,471 billion cubic feet at December 31, 2016 to 2,567 billion cubic feet at December 31, 2017. During 2017, our exploratory activity in the shallow waters of the Gulf of Mexico and onshore regions resulted in new discoveries of light crude oil in the offshore Suuk field in June 2017 and gas and condensate discoveries in the onshore Valeriana and lxachi fields in August and November of 2017, respectively. These discoveries led to the incorporation of approximately 246 million barrels of oil equivalent in three fields. 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 Condensates (2) Dry Gas (3) (in millions of barrels) (in billions of cubic feet) Proved developed and un-developed Proved developed reserves 4,166 4,026 Proved undeveloped reserves 2,261 2,567 Total proved reserves 6,427 6,593 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) 2017 2016 2015 (in millions of barrels) Proved developed and undeveloped reserves: At December 31 7,219 7,977 10,292 Revisions (2) (95 ) 189 (1,491 ) Extensions and discoveries 147 (55 ) 111 Production (805 ) (891 ) (935 ) Farm outs & transfer of fields due to NHC bidding process (38 ) — — At December 31 6,427 7,219 7,977 Proved developed reserves at December 31 4,166 4,886 5,725 Proved undeveloped reserves at December 31 2,261 2,333 2,252 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 2017 2016 2015 (in billions of cubic feet) Proved developed and undeveloped reserves: At December 31 6,984 8,610 10,859 Revisions (1) 169 (183 ) (955 ) Extensions and discoveries 468 (308 ) 47 Production (2) (999 ) (1,134 ) (1,341 ) Farm outs & transfer of fields due to NHC bidding process (29 ) — — At December 31 6,593 6,984 8,610 Proved developed reserves at December 31 4,026 4,513 6,012 Proved undeveloped reserves at December 31 2,567 2,471 2,598 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 2017, we obtained an increase of 174.2 million barrels of oil equivalent of proved reserves as aggregated from discoveries, revisions, delimitations and development and production, which represents a RRR of 17.5 %. PEMEX’s 2017 RRR is an improvement as compared to 2016, when the RRR was 4.0%. PEMEX expects continued improvements in its RRR in subsequent years. PEMEX’s reserves production ratio, 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, 2017, this ratio stayed constant with 2016 levels and was equal to 7.7 years for proved reserves. 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 2042. 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 2017. 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 fiscal regime applicable by decree to Pemex-Exploration and Production effective January 1, 2015 and by the tax benefits published in the Official Gazette of the Federation on April 18, 2016. 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 2017 2016 2015 (in millions of U.S. dollars) Future cash inflows US$ 269,489 US$ 228,196 US$ 325,052 Future production costs (excluding profit taxes) (114,369 ) (87,942 ) (99,948 ) Future development costs (26,229 ) (25,515 ) (32,560 ) Future cash flows before tax 128,891 114,738 192,544 Future production and excess gains taxes (129,377 ) (108,960 ) (167,056 ) Future net cash flows (487 ) 5,779 25,488 Effect of discounting net cash flows by 10% (4,600 ) (937 ) (9,946 ) Standardized measure of discounted future net cash flows US$ 4,113 US$ 4,841 US$ 15,541 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 2017 2016 2015 (in millions of U.S. dollars) Sales of oil and gas produced, net of production costs US$ (25,076 ) US$ (19,411 ) US$ (28,371 ) Net changes in prices and production costs 26,355 (53,278 ) (327,865 ) Extensions and discoveries 3,639 1,105 3,086 Development cost incurred during the year 2,699 4,124 10,172 Changes in estimated development costs 2,744 1,763 (2,171 ) Reserves revisions and timing changes (1,353 ) 6,366 (22,801 ) Accretion of discount of pre-tax 5,891 11,094 43,394 Net changes in production and excess gains taxes (15,628 ) 37,537 295,437 Aggregate change in standardized measure of discounted future net cash flows US$ (728 ) US$ (10,700 ) US$ (29,119 ) Standardized measure: As of January 1 US$ 4,841 US$ 15,541 US$ 44,661 As of December 31 4,113 4,841 15,541 Change US$ (728 ) US$ (10,700 ) US$ (29,119 ) 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 Polici35

Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2017
Text block1 [abstract]
Basis of consolidation	a. Basis of consolidation The consolidated financial statements include those of Petróleos Mexicanos, the Subsidiary Entities and the Subsidiary Companies. All intercompany balances and transactions of the consolidated companies; income and expenses, as well as unrealized profits and losses resulting from operations between them have been eliminated in the preparation of the consolidated financial statements pursuant to IFRS 10, “Consolidated Financial Statements” (“IFRS 10”). Unrealized gains arising from transactions with entities whose investment is accounted for using the equity method are eliminated against the investment to the extent of PEMEX’s participation in such entities. Unrealized losses are eliminated in the same way as unrealized gains but only to the extent that there is no evidence of impairment of the investment. If such evidence exists, PEMEX recognizes it in its consolidated financial statements. Investment in subsidiaries The Subsidiary Entities and Subsidiary Companies are consolidated from the date that control commences until the date that control ceases. Petróleos Mexicanos controls a subsidiary when it is exposed to or has rights to variable returns from the company and has the ability to affect those returns through its power over the company. The financial statements of the Subsidiary Entities and Subsidiary Companies have been prepared based on the same period of Petróleos Mexicanos’ consolidated financial statements applying the same accounting policies. For more information about Subsidiary Companies, see Note 4. Investments in associates and joint arrangements Associates are those entities in which PEMEX has significant influence but not the power to control financial and operational decisions. It is presumed that there is significant influence when PEMEX owns directly or indirectly between 20% and 50% of voting rights in another entity. Joint arrangements are those arrangements whereby two or more parties have joint control of an arrangement. A joint arrangement is either a joint venture, where both of the parties have rights to the net assets of the arrangements, or a joint operation, where the parties have both rights to the assets, and obligations for the liabilities relating to the arrangements. Investments in associates and joint ventures are recognized based on the equity method and recorded initially at cost, including any goodwill identified on acquisition. With respect to joint operations, the assets, liabilities, income and expenses are recognized in relation to the share of each party and in accordance with the applicable IFRS for each of those items. The investment cost includes transaction costs. These consolidated financial statements include the proportion of gains, losses and other comprehensive income corresponding to PEMEX’s share in each investee, once these items are adjusted to align with the accounting policies of PEMEX, from the date that significant influence and joint control begins to the date that such 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 associates and joint arrangements, see Note 11. Non-controlling The equity interests of third parties who do not have a controlling interest in the equity or comprehensive result of subsidiaries of PEMEX are presented in the consolidated statements of financial position, the consolidated statements of changes in equity (deficit) as “non-controlling non-controlling Changes in a parent’s ownership interest in a subsidiary that do not result in a loss of control are accounted for as equity transactions. In such circumstances, the carrying amounts of the controlling and non-controlling Dividends in cash and assets other than cash A liability for distributions of dividends in cash and non-cash Distributions of dividends in non-cash When distributing non-cash
Business combinations and goodwill	b. Business combinations and goodwill Business combinations are accounted for using the acquisition method. The cost of an acquisition is measured as the aggregate of the consideration transferred, measured as the acquisition date fair value, and the amount of any non-controlling When PEMEX acquires a business, it assesses the acquired assets and liabilities in order to appropriately classify and designate each, taking into account the contractual terms, economic circumstances and other pertinent conditions as of the date of the acquisition. This includes the separation of embedded derivatives in host contractors by the acquiree. Acquired petroleum reserves and resources that can be reliably measured are recognized separately in the assessment of fair values on acquisition. Other potential reserves and rights, for which fair values cannot be reliably measured, are not recognized separately, but instead are subsumed in goodwill. For business combinations achieved in stages, any previously held equity interest is measured at its acquisition date fair value, and any resulting gain or loss is recognized in income or loss or other comprehensive income. Any contingent consideration to be transferred by the acquirer will be recognized at fair value on the acquisition date. Contingent consideration classified as an asset or liability that is a financial instrument and within the scope of IAS 39 “Financial instruments: Recognition and Measurement” is measured at fair value, with changes in fair value recognized in income or loss or other comprehensive income. If contingent consideration is not with the scope of IAS 39, it is measured in accordance with the appropriate IFRS requirement. Contingent consideration that is classified as equity is not remeasured, and subsequent settlement is accounted for within equity. Goodwill, which is initially measured at cost, is the excess of the aggregate of the consideration transferred and the amount recognized for non-controlling After initial recognition, goodwill is measured at cost less any accumulated impairment losses. For the purpose of impairment testing, goodwill acquired in a business combination is, from the acquisition date, allocated to each cash generating unit that is expected to benefit from the combination, irrespective of whether other assets or liabilities of the acquiree are assigned to those units. When goodwill is allocated to a cash generating unit and certain of the operations in that unit are disposed of, the goodwill associated with the disposed operation is included in the carrying amount of the operation when determining the gain or loss on disposal. Goodwill disposed in these circumstances is measured based on the relative values of the disposed operation and the portion of the cash generating unit retained.
Transactions in foreign currency	c. Transactions in foreign currency In accordance with IAS 21, “The Effects of Changes in Foreign Exchange Rates” (“IAS 21”), transactions in foreign currencies are translated and recorded at exchange rates at the dates of the transactions and/or of the presentation of financial information. Exchange differences arising from the settlement of monetary items or from the translation of monetary items into rates different from those at which they were translated on their initial recognition, are recognized in the results of operations in the reporting period in which they arise. When a gain or loss from a non-monetary non-monetary
Fair value measurement	d. Fair value measurement PEMEX measures certain financial instruments such as DFIs at fair value as of the closing date of the relevant reporting period. 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. A measurement at fair value assumes that the sale of the asset or transfer of a liability occurs: i. in the principal market for the asset or liability; or ii. in the absence of a principal market, in the most advantageous market for the asset or liability. The principal market or the most advantageous market must be accessible for PEMEX. The fair value of an asset or liability is measured by using the same assumptions that market participants would make when pricing the asset or liability under the premise that market participants take into account highest and best use of the asset or liability.
Financial instruments	e. Financial instruments Financial instruments are classified as: (i) financial instruments measured at fair value through profit or loss; (ii) financial instruments held to maturity; (iii) available-for-sale PEMEX’s financial instruments include cash and short-term deposits, available-for-sale Below are descriptions of the financial instruments policies employed by PEMEX: Financial instruments measured at fair value through profit or loss A financial instrument is measured at fair value through profit or loss if it is classified as held for trading or designated as such upon initial recognition. Financial assets are designated at fair value through profit or loss if PEMEX manages such investments and makes purchase and sale decisions based on their fair value in accordance with PEMEX’s documented risk management or investment strategy. In addition, directly attributable transaction costs are recognized in the consolidated statements of comprehensive income for the year. These financial instruments are recognized at fair value and corresponding changes relating to dividend income are recognized in the consolidated statements of comprehensive income. Available-for-sale Available-for-sale non-DFIs available-for-sale available-for-sale Available-for-sale Subsequent to initial recognition, available-for-sale Sales and purchases of financial assets that require the delivery of such assets within a period of time established by market practice are recognized as of the negotiation date (the date on which PEMEX commits to purchase or sell the asset). Loans and receivables Loans and receivables are initially recognized at fair value. After initial recognition, loans and debt securities that bear interest are measured at amortized cost using the effective interest rate (“EIR”) method, less impairment losses. The amortized cost is calculated based on any discount or premium on acquisition and fees and costs that are an integral part of the EIR method. Amortization of costs is included under the heading of financing cost in the consolidated statements of comprehensive income. Derivative financial instruments DFIs presented in the consolidated statements of financial position are carried at fair value. In the case of DFIs held for trading, changes in fair value are recorded in profit or loss; in the case of DFIs formally designated as and that qualify for hedging, changes in fair value are recorded in the consolidated statements of comprehensive income using cash flow or fair value hedge accounting, with gains or losses classified in accordance with the earnings treatment of the hedge transaction. Embedded derivatives PEMEX evaluates the potential existence of embedded derivatives, which may be found in the terms of its contracts, or combined with other host contracts, which could be structured financial instruments (debt or equity instruments with embedded derivatives). Embedded derivatives have terms that implicitly or explicitly meet the characteristics of a DFI. In some instances, these embedded derivatives must be segregated from the underlying contracts and measured, recognized, presented and disclosed as DFIs, such as when the economic risks and terms of the embedded derivative are not clearly and closely related to the underlying contract. Impairment of financial assets At each reporting date, PEMEX evaluates whether there is objective evidence that a financial asset or group of financial assets is impaired, in which case the value of the recoverable amount of the asset is calculated. A financial asset is impaired if objective evidence indicates that a loss event has occurred after the initial recognition of the asset, and that the loss event had a negative effect on the estimated future cash flows of the financial asset. Objective evidence that a financial asset or group of assets is impaired includes significant financial difficulty of the issuer or obligor, a breach of contract, such as a default or delinquency in interest or principal payments; the lender, for economic or legal reasons relating to the borrower’s financial difficulty, granting to the borrower a concession that the lender would not otherwise consider; it becoming probable that the borrower will enter bankruptcy or other financial reorganization; the disappearance of an active market for that financial asset because of financial difficulties; or observable data indicating that there is a measurable decrease in the estimated future cash flows. Impairments by asset are: Impairment of financial assets carried at amortized cost The impairment of financial assets carried at amortized cost is measured as the difference between the assets carrying amount and the present value of estimated future cash flows (excluding future credit losses that have not been incurred) discounted at the financial asset’s original effective interest rate. The amount of the loss shall be recognized in profit or loss. If, in a subsequent period, the amount of the impairment loss decreases and the decrease can be related objectively to an event occurring after the impairment was recognized, the impairment loss previously recognized shall be reversed in profit or loss. Impairment in available—for—sale financial assets In addition to the above-mentioned, a significant or prolonged decline in the fair value of an investment in an available—for—sale equity instrument is also objective evidence of impairment. When there is objective evidence of the impairment of an asset, the accumulated loss recognized in other comprehensive income shall be reclassified from equity to profit or loss even though the financial asset has not been derecognized. If, in a subsequent period, the impairment loss decreases, the reversal shall be reflected as a reversal in other comprehensive income.
Cash and cash equivalents	f. Cash and cash equivalents Cash and cash equivalents are comprised of cash balances on hand, net of overdrafts, deposits in bank accounts, foreign currency reserves and instruments with maturities of three months or less from the acquisition date that are subject to an insignificant risk of changes in their fair value, which are used in the management of PEMEX’s short-term commitments. Cash subject to restrictions or that cannot be exchanged or used to settle a liability within 12 months is presented as non-current
Inventories and cost of sales	g. 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 formula. 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	h. Wells, pipelines, properties, plant and equipment Wells, pipelines, properties, plant and equipment are recorded at acquisition or construction cost less accumulated depreciation and accumulated impairment losses. PEMEX uses the successful efforts method for the exploration and production of crude oil and gas activities, considering the criteria mentioned in IFRS 6, “Exploration for and Evaluation of Mineral Resources” in relation to the recognition of exploration and drilling assets. Costs of development wells and related plant, property and equipment involved in the exploitation of oil and gas are recorded as part of the cost of assets. The costs of exploratory wells in areas that have not yet been designated as containing proved reserves are recorded as intangible assets until it is determined whether they are commercially viable to capitalize as fixed assets, otherwise they are recognized as exploration expenses. Other expenditures on exploration are recognized as exploration expenses as they are incurred. In accordance with IAS 16, “Property, Plant and Equipment” (“IAS 16”), 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 the cost of plugging of wells and removal. 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. 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. 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. When parts of an item of wells, pipelines, properties and equipment are significant relative to the total cost of the item, the part is depreciated separately. Estimated useful lives of items of properties, plant and equipment are reviewed if expectations differ from previous estimates. Pipelines, properties, and equipment received from customers are initially recognized at fair value as revenue from ordinary operating activities if PEMEX has no future obligations to the customer who transferred the item. In contrast, if PEMEX does have future obligations to such a customer, the initial recognition is recorded as a deferred liability based on the period in which the assets will provide services to the customers. The capitalized value of finance leases is also included in the line item of wells, pipelines, properties, plant and equipment. Properties, plant and equipment acquired through financial leases are depreciated over the shorter of the lease term or the useful life of the asset. 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.
Crude oil and natural gas reserves	i. 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	j. 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 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 statement of comprehensive income.
Leases	k. Leases The determination of whether an agreement is or contains a lease is based on the economic substance of the agreement at the date of execution. An agreement contains a lease if performance under the agreement depends upon the use of a specific asset or assets, or if the agreement grants the right to use the asset. Finance leases, which transfer to PEMEX substantially all the inherent benefits and risks of the leased property, are capitalized at the date the lease commences, and the value is recorded as the lower of the fair value of the leased property and the present value of the minimum lease payments. Payments on the lease are divided between the financial costs and the amortization of the remaining debt principal in order to achieve a constant effective interest rate for the outstanding liability. The financing costs are recognized in the statement of comprehensive income. Operating lease payments are recognized as expenses in the statement of comprehensive income on a straight line basis over the term of the lease and variable rent payments are recognized in the operating results on an accrued basis.
Provisions	l. Provisions 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
Employee benefits	m. Employee benefits Beginning January 1, 2016, Petróleos Mexicanos and the Subsidiary Entities have operated both a defined contribution plan and a defined benefit pension plan. Until December 31, 2015, PEMEX only operated a defined benefit pension plan. Defined contribution pension plan In this plan, both Petróleos Mexicanos and the Subsidiary Entities and their respective employees contribute to the worker’s individual account. PEMEX’s contributions are recognized on an accrual basis as cost, expense or asset, and are credited to liability. Contributions to the defined contribution plan that are not expected to be fully settled within 12 months after the end of the annual reporting period in which the employee rendered related services will be discounted using the defined benefit plan discount rate. Defined benefit plan Under the defined benefit plan, Petróleos Mexicanos and the Subsidiary Entities are the only parties that contribute to a trust, which is managed separately. Petróleos Mexicanos and the Subsidiary Entities recognize the cost for defined benefit plans based on independent actuarial computations applying the projected unit credit method. Actuarial gains and losses are recognized within other comprehensive results for the period in which they are determined. The costs of prior services are recognized within profit or loss for the period in which they are determined. The asset or liability in the defined benefit plan comprises the present value of the defined benefit obligation less the fair value of plan assets for which obligations have to be settled. The value of any asset is limited to the present value of any economic benefit represented by the plan reimbursements or reductions of the future contributions to the plan. In addition, other long term employee benefits include the seniority premiums payable for disability, death and survivors benefits, medical services, gas and basic food basket for beneficiaries. Termination benefits are recognized in profit or loss for the year in which they are incurred.
Income taxes and duties	n. Income taxes and duties Current income tax Current income tax assets or liabilities for the current and prior years are measured as the amount expected to be paid or to be recovered from the tax authorities, using either the tax rates in force or tax rates which are in the process of being approved and are substantially completed by the end of the year. Current income taxes related with items that are recognized as equity are presented in the other comprehensive income of the year. Periodically, PEMEX evaluates the positions taken in its tax returns for those regulations that are subject to interpretation and books corresponding provisions, if it is deemed necessary. Deferred income taxes Deferred taxes are recorded based on the assets and liabilities method, which consists of the recognition of deferred taxes by applying tax rates applicable to the income tax to the temporary differences between the carrying value and tax values of assets and liabilities at the date of these consolidated financial statements. Deferred tax liabilities are recognized for all taxable temporary differences, except to the extent that the deferred tax liability arises from: • the initial recognition of goodwill or the initial recognition of an asset or liability in a transaction which is not a business combination and at the time of the transaction, affects neither accounting profit nor taxable profit or tax loss; and • taxable temporary differences associated with investments in subsidiaries, branches and associates, and interest in joint arrangements, when the parent, investor, joint venture or joint operator is able to control the timing of reversal of the temporary difference and it is probable that the temporary difference will not reverse in the foreseeable future. Deferred tax assets are recognized for all deductible temporary differences and the carry forward of both unused tax credits and unused tax losses to the extent that it is probable that taxable profit will be available against deductible temporary differences, and that the carry forward of both unused tax credits and unused tax losses can be utilized, unless: • the deferred tax asset relating to deductible temporary difference arises from the initial recognition of asset or liability derived from a transaction that is not a business combination and, at the time of the transaction, affects neither accounting profit nor taxable profit or tax loss; and • in respect of deductible temporary differences associated with investments in subsidiaries, associates and interests in joint ventures, deferred tax assets are recognized only to the extent that it is probable that the temporary differences will reverse in the foreseeable future and taxable profit will be available, against which the temporary differences can be utilized. The carrying amount of a deferred tax asset is reviewed at the end of each reporting period. PEMEX reduces the carrying amount of a deferred tax asset to the extent that it is no longer probable that a sufficient taxable profit will be available to allow the benefit of that deferred tax asset to be utilized in whole or in part. Unrecognized deferred tax assets are revalued at each reporting date and will be recognized to the extent that it is probable that future taxable income will be sufficient to allow for the recovery of the deferred tax asset. Deferred tax assets and liabilities are measured at the tax rates that are expected to apply to the period when the asset is realized or the liability is settled, based on tax rates (and tax laws) that have been enacted or substantively enacted by the end of the reporting period. Deferred tax assets and deferred tax liabilities related with items that are recognized in equity shall be presented directly in other comprehensive income. Deferred tax assets and deferred tax liabilities are offset if PEMEX has a legal right to set off current tax assets against current tax liabilities and are levied by the same taxation authority or the same taxable entity. Income taxes and 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 on a formula that considers the balance of income (or extraction valued at a selling price) less expenses. Taxes and duties that meet this criteria should be recognized for current and deferred income tax based on the above paragraphs. Taxes and duties that do not meet this criteria are recognized as liabilities, affecting the costs and expenses relating to the transactions that gave rise to them.
Impuesto Especial sobre Produccion y Servicios	o. Impuesto Especial sobre Producción y Servicios (Special Tax on Production and Services, or “IEPS Tax”) The IEPS Tax charged to customers is a withholding tax on domestic sales of gasoline, diesel and fossil fuels. The applicable quotas depend on, among other factors, the product, producer’s price, freight costs, commissions and the region in which the respective product is sold. The withholding tax does not affect the results of PEMEX.
Contingencies	p. 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 revenues, earnings or assets are not recognized until realization is assured.
Revenue recognition	q. Revenue recognition Sales revenue is recognized at the moment when the risks and benefits of ownership of crude oil, refined or gas products, and derivative and petrochemical products are transferred to the customers who acquire them, which occurs as follows: • in accordance with contractual terms; • the moment at which the customer picks up product at PEMEX’s facilities; or • the moment at which PEMEX delivers the product to the delivery point. Services rendered are recognized as services income when the customers accept the receipt of the services.
Presentation of consolidated statements of comprehensive income	r. Presentation of consolidated statements of comprehensive income The costs and expenses shown in PEMEX’s consolidated statements of comprehensive 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. Revenues Represents revenues from sale or products or services. Cost of sales Cost of sales represents the acquisition and production costs of inventories at the time of sale. Cost of sales mainly includes 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. Other revenues (expenses), net Other revenues (expenses), net 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. 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. Derivative financial instruments (cost) income, net Derivative financial instruments (cost) income represents the net effect of the profit or loss for the year associated with DFIs. Foreign exchange loss, net Exchange rate variations relating to assets or liabilities governed by contracts denominated in foreign currencies are recorded in income (loss) for the year.
Operating segments	s. Operating segments Operating segments are identifiable components of PEMEX that pursue business activities from which PEMEX earns revenues and incurs expenses, including those revenues and expenses from transactions with other segments of PEMEX, 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.
Non-current assets held for sale, non-current assets held for distribution to owners and discontinued operations	t. Non-current non-current Non-current PEMEX classifies a non-current Non-current Non-current The liabilities of a disposal group classified as held for sale are presented separately from other liabilities in the statement of financial position. Those assets and liabilities are not offset and are presented as a single amount. Non-current When PEMEX agrees to distribute a non-current non-current Non-current Non-current The liabilities of a disposal group classified as held for distribution to owners are presented separately from other liabilities in the statement of financial position. Those assets and liabilities shall not be offset and shall be presented as a single amount. Discontinued operations A discontinued operation is a component of an entity that either has been disposed of or is classified as held for sale, and either: • represents a separate major line of business or geographical area of operations; • is part or a single coordinated plan to dispose of a separated major line of business or geographical area of operations; or • is a subsidiary acquired exclusively with a view to resale. The revenues or expenses from discontinued operations, including profits or losses from previous years, are presented in a specific line item in the consolidated statements of comprehensive income.
Accounting changes	u. Accounting changes The IASB issued new amendments to the IFRS mentioned below, which are applicable to PEMEX and are effective for annual periods beginning January 1, 2017: a) IAS 12 “Income Taxes: Recognition of Deferred Tax Assets for Unrealized Losses” (“IAS 12”) The IASB issues amendments to IAS 12 to clarify the diversity of practices in the recognition of deferred tax assets for unrealized losses related to debt instruments measured at fair value. The amendments to IAS 12 include some explanatory paragraphs and an illustrative example. The amendments clarify the following aspects of IAS 12: • Unrealized losses on debt instruments measured at fair value for accounting purposes and measured at cost for tax purposes give rise to deductible temporary differences regardless of whether the debt instrument’s holder expects to recover the carrying amount of the debt instrument by sale or by use. • The carrying amount of an asset does not limit the estimation of probable future taxable profits. • Estimates of future taxable profits exclude tax deductions resulting from the reversal of deductible temporary differences. • An entity assesses a deferred tax asset in combination with other deferred tax assets. Where tax law restricts the utilization of tax losses, an entity would assess a deferred tax asset in combination with other deferred tax assets of the same type. The amendments are to be applied retrospectively and are effective for annual periods beginning on or after January 1, 2017. Earlier application is permitted. These amendments had no impact on these consolidated financial statements. b) Amendments to IAS 7 “Statement of Cash Flows” (“IAS 7”) The IASB issued amendments to IAS 7. The amendments are intended to clarify disclosure provided to the user of financial statements about an entity’s financing activities. Changes The amendments in IAS 7 come with the objective that entities shall provide disclosures that enable users of financial statements to evaluate changes in liabilities arising from financing activities. To achieve this objective, the IASB requires that the following changes in liabilities arising from financing activities are disclosed: (i) changes from financing cash flows; (ii) changes arising from obtaining or losing control of subsidiaries or other businesses; (iii) the effects of changes in foreign exchange rate; (iv) changes in fair values; and (v) other changes. The IASB defines liabilities arising from financing activities as liabilities “for which cash flows were, or future cash flows will be, classified in the statements of cash flows as cash flows from financing activities.” It also stresses that the new disclosure requirements also relate to changes in financial assets if they meet the same definition. The amendments state that one way to fulfill the new disclosure requirements is to provide reconciliation between the opening and closing balances in the statement of financial position for liabilities arising from financing activities. Finally, the amendments state that changes in liabilities arising from financing activities must be disclosed separately from changes in other assets and liabilities. The amendments are effective for annual periods beginning on or after January 1, 2017. Earlier application is permitted. Entities need not provide comparative information when they first apply the amendments. Impacts on this amendments are disclosed in Note 15. c) IFRS 12 “Disclosure of Interest in Other Entities” (“IFRS 12”)—Annual Improvements to IFRS 2014—2016 Cycle. As of December 2016, the IASB published Annual Improvements to IFRS 2014—2016 Cycle, which clarified the scope of IFRS 12, by specifying that the disclosure requirements apply to all subsidiaries, joint arrangements, associates and unconsolidated structured entities classified as held for sale, held for distribution or as discontinued operations in accordance with IFRS 5, with certain exceptions. The amendments are going to be applied restrospectively and are effective for annual periods beginning on or after January 1, 2017. These improvements had no impact on these consolidated financial statements.
New accounting policies not yet adopted	v. New IFRS not yet adopted The IASB issued amendments and new IFRS that are not effective as of December 31, 2017 but that could have an impact on subsequent PEMEX financial statements. Amendments effective for periods beginning in 2018: a) IFRS 15, “Revenue from Contracts with Customers” (“IFRS 15”) The core principle of the new IFRS 15 is that an entity should recognize revenue as the promised transfer of goods or services to the customer, valued at the amount that the entity expects to be entitled in exchanged for those goods or services. Pursuant to IFRS 15, an entity should: • identify customer contracts that fall within the scope of the new standard; • identify the separate performance obligations in the contract based on the following criteria: (i) sales of goods or services, separately, (ii) sales that are dependent or interrelated with other products or services; and (iii) homogeneous and consistent sales pattern; • determine the price of the transaction by applying the following considerations: (i) variable consideration and constraining estimates of variable consideration; (ii) the existence of a significant financing component in the contract; (iii) any non-cash • allocate the transaction price to each separate performance obligation; and • recognize revenue when (or as) each performance obligation is satisfied either over time or at a point in time. The new IFRS 15 enhances disclosures of revenue. This standard must be applied for periods beginning on or after January 1, 2018, and early application is permitted. During the year of application, entities may apply the rule retrospectively or use a modified approach. PEMEX will adopt IFRS 15 retrospectively with the cumulative effect of applying the new standard recognized at the date of initial adoption (January 1, 2018) as an adjustment to the opening balance of retained earnings or other component of equity, as applicable. Under this transition method, PEMEX elected to apply this standard retrospectively only to contracts that were not completed contracts at January 1, 2018. For contracts that have been completed before December 31, 2017, with revenues not fully recognized as of that date, the current accounting policies under IAS 18 will continue to apply when recognizing revenue of those contracts during 2018. For contracts that take effect from January 1, 2018, revenue will be recognized in accordance with IFRS 15. As part of the implementation of IFRS 15, different types of revenue from contracts with customers have been identified, evaluated and documented, as well as the main changes in accounting policies that will be reflected as of January 1, 2018 with respect to new contracts. The main changes in accounting policies are as follows: i. Sale of products with other services: The adoption of IFRS 15 will affect the manner in which PEMEX records the sale of products including oil, refined products, gas, petrochemicals, fertilizers and other sales. Until December 31, 2017, freight and other services, for example were recognized separately from products sold. Under IFRS 15, revenue is recognized with respect to the performance obligation under the contract, and so certain services that are currently accounted for separately, will now be presented as a single performance obligation together with the sale of the product. ii. Services: Services include transportation and storage of hydrocarbons, petroleum, petrochemicals, refined products, gas, petrochemical derivatives and others. Rental services and some transportation services are currently presented in the revenues from services line item in the income statement. In many cases of services with components of leases are less than one year operating leases. Revenues corresponding to leasing have not been presented separately from revenues from services. Under IFRS 15, leases cannot be presented in the same line item as revenues from service. The main change in accounting policy will be the separation and presentation of service and lease components. iii. Determination of the transaction price: Refunds, discounts, quantity and quality claims (in favor or against) and penalties (to customers or PEMEX) or breaches related to the sale of certain products were previously recognized as revenues. However, under IFRS 15, revenues will only be recognized if it is highly probable that there will not be a significant reversal in the revenue received. As a result, PEMEX will put in place mechanisms to approximate the refunds, discounts, quantity and quality claims and penalties at the time that the control of the product is transferred. Revenue recognition Revenues are currently recognized when the risks and benefits of the product are transferred, which occurs when the customer picks up or receives the product at PEMEX´s facilities or at a specific point of sale, accepts the products and assumes the risks and benefits related to the transfer of ownership. Under IFRS 15, revenues from sale of products are recognized when the contractual obligation is satisfied, and control of the products is transferred to the customer. There will be changes in the revenue recognition of gas sale and certain services from “one point in time” to “over time”. However, a significant change is not expected because in some cases the practical expedient “right to invoice” will be applied to measure progress towards completion of the transaction. As of December 31, 2017, PEMEX did not identify any significant uncompleted contracts. As a result, PEMEX has determined that the changes to amounts in prior years will not be significant. Nonetheless, there will be important changes in accounting policies for contracts issued as of January 1, 2018. b) IFRS 9, “Financial Instruments” (“IFRS 9”(2014)) In July 2014, the IASB finalized the accounting reform of financial instruments and issued IFRS 9 (revised in 2014), which contains the requirements for, a) the classification and measurement of financial assets and liabilities, b) impairment methodology, and c) general information about hedge accounting. IFRS 9 (revised in 2014) replaces IAS 39 Financial Instruments: Recognition and Measurement as of its effective date. These requirements should be applied retrospectively and, as permitted by IFRS 9 transitional provisions, it is not necessary for companies to restate comparative figures. Any adjustment in the carrying amounts of the financial assets and liabilities at the transition date is recognized by affecting the cumulative effect in the initial opening period. The classification criteria depends on a combination of two important factors: i. the business model within the financial asses is held (the business model test); and ii. the contractual cashflow of the financial asset (the SPPI test). Based on these two tests, the asset can be measured as follows: • Amortized cost: Financial Instruments under a business model whose objective is only the collection of contractual cash flows which are composed of principal and interest payments and where there are no significant sales unjustified and fair value is not a key factor in the management of these financial assets and the characteristics of cash flows represent substantially a “basic loan agreement” or SPPI. Unjustified sales are different from sales related to an increase in the credit risk of an asset or unexpected financing needs. • Fair value with changes through other comprehensive income (“FVOCI”): Financial Instruments in a business model whose objective is to obtain cash flows and the sale of those assets, where fair value is a key factor in its management. In addition, the characteristics of the contractual cash flows represent substantially a “basic loan agreement”. • Fair value with changes through profit or loss (“FVPL”): Financial instruments in a business model whose objective is not the aforementioned models, where fair value is a key factor in the management of these assets, and the financial instruments whose contractual cash flow characteristics do not substantially represent a “basic loan agreement”. IFRS also replaces the impairment model of IAS 39 (the “loss incurred model”) with a new impairment model called the “expected credit loss” model. This impairment model will be applicable to financial assets that are not measured at FVPL. Changes in fair value of financial assets through FVOCI to the point of disposal are recorded in OCI. The expected credit loss recognized for impairment purposes under IFRS 9 will be equivalent to a 12-month IFRS 9 Implementation and government strategy PEMEX has established a multidisciplinary working group with the objective to adapt its processes to the new standard in relation to the classification and measurement of financial instruments and the impairment estimation of credit risk, ensuring that these processes have been applied and adopted in accordance with IFRS 9. Regarding classification and measurement, PEMEX carried out an analysis of its financial assets in order to identify those that could trigger a change in the accounting methodology, due to the definition of the business model and a failure to satisfy the SPPI test. IFRS 9 Implementation analysis PEMEX has defined January 1, 2018 as the initial date of adoption of IFRS 9 “Financial Instruments” and according to the transitional standard in IFRS 9, PEMEX will not restate previous periods for comparison purposes and any difference that may arise as a result of the adoption of IFRS 9 between the previous carrying amount and the carrying amount at the beginning of the reporting period shall be recognized in accumulated results over the opening initial period. PEMEX has concluded that most of its financial assets will continue to be classified in the same way: Classification Assets IAS 39 IFRS 9 Change Cash and cash equivalents FVPL FVPL No Available—for—sale financial assets FVOCI FVOCI No Derivative financial instruments FVPL FVPL No Long—term notes receivable Amortized Cost Amortized Cost No Capital or debt instruments classified as available-for-sale PEMEX has concluded that the financial assets most affected by the impairment estimate under the expected credit loss model will be its accounts receivables, in relation to PEMEX’s holding of the long-term notes issued by the Mexican Government. The evaluation of the possible impairment of the notes will be made using the general approach for calculating impairment of the notes will be made using the general approach for calculating impairment contemplated under IFRS 9. PEMEX considers it probable that impairment losses increase and present more volatility for instruments under the new methodology of expected credit losses. Furthermore, PEMEX considers that most of its accounts receivable are short-term without a significant financial component, so the simplified approach will be applied. The preliminary evaluation of PEMEX indicates that the application of the new impairment requirements of IFRS 9 as of December 31, 2017 will impact the accounts receivable reserves as of January 1, 2018. An increase between 39.0% and 51.1% is expected in the accounts receivable reserves as compared to impairment losses incurred in accordance with IAS 39. Hedge accounting PEMEX, as part of the initial adoption, elected to continue applying the hedge accounting requirements of IAS 39 instead of IFRS 9. PEMEX uses DFI’s to cover the exposure of foreign currency risk, interest rate risk and fluctuations in the price of its products, but these contracts are not accounted for as designated hedges. DFI’s are initially recognized at fair value on the date the derivative contract is entered into and after initial recognition are measured again at fair value. As a result, PEMEX has determined that the changes to amounts in prior years will not be significant. c) Interpretation of IFRIC 22 “Foreign Currency Transactions and Advance Considerations” (IFRIC 22) As of December 2016, IASB published an interpretation of IFRIC 22 developed by the International Financial Reporting Standards Interpretations Committee (the Interpretations Committee). The interpretation clarified when to recognize payments and collections of foreign currency transactions paid in advance. According to the interpretations, an entity must recognize foreign currency transactions when: i. there is consideration that is denominated or priced in a foreign currency; ii. the entity recognizes a prepayment asset or a deferred income liability in respect of that consideration, in advance of the recognition of the related asset, expense or income; and iii. the prepayment asset or deferred income liability is non-monetary. The Interpretations Committee concluded that: • The date of the transaction, for the purpose of determining the exchange rate, is the date of initial recognition of the non- • If there are multiple payments or receipts in advance, a date of transaction is established for each payment or receipt. IFRIC 22 is effective for annual reporting periods beginning on or after January 1, 2018. Entities may apply the rule retrospectively, or prospectively, in accordance with IAS 8 with certain exemptions. PEMEX believes that these standards will not have an impact on its consolidated financial statements. Standards effective for periods beginning in 2019 a) IFRS 16, “Leases” (“IFRS 16”) In January 2016, the IASB published a new accounting standard IFRS 16, which replaces IAS 17, “Leases and Guide interpretations.” The main changes from the previous standard are: • IFRS 16 provides a comprehensive model for the identification of the lease arrangements and their treatment in the financial statements of both lessees and lessors; • the new standard applies a control model to the identification of leases, distinguishing between leases and service contracts on the basis of whether there is an identified asset controlled by the customer; • the distinction between financial and operating leasing is removed, therefore, the assets and liabilities are recognized in respect of all leases, with some exceptions for short-term leases and leases of low-value • the standard does not include significant changes to the requirements for accounting by lessors. The standard is effective for annual periods beginning on or after January 1, 2019, with earlier application permitted for entities that have also adopted IFRS 15, “Revenue from Contracts with Customers.” PEMEX has established a multidisciplinary working group with the objective to adapt its processes to the new standard in the following phases: (i) training, (ii) obtaining information, (iii) diagnostic, (iv) determination of initial adjustments and (v) integration of change. As of the date of these consolidated financial statements, the training phase for the accounting staff is complete and PEMEX is in the process of analyzing leasing contracts in order to determine necessary changes to its procedures and reports. PEMEX has not determined the impact of IFRS 16 on its net income (loss) for the year. PEMEX estimates that it will conclude the implementation of IFRS 16 in February 2019. b) Annual improvements—2015-2017 Cycle In December 2017, the IASB published “the Annual Improvements to the IFRS of the 2015-2017 Cycle” through which it clarifies the following IFRS: • IFRS 3 Business Combinations and IFRS 11 Joint Arrangements IFRS 3 Business Combinations clarifies how an entity should recognize an increase of its interest in a joint operation: • When a party to a joint arrangement obtains control of a business that was a part of that joint arrangement, and where that party had assumed a portion of the rights to the assets and obligations to the liabilities of that business prior to the acquisition date, the acquisition will be considered a business combination that is achieved in stages. The acquiriting entity must therefore apply the requirements for a business combination achieved in stages, including by measuring its previously held interest in the joint arrangement. • When a party participates in, but does not share in the control of a joint operation, and subsequently takes joint control of that joint operation, this will constitute the acquisition of a business and previously held interest in the joint operation are not measured. • IAS 12 Income Tax All income tax consequence of dividends (including payments on financial instruments classified as equity) are recognized consistently with the transactions that generated the distributable profits (i. e. in profit or loss, other comprehensive income or equity basis). • IAS 23 Borrowing Costs With respect to the treatment of costs for loans subject to capitalization, the amendments clarify that: • To the extent that an entity borrows funds generally and uses them for the purpose of obtaining a qualifying asset, that entity shall determine the amount of borrowing costs eligible for capitalization by applying a capitalization rate to the expenditures on that asset. The capitalization rate shall be the weighted average of the borrowing costs applicable to all borrowings of the entity that are outstanding during the period. • However, an entity shall exclude from this calculation borrowing cost applicable to borrowing made specifically for the purpose of obtaining a qualifying asset until substantially all the activities necessary to prepare that asset for its intended used or sale are complete. The amount of borrowing costs that an entity capitalizes during a period shall not exceed the amount of borrowing costs it incurred during that period. The amendments are effective for annual periods beginning on or after January 1, 2019. PEMEX is in the process of evaluating the impact that these amendments will have on its consolidated financial statements. c) IFRIC 23—Uncertainty over Income Tax Treatments In June 2017, the IASB published a new accounting interpretation to be applied to the determination of taxable profit (tax loss), tax bases, unused tax losses, unused tax credits and tax rates, where there is uncertainty over income tax treatments under IAS 12. In order to make these tax assessments, an entity must consider whether it is probable that the relevant taxing authority will accept each tax treatment, or group of tax treatments, that the entity has used or plans to use in its next income tax filing: • If the entity concludes that it is probable that a particular tax treatment will be accepted by the relevant taxing authority, that entity must determine taxable profit (tax loss), tax bases, unused tax losses, unused tax credits or tax rates consistently with the tax treatment included in its income tax filings. • If the entity concludes that it is not probable that a particular tax treatment is accepted by the relevant taxing authority, the entity must use the most likely amount or the expected value of the tax treatment when determining taxable profit (tax loss), tax bases, unused tax losses, unused tax credits and tax rates. That calculation should be based on which method provides better predictions of the resolution of the uncertainty. IFRIC 23 is effective for annual reporting periods beginning on or after January 1, 2019. Earlier application is permitted. PEMEX does not anticipate being impacted by IFRIC 23 because all tax positions are discussed and agreed with the SHCP prior to releasing quarterly or annual financial statements.

Significant Accounting Polici36

Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2017
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Disclosure of Consolidated Statements of Financial Position	Accordingly the balance as of these investments as of December 31, 2016 was reclassified for purposes of improving its presentation the consolidated statements of financial position as follows: 2016 Line item As previously (reported) Reclassification Following Available—for—sale financial assets Ps. 435,556 Ps. 2,417,123 Ps. 2,852,679 Total current assets 355,398,800 2,417,123 357,815,923 Investments in joint ventures and associates 23,154,632 (2,417,123 ) 20,737,509 Total non-current 1,974,487,224 (2,417,123 ) 1,972,070,101
Summary of Reclassification of Other Income (Expenses)	Due to the fact that reinsurance premiums from KOT Insurance Company, AG., from which PEMEX derives revenue, are not part of the core services provided by PEMEX, they are included in other income (expenses), net. Therefore, for comparison purposes, the consolidated statements of comprehensive income for the years ended December 31, 2016 and 2015 were reclassified as follow: 2016 Line item As previously (reported) Reclassification Following Services income Ps. 14,427,081 Ps. (5,452,439 ) Ps. 8,974,642 Total of sales 1,079,545,671 (5,452,439 ) 1,074,093,232 Cost of sales 867,580,634 (1,758,413 ) 865,822,221 Gross income (loss) 543,279,380 (3,694,026 ) 539,585,354 Other income (expenses), net 18,955,580 3,694,026 22,649,606 2015 Line item As previously (reported) Reclassification Following Services income Ps. 12,912,112 Ps. (4,602,077 ) Ps. 8,310,035 Total of sales 1,166,362,469 (4,602,077 ) 1,161,760,392 Cost of sales 895,068,904 (3,104,298 ) 891,964,606 Gross income (loss) (114,474,036 ) (1,497,779 ) (115,971,815 ) Other income (expenses), net (2,373,266 ) 1,497,779 (875,487 )
Summary of Better Presentation in Duties, Taxes and Other, Certain Amounts in Income Tax	In order to provide a better presentation in Duties, taxes and other, certain amounts in Income Tax line item, were reclassified to Hydrocarbon extraction duties and others line item, as follows: 2016 Line item As previously (reported) Reclassification Following Hydrocarbon extraction duties and others Ps. 304,813,375 Ps. (27,651,571 ) Ps. 277,161,804 Income tax (40,291,940 ) 27,651,571 (12,640,369 )

