Valero Energy (VLO) 10-K 26 Feb 15 2014 FY Annual report Financial data

Document_and_Entity_Informatio

Document and Entity Information (USD $)	12 Months Ended
In Billions, except Share data, unless otherwise specified	Dec. 31, 2014	Jan. 30, 2015	Jun. 30, 2014
Entity Information [Line Items]
Entity Registrant Name	VALERO ENERGY CORP/TX
Entity Central Index Key	1035002
Document Type	10-K
Document Period End Date	31-Dec-14
Amendment Flag	FALSE
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	FY
Current Fiscal Year End Date	-19
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Public Float			$26.50
Entity Common Stock, Shares Outstanding		514,888,348

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Current assets:
Cash and temporary cash investments	$3,689	$4,292
Receivables, net	5,879	8,751
Inventories	6,623	5,758
Income taxes receivable	97	72
Deferred income taxes	162	266
Prepaid expenses and other	164	138
Total current assets	16,614	19,277
Property, plant, and equipment, at cost	35,933	33,933
Accumulated depreciation	-9,198	-8,226
Property, plant, and equipment, net	26,735	25,707
Deferred charges and other assets, net	2,201	2,276
Total assets	45,550	47,260
Current liabilities:
Current portion of debt and capital lease obligations	606	303
Accounts payable	6,760	9,931
Accrued expenses	596	522
Taxes other than income taxes	1,209	1,345
Income taxes payable	433	773
Deferred income taxes	376	249
Total current liabilities	9,980	13,123
Debt and capital lease obligations, less current portion	5,780	6,261
Deferred income taxes	6,607	6,601
Other long-term liabilities	1,939	1,329
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	7,116	7,187
Treasury stock, at cost; 159,202,872 and 137,932,138 common shares	-8,125	-7,054
Retained earnings	22,046	18,970
Accumulated other comprehensive income (loss)	-367	350
Total Valero Energy Corporation stockholders’ equity	20,677	19,460
Noncontrolling interests	567	486
Total equity	21,244	19,946
Total liabilities and equity	$45,550	$47,260

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 31, 2014	Dec. 31, 2013
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	159,202,872	137,932,138

Consolidated_Statements_of_Inc

Consolidated Statements of Income (USD $)	12 Months Ended
In Millions, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Consolidated Statements of Income
Operating revenues	$130,844	$138,074	$138,393
Costs and expenses:
Cost of sales	118,141	127,316	126,485
Operating expenses:
Refining	3,900	3,710	3,513
Retail	0	226	686
Ethanol	487	387	332
General and administrative expenses	724	758	698
Depreciation and amortization expense	1,690	1,720	1,549
Asset impairment losses	0	0	86
Total costs and expenses	124,942	134,117	133,349
Operating income	5,902	3,957	5,044
Gain on disposition of retained interest in CST Brands, Inc.	0	325	0
Other income, net	47	59	10
Interest and debt expense, net of capitalized interest	-397	-365	-314
Income from continuing operations before income tax expense	5,552	3,976	4,740
Income tax expense	1,777	1,254	1,626
Income from continuing operations	3,775	2,722	3,114
Income (loss) from discontinued operations	-64	6	-1,034
Net income	3,711	2,728	2,080
Less: Net income (loss) attributable to noncontrolling interests	81	8	-3
Net income attributable to Valero Energy Corporation stockholders	3,630	2,720	2,083
Net income attributable to Valero Energy Corporation stockholders:
Continuing operations	3,694	2,714	3,117
Discontinued operations	-64	6	-1,034
Net income attributable to Valero Energy Corporation stockholders	$3,630	$2,720	$2,083
Earnings per common share:
Continuing operations	$7	$4.98	$5.64
Discontinued operations	($0.12)	$0.01	($1.87)
Total	$6.88	$4.99	$3.77
Weighted-average common shares outstanding (in millions)	526	542	550
Earnings per common share – assuming dilution:
Continuing operations	$6.97	$4.96	$5.61
Discontinued operations	($0.12)	$0.01	($1.86)
Total	$6.85	$4.97	$3.75
Weighted-average common shares outstanding – assuming dilution (in millions)	530	548	556
Dividends per common share	$1.05	$0.85	$0.65

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net income	$3,711	$2,728	$2,080
Other comprehensive income (loss):
Foreign currency translation adjustment	-407	-98	164
Net gain (loss) on pension and other postretirement benefits	-475	763	-211
Net gain (loss) on derivative instruments designated and qualifying as cash flow hedges	1	-2	-28
Other comprehensive income (loss) before income tax expense (benefit)	-881	663	-75
Income tax expense (benefit) related to items of other comprehensive income (loss)	-164	262	-87
Other comprehensive income (loss)	-717	401	12
Comprehensive income	2,994	3,129	2,092
Less: Comprehensive income (loss) attributable to noncontrolling interests	81	8	-3
Comprehensive income attributable to Valero Energy Corporation stockholders	$2,913	$3,121	$2,095

Consolidated_Statements_of_Equ

Consolidated Statements of Equity (USD $)	Total	Stock-Based Compensation Plans Repurchase Program [Member]	Common Stock Repurchase Program [Member]	Parent [Member]	Parent [Member]	Parent [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Treasury Stock [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Noncontrolling Interest [Member]
In Millions, unless otherwise specified					Stock-Based Compensation Plans Repurchase Program [Member]	Common Stock Repurchase Program [Member]			Stock-Based Compensation Plans Repurchase Program [Member]		Stock-Based Compensation Plans Repurchase Program [Member]	Common Stock Repurchase Program [Member]
Beginning balance at Dec. 31, 2011	$16,445			$16,423			$7	$7,486		($6,475)			$15,309	$96	$22
Increase (Decrease) in Equity Roll Forward
Net income (loss)	2,080			2,083									2,083		-3
Dividends on common stock	-360			-360									-360
Stock-based compensation expense	57			57				57
Tax deduction in excess of stock- based compensation expense	29			29				29
Transactions in connection with stock-based compensation plans:
Stock issuances	59			59				-260		319
Stock repurchases		-153	-118		-153	-118					-163	-118
Contributions from noncontrolling interests	44														44
Other									10
Other comprehensive income (loss)	12			12										12
Ending balance at Dec. 31, 2012	18,095			18,032			7	7,322		-6,437			17,032	108	63
Increase (Decrease) in Equity Roll Forward
Net income (loss)	2,728			2,720									2,720		8
Dividends on common stock	-462			-462									-462
Stock-based compensation expense	64			64				64
Tax deduction in excess of stock- based compensation expense	47			47				47
Transactions in connection with stock-based compensation plans:
Stock issuances	59			59				-243		302
Stock repurchases		-236	-692		-236	-692					-236	-692
Separation of retail business	-479			-479				-9		9			-320	-159
Net proceeds from initial public offering of common units of Valero Energy Partners LP	369														369
Contributions from noncontrolling interests	46														46
Other	6			6				6
Other comprehensive income (loss)	401			401										401
Ending balance at Dec. 31, 2013	19,946			19,460			7	7,187		-7,054			18,970	350	486
Increase (Decrease) in Equity Roll Forward
Net income (loss)	3,711			3,630									3,630		81
Dividends on common stock	-554			-554									-554
Stock-based compensation expense	60			60				60
Tax deduction in excess of stock- based compensation expense	47			47				47
Transactions in connection with stock-based compensation plans:
Stock issuances	47			47				-178		225
Stock repurchases		-128	-1,168		-128	-1,168					-128	-1,168
Contributions from noncontrolling interests	12														12
Distributions to public unitholders of Valero Energy Partners LP	-12														-12
Other comprehensive income (loss)	-717			-717										-717
Ending balance at Dec. 31, 2014	$21,244			$20,677			$7	$7,116		($8,125)			$22,046	($367)	$567

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities:
Net income	$3,711	$2,728	$2,080
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization expense	1,690	1,720	1,574
Aruba Refinery asset retirement expense and other	63	0	0
Gain on disposition of retained interest in CST Brands, Inc.	0	-325	0
Asset impairment losses	0	0	1,014
Stock-based compensation expense	60	64	58
Deferred income tax expense	445	501	963
Changes in current assets and current liabilities	-1,810	922	-302
Changes in deferred charges and credits and other operating activities, net	82	-46	-117
Net cash provided by operating activities	4,241	5,564	5,270
Cash flows from investing activities:
Capital expenditures	-2,153	-2,121	-2,931
Deferred turnaround and catalyst costs	-649	-634	-479
Proceeds from the sale of the Paulsboro Refinery	0	0	160
Other investing activities, net	-42	-57	-101
Net cash used in investing activities	-2,844	-2,812	-3,351
Cash flows from financing activities:
Proceeds from debt borrowings	28	0	2,900
Repayments of debt	-200	-480	-3,612
Proceeds from the exercise of stock options	47	59	59
Purchase of common stock for treasury	-1,296	-928	-281
Common stock dividends	-554	-462	-360
Net proceeds from initial public offering of common units of Valero Energy Partners LP	0	369	0
Contributions from noncontrolling interests	12	45	44
Distributions to public unitholders of Valero Energy Partners LP	-12	0	0
Disposition of retail business:
Proceeds from short-term debt in anticipation of separation	0	550	0
Cash distributed to Valero by CST Brands, Inc.	0	500	0
Cash held and retained by CST Brands, Inc. upon separation	0	-315	0
Proceeds from short-term debt related to disposition of retained interest	0	525	0
Repayments of short-term debt related to disposition of retained interest	0	-58	0
Other financing activities, net	45	32	17
Net cash used in financing activities	-1,930	-163	-1,233
Effect of foreign exchange rate changes on cash	-70	-20	13
Net increase (decrease) in cash and temporary cash investments	-603	2,569	699
Cash and temporary cash investments at beginning of year	4,292	1,723	1,024
Cash and temporary cash investments at end of year	$3,689	$4,292	$1,723

Basis_of_Presentation_and_Summ

Basis of Presentation and Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2014
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
	General
	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. We are an independent petroleum refining and marketing company and own 15 refineries with a combined throughput capacity of approximately 2.9 million barrels per day as of December 31, 2014. We market branded and unbranded refined products on a wholesale basis in the United States (U.S.), Canada, the Caribbean, the United Kingdom (U.K.), and Ireland through an extensive bulk and rack marketing network and through approximately 7,400 outlets that carry the Valero®, Shamrock®, Ultramar®, Beacon®, and Texaco® brand names. We also own 11 ethanol plants in the U.S. that primarily produce ethanol with a combined production capacity of approximately 1.3 billion gallons per year as of December 31, 2014. Our operations are affected by:
	•	company-specific factors, primarily refinery utilization rates and refinery maintenance turnarounds;
	•	seasonal factors, such as the demand for refined products during the summer driving season and heating oil during the winter season; and
	•	industry factors, such as movements in and the level of crude oil prices including the effect of quality differentials between grades of crude oil, the demand for and prices of refined products, industry supply capacity, and competitor refinery maintenance turnarounds.
	Reclassifications
	Certain amounts reported as of and for the year ended December 31, 2013 have been reclassified to conform to the 2014 presentation. As discussed in Note 2, in May 2014, we abandoned the Aruba Refinery. As a result, the refinery’s results of operations have been presented as discontinued operations in the consolidated statements of income for all years presented.
	Significant Accounting Policies
	Principles of Consolidation
	These financial statements include the accounts of Valero, and subsidiaries and entities in which Valero has a controlling financial interest. The ownership of noncontrolling investors are recorded as noncontrolling interests. Intercompany balances and transactions have been eliminated in consolidation. Investments in significant noncontrolled entities are accounted for using the equity method.
	Use of Estimates
	The preparation of financial statements in conformity with U.S. generally accepted accounting principles (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.
	Cash and Temporary Cash Investments
	Our temporary cash investments are highly liquid, low-risk debt instruments that have a maturity of three months or less when acquired.
	Receivables
	Trade receivables are carried at original invoice amount. We maintain an allowance for doubtful accounts, which is adjusted based on management’s assessment of our customers’ historical collection experience, known credit risks, and industry and economic conditions.
	Inventories
	Inventories are carried at the lower of cost or market. The cost of refinery feedstocks purchased for processing, refined products, and grain and ethanol inventories are determined under the last-in, first-out (LIFO) method using the dollar-value LIFO method, with any increments valued based on average purchase prices during the year. The cost of feedstocks and products purchased for resale and the cost of materials and supplies are determined principally under the weighted-average cost method.
	Property, Plant, and Equipment
	The cost of property, plant, and equipment (property assets) purchased or constructed, including betterments of property assets, is capitalized. However, the cost of repairs to and normal maintenance of property assets is expensed as incurred. Betterments of property assets are those that extend the useful life, increase the capacity or improve the operating efficiency of the asset, or improve the safety of our operations. The cost of property assets constructed includes interest and certain overhead costs allocable to the construction activities.
	Our operations, especially those of our refining segment, are highly capital intensive. Each of our refineries comprises a large base of property assets, consisting of a series of interconnected, highly integrated and interdependent crude oil processing facilities and supporting logistical infrastructure (Units), and these Units are continuously improved. Improvements consist of the addition of new Units and betterments of existing Units. We plan for these improvements by developing a multi-year capital program that is updated and revised based on changing internal and external factors.
	Depreciation of property assets used in our refining segment is recorded on a straight-line basis over the estimated useful lives of these assets primarily using the composite method of depreciation. We maintain a separate composite group of property assets for each of our refineries. We estimate the useful life of each group based on an evaluation of the property assets comprising the group, and such evaluations consist of, but are not limited to, the physical inspection of the assets to determine their condition, consideration of the manner in which the assets are maintained, assessment of the need to replace assets, and evaluation of the manner in which improvements impact the useful life of the group. The estimated useful lives of our composite groups range primarily from 25 to 30 years.
	Under the composite method of depreciation, the cost of an improvement is added to the composite group to which it relates and is depreciated over that group’s estimated useful life. We design improvements to our refineries in accordance with engineering specifications, design standards and practices accepted in our industry, and these improvements have design lives consistent with our estimated useful lives. Therefore, we believe the use of the group life to depreciate the cost of improvements made to the group is reasonable because the estimated useful life of each improvement is consistent with that of the group. It should be noted, however, that factors such as competition, regulation, or environmental matters could cause us to change our estimates, thus impacting depreciation expense in the future.
	Also under the composite method of depreciation, the historical cost of a minor property asset (net of salvage value) that is retired or replaced is charged to accumulated depreciation and no gain or loss is recognized in income. However, a gain or loss is recognized in income for a major property asset that is retired, replaced, or sold and for an abnormal disposition of a property asset (primarily involuntary conversions). Gains and losses are reflected in depreciation and amortization expense, unless such amounts are reported separately due to materiality.
	Depreciation of property assets used in our ethanol segment and our former retail segment (see Note 3) is recorded on a straight-line basis over the estimated useful lives of the related assets. Leasehold improvements are amortized on a straight-line basis over the shorter of the lease term or the estimated useful life of the related asset. Assets acquired under capital leases are amortized on a straight-line basis over (i) the lease term if transfer of ownership does not occur at the end of the lease term or (ii) the estimated useful life of the asset if transfer of ownership does occur at the end of the lease term.
	Deferred Charges and Other Assets
	“Deferred charges and other assets, net” include the following:
	•	turnaround costs, which are incurred in connection with planned major maintenance activities at our refineries and ethanol plants and which are deferred when incurred and amortized on a straight-line basis over the period of time estimated to lapse until the next turnaround occurs;
	•	fixed-bed catalyst costs, representing the cost of catalyst that is changed out at periodic intervals when the quality of the catalyst has deteriorated beyond its prescribed function, which are deferred when incurred and amortized on a straight-line basis over the estimated useful life of the specific catalyst;
	•	intangible assets;
	•	investments in entities that we do not control; and
	•	other noncurrent assets such as investments of certain benefit plans (related primarily to certain U.S. nonqualified defined benefit plans whose plan assets are not protected from our creditors and therefore cannot be reflected as a reduction from our obligations under those pension plans), debt issuance costs, and various other costs.
	Impairment of Assets
	Long-lived assets, which include property, plant, and equipment, intangible assets, and deferred refinery turnaround and catalysts costs, are tested for recoverability whenever events or changes in circumstances indicate that the carrying amount of the asset may not be recoverable. A long-lived asset is not recoverable if its carrying amount exceeds the sum of the undiscounted cash flows expected to result from its use and eventual disposition. If a long-lived asset is not recoverable, an impairment loss is recognized for the amount by which the carrying amount of the long-lived asset exceeds its fair value, with fair value determined based on discounted estimated net cash flows or other appropriate methods. See Notes 2 and 4 for our impairment analysis of our long-lived assets.
	We evaluate our equity method investments for impairment when there is evidence that we may not be able to recover the carrying amount of our investments or the investee is unable to sustain an earnings capacity that justifies the carrying amount. A loss in the value of an investment that is other than a temporary decline is recognized currently in income, and is based on the difference between the estimated current fair value of the investment and its carrying amount.
	Environmental Matters
	Liabilities for future remediation costs are recorded when environmental assessments and/or remedial efforts are probable and the costs can be reasonably estimated. Other than for assessments, the timing and magnitude of these accruals generally are based on the completion of investigations or other studies or a commitment to a formal plan of action. Amounts recorded for environmental liabilities have not been reduced by possible recoveries from third parties and have not been measured on a discounted basis.
	Asset Retirement Obligations
	We record a liability, which is referred to as an asset retirement obligation, at fair value for the estimated cost to retire a tangible long-lived asset at the time we incur that liability, which is generally when the asset is purchased, constructed, or leased. We record the liability when we have a legal obligation to incur costs to retire the asset and when a reasonable estimate of the fair value of the liability can be made. If a reasonable estimate cannot be made at the time the liability is incurred, we record the liability when sufficient information is available to estimate the liability’s fair value.
	Foreign Currency Translation
	The functional currency of each of our international operations is generally the respective local currency, which includes the Canadian dollar, the Aruban florin, the pound sterling, and the euro. Balance sheet accounts are translated into U.S. dollars using exchange rates in effect as of the balance sheet date. Revenue and expense accounts are translated using the weighted-average exchange rates during the year presented. Foreign currency translation adjustments are recorded as a component of accumulated other comprehensive income.
	Revenue Recognition
	Revenues for products sold by the refining and ethanol segments and our former retail segment (see Note 3) are recorded upon delivery of the products to our customers, which is the point at which title to the products is transferred, and when payment has either been received or collection is reasonably assured.
	Excise taxes on sales by our U.S. retail system were presented on a gross basis. All other excise taxes are presented on a net basis.
	We enter into certain purchase and sale arrangements with the same counterparty that are deemed to be made in contemplation of one another. We combine these transactions and, as a result, revenues and cost of sales are not recognized in connection with these arrangements. We also enter into refined product exchange transactions to fulfill sales contracts with our customers by accessing refined products in markets where we do not operate our own refineries. These refined product exchanges are accounted for as exchanges of non-monetary assets, and no revenues are recorded on these transactions.
	Product Shipping and Handling Costs
	Costs incurred for shipping and handling of products are included in cost of sales.
	Cost of Biofuel Credits
	We purchase biofuel credits (primarily Renewable Identification Numbers (RINs) in the U.S.) to comply with government regulations that require us to blend a certain percentage of biofuels into the products we produce, as further described in Note 21 under “Compliance Program Price Risk.” To the degree that we are unable to blend biofuels at the required percentage, we must purchase biofuel credits in the open market to meet our obligation. The cost of purchased biofuel credits is charged to cost of sales as such credits are needed to satisfy our obligation. To the extent we have not purchased enough biofuel credits to satisfy our obligation as of the balance sheet date, we charge cost of sales for such deficiency based on the market price of the biofuel credits as of the balance sheet date, and we record a liability for our obligation to purchase those credits. See Note 20 for disclosure of our fair value liability.
	Stock-Based Compensation
	Compensation expense for our share-based compensation plans is based on the fair value of the awards granted and is recognized in income on a straight-line basis over the shorter of (a) the requisite service period of each award or (b) the period from the grant date to the date retirement eligibility is achieved if that date is expected to occur during the nominal vesting period.
	Income Taxes
	Income taxes are accounted for under the asset and liability method. Under this method, deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. Deferred amounts are measured using enacted tax rates expected to apply to taxable income in the year those temporary differences are expected to be recovered or settled. Deferred tax assets are reduced by unrecognized tax benefits, if such items may be available to offset the unrecognized tax benefit.
	We have elected to classify any interest expense and penalties related to the underpayment of income taxes in income tax expense.
	Earnings per Common Share
	Earnings per common share is computed by dividing net income by the weighted-average number of common shares outstanding for the year. Participating share-based payment awards, including shares of restricted stock granted under certain of our stock-based compensation plans, are included in the computation of basic earnings per share using the two-class method. Earnings per common share – assuming dilution reflects the potential dilution arising from our outstanding stock options and nonvested shares granted to employees in connection with our stock-based compensation plans. Potentially dilutive securities are excluded from the computation of earnings per common share – assuming dilution when the effect of including such shares would be antidilutive.
	Financial Instruments
	Our financial instruments include cash and temporary cash investments, receivables, payables, debt, capital lease obligations, commodity derivative contracts, and foreign currency derivative contracts. The estimated fair values of these financial instruments approximate their carrying amounts, except for certain debt as discussed in Note 20.
	Derivatives and Hedging
	All derivative instruments are recorded in the balance sheet as either assets or liabilities measured at their fair values. 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, are 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 in 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 hedging relationships (derivative instruments not designated as fair value or cash flow hedges) and for derivative instruments entered into 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 the statements of cash flows.
	New Accounting Pronouncements
In April 2014, the provisions of Accounting Standards Codification (ASC) Topic 205, “Presentation of Financial Statements,” and ASC Topic 360, “Property, Plant, and Equipment,” were amended to change the criteria for reporting discontinued operations. The provisions of these amendments modify the definition of discontinued operations by limiting discontinued operations reporting to disposals of components of an entity that represent strategic shifts that have or will have a major effect on an entity’s operations and financial results. These amendments require additional disclosures about discontinued operations and new disclosures for other disposals of individually material components of an organization that do not meet the definition of a discontinued operation. In addition, the guidance allows companies to have significant continuing involvement and continuing cash flows with the discontinued operation. These provisions are effective prospectively for annual reporting periods beginning on or after December 15, 2014, and interim periods within those annual periods, with early adoption permitted. The adoption of this guidance effective January 1, 2015 will not affect our financial position or results of operations; however, it may result in changes to the manner in which future dispositions of operations or assets, if any, are presented in our financial statements, or it may require additional disclosures.
In May 2014, the Financial Accounting Standards Board (FASB) amended the ASC and issued a new accounting standard, Topic 606, “Revenue from Contracts with Customers,” to clarify the principles for recognizing revenue. The core principle of the new standard is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The standard also requires improved interim and annual disclosures that enable the users of financial statements to better understand the nature, amount, timing, and uncertainty of revenues and cash flows arising from contracts with customers. The new standard is effective for annual reporting periods beginning after December 15, 2016, including interim reporting periods within that reporting period, and can be adopted either retrospectively to each prior reporting period presented using a practical expedient, as allowed by the new standard, or retrospectively with a cumulative effect adjustment to retained earnings as of the date of initial application. Early adoption is not permitted. We are currently evaluating the effect that adopting this new standard will have on our financial statements and related disclosures.
In January 2015, the provisions of ASC Subtopic 225-20, “Income Statement–Extraordinary and Unusual Items” were amended to eliminate the concept of extraordinary items from U.S. GAAP as part of the FASB’s simplification initiative. The guidance eliminates the separate presentation of extraordinary items on the income statement, net of tax and the related earnings per share, but does not affect the requirement to disclose material items that are unusual in nature or infrequently occurring or to exclude those items from the estimated annual effective tax rate for interim reporting purposes. These provisions may be applied prospectively or retrospectively and are effective for annual reporting periods beginning after December 15, 2015, and interim periods within those annual periods, with early adoption permitted. The adoption of this guidance effective January 1, 2016 will not affect our financial position or results of operations; however, it may affect the manner in which future extraordinary or unusual items, if any, are presented in our financial statements.
In February 2015, the provisions of ASC Topic 810, “Consolidation” were amended to improve consolidation guidance for certain types of legal entities. The guidance modifies the evaluation of whether limited partnerships and similar legal entities are variable interest entities (VIEs) or voting interest entities, eliminates the presumption that a general partner should consolidate a limited partnership, affects the consolidation analysis of reporting entities that are involved with VIEs, particularly those that have fee arrangements and related party relationships, and provides a scope exception from consolidation guidance for certain money market funds. These provisions are effective for annual reporting periods beginning after December 15, 2015, and interim periods within those annual periods, with early adoption permitted. These provisions may also be adopted retrospectively in previously issued financial statements for one or more years with a cumulative-effect adjustment to retained earnings as of the beginning of the first year restated. We are currently evaluating the effect that adopting this new accounting standard will have on our consolidated financial statements and related disclosures.

Discontinued_Operations

Discontinued Operations	12 Months Ended
	Dec. 31, 2014
Discontinued Operations and Disposal Groups [Abstract]
DISCONTINUED OPERATIONS
	2	DISCONTINUED OPERATIONS
	In May 2014, we abandoned our Aruba Refinery, except for the associated crude oil and refined products terminal assets that we continue to operate. As a result, the refinery’s results of operations have been presented in this report as discontinued operations for all years presented.
	We had suspended operations of the refinery in 2012 and at that time we wrote off the entire carrying value of the refinery’s idled crude oil processing units and related infrastructure (refining assets) and supplies inventories that supported the refining operations; as a result, we recognized an asset impairment loss of $928 million. In addition, we terminated the employees who supported the refining operations and incurred severance costs of $41 million at that time. Even though we suspended refining operations in 2012, we continued to maintain the refining assets to allow them to be restarted and did not abandon them until our recent decision to no longer pursue options to restart refining operations.
	The Aruba Refinery resides on land leased from the Government of Aruba (GOA) and our agreements with the GOA require us to dismantle our leasehold improvements under certain conditions. Because of our May 2014 decision to abandon the refining assets, we believe the GOA will require us to dismantle those assets. As a result, we recognized an asset retirement obligation of $59 million, which was charged to expense during the second quarter of 2014 and is reflected in discontinued operations. We had not recognized an asset retirement obligation previously due to our belief that we would not be required to dismantle the assets as long as we intended to operate them. During the second quarter of 2014, we also recognized liabilities of $4 million relating to obligations under certain contracts, including a liability for the remaining lease payments for the land on which the refining assets reside.
	Selected results of operations of the Aruba Refinery are shown below (in millions).
		Year Ended December 31,
		2014			2013		2012
	Operating revenues	$	—		$	—	$	857
	Income (loss) before income taxes	(64		)	6		(1,034		)
	There was no tax benefit recognized for the loss from discontinued operations for the years ended December 31, 2014 and 2012 as we do not expect to realize this tax benefit.

Separation_of_Retail_Business

Separation of Retail Business	12 Months Ended
	Dec. 31, 2014
Disposal Group, Not Discontinued Operation, Disposal Disclosures [Abstract]
SEPARATION OF RETAIL BUSINESS
	3	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. 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.
	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 11 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. We also incurred $30 million in costs during the three months ended June 30, 2013 to effect the separation, which were included in general and administrative expenses.
	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.
	On November 14, 2013, we disposed of our 20 percent retained interest in CST by transferring all remaining shares of CST common stock owned by us to a third-party financial institution in exchange for $467 million of our short-term debt and recognized a $325 million nontaxable gain, as further described in Note 11.
	Selected historical results of operations of our retail business prior to the separation are disclosed in Note 18. Subsequent to May 1, 2013 and through November 14, 2013, our share of CST’s results of operations was reflected in “other income, net.” Our share of income taxes incurred directly by CST during this period was reported in the equity in earnings from CST, and as such was 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 were excluded from our consolidated balance sheet as of December 31, 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.

Impairments

Impairments	12 Months Ended
	Dec. 31, 2014
Property, Plant and Equipment Impairment or Disposal [Abstract]
IMPAIRMENTS
	4	IMPAIRMENTS
	Cancelled Capital Projects
	During 2012, we wrote down the carrying value of equipment associated with permanently cancelled capital projects at several of our refineries and recognized asset impairment losses of $65 million.
	Retail Stores
	During 2012, we evaluated certain of our convenience stores operated by our former retail segment for potential impairment and concluded that they were impaired, and we wrote down the carrying values of these stores to their estimated fair values and recognized asset impairment losses of $21 million.

Valero_Energy_Partners_LP

Valero Energy Partners LP	12 Months Ended
	Dec. 31, 2014
Noncontrolling Interest [Abstract]
VALERO ENERGY PARTNERS LP
	5	VALERO ENERGY PARTNERS LP
	In July 2013, we formed VLP, a master limited partnership, to own, operate, develop, and acquire crude oil and refined petroleum products pipelines, terminals, and other transportation and logistics assets. On December 16, 2013, VLP completed its initial public offering (the Offering) of 17,250,000 common units at a price of $23.00 per unit. VLP received $369 million in net proceeds from the sale of the units, after deducting underwriting fees, structuring fees, and other offering costs. As of December 31, 2014, VLP’s assets included 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 Ardmore, McKee, Memphis, Port Arthur, and Three Rivers Refineries.
	As of December 31, 2014 and 2013, we owned a 68.6 percent limited partner interest and a 2 percent general partner interest in VLP, and the public owned a 29.4 percent limited partner interest. VLP’s cash and temporary cash investments were $237 million and $375 million as of December 31, 2014 and 2013, respectively. Valero consolidates the financial statements of VLP into its financial statements and as such, VLP’s cash and temporary cash investments are included in Valero’s consolidated cash and temporary cash investments. However, VLP’s cash and temporary cash investments can be used to settle only its obligations. In addition, VLP’s partnership capital attributable to the public’s ownership interest in VLP of $375 million and $370 million as of December 31, 2014 and 2013, respectively, is reflected in noncontrolling interests.
	We have agreements with VLP that establish fees for certain general and administrative services and operational and maintenance services provided by us. In addition, we have a master transportation services agreement and a master terminal services agreement with VLP under which VLP provides commercial transportation and terminaling services to us. These transactions are eliminated in consolidation.
	On July 1, 2014, we sold our Texas Crude Systems Business to VLP. That business is engaged in transporting, terminaling, and storing crude oil and refined petroleum products through various pipeline and terminal systems that compose the McKee Crude System, the Three Rivers Crude System, and the Wynnewood Products System. We sold the Texas Crude Systems Business for total cash consideration of $154 million. Because we consolidate the financial statements of VLP into our financial statements, this transaction was eliminated in consolidation and did not impact our consolidated financial position or cash flows.

Receivables

Receivables	12 Months Ended
	Dec. 31, 2014
Receivables [Abstract]
RECEIVABLES
	6	RECEIVABLES
	Receivables consisted of the following (in millions):
		December 31,
		2014			2013
	Accounts receivable	$	5,509		$	8,582
	Commodity derivative and foreign currency	151			98
	contract receivables
	Other receivables	256			117
		5,916			8,797
	Allowance for doubtful accounts	(37		)	(46		)
	Receivables, net	$	5,879		$	8,751
	Changes in the allowance for doubtful accounts consisted of the following (in millions):
		Year Ended December 31,
		2014			2013			2012
	Balance as of beginning of year	$	46		$	56		$	48
	Increase in allowance charged to expense	7			13			21
	Accounts charged against the allowance,	(15		)	(23		)	(13		)
	net of recoveries
	Foreign currency translation	(1		)	—			—
	Balance as of end of year	$	37		$	46		$	56

Inventories

Inventories	12 Months Ended
	Dec. 31, 2014
Inventory Disclosure [Abstract]
INVENTORIES
	7	INVENTORIES
	Inventories consisted of the following (in millions):
		December 31,
		2014		2013
	Refinery feedstocks	$	2,269	$	2,135
	Refined products and blendstocks	3,926		3,231
	Ethanol feedstocks and products	195		166
	Materials and supplies	233		226
	Inventories	$	6,623	$	5,758
	As of December 31, 2014, the volumes of our refinery feedstocks and refined products and blendstocks held as inventory increased, which resulted in a LIFO increment. During the years ended December 31, 2013 and 2012, we had net liquidations of LIFO inventory layers that decreased cost of sales in each of those years by $17 million and $134 million, respectively.
	As of December 31, 2014 and 2013, the replacement cost (market value) of LIFO inventories exceeded their LIFO carrying amounts by approximately $857 million and $6.9 billion, respectively. As of December 31, 2014 and 2013, our non-LIFO inventories accounted for $906 million and $681 million, respectively, of our total inventories.

