Mexican Petroleum 6-K/A 14 Dec 18 2018 H1 Current report (foreign) (amended) Financial data

Document and Entity Information

Document and Entity Information	6 Months Ended
	Jun. 30, 2018
Document - Document and Entity Information [Abstract]
Document Type	6-K/A
Amendment Flag	false
Document Period End Date	Jun. 30, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	H1
Trading Symbol	CK0000932782
Entity Registrant Name	MEXICAN PETROLEUM
Entity Central Index Key	932,782
Current Fiscal Year End Date	--12-31

Unaudited Statements of Financi

Unaudited Statements of Financial Position - MXN ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 109,506,711	$ 97,851,754
Accounts receivable, net	171,537,070	170,645,234
Inventories, net	53,325,822	63,858,930
Equity instruments	1,056,918	1,056,918
Derivative financial instruments	27,141,083	30,113,454
Total current assets	362,567,604	363,526,290
Non-current assets:
Investments in joint ventures and associates	16,938,755	16,707,364
Wells, pipelines, properties, plant and equipment, net	1,430,223,825	1,436,509,326
Long-term notes receivable	149,360,776	148,492,909
Deferred taxes	148,325,641	146,192,485
Intangible assets	13,974,430	14,678,640
Other assets	11,316,562	5,895,100
Total non-current assets	1,770,139,990	1,768,475,824
Total assets	2,132,707,594	2,132,002,114
Current liabilities:
Short-term debt and current portion of long-term debt	167,102,088	157,209,467
Suppliers	109,471,364	139,955,378
Taxes and duties payable	58,183,875	51,004,960
Accounts and accrued expenses payable	21,301,759	23,211,401
Derivative financial instruments	14,958,973	17,745,979
Total current liabilities	371,018,059	389,127,185
Long-term liabilities:
Long-term debt	1,903,230,338	1,880,665,604
Employee benefits	1,287,907,942	1,258,436,122
Provisions for sundry creditors	93,983,571	87,677,423
Other liabilities	18,891,093	14,194,237
Deferred taxes	4,511,854	4,253,928
Total long-term liabilities	3,308,524,798	3,245,227,314
Total liabilities	3,679,542,857	3,634,354,499
Controlling interest:
Certificates of Contribution "A"	356,544,447	356,544,447
Mexican Government contributions	43,730,591	43,730,591
Legal reserve	1,002,130	1,002,130
Accumulated other comprehensive result	(146,489,064)	(151,887,182)
Accumulated deficit:
From prior years	(1,752,732,435)	(1,471,862,579)
Net loss for the period	(49,861,456)	(280,844,899)
Total controlling interest	(1,547,805,787)	(1,503,317,492)
Total non-controlling interest	970,524	965,107
Total equity (deficit), net	(1,546,835,263)	(1,502,352,385)
Total liabilities and equity (deficit), net	$ 2,132,707,594	$ 2,132,002,114

Unaudited Statements of Compreh

Unaudited Statements of Comprehensive Income - MXN ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Net sales:
Domestic	$ 254,251,186	$ 211,010,409	$ 492,040,219	$ 428,750,603
Export	179,669,601	107,444,946	337,242,333	234,763,658
Services income	2,253,692	3,049,272	4,287,490	5,421,106
Total of sales	436,174,479	321,504,627	833,570,042	668,935,367
(Reversal) impairment of wells, pipelines, properties, plant and equipment, net	(23,322,073)	(18,927,912)	(42,360,452)	3,401,410
Cost of sales	304,203,639	227,367,003	580,975,521	462,729,532
Gross income	155,292,913	113,065,536	294,954,973	202,804,425
Other revenues, net	3,478,841	(4,348,720)	7,724,055	11,825,353
General expenses:
Distribution, transportation and sale expenses	5,865,518	6,519,671	11,199,349	11,534,095
Administrative expenses	33,352,971	30,666,104	64,326,282	58,823,214
Reversal of Impairment on trade and other receivables	(314,549)		(125,298)
Operating income	119,867,814	71,531,041	227,278,695	144,272,469
Financing income	1,849,510	3,693,243	10,969,569	7,301,747
Financing cost	(29,804,118)	(23,718,851)	(56,972,817)	(49,612,925)
Derivative financial instruments (cost) gain, net	(20,966,630)	19,732,250	(9,292,906)	20,332,885
Foreign exchange (cost) income, net	(118,348,021)	60,572,598	2,505,317	202,662,743
Subtotal	(167,269,259)	60,279,240	(52,790,837)	180,684,450
Profit sharing in joint ventures and associates	562,949	633,427	848,136	874,954
(Loss) income before duties, taxes and other	(46,838,496)	132,443,708	175,335,994	325,831,873
Profit sharing duty, net	118,611,725	95,305,712	226,686,236	198,272,493
Income tax	(2,277,715)	4,367,539	(1,489,847)	6,853,631
Total duties, taxes and other	116,334,010	99,673,251	225,196,389	205,126,124
Net (loss) income	(163,172,506)	32,770,457	(49,860,395)	120,715,749
Items that will be reclassified subsequently to profit or loss:
Available-for-sale financial assets		62,776		1,607,739
Currency translation effect	11,936,184	1,674,187	5,402,474	(10,301,672)
Total other comprehensive results	11,936,184	1,736,963	5,402,474	(8,693,933)
Total comprehensive (loss) income	(151,236,322)	34,507,420	(44,457,921)	112,011,816
Net (loss) income attributable to:
Controlling interest	(163,162,314)	32,761,346	(49,861,456)	120,702,571
Non-controlling interest	(10,192)	19,111	1,061	13,178
Net (loss) income	(163,172,506)	32,770,457	(49,860,395)	120,715,749
Other comprehensive results attributable to:
Controlling interest	11,899,164	1,757,715	5,398,118	(8,625,750)
Non-controlling interest	37,020	(20,652)	4,356	(68,183)
Total other comprehensive results	11,936,184	1,736,963	5,402,474	(8,693,933)
Comprehensive (loss) income:
Controlling interest	(151,263,150)	34,519,061	(44,463,338)	112,076,821
Non-controlling interest	26,828	(1,641)	5,417	(55,005)
Total comprehensive (loss) income	$ (151,236,322)	$ 34,507,420	$ (44,457,921)	$ 112,011,816

Consolidated Statements of Chan

Consolidated Statements of Changes in Equity (Deficit), Net - MXN ($) $ in Thousands	Total	Certificates of Contribution "A" [member]	Mexican Government contributions [member]	Legal Reserve [member]	Accumulated other comprehensive income (loss) [member]Available-for-sale financial assets [member]	Accumulated other comprehensive income (loss) [member]Cumulative currency translation effect [member]	Accumulated other comprehensive income (loss) [member]Actuarial (losses) gains on employee benefits effect [member]	Accumulated deficit [member]	Equity attributable to owners of parent [member]	Non-controlling interests [member]
Beginning balance (From prior years [member]) at Dec. 31, 2016								$ (1,471,862,579)
Beginning balance 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)		$ (1,233,984,852)	$ 976,705
Total comprehensive (loss) income	112,011,816				1,607,739	(10,233,489)		120,702,571	112,076,821	(55,005)
Ending balance (From prior years [member]) at Jun. 30, 2017								(1,471,862,579)
Ending balance at Jun. 30, 2017	(1,120,986,331)	356,544,447	43,730,591	1,002,130	$ (3,956,391)	40,486,533	(208,555,333)	120,702,571	(1,121,908,031)	921,700
Beginning balance at Dec. 31, 2017	(1,502,352,385)
Initial effect by the adoption of IFRS 9 | From prior years [member]								(24,957)
Initial effect by the adoption of IFRS 9	(24,957)								(24,957)
Beginning balance at Dec. 31, 2017	(1,502,352,385)
Total comprehensive (loss) income	(44,457,921)					5,398,118		(49,861,456)	(44,463,338)	5,417
Ending balance (From prior years [member]) at Jun. 30, 2018								(1,752,732,435)
Ending balance at Jun. 30, 2018	(1,546,835,263)	356,544,447	43,730,591	1,002,130		50,031,130	(196,520,194)	(49,861,456)	(1,547,805,787)	970,524
Initial effect by the adoption of IFRS 9	(24,957)
Adjusted balance as of January 1, 2018 | From prior years [member]								$ (1,752,732,435)
Adjusted balance as of January 1, 2018	$ (1,502,377,342)	$ 356,544,447	$ 43,730,591	$ 1,002,130		$ 44,633,012	$ (196,520,194)		$ (1,503,342,449)	$ 965,107

Unaudited Statements of Cash Fl

Unaudited Statements of Cash Flows - MXN ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Operating activities
Net (loss) income	$ (49,860,395)	$ 120,715,749
Depreciation and amortization	73,733,715	73,422,650
(Reversal) impairment of wells, pipelines, properties, plant and equipment	(42,360,452)	3,401,410
Profit sharing duty and income tax	225,597,266	198,571,462
Deferred profit-sharing duty and income tax	(400,877)	6,554,663
Unsuccessful wells	9,054,121	3,051,614
Exploration costs	(366,759)	(183,493)
Loss of derecognition of wells, pipelines, properties, plant and equipment	9,757,868	3,996,360
Profit share in joint ventures and associates	(848,136)	(874,954)
Decrease on available-for-sale financial assets		(193,731)
Effects of net present value of reserve for well abandonment	1,081,276	1,437,130
Unrealized foreign exchange (income)	(1,246,452)	(202,112,496)
Interest income	(10,969,569)	(7,301,747)
Interest expense	56,972,817	49,612,925
Derivative financial instruments	185,364	(33,968,222)
Accounts receivable	3,819,228	13,871,524
Inventories	10,533,108	(6,050,497)
Long-term receivables	(867,867)	(1,913,030)
Other assets	(4,348,676)	(2,265,445)
Accounts payable and accrued expenses	(1,909,642)	3,574,869
Taxes and duties paid	(216,476,527)	(200,170,900)
Other taxes and duties	(3,416,177)	(2,042,135)
Suppliers	(30,484,014)	(43,260,396)
Provisions for sundry creditors	6,558,766	(16,959,476)
Employee benefits	29,471,820	31,531,893
Net cash flows from (used in) operating activities	63,209,806	(7,554,273)
Investing activities
Acquisition of wells, pipelines, properties, plant and equipment	(32,524,383)	(32,055,318)
Intangible assets	(7,983,152)	(88,885)
Interest received	6,233,552	2,804,625
Proceeds from equity instruments		684,030
Net cash flows used in investing activities	(34,273,983)	(28,655,548)
Financing activities
Loans obtained from financial institutions	449,928,638	286,723,631
Debt payments, principal only	(416,412,383)	(242,651,426)
Interest paid	(56,785,264)	(51,576,682)
Net cash flows from financing activities	(23,269,009)	(7,504,477)
Net increase (decrease) in cash and cash equivalents	5,666,814	(43,714,298)
Effects of foreign exchange on cash balances	5,988,143	(9,287,298)
Cash and cash equivalents at the beginning of the period	97,851,754	163,532,513
Cash and cash equivalents at the end of the period (Note 7)	$ 109,506,711	$ 110,530,917

Structure and Business Operatio

Structure and Business Operations of Petroleos Mexicanos, Subsidiary Entities and Subsidiary Companies	6 Months Ended
	Jun. 30, 2018
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 the Decreto por el que se reforman y adicionan diversas disposiciones de la Constitución Política de los Estados Unidos Mexicanos, en Materia de Energía In accordance with the Energy Reform Decree, the Mexican Government will carry out the exploration and extraction of hydrocarbons in the United Mexican States (“Mexico”) through assignments to productive state-owned companies, as well as through agreements with productive state-owned companies and with other companies. As part of the secondary legislation enacted in accordance with the Energy Reform Decree, on August 11, 2014, the Ley de Petróleos Mexicanos Secretaría de Energía Disposiciones Generales de Contratación para Petróleos Mexicanos y sus Empresas Productivas Subsidiarias Once the Petróleos Mexicanos Law came into effect, Petróleos Mexicanos was transformed from a decentralized public entity to a productive state-owned company. Petróleos Mexicanos is a legal entity empowered to own property and carry on business in its own name with the purpose of carrying out exploration and extraction of crude oil and other hydrocarbons in 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. As of June 30, 2018, 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 approved 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 acuerdos de creación (creation resolutions) of each productive state-owned subsidiary. The Subsidiary Entities, and their respective primary purposes, are as follows: • Pemex Exploration and Production: This entity is in charge of exploration and extraction of crude oil and solid, liquid or gaseous hydrocarbons in Mexico, in the exclusive economic zone of Mexico and abroad. • 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 these financial statements, 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 has significant influence (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	6 Months Ended
	Jun. 30, 2018
Text block1 [abstract]
Basis of Preparation	NOTE 2. BASIS OF PREPARATION a. Statement of compliance PEMEX prepared its unaudited condensed consolidated interim financial statements as of June 30, 2018 and December 31, 2017, and for the three and six-month These unaudited condensed consolidated interim financial statements do not include all the information and disclosures required for full annual consolidated financial statements and should be read in conjunction with PEMEX’s audited consolidated financial statements for the year ended December 31, 2017. PEMEX estimates that there is no significant impact on its unaudited condensed consolidated interim financial statements due to the seasonality of operations. These unaudited condensed consolidated interim financial statements follow the same accounting policies and methods of computation as the most recent annual financial statements, except for the adoption of IFRS 9 and IFRS 15 “Revenue from Contracts with Customers” (see Note 3- On October 8, 2018, these unaudited condensed consolidated interim 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. b. Basis of measurement and going concern These unaudited condensed consolidated interim 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. The principal items measured at fair value are derivative financial instruments (“DFIs”) and equity instruments; the principal item measured at amortized cost is debt, the principal item measured at present value is the provision for employee benefit. Investments in joint ventures and associates measured through equity method. Going concern The unaudited condensed consolidated interim financial statements have been prepared on a going concern basis, which assumes that PEMEX can meet its payment obligations. During the six months ended June 30, 2018, PEMEX recognized a net loss of Ps. 49,860,395 caused mainly by the depreciation of the peso relative to the U.S. dollar, as well as the heavy tax burden applicable to the industry. In addition, PEMEX had a negative equity of Ps. 1,546,835,263 and Ps. 1,502,352,385 as of June 30, 2018 and December 31, 2017, respectively, and a negative working capital of Ps. 8,450,455 and Ps. 25,600,895, respectively. 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 unaudited condensed consolidated interim 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: • Plan for 2018 farm-out • Pemex Exploration and Production will continue to focus its investments on the most profitable projects, as well as on farm-outs and other partnerships aimed at increasing hydrocarbon operation and production together with the discovery of crude oil and gas. Additionally Pemex Exploration and Production will focus its efforts on the following strategies: (1) establishing a model of exploration that allows it to achieve the objective of incorporating and increasing proved reserves; (2) developing a master plan for the development of shales; (3) containing and reversing declines in the production of wells through reactivation and maintenance activities performed on closed wells through integrated services; (4) continuing with farm-outs to develop complex fields and leverage third-party resources; (5) establishing schemes, including strategic partnerships and alliances, to attract additional investment; (6) increasing revenues from hydrocarbons trading; and (7) strengthening operational efficiency and cost control. • Pemex Industrial Transformation continues working in 2018 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. • Pemex Logistics received approval from the Comisi ó n Reguladora de Energ í a • 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 and the maximization and reactivation of the production of goods and services through strategic alliances. In addition, PEMEX also continues to take certain specific measures to improve its financial position, including the following: • Pension Reform • Asset Sales non-essential • Decreased Debt Financing • 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. • Since 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 PEMEX prepared its unaudited condensed consolidated interim financial statements as of June 30, 2018 and December 31, 2017 on a going concern basis. There are certain conditions that have generated material 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 unaudited condensed consolidated interim financial statements are presented in Mexican pesos, which is both PEMEX’s functional currency and reporting currency, due to the following: i. the economic environment in which PEMEX operates is Mexico, where the legal currency is the Mexican peso; ii. 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. As of June 30, 2018 and December 2017, the employee benefits provision was approximately 35% of PEMEX’s total liabilities, 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 unaudited condensed consolidated interim 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 unaudited condensed consolidated interim 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

Significant Accounting Policies

Significant Accounting Policies	6 Months Ended
	Jun. 30, 2018
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Significant Accounting Policies	NOTE 3. SIGNIFICANT ACCOUNTING POLICIES The preparation of the unaudited condensed consolidated interim 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 unaudited condensed consolidated interim financial statements, as well as the recorded amounts of income, costs and expenses during the period. Significant estimates and underlying assumptions are reviewed, and the effects of such revisions are recognized in the period 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 unaudited condensed consolidated interim financial statements are described in the following notes: • Note 3(d) Financial instruments – determination of fair values • Note 3(f) Wells, pipelines, properties, plant and equipment, including the successful efforts method – economic feasibility determining to capitalize assets • Note 3(h) Impairment of non-financial • Note 3(j) Provisions – environmental liabilities and retirement of assets • Note 3(k) Employee benefits – actuarial assumptions and hypothesis • Note 3(l) Income taxes and duties – assessment of deferred income tax asset recovery • Note 3(m) Contingencies – assessment of likelihood of contingency of existence 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 periods presented and followed by PEMEX in the preparation of its unaudited condensed consolidated interim financial statements: a. Basis of consolidation The unaudited condensed consolidated interim 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 unaudited condensed consolidated interim financial statements pursuant to IFRS 10, “Consolidated Financial Statements” (“IFRS10”). 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. 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’ unaudited condensed consolidated interim 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. The unaudited condensed consolidated interim financial statements include the proportion of gains and losses 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 unaudited condensed consolidated interim statements of financial position, the unaudited condensed consolidated interim 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. 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 c. 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. d. Financial instruments Policy applicable in 2018 and 2017 i. Recognition and initial measurement Trade receivables and debt securities issued are initially recognized when they are originated. All other financial assets and financial liabilities are initially recognized when PEMEX becomes a party to the contractual provisions of the instrument. A financial asset (unless it is a trade receivable without a significant financing component) or financial liability is initially measured at fair value plus, for an item not at FVTPL (as defined below), transaction costs that are directly attributable to its acquisition or issue. A trade receivable without a significant financing component is initially measured at the transaction price. Policy applicable from January 1, 2018 ii. Classification and subsequent measurement Financial Assets On initial recognition, a financial asset is classified as measured at: Amortized Cost; Fair Value Through Other Comprehensive Income (“FVTOCI”)-debt investment; FVTOCI-equity investment; or Fair Value Through Profit and Losses (“FVTPL”). Financial assets are not reclassified subsequent to their initial recognition unless PEMEX changes its business model for managing financial assets, in which case all affected financial assets are reclassified on the first day of the first reporting period following the change in the business model. A financial asset is measured at amortized cost if it meets both of the following conditions and is not designated as at FVTPL: • it is held within a business model whose objective is to hold assets to collect contractual cash flows; and • its contractual terms give rise on specified dates to cash flows that are solely payments of principal and interest on the principal amount outstanding. A debt instrument is measured at FVTOCI only if it meets both of the following conditions and is not designated as at FVTPL: • it is held within a business model whose objective is achieved by both collecting contractual cash flows and selling financial assets; and • its contractual terms give rise on specified dates to cash flows that are solely payments of principal and interest on the principal amount outstanding. On initial recognition of an equity investment that is not held for trading, PEMEX may irrevocably elect to present subsequent changes in fair value in OCI. This election is made on an investment-by-investment All financial assets not classified as measured at amortized cost or FVOCI (as described above) are measured at FVTPL. This includes all derivative financial assets (see Note 16). On initial recognition, PEMEX may irrevocably designate a financial asset that otherwise meets the requirements to be measured at amortized cost or at FVOCI as FVTPL, if doing so eliminates or significantly reduces an accounting mismatch that would otherwise arise. Policy applicable from January 1, 2018 Financial assets - Business model assessment PEMEX makes an assessment of the objective of the business model in which a financial asset is held at a portfolio level because this best reflects the way the business is managed and information is provided to management. The information considered includes: • the stated policies and objectives for the portfolio and the operation of those policies in practice, which include whether management’s strategy focuses on earning contractual interest income, maintaining a particular interest rate profile, matching the duration of the financial assets to the duration of any related liabilities or expected cash outflows or realizing cash flows through the sale of the assets; • how the performance of the portfolio is evaluated and reported to PEMEX management; • the risk that affects the performance of the business model (and the financial assets held within that business model) and how those risks are managed; • how managers of the business are compensated (e.g., whether compensation is based on the fair value of the assets, managed or the contractual cash flows collected), and • the frequency, volume and timing of sales in prior periods, the reasons for such sales and its expectations about future sales activity. Transfers of financial assets to third parties in transactions that do not qualify for derecognition are not considered sales for this purpose, consistent with PEMEX’s continuing recognition of the assets. Financial assets that are held for trading or managed and whose performance is evaluated on a fair value basis are measured at FVTPL. Policy applicable from January 1, 2018 Financial Asset - Assessment whether contractual cash flows are solely payments of principal and interest. For the purposes of this assessment, principal is defined as the fair value of the financial assets on initial recognition. Interest is defined as consideration for the time value of money and for the credit risk associated with the principal amount outstanding during period of time and for the basic lending risks and costs (e.g., liquidity risk and administrative costs), as well as profit margin. In assessing whether the contractual cash flows are solely payments of principal and interest, PEMEX considers the contractual terms of the instrument, which includes assessing whether the financial asset contains a contractual term that could change the timing or amount of contractual cash flows such that it would not meet this condition. In making this assessment, PEMEX considers: • contingent events that would change the amount or timing of cash flows; • terms that may adjust the contractual coupon rate, including variable rate features; • prepayment and extension features; and • terms that limit PEMEX’s claim to cash flows from specified assets (for example, non-recourse A prepayment feature is consistent solely with the payments of principal and interest criterion if the prepayment amount substantially represents unpaid amounts of principal and interest on the principal amount outstanding, which may include reasonable additional compensation for early termination of the contract. Additionally, for a financial asset acquired at a significant discount or premium to its contractual par amount, a feature that permits or requires prepayment at an amount that substantially represents the contractual par amount plus accrued (but unpaid) contractual interest (which may also include reasonable additional compensation for early termination) is treated as consistent with this criterion if the fair value of the prepayment feature is insignificant at initial recognition. Policy applicable from January 1, 2018 Financial assets – Subsequent measurement and gain and losses Financial assets at FVTPL Financial assets at FVTPL are measured at fair value and changes therein, including any interest or dividend income, are recognized in profit or loss. Financial assets at amortized cost These assets are subsequently measured at amortized cost using the effective interest method. The amortized cost is reduced by impairment losses. Interest income, foreign exchange gains and losses and impairment are recognized in profit or loss. Any gain or loss on derecognition is recognized in profit or loss. Debt investments at FVOCI These assets are subsequently measured at fair value. Interest income calculated using the effective interest method, foreign exchange gains and losses and impairment are recognized in profit or loss. Other net gains and losses are recognized in OCI. On derecognition, gains and losses accumulated in OCI are reclassified to profit or loss. Equity investments at FVOCI These assets are subsequently measured at fair value. Dividends are recognized as income in profit or loss unless the dividend clearly represents a recovery of part of the cost of the investment. Other net gains and losses are recognized in OCI and are never reclassified to profit or loss. Policy applicable before January 1, 2018 Financial assets 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 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. Policy applicable in 2018 and 2017 Derivative financial instruments DFIs presented in the consolidated statements of financial position were valued at fair value. In the case of DFIs held for trading, changes in fair value were taken directly to profit or loss for the period; in the case of DFIs formally designated as and that qualify for hedging, they are accounted for the following the fair value or cash flow hedge accounting model. 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. Financial liabilities: Classification, subsequent measurement and gains and losses Financial liabilities are classified as measured at amortized cost or FVTPL. A financial liability is classified as FVTPL if it is classified as held-for-trading, iii. Derecognition Financial assets PEMEX derecognizes a financial asset when the contractual rights to the cash flows from the financial asset expire, or it transfers the rights to receive the contractual cash flows in a transaction in which substantially all of the risks and rewards of ownership of the financial asset are transferred or in which PEMEX neither transfers nor retains substantially all of the risks and rewards of ownership and it does not retain control of the financial asset. PEMEX enters into transactions whereby it transfers assets recognized in its statement of financial position, but retains either all or substantially all of the risks and rewards of the transferred assets. In these cases, the transferred assets are not derecognized. Financial liabilities PEMEX derecognizes a financial liability when its contractual obligations are discharged or cancelled, or expire. PEMEX also derecognizes a financial liability when its terms are modified and the cash flows of the modified liability are substantially different, in which case a new financial liability based on the modified terms is recognized at fair value. On derecognition of a financial liability, the difference between the carrying amount extinguished and the consideration paid (including any non-cash iv. Offsetting Financial assets and financial liabilities are offset and the net amount is presented in the statement of financial position when, and only when, PEMEX currently has a legally enforceable right to set off the amounts and it intends either to settle them on a net basis or to realize the asset and settle the liability simultaneously. v. Derivative financial instruments and hedge accounting PEMEX holds derivative financial instruments to hedge its foreign currency and interest rate risk exposures. Embedded derivatives are separated from the host contract and accounted for separately if the host contract is not a financial asset and certain criteria are met. Derivatives are initially measured at fair value. Subsequent to initial recognition, derivatives are measured at fair value, and changes therein are generally recognized in profit or loss. PEMEX uses derivative financial instruments to hedge the risk exposure in foreign currency, interest rate and the price of its products. However, these contracts are not accounted as designated hedges. DFIs are initially recognized at fair value on the date on which a derivative contract is entered into and after initial recognition are measured again at fair value. Derivatives are accounted for as financial assets when the fair value is positive and as a financial liability when the fair value is negative. Any gain or loss arising from changes in the fair value of the derivatives is recognized directly in the income statement. Policy applicable from January 1, 2018 vi. Impairment Financial instruments and contract assets PEMEX recognizes loss allowances for Estimated Credit Losses (“ECLs”) on: • financial assets measured at amortized cost; • debt investments measured at FVOCI; and • contract assets (as defined in IFRS 15). PEMEX measures loss allowances at an amount equal to lifetime ECL, except for the following, which are measured as 12-month • debt securities that are determined to have low credit risk at the reporting date; and • other debt securities and bank balances for which credit risk (i.e. the risk of default occurring over the expected life of the financial instrument) has not increased significantly since initial recognition. Loss allowances for trade receivables and contract assets are always measured at an amount equal to lifetime ECL. When determining whether the credit risk of a financial asset has increased significantly since initial recognition and when estimating ECL, PEMEX considers reasonable and supportable information that is relevant and available without undue cost or effort. This includes both quantitative and qualitative information and analysis, based on PEMEX’s historical experience and informed credit assessment which includes forward-looking information. PEMEX assumes that the credit risk on a financial asset has increased significantly if it does not comply with the terms established in the contract. PEMEX considers a financial asset to be in default when the borrower is unlikely to pay its credit obligations to PEMEX in full, without recourse by PEMEX to actions such as realizing security (if any is held). PEMEX considers that a debt instrument has a low credit risk, when its credit rating is classified as ‘investment grade’. The investment grade classification is based on minimum credit ratings of Baa3 (Moody’s) and BBB- Lifetime ECLs are the ECLs that result from all possible default events over the expected life of a financial instrument. 12-month The maximum period considered when estimating ECLs is the maximum contractual period over which PEMEX is exposed to credit risk. Measurement of ECLs ECLs are a probability-weighted estimate of credit losses. Credit losses are measured as the present value of all cash shortfalls (for example, the difference between the cash flows due to the entity in accordance with the contract and the cash flows that PEMEX expects to receive). ECLs are discounted at the effective interest rate of the financial asset. Credit-impaired financial assets At each reporting date, PEMEX assesses whether financial assets carried at amortized cost and debt securities at FVOCI are credit-impaired. A financial asset is ‘credit-impaired’ when one or more events that have a detrimental impact on the estimated future cash flows of the financial asset have occurred. Evidence that a financial asset is credit-impaired includes the following observable data: • significant financial difficulty of the borrower or issuer; • a breach of contract such as a default or being more than 90 days past due; • the restructuring of a loan or advance by PEMEX on terms that it would not consider otherwise; • it is probable that the borrower will enter bankruptcy or other financial reorganization; or • the disappearance of an active market for a security because of financial difficulties. Presentation of allowance for ECL in the unaudited condensed consolidated interim statement of financial position Loss allowances for financial assets measured at amortized cost are deducted from the gross carrying amount of the assets. For debt securities at FVOCI, the loss allowance is charged to profit or loss and is recognized in OCI. Write-off The gross carrying amount of a financial asset is written off (either partially or in full) to the extent that there is no realistic prospect of recovery. This is generally the case when PEMEX determines that the debtor does not have assets or sources of income that could generate sufficient cash flows to repay the amounts subject to the write-off. Policy applicable before January 1, 2018 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 OCI 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 OCI. e. 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. f. 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 reitions 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

