Valero Energy (VLO) 10-Q 5 Nov 13 2013 Q3 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	9 Months Ended
	Sep. 30, 2013	Oct. 31, 2013
Document and Entity Information	'	'
Entity Registrant Name	'VALERO ENERGY CORP/TX	'
Entity Central Index Key	'0001035002	'
Document Type	'10-Q	'
Document Period End Date	30-Sep-13	'
Amendment Flag	'false	'
Document Fiscal Year Focus	'2013	'
Document Fiscal Period Focus	'Q3	'
Current Fiscal Year End Date	'--12-31	'
Entity Well-known Seasoned Issuer	'Yes	'
Entity Voluntary Filers	'No	'
Entity Current Reporting Status	'Yes	'
Entity Filer Category	'Large Accelerated Filer	'
Entity Common Stock, Shares Outstanding	'	539,562,259

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Current assets:	'	'
Cash and temporary cash investments	$1,908	$1,723
Receivables, net	9,126	8,167
Inventories	7,063	5,973
Income taxes receivable	108	169
Deferred income taxes	257	274
Prepaid expenses and other	131	154
Total current assets	18,593	16,460
Property, plant and equipment, at cost	33,652	34,132
Accumulated depreciation	-8,010	-7,832
Property, plant and equipment, net	25,642	26,300
Intangible assets, net	160	213
Deferred charges and other assets, net	1,898	1,504
Total assets	46,293	44,477
Current liabilities:	'	'
Current portion of debt and capital lease obligations	303	586
Accounts payable	10,998	9,348
Accrued expenses	598	590
Taxes other than income taxes	1,287	1,026
Income taxes payable	96	1
Deferred income taxes	386	378
Total current liabilities	13,668	11,929
Debt and capital lease obligations, less current portion	6,261	6,463
Deferred income taxes	6,312	5,860
Other long-term liabilities	1,665	2,130
Commitments and contingencies	'	'
Valero Energy Corporation stockholders’ equity:	'	'
Common stock, $0.01 par value; 1,200,000,000 shares authorized; 673,501,593 and 673,501,593 shares issued	7	7
Additional paid-in capital	7,232	7,322
Treasury stock, at cost; 131,876,124 and 121,406,520 common shares	-6,856	-6,437
Retained earnings	17,804	17,032
Accumulated other comprehensive income	83	108
Total Valero Energy Corporation stockholders’ equity	18,270	18,032
Noncontrolling interests	117	63
Total equity	18,387	18,095
Total liabilities and equity	$46,293	$44,477

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Sep. 30, 2013	Dec. 31, 2012
Valero Energy Corporation stockholders’ equity:	'	'
Common stock, par value (in usd per share)	$0.01	$0.01
Common stock, shares authorized	1,200,000,000	1,200,000,000
Common stock, shares issued	673,501,593	673,501,593
Treasury stock, common shares	131,876,124	121,406,520

Consolidated_Statements_of_Inc

Consolidated Statements of Income (Unaudited) (USD $)	3 Months Ended		9 Months Ended
In Millions, except Per Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Operating revenues	$36,137	$34,726	$103,645	$104,555
Costs and expenses:	'	'	'	'
Cost of sales	33,931	31,312	96,139	95,968
Operating expenses:	'	'	'	'
Refining	954	930	2,736	2,762
Retail	0	178	226	514
Ethanol	102	76	281	248
General and administrative expenses	170	174	579	509
Depreciation and amortization expense	448	402	1,283	1,172
Asset impairment losses	0	345	0	956
Total costs and expenses	35,605	33,417	101,244	102,129
Operating income	532	1,309	2,401	2,426
Other income (expense), net	17	-2	42	-1
Interest and debt expense, net of capitalized interest	-102	-70	-263	-243
Income before income tax expense	447	1,237	2,180	2,182
Income tax expense	123	564	739	1,111
Net income	324	673	1,441	1,071
Less: Net income (loss) attributable to noncontrolling interests	12	-1	9	-2
Net income attributable to Valero Energy Corporation stockholders	$312	$674	$1,432	$1,073
Earnings per common share	$0.58	$1.22	$2.62	$1.94
Weighted-average common shares outstanding (in millions)	540	549	544	550
Earnings per common share – assuming dilution	$0.57	$1.21	$2.61	$1.93
Weighted-average common shares outstanding – assuming dilution (in millions)	545	556	549	556
Dividends per common share	$0.23	$0.18	$0.63	$0.48

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (Unaudited) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Net income	$324	$673	$1,441	$1,071
Other comprehensive income (loss):	'	'	'	'
Foreign currency translation adjustment	181	143	-87	175
Pension and other postretirement benefits:	'	'	'	'
Gain arising during the period related to remeasurement due to plan amendments	0	0	328	0
(Gain) loss reclassified into income related to:	'	'	'	'
Net actuarial loss	14	8	43	25
Prior service credit	-9	-5	-24	-15
Net gain on pension and other postretirement benefits	5	3	347	10
Derivative instruments designated and qualifying as cash flow hedges:	'	'	'	'
Net gain (loss) arising during the period	3	27	-6	43
Net gain reclassified into income	-6	-45	-1	-81
Net loss on cash flow hedges	-3	-18	-7	-38
Other comprehensive income, before income tax expense (benefit)	183	128	253	147
Income tax expense (benefit) related to items of other comprehensive income	1	-5	119	-9
Other comprehensive income	182	133	134	156
Comprehensive income	506	806	1,575	1,227
Less: Comprehensive income (loss) attributable to noncontrolling interests	12	-1	9	-2
Comprehensive income attributable to Valero Energy Corporation stockholders	$494	$807	$1,566	$1,229

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (Unaudited) (USD $)	9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Cash flows from operating activities:	'	'
Net income	$1,441	$1,071
Adjustments to reconcile net income to net cash provided by operating activities:	'	'
Depreciation and amortization expense	1,283	1,172
Asset impairment losses	0	956
Noncash interest expense and other income, net	-7	18
Stock-based compensation expense	31	29
Deferred income tax expense	488	576
Changes in current assets and current liabilities	-231	1,191
Changes in deferred charges and credits and other operating activities, net	30	-66
Net cash provided by operating activities	3,035	4,947
Cash flows from investing activities:	'	'
Capital expenditures	-1,690	-2,129
Deferred turnaround and catalyst costs	-527	-339
Proceeds from the sale of the Paulsboro Refinery	0	160
Minor acquisitions	0	-77
Other investing activities, net	-56	-28
Net cash used in investing activities	-2,273	-2,413
Non-bank debt:	'	'
Borrowings	0	300
Repayments	-480	-862
Bank credit agreements:	'	'
Borrowings	0	1,100
Repayments	0	-1,100
Accounts receivable sales program:	'	'
Proceeds from the sale of receivables	0	1,500
Repayments	0	-1,650
Purchase of common stock for treasury	-589	-148
Proceeds from the exercise of stock options	46	36
Common stock dividends	-342	-263
Contributions from noncontrolling interests	45	34
Separation of retail business:	'	'
Proceeds from short-term debt	550	0
Cash distributed to Valero by CST Brands, Inc.	500	0
Cash held and retained by CST Brands, Inc. upon separation	-315	0
Other financing activities, net	27	8
Net cash used in financing activities	-558	-1,045
Effect of foreign exchange rate changes on cash	-19	36
Net increase in cash and temporary cash investments	185	1,525
Cash and temporary cash investments at beginning of period	1,723	1,024
Cash and temporary cash investments at end of period	$1,908	$2,549

Basis_of_Presentation_and_Summ

Basis of Presentation and Summary of Significant Accounting Policies	9 Months Ended
	Sep. 30, 2013
Accounting Policies [Abstract]	'
BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	'
	1	BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
	Basis of Presentation
	As used in this report, the terms “Valero,” “we,” “us,” or “our” may refer to Valero Energy Corporation, one or more of its consolidated subsidiaries, or all of them taken as a whole.
	These unaudited financial statements have been prepared in accordance with United States (U.S.) generally accepted accounting principles (GAAP) for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X of the Securities Exchange Act of 1934. Accordingly, they do not include all of the information and notes required by U.S. GAAP for complete financial statements. In the opinion of management, all adjustments considered necessary for a fair presentation have been included. All such adjustments are of a normal recurring nature unless disclosed otherwise. Financial information for the three and nine months ended September 30, 2013 and 2012 included in these Condensed Notes to Consolidated Financial Statements is derived from our unaudited financial statements. Operating results for the three and nine months ended September 30, 2013 are not necessarily indicative of the results that may be expected for the year ending December 31, 2013.
	The balance sheet as of December 31, 2012 has been derived from our audited financial statements as of that date. For further information, refer to our financial statements and notes thereto included in our annual report on Form 10-K for the year ended December 31, 2012.
	Significant Accounting Policies
	Use of Estimates
	The preparation of financial statements in conformity with U.S. GAAP requires us to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from those estimates. On an ongoing basis, we review our estimates based on currently available information. Changes in facts and circumstances may result in revised estimates.
	Comprehensive Income
	In February 2013, the provisions of Accounting Standards Codification (ASC) Topic 220, “Comprehensive Income,” were amended to require an entity to disclose information about the amounts reclassified out of accumulated other comprehensive income and into net income. An entity is required to present information on the face of the statement of income or in the notes to the financial statements about the effects on net income from significant amounts reclassified out of accumulated other comprehensive income if those amounts were required to be reclassified into net income in their entirety in the same reporting period they were initially charged to other comprehensive income. For other significant amounts that were not required to be reclassified into net income in their entirety in the same reporting period they were initially charged to other comprehensive income, a cross-reference is required in the notes to the financial statements to the disclosures that provide additional details about those amounts. These provisions were effective for interim and annual reporting periods beginning after December 15, 2012. The adoption of this guidance effective January 1, 2013 did not affect our financial position or results of operations, but resulted in additional disclosures, which are included in Note 7.
	Balance Sheet Offsetting Arrangements
	In December 2011, the provisions of ASC Topic 210, “Balance Sheet,” were amended to require an entity to disclose information about offsetting and related arrangements to enable users of its financial statements to understand the effect of these arrangements on its financial position. In January 2013, the provisions of ASC Topic 210 were further amended to clarify that the scope of the previous amendment only applies to derivative instruments, including bifurcated derivatives, repurchase agreements and reverse repurchase agreements, and securities borrowing and securities lending transactions that are either eligible for offset in the balance sheet or are subject to an agreement similar to a master netting agreement. The guidance requires entities to disclose both gross information and net information about assets and liabilities within the scope of the amendment. These provisions were effective for interim and annual reporting periods beginning on or after January 1, 2013. The adoption of this guidance effective January 1, 2013 did not affect our financial position or results of operations, but resulted in additional disclosures, which are included in Note 12.
	Other
	The statement of cash flows for the nine months ended September 30, 2012, which was included in our Form 10‑Q for the quarterly period ended September 30, 2012, reflected an incorrect classification of $160 million in proceeds on a note receivable related to the sale of our Paulsboro Refinery in December 2010. We previously reflected such proceeds as a component of cash flows from operating activities rather than as a component of cash flows from investing activities. The statement of cash flows for the nine months ended September 30, 2012 included in this Form 10-Q for the quarterly period ended September 30, 2013 has been corrected to properly reflect the classification of those proceeds.
	New Accounting Pronouncement
	In July 2013, the provisions of ASC Topic 740, “Income Taxes,” were amended to provide specific guidance on the financial statement presentation of an unrecognized tax benefit when a net operating loss carryforward, a similar tax loss, or a tax credit carryforward exists at the reporting date. The amendment requires entities to present an unrecognized tax benefit as a reduction to the deferred tax asset generated by the net operating loss carryforward, similar tax loss, or tax credit carryforward, if such items are available to be used to offset the unrecognized tax benefit. These provisions are effective for interim and annual reporting periods beginning after December 15, 2013 and should be applied prospectively to all unrecognized tax benefits that exist at the effective date, with retrospective application permitted. The adoption of this guidance effective January 1, 2014 will not affect our financial position or results of operations, nor will it require any additional disclosures, but may result in a change in presentation to our consolidated balance sheets.

Separation_of_Retail_Business

Separation of Retail Business	9 Months Ended
	Sep. 30, 2013
Disposal Group, Not Discontinued Operation, Disposal Disclosures [Abstract]	'
SEPARATION OF RETAIL BUSINESS	'
	2	SEPARATION OF RETAIL BUSINESS
	On May 1, 2013, we completed the separation of our retail business by creating an independent public company named CST Brands, Inc. (CST) and distributing 80 percent of the outstanding shares of CST common stock to our stockholders on May 1, 2013. Each Valero stockholder received one share of CST common stock for every nine shares of Valero common stock held at the close of business on the record date of April 19, 2013. Fractional shares of CST common stock were not distributed, but instead were aggregated and sold in the open market at prevailing rates with net cash proceeds then distributed pro rata to each Valero stockholder who was entitled to receive fractional shares.
	In connection with the separation, we received an aggregate of $1.05 billion in cash, consisting of $550 million from the issuance of short-term debt to a third-party financial institution on April 16, 2013 and $500 million distributed to us by CST on May 1, 2013. The cash distributed to us by CST was borrowed by CST on May 1, 2013 under its senior secured credit facility. See Note 5 for further discussion of that credit facility. Also on May 1, 2013, CST issued $550 million of its senior unsecured bonds to us, and we exchanged those bonds with the third-party financial institution in satisfaction of our short-term debt. Immediately prior to May 1, 2013, subsidiaries of CST held $315 million of cash, and CST retained that cash following the distribution on May 1, 2013. Also in connection with the separation, we incurred a tax liability of approximately $189 million primarily related to the manner in which the transaction is treated for tax purposes in Canada, and most of these taxes will not be paid until the first half of 2014. Therefore, the cash we received as a result of the separation, net of our tax liability, was $546 million. We also incurred $30 million in costs during the three months ended June 30, 2013 to effect the separation, which are included in general and administrative expenses. We expect to liquidate the remaining 20 percent of the outstanding shares of CST common stock that we own within 18 months of the date of separation.
	We also entered into long-term motor fuel supply agreements with CST in the U.S. and Canada. The nature and significance of our agreements to supply motor fuel to CST through 2028 represents a continuation of activities with CST for accounting purposes. As such, the historical results of operations of our retail business have not been reported as discontinued operations in our statements of income.
	Selected historical results of operations of our retail business prior to the separation are disclosed in Note 10. Subsequent to May 1, 2013, our share of CST’s results of operations associated with our retained 20 percent equity interest in CST is reflected in “other income (expense), net” and our equity investment in CST, which is accounted for under the equity method, is included in “deferred charges and other assets, net.” Our share of income taxes incurred directly by CST is reported in the equity in earnings from CST, and as such is not included in income taxes in our statements of income.
	The following table presents the carrying values of the major categories of assets and liabilities of our retail business, immediately preceding its separation on May 1, 2013, which are excluded from our consolidated balance sheet as of September 30, 2013 (in millions):
	Assets
	Cash and temporary cash investments	$	315
	Credit card receivables from Valero	44
	Other receivables, net	109
	Inventories	170
	Deferred income taxes	14
	Prepaid expenses and other	13
	Total current assets	665
	Property, plant and equipment, at cost	1,891
	Accumulated depreciation	(611		)
	Property, plant and equipment, net	1,280
	Intangible assets, net	38
	Deferred charges and other assets, net	191
	Total assets	$	2,174
	Liabilities
	Current portion of capital lease obligations	$	2
	Trade payable to Valero	242
	Other accounts payable	96
	Accrued expenses	31
	Taxes other than income taxes	20
	Total current liabilities	391
	Debt and capital lease obligations, less current portion	1,053
	Deferred income taxes	83
	Other long-term liabilities	112
	Total liabilities	$	1,639
	We retained certain environmental and other liabilities related to our former retail business and we have indemnified CST for certain self-insurance liabilities related to its employees and property.
	On October 24, 2013, we borrowed $525 million under a short-term debt agreement, as further described in Note 5, with a third-party financial institution in anticipation of the liquidation of our remaining 20 percent of the outstanding shares of CST common stock. We intend to exchange our shares of CST common stock with the third-party financial institution in satisfaction of our short-term debt.

Impairments

Impairments	9 Months Ended
	Sep. 30, 2013
Property, Plant and Equipment Impairment or Disposal [Abstract]	'
IMPAIRMENTS	'
	3	IMPAIRMENTS
	Aruba Refinery
	In March 2012, we suspended the operations of the Aruba Refinery because of its inability to generate positive cash flows on a sustained basis subsequent to its restart in January 2011 and the sensitivity of its profitability to sour crude oil differentials, which had narrowed significantly in the fourth quarter of 2011. Shortly thereafter, we received a non-binding offer to purchase the refinery for $350 million, plus working capital as of the closing date. Because of our decision to suspend the operations and the possibility of selling the refinery, we evaluated the refinery for potential impairment as of March 31, 2012 and concluded that it was impaired. We recognized an asset impairment loss of $595 million in March 2012. We did not, however, classify the Aruba Refinery as “held for sale” in our balance sheet because all of the accounting criteria required for that classification had not been met.
	In September 2012, we decided to reorganize the Aruba Refinery into a crude oil and refined products terminal in response to the withdrawal of the non-binding offer to purchase the refinery. We bifurcated the idled crude oil processing units and related infrastructure (refining assets) from the terminal assets and evaluated the refining assets for potential impairment as of September 30, 2012. We concluded that the refining assets were impaired and recognized an asset impairment loss of $308 million in September 2012. We also recognized an asset impairment loss of $25 million related to materials and supplies inventories that supported the refining operations, resulting in a total asset impairment loss of $333 million that was recognized in September 2012 related to the Aruba Refinery. The terminal assets were not impaired.
	We have continued to maintain the refining assets to allow them to be restarted and do not consider them to be abandoned. Therefore, we have not reflected the Aruba Refinery as a discontinued operation in our financial statements. It is possible, however, that we may abandon these assets in the future. Should we ultimately decide to abandon these assets, we may be required under our land lease agreement with the Government of Aruba to dismantle and remove the abandoned assets, which would require us to recognize an asset retirement obligation, that would be immediately charged to expense. We do not expect these amounts to be material to our financial position or results of operations.
	The variation in the customary relationship between income tax expense and income before income tax expense for the three and nine months ended September 30, 2012 was primarily due to not recognizing a tax benefit associated with the asset impairment loss of $333 million and $928 million, respectively, related to the Aruba Refinery as we do not expect to realize this tax benefit.
	Cancelled Capital Project
	In March 2012, we wrote down the carrying value of equipment associated with a permanently cancelled capital project at one of our refineries, resulting in an asset impairment loss of $16 million.
	Retail Stores
	We evaluated certain convenience stores operated by our former retail segment for potential impairment as of September 30, 2012 and concluded that they were impaired. We wrote down the carrying values of these stores to their estimated fair values, which totaled $5 million, resulting in an asset impairment loss of $12 million that was recorded in September 2012.