Segment financial information (

Segment financial information (Tables)	12 Months Ended
	Dec. 31, 2017
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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. 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. As of/for the year ended December 31, 2017 Exploration Production Industrial Cogeneration (1) Drilling and Logistics Fertilizers Ethylene Trading Corporate and Intersegment Total Sales: Trade Ps. — Ps. 857,456,146 Ps. — Ps. — Ps. — Ps. 4,123,006 Ps. 12,621,648 Ps. 508,539,112 Ps. 3,159,238 Ps. — Ps. 1,385,899,150 Intersegment 762,637,362 150,360,283 114,233 3,400,456 70,671,871 642,965 1,565,757 539,193,190 79,031,944 (1,607,618,061 ) — Services income — 6,116,937 334,755 41,741 3,714,941 2,339 26,733 66,621 826,502 — 11,130,569 (Reversal) impairment of wells pipelines, properties, plant and equipment, net 129,350,315 15,952,092 — — — 1,935,500 — — 4,206,653 — 151,444,560 Cost of sales 391,089,410 1,004,683,554 472,732 468,171 50,926,263 6,001,259 14,272,340 1,031,997,901 33,033,923 (1,528,740,673 ) 1,004,204,880 Gross income (loss) 242,197,637 (6,702,280 ) (23,744 ) 2,974,026 23,460,549 (3,168,449 ) (58,202 ) 15,801,022 45,777,108 (78,877,388 ) 241,380,279 Other revenues (expenses), net 10,204,045 1,515,538 2,646 (31,454 ) (24,134,436 ) 9,013 23,030 307,212 (5,344,872 ) 22,623,354 5,174,076 Distribution, transportation and sales expenses — 26,049,566 13,581 — 73,526 528,370 334,663 375,482 59,043 (5,544,561 ) 21,889,670 Administrative expenses 58,539,119 38,994,887 37,679 888,776 7,459,928 352,537 1,105,554 1,564,859 62,001,641 (51,005,526 ) 119,939,454 Operating income (loss) 193,862,563 (70,231,195 ) (72,358 ) 2,053,796 (8,207,341 ) (4,040,343 ) (1,475,389 ) 14,167,893 (21,628,448 ) 296,053 104,725,231 Financing income 121,293,404 11,427,907 147 57,313 1,622,827 2,248 46,113 905,405 145,907,795 (265,097,306 ) 16,165,853 Financing cost (136,378,338 ) (2,398,643 ) (19,882 ) (795,947 ) (2,307,427 ) (211,004 ) (1,964 ) (1,328,827 ) (239,003,771 ) 264,801,255 (117,644,548 ) Derivative financial instruments (cost) income, net (1,613,874 ) 5,835 — — — — — (772,143 ) 27,718,506 — 25,338,324 Foreign exchange (loss) income, net 10,043,316 4,924,209 — 227,365 613,099 (20,925 ) (10,486 ) (4,318 ) 7,411,862 — 23,184,122 Profit (loss) sharing in joint ventures and associates (75,195 ) 485,224 — — (74 ) — — 1,049,809 (212,666,494 ) 211,567,170 360,440 Taxes, duties and other 338,169,260 — — 276,967 (7,444,967 ) — — 1,972,718 6,063 — 332,980,041 Net (loss) income (151,037,384 ) (55,786,663 ) (92,093 ) 1,265,560 (833,949 ) (4,270,024 ) (1,441,726 ) 12,045,101 (292,266,613 ) 211,567,172 (280,850,619 ) Total current assets 1,036,063,541 570,380,888 179,807 6,871,148 49,391,784 3,155,476 3,994,381 158,414,445 506,187,594 (1,971,112,774 ) 363,526,290 Investments in joint ventures and associates 64,328 4 — — 18,336 — — 15,805,506 (465,026,224 ) 465,845,414 16,707,364 Wells, pipelines, properties, plant and equipment, net 945,945,889 286,423,735 — 18,956,882 119,647,553 5,713,998 19,008,822 6,739,231 34,073,216 — 1,436,509,326 Total assets 2,058,036,405 857,196,306 179,807 26,220,748 191,895,993 8,923,456 23,142,045 186,808,899 2,111,740,735 (3,332,142,280 ) 2,132,002,114 Total current liabilities 284,656,058 459,130,165 531,580 2,201,936 44,521,371 6,455,246 2,183,654 112,046,527 1,439,097,882 (1,961,697,234 ) 389,127,185 Long-term debt 1,826,843,268 25,437,147 — 11,258,734 2,814,640 — — 2,712,654 1,837,690,559 (1,826,091,398 ) 1,880,665,604 Employee benefits 372,032,958 588,573,518 — 333,212 1,842,892 98,361 105,033 (966,238 ) 296,416,386 — 1,258,436,122 Total liabilities 2,570,412,398 1,077,108,748 531,580 13,886,424 56,706,251 6,556,050 2,308,890 116,842,881 3,587,988,972 (3,797,987,695 ) 3,634,354,499 Equity (deficit), net (512,375,993 ) (219,912,442 ) (351,773 ) 12,334,324 135,189,742 2,367,406 20,833,155 69,966,018 (1,476,248,237 ) 465,845,415 (1,502,352,385 ) Depreciation and amortization 127,742,568 17,935,112 — 2,368,123 4,562,140 422,930 1,688,493 (19,798 ) 2,004,945 — 156,704,513 Net periodic cost of employee benefits 32,794,386 52,538,989 — 39,697 (4,954 ) (1,999 ) (12,561 ) 16,166 22,703,351 — 108,073,075 Acquisition of wells, pipelines, properties, plant and equipment 67,845,989 14,678,182 — 418,283 5,189,409 219,152 475,196 321,145 4,832,461 — 93,979,817 (1) Certain of the assets of Pemex Cogeneration and Services have been transferred to Pemex Industrial Transformation. As of/for the year ended December 31, 2016 Exploration Production Industrial Cogeneration Drilling and Logistics Fertilizers Ethylene Trading Corporate and Intersegment Total Sales: Trade Ps. — Ps. 648,088,013 Ps. — Ps. — Ps. — Ps. 3,873,403 Ps. 15,392,552 Ps. 395,118,117 Ps. 2,646,505 Ps. — Ps. 1,065,118,590 Intersegment 616,380,615 117,096,378 51,913 1,981,754 68,316,958 900,464 1,764,438 405,293,283 50,683,175 (1,262,468,978 ) — Services income — 5,565,604 132,521 70,112 2,813,887 1,908 60,141 236,230 473,415 (379,176 ) 8,974,642 (Reversal) impairment of wells pipelines, properties, plant and equipment, net (271,709,433 ) (52,498,881 ) — — (5,829,520 ) — (1,276,509 ) — — — (331,314,343 ) Cost of sales 359,064,884 823,763,927 166,721 143,956 61,248,584 5,506,198 13,936,213 783,691,245 7,260,043 (1,188,959,550 ) 865,822,221 Gross income (loss) 529,025,164 (515,051 ) 17,713 1,907,910 15,711,781 (730,423 ) 4,557,427 16,956,385 46,543,052 (73,888,604 ) 539,585,354 Other revenues (expenses), net 27,346,794 19,964,654 — 591,704 (27,189,969 ) 32,710 63,989 3,412,711 (906,183 ) (666,804 ) 22,649,606 Distribution, transportation and sales expenses — 50,792,317 8,232 6 148,215 185,168 481,727 229,432 49,162 (26,663,019 ) 25,231,240 Administrative expenses 54,509,047 34,183,846 32,126 983,560 7,175,451 731,479 2,101,834 1,157,182 60,497,232 (48,718,224 ) 112,653,533 Operating income (loss) 501,862,911 (65,526,560 ) (22,645 ) 1,516,048 (18,801,854 ) (1,614,360 ) 2,037,855 18,982,482 (14,909,525 ) 825,835 424,350,187 Financing income 56,040,129 11,056,345 — 72,995 373,301 4,358 64,582 1,098,079 125,964,466 (180,925,000 ) 13,749,255 Financing cost (109,946,363 ) (3,188,892 ) (12,055 ) (642,711 ) (481,741 ) (20,217 ) (2,980 ) (1,342,351 ) (163,400,779 ) 180,193,625 (98,844,464 ) Derivative financial instruments (cost) income, net — 3,172 — — — — — (1,951,959 ) (12,052,200 ) — (14,000,987 ) Foreign exchange (loss) income, net (217,166,718 ) (12,858,875 ) — (1,570,317 ) (1,118,537 ) (29,263 ) (2,843 ) 174,866 (21,441,056 ) — (254,012,743 ) Profit (loss) sharing in joint ventures and associates (21,164 ) 649,520 — — — — — 1,586,503 (117,426,818 ) 117,347,804 2,135,845 Taxes, duties and other 276,647,448 — — (481,581 ) (10,010,686 ) — — 7,380,870 (9,014,616 ) — 264,521,435 Net (loss) income (45,878,653 ) (69,865,290 ) (34,700 ) (142,404 ) (10,018,145 ) (1,659,482 ) 2,096,614 11,166,750 (194,251,296 ) 117,442,264 (191,144,342 ) Total current assets 983,260,710 795,237,287 388,422 6,032,213 22,087,801 1,724,967 5,817,262 125,081,531 613,881,578 (2,195,695,848 ) 357,815,923 Investments in joint ventures and associates 139,523 257,159 — — — — — 17,568,893 (247,349,711 ) 250,121,645 20,737,509 Wells, pipelines, properties, plant and equipment, net 1,176,504,263 311,432,174 — 21,023,629 86,695,514 7,771,634 20,086,650 6,691,813 37,536,571 — 1,667,742,248 Total assets 2,206,418,541 1,107,094,580 388,423 27,673,598 130,824,921 9,556,469 26,007,319 155,376,864 2,359,024,145 (3,692,478,836 ) 2,329,886,024 Total current liabilities 340,011,451 666,467,674 472,236 3,894,121 19,824,792 2,995,088 3,879,828 78,894,485 1,497,612,971 (2,187,862,760 ) 426,189,886 Long-term debt 1,737,109,328 31,495,027 — 12,489,423 4,382,109 — — 3,597,938 1,757,315,685 (1,739,384,968 ) 1,807,004,542 Employee benefits 362,312,386 575,277,374 191,876 441,127 571,702 20,362 21,893 (749,034 ) 282,321,750 — 1,220,409,436 Total liabilities 2,533,221,665 1,278,138,290 664,829 16,853,202 29,336,417 3,015,450 3,901,722 86,885,889 3,553,477,189 (3,942,600,482 ) 3,562,894,171 Equity (deficit), net (326,803,124 ) (171,043,710 ) (276,406 ) 10,820,396 101,488,504 6,541,019 22,105,597 68,490,975 (1,194,453,044 ) 250,121,646 (1,233,008,147 ) Depreciation and amortization 124,329,921 17,425,472 — 2,559,357 2,230,557 481,241 1,395,232 86,707 1,931,004 — 150,439,491 Net periodic cost of employee benefits 32,617,215 52,886,397 5,860 31,491 30,340 (1,178 ) 1,424 (552,735 ) 24,719,602 — 109,738,416 Acquisition of wells, pipelines, properties, plant and equipment 70,418,370 32,254,531 — 2,053,139 26,344,495 889,420 1,724,690 1,019,484 21,031,214 — 155,735,343 As of/for the year ended December 31, 2015 Exploration Production Industrial Cogeneration Drilling and Logistics Fertilizers Ethylene Trading Corporate and Intersegment Total Sales: Trade Ps. — Ps. 740,190,020 Ps. — Ps. — Ps. — Ps. 1,494,478 Ps. 4,551,413 Ps. 407,214,446 Ps. — Ps. — Ps. 1,153,450,357 Intersegment 690,642,133 126,294,195 — 1,511,970 598,853 209,970 473,990 353,137,149 18,296,515 (1,191,164,775 ) — Services income — 7,549,061 — — 10,355,988 236 17,893 661,683 505,032 (10,779,858 ) 8,310,035 Impairment of wells, pipelines, properties, plant and equipment 394,396,580 76,442,079 — — 5,829,519 — 1,276,512 — — — 477,944,690 Benefit from change in pension plan (46,368,308 ) (45,808,781 ) — — — — — — — — (92,177,089 ) Cost of sales 427,158,621 876,531,944 2,793 706,896 10,727,462 1,707,548 4,965,414 749,655,199 2,791,350 (1,182,282,621 ) 891,964,606 Gross income (loss) (84,544,760 ) (33,131,966 ) (2,793 ) 805,074 (5,602,140 ) (2,864 ) (1,198,630 ) 11,358,079 16,010,197 (19,662,012 ) (115,971,815 ) Other revenues (expenses), net (7,957,202 ) 1,243,040 — 38 26,941 14,680 19,909 1,666,783 2,219,539 1,890,785 (875,487 ) Distribution, transportation and sales expenses — 35,292,527 1,448 — 3,009 4,416 62,071 428,613 254 (6,863,699 ) 28,928,639 Administrative expenses 18,454,281 40,529,587 47,670 8,553 104,794 152,404 519,351 1,967,581 61,609,813 (10,921,939 ) 112,472,095 Benefit from change in pension plan (17,853,725 ) (39,975,450 ) — — — — — — (46,031,780 ) — (103,860,955 ) Operating income (loss) (93,102,518 ) (67,735,590 ) (51,911 ) 796,559 (5,683,002 ) (145,004 ) (1,760,143 ) 10,628,668 2,651,449 14,411 (154,387,081 ) Financing income 25,852,078 2,789,535 — 43,690 37 3,503 7,728 1,147,870 110,816,691 (125,670,273 ) 14,990,859 Financing cost (90,822,360 ) (13,738,104 ) 2,110 (95,280 ) (61,153 ) — — (1,299,580 ) (87,289,616 ) 125,530,390 (67,773,593 ) Derivative financial instruments (cost) income, net — 6,463 — — — — — 1,347,323 (22,803,663 ) — (21,449,877 ) Foreign exchange (loss), net (132,165,427 ) (7,364,486 ) (7,509 ) (92,046 ) (11,090 ) (3,600 ) (2,802 ) (49,190 ) (15,069,424 ) — (154,765,574 ) (Loss) profit sharing in joint ventures and associates (473,082 ) 671,868 — — — — — 2,056,259 (749,900,890 ) 749,963,960 2,318,115 Taxes, duties and other 376,682,705 1,839,021 — 197,491 (2,069,848 ) — — 5,134,176 (50,283,298 ) — 331,500,247 Net (loss) income (667,394,014 ) (87,209,335 ) (57,310 ) 455,432 (3,685,360 ) (145,101 ) (1,755,217 ) 8,697,174 (711,312,155 ) 749,838,488 (712,567,398 ) Total current assets 709,252,019 313,801,630 655,239 2,171,717 49,162,929 1,594,643 4,988,511 73,116,155 275,582,816 (1,163,125,162 ) 267,200,497 Investments in joint ventures and associates 919,654 6,687,977 — — — 8,500 — 11,845,489 (242,233,405 ) 246,937,384 24,165,599 Wells, pipelines, properties, plant and equipment, net 966,144,619 246,463,069 — 22,647,454 58,078,603 7,405,969 18,480,684 3,045,704 22,217,529 — 1,344,483,631 Total assets 1,698,909,240 567,486,579 655,240 24,917,981 111,307,038 9,034,376 23,705,118 93,266,620 1,443,189,885 (2,196,817,877 ) 1,775,654,200 Total current liabilities 278,507,394 104,569,842 469,524 1,981,652 14,698,159 1,486,468 4,534,980 34,749,438 1,157,183,570 (1,154,773,306 ) 443,407,721 Long-term debt 1,252,239,594 16,707,005 — 12,031,849 4,850,905 — — 3,607,840 1,285,676,066 (1,274,240,092 ) 1,300,873,167 Employee benefits 379,150,943 609,492,623 61,171 417,817 368,036 12,533 3,611 (59,581 ) 289,938,288 — 1,279,385,441 Total liabilities 1,985,557,185 735,280,560 530,696 14,431,318 19,917,100 1,499,001 4,538,591 41,420,792 2,747,910,113 (2,443,755,258 ) 3,107,330,098 Equity (deficit), net (286,647,945 ) (167,793,981 ) 124,544 10,486,663 91,389,938 7,535,375 19,166,527 51,845,828 (1,304,720,228 ) 246,937,381 (1,331,675,898 ) Depreciation and amortization 144,567,149 20,916,796 — 612,741 337,364 158,505 442,504 84,493 831,698 — 167,951,250 Net periodic cost of employee benefits 23,608,485 21,392,600 (298 ) — (310 ) — — (119,819 ) 17,668,484 — 62,549,142 Acquisition of wells, pipelines, properties, plant and equipment 184,786,051 68,935,841 — — 1,544,224 320,762 1,882,108 677,314 6,711,511 — 264,857,811
Schedule of Accounting Reconciliations Between Individual and Consolidated Information	The following tables present accounting reconciliations between individual and consolidated information. As of/for the year ended December 31, 2017 Exploration and Industrial Cogeneration Drilling Logistics Fertilizers Ethylene Trading Corporate Sales: By segment Ps. 762,637,362 1,015,157,118 448,988 6,679,132 74,386,812 4,795,196 14,214,138 1,047,874,453 83,017,684 Less unrealized intersegment sales — (1,223,752 ) — (3,236,935 ) — (26,886 ) — (75,530 ) — Total consolidated sales Ps. 762,637,362 1,013,933,366 448,988 3,442,197 74,386,812 4,768,310 14,214,138 1,047,798,923 83,017,684 Operating income (loss): By segment Ps. 194,814,292 (59,989,652 ) (72,358 ) 882,692 (61,696,313 ) (7,148,431 ) (4,698,838 ) 14,490,017 (21,628,448 ) Less unrealized intersegment sales — (1,223,752 ) — (3,236,935 ) — (26,886 ) — (75,530 ) — Less unrealized gain due to production cost valuation of inventory (496,329 ) (9,017,791 ) — 2,932,663 — — — (246,594 ) — Less capitalized refined products (574,381 ) — — — — — — — — Less amortization of capitalized interest 118,981 — — — — — — — — Less depreciation and impairment of revaluated transferred assets — — — 1,475,376 53,488,972 3,134,974 3,223,449 — — Total consolidated operating income (loss) Ps. 193,862,563 (70,231,195 ) (72,358 ) 2,053,796 (8,207,341 ) (4,040,343 ) (1,475,389 ) 14,167,893 (21,628,448 ) Net income (loss): By segment Ps. (150,388,699 ) (44,599,751 ) (358,862 ) 345,913 (40,300,942 ) (8,616,130 ) (5,866,542 ) 5,200,268 (292,266,613 ) Less unrealized intersegment sales — (1,223,752 ) — (3,236,935 ) — (26,886 ) — (75,530 ) — Less unrealized gain due to production cost valuation of inventory (496,329 ) (9,017,791 ) — 2,932,663 — — — (246,594 ) — Less capitalized refined products (574,381 ) — — — — — — — — Less equity method elimination 303,044 (945,369 ) 266,769 — 333 1,238,018 1,201,367 7,166,957 — Less amortization of capitalized interest 118,981 — — — — — — — — Less depreciation and impairment of revaluated transferred assets, net of deferred taxes — — — 1,223,919 39,466,660 3,134,974 3,223,449 — — Total consolidated net (loss) income Ps. (151,037,384 ) (55,786,663 ) (92,093 ) 1,265,560 (833,949 ) (4,270,024 ) (1,441,726 ) 12,045,101 (292,266,613 ) Assets: By segment Ps. 2,084,553,745 912,770,881 179,807 28,256,876 276,537,764 17,689,305 35,498,783 195,538,239 2,111,740,735 Less unrealized intersegment sales 858,094 (5,389,977 ) — — 7,183 — (5,303 ) (408,059 ) — Less unrealized gain due to production cost valuation of inventory (3,657,242 ) (42,379,229 ) — — — (26,886 ) — (7,163,664 ) — Less capitalized refined products (574,381 ) — — — — — — — — Less depreciation and impairment of revaluated transferred assets, net of deferred taxes (22,503,168 ) — — (2,036,128 ) (84,557,831 ) (2,165,068 ) (9,522,686 ) (424,849 ) — Less equity method for unrealized profits (759,624 ) (7,813,492 ) — — (91,123 ) (6,573,895 ) (2,828,749 ) (732,768 ) — Less amortization of capitalized interest 118,981 8,123 — — — — — — — Total consolidated assets Ps. 2,058,036,405 857,196,306 179,807 26,220,748 191,895,993 8,923,456 23,142,045 186,808,899 2,111,740,735 Liabilities: By segment Ps. 2,570,412,398 1,081,528,677 531,580 13,186,297 56,706,251 6,556,050 2,308,890 116,648,398 3,587,988,972 Less unrealized intersegment sales — (4,419,929 ) — 700,127 — — — 194,483 — Total consolidated liabilities Ps. 2,570,412,398 1,077,108,748 531,580 13,886,424 56,706,251 6,556,050 2,308,890 116,842,881 3,587,988,972 As of/for the year ended Exploration and Industrial Cogeneration and Drilling and Logistics Fertilizers Ethylene Trading Corporate and Sales: By segment Ps. 616,380,615 771,597,427 184,434 6,263,093 71,130,845 4,775,775 17,217,131 800,979,076 53,803,095 Less unrealized intersegment sales — (847,432 ) — (4,211,227 ) — — — (331,446 ) — Total consolidated sales Ps. 616,380,615 770,749,995 184,434 2,051,866 71,130,845 4,775,775 17,217,131 800,647,630 53,803,095 Operating income (loss): By segment Ps. 503,679,153 (60,347,367 ) (22,645 ) 1,271,202 (25,701,065 ) (2,877,725 ) (3,504,812 ) 19,526,997 (14,909,525 ) Less unrealized intersegment sales — (847,432 ) — (4,211,227 ) — — — (331,446 ) — Less unrealized gain due to production cost valuation of inventory (273,237 ) 3,572,498 — 3,815,371 — 905,910 (2,163 ) (213,069 ) — Less capitalized refined products (1,661,986 ) (7,904,259 ) — — — — — — — Less amortization of capitalized interest 118,981 — — — — — — — — Less depreciation and impairment of revaluated assets — — — 640,702 6,899,211 357,455 5,544,830 — — Total consolidated operating income (loss) Ps. 501,862,911 (65,526,560 ) (22,645 ) 1,516,048 (18,801,854 ) (1,614,360 ) 2,037,855 18,982,482 (14,909,525 ) Net income (loss): By segment Ps. (44,069,001 ) (61,639,067 ) (381,214 ) (387,250 ) (16,917,356 ) (7,820,835 ) (3,780,706 ) 11,711,265 (194,251,296 ) Less unrealized intersegment sales — (847,432 ) — (4,211,227 ) — — — (331,446 ) — Less unrealized gain due to production cost valuation of inventory (273,237 ) 3,572,498 — 3,815,371 — 905,910 (2,163 ) (213,069 ) — Less capitalized refined products (1,661,986 ) (7,904,259 ) — — — — — — — Less equity method elimination 6,590 (3,047,030 ) 346,514 — — 4,897,988 334,653 — — Less amortization of capitalized interest 118,981 — — — — — — — — Less depreciation of revaluated assets — — — 640,702 6,899,211 357,455 5,544,830 — — Total consolidated net (loss) income Ps. (45,878,653) (69,865,290 ) (34,700 ) (142,404 ) (10,018,145 ) (1,659,482 ) 2,096,614 11,166,750 (194,251,296 ) Assets: By segment Ps.2,232,052,453 1,151,907,566 425,141 30,990,147 254,615,026 10,421,225 43,067,636 170,782,928 2,359,024,145 Less unrealized intersegment sales 483,230 (4,158,101 ) — — — — (5,304 ) (332,529 ) — Less unrealized gain due to production cost valuation of inventory (3,246,782 ) (33,361,438 ) — — — — — (5,688,341 ) — Less capitalized refined products (1,661,986 ) — — — — — — — — Less depreciation of revalued assets (20,585,300 ) — — (3,316,549 ) (123,790,105 ) (5,300,044 ) (12,746,136 ) (652 ) — Less equity method for unrealized profits (742,055 ) (7,293,447 ) (36,718 ) — — 4,435,288 (4,308,877 ) (8,960,344 ) — Less amortization of capitalized interest 118,981 — — — — — — (424,198 ) — Total consolidated assets Ps.2,206,418,541 1,107,094,580 388,423 27,673,598 130,824,921 9,556,469 26,007,319 155,376,864 2,359,024,145 Liabilities: By segment Ps.2,533,221,665 1,282,558,220 664,829 16,457,347 29,336,417 3,015,450 3,901,722 85,392,123 3,553,477,189 Less unrealized intersegment sales — (4,419,930 ) — 395,855 — — — 1,493,766 — Total consolidated liabilities Ps.2,533,221,665 1,278,138,290 664,829 16,853,202 29,336,417 3,015,450 3,901,722 86,885,889 3,553,477,189 As of/for the year ended December 31, 2015 Exploration and Industrial Cogeneration and Drilling and Logistics Fertilizers Ethylene Trading Corporate and Sales: By segment Ps. 690,642,133 874,630,488 — 1,511,970 10,954,841 1,704,684 5,048,600 761,213,475 18,801,547 Less unrealized intersegment sales — (597,212 ) — — — — (5,304 ) (200,197 ) — Total consolidated sales Ps. 690,642,133 874,033,276 — 1,511,970 10,954,841 1,704,684 5,043,296 761,013,278 18,801,547 Operating income (loss): By segment Ps. (89,473,302 ) (88,819,558 ) (51,911 ) 700,748 (6,875,252 ) (262,145 ) (2,288,747 ) 10,334,138 2,651,449 Less unrealized intersegment sales — (597,212 ) — — — — (5,304 ) (200,197 ) — Less unrealized gain due to production cost valuation of inventory (251,995 ) 21,681,180 — — — — 2,163 494,727 — Less capitalized refined products (3,496,201 ) — — — — — — — — Less amortization of capitalized interest 118,980 — — — — — — — — Less depreciation and impairment of revaluated assets — — — 95,811 1,192,250 117,141 531,745 — — Total consolidated operating (loss) income Ps. (93,102,518 ) (67,735,590 ) (51,911 ) 796,559 (5,683,002 ) (145,004 ) (1,760,143 ) 10,628,668 2,651,449 Net income (loss): By segment Ps. (663,719,119 ) (107,164,261 ) (57,310 ) 359,621 (4,877,610 ) (262,242 ) (2,314,774 ) 8,402,644 (711,312,155 ) Less unrealized intersegment sales — (597,212 ) — — — — (5,304 ) (200,197 ) — Less unrealized gain due to production cost valuation of inventory (251,995 ) 21,681,180 — — — — 2,163 494,727 — Less capitalized refined products (3,496,201 ) — — — — — — — Less equity method elimination (45,679 ) (1,129,042 ) — — — — 30,953 — — Less amortization of capitalized interest 118,980 — — — — — — — — Less depreciation of revaluated assets — — — 95,811 1,192,250 117,141 531,745 — — Total consolidated net (loss) income Ps. (667,394,014 ) (87,209,335 ) (57,310 ) 455,432 (3,685,360 ) (145,101 ) (1,755,217 ) 8,697,174 (711,312,155 )
Supplemental Geographic Information	Supplemental geographic information: For the years ended December 31, 2017 2016 2015 Domestic sales Ps. 877,360,038 Ps. 670,000,473 Ps. 746,235,912 Export sales: United States 302,912,999 221,954,461 266,826,499 Canada, Central and South America 13,943,080 14,058,897 11,027,813 Europe 71,470,613 64,348,997 58,707,787 Other 120,212,420 94,755,762 70,652,346 Total export sales 508,539,112 395,118,117 407,214,445 Services income 11,130,569 8,974,642 8,310,035 Total sales Ps. 1,397,029,719 Ps. 1,074,093,232 Ps. 1,161,760,392
Schedule of Income By Product	The following table shows income by product: For the years ended December 31, 2017 2016 2015 Domestic sales Refined petroleum products and derivatives (primarily gasolines) Ps. 784,048,048 Ps. 578,718,674 Ps. 660,573,780 Gas 70,930,855 59,648,576 54,497,824 Petrochemical products 22,381,135 31,633,223 31,164,308 Total domestic sales Ps. 877,360,038 Ps. 670,000,473 Ps. 746,235,912 Export sales Crude oil Ps. 380,461,147 Ps. 288,625,794 Ps. 288,170,451 Refined petroleum products and derivatives (primarily gasolines) 109,615,457 92,705,248 118,129,615 Gas 21,675 20,995 27,283 Petrochemical products 18,440,833 13,766,080 887,096 Total export sales Ps. 508,539,112 Ps. 395,118,117 Ps. 407,214,445

Cash, Cash Equivalents and Re38

Cash, Cash Equivalents and Restricted Cash (Tables)	12 Months Ended
	Dec. 31, 2017
Text block1 [abstract]
Summary of Cash and Cash Equivalents	a. As of December 31, 2017 and 2016, cash and cash equivalents were as follows: 2017 2016 Cash on hand and in banks (i) Ps. 55,871,127 Ps. 71,430,427 Highly liquid investments (ii) 41,980,627 92,102,086 Ps. 97,851,754 Ps. 163,532,513 (i) Cash on hand and in banks is primarily composed of cash in banks. (ii) Mainly composed of short-term Mexican Government investments. b. At December 31, 2017 and 2016, restricted cash was as follows: 2017 2016 Restricted cash Ps. — Ps. 10,478,626

Accounts Receivable, Net (Table

Accounts Receivable, Net (Tables)	12 Months Ended
	Dec. 31, 2017
Text block1 [abstract]
Summary of Accounts Receivable and Other Receivables	As of December 31, 2017 and 2016, accounts receivable and other receivables were as follows: 2017 2016 Domestic customers, net Ps. 60,057,141 Ps. 41,884,579 Export customers, net 54,428,883 34,859,341 Sundry debtors 26,105,703 18,736,922 Taxes to be recovered and prepaid taxes 23,039,023 29,361,303 Employees and officers 5,681,478 6,054,251 Advances to suppliers 1,250,846 2,246,437 Other accounts receivable 82,160 77,694 Ps. 170,645,234 Ps. 133,220,527
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, 2017 and 2016: Domestic customers 2017 2016 1 to 30 days Ps. 10,188,070 Ps.1,767,718 31 to 60 days 4,081,862 658,456 61 to 90 days 777,409 263,447 More than 90 days (i) 11,345,933 1,016,553 Past due 26,393,274 3,706,174 Impaired (reserved) (951,932 ) (458,428 ) Unimpaired 25,441,342 3,247,746 Current 34,615,799 38,636,833 Total Ps. 60,057,141 Ps.41,884,579 (i) The increase in 2017 in accounts receivable invoices more than 90 days old is primarily due to the termination of the outstanding balances compensation system in place between Mexican Government owned companies. Export customers 2017 2016 1 to 30 days Ps. 334,155 Ps. 341,184 31 to 60 days — 6,824 61 to 90 days — 35,372 More than 90 days 315,888 624,157 Past due 650,043 1,007,537 Impaired (reserved) (272,813 ) (374,699 ) Unimpaired 377,230 632,838 Current 54,051,653 34,226,503 Total Ps. 54,428,883 Ps. 34,859,341
Summary of Reconciliation for Impaired Accounts Receivable	Additionally, the reconciliation for impaired accounts receivable is as follows: Domestic customers 2017 2016 Balance at the beginning of the year Ps. (458,428 ) Ps. (667,883 ) Additions against income (493,514 ) (218,836 ) Amount used 10 428,291 Balance at the end of the year Ps. (951,932 ) Ps. (458,428 ) Export customers 2017 2016 Balance at the beginning of the year Ps. (374,699 ) Ps. (312,004 ) Additions against income (204,713 ) (25,931 ) Amount used 297,047 — Translation effects 9,552 (36,764 ) Balance at the end of the year Ps. (272,813) Ps. (374,699)

Inventories, Net (Tables)

Inventories, Net (Tables)	12 Months Ended
	Dec. 31, 2017
Text block1 [abstract]
Summary of Inventories	As of December 31, 2017 and 2016, inventories were as follows: 2017 2016 Refined and petrochemicals products Ps. 27,862,384 Ps. 21,534,846 Products in transit 19,112,606 7,735,163 Crude oil 11,445,780 11,391,310 Materials and products in stock 5,172,779 4,721,834 Materials in transit 180,711 419,547 Gas and condensate products 84,670 89,360 Ps. 63,858,930 Ps. 45,892,060

Investments in Joint Ventures41

Investments in Joint Ventures and Associates (Tables)	12 Months Ended
	Dec. 31, 2017
Investments Schedule [Abstract]
Schedule of Permanent Investments in joint Ventures and Associates	The investments in joint ventures and associates as of December 31, 2017 and 2016, were as follows: Percentage of December 31, 2017 2016 Deer Park Refining Limited 49.99% Ps.14,405,542 Ps.14,039,384 Petroquímica Mexicana de Vinilo, S. A. de C. V. (i) 44.09% — 4,309,050 Sierrita Gas Pipeline LLC 35.00% 1,084,169 1,112,338 Frontera Brownsville, LLC. 50.00% 471,085 478,414 CH4 Energía, S. A. 50.00% 315,713 194,868 Texas Frontera, LLC. 50.00% 239,782 260,828 Administración Portuaria Integral de Dos Bocas, S.A. de C.V. 40.00% 64,328 139,523 PMV Minera, S.A. de C.V. 44.09% 45,133 61,779 Ductos el peninsular, S.A.P.I de C. V. 50.00% 18,336 18,626 Other-net Various 63,276 122,699 Ps.16,707,364 Ps.20,737,509 i. On April 20, 2016, an explosion occurred in the “Planta de Clorados 3” (Chlorinated Plant 3) of the Petroquímica Mexicana de Vinilo, resulting in approximately U.S. $ 461,000 in damages. Chorinated Plant 3 incurred the greatest amount of damage, including the loss of certain assets and the closure of the plant for an undefined amount of time. The Chlorine-Soda plants and the ethylene plants did not register any damage. On December 20, 2017, Petroquímica Mexicana de Vinilo permanently closed the plant, and -the written-off
Schedule Profit Sharing in Joint Ventures and Associates	Profit (loss) sharing in joint ventures and associates: 2017 2016 2015 Deer Park Refining Limited Ps. 920,409 Ps. 1,437,850 Ps. 1,913,835 Ductos y Energéticos del Norte, S.A. de C.V. (i) 360,092 — — CH4 Energía S.A. de C.V. 125,132 — — Sierrita Gas Pipeline LLC 129,401 105,825 152,445 PMV Minera, S.A. de C.V. 6,253 — — Petroquímica Mexicana de Vinilo, S. A. de C. V. (1,223,640 ) (190,468 ) (61,952 ) Administración Portuaria Integral de Dos Bocas, S.A. de C.V. (75,195 ) — — Gasoductos de Chihuahua, S. de R. L. de C. V. (ii) — 638,126 666,779 Compañía Mexicana de Exploraciones, S. A. de C. V. (iii) — — (496,774 ) Other, net 117,988 144,512 143,782 Profit sharing in joint ventures and associates, net Ps. 360,440 Ps. 2,135,845 Ps. 2,318,115 i. In November 2017, PEMEX sold its 50% interest in Ductos y Energéticos del Norte, S. de R.L. de C. V., to Infraestructura Energética Nova, S.A.B. of C.V. for a total of U.S. $ 3,141,710, yielding a profit of Ps. 3,139,103. ii. On September 28, 2016, PEMEX completed the divestiture of its 50% ownership interest in the Gasoductos de Chihuahua S. de R.L. de C.V. joint venture with Infraestructura Energética Nova, S.A.B. de C.V. The stock was sold for Ps. 22,684,736, yielding a profit of Ps. 15,211,039. iii. Beginning July 1, 2016 this company was included in the consolidated financial statements of PEMEX. Until June 30, 2016 this Company was accounted for as an investment in an associate under the equity method (see Note 3-a).
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 during 2017 and 2016: Condensed statements of financial position Deer Park Refining Limited Sierrita Gas Pipeline, LLC 2017 2016 2017 2016 Total assets Ps. 41,075,547 Ps. 42,428,275 Ps.3,518,036 Ps.3,244,811 Total liabilities Ps. 12,261,581 Ps. 14,346,643 Ps. 420,410 Ps. 66,703 Total equity 28,813,966 28,081,632 3,097,626 3,178,108 Total liabilities and equity Ps.41,075,547 Ps. 42,428,275 Ps.3,518,036 Ps.3,244,811 Condensed statements of comprehensive income Deer Park Refining Limited Sierrita Gas Pipeline, Gasoductos de Chihuahua, December 31, December 31, August 31, December 31, 2017 2016 2015 2017 2016 2016 2015 Sales and other income Ps.16,427,064 Ps.16,750,155 Ps.16,658,705 Ps. 840,414 Ps. 717,351 Ps.3,798,666 Ps.4,617,982 Costs and expenses 14,586,061 13,874,172 12,830,653 470,697 414,994 2,522,415 3,284,424 Net result Ps. 1,841,003 Ps. 2,875,983 Ps. 3,828,052 Ps. 369,717 Ps. 302,357 Ps.1,276,251 Ps.1,333,558

Wells, Pipelines, Properties,42

Wells, Pipelines, Properties, Plant and Equipment, Net (Tables)	12 Months Ended
	Dec. 31, 2017
Detailed Information About Property, Plant and Equipment	Plants Drilling Pipelines Wells Buildings Offshore Furniture and Transportation Construction Land Unproductive Other fixed Total Investment Balances as of January 1, 2016 Ps. 648,412,014 21,680,343 419,979,508 1,066,515,651 66,284,466 260,328,096 52,966,194 15,329,095 211,675,597 43,347,802 — 630,878 2,807,149,644 Acquisitions 20,406,464 1,629,710 1,265,011 8,239,480 2,541,802 9,866,984 545,271 2,063,519 107,682,868 1,487,434 6,800 — 155,735,343 Reclassifications 150,817 — (1,268,887 ) 8,649,686 (6,610,184 ) — (561,569 ) (325,778 ) (282,044 ) 50,709 2,039 (137,246 ) (332,457 ) Capitalization 15,943,630 — 11,851,378 40,825,973 1,085,323 17,318,279 2,769 2,918,621 (89,945,973 ) — — — — Impairment 81,135,967 — 31,967,407 198,974,994 — 35,640,491 438,979 8,743 (16,852,238 ) — — — 331,314,343 Disposals (7,602,782 ) (40,937 ) (3,648,989 ) (4,382,867 ) (558,374 ) (449,645 ) (2,644,957 ) (551,355 ) (4,864,062 ) (314,327 ) (8,839 ) (2,126 ) (25,069,260 ) Balances as of December 31, 2016 758,446,110 23,269,116 460,145,428 1,318,822,917 62,743,033 322,704,205 50,746,687 19,442,845 207,414,148 44,571,618 — 491,506 3,268,797,613 Acquisitions 10,018,030 418,283 7,054,793 14,937,882 802,300 7,811,374 1,183,679 284,445 51,410,469 58,563 — — 93,979,818 Reclassifications 3,146,955 — (53,349 ) — 98,245 (10,199,213 ) (96,899 ) (75,674 ) (812,943 ) (560 ) — 4,072,464 (3,920,974 ) Capitalization 43,033,864 — 21,357,074 36,564,811 1,265,246 8,677,765 30,879 3,746,395 (114,700,828 ) 29,248 — (4,454 ) — Impairment (48,020,616 ) — 2,226,771 (83,236,991 ) — (15,564,190 ) — — (6,849,534 ) — — — (151,444,560 ) Disposals (10,598,983 ) (244,283 ) (8,862,541 ) (19,340,709 ) (208,353 ) — (806,694 ) (226,375 ) (6,724,930 ) (112,170 ) — (4,440,865 ) (51,565,902 ) Balances as of December 31, 2017 Ps. 756,025,360 23,443,116 481,868,176 1,267,747,910 64,700,471 313,429,941 51,057,652 23,171,636 129,736,382 44,546,699 — 118,651 3,155,845,995 Accumulated depreciation and amortization Balances as of January 1, 2016 Ps.(321,283,906 ) (578,015 ) (139,331,407 ) (780,443,639 ) (37,712,087 ) (140,908,960 ) (36,513,479 ) (5,894,520 ) — — — — (1,462,666,013 ) Depreciation and amortization (44,549,443 ) (2,364,560 ) (15,153,879 ) (70,090,038 ) (1,796,383 ) (12,252,810 ) (3,205,089 ) (1,027,289 ) — — — — (150,439,491 ) Reclassifications (10,521 ) — (166,632 ) (3,077 ) (108,718 ) — 166,914 454,492 — — — — 332,458 Disposals 5,826,891 — 2,286,691 — 492,557 — 2,560,988 550,554 — — — — 11,717,681 Balances as of December 31, 2016 (360,016,979 ) (2,942,575 ) (152,365,227 ) (850,536,754 ) (39,124,631 ) (153,161,770 ) (36,990,666 ) (5,916,763 ) — — — — (1,601,055,365 ) Depreciation and amortization (45,709,123 ) (2,198,867 ) (15,095,115 ) (74,673,473 ) (1,906,164 ) (13,192,369 ) (2,890,563 ) (1,038,839 ) — — — — (156,704,513 ) Reclassifications 2,799,244 — (72,841 ) — (69,236 ) 1,146,904 102,375 14,532 — — — — 3,920,978 Disposals 8,902,711 127,458 7,573,769 16,810,591 59,022 — 805,916 222,764 — — — — 34,502,231 Balances as of December 31, 2017 Ps.(394,024,147 ) (5,013,984 ) (159,959,414 ) (908,399,636 ) (41,041,009 ) (165,207,235 ) (38,972,938 ) (6,718,306 ) — — — — (1,719,336,669 ) Wells, pipelines, properties, plant and equipment—net as of December 31, 2016 Ps. 398,429,131 20,326,541 307,780,201 468,286,163 23,618,402 169,542,435 13,756,021 13,526,082 207,414,148 44,571,618 — 491,506 1,667,742,248 Wells, pipelines, properties, plant and equipment—net as of December 31, 2017 Ps. 362,001,214 18,429,132 321,908,762 359,348,274 23,659,462 148,222,706 12,084,714 16,453,330 129,736,382 44,546,699 — 118,651 1,436,509,326 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 — — — — — a. As of December 31, 2017, 2016 and 2015, 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. 3,060,963, Ps. 3,667,752 and Ps. 5,258,854, respectively. b. The combined depreciation of fixed assets and amortization of wells for the fiscal years ended December 31, 2017, 2016 and 2015, recognized in operating costs and expenses, was Ps.156,704,513, Ps. 150,439,491 and Ps. 167,951,250, respectively, which includes costs related to plugging and abandonment of wells for the years ended December 31, 2017, 2016 and 2015 of Ps. 850,015, Ps. 1,698,312, and Ps. 1,401,870, respectively. c. As of December 31, 2017 and 2016, provisions relating to future plugging of wells costs amounted to Ps. 68,797,600 and Ps. 64,967,710, respectively, and are presented in the “Provisions for plugging of wells” (see Note 18). d. As of December 31, 2017 and 2016, acquisitions of property, plant and equipment include transfers from wells unassigned to a reserve for Ps. 16,440,645 and Ps. 16,393,773, respectively (see Note 13) and Ps. 4,652,314 from available-for-sale non-financial e. As of December 31, 2017 and 2016, PEMEX recognized a net impairment of Ps. 151,444,560 and a net reversal of impairment of Ps. 331,314,343, respectively, which is presented as a separate line item in the consolidated statement of comprehensive income as follows:
Assets Acquired Through Capital Leases	As of December 31, 2017 and 2016, assets acquired through these capital leases were as follows: 2017 2016 Investment in tankers and drilling equipment Ps. 11,142,197 Ps. 11,142,197 Less accumulated depreciation (1,696,089 ) (1,274,314 ) Ps. 9,446,108 Ps. 9,867,883
Summary of Maturity Analysis of Finance Lease Payables	The liabilities relating to the assets listed above are payable in the years following December 31, 2017 as presented below: Year Pesos U.S. dollars 2018 Ps. 1,867,411 94,377 2019 1,192,496 60,268 2020 1,192,496 60,268 2021 1,192,496 60,268 2022 1,192,496 60,268 2023 and thereafter 2,158,559 109,091 8,795,954 444,540 Less: short-term unaccrued interest 331,412 16,749 Less: long-term unaccrued interest 843,480 42,630 Total capital leases 7,621,062 385,161 Less: current portion of leases (excluding interest) 1,543,881 78,026 Total long-term capital leases Ps. 6,077,181 U.S. $ 307,135
Consolidated and Separate Financial Statements	Profit-sharing License As of /For the year ended EK / Balam Block 2 Block 8 Trion Block 3 Total Sales: Net sales Ps. 7,009,464 Ps. — Ps. — Ps. — Ps. — Ps. 7,009,464 Cost of sales 5,447,955 5,953 4,845 — 511 5,459,264 Gross income (loss) 1,561,509 (5,953 ) (4,845 ) — (511 ) 1,550,200 Other income (loss), net 4,852 — — — — 4,852 Administrative expenses 34,338 — — — — 34,338 Operating income (loss) 1,532,023 (5,953 ) (4,845 ) — (511 ) 1,520,714 Taxes, duties and other 158,347 — — — — 158,347 Net income (loss) Ps. 1,373,676 Ps. (5,953 ) Ps. (4,845 ) Ps. — Ps. (511 ) Ps. 1,362,367 Cash and cash equivalents Ps. — Ps. 20 Ps. 25 Ps. — Ps. — Ps. 45 Accounts receivable — 1,013 1,804 — 327 3,144 Total current assets — 1,033 1,829 — 327 3,189 Wells, pipelines, properties, plant and equipment, net 14,869,906 — — 4,498,234 1,107,311 20,475,451 Total assets 14,869,906 1,033 1,829 4,498,234 1,107,638 20,478,640 Suppliers 796,300 — — — — 796,300 Taxes and duties payable 973 — — — — 973 Other current liabilities 4,391 1,809 2,369 — — 8,569 Total current liabilities 801,664 1,809 2,369 — — 805,842 Total liabilities Ps. 801,664 Ps. 1,809 Ps. 2,369 Ps. — Ps. — Ps. 805,842 Equity (deficit), net Ps. 14,068,242 Ps. (776 ) Ps. (540 ) Ps. 4,498,234 Ps. 1,107,638 Ps. 19,672,798
Pemex industrial transformation [member]
Assumptions to Determine Net Present Value of Reserves Long Lived Assets	To determine the value in use of long-lived assets associated with the cash-generating units of Pemex Industrial Transformation, the net present value of cash flows was determined based on the following assumptions: Refining Gas Petrochemicals Average crude oil Price 51.30 U.S. dollars N.A. N.A. Processed volume 767 mbd 3,085 mmpcd or sour gas Variable because the Rate of U.S. dollar Ps.19.7867 mxp/usd Ps.19.7867 mxp/usd Ps.19.7867 mxp/usd Useful lives of the cash generating units Average of 16 years Average of 9 years Average of 6 years Discount rate 11.53% annually 10.24% annually 9.71% annually Period 2018-2034 2018-2029 2016-2024 To determine the value in use of long-lived assets associated with the cash-generating units of Pemex Industrial Transformation, the net present value of cash flows was determined based on the following assumptions: Refining Gas Petrochemicals Average crude oil price 52.30 U.S. dollars N.A. N.A. Processed volume 1,100 mbd 3,085 mmpcd or sour gas Variable because the Rate of U.S. dollar Ps.20.6640 mxp/usd Ps.20.6640 mxp/usd Ps.20.6640 mxp/usd Useful lives of the cash generating units Average of 14 years Average of 10 years Average of 4 years Discount rate 12.06% annually 10.72% annually 10.29% annually Period 2018-2034 2018-2029 2016-2024
Pemex exploration and production [member]
Assumptions to Determine Net Present Value of Reserves Long Lived Assets	To determine the value in use of long-lived assets associated with hydrocarbon extraction, the net present value of reserves is determined based on the following assumptions: Average crude oil price 55.89 U.S. dollars/bl Average gas price 4.92 U.S. dollars /mpc Average condensates price 38.33 U.S. dollars /bl Discount rate 14.40% annually 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: Average crude oil price 60.24 U.S. dollars/bl Average gas price 4.69 U.S. dollars/mpc Average condensates price 40.22 U.S. dollars/bl Discount rate 14.36% annually
Fixed assets [member] | Pemex industrial transformation [member]
Summary of Net Impairment and Net Reversal of Impairment	The impairment was in the following cash generating units: Minatitlán Refinery Ps. (5,691,005 ) Madero Refinery (8,480,880 ) Salina Cruz Refinery (5,579,997 ) Total impairment of assets (19,751,882 ) Cangrejera Petrochemical Center 3,565,355 Independencia Petrochemical Center 112,292 Arenque gas processor complex 57,039 Matapionche gas processor complex 65,104 Reversal of impairment 3,799,790 Net impairment Ps. (15,952,092 ) As of December 31, 2017, the value in use for the impairment or reversal of impairment of fixed assets was as follows: Minatitlán Refinery Ps. 32,531,925 Madero Refinery 11,420,952 Salina Cruz Refinery 12,051,597 Cangrejera Petrochemical Center 17,544,825 Independencia Petrochemical Center 3,146,413 Arenque gas processor complex 1,283,201 Matapionche gas processor complex 1,074,729 Total value in use Ps. 79,053,642 The net reversal of impairment was in the following cash generating units: Minatitlán Refinery Ps. 33,165,095 Madero Refinery 21,833,892 Arenque gas processor complex 268,161 Reversal of impairment 55,267,148 Cangrejera Petrochemical Center (2,590,870 ) Independencia Petrochemical Center (112,292 ) Matapionche gas processor complex (65,105 ) Total impairment of assets (2,768,267 ) Net reversal of impairment Ps. 52,498,881 As of December 31, 2017, the value in use for the impairment or reversal of impairment of fixed assets was as follows: Minatitlán Refinery Ps. 43,856,284 Madero Refinery 33,961,120 Salina Cruz Refinery 36,057,410 Cangrejera Petrochemical Center 2,441,686 Independencia Petrochemical Center 1,706,687 Arenque gas processor complex 473,499 Matapionche gas processor complex 572,909 Total value in use Ps. 119,069,595
PEMEX [member]
Summary of Net Impairment and Net Reversal of Impairment	i. As of December 31, 2017, the net impairment was as follows: Impairment Reversal of Net Pemex Exploration and Production Ps. (129,350,315 ) Ps. — Ps. (129,350,315 ) Pemex Industrial Transformation (19,751,882 ) 3,799,790 (15,952,092 ) AGRO (4,206,653 ) — (4,206,653 ) Pemex Fertilizers (1,935,500 ) — (1,935,500 ) Total Ps. (155,244,350 ) Ps. 3,799,790 Ps. (151,444,560 ) ii. As of December 31, 2016, the net reversal of impairment was as follows: Impairment Reversal of Reversal of Pemex Exploration and Production Ps. (16,872,238 ) Ps. 288,581,670 Ps. 271,709,432 Pemex Industrial Transformation (2,768,267 ) 55,267,148 52,498,881 Pemex Logistics — 5,829,520 5,829,520 Pemex Ethylene — 1,276,510 1,276,510 Total Ps. (19,640,505 ) Ps. 350,954,848 Ps. 331,314,343

Intangible Assets (Tables)

Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2017
Text block1 [abstract]
Schedule of Intangible Assets are Wells Unassigned to a Reserve	At December 31, 2017 and 2016, intangible assets are wells unassigned to a reserve, which amounted Ps. 9,088,563 and Ps. 8,639,242, respectively as follows: 2017 2016 Wells unassigned to a reserve: Balance at the beginning of period Ps. 8,639,242 Ps. 14,304,961 Additions to construction in progress 20,553,952 20,526,300 Transfers against expenses (3,663,986 ) (9,798,246 ) Transfers against fixed assets (16,440,645 ) (16,393,773 ) Balance at the end of period Ps. 9,088,563 Ps. 8,639,242

Long-Term Notes Receivable an44

Long-Term Notes Receivable and Other Assets (Tables)	12 Months Ended
	Dec. 31, 2017
Text block1 [abstract]
Summary of Long-Term Notes Receivable	As of December 31, 2017 and 2016, the balance of long-term notes receivable was as follows: 2017 2016 Promissory notes issued by the Mexican Government Ps . 147,274,076 Ps .140,578,871 Other long-term notes receivable (1) 1,218,833 8,028,731 Total long-term notes receivable Ps . 148,492,909 Ps .148,607,602 (1) For 2016, primarily CENAGAS.
Summary of Promissory Notes Issued	Promissory notes issued by the Mexican Government 2017 2016 Total promissory notes Ps .149,796,282 Ps .142,124,620 Less: current portion of notes receivable (1) 2,522,206 1,545,749 Long-term promissory notes Ps .147,274,076 Ps .140,578,871 (1) The current portion of the promissory notes and the total yield payments are allocated under sundry debtors in accounts receivable, net (see Note 7).
Summary of Promissory Notes Maturity Dates and Annual Rates	As of December 31, 2017 and 2016, these promissory notes at discount valued amounted to Ps. 147,274,076 and Ps. 140,578,871, respectively. PEMEX intends is to hold them to maturity. These promissory notes will be converted into cash with annual maturity dates ranging from 2018 to 2042 and annual rates ranging from 4.65% to 7.03% in 2017 and ranging from 2017 to 2042 and annual rates ranging from 4.35% to 7.04% in 2016, as follows: As of December 31, 2017 Number of Promissory Notes Maturity Yield Rate Range Principal Amount 1 2018 4.65% Ps. 2,522,206 1 2019 5.14% 3,580,302 1 2020 5.39% 4,421,320 1 2021 5.57% 5,238,081 1 2022 5.74% 5,804,485 5 2023 to 2027 5.87% to 6.32% 34,196,434 5 2028 to 2032 6.47% to 6.81% 35,338,617 5 2033 to 2037 6.85% to 7.03% 32,789,697 5 2038 to 2042 7.02% to 6.94% 25,905,140 Total promissory notes 149,796,282 Less: current portion Ps. 2,522,206 Long-term notes receivable Ps. 147,274,076 As of December 31, 2016 Number of Promissory Notes Maturity Yield Rate Range Principal Amount 1 2017 4.35% Ps. 1,545,749 1 2018 4.65% 2,408,634 1 2019 5.14% 3,402,849 1 2020 5.39% 4,192,132 1 2021 5.57% 4,957,840 5 2022 to 2026 4.74% a 6.11% 30,986,252 5 2027 to 2031 6.32% a 6.77% 33,280,216 5 2032 to 2036 6.81% a 7.00% 31,370,504 6 2037 to 2042 6.94% a 7.04% 29,980,444 Total promissory notes Ps. 142,124,620 Less: current portion 1,545,749 Long-term notes receivable Ps. 140,578,871
Summary of Other Assets	At December 31, 2017 and 2016, the balance of other assets was as follows: 2017 2016 Payments in advance Ps. 4,683,117 Ps. 2,558,767 License 2,162,151 1,813,605 Rights-of-way 1,967,304 1,940,157 Other 2,672,605 3,200,116 Total other assets Ps. 11,485,177 Ps. 9,512,645

Debt (Tables)

Debt (Tables)	12 Months Ended
	Dec. 31, 2017
Text block1 [abstract]
Summary of Long-term Debt	As of December 31, 2017, long-term debt was as follows: Pesos Foreign currency Rate of interest (1) Maturity (thousands) (thousands) U.S. dollars Bonds Fixed from 1.7% to 9.5% and LIBOR plus 0.35% to 3.65% Various to 2047 Ps. 1,138,845,231 US$ Purchasing loans LIBOR plus 0.85% Various to 2018 25,722,710 1,300,000 Project financing Fixed from 2.35% to 3.81% and LIBOR plus 0.24% to 1.75% Various to 2025 64,974,389 3,283,741 Direct loans Fixed from 5.25% to 5.44% and LIBOR plus 1.65% Various to 2020 43,141,231 2,180,315 Syndicated loans LIBOR plus 0.85% Various to 2020 39,347,774 1,988,597 Bank loans Fixed from 3.5% to 5.28% Various to 2023 3,451,629 174,442 Financial leases Fixed from 0.38% to 1.99% Various to 2025 7,621,062 385,161 Lease-back (See Financing activities for 2016 l) and m)) (4) Fixed from 0.45% to 0.7% Various to 2036 32,677,268 1,651,476 Total financing in U.S. dollars 1,355,781,294 US$ 68,519,829 Euros Bonds Fixed from 1.875% to 5.5% Various to 2030 287,386,195 € 12,097,975 Project financing Fixed from 2.1% to 5.11% Various to 2023 11,879,379 500,081 Total financing in Euros 299,265,574 € 12,598,056 Japanese yen: Bonds Fixed from 0.54% to 3.5% and LIBOR yen plus 0.75% Various to 2026 30,541,407 ¥ 173,827,018 Pesos Certificados bursátiles Mexican Government Treasury Certificates (“Cetes”) , TIIE (1) Various to 2026 Ps. 149,564,918 Direct loans Fixed at 6.55% and TIIE plus 0.85% to 1.25% Various to 2025 28,597,423 Syndicated loans TIIE plus 0.95 Various to 2025 33,646,107 Total financing in pesos Ps. 211,808,448 Unidades de Inversión Certificados bursátiles Certificados bursátiles Zero rate and Fixed at 3.02% to 5.23% Various to 2035 57,197,211 Other currencies: Bonds Fixed from 1.5% to 8.25% Various to 2025 47,148,936 Total principal in pesos (2) 2,001,742,870 Plus: accrued interest 32,078,624 Notes payable to contractors (3) 4,053,577 Total principal and interest 2,037,875,071 Less: short-term maturities 122,957,558 Current portion of notes payable to contractors (3) 2,173,285 Accrued interest 32,078,624 Total short-term debt and current portion of long-term debt 157,209,467 Long-term debt (Note 16(c)) Ps. 1,880,665,604 As of December 31, 2016, long-term debt was as follows: Rate of interest (1) Maturity Pesos (thousands) Foreign currency U.S. dollars Bonds Fixed from 3.125% to 9.5% and LIBOR plus 0.35% to 2.02% Various to 2046 Ps. 1,131,389,914 U.S. $ 54,751,738 Purchasing loans LIBOR plus 0.8% to 0.85% Various to 2016 2,479,680 120,000 Project financing Fixed from 2.35% to 5.45% and LIBOR plus 0.01% to 1.71% Various to 2021 84,711,684 4,099,481 Direct loans Fixed at 5.44% and LIBOR plus 1.0% Various to 2018 33,100,587 1,601,848 Syndicated loans LIBOR plus 0.85% Various to 2020 41,056,571 1,986,865 Bank loans Fixed from 3.5% to 5.28% Various to 2023 4,339,826 210,019 Financial leases Fixed from 0.38% to 1.99% Various to 2025 9,559,060 462,595 Lease-back (See Financing activities for 2016 l) and m)) (4) Fixed from 0.45% to 0.7% Various to 2036 35,513,114 1,718,598 Total financing in U.S. dollars 1,342,150,436 U.S. $ 64,951,144 Euros Bonds Fixed from 3.125% to 6.375% Various to 2030 196,317,016 € 9,058,388 Project financing Fixed at 2% Various to 2016 10,836,200 500,000 Total financing in Euros 207,153,216 € 9,558,388 Japanese yen: Bonds Fixed at 3.5% and LIBOR yen plus 0.75% Various to 2023 30,800,746 ¥ 173,809,300 Project financing Fixed at 1.56% and Prime Rate yen plus 2.56% Various to 2017 517,286 2,919,056 Total financing in yen 31,318,032 ¥ 176,728,356 Pesos Certificados bursátiles Mexican Government Treasury Certificates (“Cetes”) , TIIE (1) Various to 2026 Ps. 173,151,985 Direct loans Fixed at 6.55% and TIIE plus 0.55% to 1.25% Various to 2025 45,563,848 Syndicated loans TIIE plus 0.95 Various to 2025 38,538,961 Revolved loans TIIE plus 0.55 To 2016 20,000,000 Total financing in pesos Ps. 277,254,794 Unidades de Inversión Certificados bursátiles Certificados bursátiles Zero rate and Fixed at 3.02% to 5.23% Various to 2035 53,703,421 Other currencies: Bonds Fixed from 2.5% to 8.25% Various to 2022 36,786,665 Total principal in pesos (2) 1,948,366,564 Plus: accrued interest 27,815,467 Notes payable to contractors (3) 6,988,699 Total principal and interest 1,983,170,730 Less: short-term maturities 144,169,619 Current portion of notes payable to contractors (3) 4,181,102 Accrued interest 27,815,467 Total short-term debt and current portion of long-term debt 176,166,188 Long-term debt (Note 16(c)) Ps. 1,807,004,542
Summary of Notes Payable to Contractors	(3) The total amounts of notes payable to contractors as of December 31, 2017 and 2016, current and long-term, are as follows: 2017 2016 Total notes payable to contractors (a)(b) Ps.4,053,577 Ps.6,988,699 Less: current portion of notes payable to contractors 2,173,285 4,181,102 Notes payable to contractors (long-term) Ps.1,880,292 Ps.2,807,597 (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, 2017 and 2016, PEMEX had an outstanding amount payable of Ps. 1,678,843 and Ps. 3,986,565, 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, 2017 and 2016, the outstanding balances owed to the contractor were Ps. 2,374,734 (U.S. $120,017) and Ps. 3,002,134 (U.S. $145,283), respectively. In accordance with the contract, the estimated future payments are as follows:
Summary of Estimated Future Contract Payments	(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, 2017 and 2016, the outstanding balances owed to the contractor were Ps. 2,374,734 (U.S. $120,017) and Ps. 3,002,134 (U.S. $145,283), respectively. In accordance with the contract, the estimated future payments are as follows: Year Amount 2018 U.S.$ 25,267 2019 25,267 2020 25,267 2021 25,267 2022 18,949 Total U.S $ 120,017
Summary of Outstanding Liability Transaction Payable	The outstanding liability for this transaction is payable as follows: Years Pesos U.S. dollars 2018 Ps. 3,957,317 U.S. $ 199,999 2019 3,886,037 196,396 2020 3,886,037 196,396 2021 3,886,037 196,396 2022 3,886,037 196,396 2023 and thereafter 39,450,325 1,993,781 58,951,790 2,979,364 Less: short-term unaccrued interest 2,399,475 121,267 Less: long-term unaccrued interest 23,875,047 1,206,621 Total financing 32,677,268 1,651,476 Less: short-term portion of financing (excluding interest) 1,557,842 78,732 Total long term financing Ps. 31,119,426 U.S.$ 1,572,744
Summary of Foreign Currency Translation	(5) As of December 31, 2017 and 2016, PEMEX used the following exchange rates to translate the outstanding balances in foreign currencies to pesos in the statement of financial position: 2017 2016 U.S. dollar Ps. 19.7867 Ps. 20.6640 Japanese yen 0.1757 0.1772 Pounds sterling 26.7724 25.3051 Euro 23.7549 21.6724 Swiss francs 20.2992 20.1974 Canadian dollar 15.7858 15.2896 Australian dollar 15.4752 14.8842
Summary of Maturities of Long Term Debt Principal Outstanding and Accrued Interest	2018 2019 2020 2021 2022 2023 and thereafter Total Maturity of the total principal outstanding and accrued interest as of December 31, 2017, for each of the years ending December 31. Ps.157,209,467 Ps.159,403,397 Ps,209,915,748 Ps.185,307,669 Ps.158,761,145 Ps.1,167,277,645 Ps.2,037,875,071
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, 2017 and 2016, which includes short and long-term debt: 2017 (i) 2016 (i) Changes in total debt: At the beginning of the year Ps.1,983,170,730 Ps.1,493,381,835 Cash flows: Loans obtained—financing institutions 704,715,468 829,579,084 Loans obtained—financing lease — 21,924,053 Debt payments (642,059,819 ) (614,987,329 ) Interest paid (108,910,417 ) (88,757,428 ) Non-cash Foreign exchange (16,685,439 ) 243,182,764 Accrued interest 117,644,548 98,847,751 At the end of the year Ps.2,037,875,071 Ps.1,983,170,730