Subsidiary Entities and Subsidi

Subsidiary Entities and Subsidiary Companies	6 Months Ended
	Jun. 30, 2018
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Subsidiary Entities and Subsidiary Companies	NOTE 4. SUBSIDIARY ENTITIES AND SUBSIDIARY COMPANIES As of June 30, 2018, 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)(vi) • P.M.I. Trading, Ltd. (PMI Trading) (i) • PEMEX Internacional España, S. A. (PMI SES) (i)(iv) • 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)(v) • 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)(vii) • 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)(viii) • PMX Cogeneración S.A.P.I. de C.V. (PMX COG) (iv) (viii) • 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) (iii) • Holdings Holanda Services, B.V. (HHS) (vi) i. Member Company of the “PMI Subsidiaries”. ii. Non-controlling iii. As of January 2017, this company started operations and was included in the consolidated financial statements of PEMEX. iv. As of February 2017, this company merged with HPE. v. As of June 2017, this company merged with SUS. vi. As of October 2017, PMI HBV was divided, and HHS was created and included in the consolidated financial statements of PEMEX. vii. This company was liquidated. viii. 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	6 Months Ended
	Jun. 30, 2018
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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 Aeropuertos y Servicios Auxiliares The industrial transformation segment also earns revenues from domestic sources generated by sales of natural gas, liquefied petroleum gas, naphtha, butane and ethane and certain other petrochemicals such as methane derivatives, ethane derivatives, aromatics and derivatives. • The cogeneration segment receives income from the cogeneration, supply and sale of electricity and thermal energy, and it 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 six month Exploration Industrial Cogeneration Drilling Logistics Fertilizers Ethylene Trading Corporate Intersegment Total Sales: Trade 235,689,465 481,690,782 — — — 1,773,974 6,563,445 101,552,868 2,012,018 — 829,282,552 Intersegment 213,902,695 85,736,578 — 2,212,873 32,019,150 1,046,387 704,832 323,999,851 48,776,165 (708,398,531 ) — Services income — 362,963 — 25,156 2,489,437 1,948 5,578 35,821 1,366,587 — 4,287,490 (Reversal) impairment of wells pipe-lines, properties, plant and equipment (36,711,403 ) (7,803,065 ) — — — 2,154,016 — — — — (42,360,452 ) Cost of sales 210,101,903 563,862,842 — 1,060,852 20,167,802 3,411,785 7,353,302 417,171,921 24,906,788 (667,061,674 ) 580,975,521 Gross income (loss) 276,201,660 11,730,546 — 1,177,177 14,340,785 (2,743,492 ) (79,447 ) 8,416,619 27,247,982 (41,336,857 ) 294,954,973 Other revenues (expenses), net 4,101,924 3,348,024 1,788 (1,932,918 ) (14,265,893 ) 25,831 67,732 447,308 1,520,399 14,409,860 7,724,055 Distribution, transportation and sales expenses 124,828 12,392,562 — 63 15,382 179,403 82,391 232,858 37,459 (1,990,895 ) 11,074,051 Administrative expenses 27,360,806 21,236,183 — 352,138 4,550,764 242,689 626,410 916,991 34,198,389 (25,158,088 ) 64,326,282 Operating income (loss) 252,817,950 (18,550,175 ) 1,788 (1,107,942 ) (4,491,254 ) (3,139,753 ) (720,516 ) 7,714,078 (5,467,467 ) 221,986 227,278,695 Financing income 42,975,869 4,867,481 1 142,575 612,787 2,818 11,729 370,485 70,368,989 (108,383,165 ) 10,969,569 Financing cost (59,110,719 ) (973,317 ) — (381,390 ) (144,266 ) (189,543 ) (25,559 ) (732,894 ) (103,576,300 ) 108,161,171 (56,972,817 ) Derivative financial instruments (loss) gain, net (9,682,793 ) (20,907 ) — — — — — (1,661,925 ) 2,072,712 7 (9,292,906 ) Foreign exchange (loss) income, net 8,727,059 (1,599,203 ) — (34,203 ) (98,860 ) (10,478 ) (10,478 ) 265,227 (4,733,747 ) — 2,505,317 (Loss) profit sharing in associates 60,095 — — — (553 ) — — 432,093 (5,268,146 ) 5,624,647 848,136 Taxes, duties and other 226,543,089 — — (411,178 ) (6,126,518 ) — — 3,865,394 1,325,602 — 225,196,389 Net (loss) income 9,244,372 (16,276,121 ) 1,789 (969,782 ) 2,004,372 (3,336,956 ) (744,824 ) 2,521,670 (47,929,561 ) 5,624,646 (49,860,395 ) Total current assets 1,092,665,803 228,874,626 — 8,774,048 31,284,758 1,963,988 4,276,184 148,590,483 536,016,409 (1,689,878,695 ) 362,567,604 Investments in joint ventures and associates 124,423 4 — — 17,783 — — 15,965,142 (466,946,467 ) 467,777,870 16,938,755 Wells, pipelines, properties, plant and equipment, net 943,299,127 289,594,157 — 17,478,212 117,402,968 3,659,202 18,479,853 6,763,729 33,546,577 — 1,430,223,825 Total assets 2,109,752,502 519,391,505 — 27,119,590 179,211,676 5,675,237 22,917,849 177,847,795 2,159,248,411 (3,068,456,971 ) 2,132,707,594 Total current liabilities 292,778,523 126,822,276 — 2,924,666 29,530,499 6,531,365 2,703,176 100,825,821 1,491,499,353 (1,682,597,620 ) 371,018,059 Long-term debt 1,849,958,235 21,262,169 — 10,814,834 2,438,389 — — 2,344,152 1,862,043,745 (1,845,631,186 ) 1,903,230,338 Employee benefits 380,688,849 603,048,228 — 349,713 1,952,532 105,605 111,353 (930,408 ) 302,582,070 — 1,287,907,942 Total liabilities 2,613,361,506 755,563,795 — 15,587,610 40,684,421 6,640,994 2,846,006 105,534,647 3,675,558,718 (3,536,234,840 ) 3,679,542,857 Equity (deficit), net (503,609,004 ) (236,172,290 ) — 11,531,980 138,527,255 (965,757 ) 20,071,843 72,313,148 (1,516,310,307 ) 467,777,869 (1,546,835,263 ) Depreciation and amortization 59,022,608 9,303,331 — 1,150,621 2,533,607 (47,399 ) 691,806 31,225 1,047,916 — 73,733,715 Net periodic cost of employee benefits 17,203,359 27,159,469 — 16,500 109,640 7,245 6,320 16,764 13,523,709 — 58,043,006 Acquisition of wells, pipelines, properties, plant and equipment 26,220,322 5,598,406 — 305,607 1,203,918 60,585 162,838 72,176 1,221,778 — 34,845,630 As of/for the six month Exploration and Industrial Cogeneration Drilling Logistics Fertilizers Ethylene Trading Corporate and Intersegment Total Sales: Trade — 418,708,519 — — — 2,290,875 6,112,538 234,763,658 1,638,671 — 663,514,261 Intersegment 387,322,281 67,897,390 20,796 1,666,398 45,641,151 51,300 950,069 248,203,044 33,189,159 (784,941,588 ) — Services income — 3,053,130 39,241 12,852 1,774,738 1,488 16,051 382,655 588,418 (447,467 ) 5,421,106 Impairment of wells pipe- lines, properties, plant and equipment 5,343,634 (3,977,849 ) — 2,035,625 — — — — — — 3,401,410 Cost of sales 184,384,848 514,898,359 70,205 619,910 21,607,682 2,692,122 6,918,801 476,326,584 11,762,832 (756,551,811 ) 462,729,532 Gross income (loss) 197,593,799 (21,261,471 ) (10,168 ) (976,285 ) 25,808,207 (348,459 ) 159,857 7,022,773 23,653,416 (28,837,244 ) 202,804,425 Other revenues (expenses), net 15,539,472 1,292,008 — (90,423 ) 65,590 8,658 (7,624 ) (5,857,219 ) 900,306 (25,415 ) 11,825,353 Distribution, transportation and sales expenses — 15,467,380 4,392 — 32,186 231,962 167,348 158,261 18,644 (4,546,078 ) 11,534,095 Administrative expenses 28,475,643 18,824,418 16,858 493,768 3,626,719 243,137 574,522 798,932 30,281,796 (24,512,579 ) 58,823,214 Operating income (loss) 184,657,628 (54,261,261 ) (31,418 ) (1,560,476 ) 22,214,892 (814,900 ) (589,637 ) 208,361 (5,746,718 ) 195,998 144,272,469 Financing income 69,818,829 5,584,282 — 20,592 471,888 990 31,278 462,796 74,909,454 (143,998,362 ) 7,301,747 Financing cost (65,802,803 ) (1,265,639 ) (11,532 ) (417,107 ) (131,032 ) (77,849 ) (16 ) (554,405 ) (125,284,874 ) 143,932,332 (49,612,925 ) Derivative financial instruments (loss) gain, net 60,229 1,217 — — — — — 401,399 19,870,040 — 20,332,885 Foreign exchange (loss) income, net 173,933,137 12,167,046 — 899,966 757,272 17,956 (3,942 ) (74,187 ) 14,965,495 — 202,662,743 (Loss) profit sharing in associates 30,869 8,898 — — — — — 681,074 143,878,951 (143,724,838 ) 874,954 Taxes, duties and other 198,282,332 — — — 4,863,301 — — 2,136,487 (155,996 ) — 205,126,124 Net (loss) income 164,415,557 (37,765,457 ) (42,950 ) (1,057,025 ) 18,449,719 (873,803 ) (562,317 ) (1,011,449 ) 122,748,344 (143,594,870 ) 120,705,749 Total current assets 964,913,349 462,726,752 373,075 5,127,722 42,878,368 973,042 3,775,048 105,579,201 467,085,984 (1,729,964,853 ) 323,467,688 Investments in joint ventures and associates 170,393 258,066 — — — — — 16,177,240 (110,495,118 ) 114,912,582 21,023,163 Wells, pipelines, properties, plant and equipment, net 1,109,802,774 307,817,470 — 17,888,173 119,066,085 7,638,625 19,539,341 6,097,057 34,783,060 — 1,622,632,585 Total assets 2,111,214,443 771,049,731 373,087 23,633,374 179,130,478 8,666,191 23,414,242 132,925,292 2,202,326,329 (3,216,451,328 ) 2,236,281,839 Total current liabilities 267,249,434 361,029,037 489,095 2,193,240 17,339,578 2,975,536 1,838,802 61,377,372 1,372,311,581 (1,724,921,515 ) 361,882,160 Long-term debt 1,593,356,596 23,733,417 — 11,090,841 3,139,978 — — 2,788,070 1,608,410,163 (1,593,095,189 ) 1,649,423,876 Employee benefits 372,165,984 590,820,264 202,730 461,089 602,008 22,824 23,951 (703,089 ) 288,348,867 — 1,251,944,628 Total liabilities 2,307,044,263 979,866,886 692,443 13,816,296 26,070,184 2,998,974 1,870,963 68,760,183 3,287,511,886 (3,331,363,910 ) 3,357,268,168 Equity (deficit), net (195,829,820 ) (208,817,155 ) (319,356 ) 9,817,078 153,060,294 5,667,217 21,543,279 64,165,109 (1,085,185,557 ) 114,912,582 (1,120,986,329 ) Depreciation and amortization 59,311,370 8,916,655 — 1,177,076 2,223,185 202,793 653,504 (51,384 ) 989,451 — 73,422,650 Net periodic cost of employee benefits 17,588,809 28,026,525 10,854 19,962 30,306 2,462 2,058 19,371 13,337,718 — 59,038,065 Acquisition of wells, pipelines, properties, plant and equipment 31,083,773 1,326,858 — 182,596 1,541,121 69,784 109,211 198 1,397,177 — 35,710,718 As of the year ended Exploration and Industrial Cogeneration Services Drilling and Logistics Fertilizers Ethylene Trading Corporate and Intersegment Total 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 ) 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 4,832,462 — 93,979,818 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 in the unaudited condensed consolidated interim financial statements. For certain of the items in these unaudited condensed consolidated interim financial statements to agree 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: As of/for the Exploration and Industrial Cogeneration Drilling Logistics Fertilizers Ethylene Trading Corporate and Sales: By segment Ps. 449,592,160 568,641,592 — 3,651,556 34,508,587 2,822,309 7,273,855 425,642,969 52,154,770 Less unrealized intersegment sales — (851,269 ) — (1,413,527 ) — — — (54,429 ) — Total consolidated sales Ps. 449,592,160 567,790,323 — 2,238,029 34,508,587 2,822,309 7,273,855 425,588,540 52,154,770 Operating income (loss): By segment Ps. 253,357,916 (133,275 ) 1,788 (380,095 ) (2,481,028 ) (3,317,231 ) (1,340,824 ) 8,112,877 (5,467,467 ) Less unrealized intersegment sales — (851,269 ) — (1,413,527 ) — — — (54,429 ) — Less unrealized gain due to production cost valuation of inventory (335,833 ) (17,565,631 ) — 388,751 — — — (344,369 ) — Less capitalized refined products (263,624 ) — — — — — — — — Less amortization of capitalized interest 59,491 — — — — — — — — Less depreciation of revaluated assets — — — 296,929 (2,010,226 ) 177,478 620,308 — — Total consolidated operating income (loss) Ps. 252,817,950 (18,550,175 ) 1,788 (1,107,942 ) (4,491,254 ) (3,139,753 ) (720,516 ) 7,714,079 (5,467,467 ) Net income (loss): By segment Ps. 9,805,251 2,862,326 1,789 (493,393 ) 2,417,967 (3,911,486 ) (1,069,148 ) 2,920,468 (47,929,561 ) Less unrealized intersegment sales — (851,269 ) — (1,413,527 ) — — — (54,429 ) — Less unrealized gain due to production cost valuation of inventory (335,833 ) (17,565,631 ) — 388,751 — — — (344,369 ) — Less capitalized refined products (263,624 ) — — — — — — — — Less equity method elimination (20,913 ) (721,547 ) — — 311 397,052 (295,984 ) 1 — Less amortization of capitalized interest 59,491 — — — — — — — — Less depreciation of revaluated assets — — — 548,387 (413,906 ) 177,478 620,308 — — Total consolidated net (loss) income Ps. 9,244,372 (16,276,121 ) 1,789 (969,782 ) 2,004,372 (3,336,956 ) (744,824 ) 2,521,671 (47,929,561 ) Assets: By segment Ps. 2,136,833,275 594,079,464 — 29,277,969 263,496,192 10,541,420 32,133,052 187,936,000 2,159,248,410 Less unrealized intersegment sales 1,057,924 (6,241,247 ) — — 7,184 (26,886 ) (5,304 ) (462,489 ) — Less unrealized gain due to production cost valuation of inventory (3,993,365 ) (59,944,861 ) — — — — — (8,465,262 ) — Less capitalized refined products (263,624 ) — — — — — — — — Less depreciation of revalued assets (23,160,662 ) — — (2,158,379 ) (84,205,024 ) (1,980,175 ) (8,902,379 ) (424,850 ) — Less equity method for unrealized profits (780,537 ) (8,509,974 ) — — (86,676 ) (2,859,122 ) (307,520 ) (735,604 ) — Less amortization of capitalized interest 59,491 8,123 — — — — — — — Total consolidated assets Ps. 2,109,752,502 519,391,505 — 27,119,590 179,211,676 5,675,237 22,917,849 177,847,795 2,159,248,410 Liabilities: By segment Ps. 2,613,361,506 759,983,725 — 14,700,897 40,684,421 6,640,994 2,846,006 106,245,862 3,675,558,718 Less unrealized intersegment sales — (4,419,930 ) — 886,713 — — — (711,215 ) — Total consolidated liabilities Ps. 2,613,361,506 755,563,795 — 15,587,610 40,684,421 6,640,994 2,846,006 105,534,647 3,675,558,718 As of/for the six month Exploration and Industrial Cogeneration Drilling Logistics Fertilizers Ethylene Trading Corporate and Sales: By segment Ps. 387,322,281 490,816,991 60,037 2,761,289 47,415,890 2,380,931 7,078,657 483,379,785 37,529,927 Less unrealized intersegment sales — (1,157,952 ) — (1,082,039 ) — (37,267 ) — (30,428 ) — Total consolidated sales Ps. 387,322,281 489,659,039 60,037 1,679,250 47,415,890 2,343,664 7,078,657 483,349,357 37,529,927 Operating income (loss): By segment Ps. 184,850,445 (51,285,496 ) (31,418 ) (1,771,044 ) 18,769,749 (956,346 ) (1,273,795 ) 130,103 (5,746,720 ) Less unrealized intersegment sales — (1,157,952 ) — (1,082,039 ) — (37,267 ) — (30,428 ) — Less unrealized gain due to production cost valuation of inventory (114,602 ) (1,817,814 ) — 980,327 — — — 108,686 — Less capitalized refined products (137,708 ) — — — — — — — — Less amortization of capitalized interest 59,491 — — — — — — — — Less depreciation of revaluated assets — — — 312,280 3,445,143 178,715 684,156 — — Total consolidated operating income (loss) Ps. 184,657,626 (54,261,262 ) (31,418 ) (1,560,476 ) 22,214,892 (814,898 ) (589,639 ) 208,361 (5,746,720 ) Net income (loss): By segment Ps. 164,547,750 (34,979,887 ) (139,629 ) (1,267,592 ) 15,004,575 8,506,409 (1,147,445 ) (1,089,708 ) 122,748,339 Less unrealized intersegment sales — (1,157,952 ) — (1,082,039 ) — (37,267 ) — (30,428 ) — Less unrealized gain due to production cost valuation of inventory (114,602 ) (1,817,814 ) — 980,327 — — — 108,686 — Less capitalized refined products (137,708 ) — — — — — — — — Less equity method elimination 60,626 190,197 96,679 — — (9,521,659 ) (99,030 ) — — Less amortization of capitalized interest 59,491 — — — — — — — — Less depreciation of revaluated assets — — — 312,280 3,445,143 178,715 684,156 — — Total consolidated net (loss) income Ps. 164,415,557 (37,765,456 ) (42,950 ) (1,057,024 ) 18,449,718 (873,802 ) (562,319 ) (1,011,450 ) 122,748,339 Assets: By segment Ps. 2,136,980,546 1,138,758,388 319,675 26,583,936 299,475,440 17,670,356 36,369,522 142,127,674 2,202,326,329 Less unrealized intersegment sales 605,205 (5,324,176 ) — — 7,184 — (5,304 ) (362,958 ) — Less unrealized gain due to production cost valuation of inventory (3,361,384 ) (35,179,252 ) — — — (37,267 ) — (6,711,506 ) — Less capitalized refined products (137,708 ) — — — — — — — — Less depreciation of revalued assets (22,250,279 ) — — (2,950,563 ) (120,352,146 ) (5,121,329 ) (12,061,980 ) (424,850 ) — Less equity method for unrealized profits (681,429 ) (7,063,571 ) 53,411 — — (3,845,568 ) (887,998 ) (1,703,068 ) — Less amortization of capitalized interest 59,491 8,123 — — — — — — — Total consolidated assets Ps. 2,111,214,442 1,091,199,512 373,086 23,633,373 179,130,478 8,666,192 23,414,240 132,925,292 2,202,326,329 Liabilities: By segment Ps. 2,307,044,263 1,304,436,598 692,443 13,318,729 26,070,184 2,998,974 1,870,963 68,454,797 3,287,511,886 Less unrealized intersegment sales — (4,419,930 ) — 497,567 — — — 305,387 — Total consolidated liabilities Ps. 2,307,044,263 1,300,016,668 692,443 13,816,296 26,070,184 2,998,974 1,870,963 68,760,184 3,287,511,886 As of the year Exploration and Industrial Cogeneration Drilling and Logistics Fertilizers Ethylene Trading Corporate and 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 of revalued assets (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

Revenue

Revenue	6 Months Ended
	Jun. 30, 2018
Text block1 [abstract]
Revenue	NOTE 6. REVENUE As of June 30, 2018 the revenues were as follows: a. Revenue disaggregation Exploration and Industrial Cogeneration Drilling Logistics Fertilizers Ethylene Trading Corporate and Total Geographical market 2018 United States 121,163,393 — — — — — — 77,333,272 — Ps. 198,496,665 Other 69,086,931 — — — — — — 17,841,577 — 86,928,508 Europe 45,439,141 — — — — — — 1,488,060 1,312,586 48,239,787 Local — 482,053,745 — 25,156 2,489,437 1,775,923 6,569,023 4,925,780 2,066,018 499,905,082 2017* United States 85,484,898 — — — — — — 66,122,954 — Ps. 151,607,852 Other 40,199,137 — — — — — — 12,567,251 — 52,766,388 Europe 28,436,524 — — — — — — 592,262 — 29,028,786 Local — 421,761,648 38,554 12,852 1,776,303 2,292,364 6,125,896 1,402,740 2,121,984 435,532,341 Major products and services 2018 Crude oil 235,689,465 — — — — — — — — Ps. 235,689,465 Gas — 54,742,573 — — — — — 22,737,680 — 77,480,253 Refined petroleum products — 425,632,977 — — — 1,773,975 6,563,445 77,151,280 — 511,121,677 Oher — 1,315,231 — — — — — 1,663,907 2,012,018 4,991,156 Services — 362,964 — 25,156 2,489,437 1,948 5,578 35,822 1,366,586 4,287,491 2017* Crude oil 154,120,559 — — — — — — 487,843 — Ps. 154,608,402 Gas — 60,040,711 — — — — — 20,650,874 — 80,691,585 Refined petroleum products – 357,357,083 – – – 2,290,876 6,112,537 57,644,187 – 423,404,683 Oher – 1,310,725 – – – – – 1,860,196 1,638,670 4,809,591 Services – 3,053,129 38,554 12,852 1,776,303 1,488 13,359 42,107 483,314 5,421,106 Timing of revenue recognition 2018 Products transferred at a point in time 235,689,465 482,053,745 – – – – – 101,552,867 2,012,018 Ps. 821,308,095 Products and services transferred over the time – – – 25,156 2,489,437 1,775,923 6,569,023 35,822 1,366,586 12,261,947 2017* Products transferred at a point in time 154,120,559 421,761,648 – – – 2,292,364 6,125,896 80,643,099 1,638,671 Ps. 666,582,237 Products and services transferred over the time – – 38,554 12,852 1,776,303 – – 42,108 483,313 2,353,130 * PEMEX applied modified retrospective transition method to the implementation of IFRS 15. Under this method the comparative financial information is not re–established. b. Practical expedients 1) Expiration of contracts. PEMEX does not need to disclose outstanding performance obligations due to their expiration within one year or less. 2) Significant financial component, less than one year. PEMEX does not need to adjust the amount committed in consideration to account for the effects of a significant financing component, since the transfer and the time of payment of a good or service committed to the customer is less than one year. 3) PEMEX applied the practical file, so disclosure about remaining performance obligations that conclude in less than one year is not needed. When PEMEX is entitled to consideration for an amount that directly corresponds to the value of the performance that Pemex has completed, it may recognize an income from ordinary activities for the amount to which it has the right to invoice.

Cash and Cash Equivalents

Cash and Cash Equivalents	6 Months Ended
	Jun. 30, 2018
Text block1 [abstract]
Cash and Cash Equivalents	NOTE 7. CASH AND CASH EQUIVALENTS As of June 30, 2018 and December 31, 2017, cash and cash equivalents were as follows: June 30, 2018 December 31, 2017 Cash on hand and in banks (i) Ps. 67,735,427 Ps. 55,871,127 Highly liquid investments (ii) 41,771,284 41,980,627 Ps. 109,506,711 Ps. 97,851,754 (i) Cash on hand and in banks is primarily composed of cash in banks. (ii) Mainly composed of short–term Mexican Government investments

Accounts Receivable, Net

Accounts Receivable, Net	6 Months Ended
	Jun. 30, 2018
Text block1 [abstract]
Accounts Receivable, Net	NOTE 8. ACCOUNTS RECEIVABLE, NET As of June 30, 2018 and December 31, 2017, accounts receivable and other receivables were as follows: June 30 , 2018 December 31, 2017 Domestic customers, net Ps. 55,402,470 Ps. 60,057,141 Export customers, net 56,626,963 54,428,883 Sundry debtors 44,402,034 26,105,703 Taxes to be recovered and prepaid taxes 7,539,947 23,039,023 Employees and officers 6,035,862 5,681,478 Advances to suppliers 867,742 1,250,846 Other accounts receivable 662,052 82,160 Ps. 171,537,070 Ps. 170,645,234

Inventories, Net

Inventories, Net	6 Months Ended
	Jun. 30, 2018
Text block1 [abstract]
Inventories, Net	NOTE 9. INVENTORIES, NET As of June 30, 2018 and December 31, 2017, inventories were as follows: June 30 2018 December 31, 2017 Refined and petrochemicals products Ps. 24,490,269 Ps. 27,862,384 Products in transit 13,589,457 19,112,606 Crude oil 9,602,571 11,445,780 Materials and products in stock 5,050,152 5,172,779 Materials in transit 492,262 180,711 Gas and condensate products 101,111 84,670 Ps. 53,325,822 Ps. 63,858,930

Equity Instruments

Equity Instruments	6 Months Ended
	Jun. 30, 2018
Text block1 [abstract]
Equity Instruments	NOTE 10. EQUITY INSTRUMENTS As of June 30, 2018, due to the adoption of IFRS 9, PEMEX classified its TAG Norte Holding, S. de R.L. de C.V. and TAG Pipeline Sur, S. de R.L. de C.V. shares of Ps. 1,056,968 as equity instruments. Before the initial application date of IFRS 9 (January 1, 2018), PEMEX classified these shares as available-for-sale As of June 30, 2018 and as of December 31, 2017, PEMEX was 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 were valued at their net realizable value, which, as of December 31, 2017, resulted in a negative value that has been recognized in the profit or loss at the end of the year. As of December 31, 2017, available-for-sale non-financial

Investments in Joint Ventures a

Investments in Joint Ventures and Associates	6 Months Ended
	Jun. 30, 2018
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 June 30, 2018 and December 31, 2017, were as follows: Percentage of June 30, 2018 December 31, 2017 Deer Park Refining Limited 49.99 % Ps.14,770,797 Ps. 14,405,542 Sierrita Gas Pipeline LLC 35.00 % 1,052,163 1,084,169 Frontera Brownsville, LLC. 50.00 % 485,543 471,085 CH 4 Energía, S.A. 50.00 % 142,121 315,713 Texas Frontera, LLC. 35.00 % 234,775 239,782 Administración Portuaria Integral de Dos Bocas, S.A. de C.V. 40.00 % 124,423 64,328 PMV Minera, S.A. de C.V. 44.09 % 49,057 45,133 Ductos el peninsular, S. A. P. I. de C. V. 30.00 % 17,783 18,336 Other, net Various 62,093 63,276 Ps. 16,938,755 Ps. 16,707,364 Profit (loss) sharing in joint ventures and associates: June 30, 2018 2017 Deer Park Refining Limited Ps. 375,671 Ps. 626,254 Petroquímica Mexicana de Vinilo, S. A. de C. V. (i) 291,739 92,089 Administración Portuaria Integral de Dos Bocas, S.A. de C.V. 60,095 30,869 Sierrita Pipeline, LLC. 56,422 54,820 PMV Minera, S.A. de C.V. 3,707 4,623 CH4 Energía S.A. de C.V. — 8,898 Other, net 60,502 57,401 Profit sharing in joint ventures and associates Ps. 848,136 Ps. 874,954 (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 damages, 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 full book value was written-off, Additional information about the significant investments in joint ventures and associates is presented below: • Deer Park Refining Limited • Petroqu í mica Mexicana de Vinilo, S.A. de C.V. Petroqu í mica Mexicana de Vinilo, S.A. de C.V. • Sierrita Gas Pipeline LLC. • Frontera Brownsville, LLC • Texas Frontera, LLC • Administración Portuaria Integral de Dos Bocas, S.A. de C.V. • PMV Minera, S.A. de C.V.