Inventories

Inventories	9 Months Ended
	Sep. 30, 2013
Inventory Disclosure [Abstract]	'
INVENTORIES	'
	4	INVENTORIES
	Inventories consisted of the following (in millions):
		September 30,		December 31,
		2013		2012
	Refinery feedstocks	$	3,109	$	2,458
	Refined products and blendstocks	3,582		2,995
	Ethanol feedstocks and products	148		191
	Convenience store merchandise	—		112
	Materials and supplies	224		217
	Inventories	$	7,063	$	5,973
	As of September 30, 2013 and December 31, 2012, the replacement cost (market value) of last in, first out (LIFO) inventories exceeded their LIFO carrying amounts by approximately $7.1 billion and $6.7 billion, respectively.

Debt

Debt	9 Months Ended
	Sep. 30, 2013
Debt Disclosure [Abstract]	'
DEBT	'
	5	DEBT
	Bank Debt and Credit Facilities
	We have a $3 billion revolving credit facility (the Revolver) that has a maturity date of December 2016. The Revolver has certain restrictive covenants, including a maximum debt-to-capitalization ratio of 60 percent. As of September 30, 2013 and December 31, 2012, our debt-to-capitalization ratios, calculated in accordance with the terms of the Revolver, were 20 percent and 23 percent, respectively. We believe that we will remain in compliance with this covenant. In addition to the Revolver, one of our Canadian subsidiaries has a committed revolving credit facility under which it may borrow and obtain letters of credit up to C$50 million.
	During the nine months ended September 30, 2013, we had no borrowings or repayments under our Revolver. During the nine months ended September 30, 2012, we borrowed and repaid $1.1 billion under our Revolver. We had no borrowings or repayments under the Canadian revolving credit facility during the nine months ended September 30, 2013 and 2012. As of September 30, 2013 and December 31, 2012, we had no borrowings outstanding under the Revolver or the Canadian revolving credit facility.
	On March 20, 2013, in anticipation of the separation of our retail business as described in Note 2, CST entered into a credit agreement providing for $800 million of senior secured credit facilities (consisting of a $500 million term loan facility and a revolving credit facility with an aggregate principal amount of up to $300 million). Borrowings under the term loan and revolving credit facilities bear interest at the London Interbank Offered Rate (LIBOR) plus a margin or an alternate base rate, as defined in the agreement, plus a margin. The credit agreement matures on May 1, 2018 and has certain restrictive covenants. This credit agreement and related credit facilities were retained by CST after the separation from us. Therefore, we have no rights to obtain credit under nor any liabilities in connection with this credit agreement and related credit facilities.
	On April 16, 2013, also in anticipation of the separation of our retail business, we borrowed $550 million under a short-term debt agreement with a third-party financial institution. On May 1, 2013, CST issued $550 million of its senior unsecured bonds to us, and we exchanged those bonds with the third-party financial institution in satisfaction of our short-term debt.
	On October 24, 2013, we borrowed $525 million under a short-term debt agreement with a third-party financial institution in anticipation of the liquidation of our remaining 20 percent of the outstanding shares of CST common stock. The debt matures on December 12, 2013.
	We had outstanding letters of credit under our committed lines of credit as follows (in millions):
								Amounts Outstanding
			Borrowing			Expiration		September 30,		December 31,
			Capacity					2013		2012
	Letter of credit facilities		$	550		Jun-14		$	292	$	418
	Revolver		$	3,000		Dec-16		$	59	$	59
	Canadian revolving credit facility		C$	50		Nov-13		C$	10	C$	10
	As of September 30, 2013 and December 31, 2012, we had $257 million and $275 million, respectively, of letters of credit outstanding under our uncommitted short-term bank credit facilities. We anticipate that we will be able to renew our Canadian revolving credit facility prior to its expiration in November 2013.
	Non-Bank Debt
	During the nine months ended September 30, 2013, the following activity occurred:
	•	in June 2013, we made a scheduled debt repayment of $300 million related to our 4.75% notes; and
	•	in January 2013, we made a scheduled debt repayment of $180 million related to our 6.7% senior notes.
	During the nine months ended September 30, 2012, the following activity occurred:
	•	in June 2012, we remarketed and received proceeds of $300 million related to the 4.0% Gulf Opportunity Zone Revenue Bonds Series 2010 issued by the Parish of St. Charles, State of Louisiana, which are due December 1, 2040, but are subject to mandatory tender on June 1, 2022;
	•	in April 2012, we made scheduled debt repayments of $4 million related to our Series 1997A 5.45% industrial revenue bonds and $750 million related to our 6.875% notes; and
	•	in March 2012, we exercised the call provisions on our Series 1997 5.6%, Series 1998 5.6%, Series 1999 5.7%, Series 2001 6.65%, and Series 1997A 5.45% industrial revenue bonds, which were redeemed on May 3, 2012 for $108 million, or 100 percent of their outstanding stated values.
	Accounts Receivable Sales Facility
	We have an accounts receivable sales facility with a group of third-party entities and financial institutions to sell up to $1.5 billion of eligible trade receivables on a revolving basis. In July 2013, we amended this facility to extend the maturity date to July 2014. Proceeds from the sale of receivables under this facility are reflected as debt. Under this program, one of our marketing subsidiaries (Valero Marketing) sells eligible receivables, without recourse, to another of our subsidiaries (Valero Capital), whereupon the receivables are no longer owned by Valero Marketing. Valero Capital, in turn, sells an undivided percentage ownership interest in the eligible receivables, without recourse, to the third-party entities and financial institutions. To the extent that Valero Capital retains an ownership interest in the receivables it has purchased from Valero Marketing, such interest is included in our financial statements solely as a result of the consolidation of the financial statements of Valero Capital with those of Valero Energy Corporation; the receivables are not available to satisfy the claims of the creditors of Valero Marketing or Valero Energy Corporation.
	Changes in the amounts outstanding under our accounts receivable sales facility were as follows (in millions):
		Nine Months Ended
		September 30,
		2013			2012
	Balance as of beginning of period	$	100		$	250
	Proceeds from the sale of receivables	—			1,500
	Repayments	—			(1,650		)
	Balance as of end of period	$	100		$	100
	Capitalized Interest
	Capitalized interest was $16 million and $59 million for the three months ended September 30, 2013 and 2012, respectively, and $101 million and $164 million for the nine months ended September 30, 2013 and 2012, respectively.

Commitments_and_Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2013
Commitments and Contingencies Disclosure [Abstract]	'
COMMITMENTS AND CONTINGENCIES	'
	6	COMMITMENTS AND CONTINGENCIES
	Environmental Matter
	We are involved, together with several other companies, in an environmental cleanup in the Village of Hartford, Illinois (the Village) and the adjacent shutdown refinery site, which we acquired as part of a prior acquisition. In cooperation with some of the other companies, we have been conducting initial mitigation and cleanup response pursuant to an administrative order issued by the U.S. Environmental Protection Agency (EPA). The EPA is seeking further cleanup obligations from us and other potentially responsible parties for the Village. In parallel with the Village cleanup, we are also in litigation with the State of Illinois Environmental Protection Agency and other potentially responsible parties relating to the remediation of the shutdown refinery site. In each of these matters, we have various defenses and rights for contribution from the other potentially responsible parties. We have accrued for our own expected contribution obligations. However, because of the unpredictable nature of these cleanups and the methodology for allocation of liabilities, it is reasonably possible that we could incur a loss in a range of $0 to $200 million in excess of the amount of our accrual to ultimately resolve these matters. Factors underlying this estimated range are expected to change from time to time, and actual results may vary significantly from this estimate.
	Litigation Matters
	We are party to claims and legal proceedings arising in the ordinary course of business. We have not recorded a loss contingency liability with respect to some of these matters because we have determined that it is remote that a loss has been incurred. For other matters, we have recorded a loss contingency liability where we have determined that it is probable that a loss has been incurred and that the loss is reasonably estimable. These loss contingency liabilities are not material to our financial position. We re-evaluate and update our loss contingency liabilities as matters progress over time, and we believe that any changes to the recorded liabilities will not be material to our financial position or results of operations.
	One-Time Severance Benefits
	As described in Note 3, we decided to reorganize the Aruba Refinery into a crude oil and refined products terminal in September 2012 resulting in a decrease in required personnel for our operations in Aruba. We notified 495 employees in September 2012 of the termination of their employment effective November 15, 2012. Benefits to each terminated employee consisted primarily of a cash payment based on a formula that considered the employee’s current compensation and years of service, among other factors. We recognized a severance liability of $41 million in September 2012, which approximated fair value. We paid $31 million of these benefits in the fourth quarter of 2012 and we paid the remaining termination benefits of $10 million during the first quarter of 2013.

Equity

Equity	9 Months Ended
	Sep. 30, 2013
Equity [Abstract]	'
EQUITY	'
	7	EQUITY
	Reconciliation of Balances
	The following is a reconciliation of the beginning and ending balances of equity attributable to our stockholders, equity attributable to the noncontrolling interests, and total equity for the nine months ended September 30, 2013 and 2012 (in millions):
			2013												2012
			Valero				Non-				Total				Valero			Non-			Total
			Stockholders’				controlling				Equity				Stockholders’			controlling			Equity
			Equity				Interests								Equity			Interest
	Balance as of		$	18,032			$	63			$	18,095			$	16,423		$	22		$	16,445
	beginning of period
	Net income (loss)		1,432				9				1,441				1,073			(2		)	1,071
	Dividends		(342		)		—				(342		)		(263		)	—			(263		)
	Stock-based		31				—				31				29			—			29
	compensation expense
	Tax deduction in excess		31				—				31				16			—			16
	of stock-based
	compensation expense
	Transactions
	in connection with
	stock-based
	compensation plans:
	Stock issuances		47				—				47				36			—			36
	Stock repurchases		(220		)		—				(220		)		(138		)	—			(138		)
	Stock repurchases under		(396		)		—				(396		)		—			—			—
	buyback program
	Separation of retail business		(479		)		—				(479		)		—			—			—
	Contributions from		—				45				45				—			34			34
	noncontrolling interests
	Other comprehensive		134				—				134				156			—			156
	income
	Balance as of end of period		$	18,270			$	117			$	18,387			$	17,332		$	54		$	17,386
	The noncontrolling interests relate to third-party ownership interests in two joint venture companies, whose financial statements we consolidate due to our controlling interests.
	Share Activity
	Activity in the number of shares of common stock and treasury stock was as follows for the nine months ended September 30, 2013 and 2012 (in millions):
		2013						2012
		Common			Treasury			Common			Treasury
		Stock			Stock			Stock			Stock
	Balance as of beginning of period	673			(121	)		673			(117	)
	Transactions in connection with
	stock-based compensation plans:
	Stock issuances	—			3			—			3
	Stock repurchases	—			(5	)		—			(6	)
	Stock repurchases under buyback program	—			(9	)		—			—
	Balance as of end of period	673			(132	)		673			(120	)
	Accumulated Other Comprehensive Income
	Changes in accumulated other comprehensive income by component, net of tax, were as follows for the nine months ended September 30, 2013 (in millions):
		Foreign				Defined				Gains and				Total
		Currency				Benefit				(Losses) on
		Translation				Pension				Cash Flow
		Adjustment				Items				Hedges
	Balance as of December 31, 2012	$	665			$	(558	)		$	1			$	108
	Other comprehensive income (loss)	(87		)		214				(4		)		123
	before reclassifications
	Amounts reclassified from	—				12				(1		)		11
	accumulated other comprehensive
	income (loss)
	Net other comprehensive income (loss)	(87		)		226				(5		)		134
	Separation of retail business	(159		)		—				—				(159		)
	Balance as of September 30, 2013	$	419			$	(332	)		$	(4	)		$	83
	Gains (losses) reclassified out of accumulated other comprehensive income and into net income were as follows (in millions):
	Details about		Three Months Ended				Nine Months Ended				Affected Line
	Accumulated Other		30-Sep-13				30-Sep-13				Item in the
	Comprehensive Income										Statement of
	Components										Income
Amortization of items related to
defined benefit pension plans:
Net actuarial loss		$	(14	)		$	(43	)		(a)
Prior service credit		9				24				(a)
		(5		)		(19		)		Total before tax
		2				7				Tax benefit
		$	(3	)		$	(12	)		Net of tax
Gains on cash flow hedges:
Commodity contracts		$	6			$	1			Cost of sales
		6				1				Total before tax
		(2		)		—				Tax expense
		$	4			$	1			Net of tax
Total reclassifications for the period		$	1			$	(11	)		Net of tax
_________________________
(a)	These accumulated other comprehensive income (loss) components are included in the computation of net periodic benefit cost, as further discussed in Note 8. Net periodic benefit cost is reflected in operating expenses and general and administrative expenses.

Employee_Benefit_Plans

Employee Benefit Plans	9 Months Ended
	Sep. 30, 2013
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]	'
EMPLOYEE BENEFIT PLANS	'
	8	EMPLOYEE BENEFIT PLANS
	The components of net periodic benefit cost related to our defined benefit plans were as follows (in millions) :
		Pension Plans						Other Postretirement
								Benefit Plans
		2013			2012			2013			2012
	Three months ended September 30:
	Service cost	$	34		$	35		$	3		$	3
	Interest cost	21			23			4			5
	Expected return on plan assets	(33		)	(31		)	—			—
	Amortization of:
	Net actuarial loss	14			8			—			—
	Prior service cost (credit)	(5		)	1			(4		)	(6		)
	Net periodic benefit cost	$	31		$	36		$	3		$	2
	Nine months ended September 30:
	Service cost	$	105		$	105		$	9		$	9
	Interest cost	65			69			13			16
	Expected return on plan assets	(99		)	(93		)	—			—
	Amortization of:
	Net actuarial loss	43			25			—			—
	Prior service cost (credit)	(14		)	2			(10		)	(17		)
	Net periodic benefit cost	$	100		$	108		$	12		$	8
	On February 15, 2013, we announced changes to certain of our U.S. qualified pension plans that cover the majority of our U.S. employees who work in our refining segment and corporate operations. Benefits under our primary pension plan will change from a final average pay formula to a cash balance formula with staged effective dates that commence either on July 1, 2013 or January 1, 2015 depending on the age and service of the affected employees. All final average pay benefits will be frozen as of December 31, 2014, with all future benefits to be earned under the new cash balance formula. These plan amendments resulted in a $328 million decrease to pension liabilities and a related increase to other comprehensive income during the nine months ended September 30, 2013. The benefit of this remeasurement will be amortized into income through 2025.
	As a result of these plan amendments, management reduced its discretionary contributions to our pension plans by $100 million, resulting in expected contributions to our pension plans of $45 million for 2013. During the nine months ended September 30, 2013 and 2012, we contributed $23 million and $137 million, respectively, to our pension plans and $13 million and $14 million, respectively, to our other postretirement benefit plans.

Earnings_Per_Common_Share

Earnings Per Common Share	9 Months Ended
	Sep. 30, 2013
Earnings Per Share [Abstract]	'
EARNINGS PER COMMON SHARE	'
	9	EARNINGS PER COMMON SHARE
	Earnings per common share were computed as follows (dollars and shares in millions, except per share amounts):
		Three Months Ended September 30,
		2013						2012
		Restricted			Common			Restricted		Common
		Stock			Stock			Stock		Stock
	Earnings per common share:
	Net income attributable to Valero stockholders				$	312				$	674
	Less dividends paid:
	Common stock				121					96
	Nonvested restricted stock				1					1
	Undistributed earnings				$	190				$	577
	Weighted-average common shares outstanding	3			540			3		549
	Earnings per common share:
	Distributed earnings	$	0.23		$	0.23		$	0.18	$	0.18
	Undistributed earnings	0.35			0.35			1.04		1.04
	Total earnings per common share	$	0.58		$	0.58		$	1.22	$	1.22
	Earnings per common share –
	assuming dilution:
	Net income attributable to Valero stockholders				$	312				$	674
	Weighted-average common shares outstanding				540					549
	Common equivalent shares:
	Stock options				3					4
	Performance awards and				2					3
	nonvested restricted stock
	Weighted-average common shares outstanding –				545					556
	assuming dilution
	Earnings per common share – assuming dilution				$	0.57				$	1.21
		Nine Months Ended September 30,
		2013						2012
		Restricted			Common			Restricted		Common
		Stock			Stock			Stock		Stock
	Earnings per common share:
	Net income attributable to Valero stockholders				$	1,432				$	1,073
	Less dividends paid:
	Common stock				340					261
	Nonvested restricted stock				2					2
	Undistributed earnings				$	1,090				$	810
	Weighted-average common shares outstanding	3			544			3		550
	Earnings per common share:
	Distributed earnings	$	0.63		$	0.63		$	0.48	$	0.48
	Undistributed earnings	1.99			1.99			1.46		1.46
	Total earnings per common share	$	2.62		$	2.62		$	1.94	$	1.94
	Earnings per common share –
	assuming dilution:
	Net income attributable to Valero stockholders				$	1,432				$	1,073
	Weighted-average common shares outstanding				544					550
	Common equivalent shares:
	Stock options				3					4
	Performance awards and				2					2
	nonvested restricted stock
	Weighted-average common shares outstanding –				549					556
	assuming dilution
	Earnings per common share – assuming dilution				$	2.61				$	1.93
	The following table reflects potentially dilutive securities (in millions) that were excluded from the calculation of “earnings per common share – assuming dilution” as the effect of including such securities would have been antidilutive. Stock options were excluded from weighted-average common shares outstanding – assuming dilution because the exercise price of the stock option was greater than the average market price of our common shares during each reporting period.
		Three Months Ended					Nine Months Ended
		September 30,					September 30,
		2013		2012			2013		2012
	Stock options	3		5			3		6

Segment_Information

Segment Information	9 Months Ended
	Sep. 30, 2013
Segment Reporting [Abstract]	'
SEGMENT INFORMATION	'
	10	SEGMENT INFORMATION
	As discussed in Note 2, we completed the separation of our retail business on May 1, 2013. Segment activity related to our retail business prior to the separation is reflected in the retail segment results below. Motor fuel sales to CST (our former retail business), which were eliminated in consolidation prior to the separation, are reported as refining segment operating revenues from external customers after May 1, 2013.
	The following table reflects activity related to our reportable segments (in millions):
			Refining			Retail		Ethanol			Corporate			Total
	Three months ended September 30, 2013:
	Operating revenues from external		$	34,747		$	—	$	1,390		$	—		$	36,137
	customers
	Intersegment revenues		—			—		16			—			16
	Operating income (loss)		600			—		113			(181		)	532
	Three months ended September 30, 2012:
	Operating revenues from external		30,543			3,092		1,091			—			34,726
	customers
	Intersegment revenues		2,348			—		15			—			2,363
	Operating income (loss)		1,528			41		(73		)	(187		)	1,309
	Nine months ended September 30, 2013:
	Operating revenues from external		95,864			3,896		3,885			—			103,645
	customers
	Intersegment revenues		2,876			—		86			—			2,962
	Operating income (loss)		2,733			81		222			(635		)	2,401
	Nine months ended September 30, 2012:
	Operating revenues from external		92,181			9,089		3,285			—			104,555
	customers
	Intersegment revenues		6,806			—		75			—			6,881
	Operating income (loss)		2,773			253		(59		)	(541		)	2,426
	Total assets by reportable segment were as follows (in millions):
		September 30,			December 31,
		2013			2012
	Refining	$	43,035		$	39,490
	Retail	—			2,043
	Ethanol	879			929
	Corporate	2,379			2,015
	Total assets	$	46,293		$	44,477