Derivative Financial Instrume46

Derivative Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2017
Text block1 [abstract]
Details of Interest Rate Sensitivity	INTEREST RATE and CURRENCY DFIs Interest rate sensitivity to + 10 bp Interbank Yield Curves PEMEX Curves Currency Sensitivity Sensitivity Sensitivity in thousands U.S. dollars CHF 3,144 (3,144 ) — 3,030 Euro 100,081 (84,962 ) 15,119 82,839 Pound Sterling 7,691 (7,073 ) 618 6,587 Yen 8,542 (3,972 ) 4,570 6,877 Peso 43,774 2,039 45,813 42,012 UDI 16,496 (11,586 ) 4,910 15,453 U.S. dollar 785,508 89,880 875,388 416,052
Details of Interest Rate and Currency Derivative Financial Instruments	INTEREST RATE and CURRENCY DFIs Interbank Yield Curves PEMEX Curves Currency 1% 1% 1% VaR 95% in thousands U.S. dollars CHF (13,943 ) 13,943 — — (13,624 ) Euro (187,988 ) 165,894 (22,094 ) (19,744 ) (167,068 ) Pound Sterling (13,822 ) 13,042 (780 ) (666 ) (12,322 ) Yen (16,914 ) 11,470 (5,444 ) (4,398 ) (14,859 ) Peso (135,974 ) 1,409 (134,565 ) (162,336 ) (133,525 ) UDI (29,485 ) 25,358 (4,127 ) (5,038 ) (28,573 )
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 year 1-3 3-5 5-7 7-10 years More than 10 years in thousands U.S. dollars A 257,424 976,230 1,298,110 1,314,296 578,548 482,959 — A- 138,850 235,594 191,681 228,801 223,751 257,465 — BBB+ 310,705 1,010,356 1,540,015 1,349,311 1,243,898 1,115,559 78,831 BBB 2,183 18,626 20,064 18,092 — — —
Details of Notional Amounts of Investments in Domestic Currency and Organized By the Credit Ratings of the Issuances	As of December 31, 2017, the notional amounts of investments in domestic currency, organized by the credit ratings of the issuances, were as follows: Credit rating of issuances* Notional amount mxAAA Ps. 811,548 mxAA 200,876 mxA 271,275 * Minimum S&P, Moody’s and Fitch credit rating.
Schedule of Current and Potential Exposure, Aggregated By Credit Rating and Derivative Financial Instruments	Maximum Credit Exposure by term in Pemex Industrial Transformation Rating Current Less than 1 year 1-3 years 3-5 years 5-7 years 7-10 years More than 10 years in thousands U.S. dollars A 27 27 — — — — — A- 541 541 306 — — — — BBB+ 25 25 1 — — — —
Details of Quantitative Disclosure of Debt Cash Flow's Maturities	Quantitative Disclosure of Debt Cash Flow’s Maturities as of December 31, 2017 (1) Year of expected maturity date 2018 2019 2020 2021 2022 2023 thereafter Total carrying value Fair value Liabilities Outstanding debt Fixed rate (U.S. dollars) Ps 53,465,817 Ps 59,498,256 Ps 60,290,621 Ps 95,232,448 Ps 84,076,050 Ps 808,836,547 Ps 1,161,399,739 Ps . 1,213,404,769 Average interest rate (%) 5.7747 % Fixed rate (Japanese yen) — — — — — 19,296,607 19,296,607 18,040,398 Average interest rate (%) 1.3485 % Fixed rate (Pounds) — — — — 9,345,839 11,952,816 21,298,655 24,381,394 Average interest rate (%) 5.7246 % Fixed rate (pesos) — — 10,033,017 20,376,655 1,999,098 88,349,072 120,757,842 171,683,692 Average interest rate (%) 7.4876 % Fixed rate (UDIs) — 18,477,076 4,764,175 3,874,313 — 30,081,647 57,197,211 56,536,905 Average interest rate (%) 2.7458 % Fixed rate (euros) 1,043 32,042,196 30,801,894 41,508,857 23,655,950 171,255,634 299,265,574 330,573,998 Average interest rate (%) 3.6736 % Fixed rate (Swiss Francs) 4,565,075 6,088,686 12,149,953 3,046,567 — — 25,850,281 26,957,785 Average interest rate (%) 1.8387 % Fixed rate (Australian dollars) — — — — — — — — Average interest rate (%) — — — — — — — — Total fixed rate debt 58,031,935 116,106,214 118,039,660 164,038,840 119,076,937 1,129,772,323 1,705,065,909 1,841,578,940 Variable rate (U.S. dollars) 58,364,536 15,302,101 62,289,546 12,809,666 31,289,725 18,379,557 198,435,131 206,254,219 Variable rate (Japanese yen) — — 11,244,800 — — — 11,244,800 11,361,079 Variable rate (pesos) 8,734,371 27,995,083 18,341,742 8,459,163 8,394,483 19,125,764 91,050,606 94,188,981 Total variable rate debt 67,098,907 43,297,184 91,876,088 21,268,829 39,684,208 37,505,321 300,730,537 311,804,280 Total debt Ps . 125,130,842 Ps . 159,403,398 Ps . 209,915,748 Ps . 185,307,669 Ps . 158,761,145 Ps .1,167,277,644 Ps . 2,005,796,446 Ps .2,153,383,220 Note: Numbers may not total due to rounding. (1) The information in this table has been calculated using exchange rates at December 31, 2017 of: Ps. 19.7867 = U.S. $1.00; Ps. 0.1757 = 1.00 Japanese yen; Ps. 26.7724 = 1.00 Pound sterling; Ps. $ 5.934551 = 1.00 UDI; Ps. 23.7549 = 1.00 euro; Ps. 20.2992 = 1.00 Swiss Franc; and Ps. 15.4752 = 1.00 Australian dollar. Source: PEMEX Quantitative Disclosure of Debt Cash Flow’s Maturities as of December 31, 2016 (1) Year of expected maturity date 2017 2018 2019 2020 2021 2022 thereafter Total carrying value Fair value Liabilities Outstanding debt Fixed rate (U.S. dollars) Ps 15,759,027 Ps 86,161,096 Ps 65,642,616 Ps 62,440,943 Ps 98,858,992 Ps 826,093,574 Ps 1,154,956,248 Ps 1,137,936,275 Average interest rate (%) 5.6541 % Fixed rate (Japanese yen) 517,286 — — — — 19,459,306 19,976,592 17,336,203 Average interest rate (%) 1.3665 % Fixed rate (Pounds) — — — — — 8,825,434 8,825,434 11,373,345 Average interest rate (%) 8.2500 % Fixed rate (pesos) — — — 10,048,950 20,457,671 90,393,507 120,900,128 160,930,040 Average interest rate (%) 7.4878 % Fixed rate (UDIs) — — 17,319,897 4,464,787 3,630,557 28,288,180 53,703,421 50,809,979 Average interest rate (%) 4.0559 % Fixed rate (euros) 26,006,880 — 29,198,138 28,061,554 — 123,886,644 207,153,216 216,100,006 Average interest rate (%) 3.9581 % Fixed rate (Swiss Francs) — 4,539,022 6,056,338 12,102,748 3,031,480 — 25,729,588 26,469,543 Average interest rate (%) 1.8385 % Fixed rate (Australian dollars) 2,232,195 — — — — — 2,232,195 2,346,390 Average interest rate (%) — — — — — — 6.1250 % — Total fixed rate debt 44,515,388 90,700,118 118,216,989 117,118,982 125,978,700 1,096,946,645 1,593,476,822 1,623,301,781 Variable rate (U.S. dollars) 38,811,320 27,907,661 15,984,547 52,726,647 13,366,336 45,385,885 194,182,396 195,838,382 Variable rate (Japanese yen) — — — 11,341,440 — — 11,341,440 11,025,531 Variable rate (euros) — — — — — — — — Variable rate (pesos) 65,024,075 8,742,191 28,007,709 18,347,822 8,468,176 27,764,693 156,354,666 158,109,920 Total variable rate debt 103,835,395 36,649,852 43,992,256 82,415,909 21,834,512 73,150,578 361,878,502 364,973,833 Total debt Ps. 148,350,783 Ps. 127,349,970 Ps. 162,209,245 Ps. 199,534,891 Ps. 147,813,212 Ps. 1,170,097,223 Ps. 1,955,355,324 Ps. 1,988,275,614 Note: Numbers may not total due to rounding. (1) The information in this table has been calculated using exchange rates at December 31, 2016 of: Ps. 20.664 = U.S. $1.00; Ps. 0.17721 = 1.00 Japanese yen; Ps. 25.30513 = 1.00 Pound sterling; Ps. $ 5.562883 = 1.00 UDI; Ps. 21.6724 = 1.00 euro; Ps. 20.19744= 1.00 Swiss Franc; and Ps. 14.88428 = 1.00 Australian dollar.
Summary of Quantitative Disclosure of Cash Flow's Maturities	Quantitative Disclosure of Cash Flow’s Maturities from Derivative Financial Instruments Held or Issued for Purposes Other than Trading as of December 31, 2017 (1)(2) Year of expected maturity date Total Fair (3) 2018 2019 2020 2021 2022 2023 Thereafter Hedging instruments (2)(4) Interest rate DFIs Interest rate swaps (U.S. dollars) Variable to fixed Ps. 4,704,170 Ps. 4,717,321 Ps. 4,730,857 Ps. 4,686,396 Ps 4,570,070 Ps 10,143,209 Ps. 33,552,022 Ps. 388,851 Average pay rate 3.16 % 3.18 % 3.20 % 3.22 % 3.26 % 3.48 % N.A. N.A. Average receive rate 3.19 % 3.44 % 3.69 % 3.81 % 3.95 % 4.48 % N.A. N.A. Interest rate swaps (pesos) Variable to fixed — — — — — — — — Average pay rate N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. Average receive rate N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. Currency DFIs Cross-currency swaps Receive euros/Pay U.S. dollars — 29,898,198 28,719,208 36,902,690 21,302,856 161,617,172 278,440,124 19,065,727 Receive Japanese yen/ Pay U.S. dollars — — 13,039,563 — — 4,775,551 17,815,114 (1,670,533 ) Receive Pounds sterling/ Pay U.S. dollars — — — — 10,310,216 11,706,999 22,017,215 1,151,096 Receive UDI/ Pay pesos — 23,740,341 7,292,520 3,000,000 — 20,605,166 54,638,028 (4,720,592 ) Receive Swiss francs/ Pay U.S. dollars 4,535,474 6,501,082 11,548,658 2,994,374 — — 25,579,588 400,316 Receive Australian dollars/ Pay U.S. dollars — — — — — — — — Currency Options Buy Put, Sell Put and Sell Call on Japanese yen — — — — — 14,046,320 14,046,320 48,715 Buy call, Sell call and Sell Put on euros — — — 41,567,998 — 59,382,855 100,950,853 4,919,444 Sell Call on Pound sterling — — — — — 12,031,728 12,031,728 (239,626 ) Currency Forwards Receive U.S. dollars / Pay pesos 59,360,100 — — — — — 59,360,100 (2,006,461 ) N.A. = not applicable. Numbers may not total due to rounding. (1) The information in this table has been calculated using exchange rates at December 31, 2017 of: Ps. 19.7867 = U.S. $1.00 and Ps. 23.7549 = 1.00 euro. (2) PEMEX’s management uses these DFIs to hedge market risk; however, these DFIs do not qualify for accounting purposes as hedges and are recorded in the financial statements as entered into for trading purposes. (3) Positive numbers represent a favorable fair value to PEMEX. (4) PMI’s risk management policies and procedures establish that DFIs should be used only for hedging purposes; however DFIs are not recorded as hedges for accounting purposes. Source: PEMEX Quantitative Disclosure of Cash Flow’s Maturities from Derivative Financial Instruments Held or Issued for Purposes Other than Trading as of December 31, 2016 (1)(2) Year of expected maturity date Total Fair (3) 2017 2018 2019 2020 2021 2022 Thereafter Hedging instruments (2)(4) Interest rate DFIs Interest rate swaps (U.S. dollars) Variable to fixed Ps. 4,899,645 Ps. 4,912,743 Ps. 4,926,477 Ps. 4,940,613 Ps 4,894,180 Ps 15,365,634 Ps. 39,939,292 Ps. 164,716 Average pay rate 2.76 % 2.66 % 3.35 % 3.83 % 4.04 % 4.57 % N.A. N.A. Average receive rate 2.95 % 2.99 % 3.03 % 3.06 % 3.11 % 3.33 % N.A. N.A. Interest rate swaps (pesos) Variable to fixed — — — — — — — — Average pay rate N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. Average receive rate N.A. N.A. N.A. N.A. N.A. N.A. N.A. N.A. Currency DFIs Cross-currency swaps Receive euros/Pay U.S. dollars 34,775,198 — 31,223,821 29,992,556 — 133,024,913 229,016,488 (16,484,533 ) Receive Japanese yen/ Pay U.S. dollars 532,711 — — 17,697,534 — 4,987,289 23,217,534 (6,132,633 ) Receive Pounds sterling/ Pay U.S. dollars — — — — — 10,767,349 10,767,349 (211,207 ) Receive UDI/ Pay pesos — — 23,740,341 3,540,220 3,000,000 14,313,198 44,593,759 (2,132,236 ) Receive Swiss francs/ Pay U.S. dollars — 4,736,567 6,789,326 12,060,700 3,127,139 — 26,713,732 (789,449 ) Receive Australian dollars/ Pay U.S. dollars 2,459,429 — — — — — 2,459,429 (126,796 ) Currency Options Buy Put, Sell Put and sell Call on yen — — — — — 14,133,580 14,133,580 (301,131 ) N.A. = not applicable. Numbers may not total due to rounding. (1) The information in this table has been calculated using exchange rates at December 31, 2016 of: Ps. 20.664 = U.S. $1.00 and Ps. 21.6724 = 1.00 euro. (2) PEMEX’s management uses these DFIs to hedge market risk; however, these DFIs do not qualify for accounting purposes as hedges and are recorded in the financial statements as entered into for trading purposes. (3) Positive numbers represent a favorable fair value to PEMEX. (4) PMI’s risk management policies and procedures establish that DFIs should be used only for hedging purposes; however DFIs are not recorded as hedges for accounting purposes.
Summary of Fair Values and Notional Amounts of DFIs that were designated as non-hedges	December 31, 2017 December 31, 2016 DFI POSITION Notional Fair Value Notional Fair Value Interest rate swaps PEMEX pays fixed in U.S. dollar and receives floating in 3-month Ps.16,695,028 Ps. 79,448 Ps.20,018,250 Ps. (90,451 ) Interest rate swaps PEMEX pays fixed in U.S. dollar and receives floating in 6-month 15,433,626 332,273 18,132,660 312,210 Cross-currency swaps PEMEX pays fixed in pesos and receives notional in UDI. 23,740,341 (4,504,151 ) 23,740,341 (4,815,373 ) Cross-currency swaps PEMEX pays the 28-day 30,897,687 (216,441 ) 20,853,418 2,683,138 Cross-currency swaps PEMEX pays fixed in U.S. dollar and receives fixed in Japanese yen. 4,775,551 134,461 5,520,000 (116,507 ) Cross-currency swaps PEMEX pays floating in 6-month 6-month 13,039,563 (1,804,993 ) 17,697,534 (6,016,126 ) Cross-currency swaps PEMEX pays fixed in U.S. dollar and receives fixed in euro. 278,440,124 19,065,727 229,016,488 (16,484,533 ) Cross-currency swaps PEMEX pays fixed in U.S. dollar and receives fixed in Pound sterling. 11,706,999 590,113 — — Cross-currency swaps PEMEX pays floating in 6-month 10,310,216 560,982 10,767,349 (211,207 ) Cross-currency swaps PEMEX pays fixed in U.S. dollar and receives fixed in CHF. 25,579,588 400,316 26,713,732 (789,449 ) Cross-currency swaps PEMEX pays fixed in U.S. dollar and receives fixed in AUD. — — 2,459,429 (126,796 ) Currency Options PEMEX Buy Put, Sell Put and Sell Call on Japanese yen. 14,046,320 48,715 14,133,580 (301,131 ) Currency Options PEMEX Buy call, Sell call and Sell Put on euros. 100,950,853 4,919,444 — — Currency Options PEMEX Sell Call on Pound sterling 12,031,728 (239,626 ) — — Currency Forward PEMEX pays Pesos and receives U.S. dollar. 59,360,100 (2,006,461 ) — — Natural gas swaps PEMEX receives fixed. (51,724 ) 6,934 (160,214 ) (25,145 ) Natural gas swaps PEMEX receives floating. 50,846 (6,114 ) 157,545 27,869 Natural gas options PEMEX Long Call. 18,625 398 73,653 11,548 Natural gas options PEMEX Short Call. (18,625 ) (397 ) (73,653 ) (11,488 ) Interest rate swaps PEMEX pays fixed in U.S. dollar and receives floating in U.S. dollar LIBOR 1M. 1,423,368 (22,870 ) 1,788,382 (57,043 ) Ps.17,337,760 Ps. (26,010,486 ) December 31, 2017 December 31, 2016 DFI Volume Fair Value Volume Fair Crude Oil Options 153.56 Ps. (5,010,187 ) — — December 31, 2017 December 31, 2016 DFI Market Volume (MMb) Fair value Volume (MMb) Fair value Futures Exchange traded 2.1 Ps . (141,693 ) — Ps. — Petroleum Products Swaps Exchange traded 1.3 Ps . (99,680 ) 4.1 Ps. (688,016 ) Notes: Numbers 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 showed on 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, 2017 and 2016: Derivatives assets Fair value 2017 2016 Derivatives not designated as hedging instruments Crude oil options Ps. 397,630 Ps. — Currency options 4,968,159 — Natural gas options 398 11,548 Cross-currency swaps 24,126,452 4,503,550 Natural gas swaps 7,003 30,162 Propane swaps — — Interest rate swaps 411,721 312,210 Others 202,091 — Total derivatives not designated as hedging instruments 30,113,454 4,857,470 Total assets Ps. 30,113,454 Ps. 4,857,470 Derivatives liabilities Fair value 2017 2016 Derivatives not designated as hedging instruments Forwards Ps. (2,006,461 ) Ps. — Futures — — Crude oil options (5,407,817 ) — Currency options — (301,131 ) Natural gas options (397 ) (11,488 ) Cross-currency swaps (10,301,983 ) (30,380,405 ) Natural gas swaps (6,182 ) (27,438 ) Propane swaps — — Interest rate swaps (22,870 ) (147,494 ) Others (269 ) — Total derivatives not designated as hedging instruments (17,745,979 ) (30,867,956 ) Total liabilities Ps. (17,745,979 ) Ps. (30,867,956 ) Net total Ps. 12,367,475 Ps. (26,010,486 )
Summary of Net Gain (Loss) Recognized in Income on Derivative Financial Instruments	The following tables present the net gain (loss) recognized in income on PEMEX’s DFIs for the years ended December 31, 2017, 2016 and 2015, in the consolidated statement of comprehensive income which is presented in the line “Derivative financial instruments (cost) income, net”: Derivatives not designated as hedging instruments Amount of gain (loss) recognized in the 2017 2016 2015 Forwards Ps. (1,976,241 ) Ps. — Ps. — Futures (779,950 ) (1,925,969 ) 1,387,177 Crude oil options (3,771,604 ) — — Currency options 5,255,931 (298,789 ) — Natural gas options 673 (671 ) 4,786 Cross-currency swaps 27,747,290 (11,633,605 ) (21,358,898 ) Natural gas swaps 1,780 831 4,355 Propane swaps — (3,805 ) (1,136,188 ) Interest rate swaps (34,306 ) (138,979 ) (351,109 ) Others (1,105,249 ) — — Total Ps. 25,338,324 Ps. (14,000,987 ) Ps. (21,449,877 )
Schedule of Financial Assets and Liabilities Measured at Fair Value and Indicate the Fair Value Hierarchy of the Inputs Utilized to Determine the Fair Values	The following tables present information about PEMEX’s financial assets and liabilities measured at fair value and indicate the fair value hierarchy of the inputs utilized to determine the fair values as of December 31, 2017 and 2016. Fair value hierarchy Total as of 2017 Level 1 Level 2 Level 3 Assets: Derivative financial instruments Ps. — Ps. 30,113,454 Ps. — Ps. 30,113,454 Available-for-sale — 1,056,918 — 1,056,918 Liabilities: Derivative financial instruments — (17,745,979 ) — (17,745,979 ) Fair value hierarchy Total as of 2016 Level 1 Level 2 Level 3 Assets: Derivative financial instruments Ps. — Ps. 4,857,470 Ps. — Ps. 4,857,470 Available-for-sale 6,463,096 2,417,123 — 8,880,219 Liabilities: Derivative financial instruments — (30,867,956 ) — (30,867,956 )
Schedule of Carrying Value and the Estimated Fair Value of the Remaining Financial Assets and Liabilities	The following table shows the carrying value and the estimated fair value of the remaining financial assets and liabilities, which are not valued at fair value, as of December 31, 2017 and 2016: 2017 2016 Carrying value Fair value Carrying value Fair value Assets: Cash and cash equivalents Ps. 97,851,754 Ps. 97,851,754 Ps. 163,532,513 Ps. 163,532,513 Accounts receivable, net 170,645,234 170,645,234 133,220,527 133,220,527 Long-term notes receivable 148,492,909 148,492,909 148,607,602 148,607,602 Liabilities: Suppliers 139,955,378 139,955,378 151,649,540 151,649,540 Accounts and accrued expenses payable 23,211,401 23,211,401 18,666,607 18,666,607 Short-term debt and current portion of long-term debt 157,209,467 157,209,467 176,166,188 176,166,188 Long-term debt 1,880,665,604 1,996,173,753 1,807,004,542 1,812,109,426

Employee Benefits (Tables)

Employee Benefits (Tables)	12 Months Ended
	Dec. 31, 2017
Summary of Amounts Associated with PEMEX's Labor Obligations	The following table show the amounts associated with PEMEX’s labor obligations: December 31, Defined Benefits Liabilities 2017 2016 Liability for defined benefits at retirement and post-employment at the end of the year Ps. 1,241,072,307 Ps. 1,202,624,665 Liability for other long-term benefits 17,363,815 17,784,771 Total liability for defined benefits recognized in the consolidated statement of financial position at the end of the year Ps. 1,258,436,122 Ps. 1,220,409,436
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 2017 2016 Liability for defined benefits at the beginning of the year Ps. 1,202,624,665 Ps. 1,258,480,019 Recognition of the modifications in pensions plan 8,327 (571,713 ) Current Service cost 13,079,341 23,111,918 Net interest 95,402,917 90,527,624 Past service costs — (33,244 ) Defined benefits paid by the fund (5,105,669 ) (4,892,767 ) Actuarial (gains) losses in other comprehensive results due to: Change in financial assumptions 47,182,448 (149,533,263 ) Change in demographic assumptions (70,012,604 ) 4,842,109 For experience during the year 10,272,231 36,103,857 In plan assets during the year (453,206 ) 285,123 Remeasurements 26,417 (1,742 ) Contributions paid to the fund (51,952,560 ) (55,693,256 ) Defined benefit liabilities at end of year Ps. 1,241,072,307 Ps. 1,202,624,665 In 2017 and 2016, the net actuarial gains recognized in other comprehensive income (loss) net of income deferred tax were Ps. (12,038,710) and Ps. (106,387,640), respectively, related to retirement and post-employment benefits, not including the normal year to year increase in obligations based on changes in population, age, seniority, wages, pensions and benefits. The decrease in losses in 2017 was mainly due to the decrease in the discount and return on plan assets rates, from 8.17% in 2016 to 7.89% in 2017. December 31, Changes in pension plan assets 2017 2016 Plan assets at the beginning of year Ps. 9,489,666 Ps. 5,228,909 Return on plan assets 902,550 742,477 Payments by the pension fund (54,312,270 ) (51,889,821 ) Company contributions to the fund (1) 51,952,559 55,693,256 Actuarial (gains) losses in plan assets 453,187 (285,155 ) Pension plan assets at the end of year Ps. 8,485,692 Ps. 9,489,666 (1) Includes proceeds from the collected amounts of the Promissory Notes, contributed by the Mexican Government (See Note 14).
Summary of Amounts and Types of Plan Assets	As of December 31, 2017 and 2016, the amounts and types of plan assets are as follows: December 31, Plan Assets 2017 2016 Cash and cash equivalents Ps. 135,757 Ps. 5,906,660 Equity instruments 1,034,178 2,694,291 Debt instruments 7,315,757 888,715 Total plan assets Ps. 8,485,692 Ps. 9,489,666 December 31, Changes in Defined Benefit Obligations (DBO) 2017 2016 Defined benefit obligations at the beginning of the year Ps. 1,212,114,331 Ps. 1,263,708,928 Service costs 19,762,661 23,107,851 Financing costs 96,331,015 91,270,383 Past service costs (33,244 ) Payments by the fund (59,417,940 ) (56,778,359 ) Amount of (gains) and losses recognized through other comprehensive income: (12,594,541 ) (108,589,515 ) Modifications to the pension plan (6,609,657 ) (571,713 ) Remeasurements (1,471 ) — Reductions (26,399 ) — Defined benefit obligations at the end of year Ps. 1,249,557,999 Ps. 1,212,114,331
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, 2017 and 2016: Fair value measurements as of December 31, 2017 Plan assets Quoted prices Significant Significant Total Cash and cash equivalents Ps. 135,757 Ps. — Ps. — Ps. 135,757 Equity instruments 1,034,178 — — 1,034,178 Debt instruments 7,315,757 — — 7,315,757 Total Ps. 8,485,692 Ps. — Ps. — Ps. 8,485,692 Fair value measurements as of December 31, 2016 Plan assets: Quoted prices Significant Significant Total Cash and cash equivalents Ps. 5,906,660 Ps. — Ps. — Ps. 5,906,660 Equity instruments 2,694,291 — — 2,694,291 Debt instruments 888,715 — — 888,715 Total Ps. 9,489,666 Ps. — Ps. — Ps. 9,489,666
Summary of Principal Actuarial Assumptions Used in Determining the Defined Benefit Obligation	The principal actuarial assumptions used in determining the defined benefit obligation for the plans are as follows: December 31, 2017 2016 Rate of increase in salaries 4.77 % 4.77 % Inflation assumption 3.75 % 3.75 % Discount and return on plan assets rate 7.89 % 8.17 % Average length of obligation (years) 18.40 17.67
Actuarial assumption of expected rates of salary increases [member]
Summary of Principal Actuarial Assumptions Used in Determining the Defined Benefit Obligation	As of December 31, 2017 and 2016, the principal actuarial assumptions used in determining the defined benefit obligation for the plans are as follows: December 31, 2017 2016 Rate of increase in salaries 4.77 % 4.77 % Rate of increase in pensions 3.75 % 3.75 % Rate of increase in medical services 7.65 % 7.65 % Inflation assumption 3.75 % 3.75 % Discount and return on plan assets rate 7.89 % 8.17 % Average length of obligation (years) 18.40 17.67
Other Long-term Benefits [member]
Summary of Amounts Recognized for Long-term Obligations	The amounts recognized for long-term obligations for the years ended December 31, 2017 and 2016 are as follows: December 31, Change in the liability for defined benefits 2017 2016 Liabilities defined benefit at the beginning of year Ps. 17,784,771 Ps. 20,905,422 Charge to income for the year 3,277,847 3,420,158 Actuarial (gains) losses recognized in income due to: Change in financial assumptions 878,516 (3,028,211 ) Change in demographic assumptions (1,015,274 ) (119,982 ) For experience during the year (3,558,599 ) (3,390,396 ) Benefits paid (3,446 ) (2,220 ) Liabilities defined benefit at the end of year Ps. 17,363,815 Ps. 17,784,771

Provisions for Sundry Credito48

Provisions for Sundry Creditors (Tables)	12 Months Ended
	Dec. 31, 2017
Text block1 [abstract]
Summary of Provisions for Sundry Creditors and Others	At December 31, 2017 and 2016, the provisions for sundry creditors and others is as follows: 2017 2016 Provision for plugging of wells (Note 12) Ps. 68,797,600 Ps. 64,967,710 Provision for trails in process (Note 25) 7,812,689 15,119,692 Provision for environmental costs 11,067,134 8,230,476 Ps. 87,677,423 Ps. 88,317,878
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 2017 2016 Balance at the beginning of the year Ps. 64,967,710 Ps. 56,894,695 Decrease capitalized in fixed assets (3,791,482 ) (3,878,503 ) Unwinding of discount against income 7,774,000 11,968,966 Amount used (152,628 ) (17,448 ) Balance at the end of the year Ps. 68,797,600 Ps. 64,967,710 Trials in progress 2017 2016 Balance at the beginning of the year Ps. 15,119,692 Ps. 12,775,263 Additions against income 2,835,357 3,049,202 Provision cancellation (1,973,153 ) (632,806 ) Amount used (8,169,207 ) (71,967 ) Balance at the end of the year Ps. 7,812,689 Ps. 15,119,692 Environmental costs 2017 2016 Balance at the beginning of the year Ps. 8,230,476 Ps. 3,521,838 Additions against income 3,203,982 6,118,454 Provision cancellation (312,937 ) (1,347,285 ) Amount used (54,387 ) (62,531 ) Balance at the end of the year (1) Ps. 11,067,134 Ps. 8,230,476 (1) PEMEX is subject to the provisions of the Ley General del Equilibrio Ecológico y la Protección al Ambiente Procuraduría Federal de Protección al Ambiente

Disclosures of Cash Flow (Table

Disclosures of Cash Flow (Tables)	12 Months Ended
	Dec. 31, 2017
Text block1 [abstract]
Summary of Non-cash Transactions and are Presented for Disclosure Purposes	The following items represent non-cash For the years ended December 31, 2017 2016 2015 Operating activities Employee benefits equity effect (i) Ps. 12,038,710 Ps. 106,277,761 Ps. 78,556,569 Net (benefits) cost of the year for employee benefits (i) 108,073,074 109,738,416 (62,549,142 ) Investing activities (ii) Available-for-sale 5,564,130 207,817 (3,206,316 ) Financing activities Financed Public Works Contracts — 146,217,292 2,001,093 Currency translation effect (7,597,283 ) 21,386,902 13,262,101 Accrued interest 8,734,131 9,326,945 4,816,784 (i) Items that do not impact cash flows but that reflect the actuarial valuation at the end of the year. (ii) Non-cash investing transactions are included in Note 12-d.

Income Taxes and Federal Duti50

Income Taxes and Federal Duties (Tables)	12 Months Ended
	Dec. 31, 2017
Text block1 [abstract]
Summary of Total DUC and Others	Total DUC and other as of December 31, 2017 and 2016 are integrated as follows: 2017 2016 DUC Ps. 372,902,629 Ps. 304,299,019 DUC from prior years 2,095,429 — Other 260,775 514,356 Deferred DUC benefit (37,214,624 ) (27,651,571 ) Total DUC and other Ps. 338,044,209 Ps. 277,161,804
Summary of Principal Factors Generating the Deferred DUC	The principal factors generating the deferred DUC are the following: 2017 2016 Deferred DUC asset: Provisions Ps. 541,360,940 Ps. 570,544,863 Total deferred DUC asset 541,360,940 570,544,863 Deferred Profit-sharing duty liability: Wells, pipelines, properties, plant and equipment (455,697,786 ) (473,406,721 ) Deferred DUC liability (455,697,786 ) (473,406,721 ) Deferred asset net 85,663,154 97,138,142 Valuation reserve (1) (20,796,959 ) (69,486,571 ) Net, deferred DUC asset Ps. 64,866,195 Ps. 27,651,571 (1)   PEMEX added to its valuation reserve since it estimates that some allowed deductions will not materialize in future years.
Summary of Expected Benefit for DUC	The expected expense for DUC is different from that which would result from applying the 65% rate to the tax base, as a result of the items mentioned below: 2017 2016 Expected expense: Ps. 127,436,912 Ps. 159,897,683 Increase (decrease) resulting from: Non-cumulative (514,780,219 ) (423,761,673 ) Non-deductible 387,343,306 263,863,990 Production value 518,433,469 441,655,000 Deductible duties (39,503,110 ) (29,918,201 ) Deferred DUC reserve (48,689,612 ) 69,486,571 Deductions cap (94,552,741 ) (204,575,922 ) DUC from prior years 2,095,429 — Other 260,775 514,356 DUC-Profit-sharing Ps. 338,044,209 Ps. 277,161,804
Summary of Income Tax Expense (Benefit)	For the years ended December 31, 2017, 2016 and 2015, Petroleos Mexicanos and its Subsidiary Companies incurred the following income tax expense (benefit): 2017 2016 2015 Current income tax Ps. 3,546,912 Ps. 6,201,842 Ps. 7,426,892 Deferred income tax (9,334,064 ) (18,842,211 ) (53,014,159 ) Total Ps. (5,787,152 ) Ps. (12,640,369 ) Ps. (45,587,267 ) Income tax REFIPRE (Preferent Fiscal Regime) Ps. 722,984 Ps. — Ps. —
Summary of Principal Factors Generating Deferred Income Tax	The principal factors generating the deferred income tax are the following: 2016 Recognized in profit and loss Recognized in OCI 2017 Deferred income tax asset: Provisions Ps. 5,906,581 Ps. 2,393,237 Ps. — Ps. 8,299,818 Employee benefits provision 125,973,332 4,902,275 (800,284 ) 130,075,323 Advance payments from clients 1,046,010 1,728,296 — 2,774,306 Accrued liabilities 2,269,561 (1,897,574 ) — 371,987 Non-recoverable accounts receivable 778,179 (38,431 ) — 739,748 Derivative financial instruments 223,518 (144,263 ) — 79,255 Wells, pipelines, properties and equipment 458,273,897 (52,834,079 ) — 405,439,818 Tax loss carryforwards (1) 43,327,737 (9,216,777 ) — 34,110,960 Total deferred income tax asset 637,798,815 (55,107,316 ) (800,284 ) 581,891,215 Valuation reserve (2) (565,125,697 ) 64,560,772 — (500,564,925 ) Net deferred income tax asset 72,673,118 9,453,456 (800,284 ) 81,326,290 Deferred income tax liability: Wells, pipelines, properties, plant and equipment (3,632,294 ) 188,676 — (3,443,618 ) Other (502,242 ) (308,068 ) — (810,310 ) Total deferred income tax liability (4,134,536 ) (119,392 ) — (4,253,928 ) Net long-term deferred income tax liability Ps. 68,538,582 Ps. 9,334,064 Ps. (800,284 ) Ps. 77,072,362 2015 Recognized in profit and loss Recognized in OCI and equity (3) 2016 Deferred income tax asset: Provisions Ps. 25,414,822 Ps. (19,508,241 ) Ps. — Ps. 5,906,581 Employee benefits provision 247,834,882 (119,837,137 ) (2,024,413 ) 125,973,332 Advance payments from clients 1,015,357 30,653 — 1,046,010 Accrued liabilities 1,514 2,268,047 — 2,269,561 Non-recoverable accounts receivable 104,346 673,833 — 778,179 Derivative financial instruments 22,506 201,012 — 223,518 Wells, pipelines, properties and equipment 446,970,333 11,303,564 — 458,273,897 Tax loss carryforwards (1) 14,894,231 28,433,506 — 43,327,737 Total deferred income tax asset 736,257,991 (96,434,763 ) (2,024,413 ) 637,798,815 Valuation reserve (2) (681,357,607 ) 116,231,910 — (565,125,697 ) Net deferred income tax asset 54,900,384 19,797,147 (2,024,413 ) 72,673,118 Deferred income tax liability: Wells, pipelines, properties, plant and equipment (1,909,529 ) (726,999 ) (995,766 ) (3,632,294 ) Other (274,305 ) (227,937 ) — (502,242 ) Total deferred income tax liability (2,183,834 ) (954,936 ) (995,766 ) (4,134,536 ) Net long-term deferred income tax liability Ps. 52,716,550 Ps. 18,842,211 Ps. (3,020,179 ) Ps. 68,538,582 (1) Tax loss carryforwards expire in 2027. (2) Due to PEMEX’s estimate that not enough taxable income will be generated in future periods, a valuation reserve was recognized to account for the deferred income tax asset. (3) Includes effects from business combination in equity of Ps. (995,766).
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, 2017 2016 2015 Expected income tax expense Ps. (20,055,588 ) Ps. (14,901,324 ) Ps. (3,089,241 ) Increase (decrease) resulting from: Tax effect of inflation-net 14,302,118 8,098,213 (1,618,327 ) Difference between accounting and tax depreciation (3,713,920 ) (1,765,183 ) (107,231 ) Non-deductible 1,954,659 1,558,120 (1,921,515 ) Others-net (1,725,579 ) (5,630,195 ) (38,850,953 ) Income tax expense Ps. (5,787,152 ) Ps. (12,640,369 ) Ps. (45,587,267 )

Equity (Deficit), Net (Tables)

Equity (Deficit), Net (Tables)	12 Months Ended
	Dec. 31, 2017
Text block1 [abstract]
Summary of Permanent Equity	PEMEX’s permanent equity is as follows: Amount Certificates of Contribution “A” as of December 31, 2015 Ps. 194,604,835 Increase in Certificates of Contribution “A” during 2016 161,939,612 Certificates of Contribution “A” as of December 31, 2016 356,544,447 Increase in Certificates of Contribution “A” during 2017 — Certificates of Contribution “A” as of December 31, 2017 Ps. 356,544,447

Oher Revenues and Expenses - 52

Oher Revenues and Expenses - Net (Tables)	12 Months Ended
	Dec. 31, 2017
Text block1 [abstract]
Summary of Other Revenues and Expenses, net	Other revenues and expenses-net 2017 2016 2015 Revenues: Claims recovery Ps. 16,386,250 Ps. 3,695,217 Ps. 1,975,281 Fiscal support (Profit-sharing duty) (see Note 20a.) — 28,439,379 — Other income for services 4,720,546 4,266,854 3,953,888 Price of sale share (see Note 11-iii) 3,139,103 22,684,736 — Other 4,277,207 14,228,801 6,992,954 Revenues from reinsurance premiums 1,986,568 3,694,026 1,497,779 Franchise fees 917,934 1,059,333 1,148,528 Bidding terms, sanctions, penalties and other 825,956 3,223,437 1,262,458 Gain on sale of fixed assets — 2,687,652 — Assets value transferred to CENAGAS — 7,450,931 — Negative IEPS — — 2,519,126 Total other revenues 32,253,564 91,430,366 19,350,014 Expenses: Loss in the Assets value transferred to CENAGAS — (35,333,411 ) — Disposal of assets (8,447,031 ) (2,140,943 ) (3,364,063 ) Transportation and distribution of natural gas (6,652,878 ) (8,830,967 ) (369,317 ) Other (7,927,150 ) (3,581,036 ) (726,589 ) Claims (3,640,036 ) (4,757,116 ) (12,527,548 ) Loss in the sale of associates (412,393 ) (7,473,698 ) — Impairment of goodwill — (4,007,018 ) — Services provided — (2,656,571 ) (3,237,984 ) Total other expenses (27,079,488 ) (68,780,760 ) (20,225,501 ) Other revenues and expenses-net Ps. 5,174,076 Ps. 22,649,606 Ps. (875,487 )

Related Parties (Tables)

Related Parties (Tables)	12 Months Ended
	Dec. 31, 2017
Text block1 [abstract]
Summary of Ownership Interests	Company Name Ownership share Servicio Cozumel, S. A. de C. V. (which operates a retail service station) Mr. Pedro Joaquín Coldwell (1) 60 % Mr. Pedro Oscar Joaquín Delbouis (son of Mr. Joaquín Coldwell) 20 % Mr. Nassim Joaquín Delbouis (son of Mr. Joaquín Coldwell) 20 % Planta de Combustible Cozumel, S. A. de C. V. (which operates as a wholesale distributor) Fideicomiso Testamentario (2) 57 % Mr. Pedro Joaquín Coldwell (1) 40 % Gasolinera y Servicios Juárez, S. A. de C. V. (which operates a retail service station) Mr. Pedro Joaquín Coldwell (1) 40 % Fideicomiso Testamentario (3) 40 % Mr. Ignacio Nassim Ruiz Joaquín (nephew of Mr. Joaquín Coldwell) 20 % Combustibles Caleta, S. A. de C. V. (which operates a retail service station) Mr. Pedro Joaquín Coldwell (1) 20 % Mr. Pedro Oscar Joaquín Delbouis 20 % Mr. Nassim Joaquín Delbouis 20 % Fideicomiso Testamentario (4) 20 % Mr. Ignacio Nassim Ruiz Joaquín 20 % Combustibles San Miguel, S. A. de C. V. (which operates a retail service station) Mr. Pedro Joaquín Coldwell (1) 25 % Mr. Pedro Oscar Joaquín Delbouis 25 % Mr. Nassim Joaquín Delbouis 25 % Mr. Ignacio Nassim Ruiz Joaquín 25 % (1) In November, 2017, Mr. Pedro Joaquín Coldwell transmitted all of his shares in these companies to a management and investment trust held at Banco Mercantil del Norte, S.A., Institución de Banca Múltiple, Grupo Financiero Banorte. (2) 60% of these shares were owned by Fausto Nassim Joaquín Ibarra (father of Pedro Joaquín Coldwell), until his death in June of 2016, after which 57% of these shares became property of an investment, management and testamentary revocable trust, which is referred to as the Testamentary Trust. 50% of the voting rights of these shares are currently exercised by Mr. Pedro Oscar Joaquín Delbouis, and 50% are exercised by Mr. Nassim Joaquín Delbouis. (3) 40% of these shares were owned by Fausto Nassim Joaquín Ibarra until his death in June of 2016, after which these shares became property of the Testamentary Trust. 100% of the voting rights of these shares are currently exercised by Mr. Pedro Joaquín Coldwell. (4) 20% of these shares were owned by Fausto Nassim Joaquín Ibarra until his death in June of 2016, after which these shares became property of the Testamentary Trust. 50% of the voting rights of these shares are currently exercised by Mr. Pedro Oscar Joaquín Delbouis, and 50% are exercised by Mr. Nassim Joaquín Delbouis.

Commitments (Tables)

Commitments (Tables)	12 Months Ended
	Dec. 31, 2017
Estimated Future Payments Under Contract	Estimated future payments under this contract for upcoming fiscal years are as follows: 2018 Ps. 773,047 2019 783,197 2020 785,670 2021 786,323 2022 782,584 2023 and thereafter 3,595,798 Total Ps. 7,506,619
Estimated Value of Contracts	As of December 31, 2017 and 2016, the estimated value of these contracts was as follows: Maturity 2017 2016 Up to 1 year Ps. 5,533,174 Ps. 7,366,247 1 to 3 years 1,891,557 2,518,207 4 to 5 years 1,856,006 2,470,878 More than 5 years 3,123,173 4,157,843 Total Ps. 12,403,910 Ps. 16,513,175
Development Expenditure [member]
Estimated Value of Contracts	e. As of December 31, 2017 and 2016, 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 2017 2016 Up to 1 year Ps. 229,738,368 Ps. 347,606,848 1 to 3 years 196,335,411 281,563,607 4 to 5 years 123,159,215 69,541,826 More than 5 years 149,672,236 119,281,849 Total Ps. 698,905,230 Ps. 817,994,130

Business Combination (Tables)

Business Combination (Tables)	12 Months Ended
	Dec. 31, 2017
Text block1 [abstract]
Net Fair Value of Assets and Liabilities at Acquisition Date	The net fair value of Fertinal’s assets and liabilities as of the date of acquisition is: Fair value Cash and cash equivalents Ps. (6,943 ) Accounts receivable 102,121 Inventories 762,254 Properties, plant and equipment 9,811,928 Other assets 1,671,718 Total assets 12,341,078 Accounts payable Ps. 2,331,540 Debt 9,365,152 Deferred taxes 328,578 Total liabilities 12,025,270 Total assets, net Ps. 315,808 Transaction value Ps. 4,322,826 Goodwill Ps. 4,007,018

Subsidiary Guarantor Informat56

Subsidiary Guarantor Information (Tables)	12 Months Ended
	Dec. 31, 2017
Text block1 [abstract]
Summary of Principal Amount Outstanding of Registered Debt Securities	The following table sets forth, as of December 31, 2017, 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 obligor Guarantors Principal outstanding 5.75% Guaranteed Notes due 2018 Petróleos Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services 834,688 6.625% Guaranteed Bonds due 2035 Petróleos Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services 1,750,000 6.625% Guaranteed Bonds due 2038 Petróleos Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services 491,175 8.625% Bonds due 2022 Petróleos Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services 160,245 8.625% Guaranteed Bonds due 2023 Petróleos Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services 106,507 9 1 4 Petróleos Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services 107,109 9.50% Guaranteed Bonds due 2027 Petróleos Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services 219,217 The following table sets forth, as of December 31, 2017, the principal amount outstanding of the registered debt securities issued by Petróleos Mexicanos, and guaranteed by Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services. Table 2: Registered Debt Securities originally issued by Petróleos Mexicanos Security Issuer Guarantors Principal amount outstanding (U.S. $) 8.00% Notes due 2019 Petróleos Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services 1,312,015 9 1 4 Petróleos Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services 9,296 9.50% Global Guaranteed Bonds due 2027 Petróleos Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services 102,149 3.500% Notes due 2018 Petróleos Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services 355,356 Floating Rate Notes due 2018 Petróleos Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services 498,570 6.000% Notes due 2020 Petróleos Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services 995,364 5.50% Notes due 2021 Petróleos Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services 2,962,047 3.500% Notes due 2023 Petróleos Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services 2,099,730 4.875% Notes due 2024 Petróleos Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services 1,499,136 6.625% Notes due 2035 Petróleos Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services 999,000 6.500% Bonds due 2041 Petróleos Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services 3,000,000 4.875% Bonds 2022 Petróleos Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services 2,097,055 3.125% Notes due 2019 Petróleos Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services 325,778 3.500% Notes due 2020 Petróleos Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services 1,465,367 5.50% Bonds due 2044 Petróleos Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services 2,657,962 6.375% Bonds due en 2045 Petróleos Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services 2,999,980 5.625% Bonds due 2046 Petróleos Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services 2,996,226 4.500% Notes due 2026 Petróleos Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services 1,489,718 4.250% Notes due 2025 Petróleos Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services 998,435 5.500% Notes due 2019 Petróleos Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services 740,851 6.375% Notes due 2021 Petróleos Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services 1,247,668 6.875% Notes due 2026 Petróleos Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services 2,970,334 4.625% Notes due 2023 Petróleos Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services 2,055,498 6.750% Notes due 2047 Petróleos Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services 3,671,628
Supplemental Statement of Financial Position	SUPPLEMENTAL CONDENSED CONSOLIDATING FINANCIAL INFORMATION STATEMENT OF FINANCIAL POSITION As of December 31, 2017 Petróleos Mexicanos Subsidiary guarantors Non-guarantor subsidiaries Eliminations PEMEX consolidated Assets Current assets Cash and cash equivalents Ps. 46,959,103 Ps. 18,815,345 Ps. 32,077,306 Ps. — Ps. 97,851,754 Accounts receivable and other, net, and derivative financial instruments 83,119,394 38,105,354 79,533,940 — 200,758,688 Accounts receivable—inter-company 311,148,593 1,380,100,592 86,354,837 (1,777,604,022 ) — Inventories 509,375 32,357,125 30,992,430 — 63,858,930 Available-for-sale — — 1,056,918 — 1,056,918 Total current assets 441,736,465 1,469,378,416 230,015,431 (1,777,604,022 ) 363,526,290 Long-term receivables—intercompany 1,823,276,758 285 3,597,880 (1,826,874,923 ) — Investments in joint ventures and associates (465,832,399 ) 82,668 16,611,681 465,845,414 16,707,364 Wells, pipelines, properties, plant and equipment-net 12,444,376 1,370,974,060 53,090,890 — 1,436,509,326 Long-term notes receivables 147,286,367 1,206,542 — — 148,492,909 Deferred taxes 59,691,528 84,443,897 2,057,060 — 146,192,485 Intangible assets — 9,088,563 — — 9,088,563 Other assets 2,209,579 4,846,078 4,429,520 — 11,485,177 Total assets Ps. 2,020,812,674 Ps. 2,940,020,509 Ps. 309,802,462 Ps. (3,138,633,531 ) Ps. 2,132,002,114 Liabilities Current liabilities Current portion of long-term debt Ps. 137,947,110 Ps. 5,386,564 Ps. 13,875,793 Ps. — Ps. 157,209,467 Accounts payable—inter-company 1,240,490,891 434,556,688 93,140,905 (1,768,188,484 ) — Other current liabilities 23,435,614 157,589,107 50,892,997 — 231,917,718 Total current liabilities 1,401,873,615 597,532,359 157,909,695 (1,768,188,484 ) 389,127,185 Long-term debt 1,824,829,579 40,262,391 15,573,634 — 1,880,665,604 Long-term payables—inter-company — 1,830,150,615 6,139,845 (1,836,290,460 ) — Employee benefits, provisions for sundry creditors, other liabilities and deferred taxes 297,028,436 1,057,191,286 10,341,988 — 1,364,561,710 Total liabilities 3,523,731,630 3,525,136,651 189,965,162 (3,604,478,944 ) 3,634,354,499 Equity (deficit), net (1,502,918,956 ) (585,116,142 ) 119,837,300 465,845,413 (1,502,352,385 ) Total liabilities and equity Ps. 2,020,812,674 Ps. 2,940,020,509 Ps. 309,802,462 Ps. (3,138,633,531 ) Ps. 2,132,002,114 SUPPLEMENTAL CONDENSED CONSOLIDATING FINANCIAL INFORMATION STATEMENT OF FINANCIAL POSITION As of December 31, 2016 Petróleos Mexicanos Subsidiary guarantors Non-guarantor subsidiaries Eliminations PEMEX consolidated Assets Current assets Cash and cash equivalents Ps. 92,503,607 Ps. 9,732,503 Ps. 61,296,403 Ps. — Ps. 163,532,513 Accounts receivable and other, net, and derivative financial instruments 6,604,595 75,760,079 55,713,323 — 138,077,997 Accounts receivable—inter-company 440,645,367 1,684,782,235 70,268,246 (2,195,695,848 ) — Inventories 446,954 29,270,943 16,174,163 — 45,892,060 Available-for-sale — — 2,852,679 — 2,852,679 Held-for-sale non-financial — 7,460,674 — — 7,460,674 Total current assets 540,200,523 1,807,006,434 206,304,814 (2,195,695,848 ) 357,815,923 Available-for-sale — — 6,027,540 — 6,027,540 Long-term receivables—intercompany 1,740,519,399 289 6,384,944 (1,746,904,632 ) — Investments in joint ventures and associates (250,108,630 ) 396,681 20,327,813 250,121,645 20,737,509 Wells, pipelines, properties, plant and equipment-net 12,596,722 1,595,655,580 59,489,946 — 1,667,742,248 Long-term notes receivables 140,579,974 8,027,628 — — 148,607,602 Deferred taxes 59,162,878 40,341,615 820,196 — 100,324,689 Restricted cash — 9,624,804 853,822 — 10,478,626 Intangible assets — 8,639,242 — — 8,639,242 Other assets 1,824,104 2,707,788 4,980,753 — 9,512,645 Total assets Ps. 2,244,774,970 Ps. 3,472,400,061 Ps. 305,189,828 Ps. (3,692,478,835 ) Ps. 2,329,886,024 Liabilities Current liabilities Current portion of long-term debt 157,937,631 7,381,095 10,847,462 — 176,166,188 Accounts payable—inter-company 1,265,244,986 854,106,939 68,510,835 (2,187,862,760 ) — Other current liabilities 34,913,773 169,182,239 45,927,686 — 250,023,698 Total current liabilities 1,458,096,390 1,030,670,273 125,285,983 (2,187,862,760 ) 426,189,886 Long-term debt 1,737,332,174 46,090,919 23,581,449 — 1,807,004,542 Long-term payables—inter-company — 1,746,433,870 8,303,850 (1,754,737,720 ) — Employee benefits, provisions for sundry creditors, other liabilities and deferred taxes 282,902,667 1,035,019,339 11,777,737 — 1,329,699,743 Total liabilities 3,478,331,231 3,858,214,401 168,949,019 (3,942,600,480 ) 3,562,894,171 Equity (deficit), net (1,233,556,261 ) (385,814,340 ) 136,240,809 250,121,645 (1,233,008,147 ) Total liabilities and equity Ps. 2,244,774,970 Ps. 3,472,400,061 Ps. 305,189,828 Ps. (3,692,478,835 ) Ps. 2,329,886,024
Supplemental Statement of Comprehensive Income	SUPPLEMENTAL CONDENSED CONSOLIDATING FINANCIAL INFORMATION STATEMENT OF COMPREHENSIVE INCOME For the year ended December 31, 2017 Petróleos Mexicanos Subsidiary Non-guarantor Eliminations PEMEX consolidated Net sales Ps. — Ps. 1,713,914,703 Ps. 1,096,752,930 Ps. (1,424,768,483 ) Ps. 1,385,899,150 Services income 50,399,983 140,934,022 2,646,144 (182,849,580 ) 11,130,569 Total sales revenues 50,399,983 1,854,848,725 1,099,399,074 (1,607,618,063 ) 1,397,029,719 Impairment of wells, pipelines, properties, plant and equipment — 145,302,407 6,142,153 — 151,444,560 Cost of sales 2,007,814 1,447,640,131 1,083,297,610 (1,528,740,675 ) 1,004,204,880 Gross income 48,392,169 261,906,187 9,959,311 (78,877,388 ) 241,380,279 Other revenues (expenses), net (341,521 ) (12,443,660 ) (4,664,096 ) 22,623,353 5,174,076 General expenses: Transportation, distribution and sale expenses — 26,136,674 1,297,558 (5,544,562 ) 21,889,670 Administrative expenses 59,141,391 105,920,390 5,883,200 (51,005,527 ) 119,939,454 Total general expenses 59,141,391 132,057,064 7,180,758 (56,550,089 ) 141,829,124 Operating income (11,090,743 ) 117,405,463 (1,885,543 ) 296,054 104,725,231 Financing income 143,676,367 134,401,598 3,185,195 (265,097,307 ) 16,165,853 Financing cost (236,929,035 ) (141,900,236 ) (3,616,530 ) 264,801,253 (117,644,548 ) Derivative financial instruments income (cost), net 27,670,991 (1,608,039 ) (724,628 ) — 25,338,324 Foreign exchange income , net 6,837,171 15,807,988 538,963 — 23,184,122 Profit (loss) sharing in joint ventures and associates (211,567,169 ) 409,955 (49,515 ) 211,567,169 360,440 Income (loss) before taxes, duties and other (281,402,418 ) 124,516,729 (2,552,058 ) 211,567,169 52,129,422 Total taxes, duties and other (557,520 ) 331,001,261 2,536,300 — 332,980,041 Net (loss) income for the year (280,844,898 ) (206,484,532 ) (5,088,358 ) 211,567,169 (280,850,619 ) Total other comprehensive result 4,728,640 6,841,586 (63,845 ) — 11,506,381 Total comprehensive result for the year Ps. (276,116,258 ) Ps. (199,642,946 ) Ps. (5,152,203 ) Ps. 211,567,169 Ps. (269,344,238 ) SUPPLEMENTAL CONDENSED CONSOLIDATING FINANCIAL INFORMATION STATEMENT OF COMPREHENSIVE INCOME For the year ended December 31, 2016 Petróleos Mexicanos Subsidiary Non-guarantor Eliminations PEMEX consolidated Net sales Ps. — Ps. 1,361,538,624 Ps. 828,143,332 Ps. (1,124,563,366 ) Ps. 1,065,118,590 Services income 46,330,245 98,959,131 1,970,055 (138,284,789 ) 8,974,642 Total sales revenues 46,330,245 1,460,497,755 830,113,387 (1,262,848,155 ) 1,074,093,232 (Reversal) impairment of wells, pipelines, properties, plant and equipment — (330,037,834 ) (1,276,509 ) — (331,314,343 ) Cost of sales 1,236,921 1,244,388,072 809,156,778 (1,188,959,550 ) 865,822,221 Gross income 45,093,324 546,147,517 22,233,118 (73,888,605 ) 539,585,354 Other revenues (expenses), net (312,611 ) 20,713,184 2,915,837 (666,804 ) 22,649,606 General expenses: Transportation, distribution and sale expenses — 50,948,771 945,489 (26,663,020 ) 25,231,240 Administrative expenses 57,437,455 96,884,031 7,050,271 (48,718,224 ) 112,653,533 Total general expenses 57,437,455 147,832,802 7,995,760 (75,381,244 ) 137,884,773 Operating income (12,656,742 ) 419,027,899 17,153,195 825,835 424,350,187 Financing income 123,266,281 67,542,768 3,526,378 (180,586,172 ) 13,749,255 Financing cost (160,824,632 ) (114,271,762 ) (3,602,868 ) 179,854,798 (98,844,464 ) Derivative financial instruments (cost) income, net (12,052,200 ) 3,172 (1,951,959 ) — (14,000,987 ) Foreign exchange loss, net (20,531,005 ) (232,714,446 ) (767,292 ) — (254,012,743 ) Profit (loss) sharing in joint ventures and associates (117,347,803 ) 628,357 1,507,488 117,347,803 2,135,845 Income (loss) before taxes, duties and other (200,146,101 ) 140,215,988 15,864,942 117,442,264 73,377,093 Total taxes, duties and other (8,834,626 ) 266,155,181 7,200,880 — 264,521,435 Net (loss) income for the year (191,311,475 ) (125,939,193 ) 8,664,062 117,442,264 (191,144,342 ) Total other comprehensive result 10,126,560 96,032,433 21,713,488 — 127,872,481 Total comprehensive result for the year Ps. (181,184,915 ) Ps. (29,906,760 ) Ps. 30,377,550 Ps. 117,442,264 Ps. (63,271,861 ) SUPPLEMENTAL CONDENSED CONSOLIDATING FINANCIAL INFORMATION STATEMENT OF COMPREHENSIVE INCOME For the year ended December 31, 2015 Petróleos Subsidiary guarantors Non-guarantor Eliminations PEMEX Net sales Ps. 15,556 Ps. 1,523,767,800 Ps. 803,623,324 Ps. (1,173,956,323 ) Ps. 1,153,450,357 Services income 16,897,139 16,815,589 2,585,617 (27,988,310 ) 8,310,035 Total sales revenues 16,912,695 1,540,583,389 806,208,941 (1,201,944,633 ) 1,161,760,392 Impairment of wells, pipelines, properties, plant and equipment — 476,276,159 1,668,531 — 477,944,690 Benefit from change in pension plan (83,657,496 ) (8,519,593 ) — (92,177,089 ) Cost of sales 2,695,423 1,280,404,059 791,147,745 (1,182,282,621 ) 891,964,606 Gross income 14,217,272 (132,439,333 ) 21,912,258 (19,662,012 ) (115,971,815 ) Other (expenses) revenues, net (19,805 ) (6,073,003 ) 3,326,421 1,890,900 (875,487 ) General expenses: Transportation, distribution and sale expenses — 32,870,908 2,921,430 (6,863,699 ) 28,928,639 Administrative expenses 59,923,878 52,832,029 10,638,127 (10,921,939 ) 112,472,095 Benefit from change in pension plan (46,031,780 ) (50,394,477 ) (7,434,698 ) — (103,860,955 ) Total general expenses 13,892,098 35,308,460 6,124,859 (17,785,638 ) 37,539,779 Operating income 305,369 (173,820,796 ) 19,113,820 14,526 (154,387,081 ) Financing income 108,543,665 28,639,034 3,478,434 (125,670,274 ) 14,990,859 Financing cost (85,544,060 ) (104,453,148 ) (3,306,776 ) 125,530,391 (67,773,593 ) Derivative financial instruments (cost) income, net (22,803,663 ) 6,463 1,347,323 — (21,449,877 ) Foreign exchange loss, net (14,829,436 ) (139,623,910 ) (312,228 ) — (154,765,574 ) (Loss) profit sharing in joint ventures and associates (749,963,960 ) 198,786 2,119,329 749,963,960 2,318,115 (Loss) income before taxes, duties and other (764,292,085 ) (389,053,571 ) 22,439,902 749,838,603 (381,067,151 ) Total taxes, duties and other (51,982,560 ) 376,649,369 6,833,438 — 331,500,247 Net (loss) income for the year (712,309,525 ) (765,702,940 ) 15,606,464 749,838,603 (712,567,398 ) Total other comprehensive result 10,980,787 56,585,790 21,045,777 — 88,612,354 Total comprehensive result for the year Ps. (701,328,738 ) Ps. (709,117,150 ) Ps. 36,652,241 Ps. 749,838,603 Ps. (623,955,044)
Supplemental Statement of Cash Flows	SUPPLEMENTAL CONDENSED CONSOLIDATING FINANCIAL INFORMATION STATEMENT OF CASH FLOWS For the year ended December 31, 2017 Petróleos Subsidiary Non-guarantor Eliminations PEMEX Operating activities: Net (loss) income for the year Ps. (280,844,898 ) Ps. (206,484,532 ) Ps. (5,082,639 ) Ps. 211,561,450 Ps. (280,850,619 ) Adjustments to reconcile net loss to cash provided by operating activities: Depreciation and amortization 1,155,881 152,607,943 2,940,689 — 156,704,513 Impairment of wells, pipelines, properties, plant and equipment — 145,302,407 6,142,153 — 151,444,560 Unsuccessful wells — 6,164,624 — — 6,164,624 Exploration costs — (1,447,761 ) — — (1,447,761 ) Disposal of wells, pipelines, properties, plant and equipment 433,391 14,687,229 1,943,051 — 17,063,671 Gain on sale of share in joint ventures and associates — (3,139,103 ) — — (3,139,103 ) Disposal of held—for—sale current non—financial assets — 2,808,360 — — 2,808,360 Dividends — — (180,675 ) — (180,675 ) Effects of net present value of reserve for well abandonment — 7,774,000 — — 7,774,000 Profit (loss) sharing in investments 211,567,169 (409,955 ) 49,515 (211,567,169 ) (360,440 ) Decrease on available—for-sale — — 1,360,205 — 1,360,205 Net loss on available-for-sale financial assets — — 3,523,748 — 3,523,748 Unrealized foreign exchange loss (gain) (13,526,153 ) (1,585,910 ) (1,573,376 ) — (16,685,439 ) Interest expense 100,545,114 15,736,420 1,363,014 — 117,644,548 Funds (used in) from operating activities: Accounts receivable, accounts payable and derivative financial instruments (88,496,967 ) (14,214,566 ) (20,789,692 ) — (123,501,225 ) Inventories (62,421 ) (3,086,181 ) (14,818,268 ) — (17,966,870 ) Other assets (7,091,867 ) (483,389 ) 551,233 — (7,024,023 ) Employee benefits 18,829,768 31,489,785 (254,157 ) — 50,065,396 Inter-company charges and deductions 7,284,124 (114,968,213 ) 514,270 107,169,819 — Cash flows (used in) from operating activities (50,206,859 ) 30,751,158 (24,310,929 ) 107,164,100 63,397,470 Investing activities: Acquisition of wells, pipelines, properties, plant and equipment (1,436,926 ) (87,274,561 ) (3,147,978 ) — (91,859,465 ) Resources from sale available-for-sale — — 8,026,836 — 8,026,836 Resources from sale of shares in associates — 3,863,072 (721,362 ) — 3,141,710 (Increase) decrease due to Inter-company investing 25,611,359 — — (25,611,359 ) — Cash flows used in investing activities 24,174,433 (83,411,489 ) 4,157,496 (25,611,359 ) (80,690,919 ) Financing activities: Loans obtained from financial institutions 401,947,349 — 302,768,119 — 704,715,468 Debt payments, principal only (327,703,729 ) (7,981,937 ) (306,374,153 ) — (642,059,819 ) Interest paid (93,755,698 ) (13,991,633 ) (1,163,086 ) — (108,910,417 ) Inter-company increase (decrease) financing — 83,716,743 (2,164,002 ) (81,552,741 ) — Cash flows provided by financing activities: (19,512,078 ) 61,743,173 (6,933,122 ) (81,552,741 ) (46,254,768 ) Net (decrease) increase in cash and cash equivalents (45,544,504 ) 9,082,842 (27,086,555 ) — (63,548,217 ) Effects of change in cash value — — (2,132,542 ) — (2,132,542 ) Cash and cash equivalents at the beginning of the year 92,503,607 9,732,503 61,296,403 — 163,532,513 Cash and cash equivalents at the end of the year Ps. 46,959,103 Ps. 18,815,345 Ps. 32,077,306 Ps. — Ps. 97,851,754 SUPPLEMENTAL CONDENSED CONSOLIDATING FINANCIAL INFORMATION STATEMENT OF CASH FLOWS For the year ended December 31, 2016 Petróleos Subsidiary Non-guarantor Eliminations PEMEX Operating activities: Net (loss) income for the year Ps. (191,311,476 ) Ps. (139,410,398 ) Ps. 22,160,755 Ps. 117,416,777 Ps. (191,144,342 ) Adjustments to reconcile net loss to cash provided by operating activities: Depreciation and amortization 1,066,033 146,545,307 2,828,151 — 150,439,491 (Reversal) impairment of wells, pipelines, properties, plant and equipment — (330,037,834 ) (1,276,509 ) — (331,314,343 ) Unsuccessful wells — 29,106,084 — — 29,106,084 Exploration costs — (2,022,826 ) — — (2,022,826 ) Disposal of wells, pipelines, properties, plant and equipment 320,599 2,658,625 792,063 — 3,771,287 Loss in sale of fixed assets — 27,882,480 — — 27,882,480 Gain on sale of share in joint ventures and associates — (15,211,039 ) — — (15,211,039 ) Profit (loss) sharing in joint ventures and associates 117,249,643 (628,356 ) (1,507,489 ) (117,249,643 ) (2,135,845 ) Impairment of goodwill — — 4,007,018 — 4,007,018 Dividends — — (293,397 ) — (293,397 ) Effects of net present value of reserve for well abandonment — 11,968,966 — — 11,968,966 Unrealized foreign exchange loss (gain) 231,191,646 6,754,046 5,237,072 — 243,182,764 Interest expense 91,044,541 5,687,502 2,112,421 — 98,844,464 Funds (used in) from operating activities: Accounts receivable, accounts payable and derivative financial instruments 23,636,331 (158,449,370 ) 45,028,534 — (89,784,505 ) Inventories 83,317 3,508,494 (4,950,690 ) — (1,358,879 ) Other assets (2,405,412 ) (22,600,504 ) (122,614 ) — (25,128,530 ) Employee benefits 2,591,000 136,354,337 (91,652,268 ) — 47,293,069 Inter-company charges and deductions (393,835,932 ) (83,049,125 ) 48,435,633 428,449,424 — Cash flows (used in) from operating activities (120,369,710 ) (380,943,611 ) 30,798,680 428,616,558 (41,898,083 ) Investing activities: Acquisition of wells, pipelines, properties, plant and equipment (2,172,586 ) (147,786,686 ) (1,449,208 ) — (151,408,480 ) Resources from sale on share in associates — 23,050,344 (365,608 ) — 22,684,736 Proceeds from the sale of fixed assets — 560,665 — — 560,665 Business acquisition — — (4,329,769 ) — (4,329,769 ) (Increase) decrease due to Inter-company investing (39,612,699 ) — — 39,612,699 — Cash flows used in investing activities (41,785,285 ) (124,175,677 ) (6,144,585 ) 39,612,699 (132,492,848 ) Financing activities: Increase in equity due to Certificates of Contributions “A” 73,500,000 — — — 73,500,000 Loans obtained from financial institutions 571,944,209 34,483,348 235,564,210 — 841,991,767 Debt payments, principal only (372,809,166 ) (6,414,441 ) (235,763,722 ) — (614,987,329 ) Interest paid (82,008,347 ) (4,706,946 ) (2,038,848 ) — (88,754,141 ) Inter-company increase (decrease) financing — 464,488,030 3,741227 (468,229,257 ) — Cash flows provided by financing activities: 190,626,696 487,849,991 1,502,867 (468,229,257 ) 211,750,297 Net (decrease) increase in cash and cash equivalents 28,471,701 (17,269,297 ) 26,156,962 — 37,359,366 Effects of change in cash value 5,570,892 20,371,126 (9,137,751 ) — 16,804,267 Cash and cash equivalents at the beginning of the year 58,461,014 6,630,674 44,277,192 — 109,368,880 Cash and cash equivalents at the end of the year Ps. 92,503,607 Ps. 9,732,503 Ps. 61,296,403 Ps. — Ps. 163,532,513 SUPPLEMENTAL CONDENSED CONSOLIDATING FINANCIAL INFORMATION STATEMENT OF CASH FLOWS For the year ended December 31, 2015 Petróleos Subsidiary Non-guarantor Eliminations PEMEX Operating activities: Net (loss) income for the year Ps. (712,177,124 ) Ps. (765,702,826 ) Ps. 15,738,868 Ps. 749,573,684 Ps. (712,567,398 ) Adjustments to reconcile net loss to cash provided by operating activities: Depreciation and amortization 789,657 164,221,429 2,940,164 — 167,951,250 Impairment of wells, pipelines, properties, plant and equipment — 476,276,159 1,668,531 — 477,944,690 Unsuccessful wells — 23,213,519 — — 23,213,519 Exploration costs — (5,698,511 ) — — (5,698,511 ) Disposal of wells, pipelines, properties, plant and equipment 180,992 21,945,266 2,512,279 — 24,638,537 Profit (loss) sharing in joint ventures and associates 749,963,958 (198,786 ) (2,119,329 ) (749,963,958 ) (2,318,115 ) Gain on sale of share in joint ventures and associates — (337,675 ) (342,955 ) — (680,630 ) Dividends — — (359,941 ) — (359,941 ) Effects of net present value of reserve for well abandonment — (608,160 ) — — (608,160 ) Unrealized foreign exchange loss (gain) 145,971,158 2,996,219 3,708,879 — 152,676,256 Interest expense 63,460,443 3,414,430 898,720 — 67,773,593 Funds provided by (used in) operating activities: Accounts receivable, accounts payable and derivative financial instruments (58,554,144 ) 119,761,648 (27,777,939 ) — 33,429,565 Inventories 108,568 4,547,843 1,511,317 — 6,167,728 Other assets (149,819 ) (16,578,827 ) 126,281 — (16,602,365 ) Employee benefits (10,037,444 ) (94,183,192 ) (11,801,596 ) — (116,022,232 ) Inter-company charges and deductions (310,384,820 ) 30,044,041 31,975,215 248,365,564 — Cash flows provided by operating activities (130,828,575 ) (36,887,423 ) 18,678,494 247,975,290 98,937,786 Investing activities: Acquisition of wells, pipelines, properties, plant and equipment (1,496,277 ) (239,315,507 ) (12,702,217 ) — (253,514,001 ) Investments in associates — — (36,214 ) — (36,214 ) Resources from the sales on share in associates — (130,323 ) 4,547,461 — 4,417,138 (Increase) decrease due to Inter-company investing (39,108,879 ) — — 39,108,879 — Cash flows used in investing activities (40,605,156 ) (239,445,830 ) (8,190,970 ) 39,108,879 (249,133,077 ) Financing activities: Increase in equity due to Certificates of Contributions “A” 10,000,000 (1,915,922 ) 1,844,394 71,528 10,000,000 Loans obtained from financial institutions 345,383,990 — 33,587,088 — 378,971,078 Debt payments, principal only (147,927,857 ) (8,081,177 ) (37,609,464 ) — (193,618,498 ) Interest paid (58,123,368 ) (3,443,923 ) (1,169,859 ) — (62,737,150 ) Inter-company increase (decrease) financing (3,626,448 ) 289,859,173 922,972 (287,155,697 ) — Cash flows provided by financing activities: 145,706,317 276,418,151 (2,424,869 ) (287,084,169 ) 132,615,430 Net (decrease) increase in cash and cash equivalents (25,727,414 ) 84,898 8,062,655 — (17,579,861 ) Effects of change in cash value 11,185,788 1,138,356 (3,363,931 ) — 8,960,213 Cash and cash equivalents at the beginning of the year 73,002,640 5,407,420 39,578,468 — 117,988,528 Cash and cash equivalents at the end of the year Ps. 58,461,014 Ps. 6,630,674 Ps. 44,277,192 Ps. — Ps. 109,368,880