Wells, Pipelines, Properties, P

Wells, Pipelines, Properties, Plant and Equipment, Net	6 Months Ended
	Jun. 30, 2018
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 fixed assets Investment Balances as of January 1, 2017 Ps. 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 ) — (4,440,864 ) (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 — 118,652 3,155,845,995 Acquisitions 4,297,491 305,607 482,014 9,621,436 167,620 2,074,119 283,073 107,284 17,214,414 292,678 (106 ) — 34,845,630 Reclassifications 1,335,376 — (1,969,381 ) — (12,140 ) (4,039,499 ) (44,167 ) 20,915 600,671 12,119 2,707,617 (870 ) (1,389,359 ) Capitalization 272,222 — 1,140,129 7,538,411 99,766 — — 206,896 (9,257,424 ) — — — — Impairment 6,886,753 — (1,481,865 ) 30,832,289 (835,859 ) 7,310,570 — — (351,436 ) — — — 42,360,452 Disposals (3,242,791 ) (897,685 ) (426,983 ) (8,297,844 ) (242,061 ) — (407,078 ) (801,084 ) (258,407 ) (310,546 ) (2,707,511 ) — (17,591,990 ) Balances as of June 30, 2018 Ps. 765,574,411 22,851,038 479,612,090 1,307,442,202 63,877,797 318,775,131 50,889,480 22,705,647 137,684,200 44,540,950 — 117,782 3,214,070,728 Accumulated depreciation and amortization Balances as of January 1, 2017 Ps. (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 ) Depreciation and amortization (19,911,542 ) (1,078,808 ) (7,808,357 ) (35,229,793 ) (933,896 ) (6,877,975 ) (1,411,430 ) (481,914 ) — — — — (73,733,715 ) Reclassifications (244,470 ) — 224,869 — 19,614 1,344,469 65,719 (20,842 ) — — — — 1,389,359 Disposals 1,588,131 264,028 161,353 5,187,467 90,274 — 367,418 175,451 — — — — 7,834,122 Balances as of June 30, 2018 Ps. (412,592,028) (5,828,764 ) (167,381,549 ) (938,441,962 ) (41,865,017 ) (170,740,741 ) (39,951,231 ) (7,045,611 ) — — — — (1,783,846,903 ) Wells, pipelines, properties, plant and equipment net as of December 31,2017 Ps. 62,001,213 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 1,436,509,325 Wells, pipelines, properties, plant and equipment net as of June 30, 2018 Ps. 352,982,383 17,022,274 312,230,541 369,000,240 22,012,780 148,034,390 10,938,249 15,660,036 137,684,200 44,540,950 — 117,782 1,430,223,825 Depreciation rates 3 to 5 % 5 % 2 ti 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 June 30, 2018 and 2017, the financing costs identified with fixed assets in the construction or installation stage, capitalized as part of the value of such fixed assets, were Ps.1,033,422 and Ps.1,890,312. respectively. b. The combined depreciation of fixed assets and amortization of wells for the periods ended June 30, 2018 and 2017, recognized in operating costs and expenses, was Ps. 73,733,715, and Ps. 73,422,431, respectively, which includes costs related to plugging and abandonment of wells as of June 30, 2018 and 2017 of Ps. 528,541 and Ps. 419,869, respectively. c. As of June 30, 2018 and December 31, 2017, provisions relating to future plugging of wells costs amounted to Ps. 73,160,276 and Ps. 68,797,600, respectively, and are presented in the “Provisions for plugging of wells” (see Note 17). d. As of June 30, 2018, PEMEX recognized a reversal of impairment of Ps. 42,360,452. which is presented as a separate line item in the consolidated statement of comprehensive income as follows: (Impairment) Reversal of Reversal of Pemex Exploration and Production Ps. (1,459,374 ) Ps. 38,170,777 Ps. 36,711,403 Pemex Fertilizers (2,154,016 ) — (2,154,016 ) Pemex Industrial Transformation (11,529,001 ) 19,332,066 7,803,065 Total Ps. (15,142,391 ) Ps. 57,502,843 Ps. 42,360,452 Cash Generating Unit of Pemex Exploration and Production As of June 30, 2018, Pemex Exploration and Production recognized a net reversal of impairment in the amount of Ps. 36,711,403, integrated by a reversal of impairment from Ps. 38,170,777 mainly due to (i) an increase of 9.3% in the forward prices of crude oil, from U.S. $55.89 per barrel as of December 31, 2017 to U.S. $61.08 per barrel as of June 30, 2018, favoring the crude oil projects with the highest oil output, including the Aceite Terciario del Golfo, Cantarell; Tsimin Xux, Antonio J. Bermúdez, Crudo Ligero Marino and Cuenca de Macuspana projects and (ii) the reallocation of resources towards oil fields with highest profitability and net cash flows that contributed to more a more efficient distribution of goods and services, primarily in the Ku Maloob Zaap and Cantarell Project. The foregoing was offset by (i) an impairment of Ps. 1,459,374 in the Burgos and Lakach projects, mainly due to a 15.2% decrease in the price of gas, from 4.92 usd / mcf as of December 31, 2017 to 4.17 usd / mcf as of June 30, 2018 and (ii) a slight increase in the discount rate of 2%, with respect to the last quarter of 2017. 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 61.08 USD/bl Average gas price 4.17 USD/mpc Average condensates price 36.85 USD/bl Discount rate 14.72% anual The total forecast production, calculated with a horizon of 25 years is 6,625 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 June 30, 2018, Pemex Industrial Transformation recognized a reversal of impairment of Ps. 7,803,065. The reversal of impairment was in the following cash generating units: Minatitlán Refinery Ps. 10,851,186 Madero Refinery 8,480,880 Salina Cruz Refinery (11,529,001 ) Net reversal of impairment Ps. 7,803,065 The reversal of impairment was mainly due to (i) an increase in income related to transportation fees; (ii) the appreciation of the U.S. dollar against the peso, from a peso—U.S. dollar exchange rate of Ps. 19.7867 to U.S. $1.00 as of December 31, 2017 to a peso—U.S. dollar exchange rate of Ps. 19.8633 to U.S. $1.00 as of June 30, 2018; and (iii) an increase in the discount rate of cash generating units of refined products, gas and aromatics by 0.2%, 5% and 0.3%, respectively. The impairment of the Salina Cruz refinery resulted from cash flows being insufficient to cover the net value of the assets, mainly due to the temporary closing of operations for major maintenance of the refinery’s plants. 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 that 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 different statistic models that consider historical information of processes and the capacity of different 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 52.3 U.S. dollars N.A. N.A. Processed volume 1,100 mbd 3,085 mmpcd of Variable Rate of U.S. dollar Ps.19.8633 mxp/usd Ps.19.8633 mxp/usd Ps.19.8633 mxp/usd Useful lives of the cash generating units Average 14 years Average 8 years Average 7 years Discount rate 11.76% anually 10.82% anually 9.33% anually Period 2019-2034 2019-2029 2019-2024 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 June 30, 2018, the value in use for the impairment or reversal of impairment of fixed assets was as follows: Minatitlán Refinery Ps.41,290,257 Madero Refinery 20,843,922 Ps.62,134,179 Cash Generating Units of Pemex Fertilizers Cash generating units are plants used in the ammonia process. The recoverable amount of assets is based on each asset’s value in use. To determine cash flows, volumes to be produced and sales to be carried out were taken into consideration. The discount rate used was 9.33%. As of June 30, 2018, Pemex Fertilizers recognized an impairment of Ps. 2,154,016. The impairment is presented as a separate line item in the consolidated statement of comprehensive income.

Intangible Assets

Intangible Assets	6 Months Ended
	Jun. 30, 2018
Text block1 [abstract]
Intangible Assets	NOTE 13. INTANGIBLE ASSETS As of June 30, 2018 and December 31, 2017, intangible assets were Ps. 13,974,430 and Ps. 14,678,640, respectively, which are mainly wells unassigned to a reserve, which amounted, as follows: June 30, December 31, Wells unassigned to a reserve: Balance at the beginning of period Ps. 9,088,563 Ps. 8,639,242 Additions to construction in progress 9,810,680 20,553,952 Transfers against expenses (8,447,877 ) (3,663,986 ) Transfers against fixed assets (2,359,312 ) (16,440,645 ) Balance at the end of period Ps. 8,092,054 Ps. 9,088,563 In addition, as of June 30, 2018, June 30, 2017 and December 31, 2017, PEMEX recognized expenses related to unsuccessful wells of Ps. 606,244, Ps. 766,688 and Ps. 2,500,638, respectively, directly in its statement of comprehensive income. The other concepts of intangible assets are: June 30, 2018 December 31, Rights of way Ps. 2,350,847 Ps.2,311,743 License 3,791,955 3,586,553 Exploration expenses, evaluation of assets and concessoins 2,130,857 1,861,092 Accumulated amortization (2,391,283 ) (2,169,311 ) Balance at the end of period Ps.5,882,376 Ps. 5,590,077

Long-Term Notes Receivable and

Long-Term Notes Receivable and Other Assets	6 Months Ended
	Jun. 30, 2018
Text block1 [abstract]
Long-Term Notes Receivable and Other Assets	NOTE 14. LONG-TERM NOTES RECEIVABLE AND OTHER ASSETS a. Long-term notes receivable As of June 30, 2018 and December 31, 2017, the balance of long-term notes receivable was as follows: June 30, 2018 December 31, 2017 Promissory notes issued by the Mexican Government Ps. 148,338,390 Ps. 147,274,076 Other long-term notes receivable 1,022,386 1,218,833 Total long-term notes receivable Ps. 149,360,776 Ps. 148,492,909 Promissory notes issued by the Mexican Government June 30, 2018 December 31, 2017 Total promissory notes Ps. 152,010,092 Ps. 149,796,282 Less: current portion of notes receivable (1) 3,671,702 2,522,206 Long-term promissory notes Ps. 148,338,390 Ps. 147,274,076 (1) The current portion of the promissory notes and the total yield payments due 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 Federal 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. As of June 30, 2018 and December 31, 2017, these promissory notes amounted to Ps. 148,338,390 and Ps. 147,274,076, respectively. PEMEX intends 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% as follows: Number of Promissory Notes Maturity Yield Rate Range Principal 1 2019 5.14% Ps. 3,671,702 1 2020 5.39% 4,539,577 1 2021 5.57% 5,382,870 1 2022 5.74% 5,969,742 1 2023 5.87% 6,519,694 5 2024-2028 5.98% a 6.47% 36,001,121 5 2029-2033 6.61% a 6.85% 36,290,602 5 2034-2038 6.89% a 7.02% 33,018,175 4 2039-2042 7.00% a 6.94% 20,616,609 Total promissory notes 152,010,092 Less: current portion 3,671,702 Long-term notes receivable Ps. 148,338,390 From January to June 30, 2018 PEMEX recognized Ps. 4,764,834 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 b. Other assets As of June 30, 2018 and December 31, 2017, the balance of other assets was as follows: June 30, December 31, Payments in advance Ps. 3,328,576 Ps. 4,683,117 Other 7,987,986 1,211,984 Total other assets Ps. 11,316,562 Ps. 5,895,100

Debt

Debt	6 Months Ended
	Jun. 30, 2018
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Debt	NOTE 15. DEBT The Board of Directors approves the terms and conditions for the incurrence of obligations that constitute public debt of Petróleos Mexicanos for each fiscal year, in accordance with the Petróleos Mexicanos Law and the Reglamento de la Ley de Petróleos Mexicanos During the period from January 1 to June 30, 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 5.35% Notes due 2028 and (2) U.S. $1,500,000 6.35% Bonds due 2048. • 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. • On March 27, 2018, Petróleos Mexicanos entered into a credit line in the amount of U.S. $181,101, which bears interest at a rate linked to LIBOR plus 70 basis points, due February 2025 and was used on April 13, 2018. • On April 16, 2018, Petróleos Mexicanos increased its Medium-Term Notes Program, Series C, from U.S. $92,000,000 to U.S. $102,000,000. • On May 24, 2018, Petróleos Mexicanos issued €3,150,000 of debt securities under its U.S.$102,000,000 Medium Term Notes Program, Series C in four tranches: (i) €600,000 of its 2.500% Notes due on November 24, 2022; (ii) €650,000of its Floating Rate Notes due on August 24, 2023; (iii) €650,000 of its 3.625% Notes due on November 24, 2025; and (iv) €1,250,000 of its 4.750% Notes due on February 26, 2029. 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 and their respective successors and assignees. • On June 4, 2018, Petróleos Mexicanos issued CHF365,000 of its 1.750% Notes due 2023 under its U.S.$102,000,000 Medium Term Notes Program, Series C. 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 and their respective successors and assignees. 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 and all assignees and successors. • On June 26, 2018, Pro-Agroindustrias, From January 1 to June 30, 2018, PMI HBV (until July 31, 2018) and P.M.I. Holdings Holland Services, B.V., obtained U.S. $ 9,557,000 from its revolving credit line and repaid U.S. $9,757,000. As of December 31, 2017, the outstanding amount under this revolving credit line was U.S. $227,500. As of June 30, 2018, the outstanding amount under this revolving credit line was U.S. $27,500. As of June 30, 2018, Petróleos Mexicanos had U.S. $ 6,700,000 and Ps. 23,500,000 in available credit lines in order to ensure liquidity, which are available. Roll-forward of total debt of PEMEX for each of the period ended June 30, 2018 and 2017 are included in the Unaudited Condensed Consolidated Statements of Cash Flows in Financing activities. As of June 30, 2018, PEMEX used the following exchange rates: June 30, 2018 U.S. dollar 19.86330 Japanese yen 0.18002 Pound sterling 26.00901 Euro 23.00567 Swiss francs 19.92107 Australian dollar 14.61939

Financial Instruments

Financial Instruments	6 Months Ended
	Jun. 30, 2018
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Financial Instruments	NOTE 16. FINANCIAL INSTRUMENTS a. Accounting classifications and fair values of financial instruments The following tables present information about PEMEX’s carrying amounts and fair values of financial assets and financial liabilities, including their levels in the fair value hierarchy. It does not include fair value information for financial assets and financial liabilities not measured at fair value if the carrying amount is a reasonable approximation of fair value. Carrying amount Fair value hierarchy As of June 30, 2018 In thousands of pesos FVTPL FVOCI – debt FVOCI – Financial assets Other financial Total carrying Level 1 Level 2 Level 3 Total Financial assets measured at fair value Derivative financial instruments Ps. 27,141,083 — — — — Ps. 27,141,083 — 27,141,083 — 27,141,083 Equity instrument — — 1,056,918 — — 1,056,918 — 1,056,918 — 1,056,918 Ps. 27,141,083 — 1,056,918 — — Ps. 28,198,001 Financial assets not measured at fair value Cash and cash equivalents Ps. — — — 109,506,710 — Ps. 109,506,710 — — — — Accounts receivable — — — 171,537,070 — 171,537,070 — — — — Investments in joint ventures, associates — — — 16,938,755 — 16,938,755 — — — — Long-term notes receivable — — — 149,360,776 — 149,360,776 — — — — Ps. — — — 447,343,311 — Ps. 4 47,343,311 Financial liabilities measured at fair value Derivative financial instruments Ps. (14,958,973 ) — — — — Ps. (14,958,973 ) — (14,958,973 ) — (14,958,973 ) Ps. (14,958,973 ) — — — — Ps. (14,958,973 ) Financial liabilities not measured at fair value Suppliers Ps. — — — — (109,471,364 ) Ps. 109,471,364 ) — — — — Accounts payable — — — — (21,301,855 ) (21,301,855 ) — — — — Debt — — — — (2,070,332,329 ) (2,070,332,329 ) — (2,099,656,515 ) — (2,099,656,515 ) Ps. — — — — (2,201,105,548 ) Ps. (2,201,105,548 ) Carrying amount Fair value hierarchy As of December 31, 2017 In thousands of pesos FVTPL Held-to- Loans and Available- for-sale Other financial Total carrying Level 1 Level 2 Level 3 Total Financial assets measured at fair value Derivative financial instruments Ps. 30,113,454 — — — — Ps. 30,113,454 — 30,113,454 — 30,113,454 Investments in associates — — — 1,056,918 — 1,056,918 — 1,056,918 — 1,056,918 Ps. 30,113,454 — — 1,056,918 — Ps. 31,170,372 Financial assets not measured at fair value Cash and cash equivalents Ps. — — 97,851,754 — — Ps. 97,851,754 — — — — Accounts receivable — — 170,645,678 — — 170,645,678 — — — — Investments in joint ventures, associates — 16,707,364 — — — 16,707,364 — — — — Long-term notes receivable — 148,492,909 — — — 148,492,909 — — — — Ps. — 165,200,273 268,497,432 — — Ps. 433,697,705 Financial liabilities measured at fair value Derivative financial instruments Ps. (17,745,979) — — — — Ps. (17,745,979 ) — (17,745,979 ) — (17,745,979 ) Ps. (17,745,979) — — — — Ps. (17,745,979 ) Financial liabilities not measured at fair value Suppliers Ps. — — — — (139,955,378 ) Ps. (139,955,378 ) — — — — Accounts payable — — — — (23,211,845 ) (23,211,845 ) — — — — Debt — — — — (2,037,875,071 ) (2,037,875,071 ) — (2,153,383,220 ) — (2,153,383,220 ) Ps. — — — — (2,201,042,294 ) Ps. b. Fair value hierarchy PEMEX values the fair value of its financial instruments under standard methodologies commonly applied in the financial markets. PEMEX’s related assumptions therefore fall under the three Levels of the fair value hierarchy for market participant assumptions, as described below. The fair values determined by Level 1 inputs utilize quoted prices in active markets for identical assets or liabilities. Fair values determined by Level 2 inputs are based on quoted prices for similar assets or liabilities in active markets, and inputs other than quoted prices that are observed for assets or liabilities. Level 3 inputs are unobservable inputs for the assets or liabilities, and include situations where there is little, if any, market activity for the assets or liabilities. Management uses appropriate valuation techniques based on the available inputs to measure the fair values of PEMEX’s applicable assets and liabilities. When available, PEMEX measures fair value using Level 1 inputs, because they generally provide the most reliable evidence of fair value. c. Fair value of Derivative Financial Instruments (DFIs) PEMEX periodically evaluates its exposure to international hydrocarbon prices, interest rates and foreign currencies and uses derivative instruments as a mitigation mechanism when potential sources of market risk are identified. PEMEX monitors the fair value of its DFI portfolio on a periodic basis. The fair value represents the price at which one party would assume the rights and obligations of the other and is calculated for DFIs through models commonly used in the international financial markets, based on inputs obtained from major market information systems and price providers. Thereby PEMEX does not have an independent third party to value its DFIs. PEMEX calculates the fair value of its DFIs through the tools developed by its market information providers such as Bloomberg, and through valuation models implemented in software packages used to integrate all of PEMEX’s business areas and accounting, such as SAP (System Applications Products). PEMEX has no policies to designate a calculation or valuation agent. PEMEX’s DFI portfolio is composed of swaps and forwards, for which fair value is estimated by projecting future cashflows and discounting them with the corresponding discount factor; for currency options, this is done through the Black and Scholes Model, and for crude oil options, through the Levy model for Asian options. According to IFRS 13 “Fair Value Measurement”, the 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. PEMEX’s related assumptions and inputs fall under Level 2 of the fair value hierarchy for market participant assumptions. d. DFIs’ accounting treatment and impact in the financial statements PEMEX enters into derivatives transactions with the sole purpose of hedging financial risks related to its operations, firm commitments, planned transactions and assets and liabilities recorded on its statement of financial position. Nonetheless, some of these transactions do not qualify for hedge accounting treatment because they do not meet the requirements of the accounting standards for designation as hedges. They are therefore recorded in the financial statements as non-hedge As of June 30, 2018 and December 31, 2017, the net fair value of PEMEX’s DFIs (including both DFIs that have not reached maturity and those that have reached maturity but have not been settled), recognized in the consolidated statement of financial position, was Ps. 12,182,110 and Ps. 12,367,475, respectively. As of June 30, 2018 and December 31, 2017, PEMEX did not have any DFIs designated as hedges for accounting purposes. All of PEMEX’s DFIs are treated, for accounting purposes, as instruments entered into for trading purposes, therefore any change in their fair value, caused by any act or event, impacts directly in the “Derivative financial instruments (cost) income, net” line item. For the periods ended June 30, 2018 and 2017, PEMEX recognized a net (loss) gain of Ps. (9,292,906) and Ps. 20,332,885, respectively, in the “Derivative financial instruments (cost) income, net” line item with respect to DFIs treated as instruments entered into for trading purposes. In accordance with established policies, PEMEX has analyzed the different contracts it has entered into and has determined that according to the terms thereof, none meet the criteria necessary to be classified as embedded derivatives. Accordingly, as of June 30, 2018 and December 31, 2017, PEMEX did not recognize any embedded derivatives (foreign currency or index).

Provisions for Sundry Creditors

Provisions for Sundry Creditors	6 Months Ended
	Jun. 30, 2018
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Provisions for Sundry Creditors	NOTE 17. PROVISIONS FOR SUNDRY CREDITORS As of June 30, 2018 and December 31, 2017, the provisions for sundry creditors and others is as follows: June 30, 2018 December 31, 2017 Provision for plugging of wells (Note 12) Ps. 73,160,276 Ps. 68,797,600 Provision for trials in process (Note 18) 9,502,852 7,812,689 Provision for environmental costs 11,320,443 11,067,134 Ps. 93,983,571 Ps. 87,677,423

Contingencies

Contingencies	6 Months Ended
	Jun. 30, 2018
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Contingencies	NOTE 18. 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 financial statements. As of June 30, 2018, and December 31, 2017, PEMEX had accrued a reserve of Ps. 9,502,852, and Ps. 7,812,689, respectively, for these contingent liabilities. As of June 30, 2018, the current status of the principal lawsuits in which PEMEX is involved is as follows: • On April 4, 2011, Pemex-Exploration and Production was summoned before the Séptima Sala Regional Metropolitana Tribunal Federal de Justicia Fiscal y Administrativ 13620/15-17-06) Sexta Sala Regional Metropolitana • On June 11, 2015, the Segunda Sala Regional del Noreste 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-M é xico Segunda Secci ó n de la Sala Superior (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. On January 5, 2018 Pemex Exploration and Production filed a response to this claim. As of the date of these financial statements, the appointment of the Chairperson of arbitration trial is still pending. • On August 1, 2017, Pemex Exploration and Production was summoned in connection with an administrative claim (no. 11590/17-17-06-2) • In March 2018, Pemex Drilling and Services 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) 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 unaudited condensed consolidated interim 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.

Subsequent Events

Subsequent Events	6 Months Ended
	Jun. 30, 2018
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Subsequent Events	NOTE 19. SUBSEQUENT EVENTS As of October 8, 2018, the Mexican peso-U.S. As of October 8, 2018, the weighted average price of the crude oil exported by PEMEX was U.S. $76.55 per barrel. This represents a price increase of approximately 11.39% as compared to the average price as of June 30, 2018, which was U.S. $68.72 per barrel. During the period from July 1 to October 8, 2018, PMI HBV(until July 31, 2018) and P.M.I Holdings Holland Services, B.V., obtained U.S. $5,668,000 billion in financing from its revolving credit lines and repaid U.S. $5,608,000 billion. The outstanding amount under these revolving credit lines was U.S. $87,500, million as of October 8, 2018. On July 6, 2018, PEMEX announced that it had reached an agreement to sell its 44.09% stake in PMV to Mexichem. PEMEX’s divestiture from this joint venture was motivated by the decision of the Board of Directors of PMV not to rebuild PMV’s vinyl chloride plant, which suffered an accident on April 20, 2016. The aggregate value of this transaction is approximately Ps. 3,436 million; the transaction also involves the reintegration into PEMEX of the vinyl chloride monomer plants and related infrastructure at the Pajaritos petrochemical complex. On July 13, 2018, the Board of Directors of Petróleos Mexicanos issued the Declaratoria de Liquidaci ó n y Extinci ó n de Pemex Cogeneraci ó n y Servicios On September 4 and 5 PEMEX received the payment for the sale of its 5% interest in TAG Norte Holding, S. de R.L. de C.V., which as of June 30, 2018 was recorded as equity instruments (see Note 10) for U.S.$43,036.8 (Ps. 826,046.5) obtaining a net profit of Ps.10,257.