Supplemental_Cash_Flow_Informa

Supplemental Cash Flow Information	9 Months Ended
	Sep. 30, 2013
Supplemental Cash Flow Information [Abstract]	'
SUPPLEMENTAL CASH FLOW INFORMATION	'
	11	SUPPLEMENTAL CASH FLOW INFORMATION
	In order to determine net cash provided by operating activities, net income is adjusted by, among other things, changes in current assets and current liabilities as follows (in millions):
		Nine Months Ended
		September 30,
		2013			2012
	Decrease (increase) in current assets:
	Receivables, net	$	(1,135	)	$	1,133
	Inventories	(1,335		)	(116		)
	Income taxes receivable	(122		)	172
	Prepaid expenses and other	8			(25		)
	Increase (decrease) in current liabilities:
	Accounts payable	2,031			(150		)
	Accrued expenses	51			10
	Taxes other than income taxes	276			55
	Income taxes payable	(5		)	112
	Changes in current assets and current liabilities	$	(231	)	$	1,191
	The above changes in current assets and current liabilities differ from changes between amounts reflected in the applicable balance sheets for the respective periods for the following reasons:
	•	the amounts shown above exclude changes in cash and temporary cash investments, deferred income taxes, and current portion of debt and capital lease obligations, as well as the effect of certain noncash investing and financing activities discussed below;
	•	the amounts shown above for the nine months ended September 30, 2013 exclude the change in current assets and current liabilities resulting from the separation of our retail business as described in Note 2;
	•	amounts accrued for capital expenditures and deferred turnaround and catalyst costs are reflected in investing activities when such amounts are paid;
	•	amounts accrued for common stock purchases in the open market that are not settled as of the balance sheet date are reflected in financing activities when the purchases are settled and paid; and
	•	certain differences between balance sheet changes and the changes reflected above result from translating foreign currency denominated balances at the applicable exchange rates as of each balance sheet date.
	There were no significant noncash investing activities for the nine months ended September 30, 2013. Noncash financing activities for the nine months ended September 30, 2013 included the exchange of CST’s senior unsecured bonds with the third-party financial institution in satisfaction of our short-term debt as described in Note 2.
	There were no significant noncash investing or financing activities for the nine months ended September 30, 2012.
	Cash flows related to interest and income taxes were as follows (in millions):
		Nine Months Ended
		September 30,
		2013			2012
	Interest paid in excess of amount capitalized	$	237		$	206
	Income taxes paid, net	347			238

Fair_Value_Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2013
Fair Value Disclosures [Abstract]	'
FAIR VALUE MEASUREMENTS	'
	12	FAIR VALUE MEASUREMENTS
	General
	GAAP requires that certain assets and liabilities be measured at fair value on a recurring or nonrecurring basis in our balance sheets, which are presented below under “Recurring Fair Value Measurements” and “Nonrecurring Fair Value Measurements.” Recurring fair value measurements of assets or liabilities are those that GAAP requires or permits in the balance sheet at the end of each reporting period, such as derivative financial instruments. Nonrecurring fair value measurements of assets or liabilities are those that GAAP requires or permits in the balance sheet in particular circumstances, such as the impairment of property, plant and equipment.
	GAAP also requires the disclosure of the fair values of financial instruments when an option to elect fair value accounting has been provided, but such election has not been made. A debt obligation is an example of such a financial instrument. The disclosure of the fair values of financial instruments not recognized at fair value in our balance sheet is presented below under “Other Financial Instruments.”
	GAAP provides a framework for measuring fair value and establishes a three-level fair value hierarchy that prioritizes inputs to valuation techniques based on the degree to which objective prices in external active markets are available to measure fair value. Following is a description of each of the levels of the fair value hierarchy.
	•	Level 1 - Observable inputs, such as unadjusted quoted prices in active markets for identical assets or liabilities.
	•	Level 2 - Inputs other than quoted prices included within Level 1 that are observable for the asset or liability, either directly or indirectly. These include quoted prices for similar assets or liabilities in active markets and quoted prices for identical or similar assets or liabilities in markets that are not active.
	•	Level 3 - Unobservable inputs for the asset or liability. Unobservable inputs reflect our own assumptions about what market participants would use to price the asset or liability. The inputs are developed based on the best information available in the circumstances, which might include occasional market quotes or sales of similar instruments or our own financial data such as internally developed pricing models, discounted cash flow methodologies, as well as instruments for which the fair value determination requires significant judgment.
	Recurring Fair Value Measurements
	The tables below present information (in millions) about our assets and liabilities recognized at their fair values in our balance sheets categorized according to the fair value hierarchy of the inputs utilized by us to determine the fair values as of September 30, 2013 and December 31, 2012.
	We have elected to offset the fair value amounts recognized for multiple similar derivative contracts executed with the same counterparty, including any related cash collateral assets or obligations as shown below; however, fair value amounts by hierarchy level are presented on a gross basis in the tables below. We have no derivative contracts that are subject to master netting arrangements that are reflected gross on the balance sheet.
		30-Sep-13
								Total		Effect of			Effect of			Net		Cash
								Gross		Counter-			Cash			Carrying		Collateral
								Fair		party			Collateral			Value on		Paid or
		Fair Value Hierarchy						Value		Netting			Netting			Balance		Received
		Level 1		Level 2		Level 3										Sheet		Not Offset
	Assets:
	Commodity derivative	$	1,345	$	26	$	—	$	1,371	$	(1,331	)	$	(5	)	$	35	$	—
	contracts
	Investments of certain	92		—		11		103		N/A			N/A			103		N/A
	benefit plans
	Total	$	1,437	$	26	$	11	$	1,474	$	(1,331	)	$	(5	)	$	138
	Liabilities:
	Commodity derivative	$	1,314	$	37	$	—	$	1,351	$	(1,331	)	$	(12	)	$	8	$	(79	)
	contracts
	Physical purchase	—		17		—		17		N/A			N/A			17		N/A
	contracts
	Foreign currency contracts	5		—		—		5		N/A			N/A			5		N/A
	Total	$	1,319	$	54	$	—	$	1,373	$	(1,331	)	$	(12	)	$	30
		31-Dec-12
								Total		Effect of			Effect of			Net		Cash
								Gross		Counter-			Cash			Carrying		Collateral
								Fair		party			Collateral			Value on		Paid or
		Fair Value Hierarchy						Value		Netting			Netting			Balance		Received
		Level 1		Level 2		Level 3										Sheet		Not Offset
	Assets:
	Commodity derivative	$	1,143	$	60	$	—	$	1,203	$	(1,189	)	$	—		$	14	$	—
	contracts
	Physical purchase contracts	—		11		—		11		N/A			N/A			11		N/A
	Foreign currency	1		—		—		1		N/A			N/A			1		N/A
	contracts
	Investments of certain benefit plans	87		—		11		98		N/A			N/A			98		N/A
	Total	$	1,231	$	71	$	11	$	1,313	$	(1,189	)	$	—		$	124
	Liabilities:
	Commodity derivative	$	1,138	$	70	$	—	$	1,208	$	(1,189	)	$	(13	)	$	6	$	(114	)
	contracts
	Biofuels blending obligation	—		10		—		10		N/A			N/A			10		N/A
	Foreign currency	1		—		—		1		N/A			N/A			1		N/A
	contracts
	Total	$	1,139	$	80	$	—	$	1,219	$	(1,189	)	$	(13	)	$	17
	A description of our assets and liabilities recognized at fair value along with the valuation methods and inputs we used to develop their fair value measurements are as follows:
	•	Commodity derivative contracts consist primarily of exchange-traded futures and swaps, and as disclosed in Note 13, some of these contracts are designated as hedging instruments. These contracts are measured at fair value using the market approach. Exchange-traded futures are valued based on quoted prices from the exchange and are categorized in Level 1 of the fair value hierarchy. Swaps are priced using third-party broker quotes, industry pricing services, and exchange-traded curves, with appropriate consideration of counterparty credit risk, but because they have contractual terms that are not identical to exchange-traded futures instruments with a comparable market price, these financial instruments are categorized in Level 2 of the fair value hierarchy.
	•	Physical purchase contracts represent the fair value of firm commitments to purchase crude oil feedstocks and the fair value of fixed-price corn purchase contracts, and as disclosed in Note 13, some of these contracts are designated as hedging instruments. The fair values of these firm commitments and purchase contracts are measured using a market approach based on quoted prices from the commodity exchange or an independent pricing service and are categorized in Level 2 of the fair value hierarchy.
	•	Investments of certain benefit plans consist of investment securities held by trusts for the purpose of satisfying a portion of our obligations under certain U.S. nonqualified benefit plans. The assets categorized in Level 1 of the fair value hierarchy are measured at fair value using a market approach based on quoted prices from national securities exchanges. The assets categorized in Level 3 of the fair value hierarchy represent insurance contracts, the fair value of which is provided by the insurer.
	•	Foreign currency contracts consist of foreign currency exchange and purchase contracts entered into by our international operations to manage our exposure to exchange rate fluctuations on transactions denominated in currencies other than the local (functional) currencies of those operations. These contracts are valued based on quoted prices from the exchange and are categorized in Level 1 of the fair value hierarchy.
	•	Our biofuels blending obligation represents a liability for the purchase of biofuel credits (primarily RINs in the U.S.) needed to satisfy our obligation to blend biofuels into the products we produce. To the degree we are unable to blend at percentages required under various governmental and regulatory programs, we must purchase biofuel credits to comply with these programs. These programs are further described in Note 13 under “Compliance Program Risk.” This liability is based on our deficit in biofuel credits as of the balance sheet date, if any, after considering any biofuel credits acquired or under contract, and is equal to the product of the biofuel credits deficit and the market price of these credits as of the balance sheet date. This liability is categorized in Level 2 of the fair value hierarchy and is measured at fair value using the market approach based on quoted prices from an independent pricing service.
	There were no transfers between Level 1 and Level 2 for assets and liabilities held as of September 30, 2013 and December 31, 2012 that were measured at fair value on a recurring basis.
	There was no activity during the three and nine months ended September 30, 2013 and 2012 related to the fair value amounts categorized in Level 3 as of September 30, 2013 and December 31, 2012.
	Nonrecurring Fair Value Measurements
	There were no assets or liabilities that were measured at fair value on a nonrecurring basis as of September 30, 2013.
	The table below presents the fair value of certain assets that were measured at fair value on a nonrecurring basis as of December 31, 2012 (in millions).
								Total
Fair Value
as of
	Fair Value Hierarchy						December 31,
	Level 1		Level 2		Level 3		2012
Cancelled capital project	$	—	$	—	$	2	$	2
Property, plant and equipment of	—		—		8		8
convenience stores
There were no liabilities that were measured at fair value on a nonrecurring basis as of December 31, 2012.
As discussed in Note 3, during the nine months ended September 30, 2012, we recognized asset impairment losses of $928 million, $16 million, and $12 million related to our Aruba Refinery, certain equipment associated with a permanently cancelled capital project at one of our refineries, and certain convenience stores operated by our former retail segment, respectively. These impairment losses resulted from the fair value measurement of those assets on a nonrecurring basis during 2012 as follows:
•	As of March 31, 2012, we concluded that the Aruba Refinery was impaired. As a result, we were required to determine the fair value of the Aruba Refinery and to write down its carrying value to that amount. We determined that the best measure of the refinery’s fair value at that time was the $350 million offer we received to purchase the refinery, which we accepted. The fair value of the Aruba Refinery was measured using the market approach and was categorized in Level 3 within the fair value hierarchy. The carrying value of the Aruba Refinery’s long-lived assets as of March 31, 2012 was $945 million; therefore, we recognized an asset impairment loss of $595 million in March 2012.
•	In March 2012, we wrote down the carrying value of equipment associated with a permanently cancelled capital project at one of our refineries and recognized an asset impairment loss of $16 million.
•	In September 2012, following the withdrawal of the offer to purchase the refinery, we decided to reorganize the Aruba Refinery into a crude oil and refined products terminal and evaluated the refining assets for potential impairment as of September 30, 2012. We concluded that these refining assets were impaired and determined that their carrying value was not recoverable through the future operations and disposition of the refinery, resulting in a total asset impairment loss of $333 million in September 2012.
•	As of September 30, 2012, we evaluated certain convenience stores operated by our former retail segment for potential impairment and concluded that they were impaired. We wrote down the carrying values of these stores to their estimated fair values, which totaled $5 million, and recognized an asset impairment loss of $12 million that was recorded in September 2012.
Other Financial Instruments
Financial instruments that we recognize in our balance sheets at their carrying amounts are shown in the table below (in millions):
	September 30, 2013				December 31, 2012
	Carrying		Fair		Carrying		Fair
	Amount		Value		Amount		Value
Financial assets:
Cash and temporary cash investments	$	1,908	$	1,908	$	1,723	$	1,723
Equity investment in CST	119		449		—		—
Financial liabilities:
Debt (excluding capital leases)	6,524		7,545		7,000		8,621
The methods and significant assumptions used to estimate the fair value of these financial instruments are as follows:
•	The fair value of cash and temporary cash investments approximates the carrying value due to the low level of credit risk of these assets combined with their short maturities and market interest rates (Level 1).
•	The fair value of our equity investment in CST is determined using the market approach based on the quoted price of CST stock from a national securities exchange (Level 1).
•	The fair value of debt is determined primarily using the market approach based on quoted prices provided by third-party brokers and vendor pricing services (Level 2).