Supplementary Information on 57

Supplementary Information on Oil and Gas Exploration And Production Activities (Unaudited) (Tables)	12 Months Ended
	Dec. 31, 2017
Text block1 [abstract]
Summary of Capitalized Costs for Oil and Gas Producing Activities	a. Capitalized costs for oil and gas producing activities (unaudited): As of December 31, 2017 2016 2015 Proved reserves Ps. 2,363,336,481 Ps. 2,476,535,503 Ps. 2,102,971,025 Construction in progress 35,381,089 60,720,261 88,706,330 Accumulated depreciation and amortization (1,444,962,317 ) (1,355,402,150 ) (1,224,690,867 ) Net capitalized costs Ps. 953,755,253 Ps. 1,181,853,614 Ps. 966,986,487
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): As of December 31, 2017 2016 Exploration Ps. 32,480,801 Ps. 41,661,666 Development 53,460,364 113,895,246 Total costs incurred Ps. 85,941,165 Ps. 155,556,912
Summary of Results of Operations for Oil and Gas Producing Activities	c. Results of operations for oil and gas producing activities (unaudited): 2017 2016 2015 Revenues from sale of oil and gas Ps. 762,637,362 Ps. 616,380,608 Ps. 690,591,455 Hydrocarbon duties 375,156,405 304,299,019 376,682,705 Production costs (excluding taxes) 248,957,950 171,194,337 177,774,082 Other costs and expenses (3,954,222 ) 61,359,271 20,360,540 Exploration expenses 14,993,433 39,693,273 31,244,564 Depreciation, depletion, amortization and accretion 240,672,906 (150,891,739 ) 527,014,056 875,826,472 425,654,161 1,133,075,947 Results of operations for oil and gas producing activities Ps. (113,189,111 ) Ps. 190,726,447 Ps. (442,484,491 )
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): 2017 2016 2015 Weighted average sales price per barrel of oil equivalent (boe) (1) US$ 38.63 US$ 29.18 US$ 37.17 Crude oil, per barrel 48.71 36.55 48.22 Natural gas, per thousand cubic feet 4.32 3.01 3.78 (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 Condensates (2) Dry Gas (3) (in millions of barrels) (in billions of cubic feet) Proved developed and un-developed Proved developed reserves 4,166 4,026 Proved undeveloped reserves 2,261 2,567 Total proved reserves 6,427 6,593 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) 2017 2016 2015 (in millions of barrels) Proved developed and undeveloped reserves: At December 31 7,219 7,977 10,292 Revisions (2) (95 ) 189 (1,491 ) Extensions and discoveries 147 (55 ) 111 Production (805 ) (891 ) (935 ) Farm outs & transfer of fields due to NHC bidding process (38 ) — — At December 31 6,427 7,219 7,977 Proved developed reserves at December 31 4,166 4,886 5,725 Proved undeveloped reserves at December 31 2,261 2,333 2,252 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 2017 2016 2015 (in billions of cubic feet) Proved developed and undeveloped reserves: At December 31 6,984 8,610 10,859 Revisions (1) 169 (183 ) (955 ) Extensions and discoveries 468 (308 ) 47 Production (2) (999 ) (1,134 ) (1,341 ) Farm outs & transfer of fields due to NHC bidding process (29 ) — — At December 31 6,593 6,984 8,610 Proved developed reserves at December 31 4,026 4,513 6,012 Proved undeveloped reserves at December 31 2,567 2,471 2,598 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 2017 2016 2015 (in millions of U.S. dollars) Future cash inflows US$ 269,489 US$ 228,196 US$ 325,052 Future production costs (excluding profit taxes) (114,369 ) (87,942 ) (99,948 ) Future development costs (26,229 ) (25,515 ) (32,560 ) Future cash flows before tax 128,891 114,738 192,544 Future production and excess gains taxes (129,377 ) (108,960 ) (167,056 ) Future net cash flows (487 ) 5,779 25,488 Effect of discounting net cash flows by 10% (4,600 ) (937 ) (9,946 ) Standardized measure of discounted future net cash flows US$ 4,113 US$ 4,841 US$ 15,541 Note: Table amounts may not total due to rounding.
Disclosure of Changes in Standardized Measure of Discounted Future Net Cash Flows	Changes in standardized measure of discounted future net cash flows 2017 2016 2015 (in millions of U.S. dollars) Sales of oil and gas produced, net of production costs US$ (25,076 ) US$ (19,411 ) US$ (28,371 ) Net changes in prices and production costs 26,355 (53,278 ) (327,865 ) Extensions and discoveries 3,639 1,105 3,086 Development cost incurred during the year 2,699 4,124 10,172 Changes in estimated development costs 2,744 1,763 (2,171 ) Reserves revisions and timing changes (1,353 ) 6,366 (22,801 ) Accretion of discount of pre-tax 5,891 11,094 43,394 Net changes in production and excess gains taxes (15,628 ) 37,537 295,437 Aggregate change in standardized measure of discounted future net cash flows US$ (728 ) US$ (10,700 ) US$ (29,119 ) Standardized measure: As of January 1 US$ 4,841 US$ 15,541 US$ 44,661 As of December 31 4,113 4,841 15,541 Change US$ (728 ) US$ (10,700 ) US$ (29,119 )

Structure and Business Operat58

Structure and Business Operations of Petroleos Mexicanos, Subsidiary Entities and Subsidiary Companies - Additional Information (Detail)	Dec. 31, 2017
Description of business and nature of operations [abstract]
Ownership percentage	100.00%

Basis of Preparation - Addition

Basis of Preparation - Additional Information (Detail) $ in Thousands, $ in Thousands	Nov. 03, 2017bbl	Oct. 05, 2017	Jul. 06, 2017	Dec. 31, 2017USD ($)Exchange_Rate	Dec. 31, 2017MXN ($)Exchange_Rate	Dec. 31, 2016MXN ($)Exchange_Rate	Dec. 31, 2015MXN ($)Exchange_Rate	Dec. 31, 2017MXN ($)	Nov. 17, 2016USD ($)	Nov. 17, 2016MXN ($)	Nov. 18, 2015USD ($)	Nov. 18, 2015MXN ($)
Disclosure of basis of preparation of financial statements [line items]
Unrecognized net losses						$ 191,144,342		$ 280,850,619
Negative equity amount						1,233,008,147		1,502,352,385
Working capital decreasing amount					$ 25,600,895	68,373,963
Net cash flows (used in) from operating activities				$ 3,204,044	$ 63,397,470	$ (41,898,083)	$ 98,937,786
Estimated reserve of oil equivalent | bbl	1,500,000,000
Percentage of volume available placed at market price			100.00%
Estimated maximum borrowings permissible under statute									$ 8,055,900	$ 150,000,000	$ 15,722,000	$ 240,550,000
Amount available under lines of credit				$ 6,700,000				23,500,000
Percentage of increase in annual budget				1.70%	1.70%
Employee benefits provision				35.00%	35.00%	34.00%
Bottom of range [member]
Disclosure of basis of preparation of financial statements [line items]
Market share percentage				65.00%	65.00%
Internal debt [member]
Disclosure of basis of preparation of financial statements [line items]
Estimated maximum borrowings permissible under statute								30,000,000
External debt [member]
Disclosure of basis of preparation of financial statements [line items]
Estimated maximum borrowings permissible under statute				$ 6,182,800
Pemex industrial transformation [member]
Disclosure of basis of preparation of financial statements [line items]
Percentage of interest held		50.00%
Foreign exchange rate | Exchange_Rate						20.6640	17.2065
Pemex Industrial Transformation TAG Norte Holding [member]
Disclosure of basis of preparation of financial statements [line items]
Percentage of indirect interest held		5.00%
Pemex exploration and production [member]
Disclosure of basis of preparation of financial statements [line items]
Foreign exchange rate | Exchange_Rate				19.7867	19.7867	20.6640	17.2065
3P reserves [member]
Disclosure of basis of preparation of financial statements [line items]
Estimated reserve of oil equivalent | bbl	350,000,000
2016 [member]
Disclosure of basis of preparation of financial statements [line items]
Indebtedness amount								231,618,067
Annual budget amount					$ 385,211,257
2017 [member]
Disclosure of basis of preparation of financial statements [line items]
Indebtedness amount								$ 72,412,672
Annual budget amount					$ 391,946,000

Significant Accounting Polici60

Significant Accounting Policies - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2017
Disclosure of significant accounting policies [line items]
Description of voting right	PEMEX owns directly or indirectly between 20% and 50% of voting rights in another entity.
Cash and cash equivalents maturity period	Three months or less
Bottom of range [member]
Disclosure of significant accounting policies [line items]
Voting rights in another entity	20.00%
Expected percentage of increase in accounts receivable reserves	39.00%
Top of range [member]
Disclosure of significant accounting policies [line items]
Voting rights in another entity	50.00%
Expected percentage of increase in accounts receivable reserves	51.10%

Significant Accounting Polici61

Significant Accounting Policies - Disclosure of Consolidated Statements of Financial Position (Detail) $ in Thousands, $ in Thousands	Dec. 31, 2017USD ($)	Dec. 31, 2017MXN ($)	Dec. 31, 2016MXN ($)	Dec. 31, 2015MXN ($)
Disclosure of reclassification of financial assets [line items]
Available-for-sale financial assets	$ 53,416	$ 1,056,918	$ 2,852,679
Total current assets	18,372,255	363,526,290	357,815,923	$ 267,200,497
Investments in joint ventures and associates	844,373	16,707,364	20,737,509	$ 24,165,599
Total non-current assets	$ 89,376,997	$ 1,768,475,824	1,972,070,101
As previously reported [member]
Disclosure of reclassification of financial assets [line items]
Available-for-sale financial assets			435,556
Total current assets			355,398,800
Investments in joint ventures and associates			23,154,632
Total non-current assets			1,974,487,224
Reclassification [member]
Disclosure of reclassification of financial assets [line items]
Available-for-sale financial assets			2,417,123
Total current assets			2,417,123
Investments in joint ventures and associates			(2,417,123)
Total non-current assets			$ (2,417,123)

Significant Accounting Polici62

Significant Accounting Policies - Summary of Reclassification of Other Income (Expenses) (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)	Dec. 31, 2017MXN ($)	Dec. 31, 2016MXN ($)	Dec. 31, 2015MXN ($)
Disclosure of significant accounting policies [line items]
Services income	$ 562,528	$ 11,130,569	$ 8,974,642	$ 8,310,035
Total of sales	70,604,483	1,397,029,719	1,074,093,232	1,161,760,392
Cost of sales	50,751,509	1,004,204,880	865,822,221	891,964,606
Gross income (loss)	12,199,118	241,380,279	539,585,354	(115,971,815)
Other income (expenses), net	$ 261,493	$ 5,174,076	22,649,606	(875,487)
As previously reported [member]
Disclosure of significant accounting policies [line items]
Services income			14,427,081	12,912,112
Total of sales			1,079,545,671	1,166,362,469
Cost of sales			867,580,634	895,068,904
Gross income (loss)			543,279,380	(114,474,036)
Other income (expenses), net			18,955,580	(2,373,266)
Reclassification [member]
Disclosure of significant accounting policies [line items]
Services income			(5,452,439)	(4,602,077)
Total of sales			(5,452,439)	(4,602,077)
Cost of sales			(1,758,413)	(3,104,298)
Gross income (loss)			(3,694,026)	(1,497,779)
Other income (expenses), net			$ 3,694,026	$ 1,497,779

Significant Accounting Polici63

Significant Accounting Policies - Summary of Better Presentation in Duties, Taxes and Other, Certain Amounts in Income Tax (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2016MXN ($)
Hydrocarbon Extraction Duties And Others [Member]
Disclosure of significant accounting policies [line items]
As previously reported	$ 304,813,375
Reclassification	(27,651,571)
Following reclassification	277,161,804
Income Taxes [Member]
Disclosure of significant accounting policies [line items]
As previously reported	(40,291,940)
Reclassification	27,651,571
Following reclassification	$ (12,640,369)

Segment Financial Information -

Segment Financial Information - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2017SegmentMajor_Customer
Disclosure of operating segments [abstract]
Number of business segments | Segment	9
Number of major customers | Major_Customer	32

Segment Financial Information65

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, 2017USD ($)	Dec. 31, 2017MXN ($)	Dec. 31, 2016MXN ($)	Dec. 31, 2015MXN ($)	Dec. 31, 2017MXN ($)	Dec. 31, 2014MXN ($)
Sales:
Trade		$ 1,385,899,150	$ 1,065,118,590	$ 1,153,450,357
Services income	$ 562,528	11,130,569	8,974,642	8,310,035
(Reversal) impairment of wells pipelines, properties, plant and equipment, net		151,444,560	(331,314,343)	477,944,690
Benefit from change in pension plan				(92,177,089)
Cost of sales	50,751,509	1,004,204,880	865,822,221	891,964,606
Gross income (loss)	12,199,118	241,380,279	539,585,354	(115,971,815)
Other revenues (expenses), net	261,493	5,174,076	22,649,606	(875,487)
Distribution, transportation and sales expenses	1,106,282	21,889,670	25,231,240	28,928,639
Administrative expenses	6,061,620	119,939,454	112,653,533	112,472,095
Benefit from change in pension plan				(103,860,955)
Operating income (loss)		104,725,231	424,350,187	(154,387,081)
Financing income	817,006	16,165,853	13,749,255	14,990,859
Financing cost	(5,945,638)	(117,644,548)	(98,844,464)	(67,773,593)
Derivative financial instruments (cost) income, net		25,338,324	(14,000,987)	(21,449,877)
Foreign exchange (loss) income, net	1,171,702	23,184,122	(254,012,743)	(154,765,574)
(Loss) profit sharing in joint ventures and associates	18,216	360,440	2,135,845	2,318,115
Taxes, duties and other		332,980,041	264,521,435	331,500,247
Net (loss) income	(14,193,909)	(280,850,619)	(191,144,342)	(712,567,398)
Total current assets	18,372,255		357,815,923	267,200,497	$ 363,526,290
Investments in joint ventures and associates	844,373		20,737,509	24,165,599	16,707,364
Wells, pipelines, properties, plant and equipment, net	72,599,743		1,667,742,248	1,344,483,631	1,436,509,326
Total assets	107,749,252		2,329,886,024	1,775,654,200	2,132,002,114
Total current liabilities	19,666,099		426,189,886	443,407,721	389,127,185
Long-term debt	95,046,956		1,807,004,542	1,300,873,167	1,880,665,604
Employee benefits	63,600,101		1,220,409,436	1,279,385,441	1,258,436,122
Total liabilities	183,676,636		3,562,894,171	3,107,330,098	3,634,354,499
Equity (deficit), net	$ (75,927,384)		(1,233,008,147)	(1,331,675,898)	(1,502,352,385)	$ (767,720,854)
Depreciation and amortization		156,704,513	150,439,491	167,951,250
Net periodic cost of employee benefits			109,738,416	62,549,142	108,073,075
Acquisition of wells, pipelines, properties, plant and equipment		93,979,817	155,735,343	264,857,811
Exploration and Production [member]
Sales:
Intersegment		762,637,362	616,380,615	690,642,133
(Reversal) impairment of wells pipelines, properties, plant and equipment, net		129,350,315	(271,709,433)	394,396,580
Benefit from change in pension plan				(46,368,308)
Cost of sales		391,089,410	359,064,884	427,158,621
Gross income (loss)		242,197,637	529,025,164	(84,544,760)
Other revenues (expenses), net		10,204,045	27,346,794	(7,957,202)
Administrative expenses		58,539,119	54,509,047	18,454,281
Benefit from change in pension plan				(17,853,725)
Operating income (loss)		193,862,563	501,862,911	(93,102,518)
Financing income		121,293,404	56,040,129	25,852,078
Financing cost		(136,378,338)	(109,946,363)	(90,822,360)
Derivative financial instruments (cost) income, net		(1,613,874)
Foreign exchange (loss) income, net		10,043,316	(217,166,718)	(132,165,427)
(Loss) profit sharing in joint ventures and associates		(75,195)	(21,164)	(473,082)
Taxes, duties and other		338,169,260	276,647,448	376,682,705
Net (loss) income		(151,037,384)	(45,878,653)	(667,394,014)
Total current assets			983,260,710	709,252,019	1,036,063,541
Investments in joint ventures and associates			139,523	919,654	64,328
Wells, pipelines, properties, plant and equipment, net			1,176,504,263	966,144,619	945,945,889
Total assets			2,206,418,541	1,698,909,240	2,058,036,405
Total current liabilities			340,011,451	278,507,394	284,656,058
Long-term debt			1,737,109,328	1,252,239,594	1,826,843,268
Employee benefits			362,312,386	379,150,943	372,032,958
Total liabilities			2,533,221,665	1,985,557,185	2,570,412,398
Equity (deficit), net			(326,803,124)	(286,647,945)	(512,375,993)
Depreciation and amortization		127,742,568	124,329,921	144,567,149
Net periodic cost of employee benefits			32,617,215	23,608,485	32,794,386
Acquisition of wells, pipelines, properties, plant and equipment		67,845,989	70,418,370	184,786,051
Industrial Transformation [member]
Sales:
Trade		857,456,146	648,088,013	740,190,020
Intersegment		150,360,283	117,096,378	126,294,195
Services income		6,116,937	5,565,604	7,549,061
(Reversal) impairment of wells pipelines, properties, plant and equipment, net		15,952,092	(52,498,881)	76,442,079
Benefit from change in pension plan				(45,808,781)
Cost of sales		1,004,683,554	823,763,927	876,531,944
Gross income (loss)		(6,702,280)	(515,051)	(33,131,966)
Other revenues (expenses), net		1,515,538	19,964,654	1,243,040
Distribution, transportation and sales expenses		26,049,566	50,792,317	35,292,527
Administrative expenses		38,994,887	34,183,846	40,529,587
Benefit from change in pension plan				(39,975,450)
Operating income (loss)		(70,231,195)	(65,526,560)	(67,735,590)
Financing income		11,427,907	11,056,345	2,789,535
Financing cost		(2,398,643)	(3,188,892)	(13,738,104)
Derivative financial instruments (cost) income, net		5,835	3,172	6,463
Foreign exchange (loss) income, net		4,924,209	(12,858,875)	(7,364,486)
(Loss) profit sharing in joint ventures and associates		485,224	649,520	671,868
Taxes, duties and other				1,839,021
Net (loss) income		(55,786,663)	(69,865,290)	(87,209,335)
Total current assets			795,237,287	313,801,630	570,380,888
Investments in joint ventures and associates			257,159	6,687,977	4
Wells, pipelines, properties, plant and equipment, net			311,432,174	246,463,069	286,423,735
Total assets			1,107,094,580	567,486,579	857,196,306
Total current liabilities			666,467,674	104,569,842	459,130,165
Long-term debt			31,495,027	16,707,005	25,437,147
Employee benefits			575,277,374	609,492,623	588,573,518
Total liabilities			1,278,138,290	735,280,560	1,077,108,748
Equity (deficit), net			(171,043,710)	(167,793,981)	(219,912,442)
Depreciation and amortization		17,935,112	17,425,472	20,916,796
Net periodic cost of employee benefits			52,886,397	21,392,600	52,538,989
Acquisition of wells, pipelines, properties, plant and equipment		14,678,182	32,254,531	68,935,841
Cogeneration and Services [member]
Sales:
Intersegment		114,233	51,913
Services income		334,755	132,521
Cost of sales		472,732	166,721	2,793
Gross income (loss)		(23,744)	17,713	(2,793)
Other revenues (expenses), net		2,646
Distribution, transportation and sales expenses		13,581	8,232	1,448
Administrative expenses		37,679	32,126	47,670
Operating income (loss)		(72,358)	(22,645)	(51,911)
Financing income		147
Financing cost		(19,882)	(12,055)	2,110
Foreign exchange (loss) income, net				(7,509)
Net (loss) income		(92,093)	(34,700)	(57,310)
Total current assets			388,422	655,239	179,807
Total assets			388,423	655,240	179,807
Total current liabilities			472,236	469,524	531,580
Employee benefits			191,876	61,171
Total liabilities			664,829	530,696	531,580
Equity (deficit), net			(276,406)	124,544	(351,773)
Net periodic cost of employee benefits			5,860	(298)
Drilling and Services [member]
Sales:
Intersegment		3,400,456	1,981,754	1,511,970
Services income		41,741	70,112
Cost of sales		468,171	143,956	706,896
Gross income (loss)		2,974,026	1,907,910	805,074
Other revenues (expenses), net		(31,454)	591,704	38
Distribution, transportation and sales expenses			6
Administrative expenses		888,776	983,560	8,553
Operating income (loss)		2,053,796	1,516,048	796,559
Financing income		57,313	72,995	43,690
Financing cost		(795,947)	(642,711)	(95,280)
Foreign exchange (loss) income, net		227,365	(1,570,317)	(92,046)
Taxes, duties and other		276,967	(481,581)	197,491
Net (loss) income		1,265,560	(142,404)	455,432
Total current assets			6,032,213	2,171,717	6,871,148
Wells, pipelines, properties, plant and equipment, net			21,023,629	22,647,454	18,956,882
Total assets			27,673,598	24,917,981	26,220,748
Total current liabilities			3,894,121	1,981,652	2,201,936
Long-term debt			12,489,423	12,031,849	11,258,734
Employee benefits			441,127	417,817	333,212
Total liabilities			16,853,202	14,431,318	13,886,424
Equity (deficit), net			10,820,396	10,486,663	12,334,324
Depreciation and amortization		2,368,123	2,559,357	612,741
Net periodic cost of employee benefits			31,491		39,697
Acquisition of wells, pipelines, properties, plant and equipment		418,283	2,053,139
Logistics [member]
Sales:
Intersegment		70,671,871	68,316,958	598,853
Services income		3,714,941	2,813,887	10,355,988
(Reversal) impairment of wells pipelines, properties, plant and equipment, net			(5,829,520)	5,829,519
Cost of sales		50,926,263	61,248,584	10,727,462
Gross income (loss)		23,460,549	15,711,781	(5,602,140)
Other revenues (expenses), net		(24,134,436)	(27,189,969)	26,941
Distribution, transportation and sales expenses		73,526	148,215	3,009
Administrative expenses		7,459,928	7,175,451	104,794
Operating income (loss)		(8,207,341)	(18,801,854)	(5,683,002)
Financing income		1,622,827	373,301	37
Financing cost		(2,307,427)	(481,741)	(61,153)
Foreign exchange (loss) income, net		613,099	(1,118,537)	(11,090)
(Loss) profit sharing in joint ventures and associates		(74)
Taxes, duties and other		(7,444,967)	(10,010,686)	(2,069,848)
Net (loss) income		(833,949)	(10,018,145)	(3,685,360)
Total current assets			22,087,801	49,162,929	49,391,784
Investments in joint ventures and associates					18,336
Wells, pipelines, properties, plant and equipment, net			86,695,514	58,078,603	119,647,553
Total assets			130,824,921	111,307,038	191,895,993
Total current liabilities			19,824,792	14,698,159	44,521,371
Long-term debt			4,382,109	4,850,905	2,814,640
Employee benefits			571,702	368,036	1,842,892
Total liabilities			29,336,417	19,917,100	56,706,251
Equity (deficit), net			101,488,504	91,389,938	135,189,742
Depreciation and amortization		4,562,140	2,230,557	337,364
Net periodic cost of employee benefits			30,340	(310)	(4,954)
Acquisition of wells, pipelines, properties, plant and equipment		5,189,409	26,344,495	1,544,224
Fertilizers [member]
Sales:
Trade		4,123,006	3,873,403	1,494,478
Intersegment		642,965	900,464	209,970
Services income		2,339	1,908	236
(Reversal) impairment of wells pipelines, properties, plant and equipment, net		1,935,500
Cost of sales		6,001,259	5,506,198	1,707,548
Gross income (loss)		(3,168,449)	(730,423)	(2,864)
Other revenues (expenses), net		9,013	32,710	14,680
Distribution, transportation and sales expenses		528,370	185,168	4,416
Administrative expenses		352,537	731,479	152,404
Operating income (loss)		(4,040,343)	(1,614,360)	(145,004)
Financing income		2,248	4,358	3,503
Financing cost		(211,004)	(20,217)
Foreign exchange (loss) income, net		(20,925)	(29,263)	(3,600)
Net (loss) income		(4,270,024)	(1,659,482)	(145,101)
Total current assets			1,724,967	1,594,643	3,155,476
Investments in joint ventures and associates				8,500
Wells, pipelines, properties, plant and equipment, net			7,771,634	7,405,969	5,713,998
Total assets			9,556,469	9,034,376	8,923,456
Total current liabilities			2,995,088	1,486,468	6,455,246
Employee benefits			20,362	12,533	98,361
Total liabilities			3,015,450	1,499,001	6,556,050
Equity (deficit), net			6,541,019	7,535,375	2,367,406
Depreciation and amortization		422,930	481,241	158,505
Net periodic cost of employee benefits			(1,178)		(1,999)
Acquisition of wells, pipelines, properties, plant and equipment		219,152	889,420	320,762
Ethylene [member]
Sales:
Trade		12,621,648	15,392,552	4,551,413
Intersegment		1,565,757	1,764,438	473,990
Services income		26,733	60,141	17,893
(Reversal) impairment of wells pipelines, properties, plant and equipment, net			(1,276,509)	1,276,512
Cost of sales		14,272,340	13,936,213	4,965,414
Gross income (loss)		(58,202)	4,557,427	(1,198,630)
Other revenues (expenses), net		23,030	63,989	19,909
Distribution, transportation and sales expenses		334,663	481,727	62,071
Administrative expenses		1,105,554	2,101,834	519,351
Operating income (loss)		(1,475,389)	2,037,855	(1,760,143)
Financing income		46,113	64,582	7,728
Financing cost		(1,964)	(2,980)
Foreign exchange (loss) income, net		(10,486)	(2,843)	(2,802)
Net (loss) income		(1,441,726)	2,096,614	(1,755,217)
Total current assets			5,817,262	4,988,511	3,994,381
Wells, pipelines, properties, plant and equipment, net			20,086,650	18,480,684	19,008,822
Total assets			26,007,319	23,705,118	23,142,045
Total current liabilities			3,879,828	4,534,980	2,183,654
Employee benefits			21,893	3,611	105,033
Total liabilities			3,901,722	4,538,591	2,308,890
Equity (deficit), net			22,105,597	19,166,527	20,833,155
Depreciation and amortization		1,688,493	1,395,232	442,504
Net periodic cost of employee benefits			1,424		(12,561)
Acquisition of wells, pipelines, properties, plant and equipment		475,196	1,724,690	1,882,108
Trading Companies [member]
Sales:
Trade		508,539,112	395,118,117	407,214,446
Intersegment		539,193,190	405,293,283	353,137,149
Services income		66,621	236,230	661,683
Cost of sales		1,031,997,901	783,691,245	749,655,199
Gross income (loss)		15,801,022	16,956,385	11,358,079
Other revenues (expenses), net		307,212	3,412,711	1,666,783
Distribution, transportation and sales expenses		375,482	229,432	428,613
Administrative expenses		1,564,859	1,157,182	1,967,581
Operating income (loss)		14,167,893	18,982,482	10,628,668
Financing income		905,405	1,098,079	1,147,870
Financing cost		(1,328,827)	(1,342,351)	(1,299,580)
Derivative financial instruments (cost) income, net		(772,143)	(1,951,959)	1,347,323
Foreign exchange (loss) income, net		(4,318)	174,866	(49,190)
(Loss) profit sharing in joint ventures and associates		1,049,809	1,586,503	2,056,259
Taxes, duties and other		1,972,718	7,380,870	5,134,176
Net (loss) income		12,045,101	11,166,750	8,697,174
Total current assets			125,081,531	73,116,155	158,414,445
Investments in joint ventures and associates			17,568,893	11,845,489	15,805,506
Wells, pipelines, properties, plant and equipment, net			6,691,813	3,045,704	6,739,231
Total assets			155,376,864	93,266,620	186,808,899
Total current liabilities			78,894,485	34,749,438	112,046,527
Long-term debt			3,597,938	3,607,840	2,712,654
Employee benefits			(749,034)	(59,581)	(966,238)
Total liabilities			86,885,889	41,420,792	116,842,881
Equity (deficit), net			68,490,975	51,845,828	69,966,018
Depreciation and amortization		(19,798)	86,707	84,493
Net periodic cost of employee benefits			(552,735)	(119,819)	16,166
Acquisition of wells, pipelines, properties, plant and equipment		321,145	1,019,484	677,314
Corporate and Other Operating Subsidiary Companies [member]
Sales:
Trade		3,159,238	2,646,505
Intersegment		79,031,944	50,683,175	18,296,515
Services income		826,502	473,415	505,032
(Reversal) impairment of wells pipelines, properties, plant and equipment, net		4,206,653
Cost of sales		33,033,923	7,260,043	2,791,350
Gross income (loss)		45,777,108	46,543,052	16,010,197
Other revenues (expenses), net		(5,344,872)	(906,183)	2,219,539
Distribution, transportation and sales expenses		59,043	49,162	254
Administrative expenses		62,001,641	60,497,232	61,609,813
Benefit from change in pension plan				(46,031,780)
Operating income (loss)		(21,628,448)	(14,909,525)	2,651,449
Financing income		145,907,795	125,964,466	110,816,691
Financing cost		(239,003,771)	(163,400,779)	(87,289,616)
Derivative financial instruments (cost) income, net		27,718,506	(12,052,200)	(22,803,663)
Foreign exchange (loss) income, net		7,411,862	(21,441,056)	(15,069,424)
(Loss) profit sharing in joint ventures and associates		(212,666,494)	(117,426,818)	(749,900,890)
Taxes, duties and other		6,063	(9,014,616)	(50,283,298)
Net (loss) income		(292,266,613)	(194,251,296)	(711,312,155)
Total current assets			613,881,578	275,582,816	506,187,594
Investments in joint ventures and associates			(247,349,711)	(242,233,405)	(465,026,224)
Wells, pipelines, properties, plant and equipment, net			37,536,571	22,217,529	34,073,216
Total assets			2,359,024,145	1,443,189,885	2,111,740,735
Total current liabilities			1,497,612,971	1,157,183,570	1,439,097,882
Long-term debt			1,757,315,685	1,285,676,066	1,837,690,559
Employee benefits			282,321,750	289,938,288	296,416,386
Total liabilities			3,553,477,189	2,747,910,113	3,587,988,972
Equity (deficit), net			(1,194,453,044)	(1,304,720,228)	(1,476,248,237)
Depreciation and amortization		2,004,945	1,931,004	831,698
Net periodic cost of employee benefits			24,719,602	17,668,484	22,703,351
Acquisition of wells, pipelines, properties, plant and equipment		4,832,461	21,031,214	6,711,511
Intersegment Eliminations [member]
Sales:
Intersegment		(1,607,618,061)	(1,262,468,978)	(1,191,164,775)
Services income			(379,176)	(10,779,858)
Cost of sales		(1,528,740,673)	(1,188,959,550)	(1,182,282,621)
Gross income (loss)		(78,877,388)	(73,888,604)	(19,662,012)
Other revenues (expenses), net		22,623,354	(666,804)	1,890,785
Distribution, transportation and sales expenses		(5,544,561)	(26,663,019)	(6,863,699)
Administrative expenses		(51,005,526)	(48,718,224)	(10,921,939)
Operating income (loss)		296,053	825,835	14,411
Financing income		(265,097,306)	(180,925,000)	(125,670,273)
Financing cost		264,801,255	180,193,625	125,530,390
(Loss) profit sharing in joint ventures and associates		211,567,170	117,347,804	749,963,960
Net (loss) income		$ 211,567,172	117,442,264	749,838,488
Total current assets			(2,195,695,848)	(1,163,125,162)	(1,971,112,774)
Investments in joint ventures and associates			250,121,645	246,937,384	465,845,414
Total assets			(3,692,478,836)	(2,196,817,877)	(3,332,142,280)
Total current liabilities			(2,187,862,760)	(1,154,773,306)	(1,961,697,234)
Long-term debt			(1,739,384,968)	(1,274,240,092)	(1,826,091,398)
Total liabilities			(3,942,600,482)	(2,443,755,258)	(3,797,987,695)
Equity (deficit), net			$ 250,121,646	$ 246,937,381	$ 465,845,415

Segment Financial Information66

Segment Financial Information - Schedule of Accounting Reconciliations Between Individual and Consolidated Information (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)	Dec. 31, 2017MXN ($)	Dec. 31, 2016MXN ($)	Dec. 31, 2015MXN ($)	Dec. 31, 2017MXN ($)
Disclosure of operating segments [line items]
Total consolidated sales	$ 70,604,483	$ 1,397,029,719	$ 1,074,093,232	$ 1,161,760,392
Total consolidated operating (loss) income		104,725,231	424,350,187	(154,387,081)
Total consolidated net (loss) income	(14,193,909)	(280,850,619)	(191,144,342)	(712,567,398)
Total consolidated assets	107,749,252		2,329,886,024	1,775,654,200	$ 2,132,002,114
Total consolidated liabilities	$ 183,676,636		3,562,894,171	3,107,330,098	3,634,354,499
Exploration and Production [member]
Disclosure of operating segments [line items]
Total consolidated sales		762,637,362	616,380,615	690,642,133
Total consolidated operating (loss) income		193,862,563	501,862,911	(93,102,518)
Total consolidated net (loss) income		(151,037,384)	(45,878,653)	(667,394,014)
Total consolidated assets			2,206,418,541	1,698,909,240	2,058,036,405
Total consolidated liabilities			2,533,221,665	1,985,557,185	2,570,412,398
Exploration and Production [member] | By segment [member]
Disclosure of operating segments [line items]
Total consolidated sales		762,637,362	616,380,615	690,642,133
Total consolidated operating (loss) income		194,814,292	503,679,153	(89,473,302)
Total consolidated net (loss) income		(150,388,699)	(44,069,001)	(663,719,119)
Total consolidated assets			2,232,052,453		2,084,553,745
Total consolidated liabilities			2,533,221,665		2,570,412,398
Exploration and Production [member] | unrealized Intersegment Sales [member]
Disclosure of operating segments [line items]
Total consolidated assets			483,230		858,094
Exploration and Production [member] | unrealized Gain due to Production Cost Valuation of Inventory [member]
Disclosure of operating segments [line items]
Total consolidated operating (loss) income		(496,329)	(273,237)	(251,995)
Total consolidated net (loss) income		(496,329)	(273,237)	(251,995)
Total consolidated assets			(3,246,782)		(3,657,242)
Exploration and Production [member] | Capitalized Refined Products [member]
Disclosure of operating segments [line items]
Total consolidated operating (loss) income		(574,381)	(1,661,986)	(3,496,201)
Total consolidated net (loss) income		(574,381)	(1,661,986)	(3,496,201)
Total consolidated assets			(1,661,986)		(574,381)
Exploration and Production [member] | Amortization of Capitalized Interest [member]
Disclosure of operating segments [line items]
Total consolidated operating (loss) income		118,981	118,981	118,980
Total consolidated net (loss) income		118,981	118,981	118,980
Total consolidated assets			118,981		118,981
Exploration and Production [member] | Depreciation and impairment of revaluated transferred assets net of deferred taxess [member]
Disclosure of operating segments [line items]
Total consolidated assets			(20,585,300)
Exploration and Production [member] | Equity Method Elimination [member]
Disclosure of operating segments [line items]
Total consolidated net (loss) income		303,044	6,590	(45,679)
Total consolidated assets			(742,055)		(759,624)
Exploration and Production [member] | Depreciation of Revaluated Assets [member]
Disclosure of operating segments [line items]
Total consolidated assets					(22,503,168)
Industrial Transformation [member]
Disclosure of operating segments [line items]
Total consolidated sales		1,013,933,366	770,749,995	874,033,276
Total consolidated operating (loss) income		(70,231,195)	(65,526,560)	(67,735,590)
Total consolidated net (loss) income		(55,786,663)	(69,865,290)	(87,209,335)
Total consolidated assets			1,107,094,580	567,486,579	857,196,306
Total consolidated liabilities			1,278,138,290	735,280,560	1,077,108,748
Industrial Transformation [member] | By segment [member]
Disclosure of operating segments [line items]
Total consolidated sales		1,015,157,118	771,597,427	874,630,488
Total consolidated operating (loss) income		(59,989,652)	(60,347,367)	(88,819,558)
Total consolidated net (loss) income		(44,599,751)	(61,639,067)	(107,164,261)
Total consolidated assets			1,151,907,566		912,770,881
Total consolidated liabilities			1,282,558,220		1,081,528,677
Industrial Transformation [member] | unrealized Intersegment Sales [member]
Disclosure of operating segments [line items]
Total consolidated sales		(1,223,752)	(847,432)	(597,212)
Total consolidated operating (loss) income		(1,223,752)	(847,432)	(597,212)
Total consolidated net (loss) income		(1,223,752)	(847,432)	(597,212)
Total consolidated assets			(4,158,101)		(5,389,977)
Total consolidated liabilities			(4,419,930)		(4,419,929)
Industrial Transformation [member] | unrealized Gain due to Production Cost Valuation of Inventory [member]
Disclosure of operating segments [line items]
Total consolidated operating (loss) income		(9,017,791)	3,572,498	21,681,180
Total consolidated net (loss) income		(9,017,791)	3,572,498	21,681,180
Total consolidated assets			(33,361,438)		(42,379,229)
Industrial Transformation [member] | Capitalized Refined Products [member]
Disclosure of operating segments [line items]
Total consolidated operating (loss) income			(7,904,259)
Total consolidated net (loss) income			(7,904,259)
Industrial Transformation [member] | Amortization of Capitalized Interest [member]
Disclosure of operating segments [line items]
Total consolidated assets					8,123
Industrial Transformation [member] | Equity Method Elimination [member]
Disclosure of operating segments [line items]
Total consolidated net (loss) income		(945,369)	(3,047,030)	(1,129,042)
Total consolidated assets			(7,293,447)		(7,813,492)
Cogeneration and Services [member]
Disclosure of operating segments [line items]
Total consolidated sales		448,988	184,434
Total consolidated operating (loss) income		(72,358)	(22,645)	(51,911)
Total consolidated net (loss) income		(92,093)	(34,700)	(57,310)
Total consolidated assets			388,423	655,240	179,807
Total consolidated liabilities			664,829	530,696	531,580
Cogeneration and Services [member] | By segment [member]
Disclosure of operating segments [line items]
Total consolidated sales		448,988	184,434
Total consolidated operating (loss) income		(72,358)	(22,645)	(51,911)
Total consolidated net (loss) income		(358,862)	(381,214)	(57,310)
Total consolidated assets			425,141		179,807
Total consolidated liabilities			664,829		531,580
Cogeneration and Services [member] | Equity Method Elimination [member]
Disclosure of operating segments [line items]
Total consolidated net (loss) income		266,769	346,514
Total consolidated assets			(36,718)
Drilling and Services [member]
Disclosure of operating segments [line items]
Total consolidated sales		3,442,197	2,051,866	1,511,970
Total consolidated operating (loss) income		2,053,796	1,516,048	796,559
Total consolidated net (loss) income		1,265,560	(142,404)	455,432
Total consolidated assets			27,673,598	24,917,981	26,220,748
Total consolidated liabilities			16,853,202	14,431,318	13,886,424
Drilling and Services [member] | By segment [member]
Disclosure of operating segments [line items]
Total consolidated sales		6,679,132	6,263,093	1,511,970
Total consolidated operating (loss) income		882,692	1,271,202	700,748
Total consolidated net (loss) income		345,913	(387,250)	359,621
Total consolidated assets			30,990,147		28,256,876
Total consolidated liabilities			16,457,347		13,186,297
Drilling and Services [member] | unrealized Intersegment Sales [member]
Disclosure of operating segments [line items]
Total consolidated sales		(3,236,935)	(4,211,227)
Total consolidated operating (loss) income		(3,236,935)	(4,211,227)
Total consolidated net (loss) income		(3,236,935)	(4,211,227)
Total consolidated liabilities			395,855		700,127
Drilling and Services [member] | unrealized Gain due to Production Cost Valuation of Inventory [member]
Disclosure of operating segments [line items]
Total consolidated operating (loss) income		2,932,663	3,815,371
Total consolidated net (loss) income		2,932,663	3,815,371
Drilling and Services [member] | Depreciation and impairment of revaluated transferred assets net of deferred taxess [member]
Disclosure of operating segments [line items]
Total consolidated operating (loss) income		1,475,376	640,702	95,811
Total consolidated net (loss) income			640,702	95,811
Total consolidated assets			(3,316,549)
Drilling and Services [member] | Depreciation of Revaluated Assets [member]
Disclosure of operating segments [line items]
Total consolidated net (loss) income		1,223,919
Total consolidated assets					(2,036,128)
Logistics [member]
Disclosure of operating segments [line items]
Total consolidated sales		74,386,812	71,130,845	10,954,841
Total consolidated operating (loss) income		(8,207,341)	(18,801,854)	(5,683,002)
Total consolidated net (loss) income		(833,949)	(10,018,145)	(3,685,360)
Total consolidated assets			130,824,921	111,307,038	191,895,993
Total consolidated liabilities			29,336,417	19,917,100	56,706,251
Logistics [member] | By segment [member]
Disclosure of operating segments [line items]
Total consolidated sales		74,386,812	71,130,845	10,954,841
Total consolidated operating (loss) income		(61,696,313)	(25,701,065)	(6,875,252)
Total consolidated net (loss) income		(40,300,942)	(16,917,356)	(4,877,610)
Total consolidated assets			254,615,026		276,537,764
Total consolidated liabilities			29,336,417		56,706,251
Logistics [member] | unrealized Intersegment Sales [member]
Disclosure of operating segments [line items]
Total consolidated assets					7,183
Logistics [member] | Depreciation and impairment of revaluated transferred assets net of deferred taxess [member]
Disclosure of operating segments [line items]
Total consolidated operating (loss) income		53,488,972	6,899,211	1,192,250
Total consolidated net (loss) income			6,899,211	1,192,250
Total consolidated assets			(123,790,105)
Logistics [member] | Equity Method Elimination [member]
Disclosure of operating segments [line items]
Total consolidated net (loss) income		333
Total consolidated assets					(91,123)
Logistics [member] | Depreciation of Revaluated Assets [member]
Disclosure of operating segments [line items]
Total consolidated net (loss) income		39,466,660
Total consolidated assets					(84,557,831)
Fertilizers [member]
Disclosure of operating segments [line items]
Total consolidated sales		4,768,310	4,775,775	1,704,684
Total consolidated operating (loss) income		(4,040,343)	(1,614,360)	(145,004)
Total consolidated net (loss) income		(4,270,024)	(1,659,482)	(145,101)
Total consolidated assets			9,556,469	9,034,376	8,923,456
Total consolidated liabilities			3,015,450	1,499,001	6,556,050
Fertilizers [member] | By segment [member]
Disclosure of operating segments [line items]
Total consolidated sales		4,795,196	4,775,775	1,704,684
Total consolidated operating (loss) income		(7,148,431)	(2,877,725)	(262,145)
Total consolidated net (loss) income		(8,616,130)	(7,820,835)	(262,242)
Total consolidated assets			10,421,225		17,689,305
Total consolidated liabilities			3,015,450		6,556,050
Fertilizers [member] | unrealized Intersegment Sales [member]
Disclosure of operating segments [line items]
Total consolidated sales		(26,886)
Total consolidated operating (loss) income		(26,886)
Total consolidated net (loss) income		(26,886)
Fertilizers [member] | unrealized Gain due to Production Cost Valuation of Inventory [member]
Disclosure of operating segments [line items]
Total consolidated operating (loss) income			905,910
Total consolidated net (loss) income			905,910
Total consolidated assets					(26,886)
Fertilizers [member] | Depreciation and impairment of revaluated transferred assets net of deferred taxess [member]
Disclosure of operating segments [line items]
Total consolidated operating (loss) income		3,134,974	357,455	117,141
Total consolidated net (loss) income			357,455	117,141
Total consolidated assets			(5,300,044)
Fertilizers [member] | Equity Method Elimination [member]
Disclosure of operating segments [line items]
Total consolidated net (loss) income		1,238,018	4,897,988
Total consolidated assets			4,435,288		(6,573,895)
Fertilizers [member] | Depreciation of Revaluated Assets [member]
Disclosure of operating segments [line items]
Total consolidated net (loss) income		3,134,974
Total consolidated assets					(2,165,068)
Ethylene [member]
Disclosure of operating segments [line items]
Total consolidated sales		14,214,138	17,217,131	5,043,296
Total consolidated operating (loss) income		(1,475,389)	2,037,855	(1,760,143)
Total consolidated net (loss) income		(1,441,726)	2,096,614	(1,755,217)
Total consolidated assets			26,007,319	23,705,118	23,142,045
Total consolidated liabilities			3,901,722	4,538,591	2,308,890
Ethylene [member] | By segment [member]
Disclosure of operating segments [line items]
Total consolidated sales		14,214,138	17,217,131	5,048,600
Total consolidated operating (loss) income		(4,698,838)	(3,504,812)	(2,288,747)
Total consolidated net (loss) income		(5,866,542)	(3,780,706)	(2,314,774)
Total consolidated assets			43,067,636		35,498,783
Total consolidated liabilities			3,901,722		2,308,890
Ethylene [member] | unrealized Intersegment Sales [member]
Disclosure of operating segments [line items]
Total consolidated sales				(5,304)
Total consolidated operating (loss) income				(5,304)
Total consolidated net (loss) income				(5,304)
Total consolidated assets			(5,304)		(5,303)
Ethylene [member] | unrealized Gain due to Production Cost Valuation of Inventory [member]
Disclosure of operating segments [line items]
Total consolidated operating (loss) income			(2,163)	2,163
Total consolidated net (loss) income			(2,163)	2,163
Ethylene [member] | Depreciation and impairment of revaluated transferred assets net of deferred taxess [member]
Disclosure of operating segments [line items]
Total consolidated operating (loss) income		3,223,449	5,544,830	531,745
Total consolidated net (loss) income			5,544,830	531,745
Total consolidated assets			(12,746,136)
Ethylene [member] | Equity Method Elimination [member]
Disclosure of operating segments [line items]
Total consolidated net (loss) income		1,201,367	334,653	30,953
Total consolidated assets			(4,308,877)		(2,828,749)
Ethylene [member] | Depreciation of Revaluated Assets [member]
Disclosure of operating segments [line items]
Total consolidated net (loss) income		3,223,449
Total consolidated assets					(9,522,686)
Trading Companies [member]
Disclosure of operating segments [line items]
Total consolidated sales		1,047,798,923	800,647,630	761,013,278
Total consolidated operating (loss) income		14,167,893	18,982,482	10,628,668
Total consolidated net (loss) income		12,045,101	11,166,750	8,697,174
Total consolidated assets			155,376,864	93,266,620	186,808,899
Total consolidated liabilities			86,885,889	41,420,792	116,842,881
Trading Companies [member] | By segment [member]
Disclosure of operating segments [line items]
Total consolidated sales		1,047,874,453	800,979,076	761,213,475
Total consolidated operating (loss) income		14,490,017	19,526,997	10,334,138
Total consolidated net (loss) income		5,200,268	11,711,265	8,402,644
Total consolidated assets			170,782,928		195,538,239
Total consolidated liabilities			85,392,123		116,648,398
Trading Companies [member] | unrealized Intersegment Sales [member]
Disclosure of operating segments [line items]
Total consolidated sales		(75,530)	(331,446)	(200,197)
Total consolidated operating (loss) income		(75,530)	(331,446)	(200,197)
Total consolidated net (loss) income		(75,530)	(331,446)	(200,197)
Total consolidated assets			(332,529)		(408,059)
Total consolidated liabilities			1,493,766		194,483
Trading Companies [member] | unrealized Gain due to Production Cost Valuation of Inventory [member]
Disclosure of operating segments [line items]
Total consolidated operating (loss) income		(246,594)	(213,069)	494,727
Total consolidated net (loss) income		(246,594)	(213,069)	494,727
Total consolidated assets			(5,688,341)		(7,163,664)
Trading Companies [member] | Amortization of Capitalized Interest [member]
Disclosure of operating segments [line items]
Total consolidated assets			(424,198)
Trading Companies [member] | Depreciation and impairment of revaluated transferred assets net of deferred taxess [member]
Disclosure of operating segments [line items]
Total consolidated assets			(652)
Trading Companies [member] | Equity Method Elimination [member]
Disclosure of operating segments [line items]
Total consolidated net (loss) income		7,166,957
Total consolidated assets			(8,960,344)		(732,768)
Trading Companies [member] | Depreciation of Revaluated Assets [member]
Disclosure of operating segments [line items]
Total consolidated assets					(424,849)
Corporate and Other Operating Subsidiary Companies [member]
Disclosure of operating segments [line items]
Total consolidated sales		83,017,684	53,803,095	18,801,547
Total consolidated operating (loss) income		(21,628,448)	(14,909,525)	2,651,449
Total consolidated net (loss) income		(292,266,613)	(194,251,296)	(711,312,155)
Total consolidated assets			2,359,024,145	1,443,189,885	2,111,740,735
Total consolidated liabilities			3,553,477,189	2,747,910,113	3,587,988,972
Corporate and Other Operating Subsidiary Companies [member] | By segment [member]
Disclosure of operating segments [line items]
Total consolidated sales		83,017,684	53,803,095	18,801,547
Total consolidated operating (loss) income		(21,628,448)	(14,909,525)	2,651,449
Total consolidated net (loss) income		$ (292,266,613)	(194,251,296)	$ (711,312,155)
Total consolidated assets			2,359,024,145		2,111,740,735
Total consolidated liabilities			$ 3,553,477,189		$ 3,587,988,972