Property_Plant_and_Equipment

Property, Plant, and Equipment	12 Months Ended
	Dec. 31, 2014
Property, Plant and Equipment [Abstract]
PROPERTY, PLANT, AND EQUIPMENT
	8	PROPERTY, PLANT, AND EQUIPMENT
	Major classes of property, plant, and equipment, which include capital lease assets, consisted of the following (in millions):
			December 31,
			2014			2013
	Land		$	396		$	404
	Crude oil processing facilities		28,054			27,260
	Pipeline and terminal facilities		1,955			1,513
	Grain processing equipment		779			719
	Administrative buildings		800			800
	Other		2,596			2,109
	Construction in progress		1,353			1,128
	Property, plant, and equipment, at cost		35,933			33,933
	Accumulated depreciation		(9,198		)	(8,226		)
	Property, plant, and equipment, net		$	26,735		$	25,707
	We have various assets under capital leases that primarily support our refining operations totaling $72 million and $74 million as of December 31, 2014 and 2013, respectively. Accumulated amortization on assets under capital leases was $40 million and $35 million as of December 31, 2014 and 2013, respectively.
	Depreciation expense for the years ended December 31, 2014, 2013, and 2012 was $1.2 billion, $1.2 billion, and $1.1 billion, respectively.

Deferred_Charges_and_Other_Ass

Deferred Charges and Other Assets	12 Months Ended
	Dec. 31, 2014
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
DEFERRED CHARGES AND OTHER ASSETS
	9	DEFERRED CHARGES AND OTHER ASSETS
	“Deferred charges and other assets, net” primarily includes turnaround and catalyst costs, which are deferred and amortized as discussed in Note 1. Amortization expense for deferred refinery turnaround and catalyst costs and other assets was $489 million, $498 million, and $447 million for the years ended December 31, 2014, 2013, and 2012, respectively.

Accrued_Expenses_and_Other_Lon

Accrued Expenses and Other Long-Term Liabilities	12 Months Ended
	Dec. 31, 2014
Accrued Expenses and Other Long-Term Liabilities [Abstract]
ACCRUED EXPENSES AND OTHER LONG-TERM LIABILITIES
	10	ACCRUED EXPENSES AND OTHER LONG-TERM LIABILITIES
	Accrued expenses and other long-term liabilities consisted of the following (in millions):
			Accrued						Other Long-
			Expenses						Term Liabilities
			December 31,
			2014			2013			2014		2013
	Defined benefit plan liabilities (see Note 14)		$	48		$	30		$	792	$	507
	Wage and other employee-related liabilities		294			257			104		97
	Uncertain income tax position liabilities,		—			—			316		205
	including related penalties and interest (see Note 16) (a)
	Environmental liabilities		26			24			269		277
	Accrued interest expense		88			90			—		—
	Derivative liabilities		—			13			—		—
	Asset retirement obligations		20			5			71		26
	Other accrued liabilities		120			103			387		217
	Accrued expenses and other long-term liabilities		$	596		$	522		$	1,939	$	1,329
	___________________________
	(a) As of December 31, 2014, our total liability for uncertain tax positions, including related penalties and interest, was $484 million, with $168 million classified as a current liability and reflected in “Income taxes payable” and the remaining $316 million classified as a long-term liability and reflected in “Other long-term liabilities” as detailed in this table. As of December 31, 2013, our total liability for uncertain tax positions, including related penalties and interest, was $443 million, with $238 million classified as a current liability and reflected in “Income taxes payable” and the remaining $205 million classified as a long-term liability and reflected in “Other long-term liabilities” as detailed in this table.
	Environmental Liabilities
	Changes in our environmental liabilities were as follows (in millions):
		Year Ended December 31,
		2014			2013			2012
	Balance as of beginning of year	$	301		$	269		$	274
	Additions to liability	26			67			23
	Reductions to liability	—			(1		)	(1		)
	Payments, net of third-party recoveries	(27		)	(28		)	(29		)
	Separation of retail business	—			(4		)	—
	Foreign currency translation	(5		)	(2		)	2
	Balance as of end of year	$	295		$	301		$	269
	See Note 12 for further information regarding environmental matters.
	Asset Retirement Obligations
	We have asset retirement obligations with respect to certain of our refinery assets due to various legal obligations to clean and/or dispose of various component parts of each refinery at the time they are retired. However, these component parts can be used for extended and indeterminate periods of time as long as they are properly maintained and/or upgraded. It is our practice and current intent to maintain our refinery assets and continue making improvements to those assets based on technological advances. As a result, we believe that our refineries have indeterminate lives for purposes of estimating asset retirement obligations because dates or ranges of dates upon which we would retire refinery assets cannot reasonably be estimated at this time. When a date or range of dates can reasonably be estimated for the retirement of any component part of a refinery, we estimate the cost of performing the retirement activities and record a liability for the fair value of that cost using established present value techniques.
	Prior to the separation of our retail business, we also had asset retirement obligations for the removal of underground storage tanks (USTs) at owned and leased retail sites. There is no legal obligation to remove USTs while they remain in service. However, environmental laws in the U.S. and Canada require that unused USTs be removed within certain periods of time after the USTs are no longer in service, usually one to two years depending on the jurisdiction in which the USTs are located. We had previously estimated that USTs at our formerly owned retail sites would remain in service approximately 20 years and that we would then have an obligation to remove those USTs. For our formerly leased retail sites, our lease agreements generally required that we remove certain improvements, primarily USTs and signage, upon termination of the lease. All of the USTs and the related asset retirement obligations were retained by CST after the separation from us. Therefore, we have no asset retirement obligations in connection with the USTs subsequent to the separation of our retail business on May 1, 2013.
	Changes in our asset retirement obligations were as follows (in millions).
		Year Ended December 31,
		2014			2013			2012
	Balance as of beginning of year	$	31		$	108		$	87
	Additions to accrual	60			2			14
	Revisions in estimated cash flows	—			—			13
	Accretion expense	1			2			5
	Settlements	(1		)	(1		)	(11		)
	Separation of retail business	—			(80		)	—
	Balance as of end of year	$	91		$	31		$	108
	See Note 2 for further information regarding the 2014 additions to accrual related to our Aruba Refinery.
	There are no assets that are legally restricted for purposes of settling our asset retirement obligations.

Debt_and_Capital_Lease_Obligat

Debt and Capital Lease Obligations	12 Months Ended
	Dec. 31, 2014
Debt and Capital Lease Obligations [Abstract]
DEBT AND CAPITAL LEASE OBLIGATIONS
	11	DEBT AND CAPITAL LEASE OBLIGATIONS
	Debt, at stated values, and capital lease obligations consisted of the following (in millions):
		Final		December 31,
		Maturity		2014				2013
	Bank credit facilities	Various		$	—			$	—
	Senior Notes:
	4.50%	2015		400				400
	4.75%	2014		—				200
	6.13%	2017		750				750
	6.13%	2020		850				850
	6.63%	2037		1,500				1,500
	6.75%	2037		24				24
	7.20%	2017		200				200
	7.45%	2097		100				100
	7.50%	2032		750				750
	8.75%	2030		200				200
	9.38%	2019		750				750
	10.50%	2039		250				250
	Debentures:
	7.65%	2026		100				100
	8.75%	2015		75				75
	Gulf Opportunity Zone Revenue Bonds, Series 2010, 4.0%	2040		300				300
	Accounts receivable sales facility	2015		100				100
	Other debt	2015		26				—
	Net unamortized discount, including fair value adjustments			(21		)		(24		)
	Total debt			6,354				6,525
	Capital lease obligations, including unamortized fair value adjustments			32				39
	Total debt and capital lease obligations			6,386				6,564
	Less current portion			(606		)		(303		)
	Debt and capital lease obligations, less current portion			$	5,780			$	6,261
	Credit Facilities
	Revolver
	We have a $3 billion revolving credit facility (the Revolver) with a group of financial institution lenders that has a maturity date of November 2018. We have the option to increase the aggregate commitments under the Revolver to $4.5 billion, subject to, among other things, the consent of the existing lenders whose commitments will be increased or any additional lenders providing such additional capacity. We may request additional one-year extensions, subject to certain conditions, including the consent of the lenders holding the majority of the commitments and each lender extending its individual commitment. The Revolver includes sub-facilities for swingline loans and letters of credit.
	Outstanding borrowings under the Revolver bear interest, at our option, at either (a) the adjusted LIBO rate (as defined in the Revolver) for the applicable interest period in effect from time to time plus the applicable margin or (b) the alternate base rate (as defined in the Revolver) plus the applicable margin. The interest rate and fees under the Revolver are subject to adjustment based upon the credit ratings assigned to our senior unsecured debt. We are also charged various fees and expenses in connection with the Revolver, including facility fees and letter of credit fees. The Revolver has certain restrictive covenants, including a maximum debt-to-capitalization ratio of 60 percent. Our debt-to-capitalization ratio, calculated in accordance with the terms of the Revolver, was 12 percent as of December 31, 2014 and 2013.
	VLP Revolver
	VLP has a $300 million senior unsecured revolving credit facility agreement (the VLP Revolver) with a group of lenders that has a maturity date of December 2018. The VLP Revolver is available only to the operations of VLP, and creditors of VLP do not have recourse against Valero. VLP has the option to increase the aggregate commitments under the VLP Revolver to $500 million, subject to, among other things, the consent of the existing lenders whose commitments will be increased or any additional lenders providing such additional capacity. VLP may request two additional one-year extensions, subject to certain conditions. VLP may terminate the VLP Revolver with notice to the lenders of at least three business days prior to termination. The VLP Revolver includes sub-facilities for swingline loans and letters of credit. VLP’s obligations under the VLP Revolver will be jointly and severally guaranteed by all of VLP’s directly owned material subsidiaries. As of December 31, 2014, the only guarantor under the VLP Revolver was Valero Partners Operating Co. LLC.
	Outstanding borrowings under the VLP Revolver bear interest, at VLP’s option, at either (a) the adjusted LIBO rate (as defined in the VLP Revolver) for the applicable interest period in effect from time to time plus the applicable margin or (b) the alternate base rate (as defined in the VLP Revolver) plus the applicable margin. The VLP Revolver also provides for customary fees, including administrative agent fees, participation fees, and commitment fees. The VLP Revolver contains certain restrictive covenants, including a ratio of total debt to EBITDA (as defined in the VLP Revolver) for the prior four fiscal quarters of not greater than 5.0 to 1.0 as of the last day of each fiscal quarter, and limitations on VLP’s ability to pay distributions to its unitholders.
	Canadian Revolver
	One of our Canadian subsidiaries has a C$50 million committed revolving credit facility (the Canadian Revolver) under which it may borrow and obtain letters of credit that has a maturity date of November 2015.
	Activities Under Our Credit Facilities
	During the years ended December 31, 2014 and 2013, we had no borrowings or repayments under the Revolver, the VLP Revolver, or the Canadian Revolver. During the year ended December 31, 2012, we borrowed and repaid $1.1 billion under the Revolver and had no borrowings or repayments under the Canadian Revolver.
	Letters of Credit
	We had outstanding letters of credit under our committed lines of credit as follows (in millions):
									Amounts Outstanding
			Borrowing				Expiration		December 31,
			Capacity						2014				2013
	Letter of credit facilities		$	550			Jun-15		$	56			$	278
	Revolver		$	3,000			Nov-18		$	54			$	59
	VLP Revolver		$	300			Dec-18		$	—			$	—
	Canadian Revolver		C$	50			Nov-15		C$	10			C$	10
	We also have various other uncommitted short-term bank credit facilities. As of December 31, 2014 and 2013, we had no borrowings outstanding under our uncommitted short-term bank credit facilities; however, there were letters of credit outstanding under such facilities of $80 million and $189 million, respectively, for which we are charged letter of credit issuance fees. The uncommitted credit facilities have no commitment fees or compensating balance requirements.
	Bank Debt
	On March 20, 2013, in anticipation of the separation of our retail business as described in Note 3, CST entered into an $800 million senior secured credit agreement. This credit agreement was 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.
	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 liquidating our retained interest in CST. This liquidation was completed on November 14, 2013 by transferring all remaining shares of CST common stock owned by us to the financial institution in exchange for $467 million of our short-term debt, and we paid the remaining $58 million of short-term debt in cash. After paying $19 million of fees, we recognized a $325 million nontaxable gain.
	Non-Bank Debt
	In February 2015, we made a scheduled debt repayment of $400 million related to our 4.5% senior notes.
	During the year ended December 31, 2014, we made a scheduled debt repayment of $200 million related to our 4.75% senior notes.
	During the year ended December 31, 2013, we made scheduled debt repayments of $180 million related to our 6.7% senior notes and $300 million related to our 4.75% senior notes.
	During the year ended December 31, 2012,
	•	we redeemed 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 for $108 million, or 100% of their outstanding stated values;
	•	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
	•	we received proceeds of $300 million from the remarketing of 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.
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 2014, we amended this facility to extend the maturity date to July 2015. 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.
As of December 31, 2014 and 2013, $1.7 billion and $3.3 billion, respectively, of our accounts receivable composed the designated pool of accounts receivable included in the program. All amounts outstanding under the accounts receivable sales facility are reflected as debt on our balance sheets and proceeds and repayments are reflected as cash flows from financing activities on the statements of cash flows. Changes in the amounts outstanding under our accounts receivable sales facility were as follows (in millions):
	Year Ended December 31,
	2014				2013				2012
Balance as of beginning of year	$	100			$	100			$	250
Proceeds from the sale of receivables	—				—				1,500
Repayments	—				—				(1,650		)
Balance as of end of year	$	100			$	100			$	100
Capitalized Interest
For the years ended December 31, 2014, 2013, and 2012, capitalized interest was $70 million, $118 million, and $220 million, respectively.
Other Disclosures
In addition to the maximum debt-to-capitalization ratio applicable to the Revolver discussed above under “Credit Facilities,” our bank credit facilities and other debt arrangements contain various customary restrictive covenants, including cross-default and cross-acceleration clauses.
Principal payments on our debt obligations and future minimum rentals on capital lease obligations as of December 31, 2014 were as follows (in millions):
	Debt				Capital
					Lease
					Obligations
2015	$	601			$	8
2016	—				8
2017	950				6
2018	—				6
2019	750				6
Thereafter	4,074				18
Net unamortized discount	(21		)		1
and fair value adjustments
Less interest expense	—				(21		)
Total	$	6,354			$	32

Commitments_and_Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
COMMITMENTS AND CONTINGENCIES
	12	COMMITMENTS AND CONTINGENCIES
	Operating Leases
	We have long-term operating lease commitments for land, office facilities and equipment, transportation equipment, time charters for ocean-going tankers and coastal vessels, dock facilities, and various facilities and equipment used in the storage, transportation, production, and sale of refinery feedstock, refined product and corn inventories.
	Certain leases for processing equipment and feedstock and refined product storage facilities provide for various contingent payments based on, among other things, throughput volumes in excess of a base amount. Certain leases for vessels contain renewal options and escalation clauses, which vary by charter, and provisions for the payment of chartering fees, which either vary based on usage or provide for payments, in addition to established minimums, that are contingent on usage. In most cases, we expect that in the normal course of business, our leases will be renewed or replaced by other leases.
	As of December 31, 2014, our future minimum rentals and minimum rentals to be received under subleases for leases having initial or remaining noncancelable lease terms in excess of one year were as follows (in millions):
	2015	$	314
	2016	229
	2017	159
	2018	131
	2019	75
	Thereafter	275
	Total minimum rental payments	$	1,183
	Minimum rentals to be received	$	14
	under subleases
	Rental expense was as follows (in millions):
		Year Ended December 31,
		2014		2013		2012
	Minimum rental expense	$	618	$	588	$	512
	Contingent rental expense	43		47		67
	Total rental expense	661		635		579
	Less sublease rental income	—		—		(2		)
	Net rental expense	$	661	$	635	$	577
	Purchase Obligations
	We have various purchase obligations under certain industrial gas and chemical supply arrangements (such as hydrogen supply arrangements), crude oil and other feedstock supply arrangements, and various throughput and terminalling agreements. We enter into these contracts to ensure an adequate supply of utilities and feedstock and adequate storage capacity to operate our refineries. Substantially all of our purchase obligations are based on market prices or adjustments based on market indices. Certain of these purchase obligations include fixed or minimum volume requirements, while others are based on our usage requirements. None of these obligations are associated with suppliers’ financing arrangements. These purchase obligations are not reflected as liabilities.
	Environmental Matters
	Hartford Matters
	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. We have been conducting initial mitigation and cleanup with other companies pursuant to an administrative order issued by the U.S. Environmental Protection Agency (EPA). The U.S. EPA is seeking further cleanup obligations from us and other potentially responsible parties (PRPs) for the Village. In parallel with the Village cleanup, we are in litigation with the Illinois EPA and other PRPs 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 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.
	Regulation of Greenhouse Gases
	The U.S. EPA began regulating greenhouse gases (GHG) on January 2, 2011, under the Clean Air Act Amendments of 1990 (Clean Air Act). The U.S. EPA is developing refinery-specific GHG regulations and performance standards that are expected to impose GHG emission limits and/or technology requirements on new and modified operations. These control requirements may affect a wide range of refinery operations but have not yet been delineated. Any such controls, however, could result in material increased compliance costs, additional operating restrictions for our business, and an increase in the cost of the products we produce, which could have a material adverse effect on our financial position, results of operations, and liquidity.
	Certain states and foreign governments have pursued regulation of GHG independent of the U.S. EPA. For example, the California Global Warming Solutions Act, also known as AB 32, directs the California Air Resources Board (CARB) to develop and issue regulations to reduce GHG emissions in California to 1990 levels by 2020. CARB has issued a variety of regulations aimed at reaching this goal, including a Low Carbon Fuel Standard (LCFS) as well as a statewide cap-and-trade program. The cap-and-trade program costs are expected to increase significantly beginning in 2015 with the inclusion of transportation fuels in the program. Complying with AB 32, including the LCFS and the cap-and-trade program, could result in material increased compliance costs for us, increased capital expenditures, increased operating costs, and additional operating restrictions for our business, resulting in an increase in the cost of, and decreases in the demand for, the products we produce. To the degree we are unable to recover these increased compliance costs, these matters could have a material adverse effect on our financial position, results of operations, and liquidity.
	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, results of operations, or liquidity.
	Tax Matters
	General
	We are subject to extensive tax liabilities imposed by multiple jurisdictions, including income taxes, indirect taxes (excise/duty, sales/use, gross receipts, and value-added taxes), payroll taxes, franchise taxes, withholding taxes, and ad valorem taxes. New tax laws and regulations and changes in existing tax laws and regulations are continuously being enacted or proposed that could result in increased expenditures for tax liabilities in the future. Many of these liabilities are subject to periodic audits by the respective taxing authority. Subsequent changes to our tax liabilities as a result of these audits may subject us to interest and penalties.
	IRS Audits
	As of December 31, 2014, the Internal Revenue Service (IRS) has ongoing tax audits related to our U.S. federal tax returns from 2004 through 2011, as discussed in Note 16. We have received Revenue Agent Reports on our tax years for 2004 through 2009 and we are vigorously contesting many of the tax positions and assertions from the IRS. We are continuing to work with the IRS to resolve these matters and we believe that they will be resolved for amounts consistent with the recorded amounts of unrecognized tax benefits associated with these matters. During the year ended December 31, 2014, we settled the audit related to our 2002 and 2003 tax years and the audit related to a group of our subsidiaries for their 2004 and 2005 tax years consistent with the recorded amounts of uncertain tax position liabilities associated with those audits.
	Self-Insurance
	We are self-insured for certain medical and dental, workers’ compensation, automobile liability, general liability, and property liability claims up to applicable retention limits. Liabilities are accrued for self-insured claims, or when estimated losses exceed coverage limits, and when sufficient information is available to reasonably estimate the amount of the loss. These liabilities are included in accrued expenses and other long-term liabilities.

Equity

Equity	12 Months Ended
	Dec. 31, 2014
Equity [Abstract]
EQUITY
	13	EQUITY
	Share Activity
	For the years ended December 31, 2014, 2013, and 2012, activity in the number of shares of common stock and treasury stock was as follows (in millions):
		Common			Treasury
		Stock			Stock
	Balance as of December 31, 2011	673			(117	)
	Transactions in connection with
	stock-based compensation plans:
	Stock issuances	—			6
	Stock repurchases	—			(6	)
	Stock repurchases under buyback	—			(4	)
	program
	Balance as of December 31, 2012	673			(121	)
	Transactions in connection with
	stock-based compensation plans:
	Stock issuances	—			6
	Stock repurchases	—			(6	)
	Stock repurchases under buyback	—			(17	)
	program
	Balance as of December 31, 2013	673			(138	)
	Transactions in connection with
	stock-based compensation plans:
	Stock issuances	—			4
	Stock repurchases	—			(2	)
	Stock repurchases under buyback	—			(23	)
	program
	Balance as of December 31, 2014	673			(159	)
	Preferred Stock
	We have 20 million shares of preferred stock authorized with a par value of $0.01 per share. No shares of preferred stock were outstanding as of December 31, 2014 or 2013.
	Treasury Stock
	We purchase shares of our common stock in open market transactions to meet our obligations under employee stock-based compensation plans. We also purchase shares of our common stock from our employees and non-employee directors in connection with the exercise of stock options, the vesting of restricted stock, and other stock compensation transactions.
	On February 28, 2008, our board of directors approved a $3 billion common stock purchase program, which was in addition to a $6 billion program previously authorized. This additional $3 billion program has no expiration date. During 2013, we completed the $6 billion program. During the years ended December 31, 2014, 2013, and 2012, we purchased $1.2 billion, $692 million, and $118 million, respectively, of our common stock under our programs. As of December 31, 2014, we have approvals under the $3 billion program to purchase approximately $1.5 billion of our common stock. Year to date through February 20, 2015, we have purchased one million shares for $57 million.
	Common Stock Dividends
	On January 23, 2015, our board of directors declared a quarterly cash dividend of $0.40 per common share payable March 3, 2015 to holders of record at the close of business on February 11, 2015.
	Income Tax Effects Related to Components of Other Comprehensive Income (Loss)
	The following table reflects the tax effects allocated to each component of other comprehensive income (loss) for the years ended December 31, 2014, 2013, and 2012 (in millions):
		Before-Tax				Tax Expense				Net Amount
		Amount				(Benefit)
	Year Ended December 31, 2014:
	Foreign currency translation adjustment	$	(407	)		$	—			$	(407	)
	Pension and other postretirement benefits:
	Loss arising during the year related to:
	Net actuarial loss	(471		)		(162		)		(309		)
	Prior service cost	(1		)		(1		)		—
	(Gain) loss reclassified into income related to:
	Net actuarial loss	34				12				22
	Prior service credit	(40		)		(14		)		(26		)
	Curtailment and settlement	3				—				3
	Net loss on pension and other	(475		)		(165		)		(310		)
	postretirement benefits
	Derivative instruments designated and
	qualifying as cash flow hedges:
	Net loss arising during the year	(1		)		—				(1		)
	Net loss reclassified into income	2				1				1
	Net gain on cash flow hedges	1				1				—
	Other comprehensive loss	$	(881	)		$	(164	)		$	(717	)
		Before-Tax				Tax Expense				Net Amount
		Amount				(Benefit)
	Year Ended December 31, 2013:
	Foreign currency translation adjustment	$	(98	)		$	—			$	(98	)
	Pension and other postretirement benefits:
	Gain arising during the year related to:
	Net actuarial gain	367				125				242
Plan amendments	371				130				241
(Gain) loss reclassified into income related to:
Net actuarial loss	57				20				37
Prior service credit	(33		)		(12		)		(21		)
Settlement	1				—				1
Net gain on pension and other	763				263				500
postretirement benefits
Derivative instruments designated and
qualifying as cash flow hedges:
Net loss arising during the year	(4		)		(2		)		(2		)
Net loss reclassified into income	2				1				1
Net loss on cash flow hedges	(2		)		(1		)		(1		)
Other comprehensive income	$	663			$	262			$	401
Year Ended December 31, 2012:
Foreign currency translation adjustment	$	164			$	—			$	164
Pension and other postretirement benefits:
Loss arising during the year related to:
Net actuarial loss	(228		)		(79		)		(149		)
Prior service cost	(9		)		(3		)		(6		)
(Gain) loss reclassified into income related to:
Net actuarial loss	34				12				22
Prior service credit	(20		)		(7		)		(13		)
Settlement	12				—				12
Net loss on pension and other	(211		)		(77		)		(134		)
postretirement benefits
Derivative instruments designated and
qualifying as cash flow hedges:
Net gain arising during the year	45				16				29
Net gain reclassified into income	(73		)		(26		)		(47		)
Net loss on cash flow hedges	(28		)		(10		)		(18		)
Other comprehensive income (loss)	$	(75	)		$	(87	)		$	12
Accumulated Other Comprehensive Income (Loss)
Changes in accumulated other comprehensive income (loss) by component, net of tax, were as follows (in millions):
	Foreign				Defined				Gains and			Total
	Currency				Benefit				(Losses) on
	Translation				Plan				Cash Flow
	Adjustment				Items				Hedges
Balance as of December 31, 2011	$	501			$	(424	)		$	19		$	96
Other comprehensive income (loss)	164				(134		)		(18		)	12
Balance as of December 31, 2012	665				(558		)		1			108
Other comprehensive income (loss)	(98		)		483				(2		)	383
before reclassifications
Amounts reclassified from	—				17				1			18
accumulated other comprehensive
income (loss)
Net other comprehensive income (loss)	(98		)		500				(1		)	401
Separation of retail business	(159		)		—				—			(159		)
Balance as of December 31, 2013	408				(58		)		—			350
Other comprehensive loss	(407		)		(309		)		(1		)	(717		)
before reclassifications
Amounts reclassified from	—				(1		)		1			—
accumulated other comprehensive
income (loss)
Net other comprehensive loss	(407		)		(310		)		—			(717		)
Balance as of December 31, 2014	$	1			$	(368	)		$	—		$	(367	)
Gains (losses) reclassified out of accumulated other comprehensive income (loss) and into net income were as follows (in millions):
Details about										Affected Line
Accumulated Other										Item in the
Comprehensive Income		Year Ended December 31,								Statement of
(Loss) Components		2014				2013				Income
Amortization of items related to
defined benefit pension plans:
Net actuarial loss		$	(34	)		$	(57	)		(a)
Prior service credit		40				33				(a)
Curtailment and settlement		(3		)		(1		)		(a)
		3				(25		)		Total before tax
		(2		)		8				Tax (expense) benefit
		$	1			$	(17	)		Net of tax
Losses on cash flow hedges:
Commodity contracts		$	(2	)		$	(2	)		Cost of sales
		(2		)		(2		)		Total before tax
		1				1				Tax benefit
		$	(1	)		$	(1	)		Net of tax
Total reclassifications for the year		$	—			$	(18	)		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 14. Net periodic benefit cost is reflected in operating expenses and general and administrative expenses.