Price_Risk_Management_Activiti

Price Risk Management Activities	9 Months Ended
	Sep. 30, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'
PRICE RISK MANAGEMENT ACTIVITIES	'
	13	PRICE RISK MANAGEMENT ACTIVITIES
	General
	We are exposed to market risks related to the volatility in the price of commodities, interest rates, and foreign currency exchange rates. We enter into derivative instruments to manage some of these risks, including derivative instruments related to the various commodities we purchase or produce, interest rate swaps, and foreign currency exchange and purchase contracts, as described below under “Risk Management Activities by Type of Risk.” These derivative instruments are recorded as either assets or liabilities measured at their fair values (see Note 12), as summarized below under “Fair Values of Derivative Instruments.” In addition, the effect of these derivative instruments on our income is summarized below under “Effect of Derivative Instruments on Income and Other Comprehensive Income.”
	When we enter into a derivative instrument, it is designated as a fair value hedge, a cash flow hedge, an economic hedge, or a trading derivative. The gain or loss on a derivative instrument designated and qualifying as a fair value hedge, as well as the offsetting loss or gain on the hedged item attributable to the hedged risk, is recognized currently in income in the same period. The effective portion of the gain or loss on a derivative instrument designated and qualifying as a cash flow hedge is initially reported as a component of other comprehensive income and is then recorded into income in the period or periods during which the hedged forecasted transaction affects income. The ineffective portion of the gain or loss on the cash flow derivative instrument, if any, is recognized in income as incurred. For our economic hedges (derivative instruments not designated as fair value or cash flow hedges) and for derivative instruments entered into by us for trading purposes, the derivative instrument is recorded at fair value and changes in the fair value of the derivative instrument are recognized currently in income. The cash flow effects of all of our derivative instruments are reflected in operating activities in our statements of cash flows for all periods presented.
	We are also exposed to market risk related to the volatility in the price of credits needed to comply with various governmental and regulatory programs. To manage this risk, we enter into contracts to purchase these credits when prices are deemed favorable. Some of these contracts are derivative instruments; however, we elect the normal purchase and sale exception and do not record these contracts at their fair values.
	Risk Management Activities by Type of Risk
	Commodity Price Risk
	We are exposed to market risks related to the volatility in the price of crude oil, refined products (primarily gasoline and distillate), grain (primarily corn), soybean oil, and natural gas used in our operations. To reduce the impact of price volatility on our results of operations and cash flows, we use commodity derivative instruments, including futures, swaps, and options. We use the futures markets for the available liquidity, which provides greater flexibility in transacting our hedging and trading operations. We use swaps primarily to manage our price exposure. Our positions in commodity derivative instruments are monitored and managed on a daily basis by a risk control group to ensure compliance with our stated risk management policy that has been approved by our board of directors.
	For risk management purposes, we use fair value hedges, cash flow hedges, and economic hedges. In addition to the use of derivative instruments to manage commodity price risk, we also enter into certain commodity derivative instruments for trading purposes. Our objective for entering into each type of hedge or trading derivative is described below.
	•	Fair Value Hedges – Fair value hedges are used to hedge price volatility in certain refining inventories and firm commitments to purchase inventories. The level of activity for our fair value hedges is based on the level of our operating inventories, and generally represents the amount by which our inventories differ from our previous year-end LIFO inventory levels.
	As of September 30, 2013, we had the following outstanding commodity derivative instruments that were entered into to hedge crude oil and refined product inventories and commodity derivative instruments related to the physical purchase of crude oil and refined products at a fixed price. The information presents the notional volume of outstanding contracts by type of instrument and year of maturity (volumes in thousands of barrels).
			Notional
			Contract
			Volumes by
			Year of
			Maturity
	Derivative Instrument		2013
	Crude oil and refined products:
	Futures – long		11,986
	Futures – short		15,788
	Physical contracts – long		3,802
	•	Cash Flow Hedges – Cash flow hedges are used to hedge price volatility in certain forecasted feedstock and refined product purchases, refined product sales, and natural gas purchases. The objective of our cash flow hedges is to lock in the price of forecasted feedstock, refined product, or natural gas purchases or refined product sales at existing market prices that we deem favorable.
	As of September 30, 2013, we had the following outstanding commodity derivative instruments that were entered into to hedge forecasted purchases or sales of crude oil and refined products. The information presents the notional volume of outstanding contracts by type of instrument and year of maturity (volumes in thousands of barrels).
			Notional
			Contract
			Volumes by
			Year of
			Maturity
	Derivative Instrument		2013
	Crude oil and refined products:
	Futures – long		5,876
	Futures – short		2,759
	Physical contracts – short		3,117
	•	Economic Hedges – Economic hedges represent commodity derivative instruments that are not designated as fair value or cash flow hedges and are used to manage price volatility in certain (i) refinery feedstock, refined product, and corn inventories, (ii) forecasted refinery feedstock, refined product, and corn purchases, and refined product sales, and (iii) fixed-price corn purchase contracts. Our objective for entering into economic hedges is consistent with the objectives discussed above for fair value hedges and cash flow hedges. However, the economic hedges are not designated as a fair value hedge or a cash flow hedge for accounting purposes, usually due to the difficulty of establishing the required documentation at the date that the derivative instrument is entered into that would allow us to achieve “hedge deferral accounting.”
	As of September 30, 2013, we had the following outstanding commodity derivative instruments that were used as economic hedges and commodity derivative instruments related to the physical purchase of corn at a fixed price. The information presents the notional volume of outstanding contracts by type of instrument and year of maturity (volumes in thousands of barrels, except those identified as natural gas contracts that are presented in billions of British thermal units, corn contracts that are presented in thousands of bushels, and soybean oil contracts that are presented in thousands of pounds).
			Notional Contract Volumes by
			Year of Maturity
	Derivative Instrument		2013			2014			2015
	Crude oil and refined products:
	Swaps – long		2,867			45			—
	Swaps – short		1,797			90			—
	Futures – long		31,357			75			—
	Futures – short		42,753			—			—
	Natural gas:
	Options – long		5,250			—			—
	Corn:
	Futures – long		19,695			5			—
	Futures – short		21,410			1,500			15
	Physical contracts – long		7,682			1,543			—
	Soybean oil:
	Futures – short		26,520			—			—
	•	Trading Derivatives – Our objective for entering into commodity and other derivative instruments for trading purposes is to take advantage of existing market conditions related to future results of operations and cash flows.
	As of September 30, 2013, we had the following outstanding commodity and other derivative instruments that were entered into for trading purposes. The information presents the notional volume of outstanding contracts by type of instrument and year of maturity (volumes represent thousands of barrels, except those identified as natural gas contracts that are presented in billions of British thermal units and corn contracts that are presented in thousands of bushels).
			Notional Contract Volumes by
			Year of Maturity
	Derivative Instrument		2013			2014
	Crude oil and refined products:
	Swaps – long		11,484			21,135
	Swaps – short		11,484			21,135
	Futures – long		121,803			49,298
	Futures – short		122,138			49,223
	Options – long		20,950			10,000
	Options – short		20,250			10,000
Natural gas:
Futures – long		1,150			—
Futures – short		550			—
Options – long		3,000			—
Corn:
Futures – long		3,200			—
Futures – short		2,900			—
Interest Rate Risk
Our primary market risk exposure for changes in interest rates relates to our debt obligations. We manage our exposure to changing interest rates through the use of a combination of fixed-rate and floating-rate debt. In addition, at times we have used interest rate swap agreements to manage our fixed to floating interest rate position by converting certain fixed-rate debt to floating-rate debt. We had no interest rate derivative instruments outstanding as of September 30, 2013 or December 31, 2012, or during the three and nine months ended September 30, 2013 and 2012.
Foreign Currency Risk
We are exposed to exchange rate fluctuations on transactions entered into by our international operations that are denominated in currencies other than the local (functional) currencies of those operations. To manage our exposure to these exchange rate fluctuations, we use foreign currency exchange and purchase contracts. These contracts are not designated as hedging instruments for accounting purposes, and therefore they are classified as economic hedges. As of September 30, 2013, we had commitments to purchase $845 million of U.S. dollars. These commitments matured on or before October 31, 2013, resulting in an immaterial loss in the fourth quarter of 2013.
Compliance Program Price Risk
We are exposed to market risk related to the volatility in the price of credits needed to comply with various governmental and regulatory programs. The most significant programs impacting our operations are those that require us to blend biofuels into the products we produce, and we are subject to such programs in most of the countries in which we operate. These countries set annual quotas for the percentage of biofuels that must be blended into the motor fuels consumed in these countries. As a producer of motor fuels from petroleum, we are obligated to blend biofuels into the products we produce at a rate that is at least equal to the applicable quota. To the degree we are unable to blend at the applicable rate, we must purchase biofuel credits (primarily RINs in the U.S.). We are exposed to the volatility in the market price of these credits, and we manage that risk by purchasing biofuel credits when prices are deemed favorable. The cost of meeting our obligations under these compliance programs was $187 million and $72 million for the three months ended September 30, 2013 and 2012, respectively, and $454 million and $198 million for the nine months ended September 30, 2013 and 2012, respectively. These amounts are reflected in cost of sales.
Fair Values of Derivative Instruments
The following tables provide information about the fair values of our derivative instruments as of September 30, 2013 and December 31, 2012 (in millions) and the line items in the balance sheets in which the fair values are reflected. See Note 12 for additional information related to the fair values of our derivative instruments.
As indicated in Note 12, we net fair value amounts recognized for multiple similar derivative contracts executed with the same counterparty under master netting arrangements, including cash collateral assets and obligations. The tables below, however, are presented on a gross asset and gross liability basis, which results in the reflection of certain assets in liability accounts and certain liabilities in asset accounts.
	Balance Sheet		September 30, 2013
	Location		Asset				Liability
			Derivatives				Derivatives
Derivatives designated as
hedging instruments
Commodity contracts:
Futures	Receivables, net		$	45			$	45
Derivatives not designated as
hedging instruments
Commodity contracts:
Futures	Receivables, net		$	1,300			$	1,267
Swaps	Receivables, net		18				27
Swaps	Prepaid expenses and other		5				—
Swaps	Accrued expenses		1				9
Options	Receivables, net		2				3
Physical purchase contracts	Inventories		—				17
Foreign currency contracts	Accrued expenses		—				5
Total			$	1,326			$	1,328
Total derivatives			$	1,371			$	1,373
	Balance Sheet		December 31, 2012
	Location		Asset				Liability
			Derivatives				Derivatives
Derivatives designated as
hedging instruments
Commodity contracts:
Futures	Receivables, net		$	77			$	64
Swaps	Receivables, net		15				13
Swaps	Prepaid expenses and other		2				2
Total			$	94			$	79
Derivatives not designated as
hedging instruments
Commodity contracts:
Futures	Receivables, net		$	1,066			$	1,073
Swaps	Receivables, net		9				6
Swaps	Accrued expenses		32				46
Options	Receivables, net		1				4
Options	Accrued expenses		1				—
Physical purchase contracts	Inventories		11				—
Foreign currency contracts	Receivables, net		1				—
Foreign currency contracts	Accrued expenses		—				1
Total			$	1,121			$	1,130
Total derivatives			$	1,215			$	1,209
Market and Counterparty Risk
Our price risk management activities involve the receipt or payment of fixed price commitments into the future. These transactions give rise to market risk, which is the risk that future changes in market conditions may make an instrument less valuable. We closely monitor and manage our exposure to market risk on a daily basis in accordance with policies approved by our board of directors. Market risks are monitored by a risk control group to ensure compliance with our stated risk management policy. Concentrations of customers in the refining industry may impact our overall exposure to counterparty risk because these customers may be similarly affected by changes in economic or other conditions. In addition, financial services companies are the counterparties in certain of our price risk management activities, and such financial services companies may be adversely affected by periods of uncertainty and illiquidity in the credit and capital markets.
There were no significant amounts due from counterparties in the refining or financial services industry as of September 30, 2013 or December 31, 2012. We do not require any collateral or other security to support derivative instruments into which we enter. We also do not have any derivative instruments that require us to maintain a minimum investment-grade credit rating.
Effect of Derivative Instruments on Income and Other Comprehensive Income
The following tables provide information about the gain or loss recognized in income and other comprehensive income on our derivative instruments and the line items in the financial statements in which such gains and losses are reflected (in millions).
Derivatives in Fair Value		Location of Gain (Loss)		Three Months Ended							Nine Months Ended
Hedging Relationships		Recognized in Income		September 30,							September 30,
		on Derivatives		2013				2012			2013			2012
Commodity contracts:
Loss recognized in		Cost of sales		$	(17	)		$	(127	)	$	(38	)	$	(307	)
income on derivatives
Gain recognized in		Cost of sales		19				101			41			238
income on hedged item
Gain (loss) recognized in		Cost of sales		2				(26		)	3			(69		)
income on derivatives
(ineffective portion)
For fair value hedges, no component of the derivative instruments’ gains or losses was excluded from the assessment of hedge effectiveness for the three and nine months ended September 30, 2013 and 2012. There were no amounts recognized in income for hedged firm commitments that no longer qualified as fair value hedges during the three or nine months ended September 30, 2013. There were no amounts recognized in income for hedged firm commitments that no longer qualified as fair value hedges during the three months ended September 30, 2012; however, a gain of $28 million was recognized in income during the nine months ended September 30, 2012 for hedged firm commitments that no longer qualified as fair value hedges .
Derivatives in Cash Flow		Location of Gain (Loss)		Three Months Ended							Nine Months Ended
Hedging Relationships		Recognized in Income		September 30,							September 30,
		on Derivatives		2013				2012			2013			2012
Commodity contracts:
Gain (loss) recognized in				$	3			$	27		$	(6	)	$	43
OCI on derivatives
(effective portion)
Gain reclassified from		Cost of sales		6				45			1			81
accumulated OCI into
income (effective
portion)
Gain (loss) recognized in		Cost of sales		16				(3		)	13			23
income on derivatives
(ineffective portion)
For cash flow hedges, no component of the derivative instruments’ gains or losses was excluded from the assessment of hedge effectiveness for the three and nine months ended September 30, 2013 and 2012. For the three and nine months ended September 30, 2013, cash flow hedges primarily related to forward sales of gasoline and distillates, and associated forward purchases of crude oil, with $4 million of cumulative after-tax losses on cash flow hedges remaining in accumulated other comprehensive income. We estimate that $4 million of the deferred loss as of September 30, 2013 will be reclassified into cost of sales over the next 12 months as a result of hedged transactions that are forecasted to occur. For the three and nine months ended September 30, 2013 and 2012, there were no amounts reclassified from accumulated other comprehensive income into income as a result of the discontinuance of cash flow hedge accounting.
Derivatives Designated as		Location of Gain (Loss)		Three Months Ended							Nine Months Ended
Economic Hedges		Recognized in		September 30,							September 30,
and Other		Income on Derivatives
Derivative Instruments				2013				2012			2013			2012
Commodity contracts		Cost of sales		$	(76	)		$	(333	)	$	205		$	90
Foreign currency contracts		Cost of sales		(22		)		(21		)	14			(43		)
Total				$	(98	)		$	(354	)	$	219		$	47
Trading Derivatives		Location of Gain (Loss)		Three Months Ended							Nine Months Ended
		Recognized in		September 30,							September 30,
		Income on Derivatives		2013				2012			2013			2012
Commodity contracts		Cost of sales		$	11			$	(13	)	$	16		$	(9	)
RINs fixed-price contracts		Cost of sales		—				—			(20		)	—
Total				$	11			$	(13	)	$	(4	)	$	(9	)

Valero_Energy_Partners_LP

Valero Energy Partners LP	9 Months Ended
	Sep. 30, 2013
Related Party Transactions [Abstract]	'
VALERO ENERGY PARTNERS LP	'
	14. VALERO ENERGY PARTNERS LP
	On September 19, 2013, Valero Energy Partners LP (VLP), our wholly owned subsidiary, filed a registration statement on Form S-1 with the U.S. Securities and Exchange Commission in connection with a proposed initial public offering of its common units representing limited partner interests. On October 28, 2013, VLP filed an amendment to the Form S-1. The number of common units to be offered and the price per unit have not yet been determined.
	We formed VLP to own, operate, develop, and acquire crude oil and refined petroleum products pipelines, terminals, and other transportation and logistics assets. We intend to contribute assets to VLP that will include crude oil and refined petroleum products pipeline and terminal systems in the U.S. Gulf Coast and U.S. Mid-Continent regions that are integral to the operations of our Port Arthur, McKee, and Memphis Refineries.
	As of the date of this report, the registration statement is not effective. The completion of the offering is subject to numerous conditions, including market conditions, and we can provide no assurance that it will be successfully completed. The information contained in this report is neither an offer to sell nor a solicitation of an offer to buy any of VLP’s common units in the initial public offering.

Basis_of_Presentation_and_Summ1

Basis of Presentation and Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2013
Accounting Policies [Abstract]	'
Basis of Presentation	'
	Basis of Presentation
	As used in this report, the terms “Valero,” “we,” “us,” or “our” may refer to Valero Energy Corporation, one or more of its consolidated subsidiaries, or all of them taken as a whole.
	These unaudited financial statements have been prepared in accordance with United States (U.S.) generally accepted accounting principles (GAAP) for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X of the Securities Exchange Act of 1934. Accordingly, they do not include all of the information and notes required by U.S. GAAP for complete financial statements. In the opinion of management, all adjustments considered necessary for a fair presentation have been included. All such adjustments are of a normal recurring nature unless disclosed otherwise. Financial information for the three and nine months ended September 30, 2013 and 2012 included in these Condensed Notes to Consolidated Financial Statements is derived from our unaudited financial statements. Operating results for the three and nine months ended September 30, 2013 are not necessarily indicative of the results that may be expected for the year ending December 31, 2013.
	The balance sheet as of December 31, 2012 has been derived from our audited financial statements as of that date. For further information, refer to our financial statements and notes thereto included in our annual report on Form 10-K for the year ended December 31, 2012.
Use of Estimates	'
	Use of Estimates
	The preparation of financial statements in conformity with U.S. GAAP requires us to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from those estimates. On an ongoing basis, we review our estimates based on currently available information. Changes in facts and circumstances may result in revised estimates.
Offsetting fair value amounts of commodity derivative contracts	'
	We have elected to offset the fair value amounts recognized for multiple similar derivative contracts executed with the same counterparty, including any related cash collateral assets or obligations as shown below; however, fair value amounts by hierarchy level are presented on a gross basis in the tables below. We have no derivative contracts that are subject to master netting arrangements that are reflected gross on the balance sheet.
Derivatives	'
	We are exposed to market risks related to the volatility in the price of commodities, interest rates, and foreign currency exchange rates. We enter into derivative instruments to manage some of these risks, including derivative instruments related to the various commodities we purchase or produce, interest rate swaps, and foreign currency exchange and purchase contracts, as described below under “Risk Management Activities by Type of Risk.” These derivative instruments are recorded as either assets or liabilities measured at their fair values (see Note 12), as summarized below under “Fair Values of Derivative Instruments.” In addition, the effect of these derivative instruments on our income is summarized below under “Effect of Derivative Instruments on Income and Other Comprehensive Income.”
	When we enter into a derivative instrument, it is designated as a fair value hedge, a cash flow hedge, an economic hedge, or a trading derivative. The gain or loss on a derivative instrument designated and qualifying as a fair value hedge, as well as the offsetting loss or gain on the hedged item attributable to the hedged risk, is recognized currently in income in the same period. The effective portion of the gain or loss on a derivative instrument designated and qualifying as a cash flow hedge is initially reported as a component of other comprehensive income and is then recorded into income in the period or periods during which the hedged forecasted transaction affects income. The ineffective portion of the gain or loss on the cash flow derivative instrument, if any, is recognized in income as incurred. For our economic hedges (derivative instruments not designated as fair value or cash flow hedges) and for derivative instruments entered into by us for trading purposes, the derivative instrument is recorded at fair value and changes in the fair value of the derivative instrument are recognized currently in income. The cash flow effects of all of our derivative instruments are reflected in operating activities in our statements of cash flows for all periods presented.
Derivative instruments collateral requirements	'
	We do not require any collateral or other security to support derivative instruments into which we enter.

Separation_of_Retail_Business_

Separation of Retail Business (Tables)	9 Months Ended
	Sep. 30, 2013
Disposal Group, Not Discontinued Operation, Disposal Disclosures [Abstract]	'
Carrying value of retail business assets and liabilities prior to separation	'
	The following table presents the carrying values of the major categories of assets and liabilities of our retail business, immediately preceding its separation on May 1, 2013, which are excluded from our consolidated balance sheet as of September 30, 2013 (in millions):
	Assets
	Cash and temporary cash investments	$	315
	Credit card receivables from Valero	44
	Other receivables, net	109
	Inventories	170
	Deferred income taxes	14
	Prepaid expenses and other	13
	Total current assets	665
	Property, plant and equipment, at cost	1,891
	Accumulated depreciation	(611		)
	Property, plant and equipment, net	1,280
	Intangible assets, net	38
	Deferred charges and other assets, net	191
	Total assets	$	2,174
	Liabilities
	Current portion of capital lease obligations	$	2
	Trade payable to Valero	242
	Other accounts payable	96
	Accrued expenses	31
	Taxes other than income taxes	20
	Total current liabilities	391
	Debt and capital lease obligations, less current portion	1,053
	Deferred income taxes	83
	Other long-term liabilities	112
	Total liabilities	$	1,639

Inventories_Tables

Inventories (Tables)	9 Months Ended
	Sep. 30, 2013
Inventory Disclosure [Abstract]	'
Schedule of inventories	'
	Inventories consisted of the following (in millions):
		September 30,		December 31,
		2013		2012
	Refinery feedstocks	$	3,109	$	2,458
	Refined products and blendstocks	3,582		2,995
	Ethanol feedstocks and products	148		191
	Convenience store merchandise	—		112
	Materials and supplies	224		217
	Inventories	$	7,063	$	5,973

Debt_Tables

Debt (Tables)	9 Months Ended
	Sep. 30, 2013
Debt Disclosure [Abstract]	'
Outstanding letters of credit under committed lines of credit	'
	We had outstanding letters of credit under our committed lines of credit as follows (in millions):
								Amounts Outstanding
			Borrowing			Expiration		September 30,		December 31,
			Capacity					2013		2012
	Letter of credit facilities		$	550		Jun-14		$	292	$	418
	Revolver		$	3,000		Dec-16		$	59	$	59
	Canadian revolving credit facility		C$	50		Nov-13		C$	10	C$	10
Changes in accounts receivable sales facility	'
	Changes in the amounts outstanding under our accounts receivable sales facility were as follows (in millions):
		Nine Months Ended
		September 30,
		2013			2012
	Balance as of beginning of period	$	100		$	250
	Proceeds from the sale of receivables	—			1,500
	Repayments	—			(1,650		)
	Balance as of end of period	$	100		$	100

Equity_Tables

Equity (Tables)	9 Months Ended
	Sep. 30, 2013
Equity [Abstract]	'
Schedule of changes in equity	'
	The following is a reconciliation of the beginning and ending balances of equity attributable to our stockholders, equity attributable to the noncontrolling interests, and total equity for the nine months ended September 30, 2013 and 2012 (in millions):
			2013												2012
			Valero				Non-				Total				Valero			Non-			Total
			Stockholders’				controlling				Equity				Stockholders’			controlling			Equity
			Equity				Interests								Equity			Interest
	Balance as of		$	18,032			$	63			$	18,095			$	16,423		$	22		$	16,445
	beginning of period
	Net income (loss)		1,432				9				1,441				1,073			(2		)	1,071
	Dividends		(342		)		—				(342		)		(263		)	—			(263		)
	Stock-based		31				—				31				29			—			29
	compensation expense
	Tax deduction in excess		31				—				31				16			—			16
	of stock-based
	compensation expense
	Transactions
	in connection with
	stock-based
	compensation plans:
	Stock issuances		47				—				47				36			—			36
	Stock repurchases		(220		)		—				(220		)		(138		)	—			(138		)
	Stock repurchases under		(396		)		—				(396		)		—			—			—
	buyback program
	Separation of retail business		(479		)		—				(479		)		—			—			—
	Contributions from		—				45				45				—			34			34
	noncontrolling interests
	Other comprehensive		134				—				134				156			—			156
	income
	Balance as of end of period		$	18,270			$	117			$	18,387			$	17,332		$	54		$	17,386
Schedule of stock by class	'
	Activity in the number of shares of common stock and treasury stock was as follows for the nine months ended September 30, 2013 and 2012 (in millions):
		2013						2012
		Common			Treasury			Common			Treasury
		Stock			Stock			Stock			Stock
	Balance as of beginning of period	673			(121	)		673			(117	)
	Transactions in connection with
	stock-based compensation plans:
	Stock issuances	—			3			—			3
	Stock repurchases	—			(5	)		—			(6	)
	Stock repurchases under buyback program	—			(9	)		—			—
	Balance as of end of period	673			(132	)		673			(120	)
Schedule of accumulated other comprehensive income (loss)	'
	Changes in accumulated other comprehensive income by component, net of tax, were as follows for the nine months ended September 30, 2013 (in millions):
		Foreign				Defined				Gains and				Total
		Currency				Benefit				(Losses) on
		Translation				Pension				Cash Flow
		Adjustment				Items				Hedges
	Balance as of December 31, 2012	$	665			$	(558	)		$	1			$	108
	Other comprehensive income (loss)	(87		)		214				(4		)		123
	before reclassifications
	Amounts reclassified from	—				12				(1		)		11
	accumulated other comprehensive
	income (loss)
	Net other comprehensive income (loss)	(87		)		226				(5		)		134
	Separation of retail business	(159		)		—				—				(159		)
	Balance as of September 30, 2013	$	419			$	(332	)		$	(4	)		$	83
Reclassification out of accumulated other comprehensive income (loss)	'
	Gains (losses) reclassified out of accumulated other comprehensive income and into net income were as follows (in millions):
	Details about		Three Months Ended				Nine Months Ended				Affected Line
	Accumulated Other		30-Sep-13				30-Sep-13				Item in the
	Comprehensive Income										Statement of
	Components										Income
	Amortization of items related to
	defined benefit pension plans:
	Net actuarial loss		$	(14	)		$	(43	)		(a)
	Prior service credit		9				24				(a)
			(5		)		(19		)		Total before tax
			2				7				Tax benefit
			$	(3	)		$	(12	)		Net of tax
	Gains on cash flow hedges:
	Commodity contracts		$	6			$	1			Cost of sales
			6				1				Total before tax
			(2		)		—				Tax expense
			$	4			$	1			Net of tax
	Total reclassifications for the period		$	1			$	(11	)		Net of tax
	_________________________
	(a)	These accumulated other comprehensive income (loss) components are included in the computation of net periodic benefit cost, as further discussed in Note 8. Net periodic benefit cost is reflected in operating expenses and general and administrative expenses.