Significant Accounting Polici_2

Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2018
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Basis of consolidation	a. Basis of consolidation The unaudited condensed consolidated interim 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 unaudited condensed consolidated interim financial statements pursuant to IFRS 10, “Consolidated Financial Statements” (“IFRS10”). 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. 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’ unaudited condensed consolidated interim 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. The unaudited condensed consolidated interim financial statements include the proportion of gains and losses 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 unaudited condensed consolidated interim statements of financial position, the unaudited condensed consolidated interim 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
Transactions in foreign currency	b. 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	c. 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	d. Financial instruments Policy applicable in 2018 and 2017 i. Recognition and initial measurement Trade receivables and debt securities issued are initially recognized when they are originated. All other financial assets and financial liabilities are initially recognized when PEMEX becomes a party to the contractual provisions of the instrument. A financial asset (unless it is a trade receivable without a significant financing component) or financial liability is initially measured at fair value plus, for an item not at FVTPL (as defined below), transaction costs that are directly attributable to its acquisition or issue. A trade receivable without a significant financing component is initially measured at the transaction price. Policy applicable from January 1, 2018 ii. Classification and subsequent measurement Financial Assets On initial recognition, a financial asset is classified as measured at: Amortized Cost; Fair Value Through Other Comprehensive Income (“FVTOCI”)-debt investment; FVTOCI-equity investment; or Fair Value Through Profit and Losses (“FVTPL”). Financial assets are not reclassified subsequent to their initial recognition unless PEMEX changes its business model for managing financial assets, in which case all affected financial assets are reclassified on the first day of the first reporting period following the change in the business model. A financial asset is measured at amortized cost if it meets both of the following conditions and is not designated as at FVTPL: • it is held within a business model whose objective is to hold assets to collect contractual cash flows; and • its contractual terms give rise on specified dates to cash flows that are solely payments of principal and interest on the principal amount outstanding. A debt instrument is measured at FVTOCI only if it meets both of the following conditions and is not designated as at FVTPL: • it is held within a business model whose objective is achieved by both collecting contractual cash flows and selling financial assets; and • its contractual terms give rise on specified dates to cash flows that are solely payments of principal and interest on the principal amount outstanding. On initial recognition of an equity investment that is not held for trading, PEMEX may irrevocably elect to present subsequent changes in fair value in OCI. This election is made on an investment-by-investment All financial assets not classified as measured at amortized cost or FVOCI (as described above) are measured at FVTPL. This includes all derivative financial assets (see Note 16). On initial recognition, PEMEX may irrevocably designate a financial asset that otherwise meets the requirements to be measured at amortized cost or at FVOCI as FVTPL, if doing so eliminates or significantly reduces an accounting mismatch that would otherwise arise. Policy applicable from January 1, 2018 Financial assets - Business model assessment PEMEX makes an assessment of the objective of the business model in which a financial asset is held at a portfolio level because this best reflects the way the business is managed and information is provided to management. The information considered includes: • the stated policies and objectives for the portfolio and the operation of those policies in practice, which include whether management’s strategy focuses on earning contractual interest income, maintaining a particular interest rate profile, matching the duration of the financial assets to the duration of any related liabilities or expected cash outflows or realizing cash flows through the sale of the assets; • how the performance of the portfolio is evaluated and reported to PEMEX management; • the risk that affects the performance of the business model (and the financial assets held within that business model) and how those risks are managed; • how managers of the business are compensated (e.g., whether compensation is based on the fair value of the assets, managed or the contractual cash flows collected), and • the frequency, volume and timing of sales in prior periods, the reasons for such sales and its expectations about future sales activity. Transfers of financial assets to third parties in transactions that do not qualify for derecognition are not considered sales for this purpose, consistent with PEMEX’s continuing recognition of the assets. Financial assets that are held for trading or managed and whose performance is evaluated on a fair value basis are measured at FVTPL. Policy applicable from January 1, 2018 Financial Asset - Assessment whether contractual cash flows are solely payments of principal and interest. For the purposes of this assessment, principal is defined as the fair value of the financial assets on initial recognition. Interest is defined as consideration for the time value of money and for the credit risk associated with the principal amount outstanding during period of time and for the basic lending risks and costs (e.g., liquidity risk and administrative costs), as well as profit margin. In assessing whether the contractual cash flows are solely payments of principal and interest, PEMEX considers the contractual terms of the instrument, which includes assessing whether the financial asset contains a contractual term that could change the timing or amount of contractual cash flows such that it would not meet this condition. In making this assessment, PEMEX considers: • contingent events that would change the amount or timing of cash flows; • terms that may adjust the contractual coupon rate, including variable rate features; • prepayment and extension features; and • terms that limit PEMEX’s claim to cash flows from specified assets (for example, non-recourse A prepayment feature is consistent solely with the payments of principal and interest criterion if the prepayment amount substantially represents unpaid amounts of principal and interest on the principal amount outstanding, which may include reasonable additional compensation for early termination of the contract. Additionally, for a financial asset acquired at a significant discount or premium to its contractual par amount, a feature that permits or requires prepayment at an amount that substantially represents the contractual par amount plus accrued (but unpaid) contractual interest (which may also include reasonable additional compensation for early termination) is treated as consistent with this criterion if the fair value of the prepayment feature is insignificant at initial recognition. Policy applicable from January 1, 2018 Financial assets – Subsequent measurement and gain and losses Financial assets at FVTPL Financial assets at FVTPL are measured at fair value and changes therein, including any interest or dividend income, are recognized in profit or loss. Financial assets at amortized cost These assets are subsequently measured at amortized cost using the effective interest method. The amortized cost is reduced by impairment losses. Interest income, foreign exchange gains and losses and impairment are recognized in profit or loss. Any gain or loss on derecognition is recognized in profit or loss. Debt investments at FVOCI These assets are subsequently measured at fair value. Interest income calculated using the effective interest method, foreign exchange gains and losses and impairment are recognized in profit or loss. Other net gains and losses are recognized in OCI. On derecognition, gains and losses accumulated in OCI are reclassified to profit or loss. Equity investments at FVOCI These assets are subsequently measured at fair value. Dividends are recognized as income in profit or loss unless the dividend clearly represents a recovery of part of the cost of the investment. Other net gains and losses are recognized in OCI and are never reclassified to profit or loss. Policy applicable before January 1, 2018 Financial assets 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 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. Policy applicable in 2018 and 2017 Derivative financial instruments DFIs presented in the consolidated statements of financial position were valued at fair value. In the case of DFIs held for trading, changes in fair value were taken directly to profit or loss for the period; in the case of DFIs formally designated as and that qualify for hedging, they are accounted for the following the fair value or cash flow hedge accounting model. 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. Financial liabilities: Classification, subsequent measurement and gains and losses Financial liabilities are classified as measured at amortized cost or FVTPL. A financial liability is classified as FVTPL if it is classified as held-for-trading, iii. Derecognition Financial assets PEMEX derecognizes a financial asset when the contractual rights to the cash flows from the financial asset expire, or it transfers the rights to receive the contractual cash flows in a transaction in which substantially all of the risks and rewards of ownership of the financial asset are transferred or in which PEMEX neither transfers nor retains substantially all of the risks and rewards of ownership and it does not retain control of the financial asset. PEMEX enters into transactions whereby it transfers assets recognized in its statement of financial position, but retains either all or substantially all of the risks and rewards of the transferred assets. In these cases, the transferred assets are not derecognized. Financial liabilities PEMEX derecognizes a financial liability when its contractual obligations are discharged or cancelled, or expire. PEMEX also derecognizes a financial liability when its terms are modified and the cash flows of the modified liability are substantially different, in which case a new financial liability based on the modified terms is recognized at fair value. On derecognition of a financial liability, the difference between the carrying amount extinguished and the consideration paid (including any non-cash iv. Offsetting Financial assets and financial liabilities are offset and the net amount is presented in the statement of financial position when, and only when, PEMEX currently has a legally enforceable right to set off the amounts and it intends either to settle them on a net basis or to realize the asset and settle the liability simultaneously. v. Derivative financial instruments and hedge accounting PEMEX holds derivative financial instruments to hedge its foreign currency and interest rate risk exposures. Embedded derivatives are separated from the host contract and accounted for separately if the host contract is not a financial asset and certain criteria are met. Derivatives are initially measured at fair value. Subsequent to initial recognition, derivatives are measured at fair value, and changes therein are generally recognized in profit or loss. PEMEX uses derivative financial instruments to hedge the risk exposure in foreign currency, interest rate and the price of its products. However, these contracts are not accounted as designated hedges. DFIs are initially recognized at fair value on the date on which a derivative contract is entered into and after initial recognition are measured again at fair value. Derivatives are accounted for as financial assets when the fair value is positive and as a financial liability when the fair value is negative. Any gain or loss arising from changes in the fair value of the derivatives is recognized directly in the income statement. Policy applicable from January 1, 2018 vi. Impairment Financial instruments and contract assets PEMEX recognizes loss allowances for Estimated Credit Losses (“ECLs”) on: • financial assets measured at amortized cost; • debt investments measured at FVOCI; and • contract assets (as defined in IFRS 15). PEMEX measures loss allowances at an amount equal to lifetime ECL, except for the following, which are measured as 12-month • debt securities that are determined to have low credit risk at the reporting date; and • other debt securities and bank balances for which credit risk (i.e. the risk of default occurring over the expected life of the financial instrument) has not increased significantly since initial recognition. Loss allowances for trade receivables and contract assets are always measured at an amount equal to lifetime ECL. When determining whether the credit risk of a financial asset has increased significantly since initial recognition and when estimating ECL, PEMEX considers reasonable and supportable information that is relevant and available without undue cost or effort. This includes both quantitative and qualitative information and analysis, based on PEMEX’s historical experience and informed credit assessment which includes forward-looking information. PEMEX assumes that the credit risk on a financial asset has increased significantly if it does not comply with the terms established in the contract. PEMEX considers a financial asset to be in default when the borrower is unlikely to pay its credit obligations to PEMEX in full, without recourse by PEMEX to actions such as realizing security (if any is held). PEMEX considers that a debt instrument has a low credit risk, when its credit rating is classified as ‘investment grade’. The investment grade classification is based on minimum credit ratings of Baa3 (Moody’s) and BBB- Lifetime ECLs are the ECLs that result from all possible default events over the expected life of a financial instrument. 12-month The maximum period considered when estimating ECLs is the maximum contractual period over which PEMEX is exposed to credit risk. Measurement of ECLs ECLs are a probability-weighted estimate of credit losses. Credit losses are measured as the present value of all cash shortfalls (for example, the difference between the cash flows due to the entity in accordance with the contract and the cash flows that PEMEX expects to receive). ECLs are discounted at the effective interest rate of the financial asset. Credit-impaired financial assets At each reporting date, PEMEX assesses whether financial assets carried at amortized cost and debt securities at FVOCI are credit-impaired. A financial asset is ‘credit-impaired’ when one or more events that have a detrimental impact on the estimated future cash flows of the financial asset have occurred. Evidence that a financial asset is credit-impaired includes the following observable data: • significant financial difficulty of the borrower or issuer; • a breach of contract such as a default or being more than 90 days past due; • the restructuring of a loan or advance by PEMEX on terms that it would not consider otherwise; • it is probable that the borrower will enter bankruptcy or other financial reorganization; or • the disappearance of an active market for a security because of financial difficulties. Presentation of allowance for ECL in the unaudited condensed consolidated interim statement of financial position Loss allowances for financial assets measured at amortized cost are deducted from the gross carrying amount of the assets. For debt securities at FVOCI, the loss allowance is charged to profit or loss and is recognized in OCI. Write-off The gross carrying amount of a financial asset is written off (either partially or in full) to the extent that there is no realistic prospect of recovery. This is generally the case when PEMEX determines that the debtor does not have assets or sources of income that could generate sufficient cash flows to repay the amounts subject to the write-off. Policy applicable before January 1, 2018 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 OCI 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 OCI.
Inventories and cost of sales	e. 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	f. 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 reitions 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	g. Crude oil and natural gas reserves Under Mexican law, all crude oil and other hydrocarbon reserves located in the subsoil of Mexico are owned by the Mexican nation and not by PEMEX. In accordance with the aforementioned and based on the applicable regulation as of the date of these unaudited condensed consolidated interim 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)”) Auditing of Oil and Gas Reserves Information promulgated by the Society of Petroleum Engineers (the “SPE”) as of February 19, 2007. These procedures are consistent with international reserves reporting practice. The estimation of these reserves depends on assumptions made and the interpretation of the data available, and may vary among analysts. The results of drilling activities, test wells and production after the date of estimation are utilized in future revisions of reserves estimates. Although PEMEX does not own the oil and other hydrocarbon reserves within Mexico, these procedures allow PEMEX to record the effects that such oil and other hydrocarbon reserves have on its consolidated financial statements, including, for example, in the depreciation and amortization line item.
Impairment of non-financial assets	h. Impairment of non-financial The carrying amounts of PEMEX’s non-financial A cash-generating unit is the smallest identifiable group of assets which can generate cash flows independently from other assets or groups of assets. The recoverable amount of an asset or a cash-generating unit 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 unaudited condensed consolidated interim statement of comprehensive income.
Leases	i. 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 unaudited condensed consolidated interim statement of comprehensive income. Operating lease payments are recognized as expenses in the unaudited condensed consolidated interim 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	j. 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	k. Employee benefits Beginning January 1, 2016, Petróleos Mexicanos and the Subsidiary Entities operate both a defined contribution plan and 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. The obligations and costs of the defined benefit plan recognized in the interim periods are based on the actuarial calculation of the previous year. Termination benefits are recognized in profit or loss for the year in which they are incurred.
Income taxes and duties	l. 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 reporting period. Current income taxes related with items that are recognized as equity are presented in the OCI 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 unaudited condensed consolidated interim 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 OCI. 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. Royalties Royalties are payable pursuant to license agreements. These royalties are recognized as liabilities and affect the items of costs and expenses related to the operations that gave rise to them.
Contingencies	m. Contingencies Contingency losses are recorded when it is probable that a liability has been incurred and the amount thereof can be reasonably estimated. When a reasonable estimation cannot be made, qualitative disclosure is provided in the notes to the consolidated financial statements. Contingent revenues, earnings or assets are not recognized until realization is assured.
Revenue recognition	n. Revenue recognition Revenue is measured based on the consideration specified in a contract with a customer and excludes amounts collected on behalf of third parties. PEMEX recognizes revenue when it transfers control over a product or service to a costumer (see Note 6). Before January 1, 2018, revenue was measured at the fair value of the consideration received or receivable. Revenue from the sale of goods was recognized when the significant risks and rewards of ownership had been transferred to the customer, recovery of the consideration was probable, the associated costs and possible return of goods could be estimated reliably, there was no continuing management involvement with the goods and the amount of revenue could be measured reliably. Revenue from rendering of services was recognized in proportion to the stage of completion of the work performed at the reporting date, which was determined based on surveys.
Presentation of consolidated statements of comprehensive income	o. Presentation of consolidated statements of comprehensive income Revenue, costs and expenses shown in PEMEX’s unaudited condensed consolidated interim 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. When calculating interest income and expenses, the effective interest rate is applied to the gross carrying amount of the asset (when the asset has no credit impairment) or to the amortized cost of the liability. However, financial assets with credit impairment after initial recognition, interest income is calculated by applying the effective interest rate at the amortized cost of the financial asset. If the asset ceases to be impaired, the interest income calculation returns to the gross base.
Operating segments	p. 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	q. 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	r Accounting changes As of January 1, 2018, PEMEX adopted IFRS 15 “Revenue from Contracts with Customers” (“IFRS 15”) and IFRS 9 “Financial Instruments” (“IFRS 9” (2014)). There have been changes in other IFRS that are effective as of January 1, 2018, but these changes do not have a material effect on these unaudited condensed consolidated interim financial statements. • IFRS 15 IFRS 15 establishes a comprehensive framework for determining whether, how much and when revenue is recognized. It replaces existing revenue recognition guidance, including IAS 18 Revenue, IAS 11 Construction Contracts, IFRIC 13 Customer Loyalty Programs and IFRIC 15 Agreements for the Construction of Real Estate. PEMEX adopted IFRS 15 with the retrospectively cumulative transition method at January 1, 2018. Under this transition method, comparative information has not been restated and it is presented under IAS 18 and IAS 11. As of January 1, 2018, no significant uncompleted contracts were identified, so there was no impact on the unaudited condensed consolidated interim financial statements due to the initial adoption of the standard. Under IFRS 15, revenue is measured based on the consideration specified in a contract with a customer and excludes amounts collected on behalf of third parties. PEMEX recognizes revenue when it transfers control over a product or service to a costumer. In the case of comparative periods, revenue was measured at the fair value of the consideration received or receivable. Revenue from the sale of goods was recognized when the significant risks and rewards of ownership had been transferred to the customer, recovery of the consideration was probable, the associated costs and possible return of goods could be estimated reliably. Revenue from rendering of services was recognized in proportion to the stage of completion of the work performed at the reporting date. The details of the main impacts generated by the adoption of IFRS 15 are the following: a. Nature of revenues of products and services The following is a description of the nature, deliver timing, significant payment clauses of PEMEX’s main revenues. For more information see Note 6, Revenue. • Crude oil sales Nature, performance obligations and timing of revenue recognition Domestic and export sales of crude oil in national and international market are approximately 50% of each market. All sales are performed by the Free on Board International commercial term (“FOB” Incoterm); Therefore, transportation fees can be included in the price of sale of the product but are considered part of a single performance obligation since transportation is rendered before control is transferred. In the case of sales to the international market, revenue is recognized at a point in time when control of the crude oil has transferred to the customer, which occurs when the product is delivered at the shipping point. Determination and allocation of the transaction price The price of the product is determined based on a market components formula and with respect to the crude oil sold and in accordance with the provisions of the Hydrocarbon Trading Strategies Management. For international market crude oil sales, revenue is recognized with a provisional price, which undergoes subsequent adjustments until the product has arrived at the destination port. In some cases, there may be a period of up to 2 months in determining the final sale price, when it comes to sales to the European market, the Middle East and Asia. Crude oil sale contracts consider possible customer’s claims due to product quality, volume or delays in boarding, which are estimated in the price of the transaction. Therefore, due to the implementation of IFRS 15, the main impacts on revenue recognition with respect to the previous year are as follows: IFRS 15 IAS 18 For orders that have variations in price, revenue is adjusted on the closing date of each period. The subsequent variations in the fair value at the different reporting dates are recognized according to IFRS 9 For orders that have variations in price, revenue was adjusted upon the product’s arrival at its final destination and the final price is defined. Revenue is measured initially estimating the variable compensations such as quality and volume claims, delays in boarding etc. A decrease in revenue was recognized when quality and volume claims, or other variable compensations were known. • Sale of Petroleum products Nature, performance obligations and timing of revenue recognition Refined products and their derivatives are sold within the national market. The Comisión Federal de Electricidad Revenue is recognized at a point in time when control is transferred to the customer, which occurs either at the point of shipping or when it is delivered at the customer’s facilities. Therefore, transportation fees can be included in the price of sale of the product but are considered part of a single performance obligation since transportation is rendered before control is transferred. Determination and allocation of the transaction price The price is determined based on the price at the point of delivery, adding the price of the services rendered (freight, handling of jet fuel, etc.) with the provisions and terms established by the Energy Regulatory Commission (ERC). There are penalties for delivery failures and/or payment obligations, as well as quality and volume claims, which are known days after the transaction. Therefore, due to the implementation of IFRS 15, the main impacts on revenue recognition with respect to the previous year are as follows: IFRS 15 IAS 18 For all petroleum products, there is only one performance obligation that includes transport and handling services to the point of delivery. Transportation and handling services were recognized as a separate service income, on the basis of prices established in the service orders. However, service income was also recognized at the point of delivery. Revenue is measured initially estimating the variable compensations such as quality and volume claims, etc. A decrease in revenue was recognized at the time quality and volume claims, or other variable compensations were known. • Sales of natural gas The sale of natural gas, liquefied petroleum gas, naphtha, butane, ethane and some other petrochemicals such as methane derivatives, ethane derivatives, aromatics and derivatives are mainly carried out in the domestic market. Revenue is recognized at a point in time when control is transferred to the customer, which occurs when it is delivered at the customer’s facilities. Therefore, transportation fees can be included in the price of sale of the product but are considered part of a single performance obligation since transportation is rendered before control is transferred. Determination and allocation of the transaction price The transaction price is established at the time of sale, including the estimation of variable considerations such as capacity, penalties, extraordinary sales not included in contracts, adjustments for quality or volume claims, and incentives for the purchase of products; which are known days after the transaction. Therefore, due to the implementation of IFRS 15, the main impacts on revenue recognition with respect to the previous year are as follows: IFRS 15 IAS 18 There is only one performance obligation that includes transport and handling services to the point of delivery. Natural gas supply, transportation and fuel capacity were considered as performance obligations. Sales of natural gas were recorded as sale of products while the amount charged to customers for transportation and fuel capacity was recognized as other revenue at the point of delivery. Revenue is measured initially estimating the variable compensations as quality and volume claims, etc. A decrease in revenue was recognized at the time quality and volume claims, or other variable compensations were known • IFRS 9 In July 2014, the IASB finalized the accounting reform of financial instruments and issued IFRS 9, 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 replaces IAS 39 Financial Instruments: Recognition and Measurement as of its effective date. PEMEX has adopted IFRS 9 Financial Instruments issued in July 2014 with a date of initial application of January 1, 2018. The requirements of IFRS 9 represent a significant change from IAS 39 Financial Instruments: Recognition and Measurement. The nature and effects of the key changes to PEMEX’s accounting policies resulting from its adoption of IFRS 9 are summarized below. As a result of the adoption of IFRS 9, PEMEX adopted consequential amendments to IAS 1 Presentation of Financial Statements, which requires impairment of financial assets to be presented in a separate line item in the statement of profit or loss and OCI. Previously, PEMEX’s approach was to include the impairment of trade receivables in other expenses. • Classification of financial assets and financial liabilities IFRS 9 contains three principal classification categories for financial assets: measured at amortized cost, FVOCI and FVTPL. The classification of financial assets under IFRS 9 is generally based on the business model in which a financial asset is managed and its contractual cash flow characteristics. IFRS 9 eliminates the previous IAS 39 categories of trading, held to maturity, loans and receivables and available for sale. Under IFRS 9, derivatives embedded in contracts where the host is a financial asset in the scope of the standard are never separated. Instead, the hybrid financial instrument as a whole is assessed for classification. For an explanation of how PEMEX classifies and measures financial assets and accounts for related gains and losses under IFRS 9, see Note 16. With respect to financial liabilities, the current classification and measurement criteria under IAS 39 have been transferred to IFRS 9, including the criteria for using the fair value option. The only change contemplated by IFRS 9 in relation to financial liabilities is related to liabilities designated at FVTPL. Changes in the fair value of such financial liabilities attributable to changes in the entity’s own credit risk will be presented in OCI instead of in the period’s results. The adoption of IFRS 9 has not had a significant effect on PEMEX’s accounting policies for financial liabilities. • Impairment of financial assets IFRS 9 replaces the “incurred loss” model in IAS 39 with an “expected credit loss” (ECL) model. The new impairment model applies to financial assets measured at amortized cost, contract assets and debt investments at FVOCI, but not to investments in equity instruments. Under IFRS 9, credit losses are recognized earlier than under IAS 39. • Hedge accounting PEMEX, as part of the initial adoption, selected accounting policy to continue applying the hedge accounting requirements of IAS 39, instead of those included in IFRS 9. PEMEX uses derivative financial instruments to hedge the risk exposure in foreign currency, interest rate and the price of its products. However, these contracts are not accounted as designated hedging instruments. Derivative financial instruments are initially recognized at fair value on the date on which a derivative contract is entered into and after initial recognition are measured again at fair value. Derivatives are accounted for as financial assets when the fair value is positive and as a financial liability when the fair value is negative. Any gain or loss arising from changes in the fair value of the derivatives is recognized directly in the income statement. This policy applies to the comparative information presented in 2018 and 2017. • Transition 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. As a result of the adoption of IFRS 9 and based on compliance with the Classification and Measurement requirements, PEMEX concluded that its financial assets will continue to be recognized in the current category as follows:: Classification Assets IFRS 9 Change Cash and equivalents Loans and FVTPL No Account receivables short term – net Loans and Amortized No Equity instruments Financial assets FVTOCI No Derivative financial instrument FVTPL FVTPL No Account receivables long term – net Loans and Amortized No 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 was made using the general approach for calculating impairment of the notes was made using the general approach for calculating impairment contemplated under IFRS 9. The evaluation does not have material effects. 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. PEMEX considers that the application of the impairment requirements of IFRS 9 as of December 31, 2017 did not significantly impact the reserves as of January 1, 2018. The adjustment as of January 1, 2018 of the reserves of financial assets in comparison with impairment losses incurred under IAS 39 was approximately Ps. 24,957.
New accounting policies not yet adopted	s. New IFRS not yet adopted The IASB issued amendments and new IFRS that are not effective as of the issuance date of these unaudited condensed consolidated interim financial statements but could have effect in subsequent PEMEX’s financial information. The new standards will be 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 unaudited condensed consolidated interim 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) 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, when 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 do not anticipate being impacted by IFRIC 23 because all tax positions are discussed and agreed with SHCP prior to releasing quarterly or annual financial statements. c) 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 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 acquiring 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, OCI or equity basis). • IAS 23 Borrowing Costs With respect to the treatment of costs for loans subject to capitalization: • 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.

Significant Accounting Polici_3

Significant Accounting Policies (Tables)	6 Months Ended
	Jun. 30, 2018
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Summary of Reclassification of Other Assets to Intangible Assets	In order to provide a better presentation in other assets the following amounts in the consolidated financial statements as of December 31, 2017 were reclassified to intangible assets, as follows: 2017 Line item As previously Reclassification Following Intangible assets Ps. 9,088,563 Ps. 5,590,077 Ps. 14,678,640 Other assets 11,485,177 (5,590,077 ) 5,895,100