Employee_Benefit_Plans

Employee Benefit Plans	12 Months Ended
	Dec. 31, 2014
Compensation and Retirement Disclosure [Abstract]
EMPLOYEE BENEFIT PLANS
	14	EMPLOYEE BENEFIT PLANS
	Defined Benefit Plans
	We have defined benefit pension plans, some of which are subject to collective bargaining agreements, that cover most of our employees. These plans provide eligible employees with retirement income based primarily on years of service and compensation during specific periods under final average pay and cash balance formulas. We fund our pension plans as required by local regulations. In the U.S., all qualified pension plans are subject to the Employee Retirement Income Security Act (ERISA) minimum funding standard. We typically do not fund or fully fund U.S. nonqualified and certain international pension plans that are not subject to funding requirements because contributions to these pension plans may be less economic and investment returns may be less attractive than our other investment alternatives.
	In February 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 changed from a final average pay formula to a cash balance formula with staged effective dates that commenced either on July 1, 2013 or January 1, 2015 depending on the age and service of the affected employees. All final average pay benefits were 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 year ended December 31, 2013. The benefit of this remeasurement will be amortized into income through 2025.
	We also provide health care and life insurance benefits for certain retired employees through our postretirement benefit plans. Most of our employees become eligible for these benefits if, while still working for us, they reach normal retirement age or take early retirement. These plans are unfunded, and retired employees share the cost with us. Individuals who became our employees as a result of an acquisition became eligible for other postretirement benefits under our plans as determined by the terms of the relevant acquisition agreement.
	In October 2013, we announced changes to our U.S. retiree health care plans to utilize more efficient insurance products for Medicare eligible retirees. These plan changes resulted in a $43 million decrease to our benefit obligations for other postretirement benefit plans and a related increase to other comprehensive income during the year ended December 31, 2013.
	The changes in benefit obligation related to all of our defined benefit plans, the changes in fair value of plan assets(a), and the funded status of our defined benefit plans as of and for the years ended were as follows (in millions):
		Pension Plans								Other Postretirement
										Benefit Plans
		December 31,								December 31,
		2014				2013				2014			2013
	Changes in benefit obligation:
	Benefit obligation as of beginning of year	$	1,914			$	2,307			$	324		$	436
	Service cost	120				137				7			12
	Interest cost	91				86				15			18
	Participant contributions	—				—				7			15
	Plan amendments	2				(274		)		—			(43		)
	Curtailment gain	—				(6		)		—			—
	Benefits paid	(109		)		(170		)		(30		)	(37		)
	Actuarial (gain) loss	440				(169		)		37			(77		)
	Other	(8		)		3				1			—
	Benefit obligation as of end of year	$	2,450			$	1,914			$	361		$	324
	Changes in plan assets(a):
	Fair value of plan assets as of beginning of year	$	1,909			$	1,729			$	—		$	—
	Actual return on plan assets	139				306				—			—
	Valero contributions	46				41				20			19
	Participant contributions	—				—				7			15
	Benefits paid	(109		)		(170		)		(30		)	(37		)
	Other	(7		)		3				3			3
	Fair value of plan assets as of end of year	$	1,978			$	1,909			$	—		$	—
	Reconciliation of funded status(a):
	Fair value of plan assets as of end of year	$	1,978			$	1,909			$	—		$	—
	Less benefit obligation as of end of year	2,450				1,914				361			324
	Funded status as of end of year	$	(472	)		$	(5	)		$	(361	)	$	(324	)
	Accumulated benefit obligation	$	2,354			$	1,811			n/a			n/a
	___________________________
	(a)	Plan assets include only the assets associated with pension plans subject to legal minimum funding standards. Plan assets associated with U.S. nonqualified pension plans are not included here because they are not protected from our creditors and therefore cannot be reflected as a reduction from our obligations under the pension plans. As a result, the reconciliation of funded status does not reflect the effect of plan assets that exist for all of our defined benefit plans. See Note 20 for the assets associated with certain U.S. nonqualified pension plans.
	For the year ended December 31, 2014, the funded status of our pension and other postretirement benefit plans were negatively impacted by a combined actuarial loss of $477 million primarily due to approximately $300 million related to the change in the discount rates of our pension plans to 4.10% from 4.92% and our other postretirement benefit plans to 4.13% from 4.88% as of December 31, 2014 and 2013, respectively, and approximately $100 million related to our adoption of the updated mortality table that reflects longer life expectancies.
	Amounts recognized in our balance sheet for our pension and other postretirement benefits plans as of December 31, 2014 and 2013 include (in millions):
		Pension Plans								Other Postretirement
										Benefit Plans
		2014				2013				2014			2013
	Deferred charges and other assets, net	$	7			$	208			$	—		$	—
	Accrued expenses	(28		)		(11		)		(20		)	(19		)
	Other long-term liabilities	(451		)		(202		)		(341		)	(305		)
		$	(472	)		$	(5	)		$	(361	)	$	(324	)
	The accumulated benefit obligations for certain of our pension plans exceed the fair values of the assets of those plans. For those plans, the table below presents the total projected benefit obligation, accumulated benefit obligation, and fair value of the plan assets (in millions).
		December 31,
		2014				2013
	Projected benefit obligation	$	2,288			$	215
	Accumulated benefit obligation	2,217				168
	Fair value of plan assets	1,812				3
	Benefit payments that we expect to pay, including amounts related to expected future services, and the anticipated Medicare subsidies that we expect to receive are as follows for the years ending December 31 (in millions):
		Pension				Other
		Benefits				Postretirement
						Benefits
	2015	$	131			$	20
	2016	127				20
	2017	132				21
	2018	142				21
	2019	189				21
	2020-2024	845				108
	We plan to contribute approximately $47 million to our pension plans and $20 million to our other postretirement benefit plans during 2015.
The components of net periodic benefit cost related to our defined benefit plans were as follows (in millions):
	Pension Plans											Other Postretirement
												Benefit Plans
	Year Ended December 31,											Year Ended December 31,
	2014				2013				2012			2014				2013			2012
Components of net periodic
benefit cost:
Service cost	$	120			$	137			$	140		$	7			$	12		$	12
Interest cost	91				86				93			15				18			21
Expected return on plan assets	(133		)		(131		)		(125		)	—				—			—
Amortization of:
Prior service cost (credit)	(22		)		(19		)		3			(18		)		(14		)	(23		)
Net actuarial (gain) loss	35				57				33			(1		)		—			1
Special charges (credits)	3				(5		)		(3		)	—				—			—
Net periodic benefit cost	$	94			$	125			$	141		$	3			$	16		$	11
Amortization of prior service cost (credit) shown in the above table was based on a straight-line amortization of the cost over the average remaining service period of employees expected to receive benefits under each respective plan. Amortization of the net actuarial loss shown in the above table was based on the straight-line amortization of the excess of the unrecognized loss over 10 percent of the greater of the projected benefit obligation or market-related value of plan assets (smoothed asset value) over the average remaining service period of active employees expected to receive benefits under each respective plan.
Pre-tax amounts recognized in other comprehensive income were as follows (in millions):
	Pension Plans											Other Postretirement
												Benefit Plans
	Year Ended December 31,											Year Ended December 31,
	2014				2013				2012			2014				2013			2012
Net gain (loss) arising during
the year:
Net actuarial gain (loss)	$	(434	)		$	290			$	(245	)	$	(37	)		$	77		$	17
Prior service cost	(1		)		—				(9		)	—				—			—
Remeasurement due to plan	—				328				—			—				43			—
amendments
Net (gain) loss reclassified into
income:
Net actuarial (gain) loss	35				57				33			(1		)		—			1
Prior service cost (credit)	(22		)		(19		)		3			(18		)		(14		)	(23		)
Curtailment and settlement loss	3				1				12			—				—			—
Total changes in other	$	(419	)		$	657			$	(206	)	$	(56	)		$	106		$	(5	)
comprehensive income (loss)
The pre-tax amounts in accumulated other comprehensive income as of December 31, 2014 and 2013 that have not yet been recognized as components of net periodic benefit cost were as follows (in millions):
	Pension Plans								Other Postretirement
									Benefit Plans
	2014				2013				2014			2013
Prior service credit	$	(210	)		$	(233	)		$	(92	)	$	(110	)
Net actuarial (gain) loss	876				479				(6		)	(44		)
Total	$	666			$	246			$	(98	)	$	(154	)
The following pre-tax amounts included in accumulated other comprehensive income as of December 31, 2014 are expected to be recognized as components of net periodic benefit cost during the year ending December 31, 2015 (in millions):
	Pension Plans				Other
					Postretirement
					Benefit Plans
Amortization of prior service credit	$	(22	)		$	(18	)
Amortization of net actuarial loss	63				—
Total	$	41			$	(18	)
The weighted-average assumptions used to determine the benefit obligations as of December 31, 2014 and 2013 were as follows:
	Pension Plans						Other
							Postretirement
							Benefit Plans
	2014			2013			2014			2013
Discount rate	4.1	%		4.92	%		4.13	%		4.88	%
Rate of compensation increase	3.78	%		3.81	%		—	%		—	%
The discount rate assumption used to determine the benefit obligations as of December 31, 2014 and 2013 for the majority of our pension plans and other postretirement benefit plans was based on the Aon Hewitt AA Only Above Median yield curve and considered the timing of the projected cash outflows under our plans. This curve was designed by Aon Hewitt to provide a means for plan sponsors to value the liabilities of their pension plans or postretirement benefit plans. It is a hypothetical double-A yield curve represented by a series of annualized individual discount rates with maturities from one-half year to 99 years. Each bond issue underlying the curve is required to have an average rating of double-A when averaging all available ratings by Moody’s Investor Services, Standard and Poor’s Ratings Service, and Fitch Ratings. Only the bonds representing the 50 percent highest yielding issuances among those with average ratings of double-A are included in this yield curve.
We based our December 31, 2014, 2013, and 2012 discount rate assumption on the Aon Hewitt AA Only Above Median yield curve because we believe it is representative of the types of bonds we would use to settle our pension and other postretirement benefit plan liabilities as of those dates. We believe that the yields associated with the bonds used to develop this yield curve reflect the current level of interest rates.
The weighted-average assumptions used to determine the net periodic benefit cost for the years ended December 31, 2014, 2013, and 2012 were as follows:
	Pension Plans									Other Postretirement
										Benefit Plans
	2014			2013			2012			2014		2013			2012
Discount rate	4.92	%		4.33	%		5.08	%		4.88	%	4.19	%		4.97	%
Expected long-term rate of return	7.61	%		7.62	%		7.67	%		—	%	—	%		—	%
on plan assets
Rate of compensation increase	3.81	%		3.73	%		3.68	%		—	%	—	%		—	%
The assumed health care cost trend rates as of December 31, 2014 and 2013 were as follows:
	2014			2013
Health care cost trend rate assumed for the next year	7.36	%		7.39	%
Rate to which the cost trend rate was assumed to decline	5	%		5	%
(the ultimate trend rate)
Year that the rate reaches the ultimate trend rate	2020			2020
Assumed health care cost trend rates impact the amounts reported for retiree health care plans. A one percentage-point change in assumed health care cost trend rates would have the following effects on other postretirement benefits (in millions):
	1% Increase				1% Decrease
Effect on total of service and interest cost components	$	—			$	—
Effect on accumulated postretirement benefit obligation	5				(4		)
The tables below present the fair values of the assets of our pension plans (in millions) as of December 31, 2014 and 2013 by level of the fair value hierarchy. Assets categorized in Level 1 of the hierarchy are measured at fair value using a market approach based on quotations from national securities exchanges. Assets categorized in Level 2 of the hierarchy are measured at net asset value as a practical expedient for fair value. As previously noted, we do not fund or fully fund U.S. nonqualified and certain international pension plans that are not subject to funding requirements, and we do not fund our other postretirement benefit plans.
	Fair Value Measurements Using											Total as of
												December 31,
	Level 1				Level 2				Level 3			2014
Equity securities:
U.S. companies(a)	$	541			$	—			$	—		$	541
International companies	144				—				—			144
Preferred stock	1				1				—			2
Mutual funds:
International growth	119				—				—			119
Index funds(b)	199				—				—			199
Corporate debt instruments	—				263				—			263
Government securities:
U.S. Treasury securities	71				—				—			71
Other government securities	—				100				—			100
Common collective trusts	—				379				—			379
Private fund	—				40				—			40
Insurance contracts	—				18				—			18
Interest and dividends receivable	5				—				—			5
Cash and cash equivalents	75				22				—			97
Total	$	1,155			$	823			$	—		$	1,978
______________________
See notes on page 98.
	Fair Value Measurements Using											Total as of
												December 31,
	Level 1				Level 2				Level 3			2013
Equity securities:
U.S. companies(a)	$	529			$	—			$	—		$	529
International companies	155				—				—			155
Preferred stock	2				1				—			3
Mutual funds:
International growth	131				—				—			131
Index funds(b)	160				—				—			160
Corporate debt instruments	—				260				—			260
Government securities:
U.S. Treasury securities	81				—				—			81
Other government securities	—				79				—			79
Common collective trusts	—				373				—			373
Private fund	—				38				—			38
Insurance contracts	—				17				—			17
Interest and dividends receivable	5				—				—			5
Cash and cash equivalents	72				6				—			78
Total	$	1,135			$	774			$	—		$	1,909
__________________________________
(a)	Equity securities are held in a wide range of industrial sectors, including consumer goods, information technology, healthcare, industrials, and financial services.
(b)	This class includes primarily investments in approximately 60 percent equities and 40 percent bonds.
The investment policies and strategies for the assets of our pension plans incorporate a well-diversified approach that is expected to earn long-term returns from capital appreciation and a growing stream of current income. This approach recognizes that assets are exposed to risk and the market value of the pension plans’ assets may fluctuate from year to year. Risk tolerance is determined based on our financial ability to withstand risk within the investment program and the willingness to accept return volatility. In line with the investment return objective and risk parameters, the pension plans’ mix of assets includes a diversified portfolio of equity and fixed-income investments. As of December 31, 2014, the target allocations for plan assets are 70 percent equity securities and 30 percent fixed income investments. Equity securities include international stocks and a blend of U.S. growth and value stocks of various sizes of capitalization. Fixed income securities include bonds and notes issued by the U.S. government and its agencies, corporate bonds, and mortgage-backed securities. The aggregate asset allocation is reviewed on an annual basis.
The expected long-term rate of return on plan assets is based on a forward-looking expected asset return model. This model derives an expected rate of return based on the target asset allocation of a plan’s assets. The underlying assumptions regarding expected rates of return for each asset class reflect Aon Hewitt’s best expectations for these asset classes. The model reflects the positive effect of periodic rebalancing among diversified asset classes. We select an expected asset return that is supported by this model.
Defined Contribution Plans
We have defined contribution plans that cover most of our employees. Our contributions to these plans are based on employees’ compensation and/or a partial match of employee contributions to the plans. Our contributions to these defined contribution plans were $61 million, $62 million, and $61 million for the years ended December 31, 2014, 2013, and 2012, respectively.

StockBased_Compensation

Stock-Based Compensation	12 Months Ended
	Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
STOCK-BASED COMPENSATION
	15	STOCK-BASED COMPENSATION
	Under our 2011 Omnibus Stock Incentive Plan (the OSIP), various stock and stock-based awards may be granted to employees and non-employee directors. Awards available under the OSIP include options to purchase shares of common stock, performance awards that vest upon the achievement of an objective performance goal, stock appreciation rights, restricted stock that vests over a period determined by our compensation committee, and dividend equivalent rights (DERs). The OSIP was approved by our stockholders on April 28, 2011. As of December 31, 2014, 13,536,081 shares of our common stock remained available to be awarded under the OSIP.
	We also maintain other stock-based compensation plans under which previously granted equity awards remain outstanding. No additional grants may be awarded under these plans.
	The following table reflects activity related to our stock-based compensation arrangements (in millions):
		Year Ended December 31,
		2014			2013				2012
	Stock-based compensation expense	$	60		$	64			$	58
	Tax benefit recognized on stock-based	21			22				20
	compensation expense
	Tax benefit realized for tax deductions	64			66				45
	resulting from exercises and vestings
	Effect of tax deductions in excess of	47			47				27
	recognized stock-based compensation
	expense reported as a financing cash flow
	Each of our stock-based compensation arrangements is discussed below.
	Stock Options
	Under the terms of our various stock-based compensation plans, the exercise price of options granted is not less than the fair market value of our common stock on the date of grant. Stock options become exercisable pursuant to the individual written agreements between the participants and us, usually in three equal annual installments beginning one year after the date of grant, with unexercised options generally expiring seven or ten years from the date of grant.
	The fair value of stock options granted during 2014, 2013, and 2012 were estimated using the Monte Carlo simulation model, as these options contain both a service condition and a market condition in order to be exercised. The expected life of options granted is the period of time from the grant date to the date of expected exercise or other expected settlement. The expected life for each of the years in the table below was calculated using the safe harbor provisions of SEC Staff Accounting Bulletin No. 107 and No. 110 related to share‑based payments. Because the stock options granted in 2012 and later contain a market condition, historical exercise patterns did not provide a reasonable basis for estimating the expected life. Expected volatility is based on closing prices of our common stock for periods corresponding to the expected life of options granted. Expected dividend yield is based on annualized dividends at the date of grant. The risk-free interest rate used is the implied yield currently available from the U.S. Treasury zero‑coupon issues with a remaining term equal to the expected life of the options at the grant date.
	A summary of the weighted-average assumptions used in our fair value measurements is presented in the table below.
		Year Ended December 31,
		2014		2013			2012
	Expected life in years	6		6			6
	Expected volatility	43.21	%	49.63	%		49.11	%
	Expected dividend yield	2.27	%	2.27	%		2.39	%
	Risk-free interest rate	1.74	%	1.77	%		0.85	%
	A summary of the status of our stock option awards is presented in the table below.
		Number of		Weighted-				Weighted-		Aggregate
		Stock		Average				Average		Intrinsic
		Options		Exercise				Remaining		Value
				Price Per				Contractual
				Share				Term
								(in years)		(in millions)
	Outstanding as of January 1, 2014	8,558,093		$	27.88
	Granted	126,095		48.57
	Exercised	(2,564,125	)	18.64
	Expired	(1,449,986	)	66.67
	Forfeited	(856	)	17.68
	Outstanding as of December 31, 2014	4,669,221		21.48				4.5		$	131
	Exercisable as of December 31, 2014	4,315,414		19.99				4.2		127
	The following table reflects activity related to our stock options granted (in millions, except per share data):
		Year Ended December 31,
		2014			2013				2012
	Weighted average grant-date fair value price per share	$	17.31		$	15.83			$	10.98
	Intrinsic value of stock options exercised	85			101				78
	Cash received from stock option exercises	47			59				59
	As of December 31, 2014, there was $1 million of unrecognized compensation cost related to outstanding unvested stock option awards, which is expected to be recognized over a weighted-average period of approximately two years.
	Restricted Stock
	Restricted stock is granted to employees and non-employee directors. Restricted stock granted to employees vests in accordance with individual written agreements between the participants and us, usually in equal annual installments over a period of three years beginning one year after the date of grant. Restricted stock granted to our non-employee directors generally vests in three years following the date of grant. A summary of the status of our restricted stock awards is presented in the table below.
		Number of		Weighted-
		Shares		Average
				Grant-Date
				Fair Value
				Per Share
	Nonvested shares as of January 1, 2014	2,205,314		$	32.23
	Granted	969,671		49.4
	Vested	(1,402,753	)	31.9
	Forfeited	(14,082	)	32.56
	Nonvested shares as of December 31, 2014	1,758,150		41.96
	As of December 31, 2014, there was $45 million of unrecognized compensation cost related to outstanding unvested restricted stock awards, which is expected to be recognized over a weighted-average period of approximately two years. The total fair value of restricted stock that vested during the years ended December 31, 2014, 2013, and 2012 was $60 million, $74 million, and $47 million, respectively.
	Performance Awards
	Performance awards are issued to certain of our key employees and represent rights to receive shares of our common stock upon the achievement by us of an objective performance measure. The objective performance measure is our total shareholder return, which is ranked among the total shareholder returns of a defined peer group of companies. Our ranking determines the rate at which the performance awards convert into our common shares. Conversion rates can range from zero to 200 percent.
	Performance awards vest in equal one-third increments (tranches) on an annual basis. Our compensation committee establishes the peer group of companies for each tranche of awards at the beginning of the one year vesting period for that tranche. Therefore, performance awards are not considered to be granted for accounting purposes until our compensation committee establishes the peer group of companies for each tranche of awards. The fair value of each tranche of awards is determined at the time the awards are considered to be granted and is based on the expected conversion rate for those awards and the fair value per share. The fair value per share for awards granted during 2014 is equal to the market price of our common stock on the grant date as these grants include DERs. The fair value per share for awards granted prior to 2014 was equal to the market price of our common stock on the grant date reduced by expected dividends over that tranche’s vesting period as these grants did not include DERs.
	A summary of the status of our performance awards considered granted is presented below.
	Nonvested		Vested
	Awards		Awards
Awards outstanding as of January 1, 2014	947,165		—
Granted	225,829		—
Vested	(534,028	)	534,028
Converted	—		(534,028	)
Forfeited	(24,576	)	—
Awards outstanding as of December 31, 2014	614,390		—
There were three tranches of performance awards granted during the year ended December 31, 2014 as follows:
	Awards		Expected		Fair Value
	Granted		Conversion		Per Share
			Rate
Third tranche of 2012 awards	99,023		100%		$	47.47
Second tranche of 2013 awards	76,232		100%		47.47
First tranche of 2014 awards	50,574		100%		48.57
Total	225,829
As of December 31, 2014, there was $11 million of unrecognized compensation cost related to outstanding unvested performance awards, which will be recognized during 2015. The total fair value of performance awards that vested during the years ended December 31, 2014, 2013, and 2012 was $15 million, $12 million, and $3 million, respectively.
Performance awards converted during the year ended December 31, 2014 were as follows:
	Vested		Actual		Number of
	Awards		Conversion		Shares
	Converted		Rate		Issued
2010 awards	201,422		100%		201,422
2011 awards	227,571		200%		455,142
2012 awards	102,855		200%		205,710
2013 awards	2,180		200%		4,360
Total	534,028				866,634

Income_Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
INCOME TAXES
	16	INCOME TAXES
	Income Tax Expense
	Income from continuing operations before income tax expense was as follows (in millions):
		Year Ended December 31,
		2014			2013			2012
	U.S. operations	$	4,677		$	3,531		$	4,015
	International operations	875			445			725
	Income from continuing operations before	$	5,552		$	3,976		$	4,740
	income tax expense
	The following is a reconciliation of income tax expense computed by applying the U.S. federal statutory income tax rate (35 percent for all years presented) to actual income tax expense related to continuing operations (in millions):
		Year Ended December 31,
		2014			2013			2012
	Federal income tax expense	$	1,943		$	1,392		$	1,659
	at the U.S. federal statutory rate
	U.S. state income tax expense,	62			62			64
	net of U.S. federal income tax effect
	U.S. manufacturing deduction	(74		)	(36		)	(33		)
	International operations	(88		)	(69		)	(96		)
	Permanent differences	(16		)	(104		)	20
	Change in tax law	—			(32		)	—
	Other, net	(50		)	41			12
	Income tax expense	$	1,777		$	1,254		$	1,626
	The variation in the customary relationship between income tax expense and income from continuing operations before income tax expense for the year ended December 31, 2014 was primarily due to an increase in income from continuing operations from our international operations that was taxed at statutory rates that are lower than in the U.S. and an increase in our U.S. manufacturing deduction. The variation in the customary relationship between income tax expense and income from continuing operations before income tax expense for the year ended December 31, 2013 was primarily due to the $325 million nontaxable gain on the disposition of our retained interest in CST as described in Notes 3 and 11.
	There was no income tax expense or benefit related to discontinued operations for the years ended December 31, 2014, 2013, and 2012.
	Components of income tax expense related to continuing operations were as follows (in millions):
		Year Ended December 31,
		2014			2013			2012
	Current:
	U.S. federal	$	1,196		$	635		$	515
	U.S. state	59			36			22
	International	77			82			126
	Total current	1,332			753			663
	Deferred:
	U.S. federal	268			459			854
	U.S. state	36			59			77
	International	141			(17		)	32
	Total deferred	445			501			963
	Income tax expense	$	1,777		$	1,254		$	1,626
	Deferred Income Tax Assets and Liabilities
	The tax effects of significant temporary differences representing deferred income tax assets and liabilities were as follows (in millions):
		December 31,
		2014			2013
	Deferred income tax assets:
	Tax credit carryforwards	$	37		$	48
	Net operating losses (NOLs)	436			338
	Inventories	160			264
	Property, plant, and equipment	—			8
	Compensation and employee benefit liabilities	358			178
	Environmental liabilities	92			92
	Other	178			187
	Total deferred income tax assets	1,261			1,115
	Less: Valuation allowance	(393		)	(347		)
	Net deferred income tax assets	868			768
	Deferred income tax liabilities:
	Property, plant, and equipment	6,682			6,536
	Deferred turnaround costs	356			331
	Inventories	426			310
	Investments	152			94
	Other	73			81
	Total deferred income tax liabilities	7,689			7,352
	Net deferred income tax liabilities	$	6,821		$	6,584
	We had the following income tax credit and loss carryforwards as of December 31, 2014 (in millions):
		Amount			Expiration
U.S. state income tax credits	$	53		2015 through 2027
U.S. state NOLs (gross amount)	6,574			2015 through 2034
International NOLs	1,630			Unlimited
We have recorded a valuation allowance as of December 31, 2014 and 2013 due to uncertainties related to our ability to utilize some of our deferred income tax assets, primarily consisting of certain U.S. state income tax credits and NOLs, and international NOLs, before they expire. The valuation allowance is based on our estimates of taxable income in the various jurisdictions in which we operate and the period over which deferred income tax assets will be recoverable. During 2014, the valuation allowance increased by $46 million, primarily due to increases in U.S. state NOLs. The realization of net deferred income tax assets recorded as of December 31, 2014 is primarily dependent upon our ability to generate future taxable income in certain U.S. states and international jurisdictions.
Should we ultimately recognize tax benefits related to the valuation allowance for deferred income tax assets as of December 31, 2014, such amounts will be allocated as follows (in millions):
Income tax benefit	$	386
Additional paid-in capital	7
Total	$	393
Deferred income taxes have not been provided on the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and the respective tax bases of our international subsidiaries based on the determination that such differences are essentially permanent in duration in that the earnings of these subsidiaries are expected to be indefinitely reinvested in the international operations. As of December 31, 2014, the cumulative undistributed earnings of these subsidiaries were approximately $2.9 billion. If those earnings were not considered indefinitely reinvested, deferred income taxes would have been recorded after consideration of U.S. foreign tax credits. It is not practicable to estimate the amount of additional tax that might be payable on those earnings, if distributed.
Unrecognized Tax Benefits
The following is a reconciliation of the change in unrecognized tax benefits, excluding related penalties, interest (net of the U.S. federal and state income tax effects), and the U.S. federal income tax effect of state unrecognized tax benefits (in millions):
	Year Ended December 31,
	2014			2013			2012
Balance as of beginning of year	$	950		$	341		$	326
Additions based on tax positions related to the current year	35			64			11
Additions for tax positions related to prior years	118			576			40
Reductions for tax positions related to prior years	(67		)	(26		)	(36		)
Reductions for tax positions related to the lapse of	(1		)	(4		)	—
applicable statute of limitations
Settlements	(46		)	(1		)	—
Balance as of end of year	$	989		$	950		$	341
The reconciliation of the change in unrecognized tax benefits for the year ended December 31, 2013 includes $556 million of additions for tax positions primarily related to prior years for tax refunds that we intend to claim by amending our income tax returns for 2005 through 2012. We intend to propose that incentive payments received from the U.S. federal government for blending biofuels into refined products be excluded from taxable income during these periods. However, due to the complexity of this matter and uncertainties with respect to the interpretation of the Internal Revenue Code, we concluded that the refund claims included in the reconciliation below cannot be recognized in our financial statements. As a result, these amounts are not included in our uncertain tax position liabilities as of December 31, 2014 and 2013, even though they are reflected in the table above.
The following is a reconciliation of unrecognized tax benefits reflected in the table above to our uncertain tax position liabilities as of December 31, 2014 and 2013 that are reflected in Note 10 (in millions):
	December 31,
	2014			2013
Unrecognized tax benefits	$	989		$	950
Tax refund claim not recognized in our financial statements	(554		)	(556		)
Penalties, interest (net of U.S. federal and state income tax	49			49
effect), and the U.S. federal income tax effect of state
unrecognized tax benefits
Uncertain tax position liabilities	$	484		$	443
As of December 31, 2014 and 2013, there were $768 million and $763 million, respectively, of unrecognized tax benefits that if recognized would affect our annual effective tax rate. During the next 12 months, it is reasonably possible that tax audit resolutions could reduce unrecognized tax benefits, excluding interest, by $133 million, either because the tax positions are sustained on audit or because we agree to their disallowance. We do not expect these reductions to have a significant impact on our financial statements because such reductions would not significantly affect our annual effective rate.
Penalties and interest, which are reflected within income tax expense, were immaterial for the year ended December 31, 2014. During the years ended December 31, 2013 and 2012, we recognized $12 million and $23 million, respectively, in penalties and interest. Accrued penalties and interest totaled $141 million and $145 million as of December 31, 2014 and 2013, respectively, excluding the U.S. federal and state income tax effects related to interest.
Tax Returns Under Audit
As of December 31, 2014, our tax years for 2004 through 2011 were under audit by the IRS. The IRS has proposed adjustments to our taxable income for certain open years. We are protesting the proposed adjustments and do not expect that the ultimate disposition of these adjustments will result in a material change to our financial position, results of operations, or liquidity. We are continuing to work with the IRS to resolve these matters and we believe that they will be resolved for amounts consistent with recorded amounts of unrecognized tax benefits associated with these matters.
In December 2014, we paid the final IRS assessment for our tax years 2002 and 2003 and closed the audit related to all proposed adjustments. The amount paid was consistent with the recorded amount of unrecognized tax benefits associated with that audit.

Earnings_Per_Common_Share

Earnings Per Common Share	12 Months Ended
	Dec. 31, 2014
Earnings Per Share [Abstract]
EARNINGS PER COMMON SHARE
	17	EARNINGS PER COMMON SHARE
	Earnings per common share from continuing operations were computed as follows (dollars and shares in millions, except per share amounts):
		Year Ended December 31,
		2014				2013				2012
		Restricted		Common		Restricted		Common		Restricted		Common
		Stock		Stock		Stock		Stock		Stock		Stock
	Earnings per common share
	from continuing operations:
	Net income attributable to			$	3,694			$	2,714			$	3,117
	Valero stockholders from
	continuing operations
	Less dividends paid:
	Common stock			552				460				358
	Nonvested restricted stock			2				2				2
	Undistributed earnings			$	3,140			$	2,252			$	2,757
	Weighted-average common	2		526		3		542		3		550
	shares outstanding
	Earnings per common share
	from continuing operations:
	Distributed earnings	$	1.05	$	1.05	$	0.85	$	0.85	$	0.65	$	0.65
	Undistributed earnings	5.95		5.95		4.13		4.13		4.99		4.99
	Total earnings per common	$	7	$	7	$	4.98	$	4.98	$	5.64	$	5.64
	share from continuing
	operations
	Earnings per common share
	from continuing operations –
	assuming dilution:
	Net income attributable to			$	3,694			$	2,714			$	3,117
	Valero stockholders from
	continuing operations
	Weighted-average common			526				542				550
	shares outstanding
	Common equivalent shares:
	Stock options			2				4				4
	Performance awards and			2				2				2
	nonvested restricted stock
	Weighted-average common			530				548				556
	shares outstanding –
	assuming dilution
	Earnings per common share			$	6.97			$	4.96			$	5.61
	from continuing operations –
	assuming dilution

Segment_Information

Segment Information	12 Months Ended
	Dec. 31, 2014
Segment Reporting [Abstract]
SEGMENT INFORMATION
	18	SEGMENT INFORMATION
	We have two reportable segments, refining and ethanol, as of December 31, 2014. Prior to May 1, 2013, we also had a retail segment. As discussed in Note 3, we completed the separation of our retail business, CST, 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, which were eliminated in consolidation prior to the separation, are reported as refining segment operating revenues from external customers after May 1, 2013.
	Our refining segment includes refining operations, wholesale marketing, product supply and distribution, and transportation operations in the U.S., Canada, the U.K., Aruba, and Ireland. Our ethanol segment primarily includes sales of internally produced ethanol and distillers grains. The retail segment included company-operated convenience stores in the U.S. and Canada; filling stations, truckstop facilities, cardlock facilities, and home heating oil operations in Canada; and credit card operations in the U.S. Operations that are not included in any of the reportable segments are included in the corporate category.
	The reportable segments are strategic business units that offer different products and services. They are managed separately as each business requires unique technology and marketing strategies. Performance is evaluated based on operating income. Intersegment sales are generally derived from transactions made at prevailing market rates.
	The following table reflects activity related to continuing operations (in millions):
		Refining		Ethanol			Retail		Corporate			Total
	Year ended December 31, 2014:
	Operating revenues from external	$	126,004	$	4,840		$	—	$	—		$	130,844
	customers
	Intersegment revenues	—		100			—		—			100
	Depreciation and amortization expense	1,597		49			—		44			1,690
	Operating income (loss)	5,884		786			—		(768		)	5,902
	Total expenditures for long-lived assets	2,750		42			—		30			2,822
	Year ended December 31, 2013:
	Operating revenues from external	129,064		5,114			3,896		—			138,074
	customers
	Intersegment revenues	2,876		128			—		—			3,004
	Depreciation and amortization expense	1,566		45			41		68			1,720
	Operating income (loss)	4,211		491			81		(826		)	3,957
	Total expenditures for long-lived assets	2,597		33			62		65			2,757
	Year ended December 31, 2012:
	Operating revenues from external	122,068		4,317			12,008		—			138,393
	customers
	Intersegment revenues	8,946		115			—		—			9,061
	Depreciation and amortization expense	1,345		42			119		43			1,549
	Operating income (loss)	5,484		(47		)	348		(741		)	5,044
	Total expenditures for long-lived assets	3,147		36			164		66			3,413
	Our principal products include conventional and CARB gasolines, RBOB (reformulated gasoline blendstock for oxygenate blending), ultra-low-sulfur diesel, and gasoline blendstocks. We also produce a substantial slate of middle distillates, jet fuel, and petrochemicals, in addition to lube oils and asphalt. Other product revenues include such products as gas oils, No. 6 fuel oil, and petroleum coke. Operating revenues from external customers for our principal products were as follows (in millions):
		Year Ended December 31,
		2014		2013			2012
	Refining:
	Gasolines and blendstocks	$	56,846	$	57,806		$	55,647
	Distillates	57,521		56,921			51,095
	Petrochemicals	3,759		4,281			3,908
	Lubes and asphalts	1,397		1,643			2,033
	Other product revenues	6,481		8,413			9,385
	Total refining operating revenues	126,004		129,064			122,068
	Ethanol:
	Ethanol	4,192		4,245			3,545
	Distillers grains	648		869			772
	Total ethanol operating revenues	4,840		5,114			4,317
	Retail:
	Fuel sales (gasoline and diesel)	—		3,226			10,045
	Merchandise sales and other	—		524			1,649
	Home heating oil	—		146			314
	Total retail operating revenues	—		3,896			12,008
	Total operating revenues	$	130,844	$	138,074		$	138,393
	Operating revenues by geographic area are shown in the table below (in millions). The geographic area is based on location of customer and no customer accounted for 10 percent or more of our operating revenues.
		Year Ended December 31,
		2014		2013			2012
	U.S.	$	91,499	$	100,418		$	99,879
	Canada	10,410		9,974			10,376
	U.K. and Ireland	14,182		13,675			12,818
	Other countries	14,753		14,007			15,320
	Total operating revenues	$	130,844	$	138,074		$	138,393
	Long-lived assets include property, plant, and equipment and certain long-lived assets included in “deferred charges and other assets, net.” Geographic information by country for long-lived assets consisted of the following (in millions):
		December 31,
		2014		2013
	U.S.	$	24,710	$	23,572
	Canada	2,250		2,260
	U.K.	1,206		1,148
	Aruba	59		53
	Ireland	22		26
Total long-lived assets	$	28,247	$	27,059
Total assets by reportable segment were as follows (in millions):
	December 31,
	2014		2013
Refining	$	40,103	$	41,227
Ethanol	954		889
Corporate	4,493		5,144
Total assets	$	45,550	$	47,260
In March 2014, we purchased an idled corn ethanol plant in Mount Vernon, Indiana for $34 million from a wholly owned subsidiary of Aventine Renewable Energy Holdings, Inc. We resumed production at that plant during the third quarter of 2014. In the fourth quarter of 2014, an independent appraisal of the assets acquired and liabilities assumed and certain other evaluations of the fair values related to the Mount Vernon plant were completed and finalized. The purchase price of the Mount Vernon plant was allocated based on the fair values of the assets acquired and the liabilities assumed at the date of acquisition resulting from this final appraisal and other evaluations. There were no significant adjustments made to the preliminary purchase price allocation.