Employee_Benefit_Plans_Tables

Employee Benefit Plans (Tables)	9 Months Ended
	Sep. 30, 2013
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]	'
Periodic benefit cost related to our defined benefit plans, net	'
	The components of net periodic benefit cost related to our defined benefit plans were as follows (in millions) :
		Pension Plans						Other Postretirement
								Benefit Plans
		2013			2012			2013			2012
	Three months ended September 30:
	Service cost	$	34		$	35		$	3		$	3
	Interest cost	21			23			4			5
	Expected return on plan assets	(33		)	(31		)	—			—
	Amortization of:
	Net actuarial loss	14			8			—			—
	Prior service cost (credit)	(5		)	1			(4		)	(6		)
	Net periodic benefit cost	$	31		$	36		$	3		$	2
	Nine months ended September 30:
	Service cost	$	105		$	105		$	9		$	9
	Interest cost	65			69			13			16
	Expected return on plan assets	(99		)	(93		)	—			—
	Amortization of:
	Net actuarial loss	43			25			—			—
	Prior service cost (credit)	(14		)	2			(10		)	(17		)
	Net periodic benefit cost	$	100		$	108		$	12		$	8

Earnings_Per_Common_Share_Tabl

Earnings Per Common Share (Tables)	9 Months Ended
	Sep. 30, 2013
Earnings Per Share [Abstract]	'
Schedule of earnings per common share, basic and diluted	'
	Earnings per common share were computed as follows (dollars and shares in millions, except per share amounts):
		Three Months Ended September 30,
		2013						2012
		Restricted			Common			Restricted		Common
		Stock			Stock			Stock		Stock
	Earnings per common share:
	Net income attributable to Valero stockholders				$	312				$	674
	Less dividends paid:
	Common stock				121					96
	Nonvested restricted stock				1					1
	Undistributed earnings				$	190				$	577
	Weighted-average common shares outstanding	3			540			3		549
	Earnings per common share:
	Distributed earnings	$	0.23		$	0.23		$	0.18	$	0.18
	Undistributed earnings	0.35			0.35			1.04		1.04
	Total earnings per common share	$	0.58		$	0.58		$	1.22	$	1.22
	Earnings per common share –
	assuming dilution:
	Net income attributable to Valero stockholders				$	312				$	674
	Weighted-average common shares outstanding				540					549
	Common equivalent shares:
	Stock options				3					4
	Performance awards and				2					3
	nonvested restricted stock
	Weighted-average common shares outstanding –				545					556
	assuming dilution
	Earnings per common share – assuming dilution				$	0.57				$	1.21
		Nine Months Ended September 30,
		2013						2012
		Restricted			Common			Restricted		Common
		Stock			Stock			Stock		Stock
	Earnings per common share:
	Net income attributable to Valero stockholders				$	1,432				$	1,073
	Less dividends paid:
	Common stock				340					261
	Nonvested restricted stock				2					2
	Undistributed earnings				$	1,090				$	810
	Weighted-average common shares outstanding	3			544			3		550
	Earnings per common share:
	Distributed earnings	$	0.63		$	0.63		$	0.48	$	0.48
	Undistributed earnings	1.99			1.99			1.46		1.46
	Total earnings per common share	$	2.62		$	2.62		$	1.94	$	1.94
	Earnings per common share –
	assuming dilution:
	Net income attributable to Valero stockholders				$	1,432				$	1,073
	Weighted-average common shares outstanding				544					550
	Common equivalent shares:
	Stock options				3					4
	Performance awards and				2					2
	nonvested restricted stock
	Weighted-average common shares outstanding –				549					556
	assuming dilution
	Earnings per common share – assuming dilution				$	2.61				$	1.93
Potentially dilutive securities excluded from calculation of earnings per common share - assuming dilution	'
	The following table reflects potentially dilutive securities (in millions) that were excluded from the calculation of “earnings per common share – assuming dilution” as the effect of including such securities would have been antidilutive. Stock options were excluded from weighted-average common shares outstanding – assuming dilution because the exercise price of the stock option was greater than the average market price of our common shares during each reporting period.
		Three Months Ended					Nine Months Ended
		September 30,					September 30,
		2013		2012			2013		2012
	Stock options	3		5			3		6

Segment_Information_Tables

Segment Information (Tables)	9 Months Ended
	Sep. 30, 2013
Segment Reporting [Abstract]	'
Segment information for our reportable segments	'
	The following table reflects activity related to our reportable segments (in millions):
			Refining			Retail		Ethanol			Corporate			Total
	Three months ended September 30, 2013:
	Operating revenues from external		$	34,747		$	—	$	1,390		$	—		$	36,137
	customers
	Intersegment revenues		—			—		16			—			16
	Operating income (loss)		600			—		113			(181		)	532
	Three months ended September 30, 2012:
	Operating revenues from external		30,543			3,092		1,091			—			34,726
	customers
	Intersegment revenues		2,348			—		15			—			2,363
	Operating income (loss)		1,528			41		(73		)	(187		)	1,309
	Nine months ended September 30, 2013:
	Operating revenues from external		95,864			3,896		3,885			—			103,645
	customers
	Intersegment revenues		2,876			—		86			—			2,962
	Operating income (loss)		2,733			81		222			(635		)	2,401
	Nine months ended September 30, 2012:
	Operating revenues from external		92,181			9,089		3,285			—			104,555
	customers
	Intersegment revenues		6,806			—		75			—			6,881
	Operating income (loss)		2,773			253		(59		)	(541		)	2,426
	Total assets by reportable segment were as follows (in millions):
		September 30,			December 31,
		2013			2012
	Refining	$	43,035		$	39,490
	Retail	—			2,043
	Ethanol	879			929
	Corporate	2,379			2,015
	Total assets	$	46,293		$	44,477

Supplemental_Cash_Flow_Informa1

Supplemental Cash Flow Information (Tables)	9 Months Ended
	Sep. 30, 2013
Supplemental Cash Flow Information [Abstract]	'
Changes in current assets and current liabilities	'
	In order to determine net cash provided by operating activities, net income is adjusted by, among other things, changes in current assets and current liabilities as follows (in millions):
		Nine Months Ended
		September 30,
		2013			2012
	Decrease (increase) in current assets:
	Receivables, net	$	(1,135	)	$	1,133
	Inventories	(1,335		)	(116		)
	Income taxes receivable	(122		)	172
	Prepaid expenses and other	8			(25		)
	Increase (decrease) in current liabilities:
	Accounts payable	2,031			(150		)
	Accrued expenses	51			10
	Taxes other than income taxes	276			55
	Income taxes payable	(5		)	112
	Changes in current assets and current liabilities	$	(231	)	$	1,191
Cash flows related to interest and income taxes	'
	Cash flows related to interest and income taxes were as follows (in millions):
		Nine Months Ended
		September 30,
		2013			2012
	Interest paid in excess of amount capitalized	$	237		$	206
	Income taxes paid, net	347			238

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2013
Fair Value Disclosures [Abstract]	'
Fair value of assets and liabilities measured on recurring basis	'
	The tables below present information (in millions) about our assets and liabilities recognized at their fair values in our balance sheets categorized according to the fair value hierarchy of the inputs utilized by us to determine the fair values as of September 30, 2013 and December 31, 2012.
	We have elected to offset the fair value amounts recognized for multiple similar derivative contracts executed with the same counterparty, including any related cash collateral assets or obligations as shown below; however, fair value amounts by hierarchy level are presented on a gross basis in the tables below. We have no derivative contracts that are subject to master netting arrangements that are reflected gross on the balance sheet.
		30-Sep-13
								Total		Effect of			Effect of			Net		Cash
								Gross		Counter-			Cash			Carrying		Collateral
								Fair		party			Collateral			Value on		Paid or
		Fair Value Hierarchy						Value		Netting			Netting			Balance		Received
		Level 1		Level 2		Level 3										Sheet		Not Offset
	Assets:
	Commodity derivative	$	1,345	$	26	$	—	$	1,371	$	(1,331	)	$	(5	)	$	35	$	—
	contracts
	Investments of certain	92		—		11		103		N/A			N/A			103		N/A
	benefit plans
	Total	$	1,437	$	26	$	11	$	1,474	$	(1,331	)	$	(5	)	$	138
	Liabilities:
	Commodity derivative	$	1,314	$	37	$	—	$	1,351	$	(1,331	)	$	(12	)	$	8	$	(79	)
	contracts
	Physical purchase	—		17		—		17		N/A			N/A			17		N/A
	contracts
	Foreign currency contracts	5		—		—		5		N/A			N/A			5		N/A
	Total	$	1,319	$	54	$	—	$	1,373	$	(1,331	)	$	(12	)	$	30
		31-Dec-12
								Total		Effect of			Effect of			Net		Cash
								Gross		Counter-			Cash			Carrying		Collateral
								Fair		party			Collateral			Value on		Paid or
		Fair Value Hierarchy						Value		Netting			Netting			Balance		Received
		Level 1		Level 2		Level 3										Sheet		Not Offset
	Assets:
	Commodity derivative	$	1,143	$	60	$	—	$	1,203	$	(1,189	)	$	—		$	14	$	—
	contracts
	Physical purchase contracts	—		11		—		11		N/A			N/A			11		N/A
	Foreign currency	1		—		—		1		N/A			N/A			1		N/A
	contracts
	Investments of certain benefit plans	87		—		11		98		N/A			N/A			98		N/A
	Total	$	1,231	$	71	$	11	$	1,313	$	(1,189	)	$	—		$	124
	Liabilities:
	Commodity derivative	$	1,138	$	70	$	—	$	1,208	$	(1,189	)	$	(13	)	$	6	$	(114	)
	contracts
	Biofuels blending obligation	—		10		—		10		N/A			N/A			10		N/A
	Foreign currency	1		—		—		1		N/A			N/A			1		N/A
	contracts
	Total	$	1,139	$	80	$	—	$	1,219	$	(1,189	)	$	(13	)	$	17
Fair value of assets measured on a nonrecurring basis	'
	The table below presents the fair value of certain assets that were measured at fair value on a nonrecurring basis as of December 31, 2012 (in millions).
								Total
								Fair Value
								as of
		Fair Value Hierarchy						December 31,
		Level 1		Level 2		Level 3		2012
	Cancelled capital project	$	—	$	—	$	2	$	2
	Property, plant and equipment of	—		—		8		8
	convenience stores
Carrying amounts and estimated fair value of financial instruments	'
	Financial instruments that we recognize in our balance sheets at their carrying amounts are shown in the table below (in millions):
		September 30, 2013				December 31, 2012
		Carrying		Fair		Carrying		Fair
		Amount		Value		Amount		Value
	Financial assets:
	Cash and temporary cash investments	$	1,908	$	1,908	$	1,723	$	1,723
	Equity investment in CST	119		449		—		—
	Financial liabilities:
	Debt (excluding capital leases)	6,524		7,545		7,000		8,621

Price_Risk_Management_Activiti1

Price Risk Management Activities (Tables)	9 Months Ended
	Sep. 30, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'
Volume of outstanding contracts in fair value hedges	'
	As of September 30, 2013, we had the following outstanding commodity derivative instruments that were entered into to hedge crude oil and refined product inventories and commodity derivative instruments related to the physical purchase of crude oil and refined products at a fixed price. The information presents the notional volume of outstanding contracts by type of instrument and year of maturity (volumes in thousands of barrels).
			Notional
			Contract
			Volumes by
			Year of
			Maturity
	Derivative Instrument		2013
	Crude oil and refined products:
	Futures – long		11,986
	Futures – short		15,788
	Physical contracts – long		3,802
Volume of outstanding contracts in cash flow hedges	'
	As of September 30, 2013, we had the following outstanding commodity derivative instruments that were entered into to hedge forecasted purchases or sales of crude oil and refined products. The information presents the notional volume of outstanding contracts by type of instrument and year of maturity (volumes in thousands of barrels).
			Notional
			Contract
			Volumes by
			Year of
			Maturity
	Derivative Instrument		2013
	Crude oil and refined products:
	Futures – long		5,876
	Futures – short		2,759
	Physical contracts – short		3,117
Volume of outstanding contracts in economic hedges	'
	As of September 30, 2013, we had the following outstanding commodity derivative instruments that were used as economic hedges and commodity derivative instruments related to the physical purchase of corn at a fixed price. The information presents the notional volume of outstanding contracts by type of instrument and year of maturity (volumes in thousands of barrels, except those identified as natural gas contracts that are presented in billions of British thermal units, corn contracts that are presented in thousands of bushels, and soybean oil contracts that are presented in thousands of pounds).
			Notional Contract Volumes by
			Year of Maturity
	Derivative Instrument		2013			2014			2015
	Crude oil and refined products:
	Swaps – long		2,867			45			—
	Swaps – short		1,797			90			—
	Futures – long		31,357			75			—
	Futures – short		42,753			—			—
	Natural gas:
	Options – long		5,250			—			—
	Corn:
	Futures – long		19,695			5			—
	Futures – short		21,410			1,500			15
	Physical contracts – long		7,682			1,543			—
	Soybean oil:
	Futures – short		26,520			—			—
Volume of outstanding contracts in trading activities	'
	As of September 30, 2013, we had the following outstanding commodity and other derivative instruments that were entered into for trading purposes. The information presents the notional volume of outstanding contracts by type of instrument and year of maturity (volumes represent thousands of barrels, except those identified as natural gas contracts that are presented in billions of British thermal units and corn contracts that are presented in thousands of bushels).
			Notional Contract Volumes by
			Year of Maturity
	Derivative Instrument		2013			2014
	Crude oil and refined products:
	Swaps – long		11,484			21,135
	Swaps – short		11,484			21,135
	Futures – long		121,803			49,298
	Futures – short		122,138			49,223
	Options – long		20,950			10,000
	Options – short		20,250			10,000
	Natural gas:
	Futures – long		1,150			—
	Futures – short		550			—
	Options – long		3,000			—
	Corn:
	Futures – long		3,200			—
	Futures – short		2,900			—
Fair value of derivative instruments	'
	The following tables provide information about the fair values of our derivative instruments as of September 30, 2013 and December 31, 2012 (in millions) and the line items in the balance sheets in which the fair values are reflected. See Note 12 for additional information related to the fair values of our derivative instruments.
	As indicated in Note 12, we net fair value amounts recognized for multiple similar derivative contracts executed with the same counterparty under master netting arrangements, including cash collateral assets and obligations. The tables below, however, are presented on a gross asset and gross liability basis, which results in the reflection of certain assets in liability accounts and certain liabilities in asset accounts.
		Balance Sheet		September 30, 2013
		Location		Asset				Liability
				Derivatives				Derivatives
	Derivatives designated as
	hedging instruments
	Commodity contracts:
	Futures	Receivables, net		$	45			$	45
	Derivatives not designated as
	hedging instruments
	Commodity contracts:
	Futures	Receivables, net		$	1,300			$	1,267
	Swaps	Receivables, net		18				27
	Swaps	Prepaid expenses and other		5				—
	Swaps	Accrued expenses		1				9
	Options	Receivables, net		2				3
	Physical purchase contracts	Inventories		—				17
	Foreign currency contracts	Accrued expenses		—				5
	Total			$	1,326			$	1,328
	Total derivatives			$	1,371			$	1,373
		Balance Sheet		December 31, 2012
		Location		Asset				Liability
				Derivatives				Derivatives
	Derivatives designated as
	hedging instruments
	Commodity contracts:
	Futures	Receivables, net		$	77			$	64
	Swaps	Receivables, net		15				13
	Swaps	Prepaid expenses and other		2				2
	Total			$	94			$	79
	Derivatives not designated as
	hedging instruments
	Commodity contracts:
	Futures	Receivables, net		$	1,066			$	1,073
	Swaps	Receivables, net		9				6
	Swaps	Accrued expenses		32				46
	Options	Receivables, net		1				4
	Options	Accrued expenses		1				—
	Physical purchase contracts	Inventories		11				—
	Foreign currency contracts	Receivables, net		1				—
	Foreign currency contracts	Accrued expenses		—				1
	Total			$	1,121			$	1,130
	Total derivatives			$	1,215			$	1,209
Effect of derivative instruments on income and OCI	'
	Derivatives in Cash Flow		Location of Gain (Loss)		Three Months Ended							Nine Months Ended
	Hedging Relationships		Recognized in Income		September 30,							September 30,
			on Derivatives		2013				2012			2013			2012
	Commodity contracts:
	Gain (loss) recognized in				$	3			$	27		$	(6	)	$	43
	OCI on derivatives
	(effective portion)
	Gain reclassified from		Cost of sales		6				45			1			81
	accumulated OCI into
	income (effective
	portion)
	Gain (loss) recognized in		Cost of sales		16				(3		)	13			23
	income on derivatives
	(ineffective portion)
	Trading Derivatives		Location of Gain (Loss)		Three Months Ended							Nine Months Ended
			Recognized in		September 30,							September 30,
			Income on Derivatives		2013				2012			2013			2012
	Commodity contracts		Cost of sales		$	11			$	(13	)	$	16		$	(9	)
	RINs fixed-price contracts		Cost of sales		—				—			(20		)	—
	Total				$	11			$	(13	)	$	(4	)	$	(9	)
	The following tables provide information about the gain or loss recognized in income and other comprehensive income on our derivative instruments and the line items in the financial statements in which such gains and losses are reflected (in millions).
	Derivatives in Fair Value		Location of Gain (Loss)		Three Months Ended							Nine Months Ended
	Hedging Relationships		Recognized in Income		September 30,							September 30,
			on Derivatives		2013				2012			2013			2012
	Commodity contracts:
	Loss recognized in		Cost of sales		$	(17	)		$	(127	)	$	(38	)	$	(307	)
	income on derivatives
	Gain recognized in		Cost of sales		19				101			41			238
	income on hedged item
	Gain (loss) recognized in		Cost of sales		2				(26		)	3			(69		)
	income on derivatives
	(ineffective portion)
	Derivatives Designated as		Location of Gain (Loss)		Three Months Ended							Nine Months Ended
	Economic Hedges		Recognized in		September 30,							September 30,
	and Other		Income on Derivatives
	Derivative Instruments				2013				2012			2013			2012
	Commodity contracts		Cost of sales		$	(76	)		$	(333	)	$	205		$	90
	Foreign currency contracts		Cost of sales		(22		)		(21		)	14			(43		)
	Total				$	(98	)		$	(354	)	$	219		$	47