Segment Financial Information (

Segment Financial Information (Tables)	6 Months Ended
	Jun. 30, 2018
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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 six month Exploration Industrial Cogeneration Drilling Logistics Fertilizers Ethylene Trading Corporate Intersegment Total Sales: Trade 235,689,465 481,690,782 — — — 1,773,974 6,563,445 101,552,868 2,012,018 — 829,282,552 Intersegment 213,902,695 85,736,578 — 2,212,873 32,019,150 1,046,387 704,832 323,999,851 48,776,165 (708,398,531 ) — Services income — 362,963 — 25,156 2,489,437 1,948 5,578 35,821 1,366,587 — 4,287,490 (Reversal) impairment of wells pipe-lines, properties, plant and equipment (36,711,403 ) (7,803,065 ) — — — 2,154,016 — — — — (42,360,452 ) Cost of sales 210,101,903 563,862,842 — 1,060,852 20,167,802 3,411,785 7,353,302 417,171,921 24,906,788 (667,061,674 ) 580,975,521 Gross income (loss) 276,201,660 11,730,546 — 1,177,177 14,340,785 (2,743,492 ) (79,447 ) 8,416,619 27,247,982 (41,336,857 ) 294,954,973 Other revenues (expenses), net 4,101,924 3,348,024 1,788 (1,932,918 ) (14,265,893 ) 25,831 67,732 447,308 1,520,399 14,409,860 7,724,055 Distribution, transportation and sales expenses 124,828 12,392,562 — 63 15,382 179,403 82,391 232,858 37,459 (1,990,895 ) 11,074,051 Administrative expenses 27,360,806 21,236,183 — 352,138 4,550,764 242,689 626,410 916,991 34,198,389 (25,158,088 ) 64,326,282 Operating income (loss) 252,817,950 (18,550,175 ) 1,788 (1,107,942 ) (4,491,254 ) (3,139,753 ) (720,516 ) 7,714,078 (5,467,467 ) 221,986 227,278,695 Financing income 42,975,869 4,867,481 1 142,575 612,787 2,818 11,729 370,485 70,368,989 (108,383,165 ) 10,969,569 Financing cost (59,110,719 ) (973,317 ) — (381,390 ) (144,266 ) (189,543 ) (25,559 ) (732,894 ) (103,576,300 ) 108,161,171 (56,972,817 ) Derivative financial instruments (loss) gain, net (9,682,793 ) (20,907 ) — — — — — (1,661,925 ) 2,072,712 7 (9,292,906 ) Foreign exchange (loss) income, net 8,727,059 (1,599,203 ) — (34,203 ) (98,860 ) (10,478 ) (10,478 ) 265,227 (4,733,747 ) — 2,505,317 (Loss) profit sharing in associates 60,095 — — — (553 ) — — 432,093 (5,268,146 ) 5,624,647 848,136 Taxes, duties and other 226,543,089 — — (411,178 ) (6,126,518 ) — — 3,865,394 1,325,602 — 225,196,389 Net (loss) income 9,244,372 (16,276,121 ) 1,789 (969,782 ) 2,004,372 (3,336,956 ) (744,824 ) 2,521,670 (47,929,561 ) 5,624,646 (49,860,395 ) Total current assets 1,092,665,803 228,874,626 — 8,774,048 31,284,758 1,963,988 4,276,184 148,590,483 536,016,409 (1,689,878,695 ) 362,567,604 Investments in joint ventures and associates 124,423 4 — — 17,783 — — 15,965,142 (466,946,467 ) 467,777,870 16,938,755 Wells, pipelines, properties, plant and equipment, net 943,299,127 289,594,157 — 17,478,212 117,402,968 3,659,202 18,479,853 6,763,729 33,546,577 — 1,430,223,825 Total assets 2,109,752,502 519,391,505 — 27,119,590 179,211,676 5,675,237 22,917,849 177,847,795 2,159,248,411 (3,068,456,971 ) 2,132,707,594 Total current liabilities 292,778,523 126,822,276 — 2,924,666 29,530,499 6,531,365 2,703,176 100,825,821 1,491,499,353 (1,682,597,620 ) 371,018,059 Long-term debt 1,849,958,235 21,262,169 — 10,814,834 2,438,389 — — 2,344,152 1,862,043,745 (1,845,631,186 ) 1,903,230,338 Employee benefits 380,688,849 603,048,228 — 349,713 1,952,532 105,605 111,353 (930,408 ) 302,582,070 — 1,287,907,942 Total liabilities 2,613,361,506 755,563,795 — 15,587,610 40,684,421 6,640,994 2,846,006 105,534,647 3,675,558,718 (3,536,234,840 ) 3,679,542,857 Equity (deficit), net (503,609,004 ) (236,172,290 ) — 11,531,980 138,527,255 (965,757 ) 20,071,843 72,313,148 (1,516,310,307 ) 467,777,869 (1,546,835,263 ) Depreciation and amortization 59,022,608 9,303,331 — 1,150,621 2,533,607 (47,399 ) 691,806 31,225 1,047,916 — 73,733,715 Net periodic cost of employee benefits 17,203,359 27,159,469 — 16,500 109,640 7,245 6,320 16,764 13,523,709 — 58,043,006 Acquisition of wells, pipelines, properties, plant and equipment 26,220,322 5,598,406 — 305,607 1,203,918 60,585 162,838 72,176 1,221,778 — 34,845,630 As of/for the six month Exploration and Industrial Cogeneration Drilling Logistics Fertilizers Ethylene Trading Corporate and Intersegment Total Sales: Trade — 418,708,519 — — — 2,290,875 6,112,538 234,763,658 1,638,671 — 663,514,261 Intersegment 387,322,281 67,897,390 20,796 1,666,398 45,641,151 51,300 950,069 248,203,044 33,189,159 (784,941,588 ) — Services income — 3,053,130 39,241 12,852 1,774,738 1,488 16,051 382,655 588,418 (447,467 ) 5,421,106 Impairment of wells pipe- lines, properties, plant and equipment 5,343,634 (3,977,849 ) — 2,035,625 — — — — — — 3,401,410 Cost of sales 184,384,848 514,898,359 70,205 619,910 21,607,682 2,692,122 6,918,801 476,326,584 11,762,832 (756,551,811 ) 462,729,532 Gross income (loss) 197,593,799 (21,261,471 ) (10,168 ) (976,285 ) 25,808,207 (348,459 ) 159,857 7,022,773 23,653,416 (28,837,244 ) 202,804,425 Other revenues (expenses), net 15,539,472 1,292,008 — (90,423 ) 65,590 8,658 (7,624 ) (5,857,219 ) 900,306 (25,415 ) 11,825,353 Distribution, transportation and sales expenses — 15,467,380 4,392 — 32,186 231,962 167,348 158,261 18,644 (4,546,078 ) 11,534,095 Administrative expenses 28,475,643 18,824,418 16,858 493,768 3,626,719 243,137 574,522 798,932 30,281,796 (24,512,579 ) 58,823,214 Operating income (loss) 184,657,628 (54,261,261 ) (31,418 ) (1,560,476 ) 22,214,892 (814,900 ) (589,637 ) 208,361 (5,746,718 ) 195,998 144,272,469 Financing income 69,818,829 5,584,282 — 20,592 471,888 990 31,278 462,796 74,909,454 (143,998,362 ) 7,301,747 Financing cost (65,802,803 ) (1,265,639 ) (11,532 ) (417,107 ) (131,032 ) (77,849 ) (16 ) (554,405 ) (125,284,874 ) 143,932,332 (49,612,925 ) Derivative financial instruments (loss) gain, net 60,229 1,217 — — — — — 401,399 19,870,040 — 20,332,885 Foreign exchange (loss) income, net 173,933,137 12,167,046 — 899,966 757,272 17,956 (3,942 ) (74,187 ) 14,965,495 — 202,662,743 (Loss) profit sharing in associates 30,869 8,898 — — — — — 681,074 143,878,951 (143,724,838 ) 874,954 Taxes, duties and other 198,282,332 — — — 4,863,301 — — 2,136,487 (155,996 ) — 205,126,124 Net (loss) income 164,415,557 (37,765,457 ) (42,950 ) (1,057,025 ) 18,449,719 (873,803 ) (562,317 ) (1,011,449 ) 122,748,344 (143,594,870 ) 120,705,749 Total current assets 964,913,349 462,726,752 373,075 5,127,722 42,878,368 973,042 3,775,048 105,579,201 467,085,984 (1,729,964,853 ) 323,467,688 Investments in joint ventures and associates 170,393 258,066 — — — — — 16,177,240 (110,495,118 ) 114,912,582 21,023,163 Wells, pipelines, properties, plant and equipment, net 1,109,802,774 307,817,470 — 17,888,173 119,066,085 7,638,625 19,539,341 6,097,057 34,783,060 — 1,622,632,585 Total assets 2,111,214,443 771,049,731 373,087 23,633,374 179,130,478 8,666,191 23,414,242 132,925,292 2,202,326,329 (3,216,451,328 ) 2,236,281,839 Total current liabilities 267,249,434 361,029,037 489,095 2,193,240 17,339,578 2,975,536 1,838,802 61,377,372 1,372,311,581 (1,724,921,515 ) 361,882,160 Long-term debt 1,593,356,596 23,733,417 — 11,090,841 3,139,978 — — 2,788,070 1,608,410,163 (1,593,095,189 ) 1,649,423,876 Employee benefits 372,165,984 590,820,264 202,730 461,089 602,008 22,824 23,951 (703,089 ) 288,348,867 — 1,251,944,628 Total liabilities 2,307,044,263 979,866,886 692,443 13,816,296 26,070,184 2,998,974 1,870,963 68,760,183 3,287,511,886 (3,331,363,910 ) 3,357,268,168 Equity (deficit), net (195,829,820 ) (208,817,155 ) (319,356 ) 9,817,078 153,060,294 5,667,217 21,543,279 64,165,109 (1,085,185,557 ) 114,912,582 (1,120,986,329 ) Depreciation and amortization 59,311,370 8,916,655 — 1,177,076 2,223,185 202,793 653,504 (51,384 ) 989,451 — 73,422,650 Net periodic cost of employee benefits 17,588,809 28,026,525 10,854 19,962 30,306 2,462 2,058 19,371 13,337,718 — 59,038,065 Acquisition of wells, pipelines, properties, plant and equipment 31,083,773 1,326,858 — 182,596 1,541,121 69,784 109,211 198 1,397,177 — 35,710,718 As of the year ended Exploration and Industrial Cogeneration Services Drilling and Logistics Fertilizers Ethylene Trading Corporate and Intersegment Total 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 ) 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 4,832,462 — 93,979,818
Schedule of Accounting Reconciliations Between Individual and Consolidated Information	The tables below present the financial information of PEMEX’s operating segments, before intersegment eliminations: As of/for the Exploration and Industrial Cogeneration Drilling Logistics Fertilizers Ethylene Trading Corporate and Sales: By segment Ps. 449,592,160 568,641,592 — 3,651,556 34,508,587 2,822,309 7,273,855 425,642,969 52,154,770 Less unrealized intersegment sales — (851,269 ) — (1,413,527 ) — — — (54,429 ) — Total consolidated sales Ps. 449,592,160 567,790,323 — 2,238,029 34,508,587 2,822,309 7,273,855 425,588,540 52,154,770 Operating income (loss): By segment Ps. 253,357,916 (133,275 ) 1,788 (380,095 ) (2,481,028 ) (3,317,231 ) (1,340,824 ) 8,112,877 (5,467,467 ) Less unrealized intersegment sales — (851,269 ) — (1,413,527 ) — — — (54,429 ) — Less unrealized gain due to production cost valuation of inventory (335,833 ) (17,565,631 ) — 388,751 — — — (344,369 ) — Less capitalized refined products (263,624 ) — — — — — — — — Less amortization of capitalized interest 59,491 — — — — — — — — Less depreciation of revaluated assets — — — 296,929 (2,010,226 ) 177,478 620,308 — — Total consolidated operating income (loss) Ps. 252,817,950 (18,550,175 ) 1,788 (1,107,942 ) (4,491,254 ) (3,139,753 ) (720,516 ) 7,714,079 (5,467,467 ) Net income (loss): By segment Ps. 9,805,251 2,862,326 1,789 (493,393 ) 2,417,967 (3,911,486 ) (1,069,148 ) 2,920,468 (47,929,561 ) Less unrealized intersegment sales — (851,269 ) — (1,413,527 ) — — — (54,429 ) — Less unrealized gain due to production cost valuation of inventory (335,833 ) (17,565,631 ) — 388,751 — — — (344,369 ) — Less capitalized refined products (263,624 ) — — — — — — — — Less equity method elimination (20,913 ) (721,547 ) — — 311 397,052 (295,984 ) 1 — Less amortization of capitalized interest 59,491 — — — — — — — — Less depreciation of revaluated assets — — — 548,387 (413,906 ) 177,478 620,308 — — Total consolidated net (loss) income Ps. 9,244,372 (16,276,121 ) 1,789 (969,782 ) 2,004,372 (3,336,956 ) (744,824 ) 2,521,671 (47,929,561 ) Assets: By segment Ps. 2,136,833,275 594,079,464 — 29,277,969 263,496,192 10,541,420 32,133,052 187,936,000 2,159,248,410 Less unrealized intersegment sales 1,057,924 (6,241,247 ) — — 7,184 (26,886 ) (5,304 ) (462,489 ) — Less unrealized gain due to production cost valuation of inventory (3,993,365 ) (59,944,861 ) — — — — — (8,465,262 ) — Less capitalized refined products (263,624 ) — — — — — — — — Less depreciation of revalued assets (23,160,662 ) — — (2,158,379 ) (84,205,024 ) (1,980,175 ) (8,902,379 ) (424,850 ) — Less equity method for unrealized profits (780,537 ) (8,509,974 ) — — (86,676 ) (2,859,122 ) (307,520 ) (735,604 ) — Less amortization of capitalized interest 59,491 8,123 — — — — — — — Total consolidated assets Ps. 2,109,752,502 519,391,505 — 27,119,590 179,211,676 5,675,237 22,917,849 177,847,795 2,159,248,410 Liabilities: By segment Ps. 2,613,361,506 759,983,725 — 14,700,897 40,684,421 6,640,994 2,846,006 106,245,862 3,675,558,718 Less unrealized intersegment sales — (4,419,930 ) — 886,713 — — — (711,215 ) — Total consolidated liabilities Ps. 2,613,361,506 755,563,795 — 15,587,610 40,684,421 6,640,994 2,846,006 105,534,647 3,675,558,718 As of/for the six month Exploration and Industrial Cogeneration Drilling Logistics Fertilizers Ethylene Trading Corporate and Sales: By segment Ps. 387,322,281 490,816,991 60,037 2,761,289 47,415,890 2,380,931 7,078,657 483,379,785 37,529,927 Less unrealized intersegment sales — (1,157,952 ) — (1,082,039 ) — (37,267 ) — (30,428 ) — Total consolidated sales Ps. 387,322,281 489,659,039 60,037 1,679,250 47,415,890 2,343,664 7,078,657 483,349,357 37,529,927 Operating income (loss): By segment Ps. 184,850,445 (51,285,496 ) (31,418 ) (1,771,044 ) 18,769,749 (956,346 ) (1,273,795 ) 130,103 (5,746,720 ) Less unrealized intersegment sales — (1,157,952 ) — (1,082,039 ) — (37,267 ) — (30,428 ) — Less unrealized gain due to production cost valuation of inventory (114,602 ) (1,817,814 ) — 980,327 — — — 108,686 — Less capitalized refined products (137,708 ) — — — — — — — — Less amortization of capitalized interest 59,491 — — — — — — — — Less depreciation of revaluated assets — — — 312,280 3,445,143 178,715 684,156 — — Total consolidated operating income (loss) Ps. 184,657,626 (54,261,262 ) (31,418 ) (1,560,476 ) 22,214,892 (814,898 ) (589,639 ) 208,361 (5,746,720 ) Net income (loss): By segment Ps. 164,547,750 (34,979,887 ) (139,629 ) (1,267,592 ) 15,004,575 8,506,409 (1,147,445 ) (1,089,708 ) 122,748,339 Less unrealized intersegment sales — (1,157,952 ) — (1,082,039 ) — (37,267 ) — (30,428 ) — Less unrealized gain due to production cost valuation of inventory (114,602 ) (1,817,814 ) — 980,327 — — — 108,686 — Less capitalized refined products (137,708 ) — — — — — — — — Less equity method elimination 60,626 190,197 96,679 — — (9,521,659 ) (99,030 ) — — Less amortization of capitalized interest 59,491 — — — — — — — — Less depreciation of revaluated assets — — — 312,280 3,445,143 178,715 684,156 — — Total consolidated net (loss) income Ps. 164,415,557 (37,765,456 ) (42,950 ) (1,057,024 ) 18,449,718 (873,802 ) (562,319 ) (1,011,450 ) 122,748,339 Assets: By segment Ps. 2,136,980,546 1,138,758,388 319,675 26,583,936 299,475,440 17,670,356 36,369,522 142,127,674 2,202,326,329 Less unrealized intersegment sales 605,205 (5,324,176 ) — — 7,184 — (5,304 ) (362,958 ) — Less unrealized gain due to production cost valuation of inventory (3,361,384 ) (35,179,252 ) — — — (37,267 ) — (6,711,506 ) — Less capitalized refined products (137,708 ) — — — — — — — — Less depreciation of revalued assets (22,250,279 ) — — (2,950,563 ) (120,352,146 ) (5,121,329 ) (12,061,980 ) (424,850 ) — Less equity method for unrealized profits (681,429 ) (7,063,571 ) 53,411 — — (3,845,568 ) (887,998 ) (1,703,068 ) — Less amortization of capitalized interest 59,491 8,123 — — — — — — — Total consolidated assets Ps. 2,111,214,442 1,091,199,512 373,086 23,633,373 179,130,478 8,666,192 23,414,240 132,925,292 2,202,326,329 Liabilities: By segment Ps. 2,307,044,263 1,304,436,598 692,443 13,318,729 26,070,184 2,998,974 1,870,963 68,454,797 3,287,511,886 Less unrealized intersegment sales — (4,419,930 ) — 497,567 — — — 305,387 — Total consolidated liabilities Ps. 2,307,044,263 1,300,016,668 692,443 13,816,296 26,070,184 2,998,974 1,870,963 68,760,184 3,287,511,886 As of the year Exploration and Industrial Cogeneration Drilling and Logistics Fertilizers Ethylene Trading Corporate and 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 of revalued assets (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

Revenue (Tables)

Revenue (Tables)	6 Months Ended
	Jun. 30, 2018
Text block1 [abstract]
Schedule of Revenue Disaggregation	As of June 30, 2018 the revenues were as follows: a. Revenue disaggregation Exploration and Industrial Cogeneration Drilling Logistics Fertilizers Ethylene Trading Corporate and Total Geographical market 2018 United States 121,163,393 — — — — — — 77,333,272 — Ps. 198,496,665 Other 69,086,931 — — — — — — 17,841,577 — 86,928,508 Europe 45,439,141 — — — — — — 1,488,060 1,312,586 48,239,787 Local — 482,053,745 — 25,156 2,489,437 1,775,923 6,569,023 4,925,780 2,066,018 499,905,082 2017* United States 85,484,898 — — — — — — 66,122,954 — Ps. 151,607,852 Other 40,199,137 — — — — — — 12,567,251 — 52,766,388 Europe 28,436,524 — — — — — — 592,262 — 29,028,786 Local — 421,761,648 38,554 12,852 1,776,303 2,292,364 6,125,896 1,402,740 2,121,984 435,532,341 Major products and services 2018 Crude oil 235,689,465 — — — — — — — — Ps. 235,689,465 Gas — 54,742,573 — — — — — 22,737,680 — 77,480,253 Refined petroleum products — 425,632,977 — — — 1,773,975 6,563,445 77,151,280 — 511,121,677 Oher — 1,315,231 — — — — — 1,663,907 2,012,018 4,991,156 Services — 362,964 — 25,156 2,489,437 1,948 5,578 35,822 1,366,586 4,287,491 2017* Crude oil 154,120,559 — — — — — — 487,843 — Ps. 154,608,402 Gas — 60,040,711 — — — — — 20,650,874 — 80,691,585 Refined petroleum products – 357,357,083 – – – 2,290,876 6,112,537 57,644,187 – 423,404,683 Oher – 1,310,725 – – – – – 1,860,196 1,638,670 4,809,591 Services – 3,053,129 38,554 12,852 1,776,303 1,488 13,359 42,107 483,314 5,421,106 Timing of revenue recognition 2018 Products transferred at a point in time 235,689,465 482,053,745 – – – – – 101,552,867 2,012,018 Ps. 821,308,095 Products and services transferred over the time – – – 25,156 2,489,437 1,775,923 6,569,023 35,822 1,366,586 12,261,947 2017* Products transferred at a point in time 154,120,559 421,761,648 – – – 2,292,364 6,125,896 80,643,099 1,638,671 Ps. 666,582,237 Products and services transferred over the time – – 38,554 12,852 1,776,303 – – 42,108 483,313 2,353,130 * PEMEX applied modified retrospective transition method to the implementation of IFRS 15. Under this method the comparative financial information is not re–established.

Cash and Cash Equivalents (Tabl

Cash and Cash Equivalents (Tables)	6 Months Ended
	Jun. 30, 2018
Text block1 [abstract]
Summary of Cash and Cash Equivalents	As of June 30, 2018 and December 31, 2017, cash and cash equivalents were as follows: June 30, 2018 December 31, 2017 Cash on hand and in banks (i) Ps. 67,735,427 Ps. 55,871,127 Highly liquid investments (ii) 41,771,284 41,980,627 Ps. 109,506,711 Ps. 97,851,754 (i) Cash on hand and in banks is primarily composed of cash in banks. (ii) Mainly composed of short–term Mexican Government investments

Accounts Receivable, Net (Table

Accounts Receivable, Net (Tables)	6 Months Ended
	Jun. 30, 2018
Text block1 [abstract]
Summary of Accounts Receivable and Other Receivables	As of June 30, 2018 and December 31, 2017, accounts receivable and other receivables were as follows: June 30 , 2018 December 31, 2017 Domestic customers, net Ps. 55,402,470 Ps. 60,057,141 Export customers, net 56,626,963 54,428,883 Sundry debtors 44,402,034 26,105,703 Taxes to be recovered and prepaid taxes 7,539,947 23,039,023 Employees and officers 6,035,862 5,681,478 Advances to suppliers 867,742 1,250,846 Other accounts receivable 662,052 82,160 Ps. 171,537,070 Ps. 170,645,234

Inventories, Net (Tables)

Inventories, Net (Tables)	6 Months Ended
	Jun. 30, 2018
Text block1 [abstract]
Summary of Inventories	As of June 30, 2018 and December 31, 2017, inventories were as follows: June 30 2018 December 31, 2017 Refined and petrochemicals products Ps. 24,490,269 Ps. 27,862,384 Products in transit 13,589,457 19,112,606 Crude oil 9,602,571 11,445,780 Materials and products in stock 5,050,152 5,172,779 Materials in transit 492,262 180,711 Gas and condensate products 101,111 84,670 Ps. 53,325,822 Ps. 63,858,930

Investments in Joint Ventures_2

Investments in Joint Ventures and Associates (Tables)	6 Months Ended
	Jun. 30, 2018
Investments Schedule [Abstract]
Schedule of Permanent Investments in joint Ventures and Associates	The investments in joint ventures and associates as of June 30, 2018 and December 31, 2017, were as follows: Percentage of June 30, 2018 December 31, 2017 Deer Park Refining Limited 49.99 % Ps.14,770,797 Ps. 14,405,542 Sierrita Gas Pipeline LLC 35.00 % 1,052,163 1,084,169 Frontera Brownsville, LLC. 50.00 % 485,543 471,085 CH 4 Energía, S.A. 50.00 % 142,121 315,713 Texas Frontera, LLC. 35.00 % 234,775 239,782 Administración Portuaria Integral de Dos Bocas, S.A. de C.V. 40.00 % 124,423 64,328 PMV Minera, S.A. de C.V. 44.09 % 49,057 45,133 Ductos el peninsular, S. A. P. I. de C. V. 30.00 % 17,783 18,336 Other, net Various 62,093 63,276 Ps. 16,938,755 Ps. 16,707,364
Schedule Profit Sharing in Joint Ventures and Associates	Profit (loss) sharing in joint ventures and associates: June 30, 2018 2017 Deer Park Refining Limited Ps. 375,671 Ps. 626,254 Petroquímica Mexicana de Vinilo, S. A. de C. V. (i) 291,739 92,089 Administración Portuaria Integral de Dos Bocas, S.A. de C.V. 60,095 30,869 Sierrita Pipeline, LLC. 56,422 54,820 PMV Minera, S.A. de C.V. 3,707 4,623 CH4 Energía S.A. de C.V. — 8,898 Other, net 60,502 57,401 Profit sharing in joint ventures and associates Ps. 848,136 Ps. 874,954 (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 damages, 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 full book value was written-off,

Wells, Pipelines, Properties,_2

Wells, Pipelines, Properties, Plant and Equipment, Net (Tables)	6 Months Ended
	Jun. 30, 2018
Detailed Information About Property, Plant and Equipment	Plants Drilling Pipelines Wells Buildings Offshore Furniture and Transportation Construction Land Unproductive Other fixed Total fixed assets Investment Balances as of January 1, 2017 Ps. 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 ) — (4,440,864 ) (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 — 118,652 3,155,845,995 Acquisitions 4,297,491 305,607 482,014 9,621,436 167,620 2,074,119 283,073 107,284 17,214,414 292,678 (106 ) — 34,845,630 Reclassifications 1,335,376 — (1,969,381 ) — (12,140 ) (4,039,499 ) (44,167 ) 20,915 600,671 12,119 2,707,617 (870 ) (1,389,359 ) Capitalization 272,222 — 1,140,129 7,538,411 99,766 — — 206,896 (9,257,424 ) — — — — Impairment 6,886,753 — (1,481,865 ) 30,832,289 (835,859 ) 7,310,570 — — (351,436 ) — — — 42,360,452 Disposals (3,242,791 ) (897,685 ) (426,983 ) (8,297,844 ) (242,061 ) — (407,078 ) (801,084 ) (258,407 ) (310,546 ) (2,707,511 ) — (17,591,990 ) Balances as of June 30, 2018 Ps. 765,574,411 22,851,038 479,612,090 1,307,442,202 63,877,797 318,775,131 50,889,480 22,705,647 137,684,200 44,540,950 — 117,782 3,214,070,728 Accumulated depreciation and amortization Balances as of January 1, 2017 Ps. (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 ) Depreciation and amortization (19,911,542 ) (1,078,808 ) (7,808,357 ) (35,229,793 ) (933,896 ) (6,877,975 ) (1,411,430 ) (481,914 ) — — — — (73,733,715 ) Reclassifications (244,470 ) — 224,869 — 19,614 1,344,469 65,719 (20,842 ) — — — — 1,389,359 Disposals 1,588,131 264,028 161,353 5,187,467 90,274 — 367,418 175,451 — — — — 7,834,122 Balances as of June 30, 2018 Ps. (412,592,028) (5,828,764 ) (167,381,549 ) (938,441,962 ) (41,865,017 ) (170,740,741 ) (39,951,231 ) (7,045,611 ) — — — — (1,783,846,903 ) Wells, pipelines, properties, plant and equipment net as of December 31,2017 Ps. 62,001,213 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 1,436,509,325 Wells, pipelines, properties, plant and equipment net as of June 30, 2018 Ps. 352,982,383 17,022,274 312,230,541 369,000,240 22,012,780 148,034,390 10,938,249 15,660,036 137,684,200 44,540,950 — 117,782 1,430,223,825 Depreciation rates 3 to 5 % 5 % 2 ti 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 June 30, 2018 and 2017, the financing costs identified with fixed assets in the construction or installation stage, capitalized as part of the value of such fixed assets, were Ps.1,033,422 and Ps.1,890,312. respectively. b. The combined depreciation of fixed assets and amortization of wells for the periods ended June 30, 2018 and 2017, recognized in operating costs and expenses, was Ps. 73,733,715, and Ps. 73,422,431, respectively, which includes costs related to plugging and abandonment of wells as of June 30, 2018 and 2017 of Ps. 528,541 and Ps. 419,869, respectively. c. As of June 30, 2018 and December 31, 2017, provisions relating to future plugging of wells costs amounted to Ps. 73,160,276 and Ps. 68,797,600, respectively, and are presented in the “Provisions for plugging of wells” (see Note 17). d. As of June 30, 2018, PEMEX recognized a reversal of impairment of Ps. 42,360,452. which is presented as a separate line item in the consolidated statement of comprehensive income as follows:
Assumptions to Determine Net Present Value of Reserves Long Lived Assets	To determine the value in use of long-lived assets associated to hydrocarbon extraction, the net present value of reserves is determined based on the following assumptions: Average crude oil price 61.08 USD/bl Average gas price 4.17 USD/mpc Average condensates price 36.85 USD/bl Discount rate 14.72% anual
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 52.3 U.S. dollars N.A. N.A. Processed volume 1,100 mbd 3,085 mmpcd of Variable Rate of U.S. dollar Ps.19.8633 mxp/usd Ps.19.8633 mxp/usd Ps.19.8633 mxp/usd Useful lives of the cash generating units Average 14 years Average 8 years Average 7 years Discount rate 11.76% anually 10.82% anually 9.33% anually Period 2019-2034 2019-2029 2019-2024
Fixed assets [member] | Pemex industrial transformation [member]
Summary of Net Impairment and Net Reversal of Impairment	The reversal of impairment was in the following cash generating units: Minatitlán Refinery Ps. 10,851,186 Madero Refinery 8,480,880 Salina Cruz Refinery (11,529,001 ) Net reversal of impairment Ps. 7,803,065 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 June 30, 2018, the value in use for the impairment or reversal of impairment of fixed assets was as follows: Minatitlán Refinery Ps.41,290,257 Madero Refinery 20,843,922 Ps.62,134,179
PEMEX [member]
Summary of Net Impairment and Net Reversal of Impairment	d. As of June 30, 2018, PEMEX recognized a reversal of impairment of Ps. 42,360,452. which is presented as a separate line item in the consolidated statement of comprehensive income as follows: (Impairment) Reversal of Reversal of Pemex Exploration and Production Ps. (1,459,374 ) Ps. 38,170,777 Ps. 36,711,403 Pemex Fertilizers (2,154,016 ) — (2,154,016 ) Pemex Industrial Transformation (11,529,001 ) 19,332,066 7,803,065 Total Ps. (15,142,391 ) Ps. 57,502,843 Ps. 42,360,452

Intangible Assets (Tables)

Intangible Assets (Tables)	6 Months Ended
	Jun. 30, 2018
Text block1 [abstract]
Schedule of Intangible Assets are Wells Unassigned to a Reserve	As of June 30, 2018 and December 31, 2017, intangible assets were Ps. 13,974,430 and Ps. 14,678,640, respectively, which are mainly wells unassigned to a reserve, which amounted, as follows: June 30, December 31, Wells unassigned to a reserve: Balance at the beginning of period Ps. 9,088,563 Ps. 8,639,242 Additions to construction in progress 9,810,680 20,553,952 Transfers against expenses (8,447,877 ) (3,663,986 ) Transfers against fixed assets (2,359,312 ) (16,440,645 ) Balance at the end of period Ps. 8,092,054 Ps. 9,088,563
Schedule of Other Concepts of Intangible Assets	The other concepts of intangible assets are: June 30, 2018 December 31, Rights of way Ps. 2,350,847 Ps.2,311,743 License 3,791,955 3,586,553 Exploration expenses, evaluation of assets and concessoins 2,130,857 1,861,092 Accumulated amortization (2,391,283 ) (2,169,311 ) Balance at the end of period Ps.5,882,376 Ps. 5,590,077

Long-Term Notes Receivable an_2

Long-Term Notes Receivable and Other Assets (Tables)	6 Months Ended
	Jun. 30, 2018
Text block1 [abstract]
Summary of Long-Term Notes Receivable	As of June 30, 2018 and December 31, 2017, the balance of long-term notes receivable was as follows: June 30, 2018 December 31, 2017 Promissory notes issued by the Mexican Government Ps. 148,338,390 Ps. 147,274,076 Other long-term notes receivable 1,022,386 1,218,833 Total long-term notes receivable Ps. 149,360,776 Ps. 148,492,909
Summary of Promissory Notes Issued	Promissory notes issued by the Mexican Government June 30, 2018 December 31, 2017 Total promissory notes Ps. 152,010,092 Ps. 149,796,282 Less: current portion of notes receivable (1) 3,671,702 2,522,206 Long-term promissory notes Ps. 148,338,390 Ps. 147,274,076 (1) The current portion of the promissory notes and the total yield payments due are allocated under sundry debtors in accounts receivable, net (see Note 7).
Summary of Promissory Notes Maturity Dates and Annual Rates	As of June 30, 2018 and December 31, 2017, these promissory notes amounted to Ps. 148,338,390 and Ps. 147,274,076, respectively. PEMEX intends 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% as follows: Number of Promissory Notes Maturity Yield Rate Range Principal 1 2019 5.14% Ps. 3,671,702 1 2020 5.39% 4,539,577 1 2021 5.57% 5,382,870 1 2022 5.74% 5,969,742 1 2023 5.87% 6,519,694 5 2024-2028 5.98% a 6.47% 36,001,121 5 2029-2033 6.61% a 6.85% 36,290,602 5 2034-2038 6.89% a 7.02% 33,018,175 4 2039-2042 7.00% a 6.94% 20,616,609 Total promissory notes 152,010,092 Less: current portion 3,671,702 Long-term notes receivable Ps. 148,338,390
Summary of Other Assets	As of June 30, 2018 and December 31, 2017, the balance of other assets was as follows: June 30, December 31, Payments in advance Ps. 3,328,576 Ps. 4,683,117 Other 7,987,986 1,211,984 Total other assets Ps. 11,316,562 Ps. 5,895,100

Debt (Tables)

Debt (Tables)	6 Months Ended
	Jun. 30, 2018
Text block1 [abstract]
Summary of Foreign Currency Translation	As of June 30, 2018, PEMEX used the following exchange rates: June 30, 2018 U.S. dollar 19.86330 Japanese yen 0.18002 Pound sterling 26.00901 Euro 23.00567 Swiss francs 19.92107 Australian dollar 14.61939

Financial Instruments (Tables)

Financial Instruments (Tables)	6 Months Ended
	Jun. 30, 2018
Text block1 [abstract]
Summary of Carrying Amounts of Financial Assets and Liabilities	The following tables present information about PEMEX’s carrying amounts and fair values of financial assets and financial liabilities, including their levels in the fair value hierarchy. It does not include fair value information for financial assets and financial liabilities not measured at fair value if the carrying amount is a reasonable approximation of fair value. Carrying amount Fair value hierarchy As of June 30, 2018 In thousands of pesos FVTPL FVOCI – debt FVOCI – Financial assets Other financial Total carrying Level 1 Level 2 Level 3 Total Financial assets measured at fair value Derivative financial instruments Ps. 27,141,083 — — — — Ps. 27,141,083 — 27,141,083 — 27,141,083 Equity instrument — — 1,056,918 — — 1,056,918 — 1,056,918 — 1,056,918 Ps. 27,141,083 — 1,056,918 — — Ps. 28,198,001 Financial assets not measured at fair value Cash and cash equivalents Ps. — — — 109,506,710 — Ps. 109,506,710 — — — — Accounts receivable — — — 171,537,070 — 171,537,070 — — — — Investments in joint ventures, associates — — — 16,938,755 — 16,938,755 — — — — Long-term notes receivable — — — 149,360,776 — 149,360,776 — — — — Ps. — — — 447,343,311 — Ps. 4 47,343,311 Financial liabilities measured at fair value Derivative financial instruments Ps. (14,958,973 ) — — — — Ps. (14,958,973 ) — (14,958,973 ) — (14,958,973 ) Ps. (14,958,973 ) — — — — Ps. (14,958,973 ) Financial liabilities not measured at fair value Suppliers Ps. — — — — (109,471,364 ) Ps. 109,471,364 ) — — — — Accounts payable — — — — (21,301,855 ) (21,301,855 ) — — — — Debt — — — — (2,070,332,329 ) (2,070,332,329 ) — (2,099,656,515 ) — (2,099,656,515 ) Ps. — — — — (2,201,105,548 ) Ps. (2,201,105,548 ) Carrying amount Fair value hierarchy As of December 31, 2017 In thousands of pesos FVTPL Held-to- Loans and Available- for-sale Other financial Total carrying Level 1 Level 2 Level 3 Total Financial assets measured at fair value Derivative financial instruments Ps. 30,113,454 — — — — Ps. 30,113,454 — 30,113,454 — 30,113,454 Investments in associates — — — 1,056,918 — 1,056,918 — 1,056,918 — 1,056,918 Ps. 30,113,454 — — 1,056,918 — Ps. 31,170,372 Financial assets not measured at fair value Cash and cash equivalents Ps. — — 97,851,754 — — Ps. 97,851,754 — — — — Accounts receivable — — 170,645,678 — — 170,645,678 — — — — Investments in joint ventures, associates — 16,707,364 — — — 16,707,364 — — — — Long-term notes receivable — 148,492,909 — — — 148,492,909 — — — — Ps. — 165,200,273 268,497,432 — — Ps. 433,697,705 Financial liabilities measured at fair value Derivative financial instruments Ps. (17,745,979) — — — — Ps. (17,745,979 ) — (17,745,979 ) — (17,745,979 ) Ps. (17,745,979) — — — — Ps. (17,745,979 ) Financial liabilities not measured at fair value Suppliers Ps. — — — — (139,955,378 ) Ps. (139,955,378 ) — — — — Accounts payable — — — — (23,211,845 ) (23,211,845 ) — — — — Debt — — — — (2,037,875,071 ) (2,037,875,071 ) — (2,153,383,220 ) — (2,153,383,220 ) Ps. — — — — (2,201,042,294 ) Ps.