Supplemental_Cash_Flow_Informa

Supplemental Cash Flow Information	12 Months Ended
	Dec. 31, 2014
Supplemental Cash Flow Information [Abstract]
SUPPLEMENTAL CASH FLOW INFORMATION
	19	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):
		Year Ended December 31,
		2014			2013			2012
	Decrease (increase) in current assets:
	Receivables, net	$	2,753		$	(753	)	$	437
	Inventories	(1,014		)	(13		)	(282		)
	Income taxes receivable	(23		)	10			51
	Prepaid expenses and other	(32		)	2			(28		)
	Increase (decrease) in current liabilities:
	Accounts payable	(3,149		)	977			(113		)
	Accrued expenses	38			53			13
	Taxes other than income taxes	(64		)	337			(260		)
	Income taxes payable	(319		)	309			(120		)
	Changes in current assets and current liabilities	$	(1,810	)	$	922		$	(302	)
	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 year ended December 31, 2013 exclude the change in current assets and current liabilities resulting from the separation of our retail business as described in Note 3;
	•	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 years ended December 31, 2014, 2013 and 2012.
	Noncash financing activities for the year ended December 31, 2013 included the exchange of CST’s senior unsecured bonds and the exchange of all of our remaining shares of CST common stock with third-party financial institutions in satisfaction of our short-term debt agreements as described in Note 11. There were no significant noncash financing activities for the years ended December 31, 2014 and 2012.
	Cash flows related to interest and income taxes paid were as follows (in millions):
		Year Ended December 31,
		2014			2013			2012
	Interest paid in excess of amount capitalized	$	392		$	361		$	302
	Income taxes paid, net	1,624			387			705
	Cash flows related to the discontinued operations of the Aruba Refinery were immaterial for the years ended December 31, 2014, 2013, and 2012.

Fair_Value_Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2014
Fair Value Disclosures [Abstract]
FAIR VALUE MEASUREMENTS
	20	FAIR VALUE MEASUREMENTS
	General
	U.S. GAAP requires or permits certain assets and liabilities to be measured at fair value on a recurring or nonrecurring basis in our balance sheets, and those assets and liabilities are presented below under “Recurring Fair Value Measurements” and “Nonrecurring Fair Value Measurements.” Assets and liabilities measured at fair value on a recurring basis, such as derivative financial instruments, are measured at fair value at the end of each reporting period. Assets and liabilities measured at fair value on a nonrecurring basis, such as the impairment of property, plant and equipment, are measured at fair value in particular circumstances.
	U.S. 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.”
	U.S. 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 December 31, 2014 and 2013.
	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.
		31-Dec-14
								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	$	3,096	$	36	$	—	$	3,132	$	(2,907	)	$	(99	)	$	126	$	—
	contracts
	Physical purchase	—		1		—		1		n/a			n/a			1		n/a
	contracts
	Investments of certain	97		—		11		108		n/a			n/a			108		n/a
	benefit plans
	Total	$	3,193	$	37	$	11	$	3,241	$	(2,907	)	$	(99	)	$	235
	Liabilities:
	Commodity derivative	$	2,886	$	34	$	—	$	2,920	$	(2,907	)	$	(13	)	$	—	$	(25	)
	contracts
	Biofuels blending	—		14		—		14		n/a			n/a			14		n/a
	obligation
	Physical purchase	—		5		—		5		n/a			n/a			5		n/a
	contracts
	Total	$	2,886	$	53	$	—	$	2,939	$	(2,907	)	$	(13	)	$	19
		December 31, 2013
								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	$	499	$	38	$	—	$	537	$	(505	)	$	(7	)	$	25	$	—
	contracts
	Investments of certain	98		—		11		109		n/a			n/a			109		n/a
	benefit plans
	Total	$	597	$	38	$	11	$	646	$	(505	)	$	(7	)	$	134
	Liabilities:
	Commodity derivative	$	492	$	24	$	—	$	516	$	(505	)	$	(6	)	$	5	$	(76	)
	contracts
	Biofuels blending	—		11		—		11		n/a			n/a			11		n/a
	obligation
	Physical purchase	—		5		—		5		n/a			n/a			5		n/a
	contracts
	Foreign currency	8		—		—		8		n/a			n/a			8		n/a
	contracts
	Total	$	500	$	40	$	—	$	540	$	(505	)	$	(6	)	$	29
	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 21, 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 21, 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 for 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 21 under “Compliance Program Price 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 December 31, 2014 and 2013 that were measured at fair value on a recurring basis.
	There was no activity during the years ended December 31, 2014, 2013, and 2012 related to the fair value amounts categorized in Level 3 as of December 31, 2014, 2013, and 2012.
Nonrecurring Fair Value Measurements
There were no assets or liabilities that were measured at fair value on a nonrecurring basis as of December 31, 2014 and 2013.
Other Financial Instruments
Financial instruments that we recognize in our balance sheets at their carrying amounts are shown in the table below (in millions):
	December 31, 2014				December 31, 2013
	Carrying		Fair		Carrying		Fair
	Amount		Value		Amount		Value
Financial assets:
Cash and temporary cash investments	$	3,689	$	3,689	$	4,292	$	4,292
Financial liabilities:
Debt (excluding capital leases)	6,354		7,562		6,525		7,659
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 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	12 Months Ended
	Dec. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]
PRICE RISK MANAGEMENT ACTIVITIES
	21	PRICE RISK MANAGEMENT ACTIVITIES
	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 20), 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 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 December 31, 2014, we had no outstanding commodity derivative instruments that were entered into as fair value hedges.
	•	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 December 31, 2014, we had no outstanding commodity derivative instruments that were entered into as cash flow hedges.
	•	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) feedstock and refined product inventories, (ii) forecasted feedstock and product purchases, and product sales, and (iii) fixed-price 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 December 31, 2014, we had the following outstanding commodity derivative instruments that were used as economic hedges, as well as 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		2015			2016
	Crude oil and refined products:
	Swaps – long		7,532			—
	Swaps – short		5,676			—
	Futures – long		46,886			—
	Futures – short		67,600			—
	Natural gas:
	Options – long		1,250			—
	Corn:
	Futures – long		20,815			80
	Futures – short		46,585			1,155
	Physical contracts – long		25,327			1,081
	Soybean oil:
	Futures – long		94,920			—
	Futures – short		178,920			—
	•	Trading Derivatives – Our objective for entering into commodity derivative instruments for trading purposes is to take advantage of existing market conditions related to future results of operations and cash flows.
	As of December 31, 2014, we had the following outstanding commodity 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).
			Notional Contract Volumes by
			Year of Maturity
	Derivative Instrument		2015			2016
	Crude oil and refined products:
	Swaps – long		645			—
	Swaps – short		645			—
	Futures – long		95,709			5,116
	Futures – short		96,897			4,341
	Options – long		1,900			—
	Options – short		1,200			—
	Natural gas:
	Futures – long		6,200			—
	Futures – short		4,200			—
	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 December 31, 2014 and 2013, or during the years ended December 31, 2014, 2013, or 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 these 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 December 31, 2014, we had commitments to purchase $377 million of U.S. dollars. These commitments matured on or before January 31, 2015 resulting in a gain of $12 million in the first quarter of 2015.
	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. For the years ended December 31, 2014, 2013, and 2012, the cost of meeting our obligations under these compliance programs was $372 million, $517 million, and $250 million, 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 December 31, 2014 and 2013 (in millions) and the line items in the balance sheets in which the fair values are reflected. See Note 20 for additional information related to the fair values of our derivative instruments.
	As indicated in Note 20, 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		December 31, 2014
		Location		Asset				Liability
				Derivatives				Derivatives
	Derivatives not designated as
	hedging instruments
	Commodity contracts:
	Futures	Receivables, net		$	3,096			$	2,886
	Swaps	Receivables, net		34				31
	Options	Receivables, net		2				3
	Physical purchase contracts	Inventories		1				5
Total			$	3,133			$	2,925
	Balance Sheet		31-Dec-13
	Location		Asset				Liability
			Derivatives				Derivatives
Derivatives designated as
hedging instruments
Commodity contracts:
Futures	Receivables, net		$	25			$	36
Derivatives not designated as
hedging instruments
Commodity contracts:
Futures	Receivables, net		$	474			$	455
Swaps	Receivables, net		33				18
Swaps	Prepaid expenses and other		3				—
Swaps	Accrued expenses		—				5
Options	Receivables, net		2				2
Physical purchase contracts	Inventories		—				5
Foreign currency contracts	Accrued expenses		—				8
Total			$	512			$	493
Total derivatives			$	537			$	529
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. 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 (OCI) 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)		Year Ended December 31,
Hedging Relationships		Recognized in Income
		on Derivatives		2014				2013			2012
Commodity contracts:
Loss recognized in		Cost of sales		$	(42	)		$	(12	)	$	(250	)
income on derivatives
Gain recognized in		Cost of sales		42				18			183
income on hedged item
Gain (loss) recognized in		Cost of sales		—				6			(67		)
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 years ended December 31, 2014, 2013, and 2012. There were no amounts recognized in income for hedged firm commitments that no longer qualified as fair value hedges during the years ended December 31, 2014 and 2013; however, a gain of $28 million was recognized in income during the year ended December 31, 2012 for hedged firm commitments that no longer qualified as fair value hedges.
Derivatives in Cash Flow		Location of Gain (Loss)		Year Ended December 31,
Hedging Relationships		Recognized in Income
		on Derivatives		2014				2013			2012
Commodity contracts:
Gain (loss) recognized in				$	(1	)		$	(4	)	$	45
OCI on derivatives
(effective portion)
Gain (loss) reclassified from		Cost of sales		(2		)		(2		)	73
accumulated OCI into
income (effective portion)
Gain (loss) recognized in		Cost of sales		(1		)		21			48
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 years ended December 31, 2014, 2013, and 2012. For the year ended December 31, 2014, cash flow hedges primarily related to forward purchases of crude oil, with no cumulative after-tax gains or losses on cash flow hedges remaining in accumulated other comprehensive income. For the years ended December 31, 2014, 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)		Year Ended December 31,
Economic Hedges and Other		Recognized in Income
Derivative Instruments		on Derivatives		2014				2013			2012
Commodity contracts		Cost of sales		$	693			$	193		$	1
Foreign currency contracts		Cost of sales		40				14			(38		)
Trading Derivatives		Location of Gain (Loss)		Year Ended December 31,
		Recognized in Income
		on Derivatives		2014				2013			2012
Commodity contracts		Cost of sales		$	38			$	21		$	(16	)
RINs fixed-price contracts		Cost of sales		—				(20		)	—

Quarterly_Financial_Data_Unaud

Quarterly Financial Data (Unaudited)	12 Months Ended
	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
QUARTERLY FINANCIAL DATA (Unaudited)
	22	QUARTERLY FINANCIAL DATA (Unaudited)
	The following table summarizes quarterly financial data for the years ended December 31, 2014 and 2013 (in millions, except per share amounts). The amounts shown below differ from those previously reported in our quarterly reports on Form 10-Q for the quarters ended March 31, 2013 and 2014 due to the abandonment of the Aruba Refinery in May 2014 as discussed in Note 2. The results of operations of the Aruba Refinery have been presented as discontinued operations for all periods presented.
		2014 Quarter Ended
		31-Mar		30-Jun		30-Sep		31-Dec
	Operating revenues	$	33,663	$	34,914	$	34,408	$	27,859
	Operating income	1,351		1,085		1,670		1,796
	Net income	836		593		1,062		1,220
	Net income attributable to	828		588		1,059		1,155
	Valero Energy Corporation
	stockholders
	Earnings per common share	1.55		1.11		2.01		2.22
	Earnings per common share –	1.54		1.1		2		2.22
	assuming dilution
		2013 Quarter Ended
		31-Mar		June 30 (a)		30-Sep		31-Dec
	Operating revenues	33,474		34,034		36,137		34,429
	Operating income	1,058		805		532		1,562
	Net income	652		465		324		1,287
	Net income attributable to	654		466		312		1,288
	Valero Energy Corporation
	stockholders
	Earnings per common share	1.18		0.86		0.58		2.39
	Earnings per common share –	1.18		0.85		0.57		2.38
	assuming dilution
	____________________
	(a)	The separation of our retail business was completed on May 1, 2013.

Basis_of_Presentation_and_Summ1

Basis of Presentation and Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation
	General
	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. We are an independent petroleum refining and marketing company and own 15 refineries with a combined throughput capacity of approximately 2.9 million barrels per day as of December 31, 2014. We market branded and unbranded refined products on a wholesale basis in the United States (U.S.), Canada, the Caribbean, the United Kingdom (U.K.), and Ireland through an extensive bulk and rack marketing network and through approximately 7,400 outlets that carry the Valero®, Shamrock®, Ultramar®, Beacon®, and Texaco® brand names. We also own 11 ethanol plants in the U.S. that primarily produce ethanol with a combined production capacity of approximately 1.3 billion gallons per year as of December 31, 2014. Our operations are affected by:
	•	company-specific factors, primarily refinery utilization rates and refinery maintenance turnarounds;
	•	seasonal factors, such as the demand for refined products during the summer driving season and heating oil during the winter season; and
	•	industry factors, such as movements in and the level of crude oil prices including the effect of quality differentials between grades of crude oil, the demand for and prices of refined products, industry supply capacity, and competitor refinery maintenance turnarounds.
Reclassifications	Reclassifications
	Certain amounts reported as of and for the year ended December 31, 2013 have been reclassified to conform to the 2014 presentation. As discussed in Note 2, in May 2014, we abandoned the Aruba Refinery. As a result, the refinery’s results of operations have been presented as discontinued operations in the consolidated statements of income for all years presented.
Principles of Consolidation	Principles of Consolidation
	These financial statements include the accounts of Valero, and subsidiaries and entities in which Valero has a controlling financial interest. The ownership of noncontrolling investors are recorded as noncontrolling interests. Intercompany balances and transactions have been eliminated in consolidation. Investments in significant noncontrolled entities are accounted for using the equity method.
Use of Estimates	Use of Estimates
	The preparation of financial statements in conformity with U.S. generally accepted accounting principles (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.
Cash and Temporary Cash Investments	Cash and Temporary Cash Investments
	Our temporary cash investments are highly liquid, low-risk debt instruments that have a maturity of three months or less when acquired.
Receivables	Receivables
	Trade receivables are carried at original invoice amount. We maintain an allowance for doubtful accounts, which is adjusted based on management’s assessment of our customers’ historical collection experience, known credit risks, and industry and economic conditions.
Inventories	Inventories
	Inventories are carried at the lower of cost or market. The cost of refinery feedstocks purchased for processing, refined products, and grain and ethanol inventories are determined under the last-in, first-out (LIFO) method using the dollar-value LIFO method, with any increments valued based on average purchase prices during the year. The cost of feedstocks and products purchased for resale and the cost of materials and supplies are determined principally under the weighted-average cost method.
Property, Plant, and Equipment	Property, Plant, and Equipment
	The cost of property, plant, and equipment (property assets) purchased or constructed, including betterments of property assets, is capitalized. However, the cost of repairs to and normal maintenance of property assets is expensed as incurred. Betterments of property assets are those that extend the useful life, increase the capacity or improve the operating efficiency of the asset, or improve the safety of our operations. The cost of property assets constructed includes interest and certain overhead costs allocable to the construction activities.
	Our operations, especially those of our refining segment, are highly capital intensive. Each of our refineries comprises a large base of property assets, consisting of a series of interconnected, highly integrated and interdependent crude oil processing facilities and supporting logistical infrastructure (Units), and these Units are continuously improved. Improvements consist of the addition of new Units and betterments of existing Units. We plan for these improvements by developing a multi-year capital program that is updated and revised based on changing internal and external factors.
	Depreciation of property assets used in our refining segment is recorded on a straight-line basis over the estimated useful lives of these assets primarily using the composite method of depreciation. We maintain a separate composite group of property assets for each of our refineries. We estimate the useful life of each group based on an evaluation of the property assets comprising the group, and such evaluations consist of, but are not limited to, the physical inspection of the assets to determine their condition, consideration of the manner in which the assets are maintained, assessment of the need to replace assets, and evaluation of the manner in which improvements impact the useful life of the group. The estimated useful lives of our composite groups range primarily from 25 to 30 years.
	Under the composite method of depreciation, the cost of an improvement is added to the composite group to which it relates and is depreciated over that group’s estimated useful life. We design improvements to our refineries in accordance with engineering specifications, design standards and practices accepted in our industry, and these improvements have design lives consistent with our estimated useful lives. Therefore, we believe the use of the group life to depreciate the cost of improvements made to the group is reasonable because the estimated useful life of each improvement is consistent with that of the group. It should be noted, however, that factors such as competition, regulation, or environmental matters could cause us to change our estimates, thus impacting depreciation expense in the future.
	Also under the composite method of depreciation, the historical cost of a minor property asset (net of salvage value) that is retired or replaced is charged to accumulated depreciation and no gain or loss is recognized in income. However, a gain or loss is recognized in income for a major property asset that is retired, replaced, or sold and for an abnormal disposition of a property asset (primarily involuntary conversions). Gains and losses are reflected in depreciation and amortization expense, unless such amounts are reported separately due to materiality.
	Depreciation of property assets used in our ethanol segment and our former retail segment (see Note 3) is recorded on a straight-line basis over the estimated useful lives of the related assets. Leasehold improvements are amortized on a straight-line basis over the shorter of the lease term or the estimated useful life of the related asset. Assets acquired under capital leases are amortized on a straight-line basis over (i) the lease term if transfer of ownership does not occur at the end of the lease term or (ii) the estimated useful life of the asset if transfer of ownership does occur at the end of the lease term.
Deferred Charges and Other Assets	Deferred Charges and Other Assets
	“Deferred charges and other assets, net” include the following:
	•	turnaround costs, which are incurred in connection with planned major maintenance activities at our refineries and ethanol plants and which are deferred when incurred and amortized on a straight-line basis over the period of time estimated to lapse until the next turnaround occurs;
	•	fixed-bed catalyst costs, representing the cost of catalyst that is changed out at periodic intervals when the quality of the catalyst has deteriorated beyond its prescribed function, which are deferred when incurred and amortized on a straight-line basis over the estimated useful life of the specific catalyst;
	•	intangible assets;
	•	investments in entities that we do not control; and
	•	other noncurrent assets such as investments of certain benefit plans (related primarily to certain U.S. nonqualified defined benefit plans whose plan assets are not protected from our creditors and therefore cannot be reflected as a reduction from our obligations under those pension plans), debt issuance costs, and various other costs.
Impairment of Assets	Impairment of Assets
	Long-lived assets, which include property, plant, and equipment, intangible assets, and deferred refinery turnaround and catalysts costs, are tested for recoverability whenever events or changes in circumstances indicate that the carrying amount of the asset may not be recoverable. A long-lived asset is not recoverable if its carrying amount exceeds the sum of the undiscounted cash flows expected to result from its use and eventual disposition. If a long-lived asset is not recoverable, an impairment loss is recognized for the amount by which the carrying amount of the long-lived asset exceeds its fair value, with fair value determined based on discounted estimated net cash flows or other appropriate methods.
Investments	We evaluate our equity method investments for impairment when there is evidence that we may not be able to recover the carrying amount of our investments or the investee is unable to sustain an earnings capacity that justifies the carrying amount. A loss in the value of an investment that is other than a temporary decline is recognized currently in income, and is based on the difference between the estimated current fair value of the investment and its carrying amount.
Environmental Matters	Environmental Matters
	Liabilities for future remediation costs are recorded when environmental assessments and/or remedial efforts are probable and the costs can be reasonably estimated. Other than for assessments, the timing and magnitude of these accruals generally are based on the completion of investigations or other studies or a commitment to a formal plan of action. Amounts recorded for environmental liabilities have not been reduced by possible recoveries from third parties and have not been measured on a discounted basis.
Asset Retirement Obligations	Asset Retirement Obligations
	We record a liability, which is referred to as an asset retirement obligation, at fair value for the estimated cost to retire a tangible long-lived asset at the time we incur that liability, which is generally when the asset is purchased, constructed, or leased. We record the liability when we have a legal obligation to incur costs to retire the asset and when a reasonable estimate of the fair value of the liability can be made. If a reasonable estimate cannot be made at the time the liability is incurred, we record the liability when sufficient information is available to estimate the liability’s fair value.
Foreign Currency Translation	Foreign Currency Translation
	The functional currency of each of our international operations is generally the respective local currency, which includes the Canadian dollar, the Aruban florin, the pound sterling, and the euro. Balance sheet accounts are translated into U.S. dollars using exchange rates in effect as of the balance sheet date. Revenue and expense accounts are translated using the weighted-average exchange rates during the year presented. Foreign currency translation adjustments are recorded as a component of accumulated other comprehensive income.
Revenue Recognition	Revenue Recognition
	Revenues for products sold by the refining and ethanol segments and our former retail segment (see Note 3) are recorded upon delivery of the products to our customers, which is the point at which title to the products is transferred, and when payment has either been received or collection is reasonably assured.
	Excise taxes on sales by our U.S. retail system were presented on a gross basis. All other excise taxes are presented on a net basis.
	We enter into certain purchase and sale arrangements with the same counterparty that are deemed to be made in contemplation of one another. We combine these transactions and, as a result, revenues and cost of sales are not recognized in connection with these arrangements. We also enter into refined product exchange transactions to fulfill sales contracts with our customers by accessing refined products in markets where we do not operate our own refineries. These refined product exchanges are accounted for as exchanges of non-monetary assets, and no revenues are recorded on these transactions.
Product Shipping and Handling Costs	Product Shipping and Handling Costs
	Costs incurred for shipping and handling of products are included in cost of sales.
Cost of Biofuel Credits	Cost of Biofuel Credits
	We purchase biofuel credits (primarily Renewable Identification Numbers (RINs) in the U.S.) to comply with government regulations that require us to blend a certain percentage of biofuels into the products we produce, as further described in Note 21 under “Compliance Program Price Risk.” To the degree that we are unable to blend biofuels at the required percentage, we must purchase biofuel credits in the open market to meet our obligation. The cost of purchased biofuel credits is charged to cost of sales as such credits are needed to satisfy our obligation. To the extent we have not purchased enough biofuel credits to satisfy our obligation as of the balance sheet date, we charge cost of sales for such deficiency based on the market price of the biofuel credits as of the balance sheet date, and we record a liability for our obligation to purchase those credits. See Note 20 for disclosure of our fair value liability.
Stock-Based Compensation	Stock-Based Compensation
	Compensation expense for our share-based compensation plans is based on the fair value of the awards granted and is recognized in income on a straight-line basis over the shorter of (a) the requisite service period of each award or (b) the period from the grant date to the date retirement eligibility is achieved if that date is expected to occur during the nominal vesting period.
Income Taxes	Income Taxes
	Income taxes are accounted for under the asset and liability method. Under this method, deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. Deferred amounts are measured using enacted tax rates expected to apply to taxable income in the year those temporary differences are expected to be recovered or settled. Deferred tax assets are reduced by unrecognized tax benefits, if such items may be available to offset the unrecognized tax benefit.
	We have elected to classify any interest expense and penalties related to the underpayment of income taxes in income tax expense.
Earnings Per Common Share	Earnings per Common Share
	Earnings per common share is computed by dividing net income by the weighted-average number of common shares outstanding for the year. Participating share-based payment awards, including shares of restricted stock granted under certain of our stock-based compensation plans, are included in the computation of basic earnings per share using the two-class method. Earnings per common share – assuming dilution reflects the potential dilution arising from our outstanding stock options and nonvested shares granted to employees in connection with our stock-based compensation plans. Potentially dilutive securities are excluded from the computation of earnings per common share – assuming dilution when the effect of including such shares would be antidilutive.
Financial Instruments	Financial Instruments
	Our financial instruments include cash and temporary cash investments, receivables, payables, debt, capital lease obligations, commodity derivative contracts, and foreign currency derivative contracts. The estimated fair values of these financial instruments approximate their carrying amounts, except for certain debt as discussed in Note 20.
Derivatives and Hedging	Derivatives and Hedging
	All derivative instruments are recorded in the balance sheet as either assets or liabilities measured at their fair values. 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, are 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 in 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 hedging relationships (derivative instruments not designated as fair value or cash flow hedges) and for derivative instruments entered into 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 the statements of cash flows.
New Accounting Pronouncements	New Accounting Pronouncements
	In April 2014, the provisions of Accounting Standards Codification (ASC) Topic 205, “Presentation of Financial Statements,” and ASC Topic 360, “Property, Plant, and Equipment,” were amended to change the criteria for reporting discontinued operations. The provisions of these amendments modify the definition of discontinued operations by limiting discontinued operations reporting to disposals of components of an entity that represent strategic shifts that have or will have a major effect on an entity’s operations and financial results. These amendments require additional disclosures about discontinued operations and new disclosures for other disposals of individually material components of an organization that do not meet the definition of a discontinued operation. In addition, the guidance allows companies to have significant continuing involvement and continuing cash flows with the discontinued operation. These provisions are effective prospectively for annual reporting periods beginning on or after December 15, 2014, and interim periods within those annual periods, with early adoption permitted. The adoption of this guidance effective January 1, 2015 will not affect our financial position or results of operations; however, it may result in changes to the manner in which future dispositions of operations or assets, if any, are presented in our financial statements, or it may require additional disclosures.
	In May 2014, the Financial Accounting Standards Board (FASB) amended the ASC and issued a new accounting standard, Topic 606, “Revenue from Contracts with Customers,” to clarify the principles for recognizing revenue. The core principle of the new standard is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The standard also requires improved interim and annual disclosures that enable the users of financial statements to better understand the nature, amount, timing, and uncertainty of revenues and cash flows arising from contracts with customers. The new standard is effective for annual reporting periods beginning after December 15, 2016, including interim reporting periods within that reporting period, and can be adopted either retrospectively to each prior reporting period presented using a practical expedient, as allowed by the new standard, or retrospectively with a cumulative effect adjustment to retained earnings as of the date of initial application. Early adoption is not permitted. We are currently evaluating the effect that adopting this new standard will have on our financial statements and related disclosures.
	In January 2015, the provisions of ASC Subtopic 225-20, “Income Statement–Extraordinary and Unusual Items” were amended to eliminate the concept of extraordinary items from U.S. GAAP as part of the FASB’s simplification initiative. The guidance eliminates the separate presentation of extraordinary items on the income statement, net of tax and the related earnings per share, but does not affect the requirement to disclose material items that are unusual in nature or infrequently occurring or to exclude those items from the estimated annual effective tax rate for interim reporting purposes. These provisions may be applied prospectively or retrospectively and are effective for annual reporting periods beginning after December 15, 2015, and interim periods within those annual periods, with early adoption permitted. The adoption of this guidance effective January 1, 2016 will not affect our financial position or results of operations; however, it may affect the manner in which future extraordinary or unusual items, if any, are presented in our financial statements.
	In February 2015, the provisions of ASC Topic 810, “Consolidation” were amended to improve consolidation guidance for certain types of legal entities. The guidance modifies the evaluation of whether limited partnerships and similar legal entities are variable interest entities (VIEs) or voting interest entities, eliminates the presumption that a general partner should consolidate a limited partnership, affects the consolidation analysis of reporting entities that are involved with VIEs, particularly those that have fee arrangements and related party relationships, and provides a scope exception from consolidation guidance for certain money market funds. These provisions are effective for annual reporting periods beginning after December 15, 2015, and interim periods within those annual periods, with early adoption permitted. These provisions may also be adopted retrospectively in previously issued financial statements for one or more years with a cumulative-effect adjustment to retained earnings as of the beginning of the first year restated. We are currently evaluating the effect that adopting this new accounting standard will have on our consolidated financial statements and related disclosures.
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.
Derivative instruments collateral requirements	We do not require any collateral or other security to support derivative instruments into which we enter.