Segment Financial Information67

Segment Financial Information - Supplemental Geographic Information (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)	Dec. 31, 2017MXN ($)	Dec. 31, 2016MXN ($)	Dec. 31, 2015MXN ($)
Disclosure of operating segments [line items]
Domestic sales	$ 44,340,898	$ 877,360,038	$ 670,000,473	$ 746,235,912
Total export sales	25,701,057	508,539,112	395,118,117	407,214,445
Services income	562,528	11,130,569	8,974,642	8,310,035
Total sales	$ 70,604,483	1,397,029,719	1,074,093,232	1,161,760,392
UNITED STATES
Disclosure of operating segments [line items]
Total export sales		302,912,999	221,954,461	266,826,499
Canada, Central and South America [member]
Disclosure of operating segments [line items]
Total export sales		13,943,080	14,058,897	11,027,813
Europe [member]
Disclosure of operating segments [line items]
Total export sales		71,470,613	64,348,997	58,707,787
Other [member]
Disclosure of operating segments [line items]
Total export sales		$ 120,212,420	$ 94,755,762	$ 70,652,346

Segment Financial Information68

Segment Financial Information - Schedule of Income by Product (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)	Dec. 31, 2017MXN ($)	Dec. 31, 2016MXN ($)	Dec. 31, 2015MXN ($)
Disclosure of operating segments [line items]
Total domestic sales	$ 44,340,898	$ 877,360,038	$ 670,000,473	$ 746,235,912
Total export sales	$ 25,701,057	508,539,112	395,118,117	407,214,445
Refined Petroleum Products and Derivatives [member]
Disclosure of operating segments [line items]
Total domestic sales		784,048,048	578,718,674	660,573,780
Total export sales		109,615,457	92,705,248	118,129,615
Gas [member]
Disclosure of operating segments [line items]
Total domestic sales		70,930,855	59,648,576	54,497,824
Total export sales		21,675	20,995	27,283
Petrochemical Products [member]
Disclosure of operating segments [line items]
Total domestic sales		22,381,135	31,633,223	31,164,308
Total export sales		18,440,833	13,766,080	887,096
Crude oil [member]
Disclosure of operating segments [line items]
Total export sales		$ 380,461,147	$ 288,625,794	$ 288,170,451

Cash, Cash Equivalents and Re69

Cash, Cash Equivalents and Restricted Cash - Summary of Cash and Cash Equivalents (Detail) $ in Thousands, $ in Thousands	Dec. 31, 2017USD ($)	Dec. 31, 2017MXN ($)	Dec. 31, 2016USD ($)	Dec. 31, 2016MXN ($)	Dec. 31, 2015MXN ($)	Dec. 31, 2014MXN ($)
Cash and cash equivalents [abstract]
Cash on hand and in banks		$ 55,871,127		$ 71,430,427
Highly liquid investments		41,980,627		92,102,086
Cash and cash equivalents	$ 4,945,330	$ 97,851,754	$ 8,264,769	$ 163,532,513	$ 109,368,880	$ 117,988,528

Cash, Cash Equivalents and Re70

Cash, Cash Equivalents and Restricted Cash - Summary of Restricted Cash (Detail) $ in Thousands	Dec. 31, 2016MXN ($)
Disclosure Of Restricted Cash And Cash Equivalents [Abstract]
Restricted cash	$ 10,478,626

Cash, Cash Equivalents and Re71

Cash, Cash Equivalents and Restricted Cash - Additional Information (Detail) - USD ($) $ in Thousands	Apr. 06, 2017	Dec. 31, 2016
Collateral [member]
Disclosure of Restricted Cash and Cash Equivalents [Line Items]
Deposit amount		$ 41,319
Pemex exploration and production [member]
Disclosure of Restricted Cash and Cash Equivalents [Line Items]
Deposit amount		$ 465,060
Settlement amount paid	$ 435,000

Accounts Receivable, Net - Summ

Accounts Receivable, Net - Summary of Accounts Receivable and Other Receivables (Detail) $ in Thousands, $ in Thousands	Dec. 31, 2017USD ($)	Dec. 31, 2017MXN ($)	Dec. 31, 2016MXN ($)
Trade and Other Receivables [Line Items]
Accounts receivable, net	$ 8,624,239	$ 170,645,234	$ 133,220,527
Domestic customers [member]
Trade and Other Receivables [Line Items]
Accounts receivable, net		60,057,141	41,884,579
Export customers [member]
Trade and Other Receivables [Line Items]
Accounts receivable, net		54,428,883	34,859,341
Sundry debtors [member]
Trade and Other Receivables [Line Items]
Accounts receivable, net		26,105,703	18,736,922
Taxes recovered and prepaid taxes [member]
Trade and Other Receivables [Line Items]
Accounts receivable, net		23,039,023	29,361,303
Employees and officers [member]
Trade and Other Receivables [Line Items]
Accounts receivable, net		5,681,478	6,054,251
Advances to suppliers [member]
Trade and Other Receivables [Line Items]
Accounts receivable, net		1,250,846	2,246,437
Other Current Receivables [member]
Trade and Other Receivables [Line Items]
Accounts receivable, net		$ 82,160	$ 77,694

Accounts Receivable, Net - Sche

Accounts Receivable, Net - Schedule of Breakdown of Accounts Receivable Based on Credit History (Detail) - MXN ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Domestic customers [member]
Trade and Other Receivables [Line Items]
Breakdown of accounts receivable	$ 60,057,141	$ 41,884,579
Domestic customers [member] | 1 to 30 days [member]
Trade and Other Receivables [Line Items]
Breakdown of accounts receivable	10,188,070	1,767,718
Domestic customers [member] | 31 to 60 days [member]
Trade and Other Receivables [Line Items]
Breakdown of accounts receivable	4,081,862	658,456
Domestic customers [member] | 61 to 90 days [member]
Trade and Other Receivables [Line Items]
Breakdown of accounts receivable	777,409	263,447
Domestic customers [member] | More than 90 days [member]
Trade and Other Receivables [Line Items]
Breakdown of accounts receivable	11,345,933	1,016,553
Domestic customers [member] | Past due [member]
Trade and Other Receivables [Line Items]
Breakdown of accounts receivable	26,393,274	3,706,174
Domestic customers [member] | Impaired (reserved) [member]
Trade and Other Receivables [Line Items]
Breakdown of accounts receivable	(951,932)	(458,428)
Domestic customers [member] | Unimpaired [member]
Trade and Other Receivables [Line Items]
Breakdown of accounts receivable	25,441,342	3,247,746
Domestic customers [member] | Current [member]
Trade and Other Receivables [Line Items]
Breakdown of accounts receivable	34,615,799	38,636,833
Export customers [member]
Trade and Other Receivables [Line Items]
Breakdown of accounts receivable	54,428,883	34,859,341
Export customers [member] | 1 to 30 days [member]
Trade and Other Receivables [Line Items]
Breakdown of accounts receivable	334,155	341,184
Export customers [member] | 31 to 60 days [member]
Trade and Other Receivables [Line Items]
Breakdown of accounts receivable		6,824
Export customers [member] | 61 to 90 days [member]
Trade and Other Receivables [Line Items]
Breakdown of accounts receivable		35,372
Export customers [member] | More than 90 days [member]
Trade and Other Receivables [Line Items]
Breakdown of accounts receivable	315,888	624,157
Export customers [member] | Past due [member]
Trade and Other Receivables [Line Items]
Breakdown of accounts receivable	650,043	1,007,537
Export customers [member] | Impaired (reserved) [member]
Trade and Other Receivables [Line Items]
Breakdown of accounts receivable	(272,813)	(374,699)
Export customers [member] | Unimpaired [member]
Trade and Other Receivables [Line Items]
Breakdown of accounts receivable	377,230	632,838
Export customers [member] | Current [member]
Trade and Other Receivables [Line Items]
Breakdown of accounts receivable	$ 54,051,653	$ 34,226,503

Accounts Receivable, Net - Su74

Accounts Receivable, Net - Summary of Reconciliation for Impaired Accounts Receivable (Detail) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Domestic customers [member]
Trade and Other Receivables [Line Items]
Balance at the beginning of the year	$ (458,428)	$ (667,883)
Additions against income	(493,514)	(218,836)
Amount used	10	428,291
Balance at the end of the year	(951,932)	(458,428)
Export customers [member]
Trade and Other Receivables [Line Items]
Balance at the beginning of the year	(374,699)	(312,004)
Additions against income	(204,713)	(25,931)
Amount used	297,047
Translation effects	9,552	(36,764)
Balance at the end of the year	$ (272,813)	$ (374,699)

Inventories, Net - Summary of I

Inventories, Net - Summary of Inventories (Detail) $ in Thousands, $ in Thousands	Dec. 31, 2017USD ($)	Dec. 31, 2017MXN ($)	Dec. 31, 2016MXN ($)
Disclosure of Inventories [Line Items]
Inventories	$ 3,227,366	$ 63,858,930	$ 45,892,060
Refined and petrochemicals products [member]
Disclosure of Inventories [Line Items]
Inventories		27,862,384	21,534,846
Products in transit [member]
Disclosure of Inventories [Line Items]
Inventories		19,112,606	7,735,163
Crude oil [member]
Disclosure of Inventories [Line Items]
Inventories		11,445,780	11,391,310
Materials and products in stock [member]
Disclosure of Inventories [Line Items]
Inventories		5,172,779	4,721,834
Materials in transit [member]
Disclosure of Inventories [Line Items]
Inventories		180,711	419,547
Gas and condesate products [member]
Disclosure of Inventories [Line Items]
Inventories		$ 84,670	$ 89,360

Held-for-sale Non-financial A76

Held-for-sale Non-financial Assets - Additional Information (Detail) - MXN ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Current Nonfinancial Asset Held For Sale [Line Items]
Non-financial assets held for sale reclassified to fixed assets	$ 4,652,314
Non-current assets held for sale [member]
Disclosure Of Current Nonfinancial Asset Held For Sale [Line Items]
Non-financial assets held for sale	$ 2,808,360	$ 7,460,674

Available-For-Sale Non-Current

Available-For-Sale Non-Current Financial Assets - Additional Information (Detail) $ in Thousands, $ in Thousands	Oct. 26, 2017MXN ($)shares	Jun. 07, 2017MXN ($)shares	Jan. 25, 2017MXN ($)shares	Jan. 25, 2017€ / shares	Dec. 14, 2016MXN ($)shares	Jun. 13, 2016MXN ($)shares	Jan. 01, 2016MXN ($)shares	Jan. 15, 2016MXN ($)shares	Aug. 31, 2015MXN ($)shares	Dec. 31, 2017USD ($)	Dec. 31, 2017MXN ($)	Dec. 31, 2016MXN ($)shares	Dec. 31, 2015MXN ($)	Dec. 31, 2017MXN ($)
Disclosure of available for sale financial assets [line items]
Value of non-current financial assets available-for-sale												$ 6,027,540
Loss on sale of financial asset										$ (178,087)	$ (3,523,748)
Other comprehensive income Loss on sale of financial asset										281,206	$ 5,564,130	207,817	$ (3,206,316)
Available-for-sale financial assets										$ 53,416		2,852,679		$ 1,056,918
Held-for-sale current non-financial assets												7,460,674		$ 1,056,918
Short-term Investments [Member]
Disclosure of available for sale financial assets [line items]
Available-for-sale financial assets												$ 2,417,123
Repsol S. A. [member]
Disclosure of available for sale financial assets [line items]
Number of shares held as non-current financial assets available-for-sale | shares							20,724,331	942,015
Value of non-current financial assets available-for-sale							$ 3,944,696	$ 188,490
Percentage of share capital held							1.48%
Repsol S. A. [member] | P.M.I. Holdings, B.V. [member]
Disclosure of available for sale financial assets [line items]
Number of shares held as non-current financial assets available-for-sale | shares		609,539			584,786	555,547			1,497,562			20,724,331
Value of non-current financial assets available-for-sale		$ 180,729			$ 165,346	$ 128,051			$ 435,556			$ 6,027,540
Valuation on the investment at fair value												207,817
Number of shares sold | shares	21,333,870		2,082,348
Average price per share | € / shares				€ 14.17
Value of shares sold	$ 7,342,807		$ 684,029
Loss on sale of financial asset	$ 3,523,748
Other comprehensive income Loss on sale of financial asset												$ 5,564,130

Investments in Joint Ventures78

Investments in Joint Ventures and Associates - Schedule of Investments in Joint Ventures and Associates (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)	Dec. 31, 2017MXN ($)	Dec. 31, 2016MXN ($)	Dec. 31, 2015MXN ($)
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items]
Permanent investments in associates	$ 844,373	$ 16,707,364	$ 20,737,509	$ 24,165,599
Deer Park Refining Limited [member]
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items]
Permanent investments in associates		14,405,542	14,039,384
Percentage of investment	49.99%
Frontera Brownsville, LLC. [member]
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items]
Permanent investments in associates		471,085	478,414
Percentage of investment	50.00%
CH4 Energia, S. A. [member]
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items]
Permanent investments in associates		315,713	194,868
Percentage of investment	50.00%
Texas Frontera, LLC. [member]
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items]
Permanent investments in associates		239,782	260,828
Percentage of investment	50.00%
Petroquimica Mexicana de Vinilo. S. A. de C. V. [member]
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items]
Permanent investments in associates			4,309,050
Percentage of investment	44.09%
Sierrita Gas Pipeline LLC [member]
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items]
Permanent investments in associates		1,084,169	1,112,338
Percentage of investment	35.00%
Administracion Portuaria Integral de Dos Bocas, S.A. de C.V. [member]
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items]
Permanent investments in associates		64,328	139,523
Percentage of investment	40.00%
PMV Minera, S.A. de C.V. [member]
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items]
Permanent investments in associates		45,133	61,779
Percentage of investment	44.09%
Ductos el peninsular, S.A.P.I de C. V. [Member]
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items]
Permanent investments in associates		18,336	18,626
Percentage of investment	50.00%
Other-net [member]
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items]
Permanent investments in associates		$ 63,276	$ 122,699

Investments in Joint Ventures79

Investments in Joint Ventures and Associates - Schedule of Investments in Joint Ventures and Associates (Parenthetical) (Detail) $ in Thousands	Apr. 20, 2016MXN ($)
Petroquimica Mexicana de Vinilo. S. A. de C. V. [member]
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items]
Damages value	$ 461,000

Investments in Joint Ventures80

Investments in Joint Ventures and Associates - Schedule Profit (loss) Sharing in Joint Ventures and Associates (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)	Dec. 31, 2017MXN ($)	Dec. 31, 2016MXN ($)	Dec. 31, 2015MXN ($)
Disclosure of Investments in Associates and Other [Line Items]
Profit (loss) sharing in joint ventures and associates, net	$ 18,216	$ 360,440	$ 2,135,845	$ 2,318,115
Sierrita Gas Pipeline LLC [member]
Disclosure of Investments in Associates and Other [Line Items]
Profit (loss) sharing in joint ventures and associates, net		129,401	105,825	152,445
PMV Minera, S.A. de C.V. [member]
Disclosure of Investments in Associates and Other [Line Items]
Profit (loss) sharing in joint ventures and associates, net		6,253
Petroquimica Mexicana de Vinilo. S. A. de C. V. [member]
Disclosure of Investments in Associates and Other [Line Items]
Profit (loss) sharing in joint ventures and associates, net		(1,223,640)	(190,468)	(61,952)
Administracion Portuaria Integral de Dos Bocas, S.A. de C.V. [member]
Disclosure of Investments in Associates and Other [Line Items]
Profit (loss) sharing in joint ventures and associates, net		(75,195)
Other-net [member]
Disclosure of Investments in Associates and Other [Line Items]
Profit (loss) sharing in joint ventures and associates, net		117,988	144,512	143,782
Compania Mexicana de Exploraciones, S. A. de C. V. [member]
Disclosure of Investments in Associates and Other [Line Items]
Profit (loss) sharing in joint ventures and associates, net				(496,774)
Gasoductos de Chihuahua, S. de R. L. de C. V. [member]
Disclosure of Investments in Associates and Other [Line Items]
Profit (loss) sharing in joint ventures and associates, net			638,126	666,779
Deer Park Refining Limited [member]
Disclosure of Investments in Associates and Other [Line Items]
Profit (loss) sharing in joint ventures and associates, net		920,409	$ 1,437,850	$ 1,913,835
Ductos y Energticos del Norte, S.A. de C.V.[Member]
Disclosure of Investments in Associates and Other [Line Items]
Profit (loss) sharing in joint ventures and associates, net		360,092
CH4 Energia, S. A. [member]
Disclosure of Investments in Associates and Other [Line Items]
Profit (loss) sharing in joint ventures and associates, net		$ 125,132

Investments in Joint Ventures81

Investments in Joint Ventures and Associates - Schedule Profit (loss) Sharing in Joint Ventures and Associates (Parenthetical) (Detail) $ in Thousands, $ in Thousands	Sep. 28, 2016MXN ($)	Nov. 30, 2017USD ($)
Gasoductos de Chihuahua, S. de R. L. de C. V. [member]
Disclosure of Investments in Associates and Other [Line Items]
Divestiture amount	$ 22,684,736
Ownership percentage	50.00%
Profit from divestiture	$ 15,211,039
Profit from divestiture	$ 15,211,039
Ductos y Energticos del Norte, S.A. de C.V.[Member]
Disclosure of Investments in Associates and Other [Line Items]
Divestiture amount		$ 3,141,710
Profit from divestiture		$ 3,139,103
Ownership percentage		50.00%
Profit from divestiture		$ 3,139,103

Investments in Joint Ventures82

Investments in Joint Ventures and Associates - Schedule of Condensed Financial Information of Major Investments Recognized Under the Equity Method (Detail) - MXN ($) $ in Thousands	1 Months Ended	12 Months Ended
	Aug. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Gasoductos de Chihuahua, S. de R. L. de C. V. [member]
Investment In Joint Ventures Accounted For Using Equity Method [Line Items]
Sales and other income	$ 3,798,666			$ 4,617,982
Costs and expenses	2,522,415			3,284,424
Net result	$ 1,276,251			1,333,558
Deer Park Refining Limited [member]
Investment In Joint Ventures Accounted For Using Equity Method [Line Items]
Sales and other income		$ 16,427,064	$ 16,750,155	16,658,705
Costs and expenses		14,586,061	13,874,172	12,830,653
Net result		1,841,003	2,875,983	$ 3,828,052
Sierrita Gas Pipeline LLC [member]
Investment In Joint Ventures Accounted For Using Equity Method [Line Items]
Financial position		3,518,036	3,244,811
Sales and other income		840,414	717,351
Costs and expenses		470,697	414,994
Net result		369,717	302,357
Sierrita Gas Pipeline LLC [member] | Total assets [member]
Investment In Joint Ventures Accounted For Using Equity Method [Line Items]
Financial position		3,518,036	3,244,811
Sierrita Gas Pipeline LLC [member] | Total liabilities [member]
Investment In Joint Ventures Accounted For Using Equity Method [Line Items]
Financial position		420,410	66,703
Sierrita Gas Pipeline LLC [member] | Total equity [member]
Investment In Joint Ventures Accounted For Using Equity Method [Line Items]
Financial position		3,097,626	3,178,108
Deer Park Refining Limited [member]
Investment In Joint Ventures Accounted For Using Equity Method [Line Items]
Financial position		41,075,547	42,428,275
Deer Park Refining Limited [member] | Total assets [member]
Investment In Joint Ventures Accounted For Using Equity Method [Line Items]
Financial position		41,075,547	42,428,275
Deer Park Refining Limited [member] | Total liabilities [member]
Investment In Joint Ventures Accounted For Using Equity Method [Line Items]
Financial position		12,261,581	14,346,643
Deer Park Refining Limited [member] | Total equity [member]
Investment In Joint Ventures Accounted For Using Equity Method [Line Items]
Financial position		$ 28,813,966	$ 28,081,632

Investments in Joint Ventures,

Investments in Joint Ventures, Associates and Other - Additional Information (Detail)	Sep. 28, 2016	Feb. 06, 1997	Jul. 27, 2010	Mar. 31, 1993	Dec. 31, 2016Barrels
Deer Park Refining Limited [member] | PMI NASA [member]
Disclosure of Investments in Associates and Other [Line Items]
Acquired percentage				50.00%
Texas Frontera, LLC. [member]
Disclosure of Investments in Associates and Other [Line Items]
Number of tanks					7
Barrels of capacity					120,000
Texas Frontera, LLC. [member] | PMI SUS [member]
Disclosure of Investments in Associates and Other [Line Items]
Acquired percentage			50.00%
Gasoductos de Chihuahua, S. de R. L. de C. V. [member]
Disclosure of Investments in Associates and Other [Line Items]
Acquired percentage	50.00%
Participation of share capital, percentage		50.00%

Wells, Pipelines, Properties,84

Wells, Pipelines, Properties, Plant and Equipment, Net - Detailed Information About Property, Plant and Equipment (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)	Dec. 31, 2017MXN ($)	Dec. 31, 2016MXN ($)	Dec. 31, 2015MXN ($)
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance		$ 1,667,742,248	$ 1,344,483,631
Acquisitions		93,979,817	155,735,343	$ 264,857,811
Impairment		151,444,560
Ending balance	$ 72,599,743	1,436,509,326	1,667,742,248	1,344,483,631
Gross carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance		3,268,797,613	2,807,149,644
Acquisitions		93,979,818	155,735,343
Reclassifications		(3,920,974)	(332,457)
Impairment		(151,444,560)	331,314,343
Disposals		(51,565,902)	(25,069,260)
Ending balance		3,155,845,995	3,268,797,613	2,807,149,644
Accumulated depreciation and amortization [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance		(1,601,055,365)	(1,462,666,013)
Depreciation and amortization		(156,704,513)	(150,439,491)
Reclassifications		3,920,978	332,458
Disposals		34,502,231	11,717,681
Ending balance		(1,719,336,669)	(1,601,055,365)	(1,462,666,013)
Plants [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance		398,429,131
Ending balance		362,001,214	398,429,131
Plants [member] | Gross carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance		758,446,110	648,412,014
Acquisitions		10,018,030	20,406,464
Reclassifications		3,146,955	150,817
Capitalization		43,033,864	15,943,630
Impairment		(48,020,616)	81,135,967
Disposals		(10,598,983)	(7,602,782)
Ending balance		756,025,360	758,446,110	648,412,014
Plants [member] | Accumulated depreciation and amortization [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance		(360,016,979)	(321,283,906)
Depreciation and amortization		(45,709,123)	(44,549,443)
Reclassifications		2,799,244	(10,521)
Disposals		8,902,711	5,826,891
Ending balance		$ (394,024,147)	(360,016,979)	(321,283,906)
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 [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance		$ 20,326,541
Ending balance		$ 18,429,132	20,326,541
Depreciation rates	5.00%	5.00%
Estimated useful lives	20 Years	20 Years
Drilling equipment [member] | Gross carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance		$ 23,269,116	21,680,343
Acquisitions		418,283	1,629,710
Disposals		(244,283)	(40,937)
Ending balance		23,443,116	23,269,116	21,680,343
Drilling equipment [member] | Accumulated depreciation and amortization [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance		(2,942,575)	(578,015)
Depreciation and amortization		(2,198,867)	(2,364,560)
Disposals		127,458
Ending balance		(5,013,984)	(2,942,575)	(578,015)
Pipelines [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance		307,780,201
Ending balance		321,908,762	307,780,201
Pipelines [member] | Gross carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance		460,145,428	419,979,508
Acquisitions		7,054,793	1,265,011
Reclassifications		(53,349)	(1,268,887)
Capitalization		21,357,074	11,851,378
Impairment		2,226,771	31,967,407
Disposals		(8,862,541)	(3,648,989)
Ending balance		481,868,176	460,145,428	419,979,508
Pipelines [member] | Accumulated depreciation and amortization [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance		(152,365,227)	(139,331,407)
Depreciation and amortization		(15,095,115)	(15,153,879)
Reclassifications		(72,841)	(166,632)
Disposals		7,573,769	2,286,691
Ending balance		$ (159,959,414)	(152,365,227)	(139,331,407)
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		$ 468,286,163
Ending balance		359,348,274	468,286,163
Wells [member] | Gross carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance		1,318,822,917	1,066,515,651
Acquisitions		14,937,882	8,239,480
Reclassifications			8,649,686
Capitalization		36,564,811	40,825,973
Impairment		(83,236,991)	198,974,994
Disposals		(19,340,709)	(4,382,867)
Ending balance		1,267,747,910	1,318,822,917	1,066,515,651
Wells [member] | Accumulated depreciation and amortization [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance		(850,536,754)	(780,443,639)
Depreciation and amortization		(74,673,473)	(70,090,038)
Reclassifications			(3,077)
Disposals		16,810,591
Ending balance		(908,399,636)	(850,536,754)	(780,443,639)
Buildings [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance		23,618,402
Ending balance		23,659,462	23,618,402
Buildings [member] | Gross carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance		62,743,033	66,284,466
Acquisitions		802,300	2,541,802
Reclassifications		98,245	(6,610,184)
Capitalization		1,265,246	1,085,323
Disposals		(208,353)	(558,374)
Ending balance		64,700,471	62,743,033	66,284,466
Buildings [member] | Accumulated depreciation and amortization [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance		(39,124,631)	(37,712,087)
Depreciation and amortization		(1,906,164)	(1,796,383)
Reclassifications		(69,236)	(108,718)
Disposals		59,022	492,557
Ending balance		$ (41,041,009)	(39,124,631)	(37,712,087)
Buildings [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	33 Years	33 Years
Buildings [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	35 Years	35 Years
Offshore platforms [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance		$ 169,542,435
Ending balance		$ 148,222,706	169,542,435
Depreciation rates	4.00%	4.00%
Estimated useful lives	25 Years	25 Years
Offshore platforms [member] | Gross carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance		$ 322,704,205	260,328,096
Acquisitions		7,811,374	9,866,984
Reclassifications		(10,199,213)
Capitalization		8,677,765	17,318,279
Impairment		(15,564,190)	35,640,491
Disposals			(449,645)
Ending balance		313,429,941	322,704,205	260,328,096
Offshore platforms [member] | Accumulated depreciation and amortization [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance		(153,161,770)	(140,908,960)
Depreciation and amortization		(13,192,369)	(12,252,810)
Reclassifications		1,146,904
Ending balance		(165,207,235)	(153,161,770)	(140,908,960)
Furniture and equipment [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance		13,756,021
Ending balance		12,084,714	13,756,021
Furniture and equipment [member] | Gross carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance		50,746,687	52,966,194
Acquisitions		1,183,679	545,271
Reclassifications		(96,899)	(561,569)
Capitalization		30,879	2,769
Impairment			438,979
Disposals		(806,694)	(2,644,957)
Ending balance		51,057,652	50,746,687	52,966,194
Furniture and equipment [member] | Accumulated depreciation and amortization [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance		(36,990,666)	(36,513,479)
Depreciation and amortization		(2,890,563)	(3,205,089)
Reclassifications		102,375	166,914
Disposals		805,916	2,560,988
Ending balance		$ (38,972,938)	(36,990,666)	(36,513,479)
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		$ 13,526,082
Ending balance		16,453,330	13,526,082
Transportation equipment [member] | Gross carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance		19,442,845	15,329,095
Acquisitions		284,445	2,063,519
Reclassifications		(75,674)	(325,778)
Capitalization		3,746,395	2,918,621
Impairment			8,743
Disposals		(226,375)	(551,355)
Ending balance		23,171,636	19,442,845	15,329,095
Transportation equipment [member] | Accumulated depreciation and amortization [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance		(5,916,763)	(5,894,520)
Depreciation and amortization		(1,038,839)	(1,027,289)
Reclassifications		14,532	454,492
Disposals		222,764	550,554
Ending balance		$ (6,718,306)	(5,916,763)	(5,894,520)
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		$ 207,414,148
Ending balance		129,736,382	207,414,148
Construction in progress [member] | Gross carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance		207,414,148	211,675,597
Acquisitions		51,410,469	107,682,868
Reclassifications		(812,943)	(282,044)
Capitalization		(114,700,828)	(89,945,973)
Impairment		(6,849,534)	(16,852,238)
Disposals		(6,724,930)	(4,864,062)
Ending balance		129,736,382	207,414,148	211,675,597
Land [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance		44,571,618
Ending balance		44,546,699	44,571,618
Land [member] | Gross carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance		44,571,618	43,347,802
Acquisitions		58,563	1,487,434
Reclassifications		(560)	50,709
Capitalization		29,248
Disposals		(112,170)	(314,327)
Ending balance		$ 44,546,699	44,571,618	43,347,802
Land [member] | Bottom of range [member]
Disclosure of detailed information about property, plant and equipment [line items]
Estimated useful lives	-	-
Unproductive fixed assets [member] | Gross carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Acquisitions			6,800
Reclassifications			2,039
Disposals			(8,839)
Other Fixed Assets [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance		$ 491,506
Ending balance		118,651	491,506
Other Fixed Assets [member] | Gross carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance		491,506	630,878
Reclassifications		4,072,464	(137,246)
Capitalization		(4,454)
Disposals		(4,440,865)	(2,126)
Ending balance		$ 118,651	$ 491,506	$ 630,878

Wells, Pipelines, Properties,85

Wells, Pipelines, Properties, Plant and Equipment, Net - Detailed Information About Property, Plant and Equipment (Parenthetical) (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)	Dec. 31, 2017MXN ($)	Dec. 31, 2016MXN ($)	Dec. 31, 2015MXN ($)
Disclosure of detailed information about property, plant and equipment [line items]
Financing cost capitalized to fixed assets	$ 5,945,638	$ 117,644,548	$ 98,844,464	$ 67,773,593
Depreciation and amortization		156,704,513	150,439,491	167,951,250
Plugging and abandonment cost		850,015	1,698,312	1,401,870
Provisions for plugging wells		68,797,600	64,967,710
Non-financial assets held for sale reclassified to fixed assets		4,652,314
Transfers from wells unassigned to a reserve		(16,440,645)	(16,393,773)
Net impairment		151,444,560
Net reversal of impairment			(331,314,343)
Pemex exploration and production [member]
Disclosure of detailed information about property, plant and equipment [line items]
Financing cost capitalized to fixed assets		$ 3,060,963	$ 3,667,752	$ 5,258,854

Wells, Pipelines, Properties,86

Wells, Pipelines, Properties, Plant and Equipment, Net - Summary of Net Impairment (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)	Dec. 31, 2017MXN ($)	Dec. 31, 2016MXN ($)	Dec. 31, 2015MXN ($)
Disclosure of detailed information about property, plant and equipment [line items]
Impairment		$ (155,244,350)	$ (19,640,505)
Reversal of impairment		3,799,790	350,954,848
Impairment / (Reversal of impairment)	$ (7,653,856)	(151,444,560)	331,314,343	$ (477,944,690)
Pemex exploration and production [member]
Disclosure of detailed information about property, plant and equipment [line items]
Impairment		(129,350,315)	(16,872,238)
Reversal of impairment			288,581,670
Impairment / (Reversal of impairment)		(129,350,315)	271,709,432
Pemex industrial transformation [member]
Disclosure of detailed information about property, plant and equipment [line items]
Impairment		(19,751,882)	(2,768,267)
Reversal of impairment		3,799,790	55,267,148
Impairment / (Reversal of impairment)		(15,952,092)	52,498,881
AGRO [member]
Disclosure of detailed information about property, plant and equipment [line items]
Impairment		(4,206,653)
Impairment / (Reversal of impairment)		(4,206,653)
Pemex Fertilizers [member]
Disclosure of detailed information about property, plant and equipment [line items]
Impairment		(1,935,500)
Impairment / (Reversal of impairment)		$ (1,935,500)
Pemex Logistics [member]
Disclosure of detailed information about property, plant and equipment [line items]
Reversal of impairment			5,829,520
Impairment / (Reversal of impairment)			5,829,520
Pemex Ethylene [member]
Disclosure of detailed information about property, plant and equipment [line items]
Reversal of impairment			1,276,510
Impairment / (Reversal of impairment)			$ 1,276,510

Wells, Pipelines, Properties,87

Wells, Pipelines, Properties, Plant and Equipment, Net - Additional Information (Detail) $ in Thousands, $ in Thousands, Barrels_per_day in Millions	Jul. 17, 2016USD ($)	Jul. 08, 2016USD ($)	Dec. 31, 2017USD ($)Exchange_Rate	Dec. 31, 2017MXN ($)Barrels_per_dayExchange_Rate	Dec. 31, 2016MXN ($)Barrels_per_dayExchange_Rate	Dec. 31, 2015MXN ($)Exchange_Rate
Disclosure of detailed information about property, plant and equipment [line items]
Impairment loss recognized				$ 155,244,350	$ 19,640,505
Net impairment			$ (7,653,856)	(151,444,560)	331,314,343	$ (477,944,690)
Net reversal of impairment				$ 3,799,790	350,954,848
Net reversal of impairment					(331,314,343)
Leases expire year			2,018	2,018
Leases expire on various dates			Over the next 10 years.	Over the next 10 years.
Capitalized interest expense from capital leases				$ 418,883	$ 500,654	$ 450,760
Discount rates on calculation of capitalized leases in nominal terms				7.96%	7.96%	7.96%
Discount rates on calculation of capitalized leases in real terms				1.11%	4.45%	5.71%
Total investment in contract				$ 45,230,000
Logistics [member]
Disclosure of detailed information about property, plant and equipment [line items]
Useful life					5 years
Value of proved asset					$ 139,436,715
Discount rate					12.63%
Two thousand seventeen to two thousand twenty one [member]
Disclosure of detailed information about property, plant and equipment [line items]
Total investment in contract				36,520,000
Pro Agroindustria S A [member]
Disclosure of detailed information about property, plant and equipment [line items]
Impairment loss recognized				4,206,653
Cash generating units of fertilizers [member]
Disclosure of detailed information about property, plant and equipment [line items]
Impairment loss recognized				1,935,500
Value of proved asset				$ 2,744,600
Discount rate			9.71%	9.71%
Network infrastructure [member]
Disclosure of detailed information about property, plant and equipment [line items]
Lease back agreements amount	$ 1,100,000	$ 600,000
Pemex exploration and production [member]
Disclosure of detailed information about property, plant and equipment [line items]
Impairment loss recognized				$ 129,350,315	$ 16,872,238
Appreciation rate				4.30%	20.10%
Foreign exchange rate | Exchange_Rate			19.7867	19.7867	20.6640	17.2065
Percentage of increase in discount rate			0.30%	0.30%
Percentage of decrease in crude oil price			7.20%	7.20%
Useful life			25 years	25 years	25 years
Production forecast | Barrels_per_day				7,091	7,092
Net impairment				$ (129,350,315)	$ 271,709,432
Net reversal of impairment					$ 288,581,670
Percentage of contractual area			100.00%	100.00%
Percentage of Production area			70.00%	70.00%
Percentage of contract behalf			33.3333%	33.3333%
Pemex exploration and production [member] | Bottom of range [member]
Disclosure of detailed information about property, plant and equipment [line items]
Useful lives of fixed assets					20 years
Pemex exploration and production [member] | Top of range [member]
Disclosure of detailed information about property, plant and equipment [line items]
Useful lives of fixed assets					25 years
Pemex exploration and production [member] | Licenses [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] | Area two [member]
Disclosure of detailed information about property, plant and equipment [line items]
Percentage of Production area			30.00%	30.00%
Pemex exploration and production [member] | Area eight [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] | Oil fields [member]
Disclosure of detailed information about property, plant and equipment [line items]
Net reversal of impairment					$ 288,581,670
Pemex industrial transformation [member]
Disclosure of detailed information about property, plant and equipment [line items]
Impairment loss recognized				$ 19,751,882	$ 2,768,267
Appreciation rate					20.10%
Foreign exchange rate | Exchange_Rate					20.6640	17.2065
Net impairment				(15,952,092)	$ 52,498,881
Net reversal of impairment				$ 3,799,790	55,267,148
Net reversal of impairment					$ 52,498,881
Pemex industrial transformation [member] | Bottom of range [member]
Disclosure of detailed information about property, plant and equipment [line items]
Discount rate					12.06%
Pemex industrial transformation [member] | Top of range [member]
Disclosure of detailed information about property, plant and equipment [line items]
Discount rate					13.72%
Pemex industrial transformation [member] | Refining [member]
Disclosure of detailed information about property, plant and equipment [line items]
Foreign exchange rate | Exchange_Rate			19.7867	19.7867
Percentage of decrease in discount rate			4.40%	4.40%
Discount rate			11.53%	11.53%
Pemex industrial transformation [member] | Gas [member]
Disclosure of detailed information about property, plant and equipment [line items]
Foreign exchange rate | Exchange_Rate			19.7867	19.7867	20.6640
Percentage of decrease in discount rate			4.50%	4.50%
Discount rate			10.24%	10.24%	10.72%
Pemex industrial transformation [member] | Petrochemicals [member]
Disclosure of detailed information about property, plant and equipment [line items]
Foreign exchange rate | Exchange_Rate			19.7867	19.7867		20.6640
Percentage of decrease in discount rate			5.60%	5.60%
Discount rate			9.71%	9.71%		10.29%
Pemex industrial transformation [member] | Matapionche Processor Center [member]
Disclosure of detailed information about property, plant and equipment [line items]
Impairment loss recognized					$ 65,105
Pemex industrial transformation [member] | Cangrejera Petrochemical Center [member]
Disclosure of detailed information about property, plant and equipment [line items]
Impairment loss recognized					2,590,870
Net reversal of impairment				$ 3,565,355
Pemex industrial transformation [member] | Independencia Petrochemical Center [member]
Disclosure of detailed information about property, plant and equipment [line items]
Impairment loss recognized					112,292
Net reversal of impairment				112,292
Pemex industrial transformation [member] | Arenque gas processor complex [member]
Disclosure of detailed information about property, plant and equipment [line items]
Net reversal of impairment				$ 57,039	268,161
Pemex Logistics [member]
Disclosure of detailed information about property, plant and equipment [line items]
Net impairment					5,829,520
Net reversal of impairment					5,829,520
Pemex Ethylene [member]
Disclosure of detailed information about property, plant and equipment [line items]
Net impairment					$ 1,276,510
Discount rate					10.29%
Net reversal of impairment					$ 1,276,510
BHP Billiton [member] | Licenses [member]
Disclosure of detailed information about property, plant and equipment [line items]
Percentage of contractual area			60.00%	60.00%
Chevron [member]
Disclosure of detailed information about property, plant and equipment [line items]
Percentage of contract behalf			33.3334%	33.3334%
Inpex [member]
Disclosure of detailed information about property, plant and equipment [line items]
Percentage of contract behalf			33.3333%	33.3333%

Wells, Pipelines, Properties,88

Wells, Pipelines, Properties, Plant and Equipment, Net - Assumptions to Determine Net Present Value of Reserves Long Lived Assets (Detail)	12 Months Ended
	Dec. 31, 2017USD ($)Exchange_Rate	Dec. 31, 2016USD ($)Exchange_Rate	Dec. 31, 2015Exchange_Rate	Dec. 31, 2017MXN ($)	Dec. 31, 2016MXN ($)
Pemex industrial transformation [member]
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Rate of U.S. dollar | Exchange_Rate		20.6640	17.2065
Pemex exploration and production [member]
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Average crude oil price	$ 55.89	$ 60.24
Average gas price	4.92	4.69
Average condensates price	$ 38.33	$ 40.22
Discount rate	14.40%	14.36%
Refined Products [member] | Pemex industrial transformation [member]
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Average crude oil price		$ 52.30
Processed volume					$ 1,100
Useful lives of the cash generating units		Average of 14 years
Rate of U.S. dollar | Exchange_Rate		20.6640
Discount rate		12.06%
Period		2018-2034
Gas [member] | Pemex industrial transformation [member]
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Processed volume				$ 3,085	$ 3,085
Useful lives of the cash generating units	Average of 9 years	Average of 10 years
Rate of U.S. dollar | Exchange_Rate	19.7867	20.6640
Discount rate	10.24%	10.72%
Period	2018-2029	2018-2029
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	Average of 6 years		Average of 4 years
Rate of U.S. dollar | Exchange_Rate	19.7867		20.6640
Discount rate	9.71%		10.29%
Period	2016-2024		2016-2024
Refining [member] | Pemex industrial transformation [member]
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Average crude oil price	$ 51.30
Processed volume				$ 767
Useful lives of the cash generating units	Average of 16 years
Rate of U.S. dollar | Exchange_Rate	19.7867
Discount rate	11.53%
Period	2018-2034

Wells, pipelines, properties,89

Wells, pipelines, properties, plant and equipment, net - Summary of Impairment in Cash Generating Units (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)	Dec. 31, 2017MXN ($)	Dec. 31, 2016MXN ($)	Dec. 31, 2015MXN ($)
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]
Total impairment of assets		$ (155,244,350)	$ (19,640,505)
Net impairment	$ (7,653,856)	(151,444,560)	331,314,343	$ (477,944,690)
Arenque gas processor complex		3,799,790	350,954,848
Pemex industrial transformation [member]
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]
Total impairment of assets		(19,751,882)	(2,768,267)
Net impairment		(15,952,092)	52,498,881
Arenque gas processor complex		3,799,790	55,267,148
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]
Total impairment of assets		(5,691,005)
Arenque gas processor complex			33,165,095
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]
Total impairment of assets		(8,480,880)
Arenque gas processor complex			21,833,892
Pemex industrial transformation [member] | Arenque gas processor complex [member]
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]
Arenque gas processor complex		57,039	268,161
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]
Total impairment of assets			(2,590,870)
Arenque gas processor complex		3,565,355
Pemex industrial transformation [member] | Independencia Petrochemical Center [member]
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]
Total impairment of assets			(112,292)
Arenque gas processor complex		112,292
Pemex industrial transformation [member] | Matapionche Petrochemical Center [member]
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]
Total impairment of assets			$ (65,105)
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]
Total impairment of assets		(5,579,997)
Pemex industrial transformation [member] | Matapionche Gas Processor Complex [Member]
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]
Arenque gas processor complex		$ 65,104

Wells, pipelines, properties,90

Wells, pipelines, properties, plant and equipment, net - Summary of Impairment or Reversal of Impairment of Fixed Assets (Detail) - Pemex industrial transformation [member] - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
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	$ 79,053,642	$ 119,069,595
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	32,531,925	43,856,284
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	11,420,952	33,961,120
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	12,051,597	36,057,410
Cangrejera Petrochemical Center [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	17,544,825	2,441,686
Independencia Petrochemical Center [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	3,146,413	1,706,687
Arenque gas 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	1,283,201	473,499
Matapionche Gas 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	$ 1,074,729	$ 572,909

Wells, Pipelines, Properties,91

Wells, Pipelines, Properties, Plant and Equipment, Net - Assets Acquired Through Capital Leases (Detail) - MXN ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Disclosure of acquisitions and disposals [Line Items]
Assets acquired through capital leases	$ 9,446,108	$ 9,867,883
Gross carrying amount [member]
Disclosure of acquisitions and disposals [Line Items]
Assets acquired through capital leases	11,142,197	11,142,197
Accumulated depreciation and amortization [member]
Disclosure of acquisitions and disposals [Line Items]
Assets acquired through capital leases	$ (1,696,089)	$ (1,274,314)

Wells, Pipelines, Properties,92

Wells, Pipelines, Properties, Plant and Equipment, Net - Summary of Maturity Analysis of Finance Lease Payables (Detail) - Dec. 31, 2017 $ in Thousands, $ in Thousands	USD ($)	MXN ($)
Disclosure Of Maturity Analysis Of Finance Lease Payables [Line Items]
Finance lease payables	$ 444,540	$ 8,795,954
Less: short-term unaccrued interest	16,749	331,412
Less: long-term unaccrued interest	42,630	843,480
Total capital leases	385,161	7,621,062
Less: current portion of leases (excluding interest)	78,026	1,543,881
Total long-term capital leases	307,135	6,077,181
2017 [member]
Disclosure Of Maturity Analysis Of Finance Lease Payables [Line Items]
Finance lease payables	94,377	1,867,411
2018 [member]
Disclosure Of Maturity Analysis Of Finance Lease Payables [Line Items]
Finance lease payables	60,268	1,192,496
2019 [member]
Disclosure Of Maturity Analysis Of Finance Lease Payables [Line Items]
Finance lease payables	60,268	1,192,496
2020 [member]
Disclosure Of Maturity Analysis Of Finance Lease Payables [Line Items]
Finance lease payables	60,268	1,192,496
2021 [member]
Disclosure Of Maturity Analysis Of Finance Lease Payables [Line Items]
Finance lease payables	60,268	1,192,496
2022 and thereafter [member]
Disclosure Of Maturity Analysis Of Finance Lease Payables [Line Items]
Finance lease payables	$ 109,091	$ 2,158,559

Wells, Pipelines, Properties,93

Wells, Pipelines, Properties, Plant and Equipment, Net - Consolidated and Separate Financial Statements (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)	Dec. 31, 2017MXN ($)	Dec. 31, 2016MXN ($)	Dec. 31, 2015MXN ($)	Dec. 31, 2017MXN ($)	Dec. 31, 2016USD ($)	Dec. 31, 2016MXN ($)	Dec. 31, 2014MXN ($)
Sales:
Net sales	$ 70,604,483	$ 1,397,029,719	$ 1,074,093,232	$ 1,161,760,392
Cost of sales	50,751,509	1,004,204,880	865,822,221	891,964,606
Gross income (loss)	12,199,118	241,380,279	539,585,354	(115,971,815)
Other income (loss), net	261,493	5,174,076	22,649,606	(875,487)
Administrative expenses	6,061,620	119,939,454	112,653,533	112,472,095
Operating income (loss)	5,292,708	104,725,231	424,350,187	(154,387,081)
Taxes, duties and other	(16,828,478)	(332,980,041)	(264,521,435)	(331,500,247)
Net income (loss)	(14,193,909)	(280,850,619)	$ (191,144,342)	(712,567,398)
Cash and cash equivalents	4,945,330			109,368,880	$ 97,851,754	$ 8,264,769	$ 163,532,513	$ 117,988,528
Accounts receivable	8,624,239				170,645,234		133,220,527
Total current assets	18,372,255			267,200,497	363,526,290		357,815,923
Wells, pipelines, properties, plant and equipment, net	72,599,743			1,344,483,631	1,436,509,326		1,667,742,248
Total assets	107,749,252			1,775,654,200	2,132,002,114		2,329,886,024
Suppliers	7,073,205				139,955,378		151,649,540
Taxes and duties payable	2,577,740				51,004,960		48,839,595
Total current liabilities	19,666,099			443,407,721	389,127,185		426,189,886
Total liabilities	183,676,636			3,107,330,098	3,634,354,499		3,562,894,171
Equity (deficit), net	$ (75,927,384)			$ (1,331,675,898)	(1,502,352,385)		$ (1,233,008,147)	$ (767,720,854)
Exploration and extraction contracts [member]
Sales:
Net sales		7,009,464
Cost of sales		5,459,264
Gross income (loss)		1,550,200
Other income (loss), net		4,852
Administrative expenses		34,338
Operating income (loss)		1,520,714
Taxes, duties and other		158,347
Net income (loss)		1,362,367
Cash and cash equivalents					45
Accounts receivable					3,144
Total current assets					3,189
Wells, pipelines, properties, plant and equipment, net					20,475,451
Total assets					20,478,640
Suppliers					796,300
Taxes and duties payable					973
Other current liabilities					8,569
Total current liabilities					805,842
Total liabilities					805,842
Equity (deficit), net					19,672,798
Exploration and extraction contracts [member] | Profit sharing [member] | EK or balam [member]
Sales:
Net sales		7,009,464
Cost of sales		5,447,955
Gross income (loss)		1,561,509
Other income (loss), net		4,852
Administrative expenses		34,338
Operating income (loss)		1,532,023
Taxes, duties and other		158,347
Net income (loss)		1,373,676
Wells, pipelines, properties, plant and equipment, net					14,869,906
Total assets					14,869,906
Suppliers					796,300
Taxes and duties payable					973
Other current liabilities					4,391
Total current liabilities					801,664
Total liabilities					801,664
Equity (deficit), net					14,068,242
Exploration and extraction contracts [member] | Profit sharing [member] | Block two [member]
Sales:
Cost of sales		5,953
Gross income (loss)		(5,953)
Operating income (loss)		(5,953)
Net income (loss)		(5,953)
Cash and cash equivalents					20
Accounts receivable					1,013
Total current assets					1,033
Total assets					1,033
Other current liabilities					1,809
Total current liabilities					1,809
Total liabilities					1,809
Equity (deficit), net					(776)
Exploration and extraction contracts [member] | Profit sharing [member] | Block eight [member]
Sales:
Cost of sales		4,845
Gross income (loss)		(4,845)
Operating income (loss)		(4,845)
Net income (loss)		(4,845)
Cash and cash equivalents					25
Accounts receivable					1,804
Total current assets					1,829
Total assets					1,829
Other current liabilities					2,369
Total current liabilities					2,369
Total liabilities					2,369
Equity (deficit), net					(540)
Exploration and extraction contracts [member] | license [member] | Trion [member]
Sales:
Wells, pipelines, properties, plant and equipment, net					4,498,234
Total assets					4,498,234
Equity (deficit), net					4,498,234
Exploration and extraction contracts [member] | license [member] | Block Three [member]
Sales:
Cost of sales		511
Gross income (loss)		(511)
Operating income (loss)		(511)
Net income (loss)		$ (511)
Accounts receivable					327
Total current assets					327
Wells, pipelines, properties, plant and equipment, net					1,107,311
Total assets					1,107,638
Equity (deficit), net					$ 1,107,638

Intangible Assets - Additional

Intangible Assets - Additional Information (Detail) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of detailed information about intangible assets [abstract]
Intangible assets are wells unassigned	$ 9,088,563	$ 8,639,242	$ 14,304,961
Expenses related to unsuccessful wells	$ 2,500,638	$ 19,307,838

Intangible Assets - Schedule of

Intangible Assets - Schedule of Intangible Assets are Wells Unassigned to a Reserve (Detail) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Wells unassigned to a reserve:
Balance at the beginning of period	$ 8,639,242	$ 14,304,961
Additions to construction in progress	20,553,952	20,526,300
Transfers against expenses	(3,663,986)	(9,798,246)
Transfers against fixed assets	(16,440,645)	(16,393,773)
Balance at the end of period	$ 9,088,563	$ 8,639,242

Long-term Notes Receivable an96

Long-term Notes Receivable and Other Assets - Summary of Long-term Notes Receivable (Detail) - MXN ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Notes Receivable And Other Long Term Assets [Abstract]
Promissory notes issued by the Mexican Government	$ 147,274,076	$ 140,578,871
Other long-term notes receivable	1,218,833	8,028,731
Total long-term notes receivable	$ 148,492,909	$ 148,607,602

Long-term Notes Receivable an97

Long-term Notes Receivable and Other Assets - Summary of Promissory Notes Issued (Detail) - MXN ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Notes Receivable And Other Long Term Assets [Abstract]
Total promissory notes	$ 149,796,282	$ 142,124,620
Less: current portion of notes receivable	2,522,206	1,545,749
Long-term promissory notes	$ 147,274,076	$ 140,578,871

Long-term Notes Receivable an98

Long-term Notes Receivable and Other Assets - Additional Information (Detail) - MXN ($) $ in Thousands	Aug. 15, 2016	Jun. 29, 2016	Dec. 24, 2015	Jun. 30, 2017	Aug. 15, 2016	Dec. 31, 2017	Dec. 31, 2016
Disclosure of notes receivable and other non current assets [line items]
Long-term notes receivable						$ 147,274,076	$ 140,578,871
Promissory notes contibution amount						(2,522,206)	(1,545,749)
Financing income [member]
Disclosure of notes receivable and other non current assets [line items]
Accrued yields						$ 9,233,950	$ 3,597,654
Bottom of range [member]
Disclosure of notes receivable and other non current assets [line items]
Interest per annum of promissory notes						4.65%	4.35%
Top of range [member]
Disclosure of notes receivable and other non current assets [line items]
Interest per annum of promissory notes						7.03%	7.04%
Fondo laboral pemex portfolio [member]
Disclosure of notes receivable and other non current assets [line items]
Maturity				2,017
Fondo laboral pemex portfolio [member] | Federal Government [member]
Disclosure of notes receivable and other non current assets [line items]
Remaining part of promissory note transferred						$ 22,217,300
2017 [member] | Fondo laboral pemex portfolio [member]
Disclosure of notes receivable and other non current assets [line items]
Promissory notes contibution amount				$ 1,562,288
SHCP [member]
Disclosure of notes receivable and other non current assets [line items]
Accrued interest rate			6.93%
Petroleos Mexicanos [member]
Disclosure of notes receivable and other non current 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
Non-negotiable promissory note [member] | SHCP [member]
Disclosure of notes receivable and other non current assets [line items]
Notes issued in advance payment			$ 50,000,000