Provisions for Sundry Credito_2

Provisions for Sundry Creditors (Tables)	6 Months Ended
	Jun. 30, 2018
Text block1 [abstract]
Summary of Provisions for Sundry Creditors and Others	As of June 30, 2018 and December 31, 2017, the provisions for sundry creditors and others is as follows: June 30, 2018 December 31, 2017 Provision for plugging of wells (Note 12) Ps. 73,160,276 Ps. 68,797,600 Provision for trials in process (Note 18) 9,502,852 7,812,689 Provision for environmental costs 11,320,443 11,067,134 Ps. 93,983,571 Ps. 87,677,423

Structure and Business Operat_2

Structure and Business Operations of Petroleos Mexicanos, Subsidiary Entities and Subsidiary Companies - Additional Information (Detail)	Jun. 30, 2018
Description of business and nature of operations [abstract]
Ownership percentage	100.00%

Basis of Preparation - Addition

Basis of Preparation - Additional Information (Detail) - MXN ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Disclosure of basis of preparation of financial statements [line items]
Recognized net losses	$ 49,860,395
Negative equity amount	1,546,835,263	$ 1,502,352,385
Negative working capital	$ 8,450,455	$ 25,600,895
Percentage of increase in annual budget	1.70%
Employee benefits provision	35.00%	35.00%
Bottom of range [member]
Disclosure of basis of preparation of financial statements [line items]
Market share percentage	65.00%
2018 [member]
Disclosure of basis of preparation of financial statements [line items]
Annual budget amount	$ 391,946,000
2017 [member]
Disclosure of basis of preparation of financial statements [line items]
Annual budget amount	$ 385,211,257

Significant Accounting Polici_4

Significant Accounting Policies - Additional Information (Detail) - MXN ($) $ in Thousands	Jan. 01, 2018	Jun. 30, 2018
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.
Percentage of domestic and export sales of crude oil in national and international market		50.00%
Initial effect by the adoption of IFRS 9	$ (24,957)	$ (24,957)
Bottom of range [member]
Disclosure of significant accounting policies [line items]
Voting rights in another entity		20.00%
Top of range [member]
Disclosure of significant accounting policies [line items]
Voting rights in another entity		50.00%

Significant Accounting Polici_5

Significant Accounting Policies - Summary of Reclassification of Other Assets to Intangible Assets (Detail) - MXN ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of reclassification of financial assets [line items]
Intangible assets	$ 13,974,430	$ 14,678,640	$ 8,639,242
Other assets	$ 11,316,562	5,895,100
As previously reported [member]
Disclosure of reclassification of financial assets [line items]
Intangible assets		9,088,563
Other assets		11,485,177
Reclassification [member]
Disclosure of reclassification of financial assets [line items]
Intangible assets		5,590,077
Other assets		$ (5,590,077)

Segment Financial Information -

Segment Financial Information - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2018SegmentMajor_Customer
Disclosure of operating segments [abstract]
Number of business segments | Segment	9
Number of major customers | Major_Customer	32

Segment Financial Information_2

Segment Financial Information - Condensed Financial Information of Segments after Elimination of Unrealized Intersegment Gain (Loss) (Detail) - MXN ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017	Dec. 31, 2016
Sales:
Trade			$ 829,282,552	$ 663,514,261
Services income	$ 2,253,692	$ 3,049,272	4,287,490	5,421,106
(Reversal) impairment of wells pipe-lines, properties, plant and equipment	(23,322,073)	(18,927,912)	(42,360,452)	3,401,410
Cost of sales	304,203,639	227,367,003	580,975,521	462,729,532
Gross income	155,292,913	113,065,536	294,954,973	202,804,425
Other revenues (expenses), net	3,478,841	(4,348,720)	7,724,055	11,825,353
Distribution, transportation and sales expenses			11,074,051	11,534,095
Administrative expenses	33,352,971	30,666,104	64,326,282	58,823,214
Operating income (loss)			227,278,695	144,272,469
Financing income	1,849,510	3,693,243	10,969,569	7,301,747
Financing cost	(29,804,118)	(23,718,851)	(56,972,817)	(49,612,925)
Derivative financial instruments (loss) gain, net	(20,966,630)	19,732,250	(9,292,906)	20,332,885
Foreign exchange (loss) income, net	(118,348,021)	60,572,598	2,505,317	202,662,743
(Loss) profit sharing in associates			848,136	874,954
Taxes, duties and other			225,196,389	205,126,124
Net (loss) income	(163,172,506)	32,770,457	(49,860,395)	120,715,749
Total current assets	362,567,604	323,467,688	362,567,604	323,467,688	$ 363,526,290
Investments in joint ventures and associates	16,938,755	21,023,163	16,938,755	21,023,163	16,707,364
Wells, pipelines, properties, plant and equipment, net	1,430,223,825	1,622,632,585	1,430,223,825	1,622,632,585	1,436,509,326
Total assets	2,132,707,594	2,236,281,839	2,132,707,594	2,236,281,839	2,132,002,114
Total current liabilities	371,018,059	361,882,160	371,018,059	361,882,160	389,127,185
Long-term debt	1,903,230,338	1,649,423,876	1,903,230,338	1,649,423,876	1,880,665,604
Employee benefits	1,287,907,942	1,251,944,628	1,287,907,942	1,251,944,628	1,258,436,122
Total liabilities	3,679,542,857	3,357,268,168	3,679,542,857	3,357,268,168	3,634,354,499
Equity (deficit), net	(1,546,835,263)	(1,120,986,331)	(1,546,835,263)	(1,120,986,331)	(1,502,352,385)	$ (1,233,008,147)
Depreciation and amortization			73,733,715	73,422,650
Net periodic cost of employee benefits	58,043,006	59,038,065	58,043,006	59,038,065
Acquisition of wells, pipelines, properties, plant and equipment			34,845,630	35,710,718	93,979,818
Exploration and Production [member]
Sales:
Trade			235,689,465
Intersegment			213,902,695	387,322,281
(Reversal) impairment of wells pipe-lines, properties, plant and equipment			(36,711,403)	5,343,634
Cost of sales			210,101,903	184,384,848
Gross income			276,201,660	197,593,799
Other revenues (expenses), net			4,101,924	15,539,472
Distribution, transportation and sales expenses			124,828
Administrative expenses			27,360,806	28,475,643
Operating income (loss)			252,817,950	184,657,628
Financing income			42,975,869	69,818,829
Financing cost			(59,110,719)	(65,802,803)
Derivative financial instruments (loss) gain, net			(9,682,793)	60,229
Foreign exchange (loss) income, net			8,727,059	173,933,137
(Loss) profit sharing in associates			60,095	30,869
Taxes, duties and other			226,543,089	198,282,332
Net (loss) income			9,244,372	164,415,557
Total current assets	1,092,665,803	964,913,349	1,092,665,803	964,913,349	1,036,063,541
Investments in joint ventures and associates	124,423	170,393	124,423	170,393	64,328
Wells, pipelines, properties, plant and equipment, net	943,299,127	1,109,802,774	943,299,127	1,109,802,774	945,945,889
Total assets	2,109,752,502	2,111,214,443	2,109,752,502	2,111,214,443	2,058,036,405
Total current liabilities	292,778,523	267,249,434	292,778,523	267,249,434	284,656,058
Long-term debt	1,849,958,235	1,593,356,596	1,849,958,235	1,593,356,596	1,826,843,268
Employee benefits	380,688,849	372,165,984	380,688,849	372,165,984	372,032,958
Total liabilities	2,613,361,506	2,307,044,263	2,613,361,506	2,307,044,263	2,570,412,398
Equity (deficit), net	(503,609,004)	(195,829,820)	(503,609,004)	(195,829,820)	(512,375,993)
Depreciation and amortization			59,022,608	59,311,370
Net periodic cost of employee benefits	17,203,359	17,588,809	17,203,359	17,588,809
Acquisition of wells, pipelines, properties, plant and equipment			26,220,322	31,083,773	67,845,989
Industrial Transformation [member]
Sales:
Trade			481,690,782	418,708,519
Intersegment			85,736,578	67,897,390
Services income			362,963	3,053,130
(Reversal) impairment of wells pipe-lines, properties, plant and equipment			(7,803,065)	(3,977,849)
Cost of sales			563,862,842	514,898,359
Gross income			11,730,546	(21,261,471)
Other revenues (expenses), net			3,348,024	1,292,008
Distribution, transportation and sales expenses			12,392,562	15,467,380
Administrative expenses			21,236,183	18,824,418
Operating income (loss)			(18,550,175)	(54,261,261)
Financing income			4,867,481	5,584,282
Financing cost			(973,317)	(1,265,639)
Derivative financial instruments (loss) gain, net			(20,907)	1,217
Foreign exchange (loss) income, net			(1,599,203)	12,167,046
(Loss) profit sharing in associates				8,898
Net (loss) income			(16,276,121)	(37,765,457)
Total current assets	228,874,626	462,726,752	228,874,626	462,726,752	570,380,888
Investments in joint ventures and associates	4	258,066	4	258,066	4
Wells, pipelines, properties, plant and equipment, net	289,594,157	307,817,470	289,594,157	307,817,470	286,423,735
Total assets	519,391,505	771,049,731	519,391,505	771,049,731	857,196,306
Total current liabilities	126,822,276	361,029,037	126,822,276	361,029,037	459,130,165
Long-term debt	21,262,169	23,733,417	21,262,169	23,733,417	25,437,147
Employee benefits	603,048,228	590,820,264	603,048,228	590,820,264	588,573,518
Total liabilities	755,563,795	979,866,886	755,563,795	979,866,886	1,077,108,748
Equity (deficit), net	(236,172,290)	(208,817,155)	(236,172,290)	(208,817,155)	(219,912,442)
Depreciation and amortization			9,303,331	8,916,655
Net periodic cost of employee benefits	27,159,469	28,026,525	27,159,469	28,026,525
Acquisition of wells, pipelines, properties, plant and equipment			5,598,406	1,326,858	14,678,182
Cogeneration and Services [member]
Sales:
Intersegment				20,796
Services income				39,241
Cost of sales				70,205
Gross income				(10,168)
Other revenues (expenses), net			1,788
Distribution, transportation and sales expenses				4,392
Administrative expenses				16,858
Operating income (loss)			1,788	(31,418)
Financing income			1
Financing cost				(11,532)
Net (loss) income			1,789	(42,950)
Total current assets		373,075		373,075	179,807
Total assets		373,087		373,087	179,807
Total current liabilities		489,095		489,095	531,580
Employee benefits		202,730		202,730
Total liabilities		692,443		692,443	531,580
Equity (deficit), net		(319,356)		(319,356)	(351,773)
Net periodic cost of employee benefits		10,854		10,854
Drilling and Services [member]
Sales:
Intersegment			2,212,873	1,666,398
Services income			25,156	12,852
(Reversal) impairment of wells pipe-lines, properties, plant and equipment				2,035,625
Cost of sales			1,060,852	619,910
Gross income			1,177,177	(976,285)
Other revenues (expenses), net			(1,932,918)	(90,423)
Distribution, transportation and sales expenses			63
Administrative expenses			352,138	493,768
Operating income (loss)			(1,107,942)	(1,560,476)
Financing income			142,575	20,592
Financing cost			(381,390)	(417,107)
Foreign exchange (loss) income, net			(34,203)	899,966
Taxes, duties and other			(411,178)
Net (loss) income			(969,782)	(1,057,025)
Total current assets	8,774,048	5,127,722	8,774,048	5,127,722	6,871,148
Wells, pipelines, properties, plant and equipment, net	17,478,212	17,888,173	17,478,212	17,888,173	18,956,882
Total assets	27,119,590	23,633,374	27,119,590	23,633,374	26,220,748
Total current liabilities	2,924,666	2,193,240	2,924,666	2,193,240	2,201,936
Long-term debt	10,814,834	11,090,841	10,814,834	11,090,841	11,258,734
Employee benefits	349,713	461,089	349,713	461,089	333,212
Total liabilities	15,587,610	13,816,296	15,587,610	13,816,296	13,886,424
Equity (deficit), net	11,531,980	9,817,078	11,531,980	9,817,078	12,334,324
Depreciation and amortization			1,150,621	1,177,076
Net periodic cost of employee benefits	16,500	19,962	16,500	19,962
Acquisition of wells, pipelines, properties, plant and equipment			305,607	182,596	418,283
Logistics [member]
Sales:
Intersegment			32,019,150	45,641,151
Services income			2,489,437	1,774,738
Cost of sales			20,167,802	21,607,682
Gross income			14,340,785	25,808,207
Other revenues (expenses), net			(14,265,893)	65,590
Distribution, transportation and sales expenses			15,382	32,186
Administrative expenses			4,550,764	3,626,719
Operating income (loss)			(4,491,254)	22,214,892
Financing income			612,787	471,888
Financing cost			(144,266)	(131,032)
Foreign exchange (loss) income, net			(98,860)	757,272
(Loss) profit sharing in associates			(553)
Taxes, duties and other			(6,126,518)	4,863,301
Net (loss) income			2,004,372	18,449,719
Total current assets	31,284,758	42,878,368	31,284,758	42,878,368	49,391,784
Investments in joint ventures and associates	17,783		17,783		18,336
Wells, pipelines, properties, plant and equipment, net	117,402,968	119,066,085	117,402,968	119,066,085	119,647,553
Total assets	179,211,676	179,130,478	179,211,676	179,130,478	191,895,993
Total current liabilities	29,530,499	17,339,578	29,530,499	17,339,578	44,521,371
Long-term debt	2,438,389	3,139,978	2,438,389	3,139,978	2,814,640
Employee benefits	1,952,532	602,008	1,952,532	602,008	1,842,892
Total liabilities	40,684,421	26,070,184	40,684,421	26,070,184	56,706,251
Equity (deficit), net	138,527,255	153,060,294	138,527,255	153,060,294	135,189,742
Depreciation and amortization			2,533,607	2,223,185
Net periodic cost of employee benefits	109,640	30,306	109,640	30,306
Acquisition of wells, pipelines, properties, plant and equipment			1,203,918	1,541,121	5,189,409
Fertilizers [member]
Sales:
Trade			1,773,974	2,290,875
Intersegment			1,046,387	51,300
Services income			1,948	1,488
(Reversal) impairment of wells pipe-lines, properties, plant and equipment			2,154,016
Cost of sales			3,411,785	2,692,122
Gross income			(2,743,492)	(348,459)
Other revenues (expenses), net			25,831	8,658
Distribution, transportation and sales expenses			179,403	231,962
Administrative expenses			242,689	243,137
Operating income (loss)			(3,139,753)	(814,900)
Financing income			2,818	990
Financing cost			(189,543)	(77,849)
Foreign exchange (loss) income, net			(10,478)	17,956
Net (loss) income			(3,336,956)	(873,803)
Total current assets	1,963,988	973,042	1,963,988	973,042	3,155,476
Wells, pipelines, properties, plant and equipment, net	3,659,202	7,638,625	3,659,202	7,638,625	5,713,998
Total assets	5,675,237	8,666,191	5,675,237	8,666,191	8,923,456
Total current liabilities	6,531,365	2,975,536	6,531,365	2,975,536	6,455,246
Employee benefits	105,605	22,824	105,605	22,824	98,361
Total liabilities	6,640,994	2,998,974	6,640,994	2,998,974	6,556,050
Equity (deficit), net	(965,757)	5,667,217	(965,757)	5,667,217	2,367,406
Depreciation and amortization			(47,399)	202,793
Net periodic cost of employee benefits	7,245	2,462	7,245	2,462
Acquisition of wells, pipelines, properties, plant and equipment			60,585	69,784	219,152
Ethylene [member]
Sales:
Trade			6,563,445	6,112,538
Intersegment			704,832	950,069
Services income			5,578	16,051
Cost of sales			7,353,302	6,918,801
Gross income			(79,447)	159,857
Other revenues (expenses), net			67,732	(7,624)
Distribution, transportation and sales expenses			82,391	167,348
Administrative expenses			626,410	574,522
Operating income (loss)			(720,516)	(589,637)
Financing income			11,729	31,278
Financing cost			(25,559)	(16)
Foreign exchange (loss) income, net			(10,478)	(3,942)
Net (loss) income			(744,824)	(562,317)
Total current assets	4,276,184	3,775,048	4,276,184	3,775,048	3,994,381
Wells, pipelines, properties, plant and equipment, net	18,479,853	19,539,341	18,479,853	19,539,341	19,008,822
Total assets	22,917,849	23,414,242	22,917,849	23,414,242	23,142,045
Total current liabilities	2,703,176	1,838,802	2,703,176	1,838,802	2,183,654
Employee benefits	111,353	23,951	111,353	23,951	105,033
Total liabilities	2,846,006	1,870,963	2,846,006	1,870,963	2,308,890
Equity (deficit), net	20,071,843	21,543,279	20,071,843	21,543,279	20,833,155
Depreciation and amortization			691,806	653,504
Net periodic cost of employee benefits	6,320	2,058	6,320	2,058
Acquisition of wells, pipelines, properties, plant and equipment			162,838	109,211	475,196
Trading Companies [member]
Sales:
Trade			101,552,868	234,763,658
Intersegment			323,999,851	248,203,044
Services income			35,821	382,655
Cost of sales			417,171,921	476,326,584
Gross income			8,416,619	7,022,773
Other revenues (expenses), net			447,308	(5,857,219)
Distribution, transportation and sales expenses			232,858	158,261
Administrative expenses			916,991	798,932
Operating income (loss)			7,714,078	208,361
Financing income			370,485	462,796
Financing cost			(732,894)	(554,405)
Derivative financial instruments (loss) gain, net			(1,661,925)	401,399
Foreign exchange (loss) income, net			265,227	(74,187)
(Loss) profit sharing in associates			432,093	681,074
Taxes, duties and other			3,865,394	2,136,487
Net (loss) income			2,521,670	(1,011,449)
Total current assets	148,590,483	105,579,201	148,590,483	105,579,201	158,414,445
Investments in joint ventures and associates	15,965,142	16,177,240	15,965,142	16,177,240	15,805,506
Wells, pipelines, properties, plant and equipment, net	6,763,729	6,097,057	6,763,729	6,097,057	6,739,231
Total assets	177,847,795	132,925,292	177,847,795	132,925,292	186,808,899
Total current liabilities	100,825,821	61,377,372	100,825,821	61,377,372	112,046,527
Long-term debt	2,344,152	2,788,070	2,344,152	2,788,070	2,712,654
Employee benefits	(930,408)	(703,089)	(930,408)	(703,089)	(966,238)
Total liabilities	105,534,647	68,760,183	105,534,647	68,760,183	116,842,881
Equity (deficit), net	72,313,148	64,165,109	72,313,148	64,165,109	69,966,018
Depreciation and amortization			31,225	(51,384)
Net periodic cost of employee benefits	16,764	19,371	16,764	19,371
Acquisition of wells, pipelines, properties, plant and equipment			72,176	198	321,145
Corporate and Other Operating Subsidiary Companies [member]
Sales:
Trade			2,012,018	1,638,671
Intersegment			48,776,165	33,189,159
Services income			1,366,587	588,418
Cost of sales			24,906,788	11,762,832
Gross income			27,247,982	23,653,416
Other revenues (expenses), net			1,520,399	900,306
Distribution, transportation and sales expenses			37,459	18,644
Administrative expenses			34,198,389	30,281,796
Operating income (loss)			(5,467,467)	(5,746,718)
Financing income			70,368,989	74,909,454
Financing cost			(103,576,300)	(125,284,874)
Derivative financial instruments (loss) gain, net			2,072,712	19,870,040
Foreign exchange (loss) income, net			(4,733,747)	14,965,495
(Loss) profit sharing in associates			(5,268,146)	143,878,951
Taxes, duties and other			1,325,602	(155,996)
Net (loss) income			(47,929,561)	122,748,344
Total current assets	536,016,409	467,085,984	536,016,409	467,085,984	506,187,594
Investments in joint ventures and associates	(466,946,467)	(110,495,118)	(466,946,467)	(110,495,118)	(465,026,224)
Wells, pipelines, properties, plant and equipment, net	33,546,577	34,783,060	33,546,577	34,783,060	34,073,216
Total assets	2,159,248,411	2,202,326,329	2,159,248,411	2,202,326,329	2,111,740,735
Total current liabilities	1,491,499,353	1,372,311,581	1,491,499,353	1,372,311,581	1,439,097,882
Long-term debt	1,862,043,745	1,608,410,163	1,862,043,745	1,608,410,163	1,837,690,559
Employee benefits	302,582,070	288,348,867	302,582,070	288,348,867	296,416,386
Total liabilities	3,675,558,718	3,287,511,886	3,675,558,718	3,287,511,886	3,587,988,972
Equity (deficit), net	(1,516,310,307)	(1,085,185,557)	(1,516,310,307)	(1,085,185,557)	(1,476,248,237)
Depreciation and amortization			1,047,916	989,451
Net periodic cost of employee benefits	13,523,709	13,337,718	13,523,709	13,337,718
Acquisition of wells, pipelines, properties, plant and equipment			1,221,778	1,397,177	4,832,462
Eliminations [member]
Sales:
Intersegment			(708,398,531)	(784,941,588)
Services income				(447,467)
Cost of sales			(667,061,674)	(756,551,811)
Gross income			(41,336,857)	(28,837,244)
Other revenues (expenses), net			14,409,860	(25,415)
Distribution, transportation and sales expenses			(1,990,895)	(4,546,078)
Administrative expenses			(25,158,088)	(24,512,579)
Operating income (loss)			221,986	195,998
Financing income			(108,383,165)	(143,998,362)
Financing cost			108,161,171	143,932,332
Derivative financial instruments (loss) gain, net			7
(Loss) profit sharing in associates			5,624,647	(143,724,838)
Net (loss) income			5,624,646	(143,594,870)
Total current assets	(1,689,878,695)	(1,729,964,853)	(1,689,878,695)	(1,729,964,853)	(1,971,112,774)
Investments in joint ventures and associates	467,777,870	114,912,582	467,777,870	114,912,582	465,845,414
Total assets	(3,068,456,971)	(3,216,451,328)	(3,068,456,971)	(3,216,451,328)	(3,332,142,280)
Total current liabilities	(1,682,597,620)	(1,724,921,515)	(1,682,597,620)	(1,724,921,515)	(1,961,697,234)
Long-term debt	(1,845,631,186)	(1,593,095,189)	(1,845,631,186)	(1,593,095,189)	(1,826,091,398)
Total liabilities	(3,536,234,840)	(3,331,363,910)	(3,536,234,840)	(3,331,363,910)	(3,797,987,695)
Equity (deficit), net	$ 467,777,869	$ 114,912,582	$ 467,777,869	$ 114,912,582	$ 465,845,415