Discontinued_Operations_Tables

Discontinued Operations (Tables)	12 Months Ended
	Dec. 31, 2014
Discontinued Operations and Disposal Groups [Abstract]
Selected results of operations of the Aruba Refinery	Selected results of operations of the Aruba Refinery are shown below (in millions).
		Year Ended December 31,
		2014			2013		2012
	Operating revenues	$	—		$	—	$	857
	Income (loss) before income taxes	(64		)	6		(1,034		)
	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 were excluded from our consolidated balance sheet as of December 31, 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

Separation_of_Retail_Business_

Separation of Retail Business (Tables)	12 Months Ended
	Dec. 31, 2014
Disposal Group, Not Discontinued Operation, Disposal Disclosures [Abstract]
Carrying value of retail business assets and liabilities prior to separation	Selected results of operations of the Aruba Refinery are shown below (in millions).
		Year Ended December 31,
		2014			2013		2012
	Operating revenues	$	—		$	—	$	857
	Income (loss) before income taxes	(64		)	6		(1,034		)
	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 were excluded from our consolidated balance sheet as of December 31, 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

Receivables_Tables

Receivables (Tables)	12 Months Ended
	Dec. 31, 2014
Receivables [Abstract]
Receivables, net	Receivables consisted of the following (in millions):
		December 31,
		2014			2013
	Accounts receivable	$	5,509		$	8,582
	Commodity derivative and foreign currency	151			98
	contract receivables
	Other receivables	256			117
		5,916			8,797
	Allowance for doubtful accounts	(37		)	(46		)
	Receivables, net	$	5,879		$	8,751
	Changes in the allowance for doubtful accounts consisted of the following (in millions):
		Year Ended December 31,
		2014			2013			2012
	Balance as of beginning of year	$	46		$	56		$	48
	Increase in allowance charged to expense	7			13			21
	Accounts charged against the allowance,	(15		)	(23		)	(13		)
	net of recoveries
	Foreign currency translation	(1		)	—			—
	Balance as of end of year	$	37		$	46		$	56

Inventories_Tables

Inventories (Tables)	12 Months Ended
	Dec. 31, 2014
Inventory Disclosure [Abstract]
Schedule of inventories	Inventories consisted of the following (in millions):
		December 31,
		2014		2013
	Refinery feedstocks	$	2,269	$	2,135
	Refined products and blendstocks	3,926		3,231
	Ethanol feedstocks and products	195		166
	Materials and supplies	233		226
	Inventories	$	6,623	$	5,758

Property_Plant_and_Equipment_T

Property, Plant, and Equipment (Tables)	12 Months Ended
	Dec. 31, 2014
Property, Plant and Equipment [Abstract]
Major classes of property, plant, and equipment	Major classes of property, plant, and equipment, which include capital lease assets, consisted of the following (in millions):
		December 31,
		2014			2013
	Land	$	396		$	404
	Crude oil processing facilities	28,054			27,260
	Pipeline and terminal facilities	1,955			1,513
	Grain processing equipment	779			719
	Administrative buildings	800			800
	Other	2,596			2,109
	Construction in progress	1,353			1,128
	Property, plant, and equipment, at cost	35,933			33,933
	Accumulated depreciation	(9,198		)	(8,226		)
	Property, plant, and equipment, net	$	26,735		$	25,707

Accrued_Expenses_and_Other_Lon1

Accrued Expenses and Other Long-Term Liabilities (Tables)	12 Months Ended
	Dec. 31, 2014
Accrued Expenses and Other Long-Term Liabilities [Abstract]
Accrued expenses and other long-term liabilities	Accrued expenses and other long-term liabilities consisted of the following (in millions):
			Accrued						Other Long-
			Expenses						Term Liabilities
			December 31,
			2014			2013			2014		2013
	Defined benefit plan liabilities (see Note 14)		$	48		$	30		$	792	$	507
	Wage and other employee-related liabilities		294			257			104		97
	Uncertain income tax position liabilities,		—			—			316		205
	including related penalties and interest (see Note 16) (a)
	Environmental liabilities		26			24			269		277
	Accrued interest expense		88			90			—		—
	Derivative liabilities		—			13			—		—
	Asset retirement obligations		20			5			71		26
	Other accrued liabilities		120			103			387		217
	Accrued expenses and other long-term liabilities		$	596		$	522		$	1,939	$	1,329
	___________________________
	(a) As of December 31, 2014, our total liability for uncertain tax positions, including related penalties and interest, was $484 million, with $168 million classified as a current liability and reflected in “Income taxes payable” and the remaining $316 million classified as a long-term liability and reflected in “Other long-term liabilities” as detailed in this table. As of December 31, 2013, our total liability for uncertain tax positions, including related penalties and interest, was $443 million, with $238 million classified as a current liability and reflected in “Income taxes payable” and the remaining $205 million classified as a long-term liability and reflected in “Other long-term liabilities” as detailed in this table.
Changes in environmental liabilities	Changes in our environmental liabilities were as follows (in millions):
		Year Ended December 31,
		2014			2013			2012
	Balance as of beginning of year	$	301		$	269		$	274
	Additions to liability	26			67			23
	Reductions to liability	—			(1		)	(1		)
	Payments, net of third-party recoveries	(27		)	(28		)	(29		)
	Separation of retail business	—			(4		)	—
	Foreign currency translation	(5		)	(2		)	2
	Balance as of end of year	$	295		$	301		$	269
Changes in asset retirement obligations	Changes in our asset retirement obligations were as follows (in millions).
		Year Ended December 31,
		2014			2013			2012
	Balance as of beginning of year	$	31		$	108		$	87
	Additions to accrual	60			2			14
	Revisions in estimated cash flows	—			—			13
	Accretion expense	1			2			5
	Settlements	(1		)	(1		)	(11		)
	Separation of retail business	—			(80		)	—
	Balance as of end of year	$	91		$	31		$	108

Debt_and_Capital_Lease_Obligat1

Debt and Capital Lease Obligations (Tables)	12 Months Ended
	Dec. 31, 2014
Debt and Capital Lease Obligations [Abstract]
Debt and capital lease obligations	Debt, at stated values, and capital lease obligations consisted of the following (in millions):
		Final		December 31,
		Maturity		2014				2013
	Bank credit facilities	Various		$	—			$	—
	Senior Notes:
	4.50%	2015		400				400
	4.75%	2014		—				200
	6.13%	2017		750				750
	6.13%	2020		850				850
	6.63%	2037		1,500				1,500
	6.75%	2037		24				24
	7.20%	2017		200				200
	7.45%	2097		100				100
	7.50%	2032		750				750
	8.75%	2030		200				200
	9.38%	2019		750				750
	10.50%	2039		250				250
	Debentures:
	7.65%	2026		100				100
	8.75%	2015		75				75
	Gulf Opportunity Zone Revenue Bonds, Series 2010, 4.0%	2040		300				300
	Accounts receivable sales facility	2015		100				100
	Other debt	2015		26				—
	Net unamortized discount, including fair value adjustments			(21		)		(24		)
	Total debt			6,354				6,525
	Capital lease obligations, including unamortized fair value adjustments			32				39
	Total debt and capital lease obligations			6,386				6,564
	Less current portion			(606		)		(303		)
	Debt and capital lease obligations, less current portion			$	5,780			$	6,261
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		December 31,
			Capacity						2014				2013
	Letter of credit facilities		$	550			Jun-15		$	56			$	278
	Revolver		$	3,000			Nov-18		$	54			$	59
	VLP Revolver		$	300			Dec-18		$	—			$	—
	Canadian Revolver		C$	50			Nov-15		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):
		Year Ended December 31,
		2014				2013				2012
	Balance as of beginning of year	$	100			$	100			$	250
	Proceeds from the sale of receivables	—				—				1,500
	Repayments	—				—				(1,650		)
	Balance as of end of year	$	100			$	100			$	100
Principal payments on debt and future minimum rentals on capital lease obligations	Principal payments on our debt obligations and future minimum rentals on capital lease obligations as of December 31, 2014 were as follows (in millions):
		Debt				Capital
						Lease
						Obligations
	2015	$	601			$	8
	2016	—				8
	2017	950				6
	2018	—				6
	2019	750				6
	Thereafter	4,074				18
	Net unamortized discount	(21		)		1
	and fair value adjustments
	Less interest expense	—				(21		)
	Total	$	6,354			$	32

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Future minimum rentals and minimum rentals to be received under subleases for leases having initial or remaining noncancelable lease terms in excess of one year	As of December 31, 2014, our future minimum rentals and minimum rentals to be received under subleases for leases having initial or remaining noncancelable lease terms in excess of one year were as follows (in millions):
	2015	$	314
	2016	229
	2017	159
	2018	131
	2019	75
	Thereafter	275
	Total minimum rental payments	$	1,183
	Minimum rentals to be received	$	14
	under subleases
Rental expense for all operating leases	Rental expense was as follows (in millions):
		Year Ended December 31,
		2014		2013		2012
	Minimum rental expense	$	618	$	588	$	512
	Contingent rental expense	43		47		67
	Total rental expense	661		635		579
	Less sublease rental income	—		—		(2		)
	Net rental expense	$	661	$	635	$	577

Equity_Tables

Equity (Tables)	12 Months Ended
	Dec. 31, 2014
Equity [Abstract]
Share activity	For the years ended December 31, 2014, 2013, and 2012, activity in the number of shares of common stock and treasury stock was as follows (in millions):
		Common			Treasury
		Stock			Stock
	Balance as of December 31, 2011	673			(117	)
	Transactions in connection with
	stock-based compensation plans:
	Stock issuances	—			6
	Stock repurchases	—			(6	)
	Stock repurchases under buyback	—			(4	)
	program
	Balance as of December 31, 2012	673			(121	)
	Transactions in connection with
	stock-based compensation plans:
	Stock issuances	—			6
	Stock repurchases	—			(6	)
	Stock repurchases under buyback	—			(17	)
	program
	Balance as of December 31, 2013	673			(138	)
	Transactions in connection with
	stock-based compensation plans:
	Stock issuances	—			4
	Stock repurchases	—			(2	)
	Stock repurchases under buyback	—			(23	)
	program
	Balance as of December 31, 2014	673			(159	)
Income tax effects related to components of other comprehensive income (loss)	The following table reflects the tax effects allocated to each component of other comprehensive income (loss) for the years ended December 31, 2014, 2013, and 2012 (in millions):
		Before-Tax				Tax Expense				Net Amount
		Amount				(Benefit)
	Year Ended December 31, 2014:
	Foreign currency translation adjustment	$	(407	)		$	—			$	(407	)
	Pension and other postretirement benefits:
	Loss arising during the year related to:
	Net actuarial loss	(471		)		(162		)		(309		)
	Prior service cost	(1		)		(1		)		—
	(Gain) loss reclassified into income related to:
	Net actuarial loss	34				12				22
	Prior service credit	(40		)		(14		)		(26		)
	Curtailment and settlement	3				—				3
	Net loss on pension and other	(475		)		(165		)		(310		)
	postretirement benefits
	Derivative instruments designated and
	qualifying as cash flow hedges:
	Net loss arising during the year	(1		)		—				(1		)
	Net loss reclassified into income	2				1				1
	Net gain on cash flow hedges	1				1				—
	Other comprehensive loss	$	(881	)		$	(164	)		$	(717	)
		Before-Tax				Tax Expense				Net Amount
		Amount				(Benefit)
	Year Ended December 31, 2013:
	Foreign currency translation adjustment	$	(98	)		$	—			$	(98	)
	Pension and other postretirement benefits:
	Gain arising during the year related to:
	Net actuarial gain	367				125				242
	Plan amendments	371				130				241
	(Gain) loss reclassified into income related to:
	Net actuarial loss	57				20				37
	Prior service credit	(33		)		(12		)		(21		)
	Settlement	1				—				1
	Net gain on pension and other	763				263				500
	postretirement benefits
	Derivative instruments designated and
	qualifying as cash flow hedges:
	Net loss arising during the year	(4		)		(2		)		(2		)
	Net loss reclassified into income	2				1				1
	Net loss on cash flow hedges	(2		)		(1		)		(1		)
	Other comprehensive income	$	663			$	262			$	401
	Year Ended December 31, 2012:
	Foreign currency translation adjustment	$	164			$	—			$	164
	Pension and other postretirement benefits:
	Loss arising during the year related to:
	Net actuarial loss	(228		)		(79		)		(149		)
	Prior service cost	(9		)		(3		)		(6		)
	(Gain) loss reclassified into income related to:
	Net actuarial loss	34				12				22
	Prior service credit	(20		)		(7		)		(13		)
	Settlement	12				—				12
	Net loss on pension and other	(211		)		(77		)		(134		)
	postretirement benefits
	Derivative instruments designated and
	qualifying as cash flow hedges:
	Net gain arising during the year	45				16				29
	Net gain reclassified into income	(73		)		(26		)		(47		)
	Net loss on cash flow hedges	(28		)		(10		)		(18		)
	Other comprehensive income (loss)	$	(75	)		$	(87	)		$	12
Changes in components of accumulated other comprehensive income (loss)	Changes in accumulated other comprehensive income (loss) by component, net of tax, were as follows (in millions):
		Foreign				Defined				Gains and			Total
		Currency				Benefit				(Losses) on
		Translation				Plan				Cash Flow
		Adjustment				Items				Hedges
	Balance as of December 31, 2011	$	501			$	(424	)		$	19		$	96
	Other comprehensive income (loss)	164				(134		)		(18		)	12
	Balance as of December 31, 2012	665				(558		)		1			108
	Other comprehensive income (loss)	(98		)		483				(2		)	383
	before reclassifications
	Amounts reclassified from	—				17				1			18
	accumulated other comprehensive
	income (loss)
	Net other comprehensive income (loss)	(98		)		500				(1		)	401
	Separation of retail business	(159		)		—				—			(159		)
	Balance as of December 31, 2013	408				(58		)		—			350
	Other comprehensive loss	(407		)		(309		)		(1		)	(717		)
	before reclassifications
	Amounts reclassified from	—				(1		)		1			—
	accumulated other comprehensive
	income (loss)
	Net other comprehensive loss	(407		)		(310		)		—			(717		)
	Balance as of December 31, 2014	$	1			$	(368	)		$	—		$	(367	)
Gains (losses) reclassified out of accumulated other comprehensive income (loss)	Gains (losses) reclassified out of accumulated other comprehensive income (loss) and into net income were as follows (in millions):
	Details about										Affected Line
	Accumulated Other										Item in the
	Comprehensive Income		Year Ended December 31,								Statement of
	(Loss) Components		2014				2013				Income
	Amortization of items related to
	defined benefit pension plans:
	Net actuarial loss		$	(34	)		$	(57	)		(a)
	Prior service credit		40				33				(a)
	Curtailment and settlement		(3		)		(1		)		(a)
			3				(25		)		Total before tax
			(2		)		8				Tax (expense) benefit
			$	1			$	(17	)		Net of tax
	Losses on cash flow hedges:
	Commodity contracts		$	(2	)		$	(2	)		Cost of sales
			(2		)		(2		)		Total before tax
			1				1				Tax benefit
			$	(1	)		$	(1	)		Net of tax
	Total reclassifications for the year		$	—			$	(18	)		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 14. Net periodic benefit cost is reflected in operating expenses and general and administrative expenses.

Employee_Benefit_Plans_Tables

Employee Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2014
Compensation and Retirement Disclosure [Abstract]
The changes in benefit obligation, the changes in fair value of plan assets, and the funded status of our pension plans and other postretirement benefit plans	The changes in benefit obligation related to all of our defined benefit plans, the changes in fair value of plan assets(a), and the funded status of our defined benefit plans as of and for the years ended were as follows (in millions):
		Pension Plans								Other Postretirement
										Benefit Plans
		December 31,								December 31,
		2014				2013				2014			2013
	Changes in benefit obligation:
	Benefit obligation as of beginning of year	$	1,914			$	2,307			$	324		$	436
	Service cost	120				137				7			12
	Interest cost	91				86				15			18
	Participant contributions	—				—				7			15
	Plan amendments	2				(274		)		—			(43		)
	Curtailment gain	—				(6		)		—			—
	Benefits paid	(109		)		(170		)		(30		)	(37		)
	Actuarial (gain) loss	440				(169		)		37			(77		)
	Other	(8		)		3				1			—
	Benefit obligation as of end of year	$	2,450			$	1,914			$	361		$	324
	Changes in plan assets(a):
	Fair value of plan assets as of beginning of year	$	1,909			$	1,729			$	—		$	—
	Actual return on plan assets	139				306				—			—
	Valero contributions	46				41				20			19
	Participant contributions	—				—				7			15
	Benefits paid	(109		)		(170		)		(30		)	(37		)
	Other	(7		)		3				3			3
	Fair value of plan assets as of end of year	$	1,978			$	1,909			$	—		$	—
	Reconciliation of funded status(a):
	Fair value of plan assets as of end of year	$	1,978			$	1,909			$	—		$	—
	Less benefit obligation as of end of year	2,450				1,914				361			324
	Funded status as of end of year	$	(472	)		$	(5	)		$	(361	)	$	(324	)
	Accumulated benefit obligation	$	2,354			$	1,811			n/a			n/a
	___________________________
	(a)	Plan assets include only the assets associated with pension plans subject to legal minimum funding standards. Plan assets associated with U.S. nonqualified pension plans are not included here because they are not protected from our creditors and therefore cannot be reflected as a reduction from our obligations under the pension plans. As a result, the reconciliation of funded status does not reflect the effect of plan assets that exist for all of our defined benefit plans. See Note 20 for the assets associated with certain U.S. nonqualified pension plans.
Schedule of amounts recognized in balance sheet	Amounts recognized in our balance sheet for our pension and other postretirement benefits plans as of December 31, 2014 and 2013 include (in millions):
		Pension Plans								Other Postretirement
										Benefit Plans
		2014				2013				2014			2013
	Deferred charges and other assets, net	$	7			$	208			$	—		$	—
	Accrued expenses	(28		)		(11		)		(20		)	(19		)
	Other long-term liabilities	(451		)		(202		)		(341		)	(305		)
		$	(472	)		$	(5	)		$	(361	)	$	(324	)
Benefit obligations in excess of fair value of plan assets	The accumulated benefit obligations for certain of our pension plans exceed the fair values of the assets of those plans. For those plans, the table below presents the total projected benefit obligation, accumulated benefit obligation, and fair value of the plan assets (in millions).
		December 31,
		2014				2013
	Projected benefit obligation	$	2,288			$	215
	Accumulated benefit obligation	2,217				168
	Fair value of plan assets	1,812				3
Expected benefit payments	Benefit payments that we expect to pay, including amounts related to expected future services, and the anticipated Medicare subsidies that we expect to receive are as follows for the years ending December 31 (in millions):
		Pension				Other
		Benefits				Postretirement
						Benefits
	2015	$	131			$	20
	2016	127				20
	2017	132				21
	2018	142				21
	2019	189				21
	2020-2024	845				108
Components of net periodic benefit costs	The components of net periodic benefit cost related to our defined benefit plans were as follows (in millions):
		Pension Plans											Other Postretirement
													Benefit Plans
		Year Ended December 31,											Year Ended December 31,
		2014				2013				2012			2014				2013			2012
	Components of net periodic
	benefit cost:
	Service cost	$	120			$	137			$	140		$	7			$	12		$	12
	Interest cost	91				86				93			15				18			21
	Expected return on plan assets	(133		)		(131		)		(125		)	—				—			—
	Amortization of:
	Prior service cost (credit)	(22		)		(19		)		3			(18		)		(14		)	(23		)
	Net actuarial (gain) loss	35				57				33			(1		)		—			1
	Special charges (credits)	3				(5		)		(3		)	—				—			—
	Net periodic benefit cost	$	94			$	125			$	141		$	3			$	16		$	11
Pre-tax amounts recognized in other comprehensive income	Pre-tax amounts recognized in other comprehensive income were as follows (in millions):
		Pension Plans											Other Postretirement
													Benefit Plans
		Year Ended December 31,											Year Ended December 31,
		2014				2013				2012			2014				2013			2012
	Net gain (loss) arising during
	the year:
	Net actuarial gain (loss)	$	(434	)		$	290			$	(245	)	$	(37	)		$	77		$	17
	Prior service cost	(1		)		—				(9		)	—				—			—
	Remeasurement due to plan	—				328				—			—				43			—
	amendments
	Net (gain) loss reclassified into
	income:
	Net actuarial (gain) loss	35				57				33			(1		)		—			1
	Prior service cost (credit)	(22		)		(19		)		3			(18		)		(14		)	(23		)
	Curtailment and settlement loss	3				1				12			—				—			—
	Total changes in other	$	(419	)		$	657			$	(206	)	$	(56	)		$	106		$	(5	)
	comprehensive income (loss)
Pre-tax amounts in accumulated other comprehensive income not yet recognized	The pre-tax amounts in accumulated other comprehensive income as of December 31, 2014 and 2013 that have not yet been recognized as components of net periodic benefit cost were as follows (in millions):
		Pension Plans								Other Postretirement
										Benefit Plans
		2014				2013				2014			2013
	Prior service credit	$	(210	)		$	(233	)		$	(92	)	$	(110	)
	Net actuarial (gain) loss	876				479				(6		)	(44		)
	Total	$	666			$	246			$	(98	)	$	(154	)
Pre-tax amounts in accumulated other comprehensive income to be recognized in the next fiscal year	The following pre-tax amounts included in accumulated other comprehensive income as of December 31, 2014 are expected to be recognized as components of net periodic benefit cost during the year ending December 31, 2015 (in millions):
		Pension Plans				Other
						Postretirement
						Benefit Plans
	Amortization of prior service credit	$	(22	)		$	(18	)
	Amortization of net actuarial loss	63				—
	Total	$	41			$	(18	)
Weighted-average assumptions used to determine the benefit obligations and net periodic benefit cost	The weighted-average assumptions used to determine the net periodic benefit cost for the years ended December 31, 2014, 2013, and 2012 were as follows:
		Pension Plans									Other Postretirement
											Benefit Plans
		2014			2013			2012			2014		2013			2012
	Discount rate	4.92	%		4.33	%		5.08	%		4.88	%	4.19	%		4.97	%
	Expected long-term rate of return	7.61	%		7.62	%		7.67	%		—	%	—	%		—	%
	on plan assets
	Rate of compensation increase	3.81	%		3.73	%		3.68	%		—	%	—	%		—	%
	The weighted-average assumptions used to determine the benefit obligations as of December 31, 2014 and 2013 were as follows:
		Pension Plans						Other
								Postretirement
								Benefit Plans
		2014			2013			2014			2013
	Discount rate	4.1	%		4.92	%		4.13	%		4.88	%
	Rate of compensation increase	3.78	%		3.81	%		—	%		—	%
Assumed health care cost trend rates	The assumed health care cost trend rates as of December 31, 2014 and 2013 were as follows:
		2014			2013
	Health care cost trend rate assumed for the next year	7.36	%		7.39	%
	Rate to which the cost trend rate was assumed to decline	5	%		5	%
	(the ultimate trend rate)
	Year that the rate reaches the ultimate trend rate	2020			2020
Effect of one percentage-point change in assumed health care cost trend rates	A one percentage-point change in assumed health care cost trend rates would have the following effects on other postretirement benefits (in millions):
		1% Increase				1% Decrease
	Effect on total of service and interest cost components	$	—			$	—
	Effect on accumulated postretirement benefit obligation	5				(4		)
Fair value of pension plan assets by level of fair value hierarchy	The tables below present the fair values of the assets of our pension plans (in millions) as of December 31, 2014 and 2013 by level of the fair value hierarchy. Assets categorized in Level 1 of the hierarchy are measured at fair value using a market approach based on quotations from national securities exchanges. Assets categorized in Level 2 of the hierarchy are measured at net asset value as a practical expedient for fair value. As previously noted, we do not fund or fully fund U.S. nonqualified and certain international pension plans that are not subject to funding requirements, and we do not fund our other postretirement benefit plans.
		Fair Value Measurements Using											Total as of
													December 31,
		Level 1				Level 2				Level 3			2014
	Equity securities:
	U.S. companies(a)	$	541			$	—			$	—		$	541
	International companies	144				—				—			144
	Preferred stock	1				1				—			2
	Mutual funds:
	International growth	119				—				—			119
	Index funds(b)	199				—				—			199
	Corporate debt instruments	—				263				—			263
	Government securities:
	U.S. Treasury securities	71				—				—			71
	Other government securities	—				100				—			100
	Common collective trusts	—				379				—			379
	Private fund	—				40				—			40
	Insurance contracts	—				18				—			18
	Interest and dividends receivable	5				—				—			5
	Cash and cash equivalents	75				22				—			97
	Total	$	1,155			$	823			$	—		$	1,978
	______________________
	See notes on page 98.
		Fair Value Measurements Using											Total as of
													December 31,
		Level 1				Level 2				Level 3			2013
	Equity securities:
	U.S. companies(a)	$	529			$	—			$	—		$	529
	International companies	155				—				—			155
	Preferred stock	2				1				—			3
	Mutual funds:
	International growth	131				—				—			131
	Index funds(b)	160				—				—			160
	Corporate debt instruments	—				260				—			260
	Government securities:
	U.S. Treasury securities	81				—				—			81
	Other government securities	—				79				—			79
	Common collective trusts	—				373				—			373
	Private fund	—				38				—			38
	Insurance contracts	—				17				—			17
	Interest and dividends receivable	5				—				—			5
	Cash and cash equivalents	72				6				—			78
	Total	$	1,135			$	774			$	—		$	1,909
	__________________________________
	(a)	Equity securities are held in a wide range of industrial sectors, including consumer goods, information technology, healthcare, industrials, and financial services.
	(b)	This class includes primarily investments in approximately 60 percent equities and 40 percent bonds.

StockBased_Compensation_Tables

Stock-Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of stock-based compensation expense and tax benefits	The following table reflects activity related to our stock-based compensation arrangements (in millions):
		Year Ended December 31,
		2014			2013				2012
	Stock-based compensation expense	$	60		$	64			$	58
	Tax benefit recognized on stock-based	21			22				20
	compensation expense
	Tax benefit realized for tax deductions	64			66				45
	resulting from exercises and vestings
	Effect of tax deductions in excess of	47			47				27
	recognized stock-based compensation
	expense reported as a financing cash flow
Summary of weighted-average assumptions used in fair value measurements	A summary of the weighted-average assumptions used in our fair value measurements is presented in the table below.
		Year Ended December 31,
		2014		2013			2012
	Expected life in years	6		6			6
	Expected volatility	43.21	%	49.63	%		49.11	%
	Expected dividend yield	2.27	%	2.27	%		2.39	%
	Risk-free interest rate	1.74	%	1.77	%		0.85	%
Summary of stock option awards	A summary of the status of our stock option awards is presented in the table below.
		Number of		Weighted-				Weighted-		Aggregate
		Stock		Average				Average		Intrinsic
		Options		Exercise				Remaining		Value
				Price Per				Contractual
				Share				Term
								(in years)		(in millions)
	Outstanding as of January 1, 2014	8,558,093		$	27.88
	Granted	126,095		48.57
	Exercised	(2,564,125	)	18.64
	Expired	(1,449,986	)	66.67
	Forfeited	(856	)	17.68
	Outstanding as of December 31, 2014	4,669,221		21.48				4.5		$	131
	Exercisable as of December 31, 2014	4,315,414		19.99				4.2		127
	The following table reflects activity related to our stock options granted (in millions, except per share data):
		Year Ended December 31,
		2014			2013				2012
	Weighted average grant-date fair value price per share	$	17.31		$	15.83			$	10.98
	Intrinsic value of stock options exercised	85			101				78
	Cash received from stock option exercises	47			59				59
Summary of restricted stock awards	A summary of the status of our restricted stock awards is presented in the table below.
		Number of		Weighted-
		Shares		Average
				Grant-Date
				Fair Value
				Per Share
	Nonvested shares as of January 1, 2014	2,205,314		$	32.23
	Granted	969,671		49.4
	Vested	(1,402,753	)	31.9
	Forfeited	(14,082	)	32.56
	Nonvested shares as of December 31, 2014	1,758,150		41.96
Summary of performance awards	Performance awards converted during the year ended December 31, 2014 were as follows:
		Vested		Actual		Number of
		Awards		Conversion		Shares
		Converted		Rate		Issued
	2010 awards	201,422		100%		201,422
	2011 awards	227,571		200%		455,142
	2012 awards	102,855		200%		205,710
	2013 awards	2,180		200%		4,360
	Total	534,028				866,634
	A summary of the status of our performance awards considered granted is presented below.
		Nonvested		Vested
		Awards		Awards
	Awards outstanding as of January 1, 2014	947,165		—
	Granted	225,829		—
	Vested	(534,028	)	534,028
	Converted	—		(534,028	)
	Forfeited	(24,576	)	—
	Awards outstanding as of December 31, 2014	614,390		—
	There were three tranches of performance awards granted during the year ended December 31, 2014 as follows:
		Awards		Expected		Fair Value
		Granted		Conversion		Per Share
				Rate
	Third tranche of 2012 awards	99,023		100%		$	47.47
	Second tranche of 2013 awards	76,232		100%		47.47
	First tranche of 2014 awards	50,574		100%		48.57
	Total	225,829

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Income from continuing operations before income tax expense from U.S. and international operations	Income from continuing operations before income tax expense was as follows (in millions):
		Year Ended December 31,
		2014			2013			2012
	U.S. operations	$	4,677		$	3,531		$	4,015
	International operations	875			445			725
	Income from continuing operations before	$	5,552		$	3,976		$	4,740
	income tax expense
Reconciliation of income tax expense related to continuing operations to federal income tax expense at U.S. federal statutory rate	The following is a reconciliation of income tax expense computed by applying the U.S. federal statutory income tax rate (35 percent for all years presented) to actual income tax expense related to continuing operations (in millions):
		Year Ended December 31,
		2014			2013			2012
	Federal income tax expense	$	1,943		$	1,392		$	1,659
	at the U.S. federal statutory rate
	U.S. state income tax expense,	62			62			64
	net of U.S. federal income tax effect
	U.S. manufacturing deduction	(74		)	(36		)	(33		)
	International operations	(88		)	(69		)	(96		)
	Permanent differences	(16		)	(104		)	20
	Change in tax law	—			(32		)	—
	Other, net	(50		)	41			12
	Income tax expense	$	1,777		$	1,254		$	1,626
Components of income tax expense related to continuing operations	Components of income tax expense related to continuing operations were as follows (in millions):
		Year Ended December 31,
		2014			2013			2012
	Current:
	U.S. federal	$	1,196		$	635		$	515
	U.S. state	59			36			22
	International	77			82			126
	Total current	1,332			753			663
	Deferred:
	U.S. federal	268			459			854
	U.S. state	36			59			77
	International	141			(17		)	32
	Total deferred	445			501			963
	Income tax expense	$	1,777		$	1,254		$	1,626
Deferred income tax assets and liabilities	The tax effects of significant temporary differences representing deferred income tax assets and liabilities were as follows (in millions):
		December 31,
		2014			2013
	Deferred income tax assets:
	Tax credit carryforwards	$	37		$	48
	Net operating losses (NOLs)	436			338
	Inventories	160			264
	Property, plant, and equipment	—			8
	Compensation and employee benefit liabilities	358			178
	Environmental liabilities	92			92
	Other	178			187
	Total deferred income tax assets	1,261			1,115
	Less: Valuation allowance	(393		)	(347		)
	Net deferred income tax assets	868			768
	Deferred income tax liabilities:
	Property, plant, and equipment	6,682			6,536
	Deferred turnaround costs	356			331
	Inventories	426			310
	Investments	152			94
	Other	73			81
	Total deferred income tax liabilities	7,689			7,352
	Net deferred income tax liabilities	$	6,821		$	6,584
Income tax credit and loss carryforwards	We had the following income tax credit and loss carryforwards as of December 31, 2014 (in millions):
		Amount			Expiration
	U.S. state income tax credits	$	53		2015 through 2027
	U.S. state NOLs (gross amount)	6,574			2015 through 2034
	International NOLs	1,630			Unlimited
Subsequently recognized tax benefits related to the valuation allowance for deferred income tax assets	Should we ultimately recognize tax benefits related to the valuation allowance for deferred income tax assets as of December 31, 2014, such amounts will be allocated as follows (in millions):
	Income tax benefit	$	386
	Additional paid-in capital	7
	Total	$	393
Reconciliation of the change in unrecognized tax benefits	The following is a reconciliation of the change in unrecognized tax benefits, excluding related penalties, interest (net of the U.S. federal and state income tax effects), and the U.S. federal income tax effect of state unrecognized tax benefits (in millions):
		Year Ended December 31,
		2014			2013			2012
	Balance as of beginning of year	$	950		$	341		$	326
	Additions based on tax positions related to the current year	35			64			11
	Additions for tax positions related to prior years	118			576			40
	Reductions for tax positions related to prior years	(67		)	(26		)	(36		)
	Reductions for tax positions related to the lapse of	(1		)	(4		)	—
	applicable statute of limitations
	Settlements	(46		)	(1		)	—
	Balance as of end of year	$	989		$	950		$	341
Reconciliation of unrecognized tax benefits to uncertain tax position liabilities	The following is a reconciliation of unrecognized tax benefits reflected in the table above to our uncertain tax position liabilities as of December 31, 2014 and 2013 that are reflected in Note 10 (in millions):
		December 31,
		2014			2013
	Unrecognized tax benefits	$	989		$	950
	Tax refund claim not recognized in our financial statements	(554		)	(556		)
	Penalties, interest (net of U.S. federal and state income tax	49			49
	effect), and the U.S. federal income tax effect of state
	unrecognized tax benefits
	Uncertain tax position liabilities	$	484		$	443