Basis_of_Presentation_and_Summ2

Basis of Presentation and Summary of Significant Accounting Policies (Details) (USD $)	9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Basis of Presentation and Summary of Significant Accounting Policies (Textual)	'	'
Proceeds from collection of notes receivable	$0	$160
Scenario, Previously Reported [Member] | Paulsboro Refinery [Member]	'	'
Basis of Presentation and Summary of Significant Accounting Policies (Textual)	'	'
Proceeds from collection of notes receivable	'	$160

Separation_of_Retail_Business_1

Separation of Retail Business (Details) (USD $)	9 Months Ended				0 Months Ended	3 Months Ended	0 Months Ended	1 Months Ended	0 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Dec. 31, 2011	1-May-13	Jun. 30, 2013	1-May-13	Oct. 24, 2013	Apr. 16, 2013	1-May-13	1-May-13
					Spinoff [Member]	Spinoff [Member]	Spinoff [Member]	Spinoff [Member]	Spinoff [Member]	Spinoff [Member]	Spinoff [Member]
							Notes Payable to Banks [Member]	Notes Payable to Banks [Member]	Sourced From Parent's Short-Term Borrowings [Member]	Sourced From Entity Spunoff [Member]	Cash Proceeds Net of Tax Liability [Member]
								Subsequent Event [Member]	Notes Payable to Banks [Member]
Assets	'	'	'	'	'	'	'	'	'	'	'
Cash and temporary cash investments	$1,908,000,000	$2,549,000,000	$1,723,000,000	$1,024,000,000	$315,000,000	'	'	'	'	'	'
Credit card receivables from Valero	'	'	'	'	44,000,000	'	'	'	'	'	'
Other receivables, net	'	'	'	'	109,000,000	'	'	'	'	'	'
Inventories	7,063,000,000	'	5,973,000,000	'	170,000,000	'	'	'	'	'	'
Deferred income taxes	257,000,000	'	274,000,000	'	14,000,000	'	'	'	'	'	'
Prepaid expenses and other	131,000,000	'	154,000,000	'	13,000,000	'	'	'	'	'	'
Total current assets	18,593,000,000	'	16,460,000,000	'	665,000,000	'	'	'	'	'	'
Property, plant and equipment, at cost	33,652,000,000	'	34,132,000,000	'	1,891,000,000	'	'	'	'	'	'
Accumulated depreciation	-8,010,000,000	'	-7,832,000,000	'	-611,000,000	'	'	'	'	'	'
Property, plant and equipment, net	25,642,000,000	'	26,300,000,000	'	1,280,000,000	'	'	'	'	'	'
Intangible assets, net	160,000,000	'	213,000,000	'	38,000,000	'	'	'	'	'	'
Deferred charges and other assets, net	1,898,000,000	'	1,504,000,000	'	191,000,000	'	'	'	'	'	'
Total assets	46,293,000,000	'	44,477,000,000	'	2,174,000,000	'	'	'	'	'	'
Liabilities	'	'	'	'	'	'	'	'	'	'	'
Current portion of capital lease obligations	303,000,000	'	586,000,000	'	2,000,000	'	'	'	'	'	'
Trade payable to Valero	'	'	'	'	242,000,000	'	'	'	'	'	'
Other accounts payable	'	'	'	'	96,000,000	'	'	'	'	'	'
Accrued expenses	598,000,000	'	590,000,000	'	31,000,000	'	'	'	'	'	'
Taxes other than income taxes	1,287,000,000	'	1,026,000,000	'	20,000,000	'	'	'	'	'	'
Total current liabilities	13,668,000,000	'	11,929,000,000	'	391,000,000	'	'	'	'	'	'
Debt and capital lease obligations, less current portion	6,261,000,000	'	6,463,000,000	'	1,053,000,000	'	'	'	'	'	'
Deferred income taxes	6,312,000,000	'	5,860,000,000	'	83,000,000	'	'	'	'	'	'
Other long-term liabilities	1,665,000,000	'	2,130,000,000	'	112,000,000	'	'	'	'	'	'
Total liabilities	'	'	'	'	1,639,000,000	'	'	'	'	'	'
Separation of Retail Business (Textual)	'	'	'	'	'	'	'	'	'	'	'
Spinoff transaction, ownership percentage by Valero stockholders	'	'	'	'	80.00%	'	'	'	'	'	'
Cash distributed to Valero by CST Brands, Inc.	500,000,000	0	'	'	1,050,000,000	'	'	'	'	500,000,000	546,000,000
Proceeds from short-term debt	550,000,000	0	'	'	'	'	'	525,000,000	550,000,000	'	'
Senior unsecured bonds of CST issued to us	'	'	'	'	550,000,000	'	'	'	'	'	'
CST bonds exchanged in settlement of short-term borrowings	'	'	'	'	'	'	550,000,000	'	'	'	'
Cash held and retained by CST upon spin	315,000,000	0	'	'	315,000,000	'	'	'	'	'	'
Tax liability incurred related to business separation	'	'	'	'	189,000,000	'	'	'	'	'	'
Cost of separation in general and administrative expenses	'	'	'	'	'	$30,000,000	'	'	'	'	'
Ownership percentage retained	'	'	'	'	20.00%	'	'	'	'	'	'
Expected investment holding period	'	'	'	'	'18 months	'	'	'	'	'	'

Impairments_Details

Impairments (Details) (USD $)

3 Months Ended

9 Months Ended

1 Months Ended

3 Months Ended

9 Months Ended

1 Months Ended

9 Months Ended

1 Months Ended

9 Months Ended

In Millions, unless otherwise specified

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2012

Mar. 31, 2012

Sep. 30, 2012

Sep. 30, 2012

Mar. 28, 2012

Sep. 30, 2012

Sep. 30, 2012

Mar. 31, 2012

Sep. 30, 2012

Sep. 30, 2012

Sep. 30, 2012

Aruba Refinery [Member]

Aruba Refinery [Member]

Aruba Refinery [Member]

Aruba Refinery [Member]

Aruba Refinery [Member]

Refining Assets [Member]

Inventory Related Assets [Member]

Construction in Progress [Member]

Construction in Progress [Member]

Retail [Member]

Retail [Member]

Impairments (Textual)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Non-binding purchase offer

'

'

'

'

'

'

'

'

$350

'

'

'

'

'

'

Asset impairment losses

0

345

0

956

333

595

333

928

'

308

25

16

16

12

12

Long-lived assets, fair value

'

'

'

'

'

'

'

'

'

'

'

'

'

$5

$5

Inventories_Details

Inventories (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012
Schedule of Inventories	'	'
Refinery feedstocks	$3,109,000,000	$2,458,000,000
Refined products and blendstocks	3,582,000,000	2,995,000,000
Ethanol feedstocks and products	148,000,000	191,000,000
Convenience store merchandise	0	112,000,000
Materials and supplies	224,000,000	217,000,000
Inventories	7,063,000,000	5,973,000,000
Inventories (Textual)	'	'
Excess of market value over carrying amount of LIFO inventories	$7,100,000,000	$6,700,000,000

Debt_Bank_Debt_and_Credit_Faci

Debt, Bank Debt and Credit Facilities (Details)

9 Months Ended

0 Months Ended

1 Months Ended

0 Months Ended

9 Months Ended

9 Months Ended

9 Months Ended

9 Months Ended

Sep. 30, 2013

Sep. 30, 2012

1-May-13

Mar. 20, 2013

1-May-13

Oct. 24, 2013

Apr. 16, 2013

Mar. 20, 2013

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Sep. 30, 2012

Dec. 31, 2012

Sep. 30, 2013

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Sep. 30, 2012

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Mar. 20, 2013

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Sep. 30, 2012

USD ($)

USD ($)

Spinoff [Member]

Spinoff [Member]

Spinoff [Member]

Spinoff [Member]

Spinoff [Member]

Revolving Credit Facility [Member]

Letter of Credit [Member]

Letter of Credit [Member]

U S Revolver [Member]

U S Revolver [Member]

U S Revolver [Member]

U S Revolver [Member]

U S Revolver Letter of Credit [Member]

U S Revolver Letter of Credit [Member]

Canadian Revolver [Member]

Canadian Revolver [Member]

Canadian Revolver [Member]

Canadian Revolver Letter of Credit [Member]

Canadian Revolver Letter of Credit [Member]

Line of Credit [Member]

Other Letter of Credit [Member]

Other Letter of Credit [Member]

A/R Sales Facility [Member]

A/R Sales Facility [Member]

USD ($)

USD ($)

Notes Payable to Banks [Member]

Notes Payable to Banks [Member]

Sourced From Parent's Short-Term Borrowings [Member]

Spinoff [Member]

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

Maximum [Member]

USD ($)

USD ($)

CAD

CAD

CAD

CAD

CAD

Spinoff [Member]

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

Subsequent Event [Member]

Notes Payable to Banks [Member]

USD ($)

USD ($)

USD ($)

USD ($)

Line of Credit Facility

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Line of credit facility, maximum borrowing capacity

'

'

'

$800,000,000

'

'

'

$300,000,000

$550,000,000

'

$3,000,000,000

'

'

'

'

'

50,000,000

'

'

'

'

$500,000,000

'

'

$1,500,000,000

'

Line of credit facility, expiration date (month, year)

'

'

'

'

'

'

'

'

'June 2014

'

'December 2016

'

'

'

'

'

'November 2013

'

'

'

'

'

'

'

'

'

Amount outstanding

'

'

'

'

'

'

'

'

292,000,000

418,000,000

0

'

0

'

59,000,000

59,000,000

0

'

0

10,000,000

10,000,000

'

257,000,000

275,000,000

'

'

Accounts Receivable Sales Facility

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Balance as of beginning of period

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

100,000,000

250,000,000

Proceeds from the sale of receivables

0

1,500,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0

1,500,000,000

Repayments

0

-1,650,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0

-1,650,000,000

Balance as of end of period

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

100,000,000

100,000,000

Credit Facilities (Textual)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt to capitalization ratios as per terms of revolver

'

'

'

'

'

'

'

'

'

'

0.2

'

0.23

0.6

'

'

'

'

'

'

'

'

'

'

'

'

Borrowings from long-term lines of credit

0

1,100,000,000

'

'

'

'

'

'

'

'

0

1,100,000,000

'

'

'

'

0

0

'

'

'

'

'

'

'

'

Repayments of long-term lines of credit

0

1,100,000,000

'

'

'

'

'

'

'

'

0

1,100,000,000

'

'

'

'

0

0

'

'

'

'

'

'

'

'

Proceeds from short-term debt

550,000,000

0

'

'

'

525,000,000

550,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Senior unsecured bonds of CST issued to us

'

'

550,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

CST bonds exchanged in settlement of short-term borrowings

'

'

'

'

$550,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Ownership percentage retained

'

'

20.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Accounts Receivable Sales Facility (Textual)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Maturity date of accounts receivable sales facility

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'July 2014

'

Debt_NonBank_Debt_and_Capitali

Debt, Non-Bank Debt and Capitalized Interest (Details) (USD $)

3 Months Ended

9 Months Ended

1 Months Ended

1 Months Ended

0 Months Ended

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Jun. 30, 2013

Jan. 31, 2013

Jun. 30, 2012

Apr. 30, 2012

Mar. 31, 2012

Apr. 30, 2012

Mar. 31, 2012

Mar. 31, 2012

Mar. 31, 2012

Mar. 31, 2012

3-May-12

Notes Due In 2013 [Member]

Senior Notes Due In 2013 [Member]

Gulf Opportunity Zone Revenue Bonds Series 2010 [Member]

Tax Exempt Revenue Refunding Bonds Series 1997A [Member]

Tax Exempt Revenue Refunding Bonds Series 1997A [Member]

Notes Due In 2012 [Member]

Tax Exempt Waste Disposal Revenue Bonds Series 1997 [Member]

Tax Exempt Waste Disposal Revenue Bonds Series 1998 [Member]

Tax Exempt Waste Disposal Revenue Bonds Series 1999 [Member]

Tax Exempt Waste Disposal Revenue Bonds Series 2001 [Member]

Industrial Revenue Bonds Tax Exempt Refunding Bonds [Member]

Non-Bank Debt (Textual)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt repayments

'

'

$480,000,000

$862,000,000

$300,000,000

$180,000,000

'

$4,000,000

'

$750,000,000

'

'

'

'

$108,000,000

Interest rate of notes in percentage

'

'

'

'

4.75%

6.70%

4.00%

5.45%

5.45%

6.88%

5.60%

5.60%

5.70%

6.65%

'

Proceeds from advances for construction

'

'

'

'

'

'

300,000,000

'

'

'

'

'

'

'

'

Debt instrument, maturity date (month, day, year)

'

'

'

'

'

'

1-Dec-40

'

'

'

'

'

'

'

'

Debt instrument, mandatory tender date

'

'

'

'

'

'

1-Jun-22

'

'

'

'

'

'

'

'

Redemption value in percentage

'

'

'

'

'

'

'

'

'

'

'

'

'

'

100.00%

Capitalized Interest (Textual)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Interest costs incurred, capitalized

$16,000,000

$59,000,000

$101,000,000

$164,000,000

'

'

'

'

'

'

'

'

'

'

'

Commitments_and_Contingencies_

Commitments and Contingencies (Details) (USD $)	Sep. 30, 2013	Sep. 30, 2012	Mar. 31, 2013	Dec. 31, 2012
In Millions, unless otherwise specified		Aruba Refinery [Member]	Aruba Refinery [Member]	Aruba Refinery [Member]
		employees
Commitments and Contingencies (Textual)	'	'	'	'
Minimum range of possible loss contingency	$0	'	'	'
Maximum range of possible loss contingency	200	'	'	'
Number of employees notified of termination	'	495	'	'
Termination date	'	15-Nov-12	'	'
Severance liability	'	41	'	'
Severance payments	'	'	($10)	($31)

Equity_Details

Equity (Details) (USD $)	3 Months Ended		9 Months Ended
In Millions, except Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Reconciliation of the Beginning and Ending Balances of the Carrying Amounts of Equity	'	'	'	'
Balance as of beginning of period	'	'	$18,095	$16,445
Net income (loss)	324	673	1,441	1,071
Dividends	'	'	-342	-263
Stock-based compensation expense	'	'	31	29
Tax deduction in excess of stock-based compensation expense	'	'	31	16
Transactions in connection with stock-based compensation plans:	'	'	'	'
Stock issuances	'	'	47	36
Separation of retail business	'	'	-479	0
Contributions from noncontrolling interests	'	'	45	34
Other comprehensive income	182	133	134	156
Balance as of end of period	18,387	17,386	18,387	17,386
Share Activity	'	'	'	'
Treasury stock, shares, beginning balance	'	'	-121,406,520	'
Treasury stock, shares, ending balance	-131,876,124	'	-131,876,124	'
Shares Purchased Related To Stock-Based Compensation Plans [Member]	'	'	'	'
Transactions in connection with stock-based compensation plans:	'	'	'	'
Stock repurchases	'	'	-220	-138
Shares Purchased Under Programs [Member]	'	'	'	'
Transactions in connection with stock-based compensation plans:	'	'	'	'
Stock repurchases	'	'	-396	0
Parent [Member]	'	'	'	'
Reconciliation of the Beginning and Ending Balances of the Carrying Amounts of Equity	'	'	'	'
Balance as of beginning of period	'	'	18,032	16,423
Net income (loss)	'	'	1,432	1,073
Dividends	'	'	-342	-263
Stock-based compensation expense	'	'	31	29
Tax deduction in excess of stock-based compensation expense	'	'	31	16
Transactions in connection with stock-based compensation plans:	'	'	'	'
Stock issuances	'	'	47	36
Separation of retail business	'	'	-479	0
Contributions from noncontrolling interests	'	'	0	0
Other comprehensive income	'	'	134	156
Balance as of end of period	18,270	17,332	18,270	17,332
Parent [Member] | Shares Purchased Related To Stock-Based Compensation Plans [Member]	'	'	'	'
Transactions in connection with stock-based compensation plans:	'	'	'	'
Stock repurchases	'	'	-220	-138
Parent [Member] | Shares Purchased Under Programs [Member]	'	'	'	'
Transactions in connection with stock-based compensation plans:	'	'	'	'
Stock repurchases	'	'	-396	0
Common Stock [Member]	'	'	'	'
Share Activity	'	'	'	'
Common stock, shares, beginning balance	'	'	673,000,000	673,000,000
Stock issuances, stock-based compensation	'	'	0	0
Common stock, shares, ending balance	673,000,000	673,000,000	673,000,000	673,000,000
Treasury Stock [Member]	'	'	'	'
Share Activity	'	'	'	'
Treasury stock, shares, beginning balance	'	'	-121,000,000	-117,000,000
Stock issuances, stock-based compensation	'	'	3,000,000	3,000,000
Treasury stock, shares, ending balance	-132,000,000	-120,000,000	-132,000,000	-120,000,000
Treasury Stock [Member] | Shares Purchased Related To Stock-Based Compensation Plans [Member]	'	'	'	'
Share Activity	'	'	'	'
Stock repurchases	'	'	-5,000,000	-6,000,000
Treasury Stock [Member] | Shares Purchased Under Programs [Member]	'	'	'	'
Share Activity	'	'	'	'
Stock repurchases	'	'	-9,000,000	0
Noncontrolling Interest [Member]	'	'	'	'
Reconciliation of the Beginning and Ending Balances of the Carrying Amounts of Equity	'	'	'	'
Balance as of beginning of period	'	'	63	22
Net income (loss)	'	'	9	-2
Dividends	'	'	0	0
Stock-based compensation expense	'	'	0	0
Tax deduction in excess of stock-based compensation expense	'	'	0	0
Transactions in connection with stock-based compensation plans:	'	'	'	'
Stock issuances	'	'	0	0
Separation of retail business	'	'	0	0
Contributions from noncontrolling interests	'	'	45	34
Other comprehensive income	'	'	0	0
Balance as of end of period	117	54	117	54
Noncontrolling Interest [Member] | Shares Purchased Related To Stock-Based Compensation Plans [Member]	'	'	'	'
Transactions in connection with stock-based compensation plans:	'	'	'	'
Stock repurchases	'	'	0	0
Noncontrolling Interest [Member] | Shares Purchased Under Programs [Member]	'	'	'	'
Transactions in connection with stock-based compensation plans:	'	'	'	'
Stock repurchases	'	'	$0	$0