Long-term Notes Receivable an99

Long-term Notes Receivable and Other Assets - Summary of Promissory Notes Maturity Dates and Annual Rates (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2017MXN ($)Promissory_Notes	Dec. 31, 2016MXN ($)Promissory_Notes
Disclosure of notes receivable and other non current assets [line items]
Total promissory notes	$ 149,796,282	$ 142,124,620
Less: current portion	2,522,206	1,545,749
Long-term notes receivable	147,274,076	140,578,871
4.65% notes due 2018 [member]
Disclosure of notes receivable and other non current assets [line items]
Long-term notes receivable	$ 2,522,206	$ 2,408,634
Number of Promissory Notes | Promissory_Notes	1	1
Maturity	2,018	2,018
Yield Rate Range	4.65%	4.65%
5.14% notes due 2019 [member]
Disclosure of notes receivable and other non current assets [line items]
Long-term notes receivable	$ 3,580,302	$ 3,402,849
Number of Promissory Notes | Promissory_Notes	1	1
Maturity	2,019	2,019
Yield Rate Range	5.14%	5.14%
5.39% notes due 2020 [member]
Disclosure of notes receivable and other non current assets [line items]
Long-term notes receivable	$ 4,421,320	$ 4,192,132
Number of Promissory Notes | Promissory_Notes	1	1
Maturity	2,020	2,020
Yield Rate Range	5.39%	5.39%
5.57% notes due 2021 [member]
Disclosure of notes receivable and other non current assets [line items]
Long-term notes receivable	$ 5,238,081	$ 4,957,840
Number of Promissory Notes | Promissory_Notes	1	1
Maturity	2,021	2,021
Yield Rate Range	5.57%	5.57%
5.74% notes due 2022 [member]
Disclosure of notes receivable and other non current assets [line items]
Long-term notes receivable	$ 5,804,485
Number of Promissory Notes | Promissory_Notes	1
Maturity	2,022
Yield Rate Range	5.74%
5.87% notes and 6.32% notes due 2023 to 2027 [member]
Disclosure of notes receivable and other non current assets [line items]
Long-term notes receivable	$ 34,196,434
Number of Promissory Notes | Promissory_Notes	5
Maturity	2023 to 2027
5.87% notes and 6.32% notes due 2023 to 2027 [member] | Bottom of range [member]
Disclosure of notes receivable and other non current assets [line items]
Yield Rate Range	5.87%
5.87% notes and 6.32% notes due 2023 to 2027 [member] | Top of range [member]
Disclosure of notes receivable and other non current assets [line items]
Yield Rate Range	6.32%
6.47% notes and 6.81% notes due 2028 to 2032 [member]
Disclosure of notes receivable and other non current assets [line items]
Long-term notes receivable	$ 35,338,617
Number of Promissory Notes | Promissory_Notes	5
Maturity	2028 to 2032
6.47% notes and 6.81% notes due 2028 to 2032 [member] | Bottom of range [member]
Disclosure of notes receivable and other non current assets [line items]
Yield Rate Range	6.47%
6.47% notes and 6.81% notes due 2028 to 2032 [member] | Top of range [member]
Disclosure of notes receivable and other non current assets [line items]
Yield Rate Range	6.81%
6.85% notes and 7.03% notes due 2033 to 2037 [member]
Disclosure of notes receivable and other non current assets [line items]
Long-term notes receivable	$ 32,789,697
Number of Promissory Notes | Promissory_Notes	5
Maturity	2033 to 2037
6.85% notes and 7.03% notes due 2033 to 2037 [member] | Bottom of range [member]
Disclosure of notes receivable and other non current assets [line items]
Yield Rate Range	6.85%
6.85% notes and 7.03% notes due 2033 to 2037 [member] | Top of range [member]
Disclosure of notes receivable and other non current assets [line items]
Yield Rate Range	7.03%
7.02% notes and 6.94% notes due 2038 to 2042 [member]
Disclosure of notes receivable and other non current assets [line items]
Long-term notes receivable	$ 25,905,140
Number of Promissory Notes | Promissory_Notes	5
Maturity	2038 to 2042
7.02% notes and 6.94% notes due 2038 to 2042 [member] | Bottom of range [member]
Disclosure of notes receivable and other non current assets [line items]
Yield Rate Range	7.02%
7.02% notes and 6.94% notes due 2038 to 2042 [member] | Top of range [member]
Disclosure of notes receivable and other non current assets [line items]
Yield Rate Range	6.94%
4.35% notes due 2017 [member]
Disclosure of notes receivable and other non current assets [line items]
Long-term notes receivable		$ 1,545,749
Number of Promissory Notes | Promissory_Notes		1
Maturity		2,017
Yield Rate Range		4.35%
4.74% notes and 6.11% notes due 2022 to 2026 [member]
Disclosure of notes receivable and other non current assets [line items]
Long-term notes receivable		$ 30,986,252
Number of Promissory Notes | Promissory_Notes		5
Maturity		2022 to 2026
4.74% notes and 6.11% notes due 2022 to 2026 [member] | Bottom of range [member]
Disclosure of notes receivable and other non current assets [line items]
Yield Rate Range		4.74%
4.74% notes and 6.11% notes due 2022 to 2026 [member] | Top of range [member]
Disclosure of notes receivable and other non current assets [line items]
Yield Rate Range		6.11%
6.32% and 6.77% notes due 2027 and 2031 [member]
Disclosure of notes receivable and other non current assets [line items]
Long-term notes receivable		$ 33,280,216
Number of Promissory Notes | Promissory_Notes		5
Maturity		2027 to 2031
6.32% and 6.77% notes due 2027 and 2031 [member] | Bottom of range [member]
Disclosure of notes receivable and other non current assets [line items]
Yield Rate Range		6.32%
6.32% and 6.77% notes due 2027 and 2031 [member] | Top of range [member]
Disclosure of notes receivable and other non current assets [line items]
Yield Rate Range		6.77%
6.81% notes to 7% notes due 2032 to 2036 [member]
Disclosure of notes receivable and other non current assets [line items]
Long-term notes receivable		$ 31,370,504
Number of Promissory Notes | Promissory_Notes		5
Maturity		2032 to 2036
6.81% notes to 7% notes due 2032 to 2036 [member] | Bottom of range [member]
Disclosure of notes receivable and other non current assets [line items]
Yield Rate Range		6.81%
6.81% notes to 7% notes due 2032 to 2036 [member] | Top of range [member]
Disclosure of notes receivable and other non current assets [line items]
Yield Rate Range		7.00%
6.94% and 7.04% notes due 2037 and 2042 [member]
Disclosure of notes receivable and other non current assets [line items]
Long-term notes receivable		$ 29,980,444
Number of Promissory Notes | Promissory_Notes		6
Maturity		2037 to 2042
6.94% and 7.04% notes due 2037 and 2042 [member] | Bottom of range [member]
Disclosure of notes receivable and other non current assets [line items]
Yield Rate Range		6.94%
6.94% and 7.04% notes due 2037 and 2042 [member] | Top of range [member]
Disclosure of notes receivable and other non current assets [line items]
Yield Rate Range		7.04%

Long-term Notes Receivable a100

Long-term Notes Receivable and Other Assets - Summary of Other Assets (Detail) $ in Thousands, $ in Thousands	Dec. 31, 2017USD ($)	Dec. 31, 2017MXN ($)	Dec. 31, 2016MXN ($)
Disclosure Of Notes Receivable And Other Long Term Assets [Abstract]
Payments in advance		$ 4,683,117	$ 2,558,767
License		2,162,151	1,813,605
Rights-of-way		1,967,304	1,940,157
Other		2,672,605	3,200,116
Total other assets	$ 580,449	$ 11,485,177	$ 9,512,645

Debt - Additional Information (

Debt - Additional Information (Detail) € in Thousands, ¥ in Thousands, SFr in Thousands

Dec. 21, 2017USD ($)

Dec. 18, 2017USD ($)

Dec. 15, 2017USD ($)

Nov. 16, 2017MXN ($)

Jul. 08, 2016USD ($)

Jun. 17, 2016USD ($)

Feb. 05, 2016MXN ($)

Dec. 31, 2017USD ($)

Jul. 17, 2017USD ($)

May 15, 2017USD ($)

Dec. 31, 2017USD ($)

Dec. 31, 2017MXN ($)

Dec. 31, 2016MXN ($)

Dec. 31, 2015MXN ($)

Feb. 18, 2018USD ($)

Dec. 31, 2017MXN ($)

Jul. 21, 2017USD ($)

Jul. 18, 2017USD ($)

Jul. 14, 2017USD ($)

Jun. 16, 2017USD ($)

Jun. 15, 2017USD ($)

May 24, 2017USD ($)

Feb. 14, 2017EUR (€)

Dec. 31, 2016USD ($)

Dec. 31, 2016MXN ($)

Dec. 14, 2016USD ($)

Dec. 13, 2016USD ($)

Dec. 06, 2016USD ($)

Nov. 17, 2016USD ($)

Nov. 17, 2016MXN ($)

Oct. 03, 2016USD ($)

Sep. 21, 2016USD ($)

Jul. 26, 2016CNY (¥)

Jun. 14, 2016CHF (SFr)

Apr. 19, 2016EUR (€)

Mar. 28, 2016MXN ($)

Mar. 23, 2016MXN ($)

Mar. 17, 2016MXN ($)

Mar. 15, 2016USD ($)

Mar. 15, 2016EUR (€)

Feb. 04, 2016USD ($)

Jan. 25, 2016USD ($)

Nov. 18, 2015USD ($)

Nov. 18, 2015MXN ($)

Disclosure of debt [Line Items]

Internal net debt

$ 28,000,000,000

$ 110,500,000,000

External net debt

7,100,000,000

$ 8,500,000,000

Total amount of net debt

$ 8,055,900,000

$ 150,000,000,000

$ 15,722,000,000

$ 240,550,000,000

Debt securities issued

$ 4,000,000,000

Line of credit

$ 5,400,000,000

$ 5,400,000,000

$ 23,500,000,000

$ 4,630,000,000

$ 3,500,000,000

Principal amount of debt

2,001,742,870,000

1,948,366,564,000

Repayment of revolving credit lines

32,342,434,000

$ 642,059,819,000

$ 614,987,329,000

$ 193,618,498,000

Line of credit to ensure liquidity

$ 6,700,000,000

$ 6,700,000,000

$ 23,500,000,000

4,750,000,000

$ 23,500,000,000

Sale and leaseback of oil and gas products

$ 1,100,000,000

Lease agreement period

15 years

Sale and leaseback of oil and gas products

$ 762,637,362,000

$ 616,380,608,000

$ 690,591,455,000

Madero refinery [member]

Disclosure of debt [Line Items]

Lease agreement period

20 years

Sale and leaseback of oil and gas products

$ 600,000,000

Subsidiaries [member]

Disclosure of debt [Line Items]

Revolving credit facility amount

11,369,800,000

Revolving credit amount outstanding

$ 0

Revolving credit line [member]

Disclosure of debt [Line Items]

Disbursement amount received

$ 1,950,000,000

Series C medium term notes program [member]

Disclosure of debt [Line Items]

Debt securities issued

$ 92,000,000,000

Fixed rate [member]

Disclosure of debt [Line Items]

Interest rate

8.38%

5.11%

Line of credit | €

€ 500,000

Maturity date

March 2,023

March 2,023

Floating rate [member]

Disclosure of debt [Line Items]

Line of credit

$ 300,000,000

Maturity date

December 2,019

December 2,019

Floating rate [member] | TIIE [member]

Disclosure of debt [Line Items]

Interest rate

0.55%

Maturity

March 2,017

March 2,017

Line of credit

$ 7,000,000,000,000

$ 9,700,000,000

Maturity date

January 2,017

Floating rate [member] | TIIE [member] | Certificados Bursatiles [member]

Disclosure of debt [Line Items]

Debt securities issued

$ 5,000,000,000

Maturity

October 2,019

October 2,019

Three point seven five percentage notes due two thousand twenty five [member]

Disclosure of debt [Line Items]

Debt securities issued

$ 450,000,000

Interest rate

3.75%

Maturity

2,025

5.25% notes due April 6, 2024 [member] | Fixed rate [member] | Non-revolving credit facility [member]

Disclosure of debt [Line Items]

Interest rate

5.25%

5.25%

5.25%

Maturity

April 6, 2024

Line of credit

$ 132,000,000

$ 132,000,000

1.65 basis point due May 2020 [member] | Simple credit line [member]

Disclosure of debt [Line Items]

Maturity

May 2,020

Line of credit

$ 400,000,000

$ 200,000,000

$ 200,000,000

Interest rate basis description

Floating interest rate linked to LIBOR plus 165 basis points

Interest rate

1.65%

6.50% notes due 2027 [member] | Series C medium term notes program [member]

Disclosure of debt [Line Items]

Debt securities issued

$ 2,500,000,000

Interest rate

6.50%

6.750% bonds due 2047 [member]

Disclosure of debt [Line Items]

Interest rate

6.75%

Principal amount of debt

$ 1,491,941,000

Principal amount of debt exchanged

$ 8,059,000

6.750% bonds due 2047 [member] | Series C medium term notes program [member]

Disclosure of debt [Line Items]

Debt securities issued

$ 2,500,000,000

Interest rate

6.75%

5.750% note due to 2018 [member]

Disclosure of debt [Line Items]

Interest rate

5.75%

Principal amount of debt purchased

$ 922,485,000

3.500% notes due to 2018 [member]

Disclosure of debt [Line Items]

Interest rate

3.50%

Principal amount of debt

$ 644,374,000

3.125% notes due to 2019 [member]

Disclosure of debt [Line Items]

Interest rate

3.125%

Principal amount of debt

$ 172,591,000

One seven five basis point due two thousand twenty two [member] | Bilateral Credit Line [member]

Disclosure of debt [Line Items]

Maturity

2,022

Line of credit

$ 300,000,000

Interest rate basis description

LIBOR plus 175 basis points

Interest rate

1.75%

8.000% notes due 2019 [member]

Disclosure of debt [Line Items]

Interest rate

8.00%

Principal amount of debt purchased

$ 687,725,000

5.750% notes due 2018 [member]

Disclosure of debt [Line Items]

Interest rate

5.75%

Principal amount of debt purchased

$ 657,050,000

Principal amount of debt exchanged

$ 73,288,000

4.625% notes due 2023 [member]

Disclosure of debt [Line Items]

Interest rate

4.625%

Principal amount of debt exchanged

$ 69,302,000

5.500% bonds due 2044 [member]

Disclosure of debt [Line Items]

Interest rate

5.50%

Principal amount of debt

$ 1,591,961,000

Two five zero basis point due two thousand eighteen [member]

Disclosure of debt [Line Items]

Maturity

2,018

Line of credit

$ 390,000,000

Interest rate basis description

LIBOR plus 250 basis points on a quarterly basis

Interest rate

2.50%

Line of credit prepaying amount

$ 140,000,000

Two five zero basis point due two thousand eighteen [member] | New Credit Line [member]

Disclosure of debt [Line Items]

Line of credit

$ 250,000,000

One six five basis point due two thousand twenty [member] | Bilateral Credit Line [member]

Disclosure of debt [Line Items]

Maturity

2,020

Line of credit

$ 200,000,000

Interest rate basis description

LIBOR plus 165 basis points

Interest rate

1.65%

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

Disclosure of debt [Line Items]

Revolving credit facility amount

15,141,500,000

15,141,500,000

Repayment of revolving credit lines

14,914,000,000

Revolving credit amount outstanding

$ 227,500,000

$ 227,500,000

Bottom of range [member]

Disclosure of debt [Line Items]

Debt securities issued

$ 62,000,000,000

Bottom of range [member] | Floating rate [member] | TIIE [member]

Disclosure of debt [Line Items]

Line of credit

$ 2,000,000,000

Top of range [member]

Disclosure of debt [Line Items]

Debt securities issued

$ 72,000,000,000

Top of range [member] | Floating rate [member] | TIIE [member]

Disclosure of debt [Line Items]

Line of credit

$ 3,300,000,000

Series C medium term notes program [member]

Disclosure of debt [Line Items]

Debt securities issued

$ 92,000,000,000

$ 92,000,000,000

$ 72,000,000,000

€ 4,250,000

$ 5,500,000,000

$ 62,000,000,000

SFr 375,000

$ 62,000,000,000

€ 2,250,000

$ 5,000,000,000

Principal amount of debt

4,000,000,000

Series C medium term notes program [member] | Three point seven five percentage notes due two thousand twenty five [member]

Disclosure of debt [Line Items]

Debt securities issued

$ 92,000,000,000

Series C medium term notes program [member] | 1.50% notes due to June 2018 [member]

Disclosure of debt [Line Items]

Debt securities issued | SFr

SFr 225,000

Interest rate

1.50%

Maturity

June 2,018

June 2,018

Series C medium term notes program [member] | 2.35% notes due to December 2021 [member]

Disclosure of debt [Line Items]

Debt securities issued | SFr

SFr 150,000

Interest rate

2.35%

Maturity

December 2,021

December 2,021

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

Disclosure of debt [Line Items]

Debt securities issued

$ 2,000,000,000

Interest rate

4.625%

Maturity

September 2,023

September 2,023

Series C medium term notes program [member] | 6.750% bonds due to September 2047 [member]

Disclosure of debt [Line Items]

Debt securities issued

$ 2,000,000,000

Interest rate

6.75%

Maturity

September 2,047

September 2,047

Series C medium term notes program [member] | 2.50% notes due August 2021 [member]

Disclosure of debt [Line Items]

Debt securities issued | €

€ 1,750,000

Interest rate

2.50%

Maturity

August 2,021

August 2,021

Series C medium term notes program [member] | 3.75% notes due February 2024 [member]

Disclosure of debt [Line Items]

Debt securities issued | €

€ 1,250,000

Interest rate

3.75%

Maturity

February 2,024

February 2,024

Series C medium term notes program [member] | 4.875% notes due February 2028 [member]

Disclosure of debt [Line Items]

Debt securities issued | €

€ 1,250,000

Interest rate

4.875%

Maturity

February 2,028

February 2,028

Series C medium term notes program [member] | 5.500% notes due February 2019 [member]

Disclosure of debt [Line Items]

Debt securities issued

$ 750,000,000

Interest rate

5.50%

Maturity

February 2,019

February 2,019

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

Disclosure of debt [Line Items]

Debt securities issued

$ 1,250,000,000

Interest rate

6.375%

Maturity

February 2,021

February 2,021

Series C medium term notes program [member] | 6.875% notes due August 2026 [member]

Disclosure of debt [Line Items]

Debt securities issued

$ 3,000,000,000

Interest rate

6.875%

Maturity

August 2,026

August 2,026

Series C medium term notes program [member] | 3.750% Notes due to March 2019 [member]

Disclosure of debt [Line Items]

Debt securities issued | €

€ 1,350,000

Interest rate

3.75%

3.75%

Maturity

March 2,019

March 2,019

Series C medium term notes program [member] | 5.125% Notes due to March 2023 [member]

Disclosure of debt [Line Items]

Debt securities issued | €

€ 900,000

Interest rate

5.125%

5.125%

Maturity

March 2,023

March 2,023

Series C medium term notes program [member] | 6.50% due March 2027 [member] | Fixed rate [member]

Disclosure of debt [Line Items]

Debt securities issued

$ 3,000,000,000

Interest rate

6.50%

Maturity

March 2,027

March 2,027

Series C medium term notes program [member] | 5.375% due March 2022 [member] | Fixed rate [member]

Disclosure of debt [Line Items]

Debt securities issued

$ 1,500,000,000

Interest rate

5.375%

Series C medium term notes program [member] | Notes due March 2022 [member] | Floating rate [member]

Disclosure of debt [Line Items]

Debt securities issued

$ 1,000,000,000

Maturity

March 2,022

March 2,022

Series C medium term notes program [member] | Bottom of range [member]

Disclosure of debt [Line Items]

Debt securities issued

$ 52,000,000,000

Series C medium term notes program [member] | Top of range [member]

Disclosure of debt [Line Items]

Debt securities issued

$ 62,000,000,000

Bond securities [member]

Disclosure of debt [Line Items]

Debt securities issued | ¥

¥ 80,000,000

Interest rate

0.54%

Maturity

July 2,026

July 2,026

Debt - Summary of Long-term Deb

Debt - Summary of Long-term Debt (Detail) € in Thousands, ¥ in Thousands, $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Dec. 31, 2017MXN ($)	Dec. 31, 2017EUR (€)	Dec. 31, 2017JPY (¥)	Dec. 31, 2016MXN ($)	Dec. 31, 2016EUR (€)	Dec. 31, 2016JPY (¥)	Dec. 31, 2015MXN ($)
Disclosure of detailed information about borrowings [line items]
Total principal in pesos			$ 2,001,742,870			$ 1,948,366,564
Plus: accrued interest			32,078,624			27,815,467
Notes payable to contractors			4,053,577			6,988,699
Total			2,037,875,071			1,983,170,730
Less: short-term maturities			122,957,558			144,169,619
Current portion of notes payable to contractors			2,173,285			4,181,102
Accrued interest			32,078,624			27,815,467
Total short-term debt and current portion of long-term debt						176,166,188
Borrowings	$ 95,046,956		1,880,665,604			1,807,004,542			$ 1,300,873,167
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			57,197,211			53,703,421
U.S [member]
Disclosure of detailed information about borrowings [line items]
Borrowings	$ 68,519,829	$ 64,951,144	1,355,781,294			1,342,150,436
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 3.125% to 9.5% and LIBOR plus 0.35% to 2.02%
Maturity	Various to 2047	Various to 2046
Borrowings	$ 57,556,097	$ 54,751,738	1,138,845,231			1,131,389,914
U.S [member] | Purchasing loans [member]
Disclosure of detailed information about borrowings [line items]
Rate of interest	LIBOR plus 0.85%	LIBOR plus 0.8% to 0.85%
Maturity	Various to 2018	Various to 2016
Borrowings	$ 1,300,000	$ 120,000	25,722,710			2,479,680
U.S [member] | Project Finance [member]
Disclosure of detailed information about borrowings [line items]
Rate of interest	Fixed from 2.35% to 3.81% and LIBOR plus 0.24% to 1.75%	Fixed from 2.35% to 5.45% and LIBOR plus 0.01% to 1.71%
Maturity	Various to 2025	Various to 2021
Borrowings	$ 3,283,741	$ 4,099,481	64,974,389			84,711,684
U.S [member] | Direct loans [member]
Disclosure of detailed information about borrowings [line items]
Rate of interest	Fixed from 5.25% to 5.44% and LIBOR plus 1.65%	Fixed at 5.44% and LIBOR plus 1.0%
Maturity	Various to 2020	Various to 2018
Borrowings	$ 2,180,315	$ 1,601,848	43,141,231			33,100,587
U.S [member] | Syndicated loan [member]
Disclosure of detailed information about borrowings [line items]
Rate of interest	LIBOR plus 0.85%	LIBOR plus 0.85%
Maturity	Various to 2020	Various to 2020
Borrowings	$ 1,988,597	$ 1,986,865	39,347,774			41,056,571
U.S [member] | Bank loans [member]
Disclosure of detailed information about borrowings [line items]
Rate of interest	Fixed from 3.5% to 5.28%	Fixed from 3.5% to 5.28%
Maturity	Various to 2023	Various to 2023
Borrowings	$ 174,442	$ 210,019	3,451,629			4,339,826
U.S [member] | Finance Lease [member]
Disclosure of detailed information about borrowings [line items]
Rate of interest	Fixed from 0.38% to 1.99%	Fixed from 0.38% to 1.99%
Maturity	Various to 2025	Various to 2025
Borrowings	$ 385,161	$ 462,595	7,621,062			9,559,060
U.S [member] | Lease-back [member]
Disclosure of detailed information about borrowings [line items]
Rate of interest	Fixed from 0.45% to 0.7%	Fixed from 0.45% to 0.7%
Maturity	Various to 2036	Various to 2036
Borrowings	$ 1,651,476	$ 1,718,598	32,677,268			35,513,114
EURO [member]
Disclosure of detailed information about borrowings [line items]
Borrowings			299,265,574	€ 12,598,056		207,153,216	€ 9,558,388
EURO [member] | Bonds [member]
Disclosure of detailed information about borrowings [line items]
Rate of interest	Fixed from 1.875% to 5.5%	Fixed from 3.125% to 6.375%
Maturity	Various to 2030	Various to 2030
Borrowings			287,386,195	12,097,975		196,317,016	9,058,388
EURO [member] | Project Finance [member]
Disclosure of detailed information about borrowings [line items]
Rate of interest	Fixed from 2.1% to 5.11%	Fixed at 2%
Maturity	Various to 2023	Various to 2016
Borrowings			11,879,379	€ 500,081		10,836,200	€ 500,000
Japan, Yen [member]
Disclosure of detailed information about borrowings [line items]
Borrowings						31,318,032		¥ 176,728,356
Japan, Yen [member] | Bonds [member]
Disclosure of detailed information about borrowings [line items]
Rate of interest	Fixed from 0.54% to 3.5% and LIBOR yen plus 0.75%	Fixed at 3.5% and LIBOR yen plus 0.75%
Maturity	Various to 2026	Various to 2023
Borrowings			30,541,407		¥ 173,827,018	30,800,746		173,809,300
Japan, Yen [member] | Project Finance [member]
Disclosure of detailed information about borrowings [line items]
Rate of interest		Fixed at 1.56% and Prime Rate yen plus 2.56%
Maturity		Various to 2017
Borrowings						517,286		¥ 2,919,056
Mexico, Pesos [member]
Disclosure of detailed information about borrowings [line items]
Borrowings			211,808,448			277,254,794
Mexico, Pesos [member] | Direct loans [member]
Disclosure of detailed information about borrowings [line items]
Rate of interest	Fixed at 6.55% and TIIE plus 0.85% to 1.25%	Fixed at 6.55% and TIIE plus 0.55% to 1.25%
Maturity	Various to 2025	Various to 2025
Borrowings			28,597,423			45,563,848
Mexico, Pesos [member] | 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			33,646,107			38,538,961
Mexico, Pesos [member] | Certificados Bursatiles [member]
Disclosure of detailed information about borrowings [line items]
Rate of interest	Mexican Government Treasury Certificates ("Cetes") , TIIE(1) less 0.06% to 1.35%, and fixed at 7.19% to 9.1%	Mexican Government Treasury Certificates ("Cetes") , TIIE(1) less 0.06% to 0.35%, and fixed at 7.19% to 9.15%
Maturity	Various to 2026	Various to 2026
Borrowings			149,564,918			173,151,985
Mexico, Pesos [member] | Revolved loans [member]
Disclosure of detailed information about borrowings [line items]
Rate of interest		TIIE plus 0.55
Maturity		To 2,016
Borrowings						20,000,000
Other Currencies [member] | Bonds [member]
Disclosure of detailed information about borrowings [line items]
Rate of interest	Fixed from 1.5% to 8.25%	Fixed from 2.5% to 8.25%
Maturity	Various to 2025	Various to 2022
Borrowings			$ 47,148,936			$ 36,786,665

Debt - Summary of Long-term 103

Debt - Summary of Long-term Debt (Parenthetical) (Detail) - MXN ($) $ in Thousands	1 Months Ended		3 Months Ended		6 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Disclosure of detailed information about borrowings [line items]
Loan from foreign banks	$ 1,701,363,406	$ 1,600,968,832	$ 1,701,363,406	$ 1,600,968,832	$ 1,701,363,406	$ 1,600,968,832
LIBOR [member]
Disclosure of detailed information about borrowings [line items]
Interest rates			1.69428%	0.99789%	1.83707%	1.31767%
TIIE Rate [member]
Disclosure of detailed information about borrowings [line items]
Interest rates	7.6241%	6.1066%	7.6556%	6.1875%
Cetes Rate [member]
Disclosure of detailed information about borrowings [line items]
Interest rates	7.22%	5.69%	7.36%	5.96%	7.53%	6.09%

Debt - Summary of Notes Payable

Debt - Summary of Notes Payable to Contractors (Detail) - MXN ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Changes In Consolidated Debt [Abstract]
Total notes payable to contractors	$ 4,053,577	$ 6,988,699
Less: current portion of notes payable to contractors	2,173,285	4,181,102
Notes payable to contractors (long-term)	$ 1,880,292	$ 2,807,597

Debt - Summary of Notes Paya105

Debt - Summary of Notes Payable to Contractors (Parenthetical) (Detail) $ in Thousands, $ in Thousands	Dec. 31, 2017USD ($)	Dec. 31, 2017MXN ($)	Dec. 31, 2016USD ($)	Dec. 31, 2016MXN ($)
Disclosure Of Changes In Consolidated Debt [Line Items]
Notes payable outstanding		$ 1,678,843		$ 3,986,565
Floating Production Storage And Offloading [member]
Disclosure Of Changes In Consolidated Debt [Line Items]
Investment	$ 723,575
Outstanding balances owed to contractor	$ 120,017	$ 2,374,734	$ 145,283	$ 3,002,134

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, 2017USD ($)
Disclosure Of Estimated Future Contract Payments [Line Items]
2,018	$ 25,267
2,019	25,267
2,020	25,267
2,021	25,267
2,022	18,949
Total	$ 120,017

Debt - Summary of Outstanding L

Debt - Summary of Outstanding Liability Transaction Payable (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017MXN ($)	Dec. 31, 2016USD ($)
Outstanding Liability Transaction Payable [Abstract]
2,018	$ 3,957,317	$ 199,999
2,019	3,886,037	196,396
2,020	3,886,037	196,396
2,021	3,886,037	196,396
2,022	3,886,037	196,396
2023 and thereafter	39,450,325	1,993,781
Total	58,951,790	2,979,364
Less: short-term unaccrued interest	2,399,475	121,267
Less: long-term unaccrued interest	23,875,047	1,206,621
Total financing	32,677,268	1,651,476
Less: short-term portion of financing (excluding interest)	1,557,842	78,732
Total long term financing	$ 31,119,426	$ 1,572,744

Debt - Summary of Foreign Curre

Debt - Summary of Foreign Currency Translation (Detail) - MXN ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
U.S. dollars [member]
Disclosure Of Foreign Currency Translation [Line Items]
Exchange rate	$ 19.7867	$ 20.6640
Japanese yen [member]
Disclosure Of Foreign Currency Translation [Line Items]
Exchange rate	0.1757	0.1772
Pounds Sterling [member]
Disclosure Of Foreign Currency Translation [Line Items]
Exchange rate	26.7724	25.3051
Euro [member]
Disclosure Of Foreign Currency Translation [Line Items]
Exchange rate	23.7549	21.6724
Swiss Francs [member]
Disclosure Of Foreign Currency Translation [Line Items]
Exchange rate	20.2992	20.1974
Canadian dollar [member]
Disclosure Of Foreign Currency Translation [Line Items]
Exchange rate	15.7858	15.2896
Australian Dollar [member]
Disclosure Of Foreign Currency Translation [Line Items]
Exchange rate	$ 15.4752	$ 14.8842

Debt - Summary of Maturities of

Debt - Summary of Maturities of Long Term Debt Principal Outstanding and Accrued Interest (Detail) - MXN ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Disclosure of detailed information about borrowings [abstract]
2,018	$ 157,209,467
2,019	159,403,397
2,020	209,915,748
2,021	185,307,669
2,022	158,761,145
2023 and thereafter	1,167,277,645
Total	$ 2,037,875,071	$ 1,983,170,730

Debt - Summary of Changes in Co

Debt - Summary of Changes in Consolidated Debt (Detail) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Changes In Consolidated Debt [Line Items]
Accrued interest	$ 32,078,624	$ 27,815,467
Financed public works contracts [member]
Disclosure Of Changes In Consolidated Debt [Line Items]
Changes in total debt: At the beginning of the year	1,983,170,730	1,493,381,835
Loans obtained-financing institutions	704,715,468	829,579,084
Loans obtained-financing lease		21,924,053
Debt payments	(642,059,819)	(614,987,329)
Interest paid	(108,910,417)	(88,757,428)
Foreign exchange	(16,685,439)	243,182,764
Accrued interest	117,644,548	98,847,751
At the end of the year	$ 2,037,875,071	$ 1,983,170,730

Derivative Financial Instrum111

Derivative Financial Instruments - Additional Information (Detail) € in Thousands	Dec. 31, 2017USD ($)$ / $Agreement	Apr. 30, 2017USD ($)	Dec. 31, 2017USD ($)$ / $Exchange_RateAgreement	Dec. 31, 2017MXN ($)Exchange_Rate	Dec. 31, 2016MXN ($)Exchange_Rate	Dec. 31, 2015MXN ($)Exchange_Rate	Jan. 31, 2021USD ($)	Feb. 29, 2020USD ($)	Dec. 31, 2019USD ($)	Nov. 30, 2019MXN ($)	Jun. 30, 2019MXN ($)	Dec. 31, 2017MXN ($)$ / $Agreement	Dec. 31, 2017EUR (€)$ / $Agreement	Dec. 31, 2016USD ($)	Dec. 31, 2016MXN ($)	Dec. 31, 2016JPY (¥)	Dec. 31, 2014
Disclosure of detailed information about financial instruments [line items]
Notional amount of debt issued	$ 6,700,000,000		$ 6,700,000,000									$ 23,500,000,000
Currency exchange rate | $ / $	19.7867		19.7867									19.7867	19.7867
Net foreign exchange loss			$ (1,171,702,000)	$ (23,184,122,000)	$ 254,012,743,000	$ 154,765,574,000
Percentage of company's total financial assets may be denominated in a currency other than its functional currency			5.00%	5.00%
Confidence level percentage			95.00%	95.00%
Net income			$ (14,193,909,000)	$ (280,850,619,000)	$ (191,144,342,000)	$ (712,567,398,000)
Increase decrease in exchange rate			10.00%	10.00%	10.00%	10.00%
Increase in occurs of crude oil hedge			$ 0
Notes, face value												$ 2,001,742,870,000			$ 1,948,366,564,000
Preserve a cash balance at suitable level			$ 3,000,000,000
Net fair value of derivative financial instruments												12,367,475,000			(26,010,486,000)
Derivative financial instruments designated as hedges												$ 0			$ 0
Net gain (loss) of derivative financial instrument				$ 25,338,324,000	$ (14,000,987,000)	$ (21,449,877,000)
Increase [member]
Disclosure of detailed information about financial instruments [line items]
Net income				149,669,000	124,512,000	105,915,000
Decrease [member]
Disclosure of detailed information about financial instruments [line items]
Net income				$ 149,669,000	$ 124,512,000	$ 105,915,000
EURO [member]
Disclosure of detailed information about financial instruments [line items]
Currency exchange rate	23.7549		23.7549									23.7549	23.7549	21.6724	21.6724	21.6724
Us Dollar [member]
Disclosure of detailed information about financial instruments [line items]
Average foreign exchange rate | Exchange_Rate			19.7867	19.7867	20.6640
Euro [member]
Disclosure of detailed information about financial instruments [line items]
Average foreign exchange rate | Exchange_Rate			23.7549	23.7549	21.6724
Japan, Yen [member]
Disclosure of detailed information about financial instruments [line items]
Currency exchange rate	0.1757		0.1757									0.1757	0.1757	0.17721	0.17721	0.17721
Top of range [member]
Disclosure of detailed information about financial instruments [line items]
Liquidity risk mitigation amount through syndicated credit lines				$ 700,000,000
Liquidity risk mitigation amount through bilateral credit lines				$ 650,000,000
P.M.I. Norteamrica, S. A. de C. V. [member]
Disclosure of detailed information about financial instruments [line items]
Note maturity period			Dec. 31, 2017	Dec. 31, 2017
Maturity period			June 2,016	June 2,016
Notes, face value	$ 108,000		$ 108,000
Investment in structured notes			$ 0
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 income				$ 704,011,000	$ 841,024,000	$ 922,268,000
P.M.I. Holdings, B.V. [member] | Twenty five basis points lower [member]
Disclosure of detailed information about financial instruments [line items]
Net income				$ 704,011,000	$ 841,024,000	$ 922,268,000
PMI Trading Ltd [member]
Disclosure of detailed information about financial instruments [line items]
Confidence level percentage			99.00%	99.00%
VaR recorded	(8,789)		$ (8,789)											$ (23,198)
PMI Trading Ltd [member] | Top of range [member]
Disclosure of detailed information about financial instruments [line items]
VaR recorded	(19,695)		(19,695)
PMI Trading Ltd [member] | Bottom of range [member]
Disclosure of detailed information about financial instruments [line items]
VaR recorded	(4,720)		$ (4,720)
Pemex industrial transformation [member]
Disclosure of detailed information about financial instruments [line items]
Average foreign exchange rate | Exchange_Rate					20.6640	17.2065
Percent of overdue accounts over total sales			1.00%	1.00%
Pemex industrial transformation [member] | Exempted credit line [member]
Disclosure of detailed information about financial instruments [line items]
Fair value for client with credit lines			$ 1,464
Amount of credit lines	117,956		$ 117,956
Percentage of available credit lines			1.00%	1.00%
Pemex industrial transformation [member] | Guaranteed credit line [member]
Disclosure of detailed information about financial instruments [line items]
Fair value for client with credit lines			$ 8,183
Amount of credit lines	930,199		$ 930,199
Percentage of available credit lines			1.00%	1.00%
Cross - currency swaps [member] | P.M.I. Norteamrica, S. A. de C. V. [member]
Disclosure of detailed information about financial instruments [line items]
Notional amount of debt issued	$ 450,000,000		$ 450,000,000
Seagull option [member] | P.M.I. Norteamrica, S. A. de C. V. [member]
Disclosure of detailed information about financial instruments [line items]
Notional amount of debt issued													€ 4,250,000			¥ 80,000,000
Annual coupon rate														0.50%	0.50%	0.50%
Currency exchange rate	19.7867		19.7867			17.2065						19.7867	19.7867	20.6640	20.6640	20.6640	14.7180
Average foreign exchange rate | Exchange_Rate			117.39	117.39
Net foreign exchange loss				$ 23,184,122,000	$ (254,012,743,000)	$ (154,765,574,000)
Proportion of net foreign exchange loss			89.40%	89.40%
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 loss				$ 16,685,439,000	$ (243,182,764,000)	$ (152,554,454,000)
Seagull option [member] | P.M.I. Norteamrica, S. A. de C. V. [member] | Japan, Yen [member]
Disclosure of detailed information about financial instruments [line items]
Currency exchange rate	75		75									75	75	83.7000	83.7000	83.7000
Peso teasury portfolio [member] | P.M.I. Holdings, B.V. [member]
Disclosure of detailed information about financial instruments [line items]
Investment in Portfolio				(10,820)
Fondo laboral pemex portfolio [member] | P.M.I. Holdings, B.V. [member]
Disclosure of detailed information about financial instruments [line items]
Investment in Portfolio				(44,950)
Fideicomiso de Cobertura Laboral y de Vivienda Portfolio [member] | P.M.I. Holdings, B.V. [member]
Disclosure of detailed information about financial instruments [line items]
Investment in Portfolio				(7,170)
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	$ (544,320)
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	$ 71,936		$ 71,936
Interest rate of derivative instrument	4.17%		4.17%									4.17%	4.17%
Weighted average term of derivative instrument	4 years 4 months 28 days
Exchange rate risk [member] | Extinguishing swap [member] | P.M.I. Norteamrica, S. A. de C. V. [member]
Disclosure of detailed information about financial instruments [line items]
Aggregate notional amount	$ 1,146,410,000		$ 1,146,410,000
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							$ 1,950,000,000	$ 3,250,000,000	$ 1,500,000,000	$ 20,000,000,000	$ 3,500,000,000
Equity price risk [member]
Disclosure of detailed information about financial instruments [line items]
Number of barrels hedged		409,000	440,000	440,000
Amount of barrels hedged	449,898,000	133,503,000	449,898,000									449,898,000	449,898,000
Income from hedged		$ 205,705,000
PEMEX [member] | Interest rate risk [member]
Disclosure of detailed information about financial instruments [line items]
Total net debt outstanding consisted of floating rate debt	15.60%
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	4
Aggregate notional amount	$ 1,623,750		$ 1,623,750
Interest rate of derivative instrument	2.35%		2.35%									2.35%	2.35%
Weighted average term of derivative instrument	7 years 11 days
PEMEX [member] | Exchange rate risk [member] | Cross - currency swaps [member] | P.M.I. Norteamrica, S. A. de C. V. [member] | Philippines, Pesos [member]
Disclosure of detailed information about financial instruments [line items]
Aggregate notional amount												$ 6,291,969,000
PEMEX [member] | Exchange rate risk [member] | Inflation risk [member] | P.M.I. Norteamrica, S. A. de C. V. [member] | EURO [member]
Disclosure of detailed information about financial instruments [line items]
Aggregate notional amount														$ 3,459,236,000
PEMEX [member] | Exchange rate risk [member] | Inflation risk [member] | P.M.I. Norteamrica, S. A. de C. V. [member] | Philippines, Pesos [member]
Disclosure of detailed information about financial instruments [line items]
Aggregate notional amount															$ 1,077,101,000

Derivative Financial Instrum112

Derivative Financial Instruments - Details of Interest rate sensitivity (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)
Switzerland, Francs [member]
Derivative Financial Instruments [line items]
Sensitivity debt	$ 3,144
Sensitivity DFIs	(3,144)
PEMEX Curves Sensitivity debt	3,030
EURO [member]
Derivative Financial Instruments [line items]
Sensitivity debt	100,081
Sensitivity DFIs	(84,962)
Sensitivity net	15,119
PEMEX Curves Sensitivity debt	82,839
Pound sterling [member]
Derivative Financial Instruments [line items]
Sensitivity debt	7,691
Sensitivity DFIs	(7,073)
Sensitivity net	618
PEMEX Curves Sensitivity debt	6,587
Japan, Yen [member]
Derivative Financial Instruments [line items]
Sensitivity debt	8,542
Sensitivity DFIs	(3,972)
Sensitivity net	4,570
PEMEX Curves Sensitivity debt	6,877
Mexico, Pesos [member]
Derivative Financial Instruments [line items]
Sensitivity debt	43,774
Sensitivity DFIs	2,039
Sensitivity net	45,813
PEMEX Curves Sensitivity debt	42,012
Mexican Unidad de Inversion [member]
Derivative Financial Instruments [line items]
Sensitivity debt	16,496
Sensitivity DFIs	(11,586)
Sensitivity net	4,910
PEMEX Curves Sensitivity debt	15,453
U.S [member]
Derivative Financial Instruments [line items]
Sensitivity debt	785,508
Sensitivity DFIs	89,880
Sensitivity net	875,388
PEMEX Curves Sensitivity debt	$ 416,052

Derivative Financial Instrum113

Derivative Financial Instruments - Details of Interest rate and currency Derivative Financial Instruments (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)
Switzerland, Francs [member]
Disclosure of financial instruments by type of interest rate [line items]
Debt	$ 3,144
DFIs	(3,144)
1% Debt	(13,624)
EURO [member]
Disclosure of financial instruments by type of interest rate [line items]
Debt	100,081
DFIs	(84,962)
Net	15,119
1% Debt	(167,068)
Pound sterling [member]
Disclosure of financial instruments by type of interest rate [line items]
Debt	7,691
DFIs	(7,073)
Net	618
1% Debt	(12,322)
Japan, Yen [member]
Disclosure of financial instruments by type of interest rate [line items]
Debt	8,542
DFIs	(3,972)
Net	4,570
1% Debt	(14,859)
Mexico, Pesos [member]
Disclosure of financial instruments by type of interest rate [line items]
Debt	43,774
DFIs	2,039
Net	45,813
1% Debt	(133,525)
Mexican Unidad de Inversion [member]
Disclosure of financial instruments by type of interest rate [line items]
1% Debt	(28,573)
Interbank Yield Curves One Percentage [member] | Switzerland, Francs [member]
Disclosure of financial instruments by type of interest rate [line items]
Debt	(13,943)
DFIs	13,943
Interbank Yield Curves One Percentage [member] | EURO [member]
Disclosure of financial instruments by type of interest rate [line items]
Debt	(187,988)
DFIs	165,894
Net	(22,094)
Interbank Yield Curves One Percentage [member] | Pound sterling [member]
Disclosure of financial instruments by type of interest rate [line items]
Debt	(13,822)
DFIs	13,042
Net	(780)
Interbank Yield Curves One Percentage [member] | Japan, Yen [member]
Disclosure of financial instruments by type of interest rate [line items]
Debt	(16,914)
DFIs	11,470
Net	(5,444)
Interbank Yield Curves One Percentage [member] | Mexico, Pesos [member]
Disclosure of financial instruments by type of interest rate [line items]
Debt	(135,974)
DFIs	1,409
Net	(134,565)
Interbank Yield Curves One Percentage [member] | Mexican Unidad de Inversion [member]
Disclosure of financial instruments by type of interest rate [line items]
Debt	(29,485)
DFIs	25,358
Net	(4,127)
Interbank Yield Curves VaR Ninety Percentage [member] | EURO [member]
Disclosure of financial instruments by type of interest rate [line items]
Net	(19,744)
Interbank Yield Curves VaR Ninety Percentage [member] | Pound sterling [member]
Disclosure of financial instruments by type of interest rate [line items]
Net	(666)
Interbank Yield Curves VaR Ninety Percentage [member] | Japan, Yen [member]
Disclosure of financial instruments by type of interest rate [line items]
Net	(4,398)
Interbank Yield Curves VaR Ninety Percentage [member] | Mexico, Pesos [member]
Disclosure of financial instruments by type of interest rate [line items]
Net	(162,336)
Interbank Yield Curves VaR Ninety Percentage [member] | Mexican Unidad de Inversion [member]
Disclosure of financial instruments by type of interest rate [line items]
Net	$ (5,038)

Derivative Financial Instrum114

Derivative Financial Instruments - Details of current and potential exposures and aggregated by credit rating (Detail) $ in Thousands	Dec. 31, 2017USD ($)
Current [member] | A [member]
Derivative Financial Instruments [line items]
Maximum Credit Exposure by term in Petroleos Mexicanos	$ 257,424
Current [member] | A - [member]
Derivative Financial Instruments [line items]
Maximum Credit Exposure by term in Petroleos Mexicanos	138,850
Current [member] | BBB + [member]
Derivative Financial Instruments [line items]
Maximum Credit Exposure by term in Petroleos Mexicanos	310,705
Current [member] | BBB [member]
Derivative Financial Instruments [line items]
Maximum Credit Exposure by term in Petroleos Mexicanos	2,183
Less than 1 year [member] | A [member]
Derivative Financial Instruments [line items]
Maximum Credit Exposure by term in Petroleos Mexicanos	976,230
Less than 1 year [member] | A - [member]
Derivative Financial Instruments [line items]
Maximum Credit Exposure by term in Petroleos Mexicanos	235,594
Less than 1 year [member] | BBB + [member]
Derivative Financial Instruments [line items]
Maximum Credit Exposure by term in Petroleos Mexicanos	1,010,356
Less than 1 year [member] | BBB [member]
Derivative Financial Instruments [line items]
Maximum Credit Exposure by term in Petroleos Mexicanos	18,626
One to Three Year [member] | A [member]
Derivative Financial Instruments [line items]
Maximum Credit Exposure by term in Petroleos Mexicanos	1,298,110
One to Three Year [member] | A - [member]
Derivative Financial Instruments [line items]
Maximum Credit Exposure by term in Petroleos Mexicanos	191,681
One to Three Year [member] | BBB + [member]
Derivative Financial Instruments [line items]
Maximum Credit Exposure by term in Petroleos Mexicanos	1,540,015
One to Three Year [member] | BBB [member]
Derivative Financial Instruments [line items]
Maximum Credit Exposure by term in Petroleos Mexicanos	20,064
3-5 years [member] | A [member]
Derivative Financial Instruments [line items]
Maximum Credit Exposure by term in Petroleos Mexicanos	1,314,296
3-5 years [member] | A - [member]
Derivative Financial Instruments [line items]
Maximum Credit Exposure by term in Petroleos Mexicanos	228,801
3-5 years [member] | BBB + [member]
Derivative Financial Instruments [line items]
Maximum Credit Exposure by term in Petroleos Mexicanos	1,349,311
3-5 years [member] | BBB [member]
Derivative Financial Instruments [line items]
Maximum Credit Exposure by term in Petroleos Mexicanos	18,092
5-7 years [member] | A [member]
Derivative Financial Instruments [line items]
Maximum Credit Exposure by term in Petroleos Mexicanos	578,548
5-7 years [member] | A - [member]
Derivative Financial Instruments [line items]
Maximum Credit Exposure by term in Petroleos Mexicanos	223,751
5-7 years [member] | BBB + [member]
Derivative Financial Instruments [line items]
Maximum Credit Exposure by term in Petroleos Mexicanos	1,243,898
7-10 years [member] | A [member]
Derivative Financial Instruments [line items]
Maximum Credit Exposure by term in Petroleos Mexicanos	482,959
7-10 years [member] | A - [member]
Derivative Financial Instruments [line items]
Maximum Credit Exposure by term in Petroleos Mexicanos	257,465
7-10 years [member] | BBB + [member]
Derivative Financial Instruments [line items]
Maximum Credit Exposure by term in Petroleos Mexicanos	1,115,559
More than 10 years [member] | BBB + [member]
Derivative Financial Instruments [line items]
Maximum Credit Exposure by term in Petroleos Mexicanos	$ 78,831

Derivative Financial Instrum115

Derivative Financial Instruments - Details of notional amounts of investments in domestic currency and organized by the credit ratings of the issuances (Detail) - Dec. 31, 2017 $ in Thousands, $ in Thousands	USD ($)	MXN ($)
Disclosure of credit risk exposure [line items]
Notional amount	$ 6,700,000	$ 23,500,000
mxAAA [member]
Disclosure of credit risk exposure [line items]
Notional amount		811,548
mxAA [member]
Disclosure of credit risk exposure [line items]
Notional amount		200,876
mxA [member]
Disclosure of credit risk exposure [line items]
Notional amount		$ 271,275

Derivative Financial Instrum116

Derivative Financial Instruments - Schedule of current and potential exposure, aggregated by credit rating and derivative financial instruments (Detail) $ in Thousands	Dec. 31, 2017USD ($)
Current [member] | A [member]
Disclosure of credit risk exposure [line items]
Maximum Credit Exposure by term in Pemex Industrial Transformation	$ 27
Current [member] | A - [member]
Disclosure of credit risk exposure [line items]
Maximum Credit Exposure by term in Pemex Industrial Transformation	541
Current [member] | BBB + [member]
Disclosure of credit risk exposure [line items]
Maximum Credit Exposure by term in Pemex Industrial Transformation	25
Less than 1 year [member] | A [member]
Disclosure of credit risk exposure [line items]
Maximum Credit Exposure by term in Pemex Industrial Transformation	27
Less than 1 year [member] | A - [member]
Disclosure of credit risk exposure [line items]
Maximum Credit Exposure by term in Pemex Industrial Transformation	541
Less than 1 year [member] | BBB + [member]
Disclosure of credit risk exposure [line items]
Maximum Credit Exposure by term in Pemex Industrial Transformation	25
One to Three Year [member] | A - [member]
Disclosure of credit risk exposure [line items]
Maximum Credit Exposure by term in Pemex Industrial Transformation	306
One to Three Year [member] | BBB + [member]
Disclosure of credit risk exposure [line items]
Maximum Credit Exposure by term in Pemex Industrial Transformation	$ 1

Derivative Financial Instrum117

Derivative Financial Instruments - Details of quantitative disclosure of debt cash flow's maturities (Detail) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
2018 [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	$ 125,130,842	$ 148,350,783
2018 [member] | Fixed rate (U.S. dollars) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	53,465,817	15,759,027
2018 [member] | Fixed rate (Japanese yen) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt		517,286
2018 [member] | Fixed rate (euros) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	1,043	26,006,880
2018 [member] | Fixed rate (Swiss Francs)) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	4,565,075
2018 [member] | Fixed rate (Australian dollars) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt		2,232,195
2018 [member] | Fixed rate [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	58,031,935	44,515,388
2018 [member] | Variable rate (U.S. dollars) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	58,364,536	38,811,320
2018 [member] | Variable rate (pesos) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	8,734,371	65,024,075
2018 [member] | Variable rate [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	67,098,907	103,835,395
2019 [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	159,403,398	127,349,970
2019 [member] | Fixed rate (U.S. dollars) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	59,498,256	86,161,096
2019 [member] | Fixed rate (UDIs) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	18,477,076
2019 [member] | Fixed rate (euros) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	32,042,196
2019 [member] | Fixed rate (Swiss Francs)) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	6,088,686	4,539,022
2019 [member] | Fixed rate [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	116,106,214	90,700,118
2019 [member] | Variable rate (U.S. dollars) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	15,302,101	27,907,661
2019 [member] | Variable rate (pesos) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	27,995,083	8,742,191
2019 [member] | Variable rate [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	43,297,184	36,649,852
2020 [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	209,915,748	162,209,245
2020 [member] | Fixed rate (U.S. dollars) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	60,290,621	65,642,616
2020 [member] | Fixed rate (pesos) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	10,033,017
2020 [member] | Fixed rate (UDIs) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	4,764,175	17,319,897
2020 [member] | Fixed rate (euros) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	30,801,894	29,198,138
2020 [member] | Fixed rate (Swiss Francs)) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	12,149,953	6,056,338
2020 [member] | Fixed rate [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	118,039,660	118,216,989
2020 [member] | Variable rate (U.S. dollars) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	62,289,546	15,984,547
2020 [member] | Variable rate (Japanese yen) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	11,244,800
2020 [member] | Variable rate (pesos) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	18,341,742	28,007,709
2020 [member] | Variable rate [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	91,876,088	43,992,256
2021 [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	185,307,669	199,534,891
2021 [member] | Fixed rate (U.S. dollars) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	95,232,448	62,440,943
2021 [member] | Fixed rate (pesos) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	20,376,655	10,048,950
2021 [member] | Fixed rate (UDIs) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	3,874,313	4,464,787
2021 [member] | Fixed rate (euros) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	41,508,857	28,061,554
2021 [member] | Fixed rate (Swiss Francs)) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	3,046,567	12,102,748
2021 [member] | Fixed rate [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	164,038,840	117,118,982
2021 [member] | Variable rate (U.S. dollars) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	12,809,666	52,726,647
2021 [member] | Variable rate (Japanese yen) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt		11,341,440
2021 [member] | Variable rate (pesos) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	8,459,163	18,347,822
2021 [member] | Variable rate [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	21,268,829	82,415,909
2022 thereafter [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	158,761,145	147,813,212
2022 thereafter [member] | Fixed rate (U.S. dollars) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	84,076,050	98,858,992
2022 thereafter [member] | Fixed rate (Pounds) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	9,345,839
2022 thereafter [member] | Fixed rate (pesos) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	1,999,098	20,457,671
2022 thereafter [member] | Fixed rate (UDIs) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt		3,630,557
2022 thereafter [member] | Fixed rate (euros) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	23,655,950
2022 thereafter [member] | Fixed rate (Swiss Francs)) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt		3,031,480
2022 thereafter [member] | Fixed rate [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	119,076,937	125,978,700
2022 thereafter [member] | Variable rate (U.S. dollars) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	31,289,725	13,366,336
2022 thereafter [member] | Variable rate (pesos) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	8,394,483	8,468,176
2022 thereafter [member] | Variable rate [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	39,684,208	21,834,512
Maturity Period Eight [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	1,167,277,644	1,170,097,223
Maturity Period Eight [member] | Fixed rate (U.S. dollars) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	808,836,547	826,093,574
Maturity Period Eight [member] | Fixed rate (Japanese yen) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	19,296,607	19,459,306
Maturity Period Eight [member] | Fixed rate (Pounds) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	11,952,816	8,825,434
Maturity Period Eight [member] | Fixed rate (pesos) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	88,349,072	90,393,507
Maturity Period Eight [member] | Fixed rate (UDIs) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	30,081,647	28,288,180
Maturity Period Eight [member] | Fixed rate (euros) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	171,255,634	123,886,644
Maturity Period Eight [member] | Fixed rate [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	1,129,772,323	1,096,946,645
Maturity Period Eight [member] | Variable rate (U.S. dollars) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	18,379,557	45,385,885
Maturity Period Eight [member] | Variable rate (pesos) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	19,125,764	27,764,693
Maturity Period Eight [member] | Variable rate [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	37,505,321	73,150,578
Net Carrying Amount [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	2,005,796,446	1,955,355,324
Net Carrying Amount [member] | Fixed rate (U.S. dollars) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	$ 1,161,399,739	$ 1,154,956,248
Average interest rate (%)	5.7747%	5.6541%
Net Carrying Amount [member] | Fixed rate (Japanese yen) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	$ 19,296,607	$ 19,976,592
Average interest rate (%)	1.3485%	1.3665%
Net Carrying Amount [member] | Fixed rate (Pounds) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	$ 21,298,655	$ 8,825,434
Average interest rate (%)	5.7246%	8.25%
Net Carrying Amount [member] | Fixed rate (pesos) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	$ 120,757,842	$ 120,900,128
Average interest rate (%)	7.4876%	7.4878%
Net Carrying Amount [member] | Fixed rate (UDIs) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	$ 57,197,211	$ 53,703,421
Average interest rate (%)	2.7458%	4.0559%
Net Carrying Amount [member] | Fixed rate (euros) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	$ 299,265,574	$ 207,153,216
Average interest rate (%)	3.6736%	3.9581%
Net Carrying Amount [member] | Fixed rate (Swiss Francs)) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	$ 25,850,281	$ 25,729,588
Average interest rate (%)	1.8387%	1.8385%
Net Carrying Amount [member] | Fixed rate (Australian dollars) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt		$ 2,232,195
Average interest rate (%)		6.125%
Net Carrying Amount [member] | Fixed rate [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	$ 1,705,065,909	$ 1,593,476,822
Net Carrying Amount [member] | Variable rate (U.S. dollars) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	198,435,131	194,182,396
Net Carrying Amount [member] | Variable rate (Japanese yen) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	11,244,800	11,341,440
Net Carrying Amount [member] | Variable rate (pesos) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	91,050,606	156,354,666
Net Carrying Amount [member] | Variable rate [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	300,730,537	361,878,502
Fair value [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	2,153,383,220	1,988,275,614
Fair value [member] | Fixed rate (U.S. dollars) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	1,213,404,769	1,137,936,275
Fair value [member] | Fixed rate (Japanese yen) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	18,040,398	17,336,203
Fair value [member] | Fixed rate (Pounds) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	24,381,394	11,373,345
Fair value [member] | Fixed rate (pesos) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	171,683,692	160,930,040
Fair value [member] | Fixed rate (UDIs) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	56,536,905	50,809,979
Fair value [member] | Fixed rate (euros) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	330,573,998	216,100,006
Fair value [member] | Fixed rate (Swiss Francs)) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	26,957,785	26,469,543
Fair value [member] | Fixed rate (Australian dollars) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt		2,346,390
Fair value [member] | Fixed rate [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	1,841,578,940	1,623,301,781
Fair value [member] | Variable rate (U.S. dollars) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	206,254,219	195,838,382
Fair value [member] | Variable rate (Japanese yen) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	11,361,079	11,025,531
Fair value [member] | Variable rate (pesos) [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	94,188,981	158,109,920
Fair value [member] | Variable rate [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Outstanding debt	$ 311,804,280	$ 364,973,833