Earnings_Per_Common_Share_Tabl

Earnings Per Common Share (Tables)	12 Months Ended
	Dec. 31, 2014
Earnings Per Share [Abstract]
Schedule of earnings per common share, basic and diluted	Earnings per common share from continuing operations were computed as follows (dollars and shares in millions, except per share amounts):
		Year Ended December 31,
		2014				2013				2012
		Restricted		Common		Restricted		Common		Restricted		Common
		Stock		Stock		Stock		Stock		Stock		Stock
	Earnings per common share
	from continuing operations:
	Net income attributable to			$	3,694			$	2,714			$	3,117
	Valero stockholders from
	continuing operations
	Less dividends paid:
	Common stock			552				460				358
	Nonvested restricted stock			2				2				2
	Undistributed earnings			$	3,140			$	2,252			$	2,757
	Weighted-average common	2		526		3		542		3		550
	shares outstanding
	Earnings per common share
	from continuing operations:
	Distributed earnings	$	1.05	$	1.05	$	0.85	$	0.85	$	0.65	$	0.65
	Undistributed earnings	5.95		5.95		4.13		4.13		4.99		4.99
	Total earnings per common	$	7	$	7	$	4.98	$	4.98	$	5.64	$	5.64
	share from continuing
	operations
	Earnings per common share
	from continuing operations –
	assuming dilution:
	Net income attributable to			$	3,694			$	2,714			$	3,117
	Valero stockholders from
	continuing operations
	Weighted-average common			526				542				550
	shares outstanding
	Common equivalent shares:
	Stock options			2				4				4
	Performance awards and			2				2				2
	nonvested restricted stock
	Weighted-average common			530				548				556
	shares outstanding –
	assuming dilution
	Earnings per common share			$	6.97			$	4.96			$	5.61
	from continuing operations –
	assuming dilution

Segment_Information_Tables

Segment Information (Tables)	12 Months Ended
	Dec. 31, 2014
Segment Reporting [Abstract]
Segment activity, including total assets by reportable segment	Total assets by reportable segment were as follows (in millions):
		December 31,
		2014		2013
	Refining	$	40,103	$	41,227
	Ethanol	954		889
	Corporate	4,493		5,144
	Total assets	$	45,550	$	47,260
	In March 2014, we purchased an idled corn ethanol plant in Mount Vernon, Indiana for $34 million from a wholly owned subsidiary of Aventine Renewable Energy Holdings, Inc. We resumed production at that plant during the third quarter of 2014. In the fourth quarter of 2014, an independent appraisal of the assets acquired and liabilities assumed and certain other evaluations of the fair values related to the Mount Vernon plant were completed and finalized. The purchase price of the Mount Vernon plant was allocated based on the fair values of the assets acquired and the liabilities assumed at the date of acquisition resulting from this final appraisal and other evaluations. There were no significant adjustments made to the preliminary purchase price allocation.
	The following table reflects activity related to continuing operations (in millions):
		Refining		Ethanol			Retail		Corporate			Total
	Year ended December 31, 2014:
	Operating revenues from external	$	126,004	$	4,840		$	—	$	—		$	130,844
	customers
	Intersegment revenues	—		100			—		—			100
	Depreciation and amortization expense	1,597		49			—		44			1,690
	Operating income (loss)	5,884		786			—		(768		)	5,902
	Total expenditures for long-lived assets	2,750		42			—		30			2,822
	Year ended December 31, 2013:
	Operating revenues from external	129,064		5,114			3,896		—			138,074
	customers
	Intersegment revenues	2,876		128			—		—			3,004
	Depreciation and amortization expense	1,566		45			41		68			1,720
	Operating income (loss)	4,211		491			81		(826		)	3,957
	Total expenditures for long-lived assets	2,597		33			62		65			2,757
	Year ended December 31, 2012:
	Operating revenues from external	122,068		4,317			12,008		—			138,393
	customers
	Intersegment revenues	8,946		115			—		—			9,061
	Depreciation and amortization expense	1,345		42			119		43			1,549
	Operating income (loss)	5,484		(47		)	348		(741		)	5,044
	Total expenditures for long-lived assets	3,147		36			164		66			3,413
Operating revenues from external customers by product	Operating revenues from external customers for our principal products were as follows (in millions):
		Year Ended December 31,
		2014		2013			2012
	Refining:
	Gasolines and blendstocks	$	56,846	$	57,806		$	55,647
	Distillates	57,521		56,921			51,095
	Petrochemicals	3,759		4,281			3,908
	Lubes and asphalts	1,397		1,643			2,033
	Other product revenues	6,481		8,413			9,385
	Total refining operating revenues	126,004		129,064			122,068
	Ethanol:
	Ethanol	4,192		4,245			3,545
	Distillers grains	648		869			772
	Total ethanol operating revenues	4,840		5,114			4,317
	Retail:
	Fuel sales (gasoline and diesel)	—		3,226			10,045
	Merchandise sales and other	—		524			1,649
	Home heating oil	—		146			314
	Total retail operating revenues	—		3,896			12,008
	Total operating revenues	$	130,844	$	138,074		$	138,393
Operating revenues by geographic area of customer	Operating revenues by geographic area are shown in the table below (in millions). The geographic area is based on location of customer and no customer accounted for 10 percent or more of our operating revenues.
		Year Ended December 31,
		2014		2013			2012
	U.S.	$	91,499	$	100,418		$	99,879
	Canada	10,410		9,974			10,376
	U.K. and Ireland	14,182		13,675			12,818
	Other countries	14,753		14,007			15,320
	Total operating revenues	$	130,844	$	138,074		$	138,393
Geographic information by country for long-lived assets	Geographic information by country for long-lived assets consisted of the following (in millions):
		December 31,
		2014		2013
	U.S.	$	24,710	$	23,572
	Canada	2,250		2,260
	U.K.	1,206		1,148
	Aruba	59		53
	Ireland	22		26
	Total long-lived assets	$	28,247	$	27,059

Supplemental_Cash_Flow_Informa1

Supplemental Cash Flow Information (Tables)	12 Months Ended
	Dec. 31, 2014
Supplemental Cash Flow Information [Abstract]
Supplemental Cash Flow Disclosures	Cash flows related to interest and income taxes paid were as follows (in millions):
		Year Ended December 31,
		2014			2013			2012
	Interest paid in excess of amount capitalized	$	392		$	361		$	302
	Income taxes paid, net	1,624			387			705
	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):
		Year Ended December 31,
		2014			2013			2012
	Decrease (increase) in current assets:
	Receivables, net	$	2,753		$	(753	)	$	437
	Inventories	(1,014		)	(13		)	(282		)
	Income taxes receivable	(23		)	10			51
	Prepaid expenses and other	(32		)	2			(28		)
	Increase (decrease) in current liabilities:
	Accounts payable	(3,149		)	977			(113		)
	Accrued expenses	38			53			13
	Taxes other than income taxes	(64		)	337			(260		)
	Income taxes payable	(319		)	309			(120		)
	Changes in current assets and current liabilities	$	(1,810	)	$	922		$	(302	)

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Fair value of financial 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 December 31, 2014 and 2013.
	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.
		31-Dec-14
								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	$	3,096	$	36	$	—	$	3,132	$	(2,907	)	$	(99	)	$	126	$	—
	contracts
	Physical purchase	—		1		—		1		n/a			n/a			1		n/a
	contracts
	Investments of certain	97		—		11		108		n/a			n/a			108		n/a
	benefit plans
	Total	$	3,193	$	37	$	11	$	3,241	$	(2,907	)	$	(99	)	$	235
	Liabilities:
	Commodity derivative	$	2,886	$	34	$	—	$	2,920	$	(2,907	)	$	(13	)	$	—	$	(25	)
	contracts
	Biofuels blending	—		14		—		14		n/a			n/a			14		n/a
	obligation
	Physical purchase	—		5		—		5		n/a			n/a			5		n/a
	contracts
	Total	$	2,886	$	53	$	—	$	2,939	$	(2,907	)	$	(13	)	$	19
		December 31, 2013
								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	$	499	$	38	$	—	$	537	$	(505	)	$	(7	)	$	25	$	—
	contracts
	Investments of certain	98		—		11		109		n/a			n/a			109		n/a
	benefit plans
	Total	$	597	$	38	$	11	$	646	$	(505	)	$	(7	)	$	134
	Liabilities:
	Commodity derivative	$	492	$	24	$	—	$	516	$	(505	)	$	(6	)	$	5	$	(76	)
	contracts
	Biofuels blending	—		11		—		11		n/a			n/a			11		n/a
	obligation
	Physical purchase	—		5		—		5		n/a			n/a			5		n/a
	contracts
	Foreign currency	8		—		—		8		n/a			n/a			8		n/a
	contracts
	Total	$	500	$	40	$	—	$	540	$	(505	)	$	(6	)	$	29
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):
		December 31, 2014				December 31, 2013
		Carrying		Fair		Carrying		Fair
		Amount		Value		Amount		Value
	Financial assets:
	Cash and temporary cash investments	$	3,689	$	3,689	$	4,292	$	4,292
	Financial liabilities:
	Debt (excluding capital leases)	6,354		7,562		6,525		7,659

Price_Risk_Management_Activiti1

Price Risk Management Activities (Tables)	12 Months Ended
	Dec. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Risk management activities by type of risk	As of December 31, 2014, we had the following outstanding commodity 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).
			Notional Contract Volumes by
			Year of Maturity
	Derivative Instrument		2015			2016
	Crude oil and refined products:
	Swaps – long		645			—
	Swaps – short		645			—
	Futures – long		95,709			5,116
	Futures – short		96,897			4,341
	Options – long		1,900			—
	Options – short		1,200			—
	Natural gas:
	Futures – long		6,200			—
	Futures – short		4,200			—
	As of December 31, 2014, we had the following outstanding commodity derivative instruments that were used as economic hedges, as well as 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		2015			2016
	Crude oil and refined products:
	Swaps – long		7,532			—
	Swaps – short		5,676			—
	Futures – long		46,886			—
	Futures – short		67,600			—
	Natural gas:
	Options – long		1,250			—
	Corn:
	Futures – long		20,815			80
	Futures – short		46,585			1,155
	Physical contracts – long		25,327			1,081
	Soybean oil:
	Futures – long		94,920			—
	Futures – short		178,920			—
Fair values of derivative instruments	The following tables provide information about the fair values of our derivative instruments as of December 31, 2014 and 2013 (in millions) and the line items in the balance sheets in which the fair values are reflected. See Note 20 for additional information related to the fair values of our derivative instruments.
	As indicated in Note 20, 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		December 31, 2014
		Location		Asset				Liability
				Derivatives				Derivatives
	Derivatives not designated as
	hedging instruments
	Commodity contracts:
	Futures	Receivables, net		$	3,096			$	2,886
	Swaps	Receivables, net		34				31
	Options	Receivables, net		2				3
	Physical purchase contracts	Inventories		1				5
	Total			$	3,133			$	2,925
		Balance Sheet		31-Dec-13
		Location		Asset				Liability
				Derivatives				Derivatives
	Derivatives designated as
	hedging instruments
	Commodity contracts:
	Futures	Receivables, net		$	25			$	36
	Derivatives not designated as
	hedging instruments
	Commodity contracts:
	Futures	Receivables, net		$	474			$	455
	Swaps	Receivables, net		33				18
	Swaps	Prepaid expenses and other		3				—
	Swaps	Accrued expenses		—				5
	Options	Receivables, net		2				2
	Physical purchase contracts	Inventories		—				5
	Foreign currency contracts	Accrued expenses		—				8
	Total			$	512			$	493
	Total derivatives			$	537			$	529
Effect of derivative instruments on income and OCI
	Derivatives Designated as		Location of Gain (Loss)		Year Ended December 31,
	Economic Hedges and Other		Recognized in Income
	Derivative Instruments		on Derivatives		2014				2013			2012
	Commodity contracts		Cost of sales		$	693			$	193		$	1
	Foreign currency contracts		Cost of sales		40				14			(38		)
	Derivatives in Cash Flow		Location of Gain (Loss)		Year Ended December 31,
	Hedging Relationships		Recognized in Income
			on Derivatives		2014				2013			2012
	Commodity contracts:
	Gain (loss) recognized in				$	(1	)		$	(4	)	$	45
	OCI on derivatives
	(effective portion)
	Gain (loss) reclassified from		Cost of sales		(2		)		(2		)	73
	accumulated OCI into
	income (effective portion)
	Gain (loss) recognized in		Cost of sales		(1		)		21			48
	income on derivatives
	(ineffective portion)
	Trading Derivatives		Location of Gain (Loss)		Year Ended December 31,
			Recognized in Income
			on Derivatives		2014				2013			2012
	Commodity contracts		Cost of sales		$	38			$	21		$	(16	)
	RINs fixed-price contracts		Cost of sales		—				(20		)	—
	The following tables provide information about the gain or loss recognized in income and other comprehensive income (OCI) 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)		Year Ended December 31,
	Hedging Relationships		Recognized in Income
			on Derivatives		2014				2013			2012
	Commodity contracts:
	Loss recognized in		Cost of sales		$	(42	)		$	(12	)	$	(250	)
	income on derivatives
	Gain recognized in		Cost of sales		42				18			183
	income on hedged item
	Gain (loss) recognized in		Cost of sales		—				6			(67		)
	income on derivatives
	(ineffective portion)

Quarterly_Financial_Data_Unaud1

Quarterly Financial Data (Unaudited) (Tables)	12 Months Ended
	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Schedule of quarterly financial information	The following table summarizes quarterly financial data for the years ended December 31, 2014 and 2013 (in millions, except per share amounts). The amounts shown below differ from those previously reported in our quarterly reports on Form 10-Q for the quarters ended March 31, 2013 and 2014 due to the abandonment of the Aruba Refinery in May 2014 as discussed in Note 2. The results of operations of the Aruba Refinery have been presented as discontinued operations for all periods presented.
		2014 Quarter Ended
		31-Mar		30-Jun		30-Sep		31-Dec
	Operating revenues	$	33,663	$	34,914	$	34,408	$	27,859
	Operating income	1,351		1,085		1,670		1,796
	Net income	836		593		1,062		1,220
	Net income attributable to	828		588		1,059		1,155
	Valero Energy Corporation
	stockholders
	Earnings per common share	1.55		1.11		2.01		2.22
	Earnings per common share –	1.54		1.1		2		2.22
	assuming dilution
		2013 Quarter Ended
		31-Mar		June 30 (a)		30-Sep		31-Dec
	Operating revenues	33,474		34,034		36,137		34,429
	Operating income	1,058		805		532		1,562
	Net income	652		465		324		1,287
	Net income attributable to	654		466		312		1,288
	Valero Energy Corporation
	stockholders
	Earnings per common share	1.18		0.86		0.58		2.39
	Earnings per common share –	1.18		0.85		0.57		2.38
	assuming dilution
	____________________
	(a)	The separation of our retail business was completed on May 1, 2013.

Basis_of_Presentation_and_Summ2

Basis of Presentation and Summary of Significant Accounting Policies (Details)	12 Months Ended
	Dec. 31, 2014
	plants
	refineries
	branded_wholesale_sites
Basis of Presentation and Summary of Significant Accounting Policies (Textual)
Number of refineries owned	15
Combined total throughput capacity of petroleum refining (barrels per day)	2,900,000
Number of branded wholesale sites	7,400
Number of ethanol plants owned	11
Combined capacity of ethanol (gallons per year)	1,300,000,000
Minimum [Member]
Basis of Presentation and Summary of Significant Accounting Policies (Textual)
Property, plant, and equipment, useful life	25 years
Maximum [Member]
Basis of Presentation and Summary of Significant Accounting Policies (Textual)
Property, plant, and equipment, useful life	30 years

Discontinued_Operations_Detail

Discontinued Operations (Details) (USD $)	12 Months Ended			3 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jun. 30, 2014	Dec. 31, 2011
Discontinued Operations (Textual)
Asset impairment losses	$0	$0	$86
Asset retirement obligation recognized	91	31	108		87
Asset retirement obligation charged to accretion expense	1	2	5
Aruba Refinery [Member]
Selected Results of Operations of the Aruba Refinery
Operating revenues	0	0	857
Income (loss) before income taxes	-64	6	-1,034
Discontinued Operations (Textual)
Asset impairment losses			928
Severance costs			41
Asset retirement obligation recognized				59
Asset retirement obligation charged to accretion expense				59
Liabilities recognized for obligations under certain contracts				$4

Separation_of_Retail_Business_1

Separation of Retail Business (Details) (USD $)	12 Months Ended			0 Months Ended			3 Months Ended	0 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Nov. 14, 2013	1-May-13	Apr. 30, 2013	Jun. 30, 2013	Apr. 16, 2013	Dec. 31, 2011
Assets
Cash and temporary cash investments	$3,689,000,000	$4,292,000,000	$1,723,000,000						$1,024,000,000
Inventories	6,623,000,000	5,758,000,000
Deferred income taxes	162,000,000	266,000,000
Prepaid expenses and other	164,000,000	138,000,000
Total current assets	16,614,000,000	19,277,000,000
Property, plant, and equipment, at cost	35,933,000,000	33,933,000,000
Accumulated depreciation	-9,198,000,000	-8,226,000,000
Property, plant, and equipment, net	26,735,000,000	25,707,000,000
Deferred charges and other assets, net	2,201,000,000	2,276,000,000
Total assets	45,550,000,000	47,260,000,000
Liabilities
Current portion of capital lease obligations	606,000,000	303,000,000
Accrued expenses	596,000,000	522,000,000
Taxes other than income taxes	1,209,000,000	1,345,000,000
Total current liabilities	9,980,000,000	13,123,000,000
Debt and capital lease obligations, less current portion	5,780,000,000	6,261,000,000
Deferred income taxes	6,607,000,000	6,601,000,000
Other long-term liabilities	1,939,000,000	1,329,000,000
Separation of Retail Business (Textual)
Proceeds from short-term debt in anticipation of separation	0	550,000,000	0
Cash distributed to Valero by CST Brands, Inc.	0	500,000,000	0
Senior unsecured bonds of CST Brands, Inc. issued to us	256,000,000	117,000,000
Cash held and retained by CST Brands, Inc. upon separation	0	315,000,000	0
Gain on disposition of retained interest in CST Brands, Inc.	0	325,000,000	0
Spinoff [Member]
Assets
Cash and temporary cash investments					315,000,000
Credit card receivables from Valero					44,000,000
Other receivables, net					109,000,000
Inventories					170,000,000
Deferred income taxes					14,000,000
Prepaid expenses and other					13,000,000
Total current assets					665,000,000
Property, plant, and equipment, at cost					1,891,000,000
Accumulated depreciation					-611,000,000
Property, plant, and equipment, net					1,280,000,000
Intangible assets, net					38,000,000
Deferred charges and other assets, net					191,000,000
Total assets					2,174,000,000
Liabilities
Current portion of capital lease obligations					2,000,000
Trade payable to Valero					242,000,000
Other accounts payable					96,000,000
Accrued expenses					31,000,000
Taxes other than income taxes					20,000,000
Total current liabilities					391,000,000
Debt and capital lease obligations, less current portion					1,053,000,000
Deferred income taxes					83,000,000
Other long-term liabilities					112,000,000
Total liabilities					1,639,000,000
Separation of Retail Business (Textual)
Spinoff transaction, ownership percentage by Valero stockholders					80.00%
Aggregate proceeds received related to separation of CST Brands, Inc					1,050,000,000
Cash distributed to Valero by CST Brands, Inc.					500,000,000
Senior unsecured bonds of CST Brands, Inc. issued to us					550,000,000
Cash held and retained by CST Brands, Inc. upon separation						315,000,000
Cost of separation in general and administrative expenses							30,000,000
Retained ownership percentage disposed				20.00%
Gain on disposition of retained interest in CST Brands, Inc.				325,000,000
Spinoff [Member] | Notes Payable to Banks [Member]
Separation of Retail Business (Textual)
Proceeds from short-term debt in anticipation of separation								550,000,000
CST Brands, Inc. securities exchanged in settlement of short-term borrowings				$467,000,000	$550,000,000

Impairments_Details

Impairments (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Impairments (Textual)
Asset impairment losses	$0	$0	$86
Construction in Progress [Member]
Impairments (Textual)
Asset impairment losses			65
Retail Assets [Member]
Impairments (Textual)
Asset impairment losses			$21

Valero_Energy_Partners_LP_Deta

Valero Energy Partners LP (Details) (USD $)	12 Months Ended			0 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jul. 01, 2014	Dec. 16, 2013	Dec. 31, 2011
Noncontrolling Interest Transactions Textual [Abstract]
Net proceeds from initial public offering of common units of Valero Energy Partners LP	$0	$369	$0
Cash and temporary cash investments	3,689	4,292	1,723			1,024
Noncontrolling interests	567	486
Valero Energy Partners LP [Member]
Noncontrolling Interest Transactions Textual [Abstract]
Cash and temporary cash investments	237	375
Noncontrolling interests	375	370
Valero Energy Partners LP [Member] | Texas Crude Systems Business [Member]
Noncontrolling Interest Transactions Textual [Abstract]
Proceeds from sale of property, plant, and equipment				154
Limited Partner [Member]
Noncontrolling Interest Transactions Textual [Abstract]
Noncontrolling interest, ownership percentage by parent	68.60%	68.60%
Noncontrolling interest, ownership percentage by public	29.40%	29.40%
General Partner [Member]
Noncontrolling Interest Transactions Textual [Abstract]
Noncontrolling interest, ownership percentage by parent	2.00%	2.00%
Offering [Member] | Valero Energy Partners LP [Member]
Noncontrolling Interest Transactions Textual [Abstract]
Common units sold in the Offering					17,250,000
Common unit price per unit					$23
Net proceeds from initial public offering of common units of Valero Energy Partners LP					$369

Receivables_Details

Receivables (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Receivables
Accounts receivable	$5,509	$8,582
Commodity derivative and foreign currency contract receivables	151	98
Other receivables	256	117
Receivables, gross	5,916	8,797
Allowance for doubtful accounts	-37	-46	-56
Receivables, net	5,879	8,751
Allowance for Doubtful Accounts Rollforward
Balance as of beginning of year	46	56	48
Increase in allowance charged to expense	7	13	21
Accounts charged against the allowance, net of recoveries	15	23	13
Foreign currency translation	-1	0	0
Balance as of end of year	$37	$46	$56

Inventories_Details

Inventories (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2014
Schedule of Inventories
Refinery feedstocks	$2,135		$2,269
Refined products and blendstocks	3,231		3,926
Ethanol feedstocks and products	166		195
Materials and supplies	226		233
Inventories	5,758		6,623
Inventories (Textual)
Effect of LIFO inventory liquidation on income, decrease	17	134
Excess of market value over carrying amount of LIFO inventories	6,900		857
Inventory not valued at LIFO	$681		$906

Property_Plant_and_Equipment_D

Property, Plant, and Equipment (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Property, Plant, and Equipment, Net
Property, plant, and equipment, at cost	$35,933,000,000	$33,933,000,000
Accumulated depreciation	-9,198,000,000	-8,226,000,000
Property, plant, and equipment, net	26,735,000,000	25,707,000,000
Property, Plant, and Equipment (Textual)
Property, plant, and equipment, assets under capital leases	72,000,000	74,000,000
Accumulated amortization on assets under capital leases	-40,000,000	-35,000,000
Depreciation expense related to continuing operations	1,200,000,000	1,200,000,000	1,100,000,000
Land [Member]
Property, Plant, and Equipment, Net
Property, plant, and equipment, at cost	396,000,000	404,000,000
Crude Oil Processing Facilities (Member)
Property, Plant, and Equipment, Net
Property, plant, and equipment, at cost	28,054,000,000	27,260,000,000
Pipeline and Terminal Facilities [Member]
Property, Plant, and Equipment, Net
Property, plant, and equipment, at cost	1,955,000,000	1,513,000,000
Grain Processing Equipment [Member]
Property, Plant, and Equipment, Net
Property, plant, and equipment, at cost	779,000,000	719,000,000
Administrative Buildings (Member)
Property, Plant, and Equipment, Net
Property, plant, and equipment, at cost	800,000,000	800,000,000
Other [Member]
Property, Plant, and Equipment, Net
Property, plant, and equipment, at cost	2,596,000,000	2,109,000,000
Construction in Progress [Member]
Property, Plant, and Equipment, Net
Property, plant, and equipment, at cost	$1,353,000,000	$1,128,000,000

Deferred_Charges_and_Other_Ass1

Deferred Charges and Other Assets (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Deferred Charges and Other Assets (Textual)
Amortization expense, deferred refinery turnaround and catalyst costs and other assets	$489	$498	$447

Accrued_Expenses_and_Other_Lon2

Accrued Expenses and Other Long-Term Liabilities (Details) (USD $)	Dec. 31, 2014		Dec. 31, 2013
In Millions, unless otherwise specified
Accrued Expenses
Defined benefit plan liabilities, current	$48		$30
Wage and other employee-related liabilities, current	294		257
Environmental liabilities, current	26		24
Accrued interest expense, current	88		90
Derivative liabilities, current	0		13
Asset retirement obligations, current	20		5
Other accrued liabilities, current	120		103
Accrued expenses	596		522
Other Long-Term Liabilities
Defined benefit plan liabilities, noncurrent	792		507
Wage and other employee-related liabilities, noncurrent	104		97
Uncertain income tax position liabilities, including related penalties and interest	316	[1]	205	[1]
Environmental liabilities, noncurrent	269		277
Derivative liabilities, noncurrent	0		0
Asset retirement obligations, noncurrent	71		26
Other accrued liabilities, noncurrent	387		217
Other long-term liabilities	1,939		1,329
Uncertain tax position liabilities	484		443
Income Taxes Payable [Member]
Other Long-Term Liabilities
Uncertain tax position liabilities, current	$168		$238
[1]	As of December 31, 2014, our total liability for uncertain tax positions, including related penalties and interest, was $484 million, with $168 million classified as a current liability and reflected in “Income taxes payable” and the remaining $316 million classified as a long-term liability and reflected in “Other long-term liabilities” as detailed in this table. As of December 31, 2013, our total liability for uncertain tax positions, including related penalties and interest, was $443 million, with $238 million classified as a current liability and reflected in “Income taxes payable” and the remaining $205 million classified as a long-term liability and reflected in “Other long-term liabilities” as detailed in this table.

Accrued_Expenses_and_Other_Lon3

Accrued Expenses and Other Long-Term Liabilities, Environmental Matters (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Changes in Environmental Liabilities Rollforward Analysis
Balance as of beginning of year	$301	$269	$274
Additions to liability	26	67	23
Reductions to liability	0	-1	-1
Payments, net of third-party recoveries	-27	-28	-29
Separation of retail business	0	-4	0
Foreign currency translation	-5	-2	2
Balance as of end of year	$295	$301	$269

Accrued_Expenses_and_Other_Lon4

Accrued Expenses and Other Long-Term Liabilities, Asset Retirement Obligations (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Asset Retirement Obligations Rollforward Analysis
Balance as of beginning of year	$31	$108	$87
Additions to accrual	60	2	14
Revisions in estimated cash flows	0	0	13
Accretion expense	1	2	5
Settlements	-1	-1	-11
Separation of retail business	0	-80	0
Balance as of end of year	$91	$31	$108
Retail Location [Member]
Asset Retirement Obligations (Textual)
Property, plant, and equipment, useful life	20 years

Debt_and_Capital_Lease_Obligat2

Debt and Capital Lease Obligations (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2011
Debt Instruments
Net unamortized discount, including fair value adjustments	($21,000,000)		($24,000,000)
Total debt	6,354,000,000		6,525,000,000
Capital lease obligations, including unamortized fair value adjustments	32,000,000		39,000,000
Total debt and capital lease obligations	6,386,000,000		6,564,000,000
Less current portion	-606,000,000		-303,000,000
Debt and capital lease obligations, less current portion	5,780,000,000		6,261,000,000
A/R Sales Facility [Member]
Debt Instruments
Long-term debt at stated values	100,000,000	100,000,000	100,000,000	250,000,000
Credit Facilities [Member] | Bank Credit Facilities [Member]
Debt Instruments
Long-term debt at stated values	0		0
Credit Facilities [Member] | A/R Sales Facility [Member]
Debt Instruments
Debt instrument, maturity date (year)	31-Jul-15
Long-term debt at stated values	100,000,000		100,000,000
Senior Notes [Member] | Senior Notes Due In 2015 [Member]
Debt Instruments
Debt instrument, maturity date (year)	31-Dec-15
Long-term debt at stated values	400,000,000		400,000,000
Interest rate of notes in percentage	4.50%
Senior Notes [Member] | Senior Notes Due In 2014 [Member]
Debt Instruments
Debt instrument, maturity date (year)	31-Dec-14
Long-term debt at stated values	0		200,000,000
Interest rate of notes in percentage	4.75%
Senior Notes [Member] | Senior Notes Due In June 2017 [Member]
Debt Instruments
Debt instrument, maturity date (year)	31-Dec-17
Long-term debt at stated values	750,000,000		750,000,000
Interest rate of notes in percentage	6.13%
Senior Notes [Member] | Senior Notes Due In 2020 [Member]
Debt Instruments
Debt instrument, maturity date (year)	31-Dec-20
Long-term debt at stated values	850,000,000		850,000,000
Interest rate of notes in percentage	6.13%
Senior Notes [Member] | Senior Notes Due In June 2037 [Member]
Debt Instruments
Debt instrument, maturity date (year)	31-Dec-37
Long-term debt at stated values	1,500,000,000		1,500,000,000
Interest rate of notes in percentage	6.63%
Senior Notes [Member] | Senior Notes Due In October 2037 [Member]
Debt Instruments
Debt instrument, maturity date (year)	31-Dec-37
Long-term debt at stated values	24,000,000		24,000,000
Interest rate of notes in percentage	6.75%
Senior Notes [Member] | Senior Notes Due In October 2017 [Member]
Debt Instruments
Debt instrument, maturity date (year)	31-Dec-17
Long-term debt at stated values	200,000,000		200,000,000
Interest rate of notes in percentage	7.20%
Senior Notes [Member] | Senior Notes Due In 2097 [Member]
Debt Instruments
Debt instrument, maturity date (year)	31-Dec-97
Long-term debt at stated values	100,000,000		100,000,000
Interest rate of notes in percentage	7.45%
Senior Notes [Member] | Senior Notes Due In 2032 [Member]
Debt Instruments
Debt instrument, maturity date (year)	31-Dec-32
Long-term debt at stated values	750,000,000		750,000,000
Interest rate of notes in percentage	7.50%
Senior Notes [Member] | Senior Notes Due In 2030 [Member]
Debt Instruments
Debt instrument, maturity date (year)	31-Dec-30
Long-term debt at stated values	200,000,000		200,000,000
Interest rate of notes in percentage	8.75%
Senior Notes [Member] | Senior Notes Due In 2019 [Member]
Debt Instruments
Debt instrument, maturity date (year)	31-Dec-19
Long-term debt at stated values	750,000,000		750,000,000
Interest rate of notes in percentage	9.38%
Senior Notes [Member] | Senior Notes Due In 2039 [Member]
Debt Instruments
Debt instrument, maturity date (year)	31-Dec-39
Long-term debt at stated values	250,000,000		250,000,000
Interest rate of notes in percentage	10.50%
Debentures [Member] | Debenture Due In 2026 [Member]
Debt Instruments
Debt instrument, maturity date (year)	31-Dec-26
Long-term debt at stated values	100,000,000		100,000,000
Interest rate of notes in percentage	7.65%
Debentures [Member] | Debenture Due In 2015 [Member]
Debt Instruments
Debt instrument, maturity date (year)	31-Dec-15
Long-term debt at stated values	75,000,000		75,000,000
Interest rate of notes in percentage	8.75%
Debentures [Member] | Other Debt [Member]
Debt Instruments
Debt instrument, maturity date (year)	31-Dec-15
Long-term debt at stated values	26,000,000		0
Revenue Bonds [Member] | Gulf Opportunity Zone Revenue Bonds Series 2010 [Member]
Debt Instruments
Debt instrument, maturity date (year)	1-Dec-40	1-Dec-40
Long-term debt at stated values	$300,000,000		$300,000,000
Interest rate of notes in percentage	4.00%	4.00%

Debt_Credit_Facilities_and_Ban

Debt, Credit Facilities and Bank Debt (Details)

12 Months Ended

0 Months Ended

0 Months Ended

12 Months Ended

12 Months Ended

12 Months Ended

12 Months Ended

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2012

Nov. 14, 2013

1-May-13

Nov. 14, 2013

Oct. 24, 2013

1-May-13

Apr. 16, 2013

Dec. 31, 2014

Dec. 31, 2013

Mar. 20, 2013

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2014

Dec. 31, 2013

USD ($)

USD ($)

USD ($)

Spinoff [Member]

Spinoff [Member]

Spinoff [Member]

Spinoff [Member]

Spinoff [Member]

Spinoff [Member]

Other Letter of Credit [Member]

Other Letter of Credit [Member]

Credit Facilities [Member]

Credit Facilities [Member]

Credit Facilities [Member]

Credit Facilities [Member]

Credit Facilities [Member]

Credit Facilities [Member]

Credit Facilities [Member]

Credit Facilities [Member]

Credit Facilities [Member]

Credit Facilities [Member]

Credit Facilities [Member]

Credit Facilities [Member]

Credit Facilities [Member]

Credit Facilities [Member]

Credit Facilities [Member]

Credit Facilities [Member]

Credit Facilities [Member]

Credit Facilities [Member]

Credit Facilities [Member]

USD ($)

USD ($)

Notes Payable to Banks [Member]

Notes Payable to Banks [Member]

Notes Payable to Banks [Member]

Notes Payable to Banks [Member]

USD ($)

USD ($)

Spinoff [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]

VLP Revolver [Member]

VLP Revolver [Member]

VLP Revolver [Member]

VLP Revolver Letter of Credit [Member]

VLP 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]

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

Maximum [Member]

USD ($)

USD ($)

USD ($)

USD ($)

Maximum [Member]

USD ($)

USD ($)

CAD

CAD

CAD

CAD

CAD

quarter

renewal

Line of Credit Facility

Line of credit facility, maximum borrowing capacity

$800,000,000

$550,000,000

$3,000,000,000

$300,000,000

50,000,000

Line of credit facility, expiration date

30-Jun-15

30-Nov-18

31-Dec-18

30-Nov-15

Amount outstanding

80,000,000

189,000,000

56,000,000

278,000,000

54,000,000

59,000,000

0

0

10,000,000

10,000,000

Credit Facilities (Textual)

Line of credit facility, accordion feature, higher borrowing capacity option

4,500,000,000

500,000,000

Line of credit facility, duration of renewal option (in years)

1 year

1 year

Debt to capitalization ratios as per terms of revolver

0.12

0.12

0.6

Line of credit facility, number of renewal options

2

Number of prior quarterly reporting periods used for debt to EBITDA ratio

4

Debt to EBITDA ratio as per terms of revolver

5

Borrowings from long-term lines of credit

0

0

1,100,000,000

0

0

0

0

0

Repayments of long-term lines of credit

0

0

1,100,000,000

0

0

0

0

0

Bank Debt (Textual)

Proceeds from short-term debt in anticipation of separation

0

550,000,000

0

550,000,000

Senior unsecured bonds of CST Brands, Inc. issued to us

256,000,000

117,000,000

550,000,000

CST Brands, Inc. securities exchanged in settlement of short-term borrowings

467,000,000

550,000,000

Proceeds from short-term debt related to disposition of retained interest

0

525,000,000

0

525,000,000

Repayment of short-term debt related to disposition of retained interest

58,000,000

Fees paid related to disposition of retained interest

42,000,000

57,000,000

101,000,000

19,000,000

Gain on disposition of retained interest in CST Brands, Inc.