Segment Financial Information_3

Segment Financial Information - Schedule of Accounting Reconciliations Between Individual and Consolidated Information (Detail) - MXN ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Disclosure of operating segments [line items]
Total consolidated sales	$ 436,174,479	$ 321,504,627	$ 833,570,042	$ 668,935,367
Total consolidated operating income (loss)			227,278,695	144,272,469
Total consolidated net (loss) income	(163,172,506)	32,770,457	(49,860,395)	120,715,749
Total consolidated assets	2,132,707,594	2,236,281,839	2,132,707,594	2,236,281,839	$ 2,132,002,114
Total consolidated liabilities	3,679,542,857	3,357,268,168	3,679,542,857	3,357,268,168	3,634,354,499
Exploration and Production [member]
Disclosure of operating segments [line items]
Total consolidated sales			449,592,160	387,322,281
Total consolidated operating income (loss)			252,817,950	184,657,628
Total consolidated net (loss) income			9,244,372	164,415,557
Total consolidated assets	2,109,752,502	2,111,214,443	2,109,752,502	2,111,214,443	2,058,036,405
Total consolidated liabilities	2,613,361,506	2,307,044,263	2,613,361,506	2,307,044,263	2,570,412,398
Exploration and Production [member] | By segment [member]
Disclosure of operating segments [line items]
Total consolidated sales			449,592,160	387,322,281
Total consolidated operating income (loss)			253,357,916	184,850,445
Total consolidated net (loss) income			9,805,251	164,547,750
Total consolidated assets	2,136,833,275	2,136,980,546	2,136,833,275	2,136,980,546	2,084,553,745
Total consolidated liabilities	2,613,361,506	2,307,044,263	2,613,361,506	2,307,044,263	2,570,412,398
Exploration and Production [member] | unrealized Intersegment Sales [member]
Disclosure of operating segments [line items]
Total consolidated assets	1,057,924	605,205	1,057,924	605,205	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 income (loss)			(335,833)	(114,602)
Total consolidated net (loss) income			(335,833)	(114,602)
Total consolidated assets	(3,993,365)	(3,361,384)	(3,993,365)	(3,361,384)	(3,657,242)
Exploration and Production [member] | Capitalized Refined Products [member]
Disclosure of operating segments [line items]
Total consolidated operating income (loss)			(263,624)	(137,708)
Total consolidated net (loss) income			(263,624)	(137,708)
Total consolidated assets	(263,624)	(137,708)	(263,624)	(137,708)	(574,381)
Exploration and Production [member] | Amortization of Capitalized Interest [member]
Disclosure of operating segments [line items]
Total consolidated operating income (loss)			59,491	59,491
Total consolidated net (loss) income			59,491	59,491
Total consolidated assets	59,491	59,491	59,491	59,491	118,981
Exploration and Production [member] | Depreciation of Revaluated Assets [member]
Disclosure of operating segments [line items]
Total consolidated assets	(23,160,662)	(22,250,279)	(23,160,662)	(22,250,279)	(22,503,168)
Exploration and Production [member] | Equity Method Elimination [member]
Disclosure of operating segments [line items]
Total consolidated net (loss) income			(20,913)	60,626
Total consolidated assets	(780,537)	(681,429)	(780,537)	(681,429)	(759,624)
Industrial Transformation [member]
Disclosure of operating segments [line items]
Total consolidated sales			567,790,323	489,659,039
Total consolidated operating income (loss)			(18,550,175)	(54,261,261)
Total consolidated net (loss) income			(16,276,121)	(37,765,457)
Total consolidated assets	519,391,505	771,049,731	519,391,505	771,049,731	857,196,306
Total consolidated liabilities	755,563,795	979,866,886	755,563,795	979,866,886	1,077,108,748
Industrial Transformation [member] | By segment [member]
Disclosure of operating segments [line items]
Total consolidated sales			568,641,592	490,816,991
Total consolidated operating income (loss)			(133,275)	(51,285,496)
Total consolidated net (loss) income			2,862,326	(34,979,887)
Total consolidated assets	594,079,464	1,138,758,388	594,079,464	1,138,758,388	912,770,881
Total consolidated liabilities	759,983,725	1,304,436,598	759,983,725	1,304,436,598	1,081,528,677
Industrial Transformation [member] | unrealized Intersegment Sales [member]
Disclosure of operating segments [line items]
Total consolidated sales			(851,269)	(1,157,952)
Total consolidated operating income (loss)			(851,269)	(1,157,952)
Total consolidated net (loss) income			(851,269)	(1,157,952)
Total consolidated assets	(6,241,247)	(5,324,176)	(6,241,247)	(5,324,176)	(5,389,977)
Total consolidated liabilities	(4,419,930)	(4,419,930)	(4,419,930)	(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 income (loss)			(17,565,631)	(1,817,814)
Total consolidated net (loss) income			(17,565,631)	(1,817,814)
Total consolidated assets	(59,944,861)	(35,179,252)	(59,944,861)	(35,179,252)	(42,379,229)
Industrial Transformation [member] | Amortization of Capitalized Interest [member]
Disclosure of operating segments [line items]
Total consolidated assets	8,123	8,123	8,123	8,123	8,123
Industrial Transformation [member] | Equity Method Elimination [member]
Disclosure of operating segments [line items]
Total consolidated net (loss) income			(721,547)	190,197
Total consolidated assets	(8,509,974)	(7,063,571)	(8,509,974)	(7,063,571)	(7,813,492)
Cogeneration and Services [member]
Disclosure of operating segments [line items]
Total consolidated sales				60,037
Total consolidated operating income (loss)			1,788	(31,418)
Total consolidated net (loss) income			1,789	(42,950)
Total consolidated assets		373,087		373,087	179,807
Total consolidated liabilities		692,443		692,443	531,580
Cogeneration and Services [member] | By segment [member]
Disclosure of operating segments [line items]
Total consolidated sales				60,037
Total consolidated operating income (loss)			1,788	(31,418)
Total consolidated net (loss) income			1,789	(139,629)
Total consolidated assets		319,675		319,675	179,807
Total consolidated liabilities		692,443		692,443	531,580
Cogeneration and Services [member] | Equity Method Elimination [member]
Disclosure of operating segments [line items]
Total consolidated net (loss) income				96,679
Total consolidated assets		53,411		53,411
Drilling and Services [member]
Disclosure of operating segments [line items]
Total consolidated sales			2,238,029	1,679,250
Total consolidated operating income (loss)			(1,107,942)	(1,560,476)
Total consolidated net (loss) income			(969,782)	(1,057,025)
Total consolidated assets	27,119,590	23,633,374	27,119,590	23,633,374	26,220,748
Total consolidated liabilities	15,587,610	13,816,296	15,587,610	13,816,296	13,886,424
Drilling and Services [member] | By segment [member]
Disclosure of operating segments [line items]
Total consolidated sales			3,651,556	2,761,289
Total consolidated operating income (loss)			(380,095)	(1,771,044)
Total consolidated net (loss) income			(493,393)	(1,267,592)
Total consolidated assets	29,277,969	26,583,936	29,277,969	26,583,936	28,256,876
Total consolidated liabilities	14,700,897	13,318,729	14,700,897	13,318,729	13,186,297
Drilling and Services [member] | unrealized Intersegment Sales [member]
Disclosure of operating segments [line items]
Total consolidated sales			(1,413,527)	(1,082,039)
Total consolidated operating income (loss)			(1,413,527)	(1,082,039)
Total consolidated net (loss) income			(1,413,527)	(1,082,039)
Total consolidated liabilities	886,713	497,567	886,713	497,567	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 income (loss)			388,751	980,327
Total consolidated net (loss) income			388,751	980,327
Drilling and Services [member] | Depreciation of Revaluated Assets [member]
Disclosure of operating segments [line items]
Total consolidated operating income (loss)			296,929	312,280
Total consolidated net (loss) income			548,387	312,280
Total consolidated assets	(2,158,379)	(2,950,563)	(2,158,379)	(2,950,563)	(2,036,128)
Logistics [member]
Disclosure of operating segments [line items]
Total consolidated sales			34,508,587	47,415,890
Total consolidated operating income (loss)			(4,491,254)	22,214,892
Total consolidated net (loss) income			2,004,372	18,449,719
Total consolidated assets	179,211,676	179,130,478	179,211,676	179,130,478	191,895,993
Total consolidated liabilities	40,684,421	26,070,184	40,684,421	26,070,184	56,706,251
Logistics [member] | By segment [member]
Disclosure of operating segments [line items]
Total consolidated sales			34,508,587	47,415,890
Total consolidated operating income (loss)			(2,481,028)	18,769,749
Total consolidated net (loss) income			2,417,967	15,004,575
Total consolidated assets	263,496,192	299,475,440	263,496,192	299,475,440	276,537,764
Total consolidated liabilities	40,684,421	26,070,184	40,684,421	26,070,184	56,706,251
Logistics [member] | unrealized Intersegment Sales [member]
Disclosure of operating segments [line items]
Total consolidated assets	7,184	7,184	7,184	7,184	7,183
Logistics [member] | Depreciation of Revaluated Assets [member]
Disclosure of operating segments [line items]
Total consolidated operating income (loss)			(2,010,226)	3,445,143
Total consolidated net (loss) income			(413,906)	3,445,143
Total consolidated assets	(84,205,024)	(120,352,146)	(84,205,024)	(120,352,146)	(84,557,831)
Logistics [member] | Equity Method Elimination [member]
Disclosure of operating segments [line items]
Total consolidated net (loss) income			311
Total consolidated assets	(86,676)		(86,676)		(91,123)
Fertilizers [member]
Disclosure of operating segments [line items]
Total consolidated sales			2,822,309	2,343,664
Total consolidated operating income (loss)			(3,139,753)	(814,900)
Total consolidated net (loss) income			(3,336,956)	(873,803)
Total consolidated assets	5,675,237	8,666,191	5,675,237	8,666,191	8,923,456
Total consolidated liabilities	6,640,994	2,998,974	6,640,994	2,998,974	6,556,050
Fertilizers [member] | By segment [member]
Disclosure of operating segments [line items]
Total consolidated sales			2,822,309	2,380,931
Total consolidated operating income (loss)			(3,317,231)	(956,346)
Total consolidated net (loss) income			(3,911,486)	8,506,409
Total consolidated assets	10,541,420	17,670,356	10,541,420	17,670,356	17,689,305
Total consolidated liabilities	6,640,994	2,998,974	6,640,994	2,998,974	6,556,050
Fertilizers [member] | unrealized Intersegment Sales [member]
Disclosure of operating segments [line items]
Total consolidated sales				(37,267)
Total consolidated operating income (loss)				(37,267)
Total consolidated net (loss) income				(37,267)
Total consolidated assets	(26,886)		(26,886)
Fertilizers [member] | unrealized Gain due to Production Cost Valuation of Inventory [member]
Disclosure of operating segments [line items]
Total consolidated assets		(37,267)		(37,267)	(26,886)
Fertilizers [member] | Depreciation of Revaluated Assets [member]
Disclosure of operating segments [line items]
Total consolidated operating income (loss)			177,478	178,715
Total consolidated net (loss) income			177,478	178,715
Total consolidated assets	(1,980,175)	(5,121,329)	(1,980,175)	(5,121,329)	(2,165,068)
Fertilizers [member] | Equity Method Elimination [member]
Disclosure of operating segments [line items]
Total consolidated net (loss) income			397,052	(9,521,659)
Total consolidated assets	(2,859,122)	(3,845,568)	(2,859,122)	(3,845,568)	(6,573,895)
Ethylene [member]
Disclosure of operating segments [line items]
Total consolidated sales			7,273,855	7,078,657
Total consolidated operating income (loss)			(720,516)	(589,637)
Total consolidated net (loss) income			(744,824)	(562,317)
Total consolidated assets	22,917,849	23,414,242	22,917,849	23,414,242	23,142,045
Total consolidated liabilities	2,846,006	1,870,963	2,846,006	1,870,963	2,308,890
Ethylene [member] | By segment [member]
Disclosure of operating segments [line items]
Total consolidated sales			7,273,855	7,078,657
Total consolidated operating income (loss)			(1,340,824)	(1,273,795)
Total consolidated net (loss) income			(1,069,148)	(1,147,445)
Total consolidated assets	32,133,052	36,369,522	32,133,052	36,369,522	35,498,783
Total consolidated liabilities	2,846,006	1,870,963	2,846,006	1,870,963	2,308,890
Ethylene [member] | unrealized Intersegment Sales [member]
Disclosure of operating segments [line items]
Total consolidated assets	(5,304)	(5,304)	(5,304)	(5,304)	(5,303)
Ethylene [member] | Depreciation of Revaluated Assets [member]
Disclosure of operating segments [line items]
Total consolidated operating income (loss)			620,308	684,156
Total consolidated net (loss) income			620,308	684,156
Total consolidated assets	(8,902,379)	(12,061,980)	(8,902,379)	(12,061,980)	(9,522,686)
Ethylene [member] | Equity Method Elimination [member]
Disclosure of operating segments [line items]
Total consolidated net (loss) income			(295,984)	(99,030)
Total consolidated assets	(307,520)	(887,998)	(307,520)	(887,998)	(2,828,749)
Trading Companies [member]
Disclosure of operating segments [line items]
Total consolidated sales			425,588,540	483,349,357
Total consolidated operating income (loss)			7,714,078	208,361
Total consolidated net (loss) income			2,521,670	(1,011,449)
Total consolidated assets	177,847,795	132,925,292	177,847,795	132,925,292	186,808,899
Total consolidated liabilities	105,534,647	68,760,183	105,534,647	68,760,183	116,842,881
Trading Companies [member] | By segment [member]
Disclosure of operating segments [line items]
Total consolidated sales			425,642,969	483,379,785
Total consolidated operating income (loss)			8,112,877	130,103
Total consolidated net (loss) income			2,920,468	(1,089,708)
Total consolidated assets	187,936,000	142,127,674	187,936,000	142,127,674	195,538,239
Total consolidated liabilities	106,245,862	68,454,797	106,245,862	68,454,797	116,648,398
Trading Companies [member] | unrealized Intersegment Sales [member]
Disclosure of operating segments [line items]
Total consolidated sales			(54,429)	(30,428)
Total consolidated operating income (loss)			(54,429)	(30,428)
Total consolidated net (loss) income			(54,429)	(30,428)
Total consolidated assets	(462,489)	(362,958)	(462,489)	(362,958)	(408,059)
Total consolidated liabilities	(711,215)	305,387	(711,215)	305,387	194,483
Trading Companies [member] | unrealized Gain due to Production Cost Valuation of Inventory [member]
Disclosure of operating segments [line items]
Total consolidated operating income (loss)			(344,369)	108,686
Total consolidated net (loss) income			(344,369)	108,686
Total consolidated assets	(8,465,262)	(6,711,506)	(8,465,262)	(6,711,506)	(7,163,664)
Trading Companies [member] | Depreciation of Revaluated Assets [member]
Disclosure of operating segments [line items]
Total consolidated assets	(424,850)	(424,850)	(424,850)	(424,850)	(424,849)
Trading Companies [member] | Equity Method Elimination [member]
Disclosure of operating segments [line items]
Total consolidated net (loss) income			1
Total consolidated assets	(735,604)	(1,703,068)	(735,604)	(1,703,068)	(732,768)
Corporate and Other Operating Subsidiary Companies [member]
Disclosure of operating segments [line items]
Total consolidated sales			52,154,770	37,529,927
Total consolidated operating income (loss)			(5,467,467)	(5,746,718)
Total consolidated net (loss) income			(47,929,561)	122,748,344
Total consolidated assets	2,159,248,411	2,202,326,329	2,159,248,411	2,202,326,329	2,111,740,735
Total consolidated liabilities	3,675,558,718	3,287,511,886	3,675,558,718	3,287,511,886	3,587,988,972
Corporate and Other Operating Subsidiary Companies [member] | By segment [member]
Disclosure of operating segments [line items]
Total consolidated sales			52,154,770	37,529,927
Total consolidated operating income (loss)			(5,467,467)	(5,746,720)
Total consolidated net (loss) income			(47,929,561)	122,748,339
Total consolidated assets	2,159,248,410	2,202,326,329	2,159,248,410	2,202,326,329	2,111,740,735
Total consolidated liabilities	$ 3,675,558,718	$ 3,287,511,886	$ 3,675,558,718	$ 3,287,511,886	$ 3,587,988,972

Revenue - Schedule of Revenue D

Revenue - Schedule of Revenue Disaggregation (Detail) - MXN ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Products transferred at point in time [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	$ 821,308,095	$ 666,582,237
Products and services transferred over time [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	12,261,947	2,353,130
Crude oil [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	235,689,465	154,608,402
Gas [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	77,480,253	80,691,585
Refined petroleum products [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	511,121,677	423,404,683
Other products [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	4,991,156	4,809,591
Services [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	4,287,491	5,421,106
UNITED STATES
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	198,496,665	151,607,852
Other [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	86,928,508	52,766,388
Europe [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	48,239,787	29,028,786
Local Country [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	499,905,082	435,532,341
Exploration and Production [member] | Products transferred at point in time [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	235,689,465	154,120,559
Exploration and Production [member] | Crude oil [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	235,689,465	154,120,559
Exploration and Production [member] | UNITED STATES
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	121,163,393	85,484,898
Exploration and Production [member] | Other [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	69,086,931	40,199,137
Exploration and Production [member] | Europe [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	45,439,141	28,436,524
Industrial Transformation [member] | Products transferred at point in time [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	482,053,745	421,761,648
Industrial Transformation [member] | Gas [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	54,742,573	60,040,711
Industrial Transformation [member] | Refined petroleum products [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	425,632,977	357,357,083
Industrial Transformation [member] | Other products [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	1,315,231	1,310,725
Industrial Transformation [member] | Services [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	362,964	3,053,129
Industrial Transformation [member] | Local Country [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	482,053,745	421,761,648
Cogeneration and Services [member] | Products and services transferred over time [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers		38,554
Cogeneration and Services [member] | Services [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers		38,554
Cogeneration and Services [member] | Local Country [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers		38,554
Drilling and Services [member] | Products and services transferred over time [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	25,156	12,852
Drilling and Services [member] | Services [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	25,156	12,852
Drilling and Services [member] | Local Country [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	25,156	12,852
Logistics [member] | Products and services transferred over time [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	2,489,437	1,776,303
Logistics [member] | Services [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	2,489,437	1,776,303
Logistics [member] | Local Country [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	2,489,437	1,776,303
Fertilizers [member] | Products transferred at point in time [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers		2,292,364
Fertilizers [member] | Products and services transferred over time [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	1,775,923
Fertilizers [member] | Refined petroleum products [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	1,773,975	2,290,876
Fertilizers [member] | Services [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	1,948	1,488
Fertilizers [member] | Local Country [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	1,775,923	2,292,364
Ethylene [member] | Products transferred at point in time [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers		6,125,896
Ethylene [member] | Products and services transferred over time [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	6,569,023
Ethylene [member] | Refined petroleum products [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	6,563,445	6,112,537
Ethylene [member] | Services [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	5,578	13,359
Ethylene [member] | Local Country [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	6,569,023	6,125,896
Trading Companies [member] | Products transferred at point in time [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	101,552,867	80,643,099
Trading Companies [member] | Products and services transferred over time [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	35,822	42,108
Trading Companies [member] | Crude oil [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers		487,843
Trading Companies [member] | Gas [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	22,737,680	20,650,874
Trading Companies [member] | Refined petroleum products [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	77,151,280	57,644,187
Trading Companies [member] | Other products [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	1,663,907	1,860,196
Trading Companies [member] | Services [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	35,822	42,107
Trading Companies [member] | UNITED STATES
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	77,333,272	66,122,954
Trading Companies [member] | Other [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	17,841,577	12,567,251
Trading Companies [member] | Europe [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	1,488,060	592,262
Trading Companies [member] | Local Country [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	4,925,780	1,402,740
Corporate and Other Operating Subsidiary Companies [member] | Products transferred at point in time [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	2,012,018	1,638,671
Corporate and Other Operating Subsidiary Companies [member] | Products and services transferred over time [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	1,366,586	483,313
Corporate and Other Operating Subsidiary Companies [member] | Other products [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	2,012,018	1,638,670
Corporate and Other Operating Subsidiary Companies [member] | Services [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	1,366,586	483,314
Corporate and Other Operating Subsidiary Companies [member] | Europe [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	1,312,586
Corporate and Other Operating Subsidiary Companies [member] | Local Country [member]
Disclosure of disaggregation of revenue from contracts with customers [line items]
Revenue from contracts with customers	$ 2,066,018	$ 2,121,984

Cash, Cash Equivalents and Rest

Cash, Cash Equivalents and Restricted Cash - Summary of Cash and Cash Equivalents (Detail) - MXN ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
Cash and cash equivalents [abstract]
Cash on hand and in banks	$ 67,735,427	$ 55,871,127
Highly liquid investments	41,771,284	41,980,627
Cash and cash equivalents	$ 109,506,711	$ 97,851,754	$ 110,530,917	$ 163,532,513

Accounts Receivable, Net - Summ

Accounts Receivable, Net - Summary of Accounts Receivable and Other Receivables (Detail) - MXN ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Trade and Other Receivables [Line Items]
Accounts receivable, net	$ 171,537,070	$ 170,645,234
Domestic customers [member]
Trade and Other Receivables [Line Items]
Accounts receivable, net	55,402,470	60,057,141
Export customers [member]
Trade and Other Receivables [Line Items]
Accounts receivable, net	56,626,963	54,428,883
Sundry debtors [member]
Trade and Other Receivables [Line Items]
Accounts receivable, net	44,402,034	26,105,703
Taxes recovered and prepaid taxes [member]
Trade and Other Receivables [Line Items]
Accounts receivable, net	7,539,947	23,039,023
Employees and officers [member]
Trade and Other Receivables [Line Items]
Accounts receivable, net	6,035,862	5,681,478
Advances to suppliers [member]
Trade and Other Receivables [Line Items]
Accounts receivable, net	867,742	1,250,846
Other accounts receivable [member]
Trade and Other Receivables [Line Items]
Accounts receivable, net	$ 662,052	$ 82,160

Inventories, Net - Summary of I

Inventories, Net - Summary of Inventories (Detail) - MXN ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Disclosure of Inventories [Line Items]
Inventories	$ 53,325,822	$ 63,858,930
Refined and petrochemicals products [member]
Disclosure of Inventories [Line Items]
Inventories	24,490,269	27,862,384
Products in transit [member]
Disclosure of Inventories [Line Items]
Inventories	13,589,457	19,112,606
Crude oil [member]
Disclosure of Inventories [Line Items]
Inventories	9,602,571	11,445,780
Materials and products in stock [member]
Disclosure of Inventories [Line Items]
Inventories	5,050,152	5,172,779
Materials in transit [member]
Disclosure of Inventories [Line Items]
Inventories	492,262	180,711
Gas and condesate products [member]
Disclosure of Inventories [Line Items]
Inventories	$ 101,111	$ 84,670

Equity Instruments - Additional

Equity Instruments - Additional Information (Detail) - MXN ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Disclosure of detailed information about financial instruments [abstract]
Equity instruments	$ 1,056,968
Available-for-sale current non-financial assets		$ 1,056,968

Investments in Joint Ventures_3

Investments in Joint Ventures and Associates - Schedule of Investments in Joint Ventures and Associates (Detail) - MXN ($) $ in Thousands	9 Months Ended
	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items]
Permanent investments in associates	$ 16,938,755	$ 16,707,364	$ 21,023,163
Deer Park Refining Limited [member]
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items]
Permanent investments in associates	$ 14,770,797	14,405,542
Percentage of investment	49.99%
Frontera Brownsville, LLC. [member]
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items]
Permanent investments in associates	$ 485,543	471,085
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	$ 142,121	315,713
Percentage of investment	50.00%
Texas Frontera, LLC. [member]
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items]
Permanent investments in associates	$ 234,775	239,782
Percentage of investment	35.00%
Sierrita Gas Pipeline LLC [member]
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items]
Permanent investments in associates	$ 1,052,163	1,084,169
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	$ 124,423	64,328
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	$ 49,057	45,133
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	$ 17,783	18,336
Percentage of investment	30.00%
Other-net [member]
Disclosure of Investments in Subsidiaries Joint Ventures and Associates [Line items]
Permanent investments in associates	$ 62,093	$ 63,276

Investments in Joint Ventures_4

Investments in Joint Ventures and Associates - Schedule Profit (loss) Sharing in Joint Ventures and Associates (Detail) - MXN ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Disclosure of Investments in Associates and Other [Line Items]
Profit (loss) sharing in joint ventures and associates, net	$ 562,949	$ 633,427	$ 848,136	$ 874,954
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			291,739	92,089
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			60,095	30,869
Sierrita Gas Pipeline LLC [member]
Disclosure of Investments in Associates and Other [Line Items]
Profit (loss) sharing in joint ventures and associates, net			56,422	54,820
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			3,707	4,623
Other-net [member]
Disclosure of Investments in Associates and Other [Line Items]
Profit (loss) sharing in joint ventures and associates, net			60,502	57,401
Deer Park Refining Limited [member]
Disclosure of Investments in Associates and Other [Line Items]
Profit (loss) sharing in joint ventures and associates, net			$ 375,671	626,254
CH4 Energia, S. A. [member]
Disclosure of Investments in Associates and Other [Line Items]
Profit (loss) sharing in joint ventures and associates, net				$ 8,898

Investments in Joint Ventures_5

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

Investments in Joint Ventures,

Investments in Joint Ventures, Associates and Other - Additional Information (Detail)	1 Months Ended		12 Months Ended
	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
Number of barrels in each tanks			120,000
Texas Frontera, LLC. [member] | PMI SUS [member]
Disclosure of Investments in Associates and Other [Line Items]
Acquired percentage	50.00%

Wells, Pipelines, Properties,_3

Wells, Pipelines, Properties, Plant and Equipment, Net - Detailed Information About Property, Plant and Equipment (Detail) - MXN ($) $ in Thousands	6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	$ 1,436,509,326
Acquisitions	34,845,630	$ 35,710,718	$ 93,979,818
Ending balance	$ 1,430,223,825	1,622,632,585	1,436,509,326
Estimated useful lives	-
Carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	$ 3,155,845,995	3,268,797,613	3,268,797,613
Acquisitions	34,845,630		93,979,818
Reclassifications	(1,389,359)		(3,920,974)
Impairment	42,360,452		(151,444,560)
Disposals	(17,591,990)		(51,565,902)
Ending balance	3,214,070,728		3,155,845,995
Accumulated depreciation and amortization [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	(1,719,336,669)	(1,601,055,365)	(1,601,055,365)
Depreciation and amortization	(73,733,715)		(156,704,513)
Reclassifications	1,389,359		3,920,978
Disposals	7,834,122		34,502,231
Ending balance	(1,783,846,903)		(1,719,336,669)
Plants [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	62,001,213
Ending balance	352,982,383		62,001,213
Plants [member] | Carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	756,025,360	758,446,110	758,446,110
Acquisitions	4,297,491		10,018,030
Reclassifications	1,335,376		3,146,955
Capitalization	272,222		43,033,864
Impairment	6,886,753		(48,020,616)
Disposals	(3,242,791)		(10,598,983)
Ending balance	765,574,411		756,025,360
Plants [member] | Accumulated depreciation and amortization [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	(394,024,147)	(360,016,979)	(360,016,979)
Depreciation and amortization	(19,911,542)		(45,709,123)
Reclassifications	(244,470)		2,799,244
Disposals	1,588,131		8,902,711
Ending balance	$ (412,592,028)		(394,024,147)
Plants [member] | Bottom of range [member]
Disclosure of detailed information about property, plant and equipment [line items]
Depreciation rates	3.00%
Estimated useful lives	20 Years
Plants [member] | Top of range [member]
Disclosure of detailed information about property, plant and equipment [line items]
Depreciation rates	5.00%
Estimated useful lives	35 Years
Drilling equipment [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	$ 18,429,132
Ending balance	$ 17,022,274		18,429,132
Depreciation rates	5.00%
Estimated useful lives	20 Years
Drilling equipment [member] | Carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	$ 23,443,116	23,269,116	23,269,116
Acquisitions	305,607		418,283
Disposals	(897,685)		(244,283)
Ending balance	22,851,038		23,443,116
Drilling equipment [member] | Accumulated depreciation and amortization [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	(5,013,984)	(2,942,575)	(2,942,575)
Depreciation and amortization	(1,078,808)		(2,198,867)
Disposals	264,028		127,458
Ending balance	(5,828,764)		(5,013,984)
Pipelines [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	321,908,762
Ending balance	312,230,541		321,908,762
Pipelines [member] | Carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	481,868,176	460,145,428	460,145,428
Acquisitions	482,014		7,054,793
Reclassifications	(1,969,381)		(53,349)
Capitalization	1,140,129		21,357,074
Impairment	(1,481,865)		2,226,771
Disposals	(426,983)		(8,862,541)
Ending balance	479,612,090		481,868,176
Pipelines [member] | Accumulated depreciation and amortization [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	(159,959,414)	(152,365,227)	(152,365,227)
Depreciation and amortization	(7,808,357)		(15,095,115)
Reclassifications	224,869		(72,841)
Disposals	161,353		7,573,769
Ending balance	$ (167,381,549)		(159,959,414)
Pipelines [member] | Bottom of range [member]
Disclosure of detailed information about property, plant and equipment [line items]
Depreciation rates	2.00%
Estimated useful lives	15 Years
Pipelines [member] | Top of range [member]
Disclosure of detailed information about property, plant and equipment [line items]
Depreciation rates	7.00%
Estimated useful lives	45 Years
Wells [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	$ 359,348,274
Ending balance	$ 369,000,240		359,348,274
Estimated useful lives	-
Wells [member] | Carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	$ 1,267,747,910	1,318,822,917	1,318,822,917
Acquisitions	9,621,436		14,937,882
Capitalization	7,538,411		36,564,811
Impairment	30,832,289		(83,236,991)
Disposals	(8,297,844)		(19,340,709)
Ending balance	1,307,442,202		1,267,747,910
Wells [member] | Accumulated depreciation and amortization [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	(908,399,636)	(850,536,754)	(850,536,754)
Depreciation and amortization	(35,229,793)		(74,673,473)
Disposals	5,187,467		16,810,591
Ending balance	(938,441,962)		(908,399,636)
Buildings [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	23,659,462
Ending balance	22,012,780		23,659,462
Buildings [member] | Carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	64,700,471	62,743,033	62,743,033
Acquisitions	167,620		802,300
Reclassifications	(12,140)		98,245
Capitalization	99,766		1,265,246
Impairment	(835,859)
Disposals	(242,061)		(208,353)
Ending balance	63,877,797		64,700,471
Buildings [member] | Accumulated depreciation and amortization [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	(41,041,009)	(39,124,631)	(39,124,631)
Depreciation and amortization	(933,896)		(1,906,164)
Reclassifications	19,614		(69,236)
Disposals	90,274		59,022
Ending balance	$ (41,865,017)		(41,041,009)
Buildings [member] | Bottom of range [member]
Disclosure of detailed information about property, plant and equipment [line items]
Depreciation rates	3.00%
Estimated useful lives	33 Years
Buildings [member] | Top of range [member]
Disclosure of detailed information about property, plant and equipment [line items]
Depreciation rates	7.00%
Estimated useful lives	35 Years
Offshore platforms [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	$ 148,222,706
Ending balance	$ 148,034,390		148,222,706
Depreciation rates	4.00%
Estimated useful lives	25 Years
Offshore platforms [member] | Carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	$ 313,429,941	322,704,205	322,704,205
Acquisitions	2,074,119		7,811,374
Reclassifications	(4,039,499)		(10,199,213)
Capitalization			8,677,765
Impairment	7,310,570		(15,564,190)
Ending balance	318,775,131		313,429,941
Offshore platforms [member] | Accumulated depreciation and amortization [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	(165,207,235)	(153,161,770)	(153,161,770)
Depreciation and amortization	(6,877,975)		(13,192,369)
Reclassifications	1,344,469		1,146,904
Ending balance	(170,740,741)		(165,207,235)
Furniture and equipment [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	12,084,714
Ending balance	10,938,249		12,084,714
Furniture and equipment [member] | Carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	51,057,652	50,746,687	50,746,687
Acquisitions	283,073		1,183,679
Reclassifications	(44,167)		(96,899)
Capitalization			30,879
Disposals	(407,078)		(806,694)
Ending balance	50,889,480		51,057,652
Furniture and equipment [member] | Accumulated depreciation and amortization [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	(38,972,938)	(36,990,666)	(36,990,666)
Depreciation and amortization	(1,411,430)		(2,890,563)
Reclassifications	65,719		102,375
Disposals	367,418		805,916
Ending balance	$ (39,951,231)		(38,972,938)
Furniture and equipment [member] | Bottom of range [member]
Disclosure of detailed information about property, plant and equipment [line items]
Depreciation rates	3.00%
Estimated useful lives	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%
Estimated useful lives	10 Years
Transportation equipment [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	$ 16,453,330
Ending balance	15,660,036		16,453,330
Transportation equipment [member] | Carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	23,171,636	19,442,845	19,442,845
Acquisitions	107,284		284,445
Reclassifications	20,915		(75,674)
Capitalization	206,896		3,746,395
Disposals	(801,084)		(226,375)
Ending balance	22,705,647		23,171,636
Transportation equipment [member] | Accumulated depreciation and amortization [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	(6,718,306)	(5,916,763)	(5,916,763)
Depreciation and amortization	(481,914)		(1,038,839)
Reclassifications	(20,842)		14,532
Disposals	175,451		222,764
Ending balance	$ (7,045,611)		(6,718,306)
Transportation equipment [member] | Bottom of range [member]
Disclosure of detailed information about property, plant and equipment [line items]
Depreciation rates	4.00%
Estimated useful lives	5 Years
Transportation equipment [member] | Top of range [member]
Disclosure of detailed information about property, plant and equipment [line items]
Depreciation rates	20.00%
Estimated useful lives	25 Years
Construction in progress [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	$ 129,736,382
Ending balance	$ 137,684,200		129,736,382
Estimated useful lives	-
Construction in progress [member] | Carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	$ 129,736,382	207,414,148	207,414,148
Acquisitions	17,214,414		51,410,469
Reclassifications	600,671		(812,943)
Capitalization	(9,257,424)		(114,700,828)
Impairment	(351,436)		(6,849,534)
Disposals	(258,407)		(6,724,930)
Ending balance	137,684,200		129,736,382
Land [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	44,546,699
Ending balance	$ 44,540,950		44,546,699
Estimated useful lives	-
Land [member] | Carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	$ 44,546,699	44,571,618	44,571,618
Acquisitions	292,678		58,563
Reclassifications	12,119		(560)
Capitalization			29,248
Disposals	(310,546)		(112,170)
Ending balance	$ 44,540,950		44,546,699
Unproductive fixed assets [member]
Disclosure of detailed information about property, plant and equipment [line items]
Estimated useful lives	-
Unproductive fixed assets [member] | Carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Acquisitions	$ (106)
Reclassifications	2,707,617
Disposals	(2,707,511)
Other Fixed Assets [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	118,651
Ending balance	$ 117,782		118,651
Estimated useful lives	-
Other Fixed Assets [member] | Carrying amount [member]
Disclosure of detailed information about property, plant and equipment [line items]
Beginning balance	$ 118,652	$ 491,506	491,506
Reclassifications	(870)		4,072,464
Capitalization			(4,454)
Disposals			(4,440,864)
Ending balance	$ 117,782		$ 118,652