Equity_Changes_in_Accumulated_

Equity, Changes in Accumulated Other Comprehensive Income (Loss) (Details) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Changes in the Balances of Each Component of Accumulated Other Comprehensive Income (Loss)	'	'	'	'
Beginning balance, accumulated other comprehensive income (loss), net of tax	'	'	$108	'
Net other comprehensive income (loss)	182	133	134	156
Separation of retail business	'	'	-479	0
Ending balance, accumulated other comprehensive income (loss), net of tax	83	'	83	'
Accumulated Other Comprehensive Income (Loss) [Member]	'	'	'	'
Changes in the Balances of Each Component of Accumulated Other Comprehensive Income (Loss)	'	'	'	'
Beginning balance, accumulated other comprehensive income (loss), net of tax	'	'	108	'
Other comprehensive income (loss) before reclassifications	'	'	123	'
Amounts reclassified from accumulated other comprehensive income (loss)	'	'	11	'
Net other comprehensive income (loss)	'	'	134	'
Separation of retail business	'	'	-159	'
Ending balance, accumulated other comprehensive income (loss), net of tax	83	'	83	'
Foreign Currency Translation Adjustment [Member]	'	'	'	'
Changes in the Balances of Each Component of Accumulated Other Comprehensive Income (Loss)	'	'	'	'
Beginning balance, accumulated other comprehensive income (loss), net of tax	'	'	665	'
Other comprehensive income (loss) before reclassifications	'	'	-87	'
Amounts reclassified from accumulated other comprehensive income (loss)	'	'	0	'
Net other comprehensive income (loss)	'	'	-87	'
Separation of retail business	'	'	-159	'
Ending balance, accumulated other comprehensive income (loss), net of tax	419	'	419	'
Defined Benefit Plans Items [Member]	'	'	'	'
Changes in the Balances of Each Component of Accumulated Other Comprehensive Income (Loss)	'	'	'	'
Beginning balance, accumulated other comprehensive income (loss), net of tax	'	'	-558	'
Other comprehensive income (loss) before reclassifications	'	'	214	'
Amounts reclassified from accumulated other comprehensive income (loss)	'	'	12	'
Net other comprehensive income (loss)	'	'	226	'
Separation of retail business	'	'	0	'
Ending balance, accumulated other comprehensive income (loss), net of tax	-332	'	-332	'
Gains (Losses) on Cash Flow Hedges [Member]	'	'	'	'
Changes in the Balances of Each Component of Accumulated Other Comprehensive Income (Loss)	'	'	'	'
Beginning balance, accumulated other comprehensive income (loss), net of tax	'	'	1	'
Other comprehensive income (loss) before reclassifications	'	'	-4	'
Amounts reclassified from accumulated other comprehensive income (loss)	'	'	-1	'
Net other comprehensive income (loss)	'	'	-5	'
Separation of retail business	'	'	0	'
Ending balance, accumulated other comprehensive income (loss), net of tax	($4)	'	($4)	'

Equity_Reclassification_Out_of

Equity, Reclassification Out of Accumulated Other Comprehensive Income (Loss) (Details) (USD $)	3 Months Ended			9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013		Sep. 30, 2012	Sep. 30, 2013		Sep. 30, 2012
Reclassification Adjustment out of Accumulated Other Comprehensive Income (Loss)	'		'	'		'
Net actuarial loss	$14		$8	$43		$25
Prior service credit	-9		-5	-24		-15
Total before tax	447		1,237	2,180		2,182
Tax benefit (expense)	-123		-564	-739		-1,111
Net of tax	324		673	1,441		1,071
Reclassification out of Accumulated Other Comprehensive Income (Loss) [Member]	'		'	'		'
Reclassification Adjustment out of Accumulated Other Comprehensive Income (Loss)	'		'	'		'
Net of tax	1		'	-11		'
Defined Benefit Plans Items [Member] | Reclassification out of Accumulated Other Comprehensive Income (Loss) [Member]	'		'	'		'
Reclassification Adjustment out of Accumulated Other Comprehensive Income (Loss)	'		'	'		'
Net actuarial loss	-14	[1]	'	-43	[1]	'
Prior service credit	9	[1]	'	24	[1]	'
Total before tax	-5		'	-19		'
Tax benefit (expense)	2		'	7		'
Net of tax	-3		'	-12		'
Gains (Losses) on Cash Flow Hedges [Member] | Reclassification out of Accumulated Other Comprehensive Income (Loss) [Member]	'		'	'		'
Reclassification Adjustment out of Accumulated Other Comprehensive Income (Loss)	'		'	'		'
Total before tax	6		'	1		'
Tax benefit (expense)	-2		'	0		'
Net of tax	4		'	1		'
Gains (Losses) on Cash Flow Hedges [Member] | Commodity Contract [Member] | Reclassification out of Accumulated Other Comprehensive Income (Loss) [Member]	'		'	'		'
Reclassification Adjustment out of Accumulated Other Comprehensive Income (Loss)	'		'	'		'
Cost of sales	$6		'	$1		'
[1]	These accumulated other comprehensive income (loss) components are included in the computation of net periodic benefit cost, as further discussed in Note 8. Net periodic benefit cost is reflected in operating expenses and general and administrative expenses.

Employee_Benefit_Plans_Details

Employee Benefit Plans (Details) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Employee Benefit Plans (Textual)	'	'	'	'
Gain arising during the period related to plan amendments	$0	$0	$328	$0
Pension Plan, Defined Benefit [Member]	'	'	'	'
Components of net periodic benefit cost:	'	'	'	'
Service cost	34	35	105	105
Interest cost	21	23	65	69
Expected return on plan assets	-33	-31	-99	-93
Amortization of:	'	'	'	'
Net actuarial loss	14	8	43	25
Prior service cost (credit)	-5	1	-14	2
Net periodic benefit cost	31	36	100	108
Employee Benefit Plans (Textual)	'	'	'	'
Decrease in liability related to plan amendments	'	'	328	'
Gain arising during the period related to plan amendments	'	'	328	'
Decrease in expected employer contributions	'	'	100	'
Expected future employer contributions to defined benefit plans	'	'	45	'
Contributions to pension plans	'	'	23	137
Other Postretirement Benefit Plan, Defined Benefit [Member]	'	'	'	'
Components of net periodic benefit cost:	'	'	'	'
Service cost	3	3	9	9
Interest cost	4	5	13	16
Expected return on plan assets	0	0	0	0
Amortization of:	'	'	'	'
Net actuarial loss	0	0	0	0
Prior service cost (credit)	-4	-6	-10	-17
Net periodic benefit cost	3	2	12	8
Employee Benefit Plans (Textual)	'	'	'	'
Contributions to pension plans	'	'	$13	$14

Earnings_Per_Common_Share_Deta

Earnings Per Common Share (Details) (USD $)	3 Months Ended		9 Months Ended
In Millions, except Per Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Less dividends paid:	'	'	'	'
Weighted-average common shares outstanding (in millions)	540	549	544	550
Earnings per common share – assuming dilution:	'	'	'	'
Weighted-average common shares outstanding (in millions)	540	549	544	550
Common equivalent shares:	'	'	'	'
Weighted-average common shares outstanding – assuming dilution (in millions)	545	556	549	556
Common Stock [Member]	'	'	'	'
Earnings per common share:	'	'	'	'
Net income attributable to Valero stockholders	312	674	1,432	1,073
Less dividends paid:	'	'	'	'
Common stock	121	96	340	261
Nonvested restricted stock	1	1	2	2
Undistributed earnings	190	577	1,090	810
Weighted-average common shares outstanding (in millions)	540	549	544	550
Earnings per common share:	'	'	'	'
Distributed earnings (in usd per share)	0.23	0.18	0.63	0.48
Undistributed earnings (in usd per share)	0.35	1.04	1.99	1.46
Total earnings per common share (in usd per share)	0.58	1.22	2.62	1.94
Earnings per common share – assuming dilution:	'	'	'	'
Net income attributable to Valero stockholders	312	674	1,432	1,073
Weighted-average common shares outstanding (in millions)	540	549	544	550
Common equivalent shares:	'	'	'	'
Stock options (in shares)	3	4	3	4
Performance awards and nonvested restricted stock (in shares)	2	3	2	2
Weighted-average common shares outstanding – assuming dilution (in millions)	545	556	549	556
Earnings per common share – assuming dilution (in usd per share)	0.57	1.21	2.61	1.93
Restricted Stock [Member]	'	'	'	'
Less dividends paid:	'	'	'	'
Weighted-average common shares outstanding (in millions)	3	3	3	3
Earnings per common share:	'	'	'	'
Distributed earnings (in usd per share)	0.23	0.18	0.63	0.48
Undistributed earnings (in usd per share)	0.35	1.04	1.99	1.46
Total earnings per common share (in usd per share)	0.58	1.22	2.62	1.94
Earnings per common share – assuming dilution:	'	'	'	'
Weighted-average common shares outstanding (in millions)	3	3	3	3

Earnings_Per_Common_Share_Pote

Earnings Per Common Share, Potentially Dilutive Securities (Details) (Stock Options [Member])	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Stock Options [Member]	'	'	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Common Share	'	'	'	'
Amount of potentially dilutive securities excluded from computation of earnings per common share	3	5	3	6

Segment_Information_Details

Segment Information (Details) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Segment information for our reportable segments	'	'	'	'	'
Operating revenues	$36,137	$34,726	$103,645	$104,555	'
Operating income (loss)	532	1,309	2,401	2,426	'
Total assets by reportable segment	'	'	'	'	'
Reportable segment assets	46,293	'	46,293	'	44,477
Refining [Member]	'	'	'	'	'
Total assets by reportable segment	'	'	'	'	'
Reportable segment assets	43,035	'	43,035	'	39,490
Retail [Member]	'	'	'	'	'
Total assets by reportable segment	'	'	'	'	'
Reportable segment assets	0	'	0	'	2,043
Ethanol [Member]	'	'	'	'	'
Total assets by reportable segment	'	'	'	'	'
Reportable segment assets	879	'	879	'	929
Corporate and Other [Member]	'	'	'	'	'
Total assets by reportable segment	'	'	'	'	'
Reportable segment assets	2,379	'	2,379	'	2,015
Operating Segments [Member] | Refining [Member]	'	'	'	'	'
Segment information for our reportable segments	'	'	'	'	'
Operating revenues	34,747	30,543	95,864	92,181	'
Operating income (loss)	600	1,528	2,733	2,773	'
Operating Segments [Member] | Retail [Member]	'	'	'	'	'
Segment information for our reportable segments	'	'	'	'	'
Operating revenues	0	3,092	3,896	9,089	'
Operating income (loss)	0	41	81	253	'
Operating Segments [Member] | Ethanol [Member]	'	'	'	'	'
Segment information for our reportable segments	'	'	'	'	'
Operating revenues	1,390	1,091	3,885	3,285	'
Operating income (loss)	113	-73	222	-59	'
Corporate, Non-Segment [Member] | Corporate and Other [Member]	'	'	'	'	'
Segment information for our reportable segments	'	'	'	'	'
Operating revenues	0	0	0	0	'
Operating income (loss)	-181	-187	-635	-541	'
Intersegment Eliminations [Member]	'	'	'	'	'
Segment information for our reportable segments	'	'	'	'	'
Operating revenues	16	2,363	2,962	6,881	'
Intersegment Eliminations [Member] | Refining [Member]	'	'	'	'	'
Segment information for our reportable segments	'	'	'	'	'
Operating revenues	0	2,348	2,876	6,806	'
Intersegment Eliminations [Member] | Retail [Member]	'	'	'	'	'
Segment information for our reportable segments	'	'	'	'	'
Operating revenues	0	0	0	0	'
Intersegment Eliminations [Member] | Ethanol [Member]	'	'	'	'	'
Segment information for our reportable segments	'	'	'	'	'
Operating revenues	$16	$15	$86	$75	'

Supplemental_Cash_Flow_Informa2

Supplemental Cash Flow Information (Details) (USD $)	9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Decrease (increase) in current assets:	'	'
Receivables, net	($1,135)	$1,133
Inventories	-1,335	-116
Income taxes receivable	-122	172
Prepaid expenses and other	8	-25
Increase (decrease) in current liabilities:	'	'
Accounts payable	2,031	-150
Accrued expenses	51	10
Taxes other than income taxes	276	55
Income taxes payable	-5	112
Changes in current assets and current liabilities	-231	1,191
Cash Flows Related to Interest and Income Taxes	'	'
Interest paid in excess of amount capitalized	237	206
Income taxes paid, net	$347	$238

Fair_Value_Measurements_Recurr

Fair Value Measurements, Recurring (Details) (Fair Value, Measurements, Recurring [Member], USD $)	Sep. 30, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Assets:	'	'
Commodity derivative contracts	$1,371	$1,203
Foreign currency contracts	'	1
Investments of certain benefit plans	103	98
Total gross fair value, assets	1,474	1,313
Commodity derivative contracts, net assets	35	14
Net Carrying Value on Balance Sheet, Assets	138	124
Cash Collateral Received Not Offset	0	0
Liabilities:	'	'
Commodity derivative contracts	1,351	1,208
Biofuels blending obligation	'	10
Foreign currency contracts	5	1
Total gross fair value, liabilities	1,373	1,219
Commodity derivative contracts, net liabilities	8	6
Net Carrying Value on Balance Sheet, Liabilities	30	17
Cash Collateral Paid Not Offset	-79	-114
Physical Purchase Contracts [Member]	'	'
Assets:	'	'
Physical purchase contracts	'	11
Liabilities:	'	'
Physical purchase contracts	17	'
Fair Value, Inputs, Level 1 [Member]	'	'
Assets:	'	'
Commodity derivative contracts	1,345	1,143
Foreign currency contracts	'	1
Investments of certain benefit plans	92	87
Total gross fair value, assets	1,437	1,231
Liabilities:	'	'
Commodity derivative contracts	1,314	1,138
Biofuels blending obligation	'	0
Foreign currency contracts	5	1
Total gross fair value, liabilities	1,319	1,139
Fair Value, Inputs, Level 1 [Member] | Physical Purchase Contracts [Member]	'	'
Assets:	'	'
Physical purchase contracts	'	0
Liabilities:	'	'
Physical purchase contracts	0	'
Fair Value, Inputs, Level 2 [Member]	'	'
Assets:	'	'
Commodity derivative contracts	26	60
Foreign currency contracts	'	0
Investments of certain benefit plans	0	0
Total gross fair value, assets	26	71
Liabilities:	'	'
Commodity derivative contracts	37	70
Biofuels blending obligation	'	10
Foreign currency contracts	0	0
Total gross fair value, liabilities	54	80
Fair Value, Inputs, Level 2 [Member] | Physical Purchase Contracts [Member]	'	'
Assets:	'	'
Physical purchase contracts	'	11
Liabilities:	'	'
Physical purchase contracts	17	'
Fair Value, Inputs, Level 3 [Member]	'	'
Assets:	'	'
Commodity derivative contracts	0	0
Foreign currency contracts	'	0
Investments of certain benefit plans	11	11
Total gross fair value, assets	11	11
Liabilities:	'	'
Commodity derivative contracts	0	0
Biofuels blending obligation	'	0
Foreign currency contracts	0	0
Total gross fair value, liabilities	0	0
Fair Value, Inputs, Level 3 [Member] | Physical Purchase Contracts [Member]	'	'
Assets:	'	'
Physical purchase contracts	'	0
Liabilities:	'	'
Physical purchase contracts	0	'
Netting [Member]	'	'
Assets:	'	'
Effect of Counterparty Netting	-1,331	-1,189
Effect of Cash Collateral Netting	-5	0
Liabilities:	'	'
Effect of Counterparty Netting	-1,331	-1,189
Effect of Cash Collateral Netting	($12)	($13)

Fair_Value_Measurements_Level_

Fair Value Measurements, Level 3 Reconciliation (Details) (Fair Value, Measurements, Recurring [Member], USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Fair Value, Measurements, Recurring [Member]	'	'	'	'
Fair Value Measurements (Textual)	'	'	'	'
Activity related to fair value amounts categorized in Level 3	$0	$0	$0	$0

Fair_Value_Measurements_Nonrec

Fair Value Measurements, Nonrecurring (Details) (USD $)

3 Months Ended

9 Months Ended

1 Months Ended

3 Months Ended

9 Months Ended

1 Months Ended

9 Months Ended

1 Months Ended

9 Months Ended

In Millions, unless otherwise specified

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Dec. 31, 2012

Sep. 30, 2012

Mar. 31, 2012

Sep. 30, 2012

Sep. 30, 2012

Mar. 31, 2012

Sep. 30, 2012

Sep. 30, 2012

Sep. 30, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Dec. 31, 2012

Dec. 31, 2012

Dec. 31, 2012

Dec. 31, 2012

Dec. 31, 2012

Dec. 31, 2012

Mar. 31, 2012

Dec. 31, 2012

Dec. 31, 2012

Sep. 30, 2012

Aruba Refinery [Member]

Aruba Refinery [Member]

Aruba Refinery [Member]

Aruba Refinery [Member]

Construction in Progress [Member]

Construction in Progress [Member]

Retail [Member]

Retail [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Recurring [Member]

Fair Value, Measurements, Nonrecurring [Member]

Fair Value, Measurements, Nonrecurring [Member]

Fair Value, Measurements, Nonrecurring [Member]

Fair Value, Measurements, Nonrecurring [Member]

Fair Value, Measurements, Nonrecurring [Member]

Fair Value, Measurements, Nonrecurring [Member]

Fair Value, Measurements, Nonrecurring [Member]

Fair Value, Measurements, Nonrecurring [Member]

Fair Value, Measurements, Nonrecurring [Member]

Fair Value, Measurements, Nonrecurring [Member]

Fair Value, Measurements, Nonrecurring [Member]

Fair Value, Measurements, Nonrecurring [Member]

Construction in Progress [Member]

Retail [Member]

Fair Value, Inputs, Level 1 [Member]

Fair Value, Inputs, Level 1 [Member]

Fair Value, Inputs, Level 2 [Member]

Fair Value, Inputs, Level 2 [Member]

Fair Value, Inputs, Level 3 [Member]

Fair Value, Inputs, Level 3 [Member]

Fair Value, Inputs, Level 3 [Member]

Fair Value, Inputs, Level 3 [Member]

Construction in Progress [Member]

Retail [Member]

Construction in Progress [Member]

Retail [Member]

Aruba Refinery [Member]

Construction in Progress [Member]

Retail [Member]

Retail [Member]

Assets:

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Long-lived assets, fair value

'

'

'

'

'

'

'

'

'

'

'

$5

$5

'

'

'

'

$2

$8

$0

$0

$0

$0

$350

$2

$8

$5

Fair Value Measurements (Textual)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Assets measured at fair value, nonrecurring

'

'

'

'

'

'

'

'

'