$0

$325,000,000

$0

$325,000,000

Debt_NonBank_Debt_Details

Debt, Non-Bank Debt (Details) (USD $)	12 Months Ended			1 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Feb. 26, 2015
Senior Notes [Member] | Senior Notes Due In 2015 [Member]
Non-Bank Debt (Textual)
Interest rate of notes in percentage	4.50%
Debt instrument, maturity date (month, day, year)	31-Dec-15
Senior Notes [Member] | Senior Notes Due In 2014 [Member]
Non-Bank Debt (Textual)
Debt repayments	200,000,000
Interest rate of notes in percentage	4.75%
Debt instrument, maturity date (month, day, year)	31-Dec-14
Senior Notes [Member] | Senior Notes Due In January 2013 [Member]
Non-Bank Debt (Textual)
Debt repayments		180,000,000
Interest rate of notes in percentage		6.70%
Senior Notes [Member] | Senior Notes Due In June 2013 [Member]
Non-Bank Debt (Textual)
Debt repayments		300,000,000
Interest rate of notes in percentage		4.75%
Revenue Bonds [Member] | Tax Exempt Industrial Revenue Bonds Series 1997 [Member]
Non-Bank Debt (Textual)
Interest rate of notes in percentage			5.60%
Revenue Bonds [Member] | Tax Exempt Industrial Revenue Bonds Series 1998 [Member]
Non-Bank Debt (Textual)
Interest rate of notes in percentage			5.60%
Revenue Bonds [Member] | Tax Exempt Industrial Revenue Bonds Series 1999 [Member]
Non-Bank Debt (Textual)
Interest rate of notes in percentage			5.70%
Revenue Bonds [Member] | Tax Exempt Industrial Revenue Bonds Series 2001 [Member]
Non-Bank Debt (Textual)
Interest rate of notes in percentage			6.65%
Revenue Bonds [Member] | Tax Exempt Industrial Revenue Bonds Series 1997A [Member]
Non-Bank Debt (Textual)
Debt repayments			4,000,000
Interest rate of notes in percentage			5.45%
Revenue Bonds [Member] | Tax Exempt Industrial Revenue Bonds [Member]
Non-Bank Debt (Textual)
Debt repayments			108,000,000
Redemption value in percentage			100.00%
Revenue Bonds [Member] | Gulf Opportunity Zone Revenue Bonds Series 2010 [Member]
Non-Bank Debt (Textual)
Interest rate of notes in percentage	4.00%		4.00%
Proceeds from advances for construction			300,000,000
Debt instrument, maturity date (month, day, year)	1-Dec-40		1-Dec-40
Debt instrument, mandatory tender date			1-Jun-22
Notes [Member] | Notes Due In 2012 [Member]
Non-Bank Debt (Textual)
Debt repayments			750,000,000
Interest rate of notes in percentage			6.88%
Subsequent Event [Member] | Senior Notes [Member] | Senior Notes Due In 2015 [Member]
Non-Bank Debt (Textual)
Debt repayments				$400,000,000
Interest rate of notes in percentage				4.50%

Debt_Accounts_Receivable_Sales

Debt, Accounts Receivable Sales Facility and Capitalized Interest (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Capitalized Interest (Textual)
Interest costs incurred, capitalized	$70,000,000	$118,000,000	$220,000,000
A/R Sales Facility [Member]
Accounts Receivable Sales Facility
Balance as of beginning of year				250,000,000
Balance as of end of year	100,000,000	100,000,000	100,000,000	250,000,000
Credit Facilities [Member] | A/R Sales Facility [Member]
Accounts Receivable Sales Facility
Proceeds from the sale of receivables	0	0	1,500,000,000
Repayments	0	0	-1,650,000,000
Accounts Receivable Sales Facility (Textual)
Line of credit facility, maximum borrowing capacity	1,500,000,000
Extended term of accounts receivable sales facility	31-Jul-15
Designated pool of accounts receivable	$1,700,000,000	$3,300,000,000

Debt_Other_Disclosures_Details

Debt, Other Disclosures (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Principal Payments Due on Debt
2015	$601
2016	0
2017	950
2018	0
2019	750
Thereafter	4,074
Net unamortized discount and fair value adjustments	-21	-24
Total debt	6,354	6,525
Future Minimum Rental on Capital Lease Obligations
2015	8
2016	8
2017	6
2018	6
2019	6
Thereafter	18
Capital lease, net unamortized fair value adjustment	1
Less interest expense	-21
Total capital lease obligations	$32	$39

Commitments_and_Contingencies_1

Commitments and Contingencies (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Future Minimum Rental Payments
2015	$314
2016	229
2017	159
2018	131
2019	75
Thereafter	275
Total minimum rental payments under operating leases	1,183
Minimum rentals to be received under subleases	14
Rental Expense
Minimum rental expense	618	588	512
Contingent rental expense	43	47	67
Total rental expense	661	635	579
Less sublease rental income	0	0	-2
Net rental expense	661	635	577
Commitments and Contingencies (Textual)
Minimum range of possible loss contingency	0
Maximum range of possible loss contingency	$200

Equity_Stock_Related_Disclosur

Equity, Stock Related Disclosures (Details) (USD $)	0 Months Ended	12 Months Ended			2 Months Ended
	Jan. 23, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Feb. 20, 2015
Transactions in connection with stock-based compensation plans:
Treasury stock, ending balance		-159,202,872	-137,932,138
Equity (Textual)
Preferred stock, shares authorized		20,000,000
Preferred stock, par value per share		$0.01
Subsequent Event [Member] | Dividend Declared [Member]
Equity (Textual)
Dividends payable, date declared	23-Jan-15
Dividends payable, amount per share	$0.40
Dividends payable, date to be paid	3-Mar-15
Dividends payable, date of record	11-Feb-15
Stock-Based Compensation Plans Repurchase Program [Member]
Equity (Textual)
Stock repurchases under buyback program		$128,000,000	$236,000,000	$153,000,000
Common Stock Repurchase Program [Member]
Equity (Textual)
Stock repurchases under buyback program		1,168,000,000	692,000,000	118,000,000
Approvals Under Program Two [Member]
Equity (Textual)
Authorized amount under stock purchase program		3,000,000,000
Remaining amount authorized under stock purchase programs		1,500,000,000
Approvals Under Program One [Member]
Equity (Textual)
Authorized amount under stock purchase program		6,000,000,000
Common Stock [Member]
Share Activity Rollforward
Common stock, beginning balance		673,000,000	673,000,000	673,000,000
Transactions in connection with stock-based compensation plans:
Stock issuances		0	0	0
Common stock, ending balance		673,000,000	673,000,000	673,000,000
Treasury Stock [Member]
Share Activity Rollforward
Treasury stock, beginning balance		-138,000,000	-121,000,000	-117,000,000
Transactions in connection with stock-based compensation plans:
Stock issuances		4,000,000	6,000,000	6,000,000
Treasury stock, ending balance		-159,000,000	-138,000,000	-121,000,000
Treasury Stock [Member] | Stock-Based Compensation Plans Repurchase Program [Member]
Transactions in connection with stock-based compensation plans:
Stock repurchases		-2,000,000	-6,000,000	-6,000,000
Equity (Textual)
Stock repurchases under buyback program		128,000,000	236,000,000	163,000,000
Stock repurchases		2,000,000	6,000,000	6,000,000
Treasury Stock [Member] | Common Stock Repurchase Program [Member]
Transactions in connection with stock-based compensation plans:
Stock repurchases		-23,000,000	-17,000,000	-4,000,000
Equity (Textual)
Stock repurchases under buyback program		1,168,000,000	692,000,000	118,000,000
Stock repurchases		23,000,000	17,000,000	4,000,000
Treasury Stock [Member] | Common Stock Repurchase Program [Member] | Subsequent Event [Member]
Transactions in connection with stock-based compensation plans:
Stock repurchases					-1,000,000
Equity (Textual)
Stock repurchases under buyback program					$57,000,000
Stock repurchases					1,000,000

Equity_Income_Tax_Effects_on_O

Equity, Income Tax Effects on Other Comprehensive Income (Loss) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Effects Related to Components of Other Comprehensive Income (Loss)
Foreign currency translation adjustment, before-tax amount	($407)	($98)	$164
Pension and other postretirement benefits:
Net actuarial gain (loss) arising during the year, before-tax amount	-471	367	-228
Plan amendments, before tax amount		371
Prior service cost arising during the year, before tax amount	-1		-9
(Gain) loss reclassified into income related to:
Net actuarial loss, before-tax amount	34	57	34
Prior service credit, before-tax amount	-40	-33	-20
Curtailment and settlement, before-tax amount	3	1	12
Net gain (loss) on pension and other postretirement benefits, before-tax amount	-475	763	-211
Derivative instruments designated and qualifying as cash flow hedges:
Net gain (loss) arising during the year, before-tax amount	-1	-4	45
Net (gain) loss reclassified into income, before-tax amount	2	2	-73
Net gain (loss) on cash flow hedges, before-tax amount	1	-2	-28
Other comprehensive income (loss) before income tax expense (benefit)	-881	663	-75
Foreign currency translation adjustment, tax expense (benefit)	0	0	0
Pension and other postretirement benefits:
Net actuarial gain (loss) arising during the year, tax expense (benefit)	-162	125	-79
Plan amendments, tax expense		130
Prior service cost arising during the year, tax benefit	-1		-3
(Gain) loss reclassified into income related to:
Net actuarial loss, tax expense	12	20	12
Prior service credit, tax benefit	-14	-12	-7
Curtailment and settlement, tax expense (benefit)	0	0	0
Net gain (loss) on pension and other postretirement benefits, tax expense (benefit)	-165	263	-77
Derivative instruments designated and qualifying as cash flow hedges:
Net gain (loss) arising during the year, tax expense (benefit)	0	-2	16
Net (gain) loss reclassified into income, tax expense (benefit)	1	1	-26
Net gain (loss) on cash flow hedges, tax expense (benefit)	1	-1	-10
Other comprehensive income (loss), tax expense (benefit)	-164	262	-87
Foreign currency translation adjustment, net	-407	-98	164
Pension and other postretirement benefits:
Net actuarial gain (loss) arising during the year, net	-309	242	-149
Plan amendments, net		241
Prior service cost arising during the year, net	0		-6
(Gain) loss reclassified into income related to:
Net actuarial loss, net	22	37	22
Prior service credit, net	-26	-21	-13
Curtailment and settlement, net	3	1	12
Net gain (loss) on pension and other postretirement benefits, net	-310	500	-134
Derivative instruments designated and qualifying as cash flow hedges:
Net gain (loss) arising during the year, net	-1	-2	29
Net (gain) loss reclassified into income, net	1	1	-47
Net gain (loss) on cash flow hedges, net	0	-1	-18
Other comprehensive income (loss)	($717)	$401	$12

Equity_Changes_in_Accumulated_

Equity, Changes in Accumulated Other Comprehensive Income (Loss) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Changes in Accumulated Other Comprehensive Income (Loss) by Component, Net of Tax
Accumulated other comprehensive income (loss), net of tax	$350
Other comprehensive income (loss)	-717	401	12
Separation of retail business		-479
Accumulated other comprehensive income (loss), net of tax	-367	350
Accumulated Other Comprehensive Income (Loss) [Member]
Changes in Accumulated Other Comprehensive Income (Loss) by Component, Net of Tax
Accumulated other comprehensive income (loss), net of tax	350	108	96
Other comprehensive income (loss)	-717	401	12
Other comprehensive income (loss), before reclassifications, net of tax	-717	383
Amounts reclassified from accumulated other comprehensive income (loss)	0	18
Separation of retail business		-159
Accumulated other comprehensive income (loss), net of tax	-367	350	108
Accumulated Translation Adjustment [Member]
Changes in Accumulated Other Comprehensive Income (Loss) by Component, Net of Tax
Accumulated other comprehensive income (loss), net of tax	408	665	501
Other comprehensive income (loss)	-407	-98	164
Other comprehensive income (loss), before reclassifications, net of tax	-407	-98
Amounts reclassified from accumulated other comprehensive income (loss)	0	0
Separation of retail business		-159
Accumulated other comprehensive income (loss), net of tax	1	408	665
Accumulated Defined Benefit Plans Adjustment [Member]
Changes in Accumulated Other Comprehensive Income (Loss) by Component, Net of Tax
Accumulated other comprehensive income (loss), net of tax	-58	-558	-424
Other comprehensive income (loss)	-310	500	-134
Other comprehensive income (loss), before reclassifications, net of tax	-309	483
Amounts reclassified from accumulated other comprehensive income (loss)	-1	17
Separation of retail business		0
Accumulated other comprehensive income (loss), net of tax	-368	-58	-558
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Changes in Accumulated Other Comprehensive Income (Loss) by Component, Net of Tax
Accumulated other comprehensive income (loss), net of tax	0	1	19
Other comprehensive income (loss)	0	-1	-18
Other comprehensive income (loss), before reclassifications, net of tax	-1	-2
Amounts reclassified from accumulated other comprehensive income (loss)	1	1
Separation of retail business		0
Accumulated other comprehensive income (loss), net of tax	$0	$0	$1

Equity_Reclassification_Out_of

Equity, Reclassification Out of Accumulated Other Comprehensive Income (Loss) (Details) (USD $)	3 Months Ended									12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013		Mar. 31, 2013	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Amortization of items related to defined benefit pension plans:
Net actuarial loss, before-tax amount										$34		$57		$34
Prior service credit, before-tax amount										-40		-33		-20
Curtailment and settlement, before-tax amount										3		1		12
Total before tax										5,552		3,976		4,740
Tax (expense) benefit										-1,777		-1,254		-1,626
Net income (loss)	1,220	1,062	593	836	1,287	324	465	[1]	652	3,711		2,728		2,080
Reclassification out of Accumulated Other Comprehensive Income (Loss) [Member]
Amortization of items related to defined benefit pension plans:
Net income (loss)										0		-18
Reclassification out of Accumulated Other Comprehensive Income (Loss) [Member] | Accumulated Defined Benefit Plans Adjustment [Member]
Amortization of items related to defined benefit pension plans:
Net actuarial loss, before-tax amount										-34	[2]	-57	[2]
Prior service credit, before-tax amount										40	[2]	33	[2]
Curtailment and settlement, before-tax amount										-3	[2]	-1	[2]
Total before tax										3		-25
Tax (expense) benefit										-2		8
Net income (loss)										1		-17
Reclassification out of Accumulated Other Comprehensive Income (Loss) [Member] | Accumulated Net Loss from Designated or Qualifying Cash Flow Hedges [Member]
Amortization of items related to defined benefit pension plans:
Total before tax										-2		-2
Tax (expense) benefit										1		1
Net income (loss)										-1		-1
Reclassification out of Accumulated Other Comprehensive Income (Loss) [Member] | Accumulated Net Loss from Designated or Qualifying Cash Flow Hedges [Member] | Commodity Contract [Member]
Amortization of items related to defined benefit pension plans:
Cost of sales										($2)		($2)
[1]	The separation of our retail business was completed on May 1, 2013.
[2]	(a)These accumulated other comprehensive income (loss) components are included in the computation of net periodic benefit cost, as further discussed in Note 14. Net periodic benefit cost is reflected in operating expenses and general and administrative expenses.

Employee_Benefit_Plans_Details

Employee Benefit Plans (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Changes in benefit obligation:
Actuarial (gain) loss	$477,000,000
Changes in plan assets(a):
Fair value of plan assets at beginning of year	1,909,000,000
Fair value of plan assets at end of year	1,978,000,000	1,909,000,000
Defined Benefit Plan, Amounts Recognized in Balance Sheet
Accrued expenses	-48,000,000	-30,000,000
Other long-term liabilities	-792,000,000	-507,000,000
Employee Benefit Plans (Textual)
Remeasurement due to plan amendments		371,000,000
Actuarial loss due to changes in discount rates	300,000,000
Actuarial loss due to changes in mortality table	100,000,000
Contributions to defined contribution plans	61,000,000	62,000,000	61,000,000
Pension Plans [Member]
Changes in benefit obligation:
Benefit obligation at beginning of year	1,914,000,000	2,307,000,000
Service cost	120,000,000	137,000,000	140,000,000
Interest cost	91,000,000	86,000,000	93,000,000
Participant contributions	0	0
Plan amendments	2,000,000	-274,000,000
Curtailment gain	0	-6,000,000
Benefits paid	-109,000,000	-170,000,000
Actuarial (gain) loss	440,000,000	-169,000,000
Other	-8,000,000	3,000,000
Benefit obligation at end of year	2,450,000,000	1,914,000,000	2,307,000,000
Changes in plan assets(a):
Fair value of plan assets at beginning of year	1,909,000,000	1,729,000,000
Actual return on plan assets	139,000,000	306,000,000
Valero contributions	46,000,000	41,000,000
Participant contributions	0	0
Benefits paid	-109,000,000	-170,000,000
Other	-7,000,000	3,000,000
Fair value of plan assets at end of year	1,978,000,000	1,909,000,000	1,729,000,000
Reconciliation of funded status (a):
Funded status as of end of year	-472,000,000	-5,000,000
Accumulated benefit obligation	2,354,000,000	1,811,000,000
Defined Benefit Plan, Amounts Recognized in Balance Sheet
Deferred charges and other assets, net	7,000,000	208,000,000
Accrued expenses	-28,000,000	-11,000,000
Other long-term liabilities	-451,000,000	-202,000,000
Amounts recognized in balance sheet for defined benefit plans	-472,000,000	-5,000,000
Employee Benefit Plans (Textual)
Initial effect of defined benefit plan amendment		-328,000,000
Remeasurement due to plan amendments	0	328,000,000	0
Discount rate	4.10%	4.92%
Other Postretirement Benefit Plans [Member]
Changes in benefit obligation:
Benefit obligation at beginning of year	324,000,000	436,000,000
Service cost	7,000,000	12,000,000	12,000,000
Interest cost	15,000,000	18,000,000	21,000,000
Participant contributions	7,000,000	15,000,000
Plan amendments	0	-43,000,000
Curtailment gain	0	0
Benefits paid	-30,000,000	-37,000,000
Actuarial (gain) loss	37,000,000	-77,000,000
Other	1,000,000	0
Benefit obligation at end of year	361,000,000	324,000,000	436,000,000
Changes in plan assets(a):
Fair value of plan assets at beginning of year	0	0
Actual return on plan assets	0	0
Valero contributions	20,000,000	19,000,000
Participant contributions	7,000,000	15,000,000
Benefits paid	-30,000,000	-37,000,000
Other	3,000,000	3,000,000
Fair value of plan assets at end of year	0	0	0
Reconciliation of funded status (a):
Funded status as of end of year	-361,000,000	-324,000,000
Defined Benefit Plan, Amounts Recognized in Balance Sheet
Deferred charges and other assets, net	0	0
Accrued expenses	-20,000,000	-19,000,000
Other long-term liabilities	-341,000,000	-305,000,000
Amounts recognized in balance sheet for defined benefit plans	-361,000,000	-324,000,000
Employee Benefit Plans (Textual)
Initial effect of defined benefit plan amendment		-43,000,000
Remeasurement due to plan amendments	$0	$43,000,000	$0
Discount rate	4.13%	4.88%

Employee_Benefit_Plans_Aggrega

Employee Benefit Plans, Aggregate Projected Benefit Obligation (Details) (Pension Plans [Member], USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Pension Plans [Member]
Information About Pension Plans in which the Accumulated Benefit Obligation Exceeded the Fair Value of Plan Assets
Projected benefit obligation	$2,288	$215
Accumulated benefit obligation	2,217	168
Fair value of plan assets	$1,812	$3

Employee_Benefit_Plans_Benefit

Employee Benefit Plans, Benefit Payments (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014
Pension Plans [Member]
Estimated Future Benefit Payments
2015	$131
2016	127
2017	132
2018	142
2019	189
Years 2020-2024	845
Employee Benefit Plans (Textual)
Future employer contributions to pension and other postretirement plans	47
Other Postretirement Benefit Plans [Member]
Estimated Future Benefit Payments
2015	20
2016	20
2017	21
2018	21
2019	21
Years 2020-2024	108
Employee Benefit Plans (Textual)
Future employer contributions to pension and other postretirement plans	$20

Employee_Benefit_Plans_Compone

Employee Benefit Plans, Components of Net Periodic Benefit Costs (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Employee Benefit Plans (Textual)
The percentage of the higher of the projected benefit obligation or market-related value of plan assets in excess of which net actuarial losses are amortized	10.00%
Pension Plans [Member]
Components of net periodic benefit cost:
Service cost	$120	$137	$140
Interest cost	91	86	93
Expected return on plan assets	-133	-131	-125
Amortization of:
Prior service cost (credit)	-22	-19	3
Net actuarial (gain) loss	35	57	33
Special charges (credits)	3	-5	-3
Net periodic benefit cost	94	125	141
Other Postretirement Benefit Plans [Member]
Components of net periodic benefit cost:
Service cost	7	12	12
Interest cost	15	18	21
Expected return on plan assets	0	0	0
Amortization of:
Prior service cost (credit)	-18	-14	-23
Net actuarial (gain) loss	-1	0	1
Special charges (credits)	0	0	0
Net periodic benefit cost	$3	$16	$11

Employee_Benefit_Plans_Amounts

Employee Benefit Plans, Amounts Recognized in Other Comprehensive Income (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net gain (loss) arising during the year:
Net actuarial gain (loss) arising during the year	($471)	$367	($228)
Prior service cost arising during the year	-1		-9
Remeasurement due to plan amendments		371
Net (gain) loss reclassified into income:
Net actuarial (gain) loss	34	57	34
Prior service cost (credit)	-40	-33	-20
Curtailment and settlement loss	3	1	12
Net gain (loss) on pension and other postretirement benefits, before-tax amount	-475	763	-211
Pension Plans [Member]
Net gain (loss) arising during the year:
Net actuarial gain (loss) arising during the year	-434	290	-245
Prior service cost arising during the year	-1	0	-9
Remeasurement due to plan amendments	0	328	0
Net (gain) loss reclassified into income:
Net actuarial (gain) loss	35	57	33
Prior service cost (credit)	-22	-19	3
Curtailment and settlement loss	3	1	12
Net gain (loss) on pension and other postretirement benefits, before-tax amount	-419	657	-206
Other Postretirement Benefit Plans [Member]
Net gain (loss) arising during the year:
Net actuarial gain (loss) arising during the year	-37	77	17
Prior service cost arising during the year	0	0	0
Remeasurement due to plan amendments	0	43	0
Net (gain) loss reclassified into income:
Net actuarial (gain) loss	-1	0	1
Prior service cost (credit)	-18	-14	-23
Curtailment and settlement loss	0	0	0
Net gain (loss) on pension and other postretirement benefits, before-tax amount	($56)	$106	($5)

Employee_Benefit_Plans_PreTax_

Employee Benefit Plans, Pre-Tax Amounts in Accumulated Other Comprehensive Income (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Pension Plans [Member]
Pension and Other Postretirement Benefit Plans Accumulated Other Comprehensive Income (Loss), before Tax
Prior service credit	($210)	($233)
Net actuarial (gain) loss	876	479
Total	666	246
Other Postretirement Benefit Plans [Member]
Pension and Other Postretirement Benefit Plans Accumulated Other Comprehensive Income (Loss), before Tax
Prior service credit	-92	-110
Net actuarial (gain) loss	-6	-44
Total	($98)	($154)

Employee_Benefit_Plans_Net_Per

Employee Benefit Plans, Net Periodic Benefit Costs Amortized from Accumulated Other Comprehensive Income (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014
Pension Plans [Member]
Pension and Other Postretirement Benefit Plans Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year
Amortization of prior service credit	($22)
Amortization of net actuarial loss	63
Total	41
Other Postretirement Benefit Plans [Member]
Pension and Other Postretirement Benefit Plans Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year
Amortization of prior service credit	-18
Amortization of net actuarial loss	0
Total	($18)

Employee_Benefit_Plans_Weighte

Employee Benefit Plans, Weighted-Average Assumptions (Details)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Minimum [Member]
Employee Benefit Plans (Textual)
Yield curve maturities	6 months
Maximum [Member]
Employee Benefit Plans (Textual)
Yield curve maturities	99 years
Pension Plans [Member]
Weighted Average Assumptions Used to Determine Benefit Obligation
Discount rate	4.10%	4.92%
Rate of compensation increase	3.78%	3.81%
Weighted Average Assumptions Used to Determine Net Periodic Benefit Cost
Discount rate	4.92%	4.33%	5.08%
Expected long-term rate of return on plan assets	7.61%	7.62%	7.67%
Rate of compensation increase	3.81%	3.73%	3.68%
Other Postretirement Benefit Plans [Member]
Weighted Average Assumptions Used to Determine Benefit Obligation
Discount rate	4.13%	4.88%
Rate of compensation increase	0.00%	0.00%
Weighted Average Assumptions Used to Determine Net Periodic Benefit Cost
Discount rate	4.88%	4.19%	4.97%
Expected long-term rate of return on plan assets	0.00%	0.00%	0.00%
Rate of compensation increase	0.00%	0.00%	0.00%

Employee_Benefit_Plans_Health_

Employee Benefit Plans, Health Care Cost Trend Rate (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Assumed Health Care Cost Trend Rates
Health care cost trend rate assumed for the next year	7.36%	7.39%
Rate to which the cost trend rate was assumed to decline (the ultimate trend rate)	5.00%	5.00%
Year that the rate reaches the ultimate trend rate	2020	2020
Effect of One Percentage-Point Change in Assumed Health Care Cost Trend Rates
Effect on total of service and interest cost components, increase	$0
Effect on total of service and interest cost components, decrease	0
Effect on accumulated postretirement benefit obligation, increase	5
Effect on accumulated postretirement benefit obligation, decrease	($4)