Wells, Pipelines, Properties,_4

Wells, Pipelines, Properties, Plant and Equipment, Net - Detailed Information About Property, Plant and Equipment (Parenthetical) (Detail) - MXN ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Disclosure of detailed information about property, plant and equipment [line items]
Depreciation and amortization	$ 73,733,715	$ 73,422,650
Plugging and abandonment cost	528,541	419,869
Provisions for plugging wells	73,160,276		$ 68,797,600
Net reversal of impairment	(42,360,452)
Pemex exploration and production [member]
Disclosure of detailed information about property, plant and equipment [line items]
Financing cost	$ 1,033,422	$ 1,890,312

Wells, Pipelines, Properties,_5

Wells, Pipelines, Properties, Plant and Equipment, Net - Summary of Net Impairment (Detail) - MXN ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Disclosure of detailed information about property, plant and equipment [line items]
Impairment			$ (15,142,391)
Reversal of impairment			57,502,843
Reversal of impairment / (Impairment)	$ 23,322,073	$ 18,927,912	42,360,452	$ (3,401,410)
Pemex exploration and production [member]
Disclosure of detailed information about property, plant and equipment [line items]
Impairment			(1,459,374)
Reversal of impairment			38,170,777
Reversal of impairment / (Impairment)			36,711,403
Pemex Fertilizers [member]
Disclosure of detailed information about property, plant and equipment [line items]
Impairment			(2,154,016)
Reversal of impairment / (Impairment)			(2,154,016)
Pemex industrial transformation [member]
Disclosure of detailed information about property, plant and equipment [line items]
Impairment			(11,529,001)
Reversal of impairment			19,332,066
Reversal of impairment / (Impairment)			$ 7,803,065

Wells, Pipelines, Properties,_6

Wells, Pipelines, Properties, Plant and Equipment, Net - Additional Information (Detail) $ in Thousands, Barrels_per_day in Millions	3 Months Ended			6 Months Ended		12 Months Ended
	Jun. 30, 2018MXN ($)Barrels_per_day	Dec. 31, 2017	Jun. 30, 2017MXN ($)	Jun. 30, 2018MXN ($)Barrels_per_dayExchange_Rate	Jun. 30, 2017MXN ($)	Dec. 31, 2017
Disclosure of detailed information about property, plant and equipment [line items]
Reversal of impairment / (Impairment)	$ 23,322,073		$ 18,927,912	$ 42,360,452	$ (3,401,410)
Reversal of impairment				57,502,843
Impairment				(15,142,391)
Cash generating units of fertilizers [member]
Disclosure of detailed information about property, plant and equipment [line items]
Impairment				$ 2,154,016
Discount rate				9.33%
Pemex exploration and production [member]
Disclosure of detailed information about property, plant and equipment [line items]
Reversal of impairment / (Impairment)				$ 36,711,403
Reversal of impairment				$ 38,170,777
Percentage increase in crude oil price				9.30%
Crude oil price per unit	61.08	55.89		61.08		55.89
Impairment				$ (1,459,374)
Percentage decrease in gas price				15.20%
Gas price per unit	4.17	4.92		4.17		4.92
Percentage of increase in discount rate		2.00%
Useful life				25 years
Production forecast | Barrels_per_day	6,625			6,625
Pemex industrial transformation [member]
Disclosure of detailed information about property, plant and equipment [line items]
Reversal of impairment / (Impairment)				$ 7,803,065
Reversal of impairment				19,332,066
Impairment				$ (11,529,001)
Foreign exchange rate | Exchange_Rate				19.8633
Pemex industrial transformation [member] | Refined petroleum products [member]
Disclosure of detailed information about property, plant and equipment [line items]
Percentage of increase in discount rate						0.20%
Pemex industrial transformation [member] | Gas [member]
Disclosure of detailed information about property, plant and equipment [line items]
Percentage of increase in discount rate						5.00%
Pemex industrial transformation [member] | Aromatics [member]
Disclosure of detailed information about property, plant and equipment [line items]
Percentage of increase in discount rate						0.30%

Wells, Pipelines, Properties,_7

Wells, Pipelines, Properties, Plant and Equipment, Net - Assumptions to Determine Net Present Value of Reserves Long Lived Assets (Detail) - 6 months ended Jun. 30, 2018	USD ($)Exchange_Rate	MXN ($)
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Useful lives of the cash generating units	-
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	19.8633
Pemex exploration and production [member]
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Average crude oil price	$ 61.08
Average gas price	4.17
Average condensates price	$ 36.85
Discount rate	14.72%
Gas [member] | Pemex industrial transformation [member]
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Processed volume		$ 3,085
Rate of U.S. dollar | Exchange_Rate	19.8633
Useful lives of the cash generating units	Average 8 years
Discount rate	10.82%
Period	2019-2029
Petrochemicals [member] | 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	19.8633
Useful lives of the cash generating units	Average 7 years
Discount rate	9.33%
Period	2019-2024
Refining [member] | Pemex industrial transformation [member]
Disclosure of significant unobservable inputs used in fair value measurement of assets [line items]
Average crude oil price	$ 52.3
Processed volume		$ 1,100
Rate of U.S. dollar | Exchange_Rate	19.8633
Useful lives of the cash generating units	Average 14 years
Discount rate	11.76%
Period	2019-2034

Wells, pipelines, properties,_8

Wells, pipelines, properties, plant and equipment, net - Summary of Impairment in Cash Generating Units (Detail) - MXN ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]
Reversal of impairment			$ 57,502,843
Impairment			(15,142,391)
Reversal of impairment / (Impairment)	$ 23,322,073	$ 18,927,912	42,360,452	$ (3,401,410)
Pemex industrial transformation [member]
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]
Reversal of impairment			19,332,066
Impairment			(11,529,001)
Reversal of impairment / (Impairment)			7,803,065
Pemex industrial transformation [member] | Minatitln Refinery [member]
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]
Reversal of impairment			10,851,186
Pemex industrial transformation [member] | Madero refinery [member]
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]
Reversal of impairment			8,480,880
Pemex industrial transformation [member] | Salina Cruz Refinery [member]
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]
Impairment			$ (11,529,001)

Wells, pipelines, properties,_9

Wells, pipelines, properties, plant and equipment, net - Summary of Impairment or Reversal of Impairment of Fixed Assets (Detail) - Pemex industrial transformation [member] $ in Thousands	6 Months Ended
	Jun. 30, 2018MXN ($)
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items]
Impairment or reversal of impairment of fixed assets	$ 62,134,179
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	41,290,257
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	$ 20,843,922

Intangible Assets - Additional

Intangible Assets - Additional Information (Detail) - MXN ($) $ in Thousands	6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017	Dec. 31, 2016
Disclosure of detailed information about intangible assets [abstract]
Intangible assets	$ 13,974,430		$ 14,678,640	$ 8,639,242
Expenses related to unsuccessful wells	$ 606,244	$ 766,688	$ 2,500,638

Intangible Assets - Schedule of

Intangible Assets - Schedule of Intangible Assets are Wells Unassigned to a Reserve (Detail) - MXN ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Wells unassigned to a reserve:
Balance at the beginning of period	$ 14,678,640	$ 8,639,242
Additions to construction in progress	9,810,680	20,553,952
Transfers against expenses	(8,447,877)	(3,663,986)
Transfers against fixed assets	(2,359,312)	(16,440,645)
Balance at the end of period	$ 13,974,430	$ 14,678,640

Intangible Assets - Schedule _2

Intangible Assets - Schedule of Other Concepts of Intangible Assets (Detail) - MXN ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Disclosure of detailed information about intangible assets [line items]
Other intangible assets	$ 5,882,376	$ 5,590,077
Accumulated depreciation and amortization [member]
Disclosure of detailed information about intangible assets [line items]
Other intangible assets	(2,391,283)	(2,169,311)
Rights of way [member]
Disclosure of detailed information about intangible assets [line items]
Other intangible assets	2,350,847	2,311,743
Licencse [member]
Disclosure of detailed information about intangible assets [line items]
Other intangible assets	3,791,955	3,586,553
Exploration expenses, evaluation of assets and concessoins [member]
Disclosure of detailed information about intangible assets [line items]
Other intangible assets	$ 2,130,857	$ 1,861,092

Long-term Notes Receivable an_3

Long-term Notes Receivable and Other Assets - Summary of Long-term Notes Receivable (Detail) - MXN ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Disclosure Of Notes Receivable And Other Long Term Assets [Abstract]
Promissory notes issued by the Mexican Government	$ 148,338,390	$ 147,274,076
Other long-term notes receivable	1,022,386	1,218,833
Total long-term notes receivable	$ 149,360,776	$ 148,492,909

Long-term Notes Receivable an_4

Long-term Notes Receivable and Other Assets - Summary of Promissory Notes Issued (Detail) - MXN ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Disclosure Of Notes Receivable And Other Long Term Assets [Abstract]
Total promissory notes	$ 152,010,092	$ 149,796,282
Less: current portion of notes receivable	3,671,702	2,522,206
Long-term promissory notes	$ 148,338,390	$ 147,274,076

Long-term Notes Receivable an_5

Long-term Notes Receivable and Other Assets - Additional Information (Detail) - MXN ($) $ in Thousands	Aug. 15, 2016	Jun. 29, 2016	Dec. 24, 2015	Aug. 15, 2016	Jun. 30, 2018	Dec. 31, 2017
Disclosure of notes receivable and other non current assets [line items]
Long-term notes receivable					$ 148,338,390	$ 147,274,076
Financing income [member]
Disclosure of notes receivable and other non current assets [line items]
Accrued yields					$ 4,764,834
Bottom of range [member]
Disclosure of notes receivable and other non current assets [line items]
Interest per annum of promissory notes					4.65%
Top of range [member]
Disclosure of notes receivable and other non current assets [line items]
Interest per annum of promissory notes					7.03%
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 an_6

Long-term Notes Receivable and Other Assets - Summary of Promissory Notes Maturity Dates and Annual Rates (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2018MXN ($)Promissory_Notes	Dec. 31, 2017MXN ($)
Disclosure of notes receivable and other non current assets [line items]
Total promissory notes	$ 152,010,092
Less: current portion	3,671,702
Long-term notes receivable	$ 148,338,390	$ 147,274,076
5.14% notes due 2019 [member]
Disclosure of notes receivable and other non current assets [line items]
Number of Promissory Notes | Promissory_Notes	1
Maturity	2,019
Yield Rate Range	5.14%
Long-term notes receivable	$ 3,671,702
5.39% notes due 2020 [member]
Disclosure of notes receivable and other non current assets [line items]
Number of Promissory Notes | Promissory_Notes	1
Maturity	2,020
Yield Rate Range	5.39%
Long-term notes receivable	$ 4,539,577
5.57% notes due 2021 [member]
Disclosure of notes receivable and other non current assets [line items]
Number of Promissory Notes | Promissory_Notes	1
Maturity	2,021
Yield Rate Range	5.57%
Long-term notes receivable	$ 5,382,870
5.74% notes due 2022 [member]
Disclosure of notes receivable and other non current assets [line items]
Number of Promissory Notes | Promissory_Notes	1
Maturity	2,022
Yield Rate Range	5.74%
Long-term notes receivable	$ 5,969,742
5.87% Notes due 2023 [member]
Disclosure of notes receivable and other non current assets [line items]
Number of Promissory Notes | Promissory_Notes	1
Maturity	2,023
Yield Rate Range	5.87%
Long-term notes receivable	$ 6,519,694
5.98% a 6.47% notes due 2024-2028 [member]
Disclosure of notes receivable and other non current assets [line items]
Number of Promissory Notes | Promissory_Notes	5
Maturity	2024-2028
Long-term notes receivable	$ 36,001,121
5.98% a 6.47% notes due 2024-2028 [member] | Bottom of range [member]
Disclosure of notes receivable and other non current assets [line items]
Yield Rate Range	5.98%
5.98% a 6.47% notes due 2024-2028 [member] | Top of range [member]
Disclosure of notes receivable and other non current assets [line items]
Yield Rate Range	6.47%
6.61% a 6.85% notes due 2029-2033 [member]
Disclosure of notes receivable and other non current assets [line items]
Number of Promissory Notes | Promissory_Notes	5
Maturity	2029-2033
Long-term notes receivable	$ 36,290,602
6.61% a 6.85% notes due 2029-2033 [member] | Bottom of range [member]
Disclosure of notes receivable and other non current assets [line items]
Yield Rate Range	6.61%
6.61% a 6.85% notes due 2029-2033 [member] | Top of range [member]
Disclosure of notes receivable and other non current assets [line items]
Yield Rate Range	6.85%
6.89% a 7.02% notes due 2034-2038 [member]
Disclosure of notes receivable and other non current assets [line items]
Number of Promissory Notes | Promissory_Notes	5
Maturity	2034-2038
Long-term notes receivable	$ 33,018,175
6.89% a 7.02% notes due 2034-2038 [member] | Bottom of range [member]
Disclosure of notes receivable and other non current assets [line items]
Yield Rate Range	6.89%
6.89% a 7.02% notes due 2034-2038 [member] | Top of range [member]
Disclosure of notes receivable and other non current assets [line items]
Yield Rate Range	7.02%
7.00% a 6.94% notes due 2039-2042 [member]
Disclosure of notes receivable and other non current assets [line items]
Number of Promissory Notes | Promissory_Notes	4
Maturity	2039-2042
Long-term notes receivable	$ 20,616,609
7.00% a 6.94% notes due 2039-2042 [member] | Bottom of range [member]
Disclosure of notes receivable and other non current assets [line items]
Yield Rate Range	7.00%
7.00% a 6.94% notes due 2039-2042 [member] | Top of range [member]
Disclosure of notes receivable and other non current assets [line items]
Yield Rate Range	6.94%

Long-term Notes Receivable an_7

Long-term Notes Receivable and Other Assets - Summary of Other Assets (Detail) - MXN ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Disclosure Of Notes Receivable And Other Long Term Assets [Abstract]
Payments in advance	$ 3,328,576	$ 4,683,117
Other	7,987,986	1,211,984
Total other assets	$ 11,316,562	$ 5,895,100

Debt - Additional Information (

Debt - Additional Information (Detail) € in Thousands

Jun. 26, 2018USD ($)

Jun. 04, 2018USD ($)

May 24, 2018USD ($)

Mar. 27, 2018USD ($)

Feb. 12, 2018USD ($)

Jun. 30, 2018USD ($)

Jun. 30, 2018MXN ($)

Jun. 04, 2018CHF (SFr)

May 24, 2018EUR (€)

Apr. 16, 2018USD ($)

Mar. 05, 2018USD ($)

Dec. 31, 2017USD ($)

Disclosure of debt [Line Items]

Line of credit to ensure liquidity

$ 6,700,000

$ 23,500,000

5.500% Bonds due 2044 [member]

Disclosure of debt [Line Items]

Interest rate

5.50%

Principal amount of debt exchanged

$ 952,454

6.350% Bonds due 2048 [member]

Disclosure of debt [Line Items]

Interest rate

6.35%

Principal amount of debt exchanged for

$ 881,899

5.6250% Bonds due 2046 [member]

Disclosure of debt [Line Items]

Interest rate

5.625%

Principal amount of debt exchanged

$ 1,021,065

6.350% Bonds due 2048 [member]

Disclosure of debt [Line Items]

Interest rate

6.35%

Principal amount of debt exchanged for

$ 946,764

3.125% Notes due 2019 [member]

Disclosure of debt [Line Items]

Interest rate

3.125%

Principal amount of debt purchased

$ 138,598

5.500% Notes due 2019 [member]

Disclosure of debt [Line Items]

Interest rate

5.50%

Principal amount of debt

$ 558,644

8.000% Notes due 2019 [member]

Disclosure of debt [Line Items]

Interest rate

8.00%

Principal amount of debt

$ 91,843

6.000% Notes due 2020 [member]

Disclosure of debt [Line Items]

Interest rate

6.00%

Principal amount of debt

$ 183,017

3.500% Notes due 2020 [member]

Disclosure of debt [Line Items]

Interest rate

3.50%

Principal amount of debt

$ 817,303

300 basis point due December 26, 2025 [member]

Disclosure of debt [Line Items]

Maturity date

December 26, 2025

Line of credit

$ 250,000

Interest rate basis description

LIBOR plus 300 basis points

70 basis points, due February 2025 [member]

Disclosure of debt [Line Items]

Maturity date

February 2,025

Line of credit

$ 181,101

Interest rate basis description

LIBOR plus 70 basis points

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

Disclosure of debt [Line Items]

Revolving credit facility amount

9,557,000

Repayment of revolving credit lines

9,757,000

Revolving credit amount outstanding

$ 27,500

$ 227,500

Series C medium term notes program [member]

Disclosure of debt [Line Items]

Total debt securities issued

4,000,000

€ 3,150,000

Notes issued

$ 102,000,000

92,000,000

Prior size of the Medium Term Notes Program

$ 92,000,000

New size of the Medium Term Notes Program

$ 102,000,000

Series C medium term notes program [member] | 5.35% Notes due 2028 [member]

Disclosure of debt [Line Items]

Debt securities issued

$ 2,500,000

Interest rate

5.35%

Maturity date

2,028

Series C medium term notes program [member] | 6.35% Bonds due 2048 [member]

Disclosure of debt [Line Items]

Debt securities issued

$ 1,500,000

Interest rate

6.35%

Maturity date

2,048

Series C medium term notes program [member] | 2.500% Notes due on November 24, 2022 [member]

Disclosure of debt [Line Items]

Debt securities issued | €

€ 600,000

Interest rate

2.50%

2.50%

Maturity date

November 24, 2022

Series C medium term notes program [member] | Floating Rate Notes due on August 24, 2023 [member]

Disclosure of debt [Line Items]

Debt securities issued | €

€ 650,000

Maturity date

August 24, 2023

Series C medium term notes program [member] | 3.625% Notes due on November 24, 2025 [member]

Disclosure of debt [Line Items]

Debt securities issued | €

€ 650,000

Interest rate

3.625%

3.625%

Maturity date

November 24, 2025

Series C medium term notes program [member] | 4.750% Notes due on February 26, 2029 [member]

Disclosure of debt [Line Items]

Debt securities issued | €

€ 1,250,000

Interest rate

4.75%

4.75%

Maturity date

February 26, 2029

Series C medium term notes program [member] | 1.750% Notes due 2023 [member]

Disclosure of debt [Line Items]

Debt securities issued

$ 102,000,000

SFr 365,000

Interest rate

1.75%

1.75%

Maturity date

2,023

Debt - Summary of Foreign Curre

Debt - Summary of Foreign Currency Translation (Detail)	Jun. 30, 2018MXN ($)
U.S. dollars [member]
Disclosure Of Foreign Currency Translation [Line Items]
Exchange rate	$ 19.86330
Japanese yen [member]
Disclosure Of Foreign Currency Translation [Line Items]
Exchange rate	0.18002
Pounds Sterling [member]
Disclosure Of Foreign Currency Translation [Line Items]
Exchange rate	26.00901
Euro [member]
Disclosure Of Foreign Currency Translation [Line Items]
Exchange rate	23.00567
Swiss Francs [member]
Disclosure Of Foreign Currency Translation [Line Items]
Exchange rate	19.92107
Australian Dollar [member]
Disclosure Of Foreign Currency Translation [Line Items]
Exchange rate	$ 14.61939

Financial Instruments - Summary

Financial Instruments - Summary of Carrying Amounts of Financial Assets and Liabilities (Detail) - MXN ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
Disclosure of detailed information about financial instruments [line items]
Cash and cash equivalents	$ 109,506,711	$ 97,851,754	$ 110,530,917	$ 163,532,513
Investments in joint ventures, associates	16,938,755	16,707,364	$ 21,023,163
Suppliers	(109,471,364)	(139,955,378)
Debt	(2,099,656,515)	(2,153,383,220)
Derivatives [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets measured at fair value	27,141,083	30,113,454
Equity instruments [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets measured at fair value	1,056,918	1,056,918
Derivative liabilities [member]
Disclosure of detailed information about financial instruments [line items]
Financial liabilities measured at fair value	(14,958,973)	(17,745,979)
Carrying amount [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets measured at fair value	28,198,001	31,170,372
Cash and cash equivalents	109,506,710	97,851,754
Accounts receivable	171,537,070	170,645,678
Investments in joint ventures, associates	16,938,755	16,707,364
Long-term notes receivable	149,360,776	148,492,909
Financial assets not measured at fair value	447,343,311	433,697,705
Financial liabilities measured at fair value	(14,958,973)	(17,745,979)
Suppliers	(109,471,364)	(139,955,378)
Accounts payable	(21,301,855)	(23,211,845)
Debt	(2,070,332,329)	(2,037,875,071)
Financial liabilities not measured at fair value	(2,201,105,548)	2,201,042,294
Carrying amount [member] | FVTPL [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets measured at fair value	27,141,083	30,113,454
Carrying amount [member] | FVOCI - equity instruments [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets measured at fair value	1,056,918
Cash and cash equivalents		97,851,754
Accounts receivable		170,645,678
Financial assets not measured at fair value		268,497,432
Carrying amount [member] | Financial assets at amortised cost [member]
Disclosure of detailed information about financial instruments [line items]
Cash and cash equivalents	109,506,710
Accounts receivable	171,537,070
Investments in joint ventures, associates	16,938,755
Long-term notes receivable	149,360,776
Financial assets not measured at fair value	447,343,311
Carrying amount [member] | Held-to-maturity investments, category [member]
Disclosure of detailed information about financial instruments [line items]
Investments in joint ventures, associates		16,707,364
Long-term notes receivable		148,492,909
Financial assets not measured at fair value		165,200,273
Carrying amount [member] | Available-for-sale financial assets [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets measured at fair value		1,056,918
Carrying amount [member] | Derivatives [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets measured at fair value	27,141,083	30,113,454
Carrying amount [member] | Derivatives [member] | FVTPL [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets measured at fair value	27,141,083	30,113,454
Carrying amount [member] | Equity instruments [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets measured at fair value	1,056,918	1,056,918
Carrying amount [member] | Equity instruments [member] | FVOCI - equity instruments [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets measured at fair value	1,056,918
Carrying amount [member] | Equity instruments [member] | Available-for-sale financial assets [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets measured at fair value		1,056,918
Carrying amount [member] | Financial liabilities at fair value through profit or loss, designated upon initial recognition or subsequently, category [member]
Disclosure of detailed information about financial instruments [line items]
Financial liabilities measured at fair value	(14,958,973)	(17,745,979)
Carrying amount [member] | Other financial liabilities [member]
Disclosure of detailed information about financial instruments [line items]
Suppliers	(109,471,364)	(139,955,378)
Accounts payable	(21,301,855)	(23,211,845)
Debt	(2,070,332,329)	(2,037,875,071)
Financial liabilities not measured at fair value	(2,201,105,548)	2,201,042,294
Carrying amount [member] | Derivative liabilities [member]
Disclosure of detailed information about financial instruments [line items]
Financial liabilities measured at fair value	(14,958,973)	(17,745,979)
Carrying amount [member] | Derivative liabilities [member] | Financial liabilities at fair value through profit or loss, designated upon initial recognition or subsequently, category [member]
Disclosure of detailed information about financial instruments [line items]
Financial liabilities measured at fair value	(14,958,973)	(17,745,979)
Level 2 [member]
Disclosure of detailed information about financial instruments [line items]
Debt	(2,099,656,515)	(2,153,383,220)
Level 2 [member] | Derivatives [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets measured at fair value	27,141,083	30,113,454
Level 2 [member] | Equity instruments [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets measured at fair value	1,056,918	1,056,918
Level 2 [member] | Derivative liabilities [member]
Disclosure of detailed information about financial instruments [line items]
Financial liabilities measured at fair value	$ (14,958,973)	$ (17,745,979)

Financial Instruments - Additio

Financial Instruments - Additional Information (Detail) - MXN ($)	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Disclosure of detailed information about financial instruments [abstract]
Net fair value of derivative financial instruments	$ 12,182,110,000		$ 12,367,475,000
Derivative financial instruments designated as hedges	0		$ 0
Net gain (loss) of derivative financial instruments	$ (9,292,906,000)	$ 20,332,885,000

Provisions for Sundry Credito_3

Provisions for Sundry Creditors - Summary of Provisions for Sundry Creditors and Others (Detail) - MXN ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Disclosure of other provisions [abstract]
Provision for plugging of wells (Note 12)	$ 73,160,276	$ 68,797,600
Provision for trials in process (Note 18)	9,502,852	7,812,689
Provision for environmental costs	11,320,443	11,067,134
Provisions	$ 93,983,571	$ 87,677,423

Contingencies - Additional Info

Contingencies - Additional Information (Detail)	Dec. 12, 2017USD ($)	Aug. 01, 2017USD ($)	Aug. 01, 2017MXN ($)	Jun. 11, 2015MXN ($)	Jul. 08, 2011MXN ($)	Apr. 04, 2011USD ($)	Mar. 31, 2018USD ($)	Jun. 30, 2018MXN ($)	Dec. 31, 2017MXN ($)
Disclosure of contingent liabilities [abstract]
Accrued reserve on contingent liabilities								$ 9,502,852,000	$ 7,812,689,000
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	$ 139,870,000

Subsequent Events - Additional

Subsequent Events - Additional Information (Detail)	Oct. 08, 2018USD ($)$ / $$ / Barrel	Sep. 30, 2018MXN ($)	Jun. 30, 2018USD ($)$ / $	Sep. 30, 2018USD ($)	Sep. 30, 2018MXN ($)	Sep. 05, 2018	Jul. 06, 2018MXN ($)	Dec. 31, 2017USD ($)
Disclosure of non-adjusting events after reporting period [line items]
Exchange rates | $ / $			19.8633
P.M.I. Holdings, B.V. [member]
Disclosure of non-adjusting events after reporting period [line items]
Repayment of revolving credit lines			$ 9,757,000
Outstanding of revolving credit lines			$ 27,500					$ 227,500
Subsequent Event [member]
Disclosure of non-adjusting events after reporting period [line items]
Exchange rates | $ / $	19.1328
Appreciation of the value of the peso in U.S. dollars terms	3.68%
Weighted average price of crude oil | $ / Barrel	76.55
Percentage increase in average price	11.39%
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	$ 5,668,000,000,000,000
Repayment of revolving credit lines	5,608,000,000,000,000
Outstanding of revolving credit lines	$ 87,500,000,000
Subsequent Event [member] | PMV Minera [member]
Disclosure of non-adjusting events after reporting period [line items]
Sale of ownership , percentage							44.09%
Sale of ownership, value of transaction							$ 3,436,000,000
Subsequent Event [member] | TAG Norte Holding [member]
Disclosure of non-adjusting events after reporting period [line items]
Sale of ownership , percentage						5.00%
Sale of ownership, value equity				$ 43,036,800	$ 826,046,500
Sale of ownership, net profit		$ 10,257,000