Derivative Financial Instrum118

Derivative Financial Instruments - Details of quantitative disclosure of debt cash flow's maturities (Parenthetical) (Detail)	Dec. 31, 2017$ / $	Dec. 31, 2016
Disclosure of maturity analysis for derivative financial liabilities [line items]
Exchange rates	19.7867
U.S [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Exchange rates	19.7867	20.664
Japan, Yen [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Exchange rates	0.1757	0.17721
Pound sterling [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Exchange rates	26.7724	25.30513
Mexican Unidad de Inversion [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Exchange rates	5.934551	5.562883
EURO [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Exchange rates	23.7549	21.6724
Switzerland, Francs [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Exchange rates	20.2992	20.19744
Australia, Dollars [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Exchange rates	15.4752	14.88428

Derivative Financial Instrum119

Derivative Financial Instruments - Summary of Quantitative Disclosure of Cash Flow's Maturities (Detail)	12 Months Ended
	Dec. 31, 2017MXN ($)	Dec. 31, 2016MXN ($)
Disclosure of maturity analysis for derivative financial liabilities [line items]
Currency Options	$ 59,360,100
Currency Options Position One [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Currency Options	14,046,320
Currency options position two [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Currency Options	100,950,853
Currency options position three [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Currency Options	12,031,728
Currency Options [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Currency Options		$ 14,133,580
2017 [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Currency Options	59,360,100
2020 [member] | Currency options position two [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Currency Options	41,567,998
2022 Thereafter [member] | Currency Options Position One [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Currency Options	14,046,320
2022 Thereafter [member] | Currency options position two [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Currency Options	59,382,855
2022 Thereafter [member] | Currency options position three [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Currency Options	12,031,728
Fair value [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Currency Options	(2,006,461)
Fair value [member] | Currency Options Position One [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Currency Options	48,715
Fair value [member] | Currency options position two [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Currency Options	4,919,444
Fair value [member] | Currency options position three [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Currency Options	$ (239,626)
Fair value [member] | Currency Options [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Currency Options		(301,131)
Maturity Period Eight [member] | Currency Options [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Currency Options		$ 14,133,580
U.S [member] | Interest Rate Swap 1 [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Variable to fixed	33,552,022	39,939,292
U.S [member] | 2017 [member] | Interest Rate Swap 1 [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Variable to fixed	4,704,170
Average pay rate	3.16%
Average receive rate	3.19%
U.S [member] | 2018 [member] | Interest Rate Swap 1 [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Variable to fixed	4,717,321	4,899,645
Average pay rate	3.18%	2.76%
Average receive rate	3.44%	2.95%
U.S [member] | 2019 [member] | Interest Rate Swap 1 [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Variable to fixed	4,730,857	4,912,743
Average pay rate	3.20%	2.66%
Average receive rate	3.69%	2.99%
U.S [member] | 2020 [member] | Interest Rate Swap 1 [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Variable to fixed	4,686,396	4,926,477
Average pay rate	3.22%	3.35%
Average receive rate	3.81%	3.03%
U.S [member] | 2021 [member] | Interest Rate Swap 1 [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Variable to fixed	4,570,070	4,940,613
Average pay rate	3.26%	3.83%
Average receive rate	3.95%	3.06%
U.S [member] | 2022 Thereafter [member] | Interest Rate Swap 1 [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Variable to fixed	10,143,209
Average pay rate	3.48%
Average receive rate	4.48%
U.S [member] | Fair value [member] | Interest Rate Swap 1 [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Variable to fixed	388,851	164,716
U.S [member] | 2022 thereafter [member] | Interest Rate Swap 1 [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Variable to fixed		4,894,180
Average pay rate		4.04%
Average receive rate		3.11%
U.S [member] | Maturity Period Eight [member] | Interest Rate Swap 1 [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Variable to fixed		15,365,634
Average pay rate		4.57%
Average receive rate		3.33%
Receive euros pay us dollars [member] | Cross - currency swaps [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Received cross currency swaps	$ 278,440,124	$ 229,016,488
Receive euros pay us dollars [member] | 2018 [member] | Cross - currency swaps [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Received cross currency swaps	29,898,198	34,775,198
Receive euros pay us dollars [member] | 2019 [member] | Cross - currency swaps [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Received cross currency swaps	28,719,208
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	36,902,690	31,223,821
Receive euros pay us dollars [member] | 2021 [member] | Cross - currency swaps [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Received cross currency swaps	21,302,856	29,992,556
Receive euros pay us dollars [member] | 2022 Thereafter [member] | Cross - currency swaps [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Received cross currency swaps	161,617,172
Receive euros pay us dollars [member] | Fair value [member] | Cross - currency swaps [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Received cross currency swaps	19,065,727	(16,484,533)
Receive euros pay us dollars [member] | Maturity Period Eight [member] | Cross - currency swaps [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Received cross currency swaps		133,024,913
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	17,815,114	23,217,534
Receive Japanese yen pay us dollars [member] | 2018 [member] | Cross - currency swaps [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Received cross currency swaps		532,711
Receive Japanese yen pay us dollars [member] | 2019 [member] | Cross - currency swaps [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Received cross currency swaps	13,039,563
Receive Japanese yen pay us dollars [member] | 2021 [member] | Cross - currency swaps [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Received cross currency swaps		17,697,534
Receive Japanese yen pay us dollars [member] | 2022 Thereafter [member] | Cross - currency swaps [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Received cross currency swaps	4,775,551
Receive Japanese yen pay us dollars [member] | Fair value [member] | Cross - currency swaps [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Received cross currency swaps	(1,670,533)	(6,132,633)
Receive Japanese yen pay us dollars [member] | Maturity Period Eight [member] | Cross - currency swaps [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Received cross currency swaps		4,987,289
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	22,017,215	10,767,349
Receive pounds sterling pay us dollars [member] | 2021 [member] | Cross - currency swaps [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Received cross currency swaps	10,310,216
Receive pounds sterling pay us dollars [member] | 2022 Thereafter [member] | Cross - currency swaps [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Received cross currency swaps	11,706,999
Receive pounds sterling pay us dollars [member] | Fair value [member] | Cross - currency swaps [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Received cross currency swaps	1,151,096	(211,207)
Receive pounds sterling pay us dollars [member] | Maturity Period Eight [member] | Cross - currency swaps [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Received cross currency swaps		10,767,349
Receive udi pay pesos [member] | Cross - currency swaps [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Received cross currency swaps	54,638,028	44,593,759
Receive udi pay pesos [member] | 2018 [member] | Cross - currency swaps [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Received cross currency swaps	23,740,341
Receive udi pay pesos [member] | 2019 [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] | 2020 [member] | Cross - currency swaps [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Received cross currency swaps	3,000,000	23,740,341
Receive udi pay pesos [member] | 2021 [member] | Cross - currency swaps [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Received cross currency swaps		3,540,220
Receive udi pay pesos [member] | 2022 Thereafter [member] | Cross - currency swaps [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Received cross currency swaps	20,605,166
Receive udi pay pesos [member] | Fair value [member] | Cross - currency swaps [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Received cross currency swaps	(4,720,592)	(2,132,236)
Receive udi pay pesos [member] | 2022 thereafter [member] | Cross - currency swaps [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Received cross currency swaps		3,000,000
Receive udi pay pesos [member] | Maturity Period Eight [member] | Cross - currency swaps [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Received cross currency swaps		14,313,198
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	25,579,588	26,713,732
Receive swiss francs pay us dollars [member] | 2017 [member] | Cross - currency swaps [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Received cross currency swaps	4,535,474
Receive swiss francs pay us dollars [member] | 2018 [member] | Cross - currency swaps [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Received cross currency swaps	6,501,082
Receive swiss francs pay us dollars [member] | 2019 [member] | Cross - currency swaps [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Received cross currency swaps	11,548,658	4,736,567
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	2,994,374	6,789,326
Receive swiss francs pay us dollars [member] | 2021 [member] | Cross - currency swaps [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Received cross currency swaps		12,060,700
Receive swiss francs pay us dollars [member] | Fair value [member] | Cross - currency swaps [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Received cross currency swaps	$ 400,316	(789,449)
Receive swiss francs pay us dollars [member] | 2022 thereafter [member] | Cross - currency swaps [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Received cross currency swaps		3,127,139
Receive australian dollars pay dollars [member] | Cross - currency swaps [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Received cross currency swaps		2,459,429
Receive australian dollars pay dollars [member] | 2018 [member] | Cross - currency swaps [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Received cross currency swaps		2,459,429
Receive australian dollars pay dollars [member] | Fair value [member] | Cross - currency swaps [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Received cross currency swaps		$ (126,796)

Derivative Financial Instrum120

Derivative Financial Instruments - Summary of Quantitative Disclosure of Cash Flow's Maturities (Parenthetical) (Detail)	Dec. 31, 2017$ / $	Dec. 31, 2016
Disclosure of maturity analysis for derivative financial liabilities [line items]
Exchange rates	19.7867
U.S [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Exchange rates	19.7867	20.664
EURO [member]
Disclosure of maturity analysis for derivative financial liabilities [line items]
Exchange rates	23.7549	21.6724

Derivative Financial Instrum121

Derivative Financial Instruments - Summary of Fair Values and Notional Amounts of DFIs that were designated as non-hedges (Detail) $ in Thousands	Dec. 31, 2017USD ($)MMB	Dec. 31, 2017MXN ($)MMB	Dec. 31, 2016MXN ($)MMB
Disclosure of detailed information about hedging instruments [line items]
Notional amount	$ 6,700,000	$ 23,500,000,000
Fair Value		17,337,760,000	$ (26,010,486,000)
Interest Rate Swaps Position One [member]
Disclosure of detailed information about hedging instruments [line items]
Notional amount		16,695,028,000	20,018,250,000
Fair Value		79,448,000	(90,451,000)
Interest Rate Swaps Position Two [member]
Disclosure of detailed information about hedging instruments [line items]
Notional amount		15,433,626,000	18,132,660,000
Fair Value		332,273,000	312,210,000
Cross Currency Swaps Position One [member]
Disclosure of detailed information about hedging instruments [line items]
Notional amount		23,740,341,000	23,740,341,000
Fair Value		(4,504,151,000)	(4,815,373,000)
Cross Currency Swaps Position Two [member]
Disclosure of detailed information about hedging instruments [line items]
Notional amount		30,897,687,000	20,853,418,000
Fair Value		(216,441,000)	2,683,138,000
Cross Currency Swaps Position Three [member]
Disclosure of detailed information about hedging instruments [line items]
Notional amount		4,775,551,000	5,520,000,000
Fair Value		134,461,000	(116,507,000)
Cross Currency Swaps Position Four [member]
Disclosure of detailed information about hedging instruments [line items]
Notional amount		13,039,563,000	17,697,534,000
Fair Value		(1,804,993,000)	(6,016,126,000)
Cross Currency Swaps Position Five [member]
Disclosure of detailed information about hedging instruments [line items]
Notional amount		278,440,124,000	229,016,488,000
Fair Value		19,065,727,000	(16,484,533,000)
Cross currency swaps position nine [member]
Disclosure of detailed information about hedging instruments [line items]
Notional amount		11,706,999,000
Fair Value		590,113,000
Cross Currency Swaps Position Six [member]
Disclosure of detailed information about hedging instruments [line items]
Notional amount		10,310,216,000	10,767,349,000
Fair Value		560,982,000	(211,207,000)
Cross Currency Swaps Position Seven [member]
Disclosure of detailed information about hedging instruments [line items]
Notional amount		25,579,588,000	26,713,732,000
Fair Value		400,316,000	(789,449,000)
Cross Currency Swaps Position Eight [member]
Disclosure of detailed information about hedging instruments [line items]
Notional amount			2,459,429,000
Fair Value			(126,796,000)
Currency Options Position One [member]
Disclosure of detailed information about hedging instruments [line items]
Notional amount		14,046,320,000	14,133,580,000
Fair Value		48,715,000	(301,131,000)
Currency options position three [member]
Disclosure of detailed information about hedging instruments [line items]
Notional amount		100,950,853,000
Fair Value		4,919,444,000
Currency options position two [member]
Disclosure of detailed information about hedging instruments [line items]
Notional amount		12,031,728,000
Fair Value		(239,626,000)
Currency forward Position one [member]
Disclosure of detailed information about hedging instruments [line items]
Notional amount		59,360,100,000
Fair Value		(2,006,461,000)
Natural Gas Swaps Position One [member]
Disclosure of detailed information about hedging instruments [line items]
Notional amount		(51,724,000)	(160,214,000)
Fair Value		6,934,000	(25,145,000)
Natural Gas Swaps Position Two [member]
Disclosure of detailed information about hedging instruments [line items]
Notional amount		50,846,000	157,545,000
Fair Value		(6,114,000)	27,869,000
Natural Gas Options Position One [member]
Disclosure of detailed information about hedging instruments [line items]
Notional amount		18,625,000	73,653,000
Fair Value		398,000	11,548,000
Natural Gas Options Position Two [member]
Disclosure of detailed information about hedging instruments [line items]
Notional amount		(18,625,000)	(73,653,000)
Fair Value		(397,000)	(11,488,000)
Interest Rate Swaps Position Three [member]
Disclosure of detailed information about hedging instruments [line items]
Notional amount		1,423,368,000	1,788,382,000
Fair Value		$ (22,870,000)	$ (57,043,000)
Crude oil options [member]
Disclosure of detailed information about hedging instruments [line items]
Volume | MMB	153.56	153.56
Fair Value		$ (5,010,187)
Futures [member] | Exchange trade [member]
Disclosure of detailed information about hedging instruments [line items]
Volume | MMB	2.1	2.1
Fair Value		$ (141,693,000)
Petroleum product swaps [member] | Exchange trade [member]
Disclosure of detailed information about hedging instruments [line items]
Volume | MMB	1.3	1.3	4.1
Fair Value		$ (99,680,000)	$ (688,016,000)

Derivative Financial Instrum122

Derivative Financial Instruments - Summary of Location on the Consolidated Statement of Financial Position and the Fair Value of DFIs (Detail) $ in Thousands, $ in Thousands	Dec. 31, 2017USD ($)	Dec. 31, 2017MXN ($)	Dec. 31, 2016MXN ($)
Disclosure of detailed information about financial instruments [line items]
Fair value	$ (896,864)	$ (17,745,979)	$ (30,867,956)
Derivatives liabilities		12,367,475	(26,010,486)
Derivatives not designated as hedges [member]
Disclosure of detailed information about financial instruments [line items]
Fair value		30,113,454	4,857,470
Derivatives liabilities		(17,745,979)	(30,867,956)
Derivatives not designated as hedges [member] | Crude oil options [member]
Disclosure of detailed information about financial instruments [line items]
Fair value		397,630
Derivatives liabilities		(5,407,817)
Derivatives not designated as hedges [member] | Currency Options [member]
Disclosure of detailed information about financial instruments [line items]
Fair value		4,968,159
Derivatives liabilities			(301,131)
Derivatives not designated as hedges [member] | Natural gas options [member]
Disclosure of detailed information about financial instruments [line items]
Fair value		398	11,548
Derivatives liabilities		(397)	(11,488)
Derivatives not designated as hedges [member] | Cross - currency swaps [member]
Disclosure of detailed information about financial instruments [line items]
Fair value		24,126,452	4,503,550
Derivatives liabilities		(10,301,983)	(30,380,405)
Derivatives not designated as hedges [member] | Natural gas swaps [member]
Disclosure of detailed information about financial instruments [line items]
Fair value		7,003	30,162
Derivatives liabilities		(6,182)	(27,438)
Derivatives not designated as hedges [member] | Interest rate swaps [member]
Disclosure of detailed information about financial instruments [line items]
Fair value		411,721	312,210
Derivatives liabilities		(22,870)	$ (147,494)
Derivatives not designated as hedges [member] | Others [member]
Disclosure of detailed information about financial instruments [line items]
Fair value		202,091
Derivatives liabilities		(269)
Derivatives not designated as hedges [member] | Forwards [member]
Disclosure of detailed information about financial instruments [line items]
Derivatives liabilities		$ (2,006,461)

Derivative Financial Instrum123

Derivative Financial Instruments - Summary of Net Gain (Loss) Recognized in Income on Derivative Financial Instruments (Detail) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of detailed information about financial instruments [line items]
Net gain loss on derivatives	$ 25,338,324	$ (14,000,987)	$ (21,449,877)
Derivatives not designated as hedges [member] | Forwards [member]
Disclosure of detailed information about financial instruments [line items]
Net gain loss on derivatives	(1,976,241)
Derivatives not designated as hedges [member] | Futures [member]
Disclosure of detailed information about financial instruments [line items]
Net gain loss on derivatives	(779,950)	(1,925,969)	1,387,177
Derivatives not designated as hedges [member] | Crude oil options [member]
Disclosure of detailed information about financial instruments [line items]
Net gain loss on derivatives	(3,771,604)
Derivatives not designated as hedges [member] | Currency Options [member]
Disclosure of detailed information about financial instruments [line items]
Net gain loss on derivatives	5,255,931	(298,789)
Derivatives not designated as hedges [member] | Natural gas options [member]
Disclosure of detailed information about financial instruments [line items]
Net gain loss on derivatives	673	(671)	4,786
Derivatives not designated as hedges [member] | Cross - currency swaps [member]
Disclosure of detailed information about financial instruments [line items]
Net gain loss on derivatives	27,747,290	(11,633,605)	(21,358,898)
Derivatives not designated as hedges [member] | Natural gas swaps [member]
Disclosure of detailed information about financial instruments [line items]
Net gain loss on derivatives	1,780	831	4,355
Derivatives not designated as hedges [member] | Propane swaps [member]
Disclosure of detailed information about financial instruments [line items]
Net gain loss on derivatives		(3,805)	(1,136,188)
Derivatives not designated as hedges [member] | Interest rate swaps [member]
Disclosure of detailed information about financial instruments [line items]
Net gain loss on derivatives	(34,306)	$ (138,979)	$ (351,109)
Derivatives not designated as hedges [member] | Others [member]
Disclosure of detailed information about financial instruments [line items]
Net gain loss on derivatives	$ (1,105,249)

Derivative Financial Instrum124

Derivative Financial Instruments - Schedule of Financial Assets and Liabilities Measured at Fair Value and Indicate the Fair Value Hierarchy of the Inputs Utilized to Determine the Fair Values (Detail) - MXN ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Derivative Financial Assets [member]
Disclosure of fair value measurement of assets and liabilities [Line Items]
Derivative financial instruments	$ 30,113,454	$ 4,857,470
Available-for-sale financial assets	1,056,918	8,880,219
Derivative liabilities [member]
Disclosure of fair value measurement of assets and liabilities [Line Items]
Derivative financial instruments	(17,745,979)	(30,867,956)
Level 1 [member] | Derivative Financial Assets [member]
Disclosure of fair value measurement of assets and liabilities [Line Items]
Available-for-sale financial assets		6,463,096
Level 2 [member] | Derivative Financial Assets [member]
Disclosure of fair value measurement of assets and liabilities [Line Items]
Derivative financial instruments	30,113,454	4,857,470
Available-for-sale financial assets	1,056,918	2,417,123
Level 2 [member] | Derivative liabilities [member]
Disclosure of fair value measurement of assets and liabilities [Line Items]
Derivative financial instruments	$ (17,745,979)	$ (30,867,956)

Financial Instruments - Schedul

Financial Instruments - Schedule of Carrying Value and the Estimated Fair Value of the Remaining Financial Assets and Liabilities (Detail) $ in Thousands, $ in Thousands	Dec. 31, 2017USD ($)	Dec. 31, 2017MXN ($)	Dec. 31, 2016USD ($)	Dec. 31, 2016MXN ($)	Dec. 31, 2015MXN ($)	Dec. 31, 2014MXN ($)
Disclosure Of Fair Value Financial Assets And Liabilities [Line Items]
Cash and cash equivalents	$ 4,945,330	$ 97,851,754	$ 8,264,769	$ 163,532,513	$ 109,368,880	$ 117,988,528
Accounts receivable, net	8,624,239	170,645,234		133,220,527
Long-term notes receivable	7,504,683	148,492,909		148,607,602
Suppliers	7,073,205	139,955,378		151,649,540
Accounts and accrued expenses payable	1,173,081	23,211,401		18,666,607
Short-term debt and current portion of long-term debt	7,945,209	157,209,467		176,166,188
Long-term debt	$ 95,046,956	1,880,665,604		1,807,004,542	$ 1,300,873,167
Fair value [member]
Disclosure Of Fair Value Financial Assets And Liabilities [Line Items]
Cash and cash equivalents		97,851,754		163,532,513
Accounts receivable, net		170,645,234		133,220,527
Long-term notes receivable		148,492,909		148,607,602
Suppliers		139,955,378		151,649,540
Accounts and accrued expenses payable		23,211,401		18,666,607
Short-term debt and current portion of long-term debt		157,209,467		176,166,188
Long-term debt		$ 1,996,173,753		$ 1,812,109,426

Employee Benefits - Summary of

Employee Benefits - Summary of Amounts Associated With PEMEX's Labor Obligations (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)	Dec. 31, 2017MXN ($)	Dec. 31, 2016MXN ($)	Dec. 31, 2015MXN ($)
Disclosure of defined benefit plans [line items]
Liability for defined benefits at retirement and post-employment at the end of the year				$ (103,860,955)
Total liability for defined benefits recognized in the consolidated statement of financial position at the end of the year	$ 2,530,255	$ 50,065,396	$ 47,293,069	$ (116,022,232)
PEMEX [member]
Disclosure of defined benefit plans [line items]
Liability for defined benefits at retirement and post-employment at the end of the year		1,241,072,307	1,202,624,665
Liability for other long-term benefits		17,363,815	17,784,771
Total liability for defined benefits recognized in the consolidated statement of financial position at the end of the year		$ 1,258,436,122	$ 1,220,409,436

Employee Benefits - Summary 127

Employee Benefits - Summary of Information Regarding PEMEX's Retirement and Post-Employment Benefits (Detail) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Actuarial (gains) losses in other comprehensive results due to:
Plan assets at the beginning of year	$ 9,489,666
Company contributions to the fund	63,500,000
Pension plan assets at the end of year	8,485,692	$ 9,489,666
Plan assets [member]
Changes in the liability for defined benefits
Defined benefit obligations at the beginning of the year	1,212,114,331	1,263,708,928
Recognition of the modifications in pensions plan	(6,609,657)	(571,713)
Current Service cost	19,762,661	23,107,851
Past service costs		(33,244)
Actuarial (gains) losses in other comprehensive results due to:
Remeasurements	(1,471)
Defined benefit liabilities at end of year	1,249,557,999	1,212,114,331
Plan assets at the beginning of year	9,489,666	5,228,909
Return on plan assets	902,550	742,477
Payments by the pension fund	(54,312,270)	(51,889,821)
Company contributions to the fund	51,952,559	55,693,256
Actuarial (gains) losses in plan assets	453,187	(285,155)
Pension plan assets at the end of year	8,485,692	9,489,666
Retirement And Post Employment Benefits [member]
Changes in the liability for defined benefits
Defined benefit obligations at the beginning of the year	1,202,624,665	1,258,480,019
Recognition of the modifications in pensions plan	8,327	(571,713)
Current Service cost	13,079,341	23,111,918
Net interest	95,402,917	90,527,624
Past service costs		(33,244)
Defined benefits paid by the fund	(5,105,669)	(4,892,767)
Actuarial (gains) losses in other comprehensive results due to:
Change in financial assumptions	47,182,448	(149,533,263)
Change in demographic assumptions	(70,012,604)	4,842,109
For experience during the year	10,272,231	36,103,857
In plan assets during the year	(453,206)	285,123
Remeasurements	26,417	(1,742)
Contributions paid to the fund	(51,952,560)	(55,693,256)
Defined benefit liabilities at end of year	$ 1,241,072,307	$ 1,202,624,665

Employee Benefits - Additional

Employee Benefits - Additional Information (Detail) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure of defined benefit plans [line items]
Net actuarial gains recognized in other comprehensive income	$ 12,038,710	$ 106,387,640
Percentage increase in discount and expected return on plan assets	12.46%
Expected contribution to the fund	$ 63,500,000
Expected payments	$ 62,337,560
Percentage of decrease in assumed variation rate	(15.72%)
Medical services of increase or decrease of one percentage point [member]
Disclosure of defined benefit plans [line items]
Percentage increase in discount and expected return on plan assets	21.93%
Percentage of decrease in assumed variation rate	(16.80%)
Actuarial assumption of discount rates [member]
Disclosure of defined benefit plans [line items]
Percentage increase in discount and expected return on plan assets	7.89%	8.17%

Employee Benefits - Summary 129

Employee Benefits - Summary of Amounts and Types of Plan Assets (Detail) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of fair value of plan assets [line items]
Cash and cash equivalents	$ 135,757	$ 5,906,660
Equity instruments	1,034,178	2,694,291
Debt instruments	7,315,757	888,715
Total plan assets	8,485,692	9,489,666
Change in the liability for defined benefits
Payments by the fund	(62,337,560)
Plan assets [member]
Disclosure of fair value of plan assets [line items]
Cash and cash equivalents	135,757	5,906,660
Equity instruments	1,034,178	2,694,291
Debt instruments	7,315,757	888,715
Total plan assets	8,485,692	9,489,666	$ 5,228,909
Change in the liability for defined benefits
Defined benefit obligations at the beginning of the year	1,212,114,331	1,263,708,928
Service costs	19,762,661	23,107,851
Financing costs	96,331,015	91,270,383
Past service costs		(33,244)
Payments by the fund	(59,417,940)	(56,778,359)
Amount of (gains) and losses recognized through other comprehensive income:	(12,594,541)	(108,589,515)
Modifications to the pension plan	(6,609,657)	(571,713)
Remeasurements	(1,471)
Reductions	(26,399)
Defined benefit liabilities at end of year	$ 1,249,557,999	$ 1,212,114,331

Employee Benefits - Summary 130

Employee Benefits - Summary of Additional Fair value Disclosure About Plan Assets and Indicate Their Rank (Detail) - MXN ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Disclosure of fair value of plan assets [line items]
Cash and cash equivalents	$ 135,757	$ 5,906,660
Equity instruments	1,034,178	2,694,291
Debt instruments	7,315,757	888,715
Total	8,485,692	9,489,666
Level 1 [member]
Disclosure of fair value of plan assets [line items]
Cash and cash equivalents	135,757	5,906,660
Equity instruments	1,034,178	2,694,291
Debt instruments	7,315,757	888,715
Total	$ 8,485,692	$ 9,489,666

Employee Benefits - DisclosureO

Employee Benefits - DisclosureOfSensitivityAnalysisForActuarialAssumptionsExplanatory (Detail)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Discount and return on plan assets rate	12.46%
Average length of obligation (years)	18 years 4 months 24 days	17 years 8 months 1 day
Actuarial assumption of expected rates of salary increases [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Discount and return on plan assets rate	4.77%	4.77%
Actuarial assumption of expected rates of pension increases [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Discount and return on plan assets rate	3.75%	3.75%
Medical services [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Discount and return on plan assets rate	7.65%	7.65%
Actuarial assumption of expected rates of inflation [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Discount and return on plan assets rate	3.75%	3.75%
Actuarial assumption of discount rates [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Discount and return on plan assets rate	7.89%	8.17%

Employee Benefits - Summary 132

Employee Benefits - Summary of Amounts Recognized for Long-term Obligations (Detail) - Other Long-term Benefits [member] - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Change in the liability for defined benefits
Defined benefit obligations at the beginning of the year	$ 17,784,771	$ 20,905,422
Charge to income for the year	3,277,847	3,420,158
Actuarial (gains) losses recognized in income due to:
Change in financial assumptions	878,516	(3,028,211)
Change in demographic assumptions	(1,015,274)	(119,982)
For experience during the year	(3,558,599)	(3,390,396)
Benefits paid	(3,446)	(2,220)
Defined benefit liabilities at end of year	$ 17,363,815	$ 17,784,771

Employee Benefits - Summary 133

Employee Benefits - Summary of Principal Actuarial Assumptions Used in Determining the Defined Benefit Obligation (Detail)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Discount and return on plan assets rate	12.46%
Average length of obligation (years)	18 years 4 months 24 days	17 years 8 months 1 day
Actuarial assumption of expected rates of salary increases [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Discount and return on plan assets rate	4.77%	4.77%
Actuarial assumption of expected rates of inflation [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Discount and return on plan assets rate	3.75%	3.75%
Actuarial assumption of discount rates [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Discount and return on plan assets rate	7.89%	8.17%
Other Long-term Benefits [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Average length of obligation (years)	18 years 4 months 24 days	17 years 8 months 2 days
Other Long-term Benefits [member] | Actuarial assumption of expected rates of salary increases [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Discount and return on plan assets rate	4.77%	4.77%
Other Long-term Benefits [member] | Actuarial assumption of expected rates of inflation [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Discount and return on plan assets rate	3.75%	3.75%
Other Long-term Benefits [member] | Actuarial assumption of discount rates [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Discount and return on plan assets rate	7.89%	8.17%

Provisions for Sundry Credit134

Provisions for Sundry Creditors - Summary of Provisions for Sundry Creditors and Others (Detail) $ in Thousands, $ in Thousands	Dec. 31, 2017USD ($)	Dec. 31, 2017MXN ($)	Dec. 31, 2016MXN ($)	Dec. 31, 2015MXN ($)
Disclosure of other provisions [abstract]
Provision for plugging of wells (Note 12)		$ 68,797,600	$ 64,967,710	$ 56,894,695
Provision for trails in process (Note 25)		7,812,689	15,119,692	12,775,263
Provision for environmental costs		11,067,134	8,230,476	$ 3,521,838
Provisions	$ 4,431,129	$ 87,677,423	$ 88,317,878

Provisions for Sundry Credit135

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, 2017	Dec. 31, 2016
Disclosure of other provisions [abstract]
Balance at the beginning of the year	$ 64,967,710	$ 56,894,695
Decrease capitalized in fixed assets	(3,791,482)	(3,878,503)
Unwinding of discount against income	7,774,000	11,968,966
Amount used	(152,628)	(17,448)
Balance at the end of the year	68,797,600	64,967,710
Balance at the beginning of the year	15,119,692	12,775,263
Additions against income	2,835,357	3,049,202
Provision cancellation	(1,973,153)	(632,806)
Amount used	(8,169,207)	(71,967)
Balance at the end of the year	7,812,689	15,119,692
Balance at the beginning of the year	8,230,476	3,521,838
Additions against income	3,203,982	6,118,454
Provision cancellation	(312,937)	(1,347,285)
Amount used	(54,387)	(62,531)
Balance at the end of the year	$ 11,067,134	$ 8,230,476

Provisions for Sundry Credit136

Provisions for Sundry Creditors - Additional Information (Detail)	Dec. 31, 2017
Bottom of range [member]
Disclosure of other provisions [line items]
Present value is determined based on discount rates	4.00%
Top of range [member]
Disclosure of other provisions [line items]
Present value is determined based on discount rates	10.50%

Disclosures of Cash Flow - Summ

Disclosures of Cash Flow - Summary of Non-cash Transactions and are Presented for Disclosure Purposes (Detail) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating activities
Employee benefits equity effect	$ 12,038,710	$ 106,277,761	$ 78,556,569
Net (benefits) cost of the year for employee benefits	108,073,074	109,738,416	(62,549,142)
Investing activities
Available-for-sale financial assets	5,564,130	207,817	(3,206,316)
Financing activities
Financed Public Works Contracts		146,217,292	2,001,093
Currency translation effect	(7,597,283)	21,386,902	13,262,101
Accrued interest	$ 8,734,131	$ 9,326,945	$ 4,816,784

Income Taxes and Federal Dut138

Income Taxes and Federal Duties - Additional Information (Detail) $ in Thousands	Jan. 01, 2019	Dec. 31, 2017MXN ($)$ / km²	Nov. 30, 2017MXN ($)	Aug. 18, 2017MXN ($)	Jan. 01, 2017	Nov. 16, 2016MXN ($)	Apr. 18, 2016MXN ($)	Jan. 01, 2016	Dec. 31, 2017MXN ($)$ / km²$ / l$ / T	Dec. 31, 2016MXN ($)
Disclosure of Income Tax [Line items]
Decrease in applicable tax rate		65.00%
Profit sharing duty | $									$ 338,044,209	$ 277,161,804
Tax benefit from exploration and extraction activities | $			$ 8,854,391	$ 7,769,915			$ 40,213,913
Compensation authorized for exploration and extraction activities | $									2,186,963
Fiscal support (Profit-sharing duty) | $						$ 28,439,379				28,439,379
Payments made for extraction duty | $									58,523,125
Payments made for exploration duty | $									$ 980,843
Payments made for exploration and extraction duty | $		$ 3,986,112
Applicable tax rate									30.00%
Tax regime applicable to assignments [member]
Disclosure of Income Tax [Line items]
Tax payable for non-producing areas | $ / km²		1,214.21							1,214.21
Tax payable for non-producing areas increased amount | $ / km²		2,903.54							2,903.54
Tax payable for exploration phase | $ / km²		1,583.74							1,583.74
Tax payable for extraction phase | $ / km²		6,334.98							6,334.98
Tax regime applicable to contracts [member]
Disclosure of Income Tax [Line items]
Tax payable for non-producing areas | $ / km²		1,175.42							1,175.42
Tax payable for non-producing areas increased amount | $ / km²		2,810.78							2,810.78
Tax payable for exploration phase | $ / km²		1,583.74							1,583.74
Tax payable for extraction phase | $ / km²		6,334.98							6,334.98
Exploration [member]
Disclosure of Income Tax [Line items]
Applicable tax rate of profit-sharing duty					67.50%			68.75%
Decrease in applicable tax rate	65.00%
Profit sharing duty | $									$ 372,902,629	304,299,019
Profit sharing duty monthly installment | $									377,192,377	301,050,325
Profit sharing duty payable | $									$ 4,289,748	$ 3,248,694
Sale of Automotive Fuels [member] | Magna Gasoline [member]
Disclosure of Income Tax [Line items]
Special tax on production and services (IEPS Tax)									4.30
Sale of Automotive Fuels [member] | Premium Gasoline [member]
Disclosure of Income Tax [Line items]
Special tax on production and services (IEPS Tax)									3.64
Sale of Automotive Fuels [member] | Diesel [member]
Disclosure of Income Tax [Line items]
Special tax on production and services (IEPS Tax)									4.73
States and Municipalities [member] | Magna Gasoline [member]
Disclosure of Income Tax [Line items]
Special tax on production and services (IEPS Tax)									38
States and Municipalities [member] | Premium Gasoline [member]
Disclosure of Income Tax [Line items]
Special tax on production and services (IEPS Tax)									46.37
States and Municipalities [member] | Diesel [member]
Disclosure of Income Tax [Line items]
Special tax on production and services (IEPS Tax)									31.54
Fossil Fuels [member] | Diesel [member]
Disclosure of Income Tax [Line items]
Special tax on production and services (IEPS Tax)									13.84
Fossil Fuels [member] | Propane [member]
Disclosure of Income Tax [Line items]
Special tax on production and services (IEPS Tax)									6.50
Fossil Fuels [member] | Butane [member]
Disclosure of Income Tax [Line items]
Special tax on production and services (IEPS Tax)									8.42
Fossil Fuels [member] | Jet and Other Fuel [member]
Disclosure of Income Tax [Line items]
Special tax on production and services (IEPS Tax)									11.41
Fossil Fuels [member] | Turbosine and Other Kerosene [member]
Disclosure of Income Tax [Line items]
Special tax on production and services (IEPS Tax)									13.64
Fossil Fuels [member] | Fuel Oil [member]
Disclosure of Income Tax [Line items]
Special tax on production and services (IEPS Tax)									14.78
Fossil Fuels [member] | Petroleum Coke [member]
Disclosure of Income Tax [Line items]
Special tax on production and services (IEPS Tax) | $ / T									17.15

Income Taxes and Federal Dut139

Income Taxes and Federal Duties - Summary of Total DUC and Others (Detail) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Duties And Others [Line Items]
DUC	$ (338,044,209)	$ (277,161,804)
DUC from prior years	(2,095,429)
Other	(260,775)	(514,356)
DUC [member]
Disclosure Of Duties And Others [Line Items]
DUC	372,902,629	304,299,019
DUC from prior years	2,095,429
Other	260,775	514,356
Deferred DUC benefit	(37,214,624)	(27,651,571)
Total DUC and other	$ 338,044,209	$ 277,161,804

Income Taxes And Federal Dut140

Income Taxes And Federal Duties - Summary of Principal Factors Generating the Deferred DUC (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017MXN ($)	Dec. 31, 2016MXN ($)	Dec. 31, 2017USD ($)	Dec. 31, 2017MXN ($)	Dec. 31, 2015MXN ($)
Deferred DUC asset
Provisions		$ 88,317,878	$ 4,431,129	$ 87,677,423
Total deferred DUC asset		(100,324,689)	(7,388,422)	(146,192,485)
Deferred Profit-sharing duty liability
Wells, pipelines, properties, plant and equipment		(1,667,742,248)	(72,599,743)	(1,436,509,326)	$ (1,344,483,631)
Deferred DUC liability		4,134,536	$ 214,988	4,253,928
DUC [member]
Deferred DUC asset
Provisions		570,544,863		541,360,940
Total deferred DUC asset		570,544,863		541,360,940
Deferred Profit-sharing duty liability
Wells, pipelines, properties, plant and equipment		(473,406,721)		(455,697,786)
Deferred DUC liability		(473,406,721)		(455,697,786)
Deferred asset net		97,138,142		85,663,154
Valuation reserve	$ (20,796,959)	(69,486,571)
Net, deferred DUC asset		$ 27,651,571		$ 64,866,195

Income Taxes And Federal Dut141

Income Taxes And Federal Duties - Summary of Expected Benefit for DUC (Detail) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Expected Benefit For DUC [Abstract]
Expected expense	$ 127,436,912	$ 159,897,683
Increase (decrease) resulting from:
Non-cumulative profit	(514,780,219)	(423,761,673)
Non-deductible expenses	387,343,306	263,863,990
Production value	518,433,469	441,655,000
Deductible duties	(39,503,110)	(29,918,201)
Deferred DUC reserve	(48,689,612)	69,486,571
Deductions cap	(94,552,741)	(204,575,922)
DUC from prior years	2,095,429
Other	260,775	514,356
DUC-Profit-sharing duty expense	$ 338,044,209	$ 277,161,804

Income Taxes And Federal Dut142

Income Taxes And Federal Duties - Summary of Income Tax Expense (Benefit) (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)	Dec. 31, 2017MXN ($)	Dec. 31, 2016MXN ($)	Dec. 31, 2015MXN ($)
Disclosure Of Income Taxes [Line Items]
Income tax expense	$ (255,938)	$ (5,064,168)	$ (12,640,369)	$ (45,587,267)
PEMEX [member]
Disclosure Of Income Taxes [Line Items]
Current income tax		3,546,912	6,201,842	7,426,892
Deferred income tax		(9,334,064)	(18,842,211)	(53,014,159)
Income tax expense		(5,787,152)	$ (12,640,369)	$ (45,587,267)
Income tax REFIPRE (Preferent Fiscal Regime)		$ 722,984

Income Taxes and Federal Dut143

Income Taxes and Federal Duties - Summary of Principal Factors Generating Deferred Income Tax (Detail) $ in Thousands, $ in Thousands	Dec. 31, 2017USD ($)	Dec. 31, 2017MXN ($)	Dec. 31, 2016MXN ($)	Dec. 31, 2015MXN ($)
Deferred income tax asset:
Total deferred income tax asset	$ (7,388,422)	$ (146,192,485)	$ (100,324,689)
PEMEX [member]
Deferred income tax asset:
Provisions		8,299,818	5,906,581	$ 25,414,822
Employee benefits provision		130,075,323	125,973,332	247,834,882
Advance payments from clients		2,774,306	1,046,010	1,015,357
Accrued liabilities		371,987	2,269,561	1,514
Non-recoverable accounts receivable		739,748	778,179	104,346
Derivative financial instruments		79,255	223,518	22,506
Wells, pipelines, properties and equipment		405,439,818	458,273,897	446,970,333
Tax loss carryforwards		34,110,960	43,327,737	14,894,231
Total deferred income tax asset		581,891,215	637,798,815	736,257,991
Valuation reserve		(500,564,925)	(565,125,697)	(681,357,607)
Deferred asset net		81,326,290	72,673,118	54,900,384
Deferred income tax liability:
Wells, pipelines, properties plant and equipment		(3,443,618)	(3,632,294)	(1,909,529)
Other		(810,310)	(502,242)	(274,305)
Total deferred income tax liability		(4,253,928)	(4,134,536)	(2,183,834)
Net long-term deferred income tax liability		77,072,362	68,538,582	$ 52,716,550
PEMEX [member] | Recognized in profit and loss [member]
Deferred income tax asset:
Provisions		2,393,237	(19,508,241)
Employee benefits provision		4,902,275	(119,837,137)
Advance payments from clients		1,728,296	30,653
Accrued liabilities		(1,897,574)	2,268,047
Non-recoverable accounts receivable		(38,431)	673,833
Derivative financial instruments		(144,263)	201,012
Wells, pipelines, properties and equipment		(52,834,079)	11,303,564
Tax loss carryforwards		(9,216,777)	28,433,506
Total deferred income tax asset		(55,107,316)	(96,434,763)
Valuation reserve		64,560,772	116,231,910
Deferred asset net		9,453,456	19,797,147
Deferred income tax liability:
Wells, pipelines, properties plant and equipment		188,676	(726,999)
Other		(308,068)	(227,937)
Total deferred income tax liability		(119,392)	(954,936)
Net long-term deferred income tax liability		9,334,064	18,842,211
PEMEX [member] | Recognized in OCI and equity [member]
Deferred income tax asset:
Employee benefits provision		(800,284)	(2,024,413)
Total deferred income tax asset		(800,284)	(2,024,413)
Deferred asset net		(800,284)	(2,024,413)
Deferred income tax liability:
Wells, pipelines, properties plant and equipment			(995,766)
Total deferred income tax liability			(995,766)
Net long-term deferred income tax liability		$ (800,284)	$ (3,020,179)

Income Taxes and Federal Dut144

Income Taxes and Federal Duties - Summary of Principal Factors Generating Deferred Income Tax (Parenthetical) (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2017MXN ($)
Disclosure of income taxes [abstract]
Tax loss carryforwards expire	2,027
Business combination in equity	$ (995,766)

Income Taxes and Federal Dut145

Income Taxes and Federal 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, 2017USD ($)	Dec. 31, 2017MXN ($)	Dec. 31, 2016MXN ($)	Dec. 31, 2015MXN ($)
Disclosure Of Income Taxes [Line Items]
Income tax expense	$ (255,938)	$ (5,064,168)	$ (12,640,369)	$ (45,587,267)
Deferred tax effect of gains and losses		(800,284)
PEMEX [member]
Disclosure Of Income Taxes [Line Items]
Expected income tax expense		(20,055,588)	(14,901,324)	(3,089,241)
Tax effect of inflation-net		14,302,118	8,098,213	(1,618,327)
Difference between accounting and tax depreciation		(3,713,920)	(1,765,183)	(107,231)
Non-deductible expenses		1,954,659	1,558,120	(1,921,515)
Others-net		(1,725,579)	(5,630,195)	(38,850,953)
Income tax expense		$ (5,787,152)	$ (12,640,369)	$ (45,587,267)

Income Taxes and Federal Dut146

Income Taxes and Federal Duties - Summary of Expense (Benefit) Attributable to Profit (Loss) from Continuing Operations before Income Taxes (Parenthetical) (Detail) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure Of Income Taxes [Line Items]
Deferred tax effect of gains and losses	$ (800,284)
Accumulated effect on deferred tax of gains and losses from actuarial gains and losses	17,688,032	$ 16,887,748
PMI CIM [member]
Disclosure Of Income Taxes [Line Items]
Deferred tax effect of gains and losses	$ (2,024,413)		$ (124,285)

Equity (Deficit), Net - Additio

Equity (Deficit), Net - Additional Information (Detail) - MXN ($) $ in Thousands	Apr. 21, 2016	Dec. 24, 2015	Jul. 01, 2015	Jan. 19, 2015	Aug. 15, 2016	Dec. 31, 2017	Dec. 31, 2016	Aug. 03, 2016	Jun. 29, 2016
Disclosure of equity [Line Items]
Acquisition percentage of shares			100.00%
Gain (loss) on non-controlling interest						$ 965,107	$ 976,705
Contributions A [member]
Disclosure of equity [Line Items]
Equity contribution	$ 26,500,000			$ 10,000,000
Issue of a non-negotiable promissory note		$ 50,000,000
Maturity date on promissory note		Dec. 31, 2050
Promissory note issued								$ 184,230,586	$ 184,230,586
Increase amount in equity		$ 135,439,612
Increase in the discount value of the promissory notes					$ 1,209,026

Equity (Deficit ), Net - Summar

Equity (Deficit ), Net - Summary of Permanent Equity (Detail) - Contributions A [member] - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure of equity [Line Items]
Certificates of Contribution, Beginning Balance	$ 356,544,447	$ 194,604,835
Increase in Certificates of Contribution during period	0	161,939,612
Certificates of Contribution, Ending Balance	$ 356,544,447	$ 356,544,447

Other Revenues and Expenses - N

Other Revenues and Expenses - Net - Summary of Other Revenues and Expenses, net (Detail) - MXN ($) $ in Thousands	Nov. 16, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenues:
Claims recovery		$ 16,386,250	$ 3,695,217	$ 1,975,281
Fiscal support (Profit-sharing duty)	$ 28,439,379		28,439,379
Other income for services		4,720,546	4,266,854	3,953,888
Price of sale share		3,139,103	22,684,736
Other		4,277,207	14,228,801	6,992,954
Revenues from reinsurance premiums		1,986,568	3,694,026	1,497,779
Franchise fees		917,934	1,059,333	1,148,528
Bidding terms, sanctions, penalties and other		825,956	3,223,437	1,262,458
Gain on sale of fixed assets			2,687,652
Assets value transferred to CENAGAS			7,450,931
Negative IEPS				2,519,126
Total other revenues		32,253,564	91,430,366	19,350,014
Expenses:
Loss in the Assets value transferred to CENAGAS			(35,333,411)
Disposal of assets		(8,447,031)	(2,140,943)	(3,364,063)
Transportation and distribution of natural gas		(6,652,878)	(8,830,967)	(369,317)
Other		(7,927,150)	(3,581,036)	(726,589)
Claims		(3,640,036)	(4,757,116)	(12,527,548)
Loss in the sale of associates		(412,393)	(7,473,698)
Impairment of goodwill			(4,007,018)
Services provided			(2,656,571)	(3,237,984)
Total other expenses		(27,079,488)	(68,780,760)	(20,225,501)
Other revenues and expenses-net		$ 5,174,076	$ 22,649,606	$ (875,487)

Related Parties - Summary of Ow

Related Parties - Summary of Ownership Interests (Detail)	Dec. 31, 2017
Servicio Cozumel SA de CV [member] | Pedro Joaquin Coldwell [member]
Disclosure of transactions between related parties [line items]
Ownership share, percentage	60.00%
Servicio Cozumel SA de CV [member] | Pedro Oscar Joaquin Delbouis [member]
Disclosure of transactions between related parties [line items]
Ownership share, percentage	20.00%
Servicio Cozumel SA de CV [member] | Nassim Joaquin Delbouis [member]
Disclosure of transactions between related parties [line items]
Ownership share, percentage	20.00%
Planta de Combustible Cozumel, S. A. de C. V [member] | Pedro Joaquin Coldwell [member]
Disclosure of transactions between related parties [line items]
Ownership share, percentage	40.00%
Planta de Combustible Cozumel, S. A. de C. V [member] | Fideicomiso Testamentario [member]
Disclosure of transactions between related parties [line items]
Ownership share, percentage	57.00%
Gasolinera y Servicios Juarez, S. A. de C. V [member] | Pedro Joaquin Coldwell [member]
Disclosure of transactions between related parties [line items]
Ownership share, percentage	40.00%
Gasolinera y Servicios Juarez, S. A. de C. V [member] | Fideicomiso Testamentario [member]
Disclosure of transactions between related parties [line items]
Ownership share, percentage	40.00%
Gasolinera y Servicios Juarez, S. A. de C. V [member] | Ignacio Nassim Ruiz Joaquin [member]
Disclosure of transactions between related parties [line items]
Ownership share, percentage	20.00%
Combustibles Caleta, S. A. de C. V [member] | Pedro Joaquin Coldwell [member]
Disclosure of transactions between related parties [line items]
Ownership share, percentage	20.00%
Combustibles Caleta, S. A. de C. V [member] | Pedro Oscar Joaquin Delbouis [member]
Disclosure of transactions between related parties [line items]
Ownership share, percentage	20.00%
Combustibles Caleta, S. A. de C. V [member] | Nassim Joaquin Delbouis [member]
Disclosure of transactions between related parties [line items]
Ownership share, percentage	20.00%
Combustibles Caleta, S. A. de C. V [member] | Fideicomiso Testamentario [member]
Disclosure of transactions between related parties [line items]
Ownership share, percentage	20.00%
Combustibles Caleta, S. A. de C. V [member] | Ignacio Nassim Ruiz Joaquin [member]
Disclosure of transactions between related parties [line items]
Ownership share, percentage	20.00%
Combustibles San Miguel, S. A. de C. V [member] | Pedro Joaquin Coldwell [member]
Disclosure of transactions between related parties [line items]
Ownership share, percentage	25.00%
Combustibles San Miguel, S. A. de C. V [member] | Pedro Oscar Joaquin Delbouis [member]
Disclosure of transactions between related parties [line items]
Ownership share, percentage	25.00%
Combustibles San Miguel, S. A. de C. V [member] | Nassim Joaquin Delbouis [member]
Disclosure of transactions between related parties [line items]
Ownership share, percentage	25.00%
Combustibles San Miguel, S. A. de C. V [member] | Ignacio Nassim Ruiz Joaquin [member]
Disclosure of transactions between related parties [line items]
Ownership share, percentage	25.00%

Related Parties - Summary of151

Related Parties - Summary of Ownership Interests (Parenthetical) (Detail)	Jun. 30, 2016	Jun. 30, 2016	Dec. 31, 2017
Planta de Combustible Cozumel, S. A. de C. V [member] | Pedro Joaquin Coldwell [member]
Disclosure of transactions between related parties [line items]
Ownership share, percentage			40.00%
Planta de Combustible Cozumel, S. A. de C. V [member] | Pedro Oscar Joaquin Delbouis [member]
Disclosure of transactions between related parties [line items]
Percentage of voting rights exercised		50.00%
Planta de Combustible Cozumel, S. A. de C. V [member] | Nassim Joaquin Delbouis [member]
Disclosure of transactions between related parties [line items]
Percentage of voting rights exercised		50.00%
Planta de Combustible Cozumel, S. A. de C. V [member] | Fausto Nassim JoaquinIbarra [member]
Disclosure of transactions between related parties [line items]
Ownership share, percentage	60.00%	60.00%
Percentage of shares become property of an investment		57.00%
Gasolinera y Servicios Juarez, S. A. de C. V [member] | Pedro Joaquin Coldwell [member]
Disclosure of transactions between related parties [line items]
Ownership share, percentage			40.00%
Percentage of voting rights exercised	100.00%
Gasolinera y Servicios Juarez, S. A. de C. V [member] | Fausto Nassim JoaquinIbarra [member]
Disclosure of transactions between related parties [line items]
Ownership share, percentage	40.00%	40.00%
Combustibles Caleta, S. A. de C. V [member] | Pedro Joaquin Coldwell [member]
Disclosure of transactions between related parties [line items]
Ownership share, percentage			20.00%
Combustibles Caleta, S. A. de C. V [member] | Pedro Oscar Joaquin Delbouis [member]
Disclosure of transactions between related parties [line items]
Ownership share, percentage			20.00%
Percentage of voting rights exercised	50.00%
Combustibles Caleta, S. A. de C. V [member] | Nassim Joaquin Delbouis [member]
Disclosure of transactions between related parties [line items]
Ownership share, percentage			20.00%
Percentage of voting rights exercised	50.00%
Combustibles Caleta, S. A. de C. V [member] | Fausto Nassim JoaquinIbarra [member]
Disclosure of transactions between related parties [line items]
Ownership share, percentage	20.00%	20.00%

Related Parties - Additional In

Related Parties - Additional Information (Detail) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of transactions between related parties [abstract]
Aggregate compensation of executive officers	$ 50,749	$ 49,165	$ 116,930
Accrued or paid key management personnel compensation	$ 7,525	8,339	$ 17,899
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	$ 3,466	$ 2,415

Commitments - Additional inform

Commitments - Additional information (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)	Dec. 31, 2017MXN ($)	Dec. 31, 2016MXN ($)	Dec. 31, 2015MXN ($)
Disclosure of commitments [Line Items]
Nitrogen to be supplied			$ 7,506,619	$ 8,646,726
Contract term	25 years	25 years
Contract payments	$ 591,011	$ 11,694,162	15,664,703	$ (51,135,948)
Outstanding contracts payments		0
Northern Region [member]
Disclosure of commitments [Line Items]
Contract payments		6,594,486	7,026,822
Southern Region [member]
Disclosure of commitments [Line Items]
Contract payments		$ 727,331	$ 524,475