'

'

'

'

138

124

0

'

'

'

'

'

'

'

'

'

'

'

Liabilities measured at fair value, nonrecurring

'

'

'

'

'

'

'

'

'

'

'

'

'

30

17

0

0

'

'

'

'

'

'

'

'

'

'

Asset impairment losses

0

345

0

956

'

333

595

333

928

16

16

12

12

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Long-lived assets, carrying value

$25,642

'

$25,642

'

$26,300

'

$945

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Fair_Value_Measurements_Other_

Fair Value Measurements, Other Financial Instruments (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Dec. 31, 2011
In Millions, unless otherwise specified
Financial assets:	'	'	'	'
Cash and temporary cash investments, at carrying amount	$1,908	$1,723	$2,549	$1,024
Equity investment in CST, at carrying amount	119	0	'	'
Financial liabilities:	'	'	'	'
Debt (excluding capital leases), at carrying amount	6,524	7,000	'	'
Fair Value, Inputs, Level 1 [Member]	'	'	'	'
Financial assets:	'	'	'	'
Cash and temporary cash investments, at fair value	1,908	1,723	'	'
Equity investment in CST, at fair value	449	0	'	'
Fair Value, Inputs, Level 2 [Member]	'	'	'	'
Financial liabilities:	'	'	'	'
Debt (excluding capital leases), at fair value	$7,545	$8,621	'	'

Price_Risk_Management_Activiti2

Price Risk Management Activities (Details) (USD $)

3 Months Ended

9 Months Ended

1 Months Ended

In Millions, unless otherwise specified

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Oct. 31, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Sep. 30, 2013

Biofuels Blending [Member]

Biofuels Blending [Member]

Biofuels Blending [Member]

Biofuels Blending [Member]

Foreign Currency Contract [Member]

Foreign Currency Contract [Member]

Fair Value Hedging [Member]

Fair Value Hedging [Member]

Fair Value Hedging [Member]

Cash Flow Hedging [Member]

Cash Flow Hedging [Member]

Cash Flow Hedging [Member]

Economic Hedging [Member]

Economic Hedging [Member]

Economic Hedging [Member]

Economic Hedging [Member]

Economic Hedging [Member]

Economic Hedging [Member]

Economic Hedging [Member]

Economic Hedging [Member]

Economic Hedging [Member]

Economic Hedging [Member]

Economic Hedging [Member]

Economic Hedging [Member]

Economic Hedging [Member]

Economic Hedging [Member]

Economic Hedging [Member]

Economic Hedging [Member]

Economic Hedging [Member]

Economic Hedging [Member]

Economic Hedging [Member]

Economic Hedging [Member]

Economic Hedging [Member]

Economic Hedging [Member]

Economic Hedging [Member]

Economic Hedging [Member]

Economic Hedging [Member]

Economic Hedging [Member]

Economic Hedging [Member]

Commodity [Member]

Commodity [Member]

Commodity [Member]

Commodity [Member]

Commodity [Member]

Commodity [Member]

Commodity [Member]

Commodity [Member]

Commodity [Member]

Commodity [Member]

Commodity [Member]

Commodity [Member]

Commodity [Member]

Commodity [Member]

Commodity [Member]

Commodity [Member]

Commodity [Member]

Commodity [Member]

Commodity [Member]

Commodity [Member]

Commodity [Member]

Commodity [Member]

Future [Member]

Future [Member]

Forward Contracts [Member]

Future [Member]

Future [Member]

Forward Contracts [Member]

Future [Member]

Future [Member]

Future [Member]

Future [Member]

Future [Member]

Future [Member]

Future [Member]

Future [Member]

Future [Member]

Future [Member]

Future [Member]

Future [Member]

Future [Member]

Future [Member]

Future [Member]

Forward Contracts [Member]

Forward Contracts [Member]

Forward Contracts [Member]

Swap [Member]

Swap [Member]

Swap [Member]

Swap [Member]

Swap [Member]

Swap [Member]

Options Held [Member]

Options Held [Member]

Options Held [Member]

Future [Member]

Future [Member]

Future [Member]

Future [Member]

Future [Member]

Future [Member]

Future [Member]

Future [Member]

Future [Member]

Future [Member]

Future [Member]

Future [Member]

Swap [Member]

Swap [Member]

Swap [Member]

Swap [Member]

Options Held [Member]

Options Held [Member]

Options Held [Member]

Options Held [Member]

Options Held [Member]

Options Held [Member]

Long (Purchases) [Member]

Short (Sales) [Member]

Long (Purchases) [Member]

Long (Purchases) [Member]

Short (Sales) [Member]

Short (Sales) [Member]

Long (Purchases) [Member]

Long (Purchases) [Member]

Long (Purchases) [Member]

Long (Purchases) [Member]

Long (Purchases) [Member]

Long (Purchases) [Member]

Short (Sales) [Member]

Short (Sales) [Member]

Short (Sales) [Member]

Short (Sales) [Member]

Short (Sales) [Member]

Short (Sales) [Member]

Short (Sales) [Member]

Short (Sales) [Member]

Short (Sales) [Member]

Long (Purchases) [Member]

Long (Purchases) [Member]

Long (Purchases) [Member]

Long (Purchases) [Member]

Long (Purchases) [Member]

Long (Purchases) [Member]

Short (Sales) [Member]

Short (Sales) [Member]

Short (Sales) [Member]

Long (Purchases) [Member]

Long (Purchases) [Member]

Long (Purchases) [Member]

Long (Purchases) [Member]

Long (Purchases) [Member]

Long (Purchases) [Member]

Long (Purchases) [Member]

Long (Purchases) [Member]

Long (Purchases) [Member]

Short (Sales) [Member]

Short (Sales) [Member]

Short (Sales) [Member]

Short (Sales) [Member]

Short (Sales) [Member]

Short (Sales) [Member]

Long (Purchases) [Member]

Long (Purchases) [Member]

Short (Sales) [Member]

Short (Sales) [Member]

Long (Purchases) [Member]

Long (Purchases) [Member]

Long (Purchases) [Member]

Long (Purchases) [Member]

Short (Sales) [Member]

Short (Sales) [Member]

Maturity Current Year [Member]

Maturity Current Year [Member]

Maturity Current Year [Member]

Maturity Current Year [Member]

Maturity Current Year [Member]

Maturity Current Year [Member]

Maturity Current Year [Member]

Maturity Current Year [Member]

Maturity Year Two [Member]

Maturity Year Two [Member]

Maturity Year Three [Member]

Maturity Year Three [Member]

Maturity Current Year [Member]

Maturity Current Year [Member]

Maturity Current Year [Member]

Maturity Year Two [Member]

Maturity Year Two [Member]

Maturity Year Two [Member]

Maturity Year Three [Member]

Maturity Year Three [Member]

Maturity Year Three [Member]

Maturity Current Year [Member]

Maturity Year Two [Member]

Maturity Year Three [Member]

Maturity Current Year [Member]

Maturity Year Two [Member]

Maturity Year Three [Member]

Maturity Current Year [Member]

Maturity Year Two [Member]

Maturity Year Three [Member]

Maturity Current Year [Member]

Maturity Year Two [Member]

Maturity Year Three [Member]

Maturity Current Year [Member]

Maturity Current Year [Member]

Maturity Current Year [Member]

Maturity Year Two [Member]

Maturity Year Two [Member]

Maturity Year Two [Member]

Maturity Current Year [Member]

Maturity Current Year [Member]

Maturity Current Year [Member]

Maturity Year Two [Member]

Maturity Year Two [Member]

Maturity Year Two [Member]

Maturity Current Year [Member]

Maturity Year Two [Member]

Maturity Current Year [Member]

Maturity Year Two [Member]

Maturity Current Year [Member]

Maturity Current Year [Member]

Maturity Year Two [Member]

Maturity Year Two [Member]

Maturity Current Year [Member]

Maturity Year Two [Member]

Crude Oil (in thousands of barrels) [Member]

Crude Oil (in thousands of barrels) [Member]

Crude Oil (in thousands of barrels) [Member]

Crude Oil (in thousands of barrels) [Member]

Crude Oil (in thousands of barrels) [Member]

Crude Oil (in thousands of barrels) [Member]

Crude Oil (in thousands of barrels) [Member]

Grain (in bushels) [Member]

Crude Oil (in thousands of barrels) [Member]

Grain (in bushels) [Member]

Crude Oil (in thousands of barrels) [Member]

Grain (in bushels) [Member]

Crude Oil (in thousands of barrels) [Member]

Grain (in bushels) [Member]

Soybean Oil (in thousands of pounds) [Member]

Crude Oil (in thousands of barrels) [Member]

Grain (in bushels) [Member]

Soybean Oil (in thousands of pounds) [Member]

Crude Oil (in thousands of barrels) [Member]

Grain (in bushels) [Member]

Soybean Oil (in thousands of pounds) [Member]

Grain (in bushels) [Member]

Grain (in bushels) [Member]

Grain (in bushels) [Member]

Crude Oil (in thousands of barrels) [Member]

Crude Oil (in thousands of barrels) [Member]

Crude Oil (in thousands of barrels) [Member]

Crude Oil (in thousands of barrels) [Member]

Crude Oil (in thousands of barrels) [Member]

Crude Oil (in thousands of barrels) [Member]

Natural Gas (in millions of BTUs) [Member]

Natural Gas (in millions of BTUs) [Member]

Natural Gas (in millions of BTUs) [Member]

Crude Oil (in thousands of barrels) [Member]

Natural Gas (in millions of BTUs) [Member]

Grain (in bushels) [Member]

Crude Oil (in thousands of barrels) [Member]

Natural Gas (in millions of BTUs) [Member]

Grain (in bushels) [Member]

Crude Oil (in thousands of barrels) [Member]

Natural Gas (in millions of BTUs) [Member]

Grain (in bushels) [Member]

Crude Oil (in thousands of barrels) [Member]

Natural Gas (in millions of BTUs) [Member]

Grain (in bushels) [Member]

Crude Oil (in thousands of barrels) [Member]

Crude Oil (in thousands of barrels) [Member]

Crude Oil (in thousands of barrels) [Member]

Crude Oil (in thousands of barrels) [Member]

Crude Oil (in thousands of barrels) [Member]

Natural Gas (in millions of BTUs) [Member]

Crude Oil (in thousands of barrels) [Member]

Natural Gas (in millions of BTUs) [Member]

Crude Oil (in thousands of barrels) [Member]

Crude Oil (in thousands of barrels) [Member]

MBbls

MBbls

MBbls

MBbls

MBbls

MBbls

MBbls

bu

MBbls

bu

MBbls

bu

MBbls

bu

lb

MBbls

bu

lb

MBbls

bu

lb

bu

bu

bu

MBbls

MBbls

MBbls

MBbls

MBbls

MBbls

MMBTU

MMBTU

MMBTU

MBbls

MMBTU

bu

MBbls

MMBTU

bu

MBbls

MMBTU

bu

MBbls

MMBTU

bu

MBbls

MBbls

MBbls

MBbls

MBbls

MMBTU

MBbls

MMBTU

MBbls

MBbls

Volume of Outstanding Contracts

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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'

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'

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'

'

'

'

'

'

'

'

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'

'

'

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'

'

'

'

'

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'

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'

'

'

'

'

'

'

'

'

'

'

'

'

Nonmonetary notional amount of price risk derivatives

'

'

'

'

'

'

11,986

15,788

3,802

5,876

2,759

3,117

31,357

19,695,000

75

5,000

0

0

42,753

21,410,000

26,520,000

0

1,500,000

0

0

15,000

0

7,682,000

1,543,000

0

2,867

45

0

1,797

90

0

5,250,000

0

0

121,803

1,150,000

3,200,000

49,298

0

0

122,138

550,000

2,900,000

49,223

0

0

11,484

21,135

11,484

21,135

20,950

3,000,000

10,000

0

20,250

10,000

Monetary notional amount of derivative liabilities

'

'

'

'

'

$845

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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'

Price Risk Management Activities (Textual)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Foreign currency commitments maturity date

'

'

'

'

31-Oct-13

'

'

'

'

'

'

'

'

'

'

'

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'

'

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Compliance program costs

$187

$72

$454

$198

'

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'

Price_Risk_Management_Activiti3

Price Risk Management Activities, Hedging Instruments by Consolidated Balance Sheet Location (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Millions, unless otherwise specified
Fair Values of Derivative Instruments	'	'
Total derivative assets, net	$1,371	$1,215
Total derivative liabilities, net	1,373	1,209
Designated as Hedging Instrument [Member]	'	'
Fair Values of Derivative Instruments	'	'
Derivative asset, fair value, gross asset	'	94
Derivative liability, fair value, gross liability	'	79
Designated as Hedging Instrument [Member] | Future [Member] | Commodity Contract [Member] | Trade Accounts Receivable [Member]	'	'
Fair Values of Derivative Instruments	'	'
Derivative asset, fair value, gross asset	45	77
Derivative asset, fair value, gross liability	45	64
Designated as Hedging Instrument [Member] | Swap [Member] | Commodity Contract [Member] | Trade Accounts Receivable [Member]	'	'
Fair Values of Derivative Instruments	'	'
Derivative asset, fair value, gross asset	'	15
Derivative asset, fair value, gross liability	'	13
Designated as Hedging Instrument [Member] | Swap [Member] | Commodity Contract [Member] | Prepaid Expenses and Other Current Assets [Member]	'	'
Fair Values of Derivative Instruments	'	'
Derivative asset, fair value, gross asset	'	2
Derivative asset, fair value, gross liability	'	2
Not Designated as Hedging Instrument [Member]	'	'
Fair Values of Derivative Instruments	'	'
Derivative asset, fair value, gross asset	1,326	1,121
Derivative liability, fair value, gross liability	1,328	1,130
Not Designated as Hedging Instrument [Member] | Future [Member] | Commodity Contract [Member] | Trade Accounts Receivable [Member]	'	'
Fair Values of Derivative Instruments	'	'
Derivative asset, fair value, gross asset	1,300	1,066
Derivative asset, fair value, gross liability	1,267	1,073
Not Designated as Hedging Instrument [Member] | Swap [Member] | Commodity Contract [Member] | Trade Accounts Receivable [Member]	'	'
Fair Values of Derivative Instruments	'	'
Derivative asset, fair value, gross asset	18	9
Derivative asset, fair value, gross liability	27	6
Not Designated as Hedging Instrument [Member] | Swap [Member] | Commodity Contract [Member] | Prepaid Expenses and Other Current Assets [Member]	'	'
Fair Values of Derivative Instruments	'	'
Derivative asset, fair value, gross asset	5	'
Derivative asset, fair value, gross liability	0	'
Not Designated as Hedging Instrument [Member] | Swap [Member] | Commodity Contract [Member] | Accrued Expenses [Member]	'	'
Fair Values of Derivative Instruments	'	'
Derivative liability, fair value, gross asset	1	32
Derivative liability, fair value, gross liability	9	46
Not Designated as Hedging Instrument [Member] | Options Held [Member] | Commodity Contract [Member] | Trade Accounts Receivable [Member]	'	'
Fair Values of Derivative Instruments	'	'
Derivative asset, fair value, gross asset	2	1
Derivative asset, fair value, gross liability	3	4
Not Designated as Hedging Instrument [Member] | Options Held [Member] | Commodity Contract [Member] | Accrued Expenses [Member]	'	'
Fair Values of Derivative Instruments	'	'
Derivative liability, fair value, gross asset	'	1
Derivative liability, fair value, gross liability	'	0
Not Designated as Hedging Instrument [Member] | Forward Contracts [Member] | Physical Purchase Contracts [Member] | Inventories [Member]	'	'
Fair Values of Derivative Instruments	'	'
Derivative asset, fair value, gross asset	0	11
Derivative asset, fair value, gross liability	17	0
Not Designated as Hedging Instrument [Member] | Forward Contracts [Member] | Foreign Currency Contract [Member] | Trade Accounts Receivable [Member]	'	'
Fair Values of Derivative Instruments	'	'
Derivative asset, fair value, gross asset	'	1
Derivative asset, fair value, gross liability	'	0
Not Designated as Hedging Instrument [Member] | Forward Contracts [Member] | Foreign Currency Contract [Member] | Accrued Expenses [Member]	'	'
Fair Values of Derivative Instruments	'	'
Derivative liability, fair value, gross asset	0	0
Derivative liability, fair value, gross liability	$5	$1

Price_Risk_Management_Activiti4

Price Risk Management Activities, Gain (Loss) by Income Statement Location (Details) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Price Risk Management Activities (Textual)	'	'	'	'
Gain (loss) from hedged firm commitment not qualifying as fair value hedge, net	$0	$0	$0	$28
Accumulated other comprehensive income, cumulative after-tax losses on cash flow hedges	-4	'	-4	'
Gain (loss) from cash flow hedges to be reclassified within 12 months	'	'	-4	'
Fair Value Hedging [Member] | Commodity Contract [Member] | Cost of Sales [Member]	'	'	'	'
Effect of Derivative Instruments on Income and OCI	'	'	'	'
Gain (loss) recognized in income on derivatives	-17	-127	-38	-307
Gain recognized in income on hedged item	19	101	41	238
Gain (loss) recognized in income on derivatives (ineffective portion)	2	-26	3	-69
Cash Flow Hedging [Member] | Commodity Contract [Member]	'	'	'	'
Effect of Derivative Instruments on Income and OCI	'	'	'	'
Gain (loss) recognized in OCI on derivatives (effective portion)	3	27	-6	43
Cash Flow Hedging [Member] | Commodity Contract [Member] | Cost of Sales [Member]	'	'	'	'
Effect of Derivative Instruments on Income and OCI	'	'	'	'
Gain reclassified from accumulated OCI into income (effective portion)	6	45	1	81
Gain (loss) recognized in income on derivatives (ineffective portion)	16	-3	13	23
Economic Hedging [Member]	'	'	'	'
Effect of Derivative Instruments on Income and OCI	'	'	'	'
Gain (loss) recognized in income on derivatives	-98	-354	219	47
Economic Hedging [Member] | Commodity Contract [Member] | Cost of Sales [Member]	'	'	'	'
Effect of Derivative Instruments on Income and OCI	'	'	'	'
Gain (loss) recognized in income on derivatives	-76	-333	205	90
Economic Hedging [Member] | Foreign Currency Contract [Member] | Cost of Sales [Member]	'	'	'	'
Effect of Derivative Instruments on Income and OCI	'	'	'	'
Gain (loss) recognized in income on derivatives	-22	-21	14	-43
Trading Derivatives [Member]	'	'	'	'
Effect of Derivative Instruments on Income and OCI	'	'	'	'
Gain (loss) recognized in income on derivatives	11	-13	-4	-9
Trading Derivatives [Member] | Commodity Contract [Member] | Cost of Sales [Member]	'	'	'	'
Effect of Derivative Instruments on Income and OCI	'	'	'	'
Gain (loss) recognized in income on derivatives	11	-13	16	-9
Trading Derivatives [Member] | RINs Fixed-Price Contracts [Member] | Cost of Sales [Member]	'	'	'	'
Effect of Derivative Instruments on Income and OCI	'	'	'	'
Gain (loss) recognized in income on derivatives	$0	$0	($20)	$0