Commitments - Estimated Future

Commitments - Estimated Future Payments Under Contract (Detail) - Nitrogen supply contract [member] $ in Thousands	12 Months Ended
	Dec. 31, 2017MXN ($)
Commitments and contingencies [Line Items]
2,018	$ 773,047
2,019	783,197
2,020	785,670
2,021	786,323
2,022	782,584
2023 and thereafter	3,595,798
Total	$ 7,506,619

Commitments - Estimated Value o

Commitments - Estimated Value of Contracts (Detail) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Financing performance of works [member]
Commitments and contingencies [Line Items]
Estimated value of contracts	$ 12,403,910	$ 16,513,175
Financing performance of works [member] | 2017 [member]
Commitments and contingencies [Line Items]
Estimated value of contracts	5,533,174	7,366,247
Financing performance of works [member] | 1 to 3 years [member]
Commitments and contingencies [Line Items]
Estimated value of contracts	1,891,557	2,518,207
Financing performance of works [member] | 2021 [member]
Commitments and contingencies [Line Items]
Estimated value of contracts	1,856,006	2,470,878
Financing performance of works [member] | 2022 and thereafter [member]
Commitments and contingencies [Line Items]
Estimated value of contracts	3,123,173	4,157,843
Infrastructure and service works [member]
Commitments and contingencies [Line Items]
Estimated value of contracts	698,905,230	817,994,130
Infrastructure and service works [member] | 2017 [member]
Commitments and contingencies [Line Items]
Estimated value of contracts	229,738,368	347,606,848
Infrastructure and service works [member] | 1 to 3 years [member]
Commitments and contingencies [Line Items]
Estimated value of contracts	196,335,411	281,563,607
Infrastructure and service works [member] | 2021 [member]
Commitments and contingencies [Line Items]
Estimated value of contracts	123,159,215	69,541,826
Infrastructure and service works [member] | 2022 and thereafter [member]
Commitments and contingencies [Line Items]
Estimated value of contracts	$ 149,672,236	$ 119,281,849

Contingencies - Additional Info

Contingencies - Additional Information (Detail)	Dec. 12, 2017MXN ($)	Aug. 01, 2017USD ($)	Aug. 01, 2017MXN ($)	Jun. 11, 2015MXN ($)	Jul. 08, 2011MXN ($)	Apr. 04, 2011USD ($)	Jun. 30, 2016USD ($)	Dec. 31, 2017USD ($)	Dec. 31, 2017MXN ($)	Dec. 31, 2016MXN ($)
Disclosure of contingent liabilities [line items]
Accrued reserve on contingent liabilities									$ 7,812,689,000	$ 15,119,692,000
Legal proceedings damage sought by plaintiffs	$ 153,000,000	$ 12,820	$ 800,000,000	$ 2,094,232,000	$ 1,552,730,000	$ 193,713,000	$ 120,856,000
Contingent Liability for Guarantees [Member] | Exploration [member]
Disclosure of contingent liabilities [line items]
Exploration and evaluation costs								$ 320,000,000
Contingent Liability for Guarantees [Member] | Exploration [member] | Deep Water License Modality Trion Field [Member]
Disclosure of contingent liabilities [line items]
Exploration and evaluation costs								4,000,000,000
Contingent Liability for Guarantees [Member] | Exploration [member] | Cinturon Plegado Perdido [member]
Disclosure of contingent liabilities [line items]
Exploration and evaluation costs								3,333,000,000
Contingent Liability for Guarantees [Member] | Exploration [member] | Ek Balam Fields [member]
Disclosure of contingent liabilities [line items]
Exploration and evaluation costs								5,000,000,000
Contingent Liability for Guarantees [Member] | Exploration [member] | Tampico Misantla [member]
Disclosure of contingent liabilities [line items]
Exploration and evaluation costs								1,750,000,000
Contingent Liability for Guarantees [Member] | Exploration [member] | Cuencas Del Sureste [member]
Disclosure of contingent liabilities [line items]
Exploration and evaluation costs								1,250,000,000
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								255,000,000
Contingent Liability for Guarantees [Member] | Exploration [member] | Ogarrio Field [member]
Disclosure of contingent liabilities [line items]
Exploration and evaluation costs								250,000,000
Contingent Liability for Guarantees [Member] | Exploration [member] | Cardenas And Mora Fields [member]
Disclosure of contingent liabilities [line items]
Exploration and evaluation costs								$ 250,000,000

Business Combination - Addition

Business Combination - Additional Information (Detail) - Fertinal [member] $ in Thousands, $ in Thousands	Jan. 28, 2016USD ($)	Dec. 31, 2017	Jan. 28, 2016MXN ($)
Disclosure of detailed information about business combination [line items]
Percentage oustanding shares acquired	99.99%		99.99%
Total purchase price			$ 4,322,826
Credit lines under a simple credit agreement	$ 425,800
Debt maturity period	16 years
Total assets, net			315,808
Goodwill			$ 4,007,018
Percentage of domestic market to cover		50.00%

Business Combination - Net Fair

Business Combination - Net Fair Value of Assets and Liabilities at Acquisition Date (Detail) - Fertinal [member] $ in Thousands	Jan. 28, 2016MXN ($)
Disclosure of detailed information about business combination [line items]
Cash and cash equivalents	$ (6,943)
Accounts receivable	102,121
Inventories	762,254
Properties, plant and equipment	9,811,928
Other assets	1,671,718
Total assets	12,341,078
Accounts payable	2,331,540
Debt	9,365,152
Deferred taxes	328,578
Total liabilities	12,025,270
Total assets, net	315,808
Transaction value	4,322,826
Goodwill	$ 4,007,018

Subsequent Events - Additional

Subsequent Events - Additional Information (Detail) € in Thousands, SFr in Thousands, $ in Thousands, $ in Thousands

Apr. 27, 2018USD ($)$ / $$ / Barrel

Mar. 05, 2018USD ($)

Feb. 18, 2018USD ($)

Feb. 12, 2018USD ($)

Mar. 31, 2017USD ($)

Dec. 31, 2017USD ($)$ / $$ / Barrel

Dec. 31, 2017MXN ($)$ / Barrel

Dec. 31, 2016MXN ($)

Dec. 31, 2015MXN ($)

Jun. 16, 2017USD ($)

Jun. 15, 2017USD ($)

Feb. 14, 2017EUR (€)

Dec. 13, 2016USD ($)

Sep. 21, 2016USD ($)

Jun. 14, 2016CHF (SFr)

Mar. 15, 2016USD ($)

Mar. 15, 2016EUR (€)

Feb. 04, 2016USD ($)

Disclosure of non-adjusting events after reporting period [line items]

Debt securities issued

$ 4,000,000

Repayment of revolving credit lines

$ 32,342,434

$ 642,059,819

$ 614,987,329

$ 193,618,498

Exchange rates | $ / $

19.7867

Weighted average price of crude oil | $ / Barrel

56.19

56.19

Damage claimed

$ 139,870

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

Disclosure of non-adjusting events after reporting period [line items]

Repayment of revolving credit lines

$ 14,914,000

Outstanding of revolving credit lines

$ 227,500

Series C medium term notes program [member]

Disclosure of non-adjusting events after reporting period [line items]

Debt securities issued

92,000,000

$ 92,000,000

$ 72,000,000

€ 4,250,000

$ 5,500,000

$ 62,000,000

SFr 375,000

$ 62,000,000

€ 2,250,000

$ 5,000,000

Subsequent Event [member]

Disclosure of non-adjusting events after reporting period [line items]

Exchange rates | $ / $

19.0530

Appreciation of foreign currency exchange rate

3.70%

Weighted average price of crude oil | $ / Barrel

60.89

Percentage of average price

8.30%

Subsequent Event [member] | P.M.I. Holdings, B.V. [member]

Disclosure of non-adjusting events after reporting period [line items]

Obtain of revolving credit lines

$ 7,126,000

Repayment of revolving credit lines

6,126,000

Outstanding of revolving credit lines

$ 1,227,500

Five Point Three Five Percentage Notes Due Twenty Twenty Eight [member] | Series C medium term notes program [member]

Disclosure of non-adjusting events after reporting period [line items]

Debt securities issued

$ 2,500,000,000

Interest rate

5.35%

Maturity

2,028

Six Point Three Five Percentage Notes Due Twenty Fourty Eight [Member] | Series C medium term notes program [member]

Disclosure of non-adjusting events after reporting period [line items]

Interest rate

6.35%

Maturity

2,048

Bonds issued

$ 1,500,000,000

Five Point Five Zero Zero Percentage Bonds Due Twenty Fourty Four [Member] | Series C medium term notes program [member]

Disclosure of non-adjusting events after reporting period [line items]

Interest rate

5.50%

Maturity

2,044

Bonds exchanged amount

$ 952,454

New Six Point Three Five Zero Percentage Bonds Due Twenty Fourty Eight [Member] | Series C medium term notes program [member]

Disclosure of non-adjusting events after reporting period [line items]

Interest rate

6.35%

Maturity

2,048

Bonds exchanged amount

$ 881,899

Five Point Six Two Five Percentage Bonds Due Twenty Fourty Six [Member] | Series C medium term notes program [member]

Disclosure of non-adjusting events after reporting period [line items]

Interest rate

5.625%

Maturity

2,046

Bonds exchanged amount

$ 1,021,065

Six Point Three Five Percentage Bonds Due Twenty Fourty Eight [Member] | Series C medium term notes program [member]

Disclosure of non-adjusting events after reporting period [line items]

Interest rate

6.35%

Maturity

2,048

Bonds exchanged amount

$ 946,764

Three Point One Two Five Percentage Bonds Repurchased Due Twenty Ninteen [Member]

Disclosure of non-adjusting events after reporting period [line items]

Interest rate

3.125%

Maturity

2,019

Bonds purchased

$ 138,598

Five Point Five Zero Zero Percentage Bonds Repurchased Due Twenty Ninteen [Member]

Disclosure of non-adjusting events after reporting period [line items]

Interest rate

5.50%

Maturity

2,019

Bonds purchased

$ 558,644

Eight Point Zero Zero Zero Percentage Bonds Repurchased Due Twenty Ninteen [Member]

Disclosure of non-adjusting events after reporting period [line items]

Interest rate

8.00%

Maturity

2,019

Bonds purchased

$ 91,843

Six Point Zero Zero Zero Percentage Bonds Repurchased Due Twenty Twenty [Member]

Disclosure of non-adjusting events after reporting period [line items]

Interest rate

6.00%

Maturity

2,020

Bonds purchased

$ 183,017

Three Point Five Zero Zero Percentage Bonds Repurchased Due Twenty Twenty [Member]

Disclosure of non-adjusting events after reporting period [line items]

Interest rate

3.50%

Maturity

2,020

Bonds purchased

$ 817,303

Subsidiary Guarantor Informa160

Subsidiary Guarantor Information - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2017
Disclosure of subsidiaries [abstract]
Percentage of owned guarantors subsidiaries	100.00%

Subsidiary Guarantor Informa161

Subsidiary Guarantor Information - Summary of Principal Amount Outstanding of Registered Debt Securities (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)
5.75% Guaranteed Notes due 2018 [member] | Master Trust [member]
Supplemental Information [Line Items]
Issuer	Petróleos Mexicanos
Guarantors	Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services
Principal amount outstanding (U.S. $)	$ 834,688
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, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services
Principal amount outstanding (U.S. $)	$ 1,750,000
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, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services
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, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services
Principal amount outstanding (U.S. $)	$ 160,245
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, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services
Principal amount outstanding (U.S. $)	$ 106,507
91/4% Guaranteed Bonds due 2018 [member] | Master Trust [member]
Supplemental Information [Line Items]
Issuer	Petróleos Mexicanos
Guarantors	Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services
Principal amount outstanding (U.S. $)	$ 107,109
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, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services
Principal amount outstanding (U.S. $)	$ 219,217
8.00% Notes due 2019 [member] | Petroleos Mexicanos [member]
Supplemental Information [Line Items]
Issuer	Petróleos Mexicanos
Guarantors	Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services
Principal amount outstanding (U.S. $)	$ 1,312,015
3.500% Notes due 2018 [member] | Petroleos Mexicanos [member]
Supplemental Information [Line Items]
Issuer	Petróleos Mexicanos
Guarantors	Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services
Principal amount outstanding (U.S. $)	$ 355,356
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, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services
Principal amount outstanding (U.S. $)	$ 102,149
Floating Rate Notes due 2018 member] | Petroleos Mexicanos [member]
Supplemental Information [Line Items]
Issuer	Petróleos Mexicanos
Guarantors	Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services
Principal amount outstanding (U.S. $)	$ 498,570
6.000% Notes due 2020 [member] | Petroleos Mexicanos [member]
Supplemental Information [Line Items]
Issuer	Petróleos Mexicanos
Guarantors	Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services
Principal amount outstanding (U.S. $)	$ 995,364
5.50% Notes due 2021 [member] | Petroleos Mexicanos [member]
Supplemental Information [Line Items]
Issuer	Petróleos Mexicanos
Guarantors	Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services
Principal amount outstanding (U.S. $)	$ 2,962,047
3.500% Notes due 2023 [member] | Petroleos Mexicanos [member]
Supplemental Information [Line Items]
Issuer	Petróleos Mexicanos
Guarantors	Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services
Principal amount outstanding (U.S. $)	$ 2,099,730
4.875% Notes due 2024 [member] | Petroleos Mexicanos [member]
Supplemental Information [Line Items]
Issuer	Petróleos Mexicanos
Guarantors	Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services
Principal amount outstanding (U.S. $)	$ 1,499,136
6.625% Notes due 2035 [member] | Petroleos Mexicanos [member]
Supplemental Information [Line Items]
Issuer	Petróleos Mexicanos
Guarantors	Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services
Principal amount outstanding (U.S. $)	$ 999,000
6.500% Bonds due 2041 [member] | Petroleos Mexicanos [member]
Supplemental Information [Line Items]
Issuer	Petróleos Mexicanos
Guarantors	Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services
Principal amount outstanding (U.S. $)	$ 3,000,000
4.875% Bonds 2022 [member] | Petroleos Mexicanos [member]
Supplemental Information [Line Items]
Issuer	Petróleos Mexicanos
Guarantors	Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services
Principal amount outstanding (U.S. $)	$ 2,097,055
3.125% Notes due 2019 [member] | Petroleos Mexicanos [member]
Supplemental Information [Line Items]
Issuer	Petróleos Mexicanos
Guarantors	Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services
Principal amount outstanding (U.S. $)	$ 325,778
3.500% Notes due 2020 [member] | Petroleos Mexicanos [member]
Supplemental Information [Line Items]
Issuer	Petróleos Mexicanos
Guarantors	Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services
Principal amount outstanding (U.S. $)	$ 1,465,367
5.50% Bonds due 2044 [member] | Petroleos Mexicanos [member]
Supplemental Information [Line Items]
Issuer	Petróleos Mexicanos
Guarantors	Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services
Principal amount outstanding (U.S. $)	$ 2,657,962
6.375% Bonds due en 2045 [member] | Petroleos Mexicanos [member]
Supplemental Information [Line Items]
Issuer	Petróleos Mexicanos
Guarantors	Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services
Principal amount outstanding (U.S. $)	$ 2,999,980
5.625% Bonds due 2046 [member] | Petroleos Mexicanos [member]
Supplemental Information [Line Items]
Issuer	Petróleos Mexicanos
Guarantors	Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services
Principal amount outstanding (U.S. $)	$ 2,996,226
4.500% Notes due 2026 member] | Petroleos Mexicanos [member]
Supplemental Information [Line Items]
Issuer	Petróleos Mexicanos
Guarantors	Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services
Principal amount outstanding (U.S. $)	$ 1,489,718
4.250% Notes due 2025 [member] | Petroleos Mexicanos [member]
Supplemental Information [Line Items]
Issuer	Petróleos Mexicanos
Guarantors	Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services
Principal amount outstanding (U.S. $)	$ 998,435
Five point five percent guaranteed notes due two thousand nineteen [member] | Petroleos Mexicanos [member]
Supplemental Information [Line Items]
Issuer	Petróleos Mexicanos
Guarantors	Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services
Principal amount outstanding (U.S. $)	$ 740,851
Six point three seven five percent guaranteed notes due two thousand twenty one [member] | Petroleos Mexicanos [member]
Supplemental Information [Line Items]
Issuer	Petróleos Mexicanos
Guarantors	Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services
Principal amount outstanding (U.S. $)	$ 1,247,668
Six point eight seven five percent guaranteed notes due two thousand twenty six [member] | Petroleos Mexicanos [member]
Supplemental Information [Line Items]
Issuer	Petróleos Mexicanos
Guarantors	Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services
Principal amount outstanding (U.S. $)	$ 2,970,334
Four point six two five percent guaranteed notes due two thousand twenty three [member] | Petroleos Mexicanos [member]
Supplemental Information [Line Items]
Issuer	Petróleos Mexicanos
Guarantors	Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services
Principal amount outstanding (U.S. $)	$ 2,055,498
Six point seven five percent guaranteed notes due two thousand forty seven [member] | Petroleos Mexicanos [member]
Supplemental Information [Line Items]
Issuer	Petróleos Mexicanos
Guarantors	Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services
Principal amount outstanding (U.S. $)	$ 3,671,628
9.250% global guaranteed bonds due 2028 [member] | Petroleos Mexicanos [member]
Supplemental Information [Line Items]
Issuer	Petróleos Mexicanos
Guarantors	Pemex Exploration and Production, Pemex Industrial Transformation, Pemex Drilling and Services, Pemex Logistics and Pemex Cogeneration and Services
Principal amount outstanding (U.S. $)	$ 9,296

Subsidiary Guarantor Informa162

Subsidiary Guarantor Information - Supplemental Statement of Financial Position (Detail) $ in Thousands, $ in Thousands	Dec. 31, 2017USD ($)	Dec. 31, 2017MXN ($)	Dec. 31, 2016USD ($)	Dec. 31, 2016MXN ($)	Dec. 31, 2015MXN ($)	Dec. 31, 2014MXN ($)
Current assets
Cash and cash equivalents	$ 4,945,330	$ 97,851,754	$ 8,264,769	$ 163,532,513	$ 109,368,880	$ 117,988,528
Accounts receivable and other, net, and derivative financial instruments		200,758,688		138,077,997
Inventories	3,227,366	63,858,930		45,892,060
Available-for-sale financial assets	53,416	1,056,918		2,852,679
Held-for-sale non-financial assets		1,056,918		7,460,674
Total current assets	18,372,255	363,526,290		357,815,923	267,200,497
Available-for-sale financial assets				6,027,540
Investments in joint ventures and associates	844,373	16,707,364		20,737,509	24,165,599
Wells, pipelines, properties, plant and equipment-net	72,599,743	1,436,509,326		1,667,742,248	1,344,483,631
Long-term notes receivables	7,504,683	148,492,909		148,607,602
Deferred taxes	7,388,422	146,192,485		100,324,689
Restricted cash				10,478,626
Intangible assets	459,327	9,088,563		8,639,242
Other assets	580,449	11,485,177		9,512,645
Total assets	107,749,252	2,132,002,114		2,329,886,024	1,775,654,200
Current liabilities
Current portion of long-term debt	7,945,209	157,209,467		176,166,188
Other current liabilities		231,917,718		250,023,698
Total current liabilities	19,666,099	389,127,185		426,189,886	443,407,721
Long-term debt	95,046,956	1,880,665,604		1,807,004,542	1,300,873,167
Employee benefits, provisions for sundry creditors, other liabilities and deferred taxes		1,364,561,710		1,329,699,743
Total liabilities	183,676,636	3,634,354,499		3,562,894,171	3,107,330,098
Long-term debt	95,046,956	1,880,665,604		1,807,004,542	1,300,873,167
Employee benefits, provisions for sundry creditors, other liabilities and deferred taxes		1,364,561,710		1,329,699,743
Total liabilities	183,676,636	3,634,354,499		3,562,894,171	3,107,330,098
Equity (deficit), net	(75,927,384)	(1,502,352,385)		(1,233,008,147)	(1,331,675,898)	(767,720,854)
Total liabilities and equity	$ 107,749,252	2,132,002,114		2,329,886,024
Petroleos Mexicanos [member]
Current assets
Cash and cash equivalents		46,959,103		92,503,607	58,461,014	73,002,640
Accounts receivable and other, net, and derivative financial instruments		83,119,394		6,604,595
Accounts receivable-inter-company		311,148,593		440,645,367
Inventories		509,375		446,954
Total current assets		441,736,465		540,200,523
Long-term receivables-intercompany		1,823,276,758		1,740,519,399
Investments in joint ventures and associates		(465,832,399)		(250,108,630)
Wells, pipelines, properties, plant and equipment-net		12,444,376		12,596,722
Long-term notes receivables		147,286,367		140,579,974
Deferred taxes		59,691,528		59,162,878
Other assets		2,209,579		1,824,104
Total assets		2,020,812,674		2,244,774,970
Current liabilities
Current portion of long-term debt		137,947,110		157,937,631
Accounts payable-inter-company		1,240,490,891		1,265,244,986
Other current liabilities		23,435,614		34,913,773
Total current liabilities		1,401,873,615		1,458,096,390
Long-term debt		1,824,829,579		1,737,332,174
Employee benefits, provisions for sundry creditors, other liabilities and deferred taxes		297,028,436		282,902,667
Total liabilities		3,523,731,630		3,478,331,231
Long-term debt		1,824,829,579		1,737,332,174
Employee benefits, provisions for sundry creditors, other liabilities and deferred taxes		297,028,436		282,902,667
Total liabilities		3,523,731,630		3,478,331,231
Equity (deficit), net		(1,502,918,956)		(1,233,556,261)
Total liabilities and equity		2,020,812,674		2,244,774,970
Subsidiary guarantors [member]
Current assets
Cash and cash equivalents		18,815,345		9,732,503	6,630,674	5,407,420
Accounts receivable and other, net, and derivative financial instruments		38,105,354		75,760,079
Accounts receivable-inter-company		1,380,100,592		1,684,782,235
Inventories		32,357,125		29,270,943
Held-for-sale non-financial assets				7,460,674
Total current assets		1,469,378,416		1,807,006,434
Long-term receivables-intercompany		285		289
Investments in joint ventures and associates		82,668		396,681
Wells, pipelines, properties, plant and equipment-net		1,370,974,060		1,595,655,580
Long-term notes receivables		1,206,542		8,027,628
Deferred taxes		84,443,897		40,341,615
Restricted cash				9,624,804
Intangible assets		9,088,563		8,639,242
Other assets		4,846,078		2,707,788
Total assets		2,940,020,509		3,472,400,061
Current liabilities
Current portion of long-term debt		5,386,564		7,381,095
Accounts payable-inter-company		434,556,688		854,106,939
Other current liabilities		157,589,107		169,182,239
Total current liabilities		597,532,359		1,030,670,273
Long-term debt		40,262,391		46,090,919
Long-term payables-inter-company		1,830,150,615		1,746,433,870
Employee benefits, provisions for sundry creditors, other liabilities and deferred taxes		1,057,191,286		1,035,019,339
Total liabilities		3,525,136,651		3,858,214,401
Long-term debt		40,262,391		46,090,919
Long-term payables-inter-company		1,830,150,615		1,746,433,870
Employee benefits, provisions for sundry creditors, other liabilities and deferred taxes		1,057,191,286		1,035,019,339
Total liabilities		3,525,136,651		3,858,214,401
Equity (deficit), net		(585,116,142)		(385,814,340)
Total liabilities and equity		2,940,020,509		3,472,400,061
Non-guarantor subsidiaries [member]
Current assets
Cash and cash equivalents		32,077,306		61,296,403	$ 44,277,192	$ 39,578,468
Accounts receivable and other, net, and derivative financial instruments		79,533,940		55,713,323
Accounts receivable-inter-company		86,354,837		70,268,246
Inventories		30,992,430		16,174,163
Available-for-sale financial assets		1,056,918		2,852,679
Total current assets		230,015,431		206,304,814
Available-for-sale financial assets				6,027,540
Long-term receivables-intercompany		3,597,880		6,384,944
Investments in joint ventures and associates		16,611,681		20,327,813
Wells, pipelines, properties, plant and equipment-net		53,090,890		59,489,946
Deferred taxes		2,057,060		820,196
Restricted cash				853,822
Other assets		4,429,520		4,980,753
Total assets		309,802,462		305,189,828
Current liabilities
Current portion of long-term debt		13,875,793		10,847,462
Accounts payable-inter-company		93,140,905		68,510,835
Other current liabilities		50,892,997		45,927,686
Total current liabilities		157,909,695		125,285,983
Long-term debt		15,573,634		23,581,449
Long-term payables-inter-company		6,139,845		8,303,850
Employee benefits, provisions for sundry creditors, other liabilities and deferred taxes		10,341,988		11,777,737
Total liabilities		189,965,162		168,949,019
Long-term debt		15,573,634		23,581,449
Long-term payables-inter-company		6,139,845		8,303,850
Employee benefits, provisions for sundry creditors, other liabilities and deferred taxes		10,341,988		11,777,737
Total liabilities		189,965,162		168,949,019
Equity (deficit), net		119,837,300		136,240,809
Total liabilities and equity		309,802,462		305,189,828
Intersegment Eliminations [member]
Current assets
Accounts receivable-inter-company		(1,777,604,022)		(2,195,695,848)
Total current assets		(1,777,604,022)		(2,195,695,848)
Long-term receivables-intercompany		(1,826,874,923)		(1,746,904,632)
Investments in joint ventures and associates		465,845,414		250,121,645
Total assets		(3,138,633,531)		(3,692,478,835)
Current liabilities
Accounts payable-inter-company		(1,768,188,484)		(2,187,862,760)
Total current liabilities		(1,768,188,484)		(2,187,862,760)
Long-term payables-inter-company		(1,836,290,460)		(1,754,737,720)
Total liabilities		(3,604,478,944)		(3,942,600,480)
Long-term payables-inter-company		(1,836,290,460)		(1,754,737,720)
Total liabilities		(3,604,478,944)		(3,942,600,480)
Equity (deficit), net		465,845,413		250,121,645
Total liabilities and equity		$ (3,138,633,531)		$ (3,692,478,835)

Subsidiary Guarantor Informa163

Subsidiary Guarantor Information - Supplemental Statement of Comprehensive Income (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)	Dec. 31, 2017MXN ($)	Dec. 31, 2016MXN ($)	Dec. 31, 2015MXN ($)
Supplemental Information [Line Items]
Net sales		$ 1,385,899,150	$ 1,065,118,590	$ 1,153,450,357
Services income	$ 562,528	11,130,569	8,974,642	8,310,035
Total of sales	70,604,483	1,397,029,719	1,074,093,232	1,161,760,392
Impairment (reversal) of wells, pipelines, properties, plant and equipment	7,653,856	151,444,560	(331,314,343)	477,944,690
Benefit from change in pension plan				(92,177,089)
Cost of sales	50,751,509	1,004,204,880	865,822,221	891,964,606
Gross income	12,199,118	241,380,279	539,585,354	(115,971,815)
Other (expenses) revenues, net	261,493	5,174,076	22,649,606	(875,487)
General expenses:
Transportation, distribution and sale expenses	1,106,282	21,889,670	25,231,240	28,928,639
Administrative expenses	6,061,620	119,939,454	112,653,533	112,472,095
Benefit from change in pension plan				(103,860,955)
Total general expenses		141,829,124	137,884,773	37,539,779
Transportation, distribution and sale expenses	1,106,282	21,889,670	25,231,240	28,928,639
Administrative expenses	6,061,620	119,939,454	112,653,533	112,472,095
Total general expenses		141,829,124	137,884,773	37,539,779
Operating income	5,292,708	104,725,231	424,350,187	(154,387,081)
Financing income	817,006	16,165,853	13,749,255	14,990,859
Financing cost	5,945,638	117,644,548	98,844,464	67,773,593
Derivative financial instruments (cost) income, net		25,338,324	(14,000,987)	(21,449,877)
Foreign exchange income (loss), net	1,171,702	23,184,122	(254,012,743)	(154,765,574)
(Loss) profit sharing in joint ventures and associates	18,216	360,440	2,135,845	2,318,115
Income (loss) before taxes, duties and other	2,634,569	52,129,422	73,377,093	(381,067,151)
Total taxes, duties and other	16,828,478	332,980,041	264,521,435	331,500,247
Net (loss) income for the year	(14,193,909)	(280,850,619)	(191,144,342)	(712,567,398)
Total other comprehensive result	581,521	11,506,381	127,872,481	88,612,354
Total comprehensive result for the year	$ (13,612,388)	(269,344,238)	(63,271,861)	(623,955,044)
Petroleos Mexicanos [member]
Supplemental Information [Line Items]
Net sales				15,556
Services income		50,399,983	46,330,245	16,897,139
Total of sales		50,399,983	46,330,245	16,912,695
Cost of sales		2,007,814	1,236,921	2,695,423
Gross income		48,392,169	45,093,324	14,217,272
Other (expenses) revenues, net		(341,521)	(312,611)	(19,805)
General expenses:
Administrative expenses		59,141,391	57,437,455	59,923,878
Benefit from change in pension plan				(46,031,780)
Total general expenses		59,141,391	57,437,455	13,892,098
Administrative expenses		59,141,391	57,437,455	59,923,878
Total general expenses		59,141,391	57,437,455	13,892,098
Operating income		(11,090,743)	(12,656,742)	305,369
Financing income		143,676,367	123,266,281	108,543,665
Financing cost		(236,929,035)	160,824,632	85,544,060
Derivative financial instruments (cost) income, net		27,670,991	(12,052,200)	(22,803,663)
Foreign exchange income (loss), net		6,837,171	(20,531,005)	(14,829,436)
(Loss) profit sharing in joint ventures and associates		(211,567,169)	(117,347,803)	(749,963,960)
Income (loss) before taxes, duties and other		(281,402,418)	(200,146,101)	(764,292,085)
Total taxes, duties and other		(557,520)	(8,834,626)	(51,982,560)
Net (loss) income for the year		(280,844,898)	(191,311,475)	(712,309,525)
Total other comprehensive result		4,728,640	10,126,560	10,980,787
Total comprehensive result for the year		(276,116,258)	(181,184,915)	(701,328,738)
Subsidiary guarantors [member]
Supplemental Information [Line Items]
Net sales		1,713,914,703	1,361,538,624	1,523,767,800
Services income		140,934,022	98,959,131	16,815,589
Total of sales		1,854,848,725	1,460,497,755	1,540,583,389
Impairment (reversal) of wells, pipelines, properties, plant and equipment		145,302,407	(330,037,834)	476,276,159
Benefit from change in pension plan				(83,657,496)
Cost of sales		1,447,640,131	1,244,388,072	1,280,404,059
Gross income		261,906,187	546,147,517	(132,439,333)
Other (expenses) revenues, net		(12,443,660)	20,713,184	(6,073,003)
General expenses:
Transportation, distribution and sale expenses		26,136,674	50,948,771	32,870,908
Administrative expenses		105,920,390	96,884,031	52,832,029
Benefit from change in pension plan				(50,394,477)
Total general expenses		132,057,064	147,832,802	35,308,460
Transportation, distribution and sale expenses		26,136,674	50,948,771	32,870,908
Administrative expenses		105,920,390	96,884,031	52,832,029
Total general expenses		132,057,064	147,832,802	35,308,460
Operating income		117,405,463	419,027,899	(173,820,796)
Financing income		134,401,598	67,542,768	28,639,034
Financing cost		(141,900,236)	114,271,762	104,453,148
Derivative financial instruments (cost) income, net		(1,608,039)	3,172	6,463
Foreign exchange income (loss), net		15,807,988	(232,714,446)	(139,623,910)
(Loss) profit sharing in joint ventures and associates		409,955	628,357	198,786
Income (loss) before taxes, duties and other		124,516,729	140,215,988	(389,053,571)
Total taxes, duties and other		331,001,261	266,155,181	376,649,369
Net (loss) income for the year		(206,484,532)	(125,939,193)	(765,702,940)
Total other comprehensive result		6,841,586	96,032,433	56,585,790
Total comprehensive result for the year		(199,642,946)	(29,906,760)	(709,117,150)
Non-guarantor subsidiaries [member]
Supplemental Information [Line Items]
Net sales		1,096,752,930	828,143,332	803,623,324
Services income		2,646,144	1,970,055	2,585,617
Total of sales		1,099,399,074	830,113,387	806,208,941
Impairment (reversal) of wells, pipelines, properties, plant and equipment		6,142,153	(1,276,509)	1,668,531
Benefit from change in pension plan				(8,519,593)
Cost of sales		1,083,297,610	809,156,778	791,147,745
Gross income		9,959,311	22,233,118	21,912,258
Other (expenses) revenues, net		(4,664,096)	2,915,837	3,326,421
General expenses:
Transportation, distribution and sale expenses		1,297,558	945,489	2,921,430
Administrative expenses		5,883,200	7,050,271	10,638,127
Benefit from change in pension plan				(7,434,698)
Total general expenses		7,180,758	7,995,760	6,124,859
Transportation, distribution and sale expenses		1,297,558	945,489	2,921,430
Administrative expenses		5,883,200	7,050,271	10,638,127
Total general expenses		7,180,758	7,995,760	6,124,859
Operating income		(1,885,543)	17,153,195	19,113,820
Financing income		3,185,195	3,526,378	3,478,434
Financing cost		(3,616,530)	3,602,868	3,306,776
Derivative financial instruments (cost) income, net		(724,628)	(1,951,959)	1,347,323
Foreign exchange income (loss), net		538,963	(767,292)	(312,228)
(Loss) profit sharing in joint ventures and associates		(49,515)	1,507,488	2,119,329
Income (loss) before taxes, duties and other		(2,552,058)	15,864,942	22,439,902
Total taxes, duties and other		2,536,300	7,200,880	6,833,438
Net (loss) income for the year		(5,088,358)	8,664,062	15,606,464
Total other comprehensive result		(63,845)	21,713,488	21,045,777
Total comprehensive result for the year		(5,152,203)	30,377,550	36,652,241
Intersegment Eliminations [member]
Supplemental Information [Line Items]
Net sales		(1,424,768,483)	(1,124,563,366)	(1,173,956,323)
Services income		(182,849,580)	(138,284,789)	(27,988,310)
Total of sales		(1,607,618,063)	(1,262,848,155)	(1,201,944,633)
Cost of sales		(1,528,740,675)	(1,188,959,550)	(1,182,282,621)
Gross income		(78,877,388)	(73,888,605)	(19,662,012)
Other (expenses) revenues, net		22,623,353	(666,804)	1,890,900
General expenses:
Transportation, distribution and sale expenses		(5,544,562)	(26,663,020)	(6,863,699)
Administrative expenses		(51,005,527)	(48,718,224)	(10,921,939)
Total general expenses		(56,550,089)	(75,381,244)	(17,785,638)
Transportation, distribution and sale expenses		(5,544,562)	(26,663,020)	(6,863,699)
Administrative expenses		(51,005,527)	(48,718,224)	(10,921,939)
Total general expenses		(56,550,089)	(75,381,244)	(17,785,638)
Operating income		296,054	825,835	14,526
Financing income		(265,097,307)	(180,586,172)	(125,670,274)
Financing cost		264,801,253	(179,854,798)	(125,530,391)
(Loss) profit sharing in joint ventures and associates		211,567,169	117,347,803	749,963,960
Income (loss) before taxes, duties and other		211,567,169	117,442,264	749,838,603
Net (loss) income for the year		211,567,169	117,442,264	749,838,603
Total comprehensive result for the year		$ 211,567,169	$ 117,442,264	$ 749,838,603

Subsidiary Guarantor Informa164

Subsidiary Guarantor Information - Supplemental Statement of Cash Flows (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)	Dec. 31, 2017MXN ($)	Dec. 31, 2016MXN ($)	Dec. 31, 2015MXN ($)
Operating activities:
Net (loss) income for the year		$ (280,850,619)	$ (191,144,342)	$ (712,567,398)
Adjustments to reconcile net loss to cash provided by operating activities:
Depreciation and amortization	$ 7,919,689	156,704,513	150,439,491	167,951,250
(Reversal) impairment of wells, pipelines, properties, plant and equipment	7,653,856	151,444,560	(331,314,343)	477,944,690
Unsuccessful wells	311,554	6,164,624	29,106,084	23,213,519
Exploration costs		(1,447,761)	(2,022,826)	(5,698,511)
Disposal of wells, pipelines, properties, plant and equipment	862,381	17,063,671	3,771,287	24,638,537
Loss in sale of fixed assets			27,882,480
Gain on sale of share in joint ventures and associates	(158,647)	(3,139,103)	(15,211,039)	(680,630)
Profit (loss) sharing in joint ventures and associates			(2,135,845)	(2,318,115)
Disposal of held-for-sale current non-financial assets		2,808,360
Impairment of goodwill			4,007,018
Dividends	(9,131)	(180,675)	(293,397)	(359,941)
Effects of net present value of reserve for well abandonment	392,890	7,774,000	11,968,966	(608,160)
Profit (loss) sharing in investments		(360,440)
Decrease on available-for-sale financial assets	68,743	1,360,205
Net loss on available-for-sale financial assets	178,087	3,523,748
Unrealized foreign exchange loss (gain)	(843,265)	(16,685,439)	243,182,764	152,676,256
Interest expense	5,945,638	117,644,548	98,844,464	67,773,593
Accounts receivable, accounts payable and derivative financial instruments		(123,501,225)	(89,784,505)	33,429,565
Inventories	(908,028)	(17,966,870)	(1,358,879)	6,167,728
Other assets		(7,024,023)	(25,128,530)	(16,602,365)
Employee benefits	2,530,255	50,065,396	47,293,069	(116,022,232)
Net cash flows from (used in) operating activities	3,204,044	63,397,470	(41,898,083)	98,937,786
Acquisition of wells, pipelines, properties, plant and equipment	(4,642,485)	(91,859,465)	(151,408,480)	(253,514,001)
Investments in associates				(36,214)
Resources from sale of shares in associates	158,779	3,141,710	22,684,736	4,417,138
Cash flows used in investing activities	(4,078,038)	(80,690,919)	(132,492,848)	(249,133,077)
Resources from sale available-for-sale financial assets	405,668	8,026,836
Proceeds from the sale of fixed assets			560,665
Business acquisition			(4,329,769)
Financing activities:
Increase in equity due to Certificates of Contributions "A"			73,500,000	10,000,000
Loans obtained from financial institutions	35,615,614	704,715,468	841,991,767	378,971,078
Debt payments, principal only	(32,342,434)	(642,059,819)	(614,987,329)	(193,618,498)
Interest paid	(5,504,223)	(108,910,417)	(88,754,141)	(62,737,150)
Cash flows provided by financing activities:	(2,231,043)	(46,254,768)	211,750,297	132,615,430
Cash flows provided by financing activities:	(2,231,043)	(46,254,768)	211,750,297	132,615,430
Net (decrease) increase in cash and cash equivalents	(3,211,663)	(63,548,217)	37,359,366	(17,579,861)
Effects of change in cash value	(107,776)	(2,132,542)	16,804,267	8,960,213
Cash and cash equivalents at the beginning of the year	8,264,769	163,532,513	109,368,880	117,988,528
Cash and cash equivalents at the end of the year	$ 4,945,330	97,851,754	163,532,513	109,368,880
Petroleos Mexicanos [member]
Operating activities:
Net (loss) income for the year		(280,844,898)	(191,311,476)	(712,177,124)
Adjustments to reconcile net loss to cash provided by operating activities:
Depreciation and amortization		1,155,881	1,066,033	789,657
Disposal of wells, pipelines, properties, plant and equipment		433,391	320,599	180,992
Profit (loss) sharing in joint ventures and associates			117,249,643	749,963,958
Profit (loss) sharing in investments		211,567,169
Unrealized foreign exchange loss (gain)		(13,526,153)	231,191,646	145,971,158
Interest expense		100,545,114	91,044,541	63,460,443
Accounts receivable, accounts payable and derivative financial instruments		(88,496,967)	23,636,331	(58,554,144)
Inventories		(62,421)	83,317	108,568
Other assets		(7,091,867)	(2,405,412)	(149,819)
Employee benefits		18,829,768	2,591,000	(10,037,444)
Inter-company charges and deductions		7,284,124	(393,835,932)	(310,384,820)
Net cash flows from (used in) operating activities		(50,206,859)	(120,369,710)	(130,828,575)
Acquisition of wells, pipelines, properties, plant and equipment		(1,436,926)	(2,172,586)	(1,496,277)
(Increase) decrease due to Inter-company investing		25,611,359	(39,612,699)	(39,108,879)
Cash flows used in investing activities		24,174,433	(41,785,285)	(40,605,156)
Financing activities:
Increase in equity due to Certificates of Contributions "A"			73,500,000	10,000,000
Loans obtained from financial institutions		401,947,349	571,944,209	345,383,990
Debt payments, principal only		(327,703,729)	(372,809,166)	(147,927,857)
Interest paid		(93,755,698)	(82,008,347)	(58,123,368)
Inter-company increase (decrease) financing				(3,626,448)
Cash flows provided by financing activities:		(19,512,078)	190,626,696	145,706,317
Cash flows provided by financing activities:		(19,512,078)	190,626,696	145,706,317
Net (decrease) increase in cash and cash equivalents		(45,544,504)	28,471,701	(25,727,414)
Effects of change in cash value			5,570,892	11,185,788
Cash and cash equivalents at the beginning of the year		92,503,607	58,461,014	73,002,640
Cash and cash equivalents at the end of the year		46,959,103	92,503,607	58,461,014
Subsidiary guarantors [member]
Operating activities:
Net (loss) income for the year		(206,484,532)	(139,410,398)	(765,702,826)
Adjustments to reconcile net loss to cash provided by operating activities:
Depreciation and amortization		152,607,943	146,545,307	164,221,429
(Reversal) impairment of wells, pipelines, properties, plant and equipment		145,302,407	(330,037,834)	476,276,159
Unsuccessful wells		6,164,624	29,106,084	23,213,519
Exploration costs		(1,447,761)	(2,022,826)	(5,698,511)
Disposal of wells, pipelines, properties, plant and equipment		14,687,229	2,658,625	21,945,266
Loss in sale of fixed assets			27,882,480
Gain on sale of share in joint ventures and associates		(3,139,103)	(15,211,039)	(337,675)
Profit (loss) sharing in joint ventures and associates			(628,356)	(198,786)
Disposal of held-for-sale current non-financial assets		2,808,360
Effects of net present value of reserve for well abandonment		7,774,000	11,968,966	(608,160)
Profit (loss) sharing in investments		(409,955)
Unrealized foreign exchange loss (gain)		(1,585,910)	6,754,046	2,996,219
Interest expense		15,736,420	5,687,502	3,414,430
Accounts receivable, accounts payable and derivative financial instruments		(14,214,566)	(158,449,370)	119,761,648
Inventories		(3,086,181)	3,508,494	4,547,843
Other assets		(483,389)	(22,600,504)	(16,578,827)
Employee benefits		31,489,785	136,354,337	(94,183,192)
Inter-company charges and deductions		(114,968,213)	(83,049,125)	30,044,041
Net cash flows from (used in) operating activities		30,751,158	(380,943,611)	(36,887,423)
Acquisition of wells, pipelines, properties, plant and equipment		(87,274,561)	(147,786,686)	(239,315,507)
Resources from sale of shares in associates		3,863,072	23,050,344	(130,323)
Cash flows used in investing activities		(83,411,489)	(124,175,677)	(239,445,830)
Proceeds from the sale of fixed assets			560,665
Financing activities:
Increase in equity due to Certificates of Contributions "A"				(1,915,922)
Loans obtained from financial institutions			34,483,348
Debt payments, principal only		(7,981,937)	(6,414,441)	(8,081,177)
Interest paid		(13,991,633)	(4,706,946)	(3,443,923)
Inter-company increase (decrease) financing		83,716,743	464,488,030	289,859,173
Cash flows provided by financing activities:		61,743,173	487,849,991	276,418,151
Cash flows provided by financing activities:		61,743,173	487,849,991	276,418,151
Net (decrease) increase in cash and cash equivalents		9,082,842	(17,269,297)	84,898
Effects of change in cash value			20,371,126	1,138,356
Cash and cash equivalents at the beginning of the year		9,732,503	6,630,674	5,407,420
Cash and cash equivalents at the end of the year		18,815,345	9,732,503	6,630,674
Non-guarantor subsidiaries [member]
Operating activities:
Net (loss) income for the year		(5,082,639)	22,160,755	15,738,868
Adjustments to reconcile net loss to cash provided by operating activities:
Depreciation and amortization		2,940,689	2,828,151	2,940,164
(Reversal) impairment of wells, pipelines, properties, plant and equipment		6,142,153	(1,276,509)	1,668,531
Disposal of wells, pipelines, properties, plant and equipment		1,943,051	792,063	2,512,279
Gain on sale of share in joint ventures and associates				(342,955)
Profit (loss) sharing in joint ventures and associates			(1,507,489)	(2,119,329)
Impairment of goodwill			4,007,018
Dividends		(180,675)	(293,397)	(359,941)
Profit (loss) sharing in investments		49,515
Decrease on available-for-sale financial assets		1,360,205
Net loss on available-for-sale financial assets		3,523,748
Unrealized foreign exchange loss (gain)		(1,573,376)	5,237,072	3,708,879
Interest expense		1,363,014	2,112,421	898,720
Accounts receivable, accounts payable and derivative financial instruments		(20,789,692)	45,028,534	(27,777,939)
Inventories		(14,818,268)	(4,950,690)	1,511,317
Other assets		551,233	(122,614)	126,281
Employee benefits		(254,157)	(91,652,268)	(11,801,596)
Inter-company charges and deductions		514,270	48,435,633	31,975,215
Net cash flows from (used in) operating activities		(24,310,929)	30,798,680	18,678,494
Acquisition of wells, pipelines, properties, plant and equipment		(3,147,978)	(1,449,208)	(12,702,217)
Investments in associates				(36,214)
Resources from sale of shares in associates		(721,362)	(365,608)	4,547,461
Cash flows used in investing activities		4,157,496	(6,144,585)	(8,190,970)
Resources from sale available-for-sale financial assets		8,026,836
Business acquisition			(4,329,769)
Financing activities:
Increase in equity due to Certificates of Contributions "A"				1,844,394
Loans obtained from financial institutions		302,768,119	235,564,210	33,587,088
Debt payments, principal only		(306,374,153)	(235,763,722)	(37,609,464)
Interest paid		(1,163,086)	(2,038,848)	(1,169,859)
Inter-company increase (decrease) financing		(2,164,002)	3,741,227	922,972
Cash flows provided by financing activities:		(6,933,122)	1,502,867	(2,424,869)
Cash flows provided by financing activities:		(6,933,122)	1,502,867	(2,424,869)
Net (decrease) increase in cash and cash equivalents		(27,086,555)	26,156,962	8,062,655
Effects of change in cash value		(2,132,542)	(9,137,751)	(3,363,931)
Cash and cash equivalents at the beginning of the year		61,296,403	44,277,192	39,578,468
Cash and cash equivalents at the end of the year		32,077,306	61,296,403	44,277,192
Intersegment Eliminations [member]
Operating activities:
Net (loss) income for the year		211,561,450	117,416,777	749,573,684
Adjustments to reconcile net loss to cash provided by operating activities:
Profit (loss) sharing in joint ventures and associates			(117,249,643)	(749,963,958)
Profit (loss) sharing in investments		(211,567,169)
Inter-company charges and deductions		107,169,819	428,449,424	248,365,564
Net cash flows from (used in) operating activities		107,164,100	428,616,558	247,975,290
(Increase) decrease due to Inter-company investing		(25,611,359)	39,612,699	39,108,879
Cash flows used in investing activities		(25,611,359)	39,612,699	39,108,879
Financing activities:
Increase in equity due to Certificates of Contributions "A"				71,528
Inter-company increase (decrease) financing		(81,552,741)	(468,229,257)	(287,155,697)
Cash flows provided by financing activities:		(81,552,741)	(468,229,257)	(287,084,169)
Cash flows provided by financing activities:		$ (81,552,741)	$ (468,229,257)	$ (287,084,169)

Supplementary Information on165

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, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure Of Oil And Gas Producing Activities [Line Items]
Net capitalized costs	$ 953,755,253	$ 1,181,853,614	$ 966,986,487
Proved reserves [member]
Disclosure Of Oil And Gas Producing Activities [Line Items]
Net capitalized costs	2,363,336,481	2,476,535,503	2,102,971,025
Construction in progress [member]
Disclosure Of Oil And Gas Producing Activities [Line Items]
Net capitalized costs	35,381,089	60,720,261	88,706,330
Accumulated depreciation and amortization [member]
Disclosure Of Oil And Gas Producing Activities [Line Items]
Net capitalized costs	$ (1,444,962,317)	$ (1,355,402,150)	$ (1,224,690,867)

Supplementary Information on166

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, 2017	Dec. 31, 2016
Disclosure Of Oil And Gas Producing Activities [Line Items]
Total costs incurred	$ 85,941,165	$ 155,556,912
Exploration [member]
Disclosure Of Oil And Gas Producing Activities [Line Items]
Total costs incurred	32,480,801	41,661,666
Development [member]
Disclosure Of Oil And Gas Producing Activities [Line Items]
Total costs incurred	$ 53,460,364	$ 113,895,246

Supplementary Information on167

Supplementary Information on Oil and Gas Exploration and Production Activities (Unaudited) - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2017MXN ($)BcfMMBbls	Dec. 31, 2016MXN ($)BcfMMBbls	Dec. 31, 2015
Disclosure of detailed information about property, plant and equipment [abstract]
Property acquisition costs | $	$ 0
Exploration costs for geological and geophysical studies | $	$ 8,828,809	$ 6,804,341
Estimated reserves percentage	97.00%
Remaining estimated reserve percentage	3.00%
Percenatge of developed and undeveloped reserves	11.00%
Developed and undeveloped reserves increase decrease	6,427	7,219
Percenatge of developed reserves	14.70%
Developed reserves increase decrease	4,166	4,866
Percentage of asset assigned developed and undeveloped reserves increase decrease	64.00%
Developed and undeveloped reserves added to offset	805.5
Percenatge of developed and undeveloped dry gas reserves	5.60%
Developed and undeveloped dry gas reserves increase decrease | Bcf	6,593	6,984
Percenatge of developed dry gas reserves	10.80%
Developed dry gas reserves increase decrease | Bcf	4,026	4,513
Percentage of asset assigned developed and undeveloped dry gas reserves increase decrease	64.00%
Developed and undeveloped dry gas reserves added to offset | Bcf	999
Percenatge of undeveloped dry gas reserves	3.90%
Undeveloped dry gas reserves increase decrease | Bcf	2,567	2,471
Exploratoroy activity in shallow waters and onshore regions incorporated	246
Increase of proved reserves	174.2
Reserve-replacement ratio	4.00%
Reserves production ratio of proved reserves, period		7 years 8 months 12 days
Proved reserves after net cash flows discount factor	10.00%	10.00%	10.00%

Supplementary Information on168

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, 2017MXN ($)$ / Boe$ / bbl$ / Mcf	Dec. 31, 2016MXN ($)$ / Boe$ / bbl$ / Mcf	Dec. 31, 2015MXN ($)$ / Boe$ / bbl$ / Mcf
Disclosure of detailed information about property, plant and equipment [line items]
Revenues from sale of oil and gas	$ 762,637,362	$ 616,380,608	$ 690,591,455
Hydrocarbon duties	375,156,405	304,299,019	376,682,705
Production costs (excluding taxes)	248,957,950	171,194,337	177,774,082
Other costs and expenses	(3,954,222)	61,359,271	20,360,540
Exploration expenses	14,993,433	39,693,273	31,244,564
Depreciation, depletion, amortization and accretion	240,672,906	(150,891,739)	527,014,056
Total production costs	875,826,472	425,654,161	1,133,075,947
Results of operations for oil and gas producing activities	$ (113,189,111)	$ 190,726,447	$ (442,484,491)
Oil Equivalent [member]
Disclosure of detailed information about property, plant and equipment [line items]
Average sales price | $ / Boe	38.63	29.18	37.17
Crude oil [member]
Disclosure of detailed information about property, plant and equipment [line items]
Average sales price | $ / bbl	48.71	36.55	48.22
Natural Gas [member]
Disclosure of detailed information about property, plant and equipment [line items]
Average sales price | $ / Mcf	4.32	3.01	3.78

Supplementary Information on169

Supplementary Information on Oil and Gas Exploration and Production Activities (Unaudited) - Summary of Oil and Gas Proved Reserves (Detail)	12 Months Ended
	Dec. 31, 2017BcfMMBbls	Dec. 31, 2016BcfMMBbls	Dec. 31, 2015BcfMBbls
Crude oil reserve [member]
Proved developed and un-developed reserves:
Proved developed reserves	4,166	4,886	5,725
Proved undeveloped reserves	2,261	2,333	2,252
Total proved reserves | MMBbls	6,427
Dry gas reserve [member]
Proved developed and un-developed reserves:
Proved developed reserves	4,026	4,513	6,012
Proved undeveloped reserves	2,567	2,471	2,598
Total proved reserves	6,593

Supplementary Information on170

Supplementary Information on Oil and Gas Exploration and Production Activities (Unaudited) - Disclosure of Proved Developed and Undeveloped Reserve (Detail)	12 Months Ended
	Dec. 31, 2017BcfMMBbls	Dec. 31, 2016BcfMMBbls	Dec. 31, 2015BcfMBbls
Crude oil reserve [member]
Proved developed and undeveloped reserves:
Beginning balance	7,219	7,977	10,292
Revisions	(95)	189	(1,491)
Extensions and discoveries	147	(55)	111
Production	(805)	(891)	(935)
Farm outs & transfer of fields due to NHC bidding process | MMBbls	(38)
Ending Balance	6,427	7,219	7,977
Proved developed reserves at December 31	4,166	4,886	5,725
Proved undeveloped reserves at December 31	2,261	2,333	2,252
Dry gas reserve [member]
Proved developed and undeveloped reserves:
Beginning balance	6,984	8,610	10,859
Revisions	169	(183)	(955)
Extensions and discoveries	468	(308)	47
Production	(999)	(1,134)	(1,341)
Farm outs & transfer of fields due to NHC bidding process	(29)
Ending Balance	6,593	6,984	8,610
Proved developed reserves at December 31	4,026	4,513	6,012
Proved undeveloped reserves at December 31	2,567	2,471	2,598

Supplementary Information on171

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, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Future Net Cash Flows Relating To Proved Oil And Gas Reserves [Abstract]
Future cash inflows	$ 269,489	$ 228,196	$ 325,052
Future production costs (excluding profit taxes)	(114,369)	(87,942)	(99,948)
Future development costs	(26,229)	(25,515)	(32,560)
Future cash flows before tax	128,891	114,738	192,544
Future production and excess gains taxes	(129,377)	(108,960)	(167,056)
Future net cash flows	(487)	5,779	25,488
Effect of discounting net cash flows by 10%	(4,600)	(937)	(9,946)
Standardized measure of discounted future net cash flows	$ 4,113	$ 4,841	$ 15,541	$ 44,661

Supplementary Information on172

Supplementary Information on Oil and Gas Exploration and Production Activities (Unaudited) - Disclosure of Standardized Measure of Discounted Future Net Cash Flows (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Future Net Cash Flows Relating To Proved Oil And Gas Reserves [Abstract]
Proved reserves after net cash flows discount factor	10.00%	10.00%	10.00%

Supplementary Information on173

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, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of Change in Standardized Measure of Discounted Future Net Cash Flow Relating to Proved Oil and Gas Reserves [Abstract]
Sales of oil and gas produced, net of production costs	$ (25,076)	$ (19,411)	$ (28,371)
Net changes in prices and production costs	26,355	(53,278)	(327,865)
Extensions and discoveries	3,639	1,105	3,086
Development cost incurred during the year	2,699	4,124	10,172
Changes in estimated development costs	2,744	1,763	(2,171)
Reserves revisions and timing changes	(1,353)	6,366	(22,801)
Accretion of discount of pre-tax net cash flows	5,891	11,094	43,394
Net changes in production and excess gains taxes	(15,628)	37,537	295,437
Aggregate change in standardized measure of discounted future net cash flows	(728)	(10,700)	(29,119)
As of January 1	4,841	15,541	44,661
As of December 31	4,113	4,841	15,541
Change	$ (728)	$ (10,700)	$ (29,119)