Employee_Benefit_Plans_Fair_Va

Employee Benefit Plans, Fair Value of Assets Qualified Plans (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013
Fair Values of Qualified Pension Plan Assets
Fair value of qualified pension plan assets	1,978		$1,909
Fair Value, Inputs, Level 1 [Member]
Fair Values of Qualified Pension Plan Assets
Fair value of qualified pension plan assets	1,155		1,135
Fair Value, Inputs, Level 2 [Member]
Fair Values of Qualified Pension Plan Assets
Fair value of qualified pension plan assets	823		774
Fair Value, Inputs, Level 3 [Member]
Fair Values of Qualified Pension Plan Assets
Fair value of qualified pension plan assets	0		0
Other US Companies [Member]
Fair Values of Qualified Pension Plan Assets
Fair value of qualified pension plan assets	541	[1]	529	[1]
Other US Companies [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Values of Qualified Pension Plan Assets
Fair value of qualified pension plan assets	541	[1]	529	[1]
Other US Companies [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Values of Qualified Pension Plan Assets
Fair value of qualified pension plan assets	0	[1]	0	[1]
Other US Companies [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Values of Qualified Pension Plan Assets
Fair value of qualified pension plan assets	0	[1]	0	[1]
International Companies [Member]
Fair Values of Qualified Pension Plan Assets
Fair value of qualified pension plan assets	144		155
International Companies [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Values of Qualified Pension Plan Assets
Fair value of qualified pension plan assets	144		155
International Companies [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Values of Qualified Pension Plan Assets
Fair value of qualified pension plan assets	0		0
International Companies [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Values of Qualified Pension Plan Assets
Fair value of qualified pension plan assets	0		0
Preferred Stock [Member]
Fair Values of Qualified Pension Plan Assets
Fair value of qualified pension plan assets	2		3
Preferred Stock [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Values of Qualified Pension Plan Assets
Fair value of qualified pension plan assets	1		2
Preferred Stock [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Values of Qualified Pension Plan Assets
Fair value of qualified pension plan assets	1		1
Preferred Stock [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Values of Qualified Pension Plan Assets
Fair value of qualified pension plan assets	0		0
International Growth [Member]
Fair Values of Qualified Pension Plan Assets
Fair value of qualified pension plan assets	119		131
International Growth [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Values of Qualified Pension Plan Assets
Fair value of qualified pension plan assets	119		131
International Growth [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Values of Qualified Pension Plan Assets
Fair value of qualified pension plan assets	0		0
International Growth [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Values of Qualified Pension Plan Assets
Fair value of qualified pension plan assets	0		0
Index Funds [Member]
Fair Values of Qualified Pension Plan Assets
Fair value of qualified pension plan assets	199	[2]	160	[2]
Index Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Values of Qualified Pension Plan Assets
Fair value of qualified pension plan assets	199	[2]	160	[2]
Index Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Values of Qualified Pension Plan Assets
Fair value of qualified pension plan assets	0	[2]	0	[2]
Index Funds [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Values of Qualified Pension Plan Assets
Fair value of qualified pension plan assets	0	[2]	0	[2]
Corporate Debt Instruments [Member]
Fair Values of Qualified Pension Plan Assets
Fair value of qualified pension plan assets	263		260
Corporate Debt Instruments [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Values of Qualified Pension Plan Assets
Fair value of qualified pension plan assets	0		0
Corporate Debt Instruments [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Values of Qualified Pension Plan Assets
Fair value of qualified pension plan assets	263		260
Corporate Debt Instruments [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Values of Qualified Pension Plan Assets
Fair value of qualified pension plan assets	0		0
US Treasury Securities [Member]
Fair Values of Qualified Pension Plan Assets
Fair value of qualified pension plan assets	71		81
US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Values of Qualified Pension Plan Assets
Fair value of qualified pension plan assets	71		81
US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Values of Qualified Pension Plan Assets
Fair value of qualified pension plan assets	0		0
US Treasury Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Values of Qualified Pension Plan Assets
Fair value of qualified pension plan assets	0		0
Other Government Securities [Member]
Fair Values of Qualified Pension Plan Assets
Fair value of qualified pension plan assets	100		79
Other Government Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Values of Qualified Pension Plan Assets
Fair value of qualified pension plan assets	0		0
Other Government Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Values of Qualified Pension Plan Assets
Fair value of qualified pension plan assets	100		79
Other Government Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Values of Qualified Pension Plan Assets
Fair value of qualified pension plan assets	0		0
Common Collective Trusts [Member]
Fair Values of Qualified Pension Plan Assets
Fair value of qualified pension plan assets	379		373
Common Collective Trusts [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Values of Qualified Pension Plan Assets
Fair value of qualified pension plan assets	0		0
Common Collective Trusts [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Values of Qualified Pension Plan Assets
Fair value of qualified pension plan assets	379		373
Common Collective Trusts [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Values of Qualified Pension Plan Assets
Fair value of qualified pension plan assets	0		0
Private Fund [Member]
Fair Values of Qualified Pension Plan Assets
Fair value of qualified pension plan assets	40		38
Private Fund [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Values of Qualified Pension Plan Assets
Fair value of qualified pension plan assets	0		0
Private Fund [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Values of Qualified Pension Plan Assets
Fair value of qualified pension plan assets	40		38
Private Fund [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Values of Qualified Pension Plan Assets
Fair value of qualified pension plan assets	0		0
Insurance Contracts [Member]
Fair Values of Qualified Pension Plan Assets
Fair value of qualified pension plan assets	18		17
Insurance Contracts [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Values of Qualified Pension Plan Assets
Fair value of qualified pension plan assets	0		0
Insurance Contracts [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Values of Qualified Pension Plan Assets
Fair value of qualified pension plan assets	18		17
Insurance Contracts [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Values of Qualified Pension Plan Assets
Fair value of qualified pension plan assets	0		0
Interest and Dividends Receivable [Member]
Fair Values of Qualified Pension Plan Assets
Fair value of qualified pension plan assets	5		5
Interest and Dividends Receivable [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Values of Qualified Pension Plan Assets
Fair value of qualified pension plan assets	5		5
Interest and Dividends Receivable [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Values of Qualified Pension Plan Assets
Fair value of qualified pension plan assets	0		0
Interest and Dividends Receivable [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Values of Qualified Pension Plan Assets
Fair value of qualified pension plan assets	0		0
Cash and Cash Equivalents [Member]
Fair Values of Qualified Pension Plan Assets
Fair value of qualified pension plan assets	97		78
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Values of Qualified Pension Plan Assets
Fair value of qualified pension plan assets	75		72
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Values of Qualified Pension Plan Assets
Fair value of qualified pension plan assets	22		6
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Values of Qualified Pension Plan Assets
Fair value of qualified pension plan assets	0		$0
Equity Securities [Member]
Employee Benefit Plans (Textual)
Defined benefit plan, actual plan asset allocations	60.00%
Percentage of equity securities in target allocations for plan assets	70.00%
Debt Securities [Member]
Employee Benefit Plans (Textual)
Defined benefit plan, actual plan asset allocations	40.00%
Percentage of equity securities in target allocations for plan assets	30.00%
[1]	Equity securities are held in a wide range of industrial sectors, including consumer goods, information technology, healthcare, industrials, and financial services.
[2]	This class includes primarily investments in approximately 60 percent equities and 40 percent bonds.

StockBased_Compensation_Detail

Stock-Based Compensation (Details) (USD $)	12 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Stock-based Compensation Arrangements Activity
Stock-based compensation expense	$60	$64	$58
Tax benefit recognized on stock-based compensation expense	21	22	20
Tax benefit realized for tax deductions resulting from exercises and vestings	64	66	45
Effect of tax deductions in excess of recognized stock-based compensation expense reported as a financing cash flow	47	47	27
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding Rollforward
Stock options outstanding as of beginning of year	8,558,093
Number of stock options, granted	126,095
Number of stock options, exercised	-2,564,125
Number of stock options, expired	-1,449,986
Number of stock options, forfeited	-856
Stock options outstanding as of end of year	4,669,221	8,558,093
Number of stock options, exercisable as of December 31, 2014	4,315,414
Weighted-average exercise price per share outstanding, beginning balance	$27.88
Weighted-average exercise price per share, granted	$48.57
Weighted-average exercise price per share, exercised	$18.64
Weighted-average exercise price per share, expired	$66.67
Weighted average exercise price per share, forfeited	$17.68
Weighted-average exercise price per share outstanding, ending balance	$21.48	$27.88
Weighted-average exercise price per share, exercisable as of December 31, 2014	$19.99
Weighted-average remaining contractual term, outstanding as of December 31, 2014	4 years 6 months
Weighted-average remaining contractual term, exercisable as of December 31, 2014	4 years 2 months
Aggregate intrinsic value, outstanding as of December 31, 2014	131
Aggregate intrinsic value, exercisable as of December 31, 2014	127
Nonvested Shares or Awards Other Than Options Rollforward
Shares or awards, granted	225,829
Employee Stock Option [Member]
Summary of Weighted-Average Assumptions Used in Fair Value Measurements
Expected life in years	6 years	6 years	6 years
Expected volatility	43.21%	49.63%	49.11%
Expected dividend yield	2.27%	2.27%	2.39%
Risk-free interest rate	1.74%	1.77%	0.85%
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding Rollforward
Weighted average grant date fair value of stock option	$17.31	$15.83	$10.98
Intrinsic value of stock options exercised	85	101	78
Cash received from exercise of stock options	47	59	59
Stock Based Compensation (Textual)
Vesting period of stock-based payment awards granted	3 years
Unrecognized share-based compensation cost related to outstanding unvested awards	1
Weighted-average period of recognition for unrecognized compensation costs on nonvested awards	2 years
Employee Stock Option [Member] | Minimum [Member]
Stock Based Compensation (Textual)
Expiration period of stock-based compensation awards	7 years
Employee Stock Option [Member] | Maximum [Member]
Stock Based Compensation (Textual)
Expiration period of stock-based compensation awards	10 years
Restricted Stock Awards - Nonemployee [Member]
Stock Based Compensation (Textual)
Vesting period of stock-based payment awards granted	3 years
Restricted Stock [Member]
Nonvested Shares or Awards Other Than Options Rollforward
Nonvested shares or awards, beginning balance	2,205,314
Shares or awards, granted	969,671
Awards, vested	-1,402,753
Shares or awards, forfeited	-14,082
Nonvested shares or awards, ending balance	1,758,150	2,205,314
Nonvested Awards Other Than Options Weighted Average Grant Date Fair Value Rollforward
Weighted average grant date fair value, beginning balance	$32.23
Weighted average grant date fair value, granted	$49.40
Weighted average grant date fair value, vested	$31.90
Weighted average grant date fair value, forfeited	$32.56
Weighted average grant date fair value, ending balance	$41.96	$32.23
Stock Based Compensation (Textual)
Vesting period of stock-based payment awards granted	3 years
Unrecognized share-based compensation cost related to outstanding unvested awards	45
Weighted-average period of recognition for unrecognized compensation costs on nonvested awards	2 years
Total fair value of restricted stock vested	60	74	47
Performance Awards [Member]
Nonvested Shares or Awards Other Than Options Rollforward
Nonvested shares or awards, beginning balance	947,165
Shares or awards, granted	225,829
Awards, vested	-534,028
Shares or awards, forfeited	-24,576
Nonvested shares or awards, ending balance	614,390	947,165
Vested Awards Other Than Options Rollforward
Vested awards, beginning balance	0
Awards, vested	534,028
Awards, converted	-534,028
Awards, forfeited	0
Vested awards, ending balance	0	0
Performance Awards Converted [Abstract]
Vested awards converted	534,028
Converted shares issued	866,634
Stock Based Compensation (Textual)
Vesting period of stock-based payment awards granted	1 year
Unrecognized share-based compensation cost related to outstanding unvested awards	11
Total fair value of restricted stock vested	$15	$12	$3
Performance award vesting rights	33.33%
Number of vesting tranches under performance awards granted	3
Performance Awards [Member] | Award Year 2010 [Member]
Performance Awards Converted [Abstract]
Vested awards converted	201,422
Actual conversion rate of common shares	100.00%
Converted shares issued	201,422
Performance Awards [Member] | Award Year 2011 [Member]
Performance Awards Converted [Abstract]
Vested awards converted	227,571
Actual conversion rate of common shares	200.00%
Converted shares issued	455,142
Performance Awards [Member] | Award Year 2012 [Member]
Performance Awards Converted [Abstract]
Vested awards converted	102,855
Actual conversion rate of common shares	200.00%
Converted shares issued	205,710
Performance Awards [Member] | Award Year 2012 [Member] | Share-based Compensation Award, Tranche Three [Member]
Nonvested Shares or Awards Other Than Options Rollforward
Shares or awards, granted	99,023
Nonvested Awards Other Than Options Weighted Average Grant Date Fair Value Rollforward
Weighted average grant date fair value, granted	$47.47
Expected conversion rate of common stock shares	1
Performance Awards [Member] | Award Year 2013 [Member]
Performance Awards Converted [Abstract]
Vested awards converted	2,180
Actual conversion rate of common shares	200.00%
Converted shares issued	4,360
Performance Awards [Member] | Award Year 2013 [Member] | Share-based Compensation Award, Tranche Two [Member]
Nonvested Shares or Awards Other Than Options Rollforward
Shares or awards, granted	76,232
Nonvested Awards Other Than Options Weighted Average Grant Date Fair Value Rollforward
Weighted average grant date fair value, granted	$47.47
Expected conversion rate of common stock shares	1
Performance Awards [Member] | Award Year 2014 [Member] | Share-based Compensation Award, Tranche One [Member]
Nonvested Shares or Awards Other Than Options Rollforward
Shares or awards, granted	50,574
Nonvested Awards Other Than Options Weighted Average Grant Date Fair Value Rollforward
Weighted average grant date fair value, granted	$48.57
Expected conversion rate of common stock shares	1
Performance Awards [Member] | Minimum [Member]
Stock Based Compensation (Textual)
Performance awards range of conversion rates	0.00%
Performance Awards [Member] | Maximum [Member]
Stock Based Compensation (Textual)
Performance awards range of conversion rates	200.00%
Omnibus Stock Incentive Plan [Member] | Stock Compensation Plan [Member]
Stock Based Compensation (Textual)
Number of shares of common stock available to be awarded under stock-based compensation plans	13,536,081
Formerly Maintained Plans [Member] | Stock Compensation Plan [Member]
Stock Based Compensation (Textual)
Number of shares of common stock available to be awarded under stock-based compensation plans	0

Income_Taxes_Details

Income Taxes (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income from Continuing Operations Before Income Tax Expense from Domestic and Foreign Operations
U.S. operations	$4,677,000,000	$3,531,000,000	$4,015,000,000
International operations	875,000,000	445,000,000	725,000,000
Income from continuing operations before income tax expense	5,552,000,000	3,976,000,000	4,740,000,000
Reconciliation of Income Tax Expense Related to Income from Continuing Operations Before Income Tax Expense
Federal income tax expense at the U.S. federal statutory rate	1,943,000,000	1,392,000,000	1,659,000,000
U.S. state income tax expense, net of U.S. federal income tax effect	62,000,000	62,000,000	64,000,000
U.S. manufacturing deduction	-74,000,000	-36,000,000	-33,000,000
International operations	-88,000,000	-69,000,000	-96,000,000
Permanent differences	-16,000,000	-104,000,000	20,000,000
Change in tax law	0	-32,000,000	0
Other, net	-50,000,000	41,000,000	12,000,000
Income tax expense	1,777,000,000	1,254,000,000	1,626,000,000
Current:
U.S. federal	1,196,000,000	635,000,000	515,000,000
U.S. state	59,000,000	36,000,000	22,000,000
International	77,000,000	82,000,000	126,000,000
Total current	1,332,000,000	753,000,000	663,000,000
Deferred:
U.S. federal	268,000,000	459,000,000	854,000,000
U.S. state	36,000,000	59,000,000	77,000,000
International	141,000,000	-17,000,000	32,000,000
Total deferred	445,000,000	501,000,000	963,000,000
Income tax expense	1,777,000,000	1,254,000,000	1,626,000,000
Deferred income tax assets:
Tax credit carryforwards	37,000,000	48,000,000
Net operating losses (NOLs)	436,000,000	338,000,000
Inventories	160,000,000	264,000,000
Property, plant, and equipment	0	8,000,000
Compensation and employee benefit liabilities	358,000,000	178,000,000
Environmental liabilities	92,000,000	92,000,000
Other	178,000,000	187,000,000
Total deferred income tax assets	1,261,000,000	1,115,000,000
Less: Valuation allowance	-393,000,000	-347,000,000
Net deferred income tax assets	868,000,000	768,000,000
Deferred income tax liabilities:
Property, plant, and equipment	6,682,000,000	6,536,000,000
Deferred turnaround costs	356,000,000	331,000,000
Inventories	426,000,000	310,000,000
Investments	152,000,000	94,000,000
Other	73,000,000	81,000,000
Total deferred income tax liabilities	7,689,000,000	7,352,000,000
Net deferred income tax liabilities	6,821,000,000	6,584,000,000
Valuation Allowance Allocation
Deferred tax assets valuation allowance	393,000,000	347,000,000
Reconciliation of the Change in Unrecognized Tax Benefits RollForward
Balance as of beginning of year	950,000,000	341,000,000	326,000,000
Additions based on tax positions related to the current year	35,000,000	64,000,000	11,000,000
Additions for tax positions related to prior years	118,000,000	576,000,000	40,000,000
Reductions for tax positions related to prior years	-67,000,000	-26,000,000	-36,000,000
Reductions for tax positions related to the lapse of applicable statute of limitations	-1,000,000	-4,000,000	0
Settlements	-46,000,000	-1,000,000	0
Balance as of end of year	989,000,000	950,000,000	341,000,000
Reconciliation of Unrecognized Tax Benefits to Uncertain Tax Position Liabilities
Unrecognized tax benefits	989,000,000	950,000,000	341,000,000
Tax refund claim not recognized in our financial statements	-118,000,000	-576,000,000	-40,000,000
Penalties, interest (net of U.S. federal and state income tax effect), and the U.S. federal income tax effect of state unrecognized tax benefits	49,000,000	49,000,000
Uncertain tax position liabilities	484,000,000	443,000,000
Income Taxes (Textual)
Statutory federal income tax rate	35.00%	35.00%	35.00%
Gain on disposition of retained interest in CST Brands, Inc.	0	325,000,000	0
Income tax benefit related to discontinued operations	0	0	0
Increase in valuation allowance	46,000,000
Cumulative undistributed earnings of foreign subsidiaries	2,900,000,000
Additions for tax positions related to prior years	118,000,000	576,000,000	40,000,000
Income tax benefits if recognized that would impact the effective tax rate	768,000,000	763,000,000
Possible reduction to unrecognized tax benefit	133,000,000
Interest expense and penalties recognized		12,000,000	23,000,000
Interest expense and penalties accrued	141,000,000	145,000,000
Tax Years 2005 to 2012 [Member]
Reconciliation of the Change in Unrecognized Tax Benefits RollForward
Additions for tax positions related to prior years	554,000,000	556,000,000
Reconciliation of Unrecognized Tax Benefits to Uncertain Tax Position Liabilities
Tax refund claim not recognized in our financial statements	-554,000,000	-556,000,000
Income Taxes (Textual)
Additions for tax positions related to prior years	554,000,000	556,000,000
Consolidated Statement Of Income [Member]
Deferred income tax assets:
Less: Valuation allowance	-386,000,000
Valuation Allowance Allocation
Deferred tax assets valuation allowance	386,000,000
Additional Paid-in Capital [Member]
Deferred income tax assets:
Less: Valuation allowance	-7,000,000
Valuation Allowance Allocation
Deferred tax assets valuation allowance	7,000,000
State and Local Jurisdiction [Member]
Income Tax Credit and Loss Carryforwards
NOL	6,574,000,000
State and Local Jurisdiction [Member] | Minimum [Member]
Income Tax Credit and Loss Carryforwards
NOL, expiration	31-Dec-15
State and Local Jurisdiction [Member] | Maximum [Member]
Income Tax Credit and Loss Carryforwards
NOL, expiration	31-Dec-34
State and Local Jurisdiction [Member] | U S State Income Tax Credits Limited [Member]
Income Tax Credit and Loss Carryforwards
U.S. state income tax credits	53,000,000
State and Local Jurisdiction [Member] | U S State Income Tax Credits Limited [Member] | Minimum [Member]
Income Tax Credit and Loss Carryforwards
Income tax credits, expiration	31-Dec-15
State and Local Jurisdiction [Member] | U S State Income Tax Credits Limited [Member] | Maximum [Member]
Income Tax Credit and Loss Carryforwards
Income tax credits, expiration	31-Dec-27
Foreign Tax Authority [Member]
Income Tax Credit and Loss Carryforwards
NOL	$1,630,000,000

Earnings_Per_Common_Share_Deta

Earnings Per Common Share (Details) (USD $)	12 Months Ended
In Millions, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Earnings per common share from continuing operations:
Net income attributable to Valero stockholders from continuing operations	$3,694	$2,714	$3,117
Less dividends paid:
Weighted-average common shares outstanding (in millions)	526	542	550
Earnings per common share from continuing operations:
Total earnings per common share from continuing operations	$7	$4.98	$5.64
Earnings per common share from continuing operations – assuming dilution:
Net income attributable to Valero stockholders from continuing operations	3,694	2,714	3,117
Weighted-average common shares outstanding (in millions)	526	542	550
Common equivalent shares:
Weighted-average common shares outstanding – assuming dilution (in millions)	530	548	556
Earnings per common share from continuing operations – assuming dilution (in usd per share)	$6.97	$4.96	$5.61
Common Stock [Member]
Earnings per common share from continuing operations:
Net income attributable to Valero stockholders from continuing operations	3,694	2,714	3,117
Less dividends paid:
Common stock	552	460	358
Nonvested restricted stock	2	2	2
Undistributed earnings	3,140	2,252	2,757
Weighted-average common shares outstanding (in millions)	526	542	550
Earnings per common share from continuing operations:
Distributed earnings (in usd per share)	$1.05	$0.85	$0.65
Undistributed earnings (in usd per share)	$5.95	$4.13	$4.99
Total earnings per common share from continuing operations	$7	$4.98	$5.64
Earnings per common share from continuing operations – assuming dilution:
Net income attributable to Valero stockholders from continuing operations	$3,694	$2,714	$3,117
Weighted-average common shares outstanding (in millions)	526	542	550
Common equivalent shares:
Stock options (in shares)	2	4	4
Performance awards and nonvested restricted stock (in shares)	2	2	2
Weighted-average common shares outstanding – assuming dilution (in millions)	530	548	556
Earnings per common share from continuing operations – assuming dilution (in usd per share)	$6.97	$4.96	$5.61
Restricted Stock [Member]
Less dividends paid:
Weighted-average common shares outstanding (in millions)	2	3	3
Earnings per common share from continuing operations:
Distributed earnings (in usd per share)	$1.05	$0.85	$0.65
Undistributed earnings (in usd per share)	$5.95	$4.13	$4.99
Total earnings per common share from continuing operations	$7	$4.98	$5.64
Earnings per common share from continuing operations – assuming dilution:
Weighted-average common shares outstanding (in millions)	2	3	3

Segment_Information_Details

Segment Information (Details) (USD $)	3 Months Ended									12 Months Ended			1 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013		Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Mar. 31, 2014
										segments
Segment information for our three reportable segments
Operating revenues	$27,859	$34,408	$34,914	$33,663	$34,429	$36,137	$34,034	[1]	$33,474	$130,844	$138,074	$138,393
Depreciation and amortization expense										1,690	1,720	1,549
Operating income (loss)	1,796	1,670	1,085	1,351	1,562	532	805	[1]	1,058	5,902	3,957	5,044
Total expenditures for long-lived assets										2,822	2,757	3,413
Segment Information (Textual)
Number of reportable segments										2
Mount Vernon Ethanol Plant [Member]
Segment Information (Textual)
Payments to acquire idled corn ethanol plant													34
Refining [Member]
Segment information for our three reportable segments
Operating revenues										126,004	129,064	122,068
Ethanol [Member]
Segment information for our three reportable segments
Operating revenues										4,840	5,114	4,317
Retail [Member]
Segment information for our three reportable segments
Operating revenues										0	3,896	12,008
Corporate, Non-Segment [Member] | Corporate and Other [Member]
Segment information for our three reportable segments
Operating revenues										0	0	0
Depreciation and amortization expense										44	68	43
Operating income (loss)										-768	-826	-741
Total expenditures for long-lived assets										30	65	66
Operating Segments [Member] | Refining [Member]
Segment information for our three reportable segments
Operating revenues										126,004	129,064	122,068
Depreciation and amortization expense										1,597	1,566	1,345
Operating income (loss)										5,884	4,211	5,484
Total expenditures for long-lived assets										2,750	2,597	3,147
Operating Segments [Member] | Ethanol [Member]
Segment information for our three reportable segments
Operating revenues										4,840	5,114	4,317
Depreciation and amortization expense										49	45	42
Operating income (loss)										786	491	-47
Total expenditures for long-lived assets										42	33	36
Operating Segments [Member] | Retail [Member]
Segment information for our three reportable segments
Operating revenues										0	3,896	12,008
Depreciation and amortization expense										0	41	119
Operating income (loss)										0	81	348
Total expenditures for long-lived assets										0	62	164
Intersegment Eliminations [Member]
Segment information for our three reportable segments
Operating revenues										100	3,004	9,061
Intersegment Eliminations [Member] | Refining [Member]
Segment information for our three reportable segments
Operating revenues										0	2,876	8,946
Intersegment Eliminations [Member] | Ethanol [Member]
Segment information for our three reportable segments
Operating revenues										100	128	115
Intersegment Eliminations [Member] | Retail [Member]
Segment information for our three reportable segments
Operating revenues										$0	$0	$0
[1]	The separation of our retail business was completed on May 1, 2013.

Segment_Information_Revenue_by

Segment Information, Revenue by Product (Details) (USD $)	3 Months Ended									12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013		Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenue from External Customer [Line Items]
Operating revenues	$27,859	$34,408	$34,914	$33,663	$34,429	$36,137	$34,034	[1]	$33,474	$130,844	$138,074	$138,393
Refining [Member]
Revenue from External Customer [Line Items]
Operating revenues										126,004	129,064	122,068
Refining [Member] | Gasoline and Blendstocks [Member]
Revenue from External Customer [Line Items]
Operating revenues										56,846	57,806	55,647
Refining [Member] | Distillates [Member]
Revenue from External Customer [Line Items]
Operating revenues										57,521	56,921	51,095
Refining [Member] | Petrochemicals [Member]
Revenue from External Customer [Line Items]
Operating revenues										3,759	4,281	3,908
Refining [Member] | Lubes and Asphalts [Member]
Revenue from External Customer [Line Items]
Operating revenues										1,397	1,643	2,033
Refining [Member] | Other Product Revenues [Member]
Revenue from External Customer [Line Items]
Operating revenues										6,481	8,413	9,385
Ethanol [Member]
Revenue from External Customer [Line Items]
Operating revenues										4,840	5,114	4,317
Ethanol [Member] | Ethanol Product [Member]
Revenue from External Customer [Line Items]
Operating revenues										4,192	4,245	3,545
Ethanol [Member] | Distillers Grains [Member]
Revenue from External Customer [Line Items]
Operating revenues										648	869	772
Retail [Member]
Revenue from External Customer [Line Items]
Operating revenues										0	3,896	12,008
Retail [Member] | Fuel Sales Gasoline and Diesel [Member]
Revenue from External Customer [Line Items]
Operating revenues										0	3,226	10,045
Retail [Member] | Merchandise Sales and Other [Member]
Revenue from External Customer [Line Items]
Operating revenues										0	524	1,649
Retail [Member] | Heating Oil [Member]
Revenue from External Customer [Line Items]
Operating revenues										$0	$146	$314
[1]	The separation of our retail business was completed on May 1, 2013.

Segment_Information_Geographic

Segment Information, Geographic Information by Country for Revenue and Long-Lived Assets (Details) (USD $)	3 Months Ended									12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013		Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating revenues by geographic area
Operating revenues	$27,859	$34,408	$34,914	$33,663	$34,429	$36,137	$34,034	[1]	$33,474	$130,844	$138,074	$138,393
Geographic information by country for long-lived assets
Long-lived assets	28,247				27,059					28,247	27,059
U.S. [Member]
Operating revenues by geographic area
Operating revenues										91,499	100,418	99,879
Geographic information by country for long-lived assets
Long-lived assets	24,710				23,572					24,710	23,572
Canada [Member]
Operating revenues by geographic area
Operating revenues										10,410	9,974	10,376
Geographic information by country for long-lived assets
Long-lived assets	2,250				2,260					2,250	2,260
U. K. and Ireland [Member]
Operating revenues by geographic area
Operating revenues										14,182	13,675	12,818
U.K. [Member]
Geographic information by country for long-lived assets
Long-lived assets	1,206				1,148					1,206	1,148
Other countries [Member]
Operating revenues by geographic area
Operating revenues										14,753	14,007	15,320
Aruba [Member]
Geographic information by country for long-lived assets
Long-lived assets	59				53					59	53
Ireland [Member]
Geographic information by country for long-lived assets
Long-lived assets	$22				$26					$22	$26
[1]	The separation of our retail business was completed on May 1, 2013.

Segment_Information_Total_Asse

Segment Information, Total Assets by Reportable Segments (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Total assets by reportable segments
Reportable segment assets	$45,550	$47,260
Refining [Member]
Total assets by reportable segments
Reportable segment assets	40,103	41,227
Ethanol [Member]
Total assets by reportable segments
Reportable segment assets	954	889
Corporate and Other [Member]
Total assets by reportable segments
Reportable segment assets	$4,493	$5,144

Supplemental_Cash_Flow_Informa2

Supplemental Cash Flow Information (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Decrease (increase) in current assets:
Receivables, net	$2,753	($753)	$437
Inventories	-1,014	-13	-282
Income taxes receivable	-23	10	51
Prepaid expenses and other	-32	2	-28
Increase (decrease) in current liabilities:
Accounts payable	-3,149	977	-113
Accrued expenses	38	53	13
Taxes other than income taxes	-64	337	-260
Income taxes payable	-319	309	-120
Changes in current assets and current liabilities	-1,810	922	-302
Cash Flows Related to Interest and Income Taxes
Interest paid in excess of amount capitalized	392	361	302
Income taxes paid, net	$1,624	$387	$705

Fair_Value_Measurements_Recurr

Fair Value Measurements, Recurring (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Assets:
Investments of certain benefit plans	$1,978	$1,909
Fair Value, Measurements, Recurring [Member]
Assets:
Commodity derivative contracts	3,132	537
Physical purchase contracts	1
Investments of certain benefit plans	108	109
Total gross fair value, assets	3,241	646
Effect of Counterparty Netting	-2,907	-505
Effect of Cash Collateral Netting	-99	-7
Commodity derivative contracts, net assets	126	25
Net Carrying Value on Balance Sheet, Assets	235	134
Cash Collateral Received Not Offset	0	0
Liabilities:
Commodity derivative contracts	2,920	516
Biofuels blending obligation	14	11
Physical purchase contracts	5	5
Foreign currency contracts		8
Total gross fair value, liabilities	2,939	540
Effect of Counterparty Netting	-2,907	-505
Effect of Cash Collateral Netting	-13	-6
Commodity derivative contracts, net liabilities	0	5
Net Carrying Value on Balance Sheet, Liabilities	19	29
Cash Collateral Paid Not Offset	-25	-76
Fair Value, Inputs, Level 1 [Member]
Assets:
Investments of certain benefit plans	1,155	1,135
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Commodity derivative contracts	3,096	499
Physical purchase contracts	0
Investments of certain benefit plans	97	98
Total gross fair value, assets	3,193	597
Liabilities:
Commodity derivative contracts	2,886	492
Biofuels blending obligation	0	0
Physical purchase contracts	0	0
Foreign currency contracts		8
Total gross fair value, liabilities	2,886	500
Fair Value, Inputs, Level 2 [Member]
Assets:
Investments of certain benefit plans	823	774
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Commodity derivative contracts	36	38
Physical purchase contracts	1
Investments of certain benefit plans	0	0
Total gross fair value, assets	37	38
Liabilities:
Commodity derivative contracts	34	24
Biofuels blending obligation	14	11
Physical purchase contracts	5	5
Foreign currency contracts		0
Total gross fair value, liabilities	53	40
Fair Value, Inputs, Level 3 [Member]
Assets:
Investments of certain benefit plans	0	0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Commodity derivative contracts	0	0
Physical purchase 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	0
Physical purchase contracts	0	0
Foreign currency contracts		0
Total gross fair value, liabilities	$0	$0

Fair_Value_Measurements_Level_

Fair Value Measurements, Level 3 Reconciliation (Details) (Fair Value, Measurements, Recurring [Member], USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Fair Value Measurements (Textual)
Activity related to fair value amounts categorized in level 3	$0	$0	$0

Fair_Value_Measurements_Nonrec

Fair Value Measurements, Nonrecurring (Details) (Fair Value, Measurements, Nonrecurring [Member], USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Fair Value, Measurements, Nonrecurring [Member]
Fair Value Measurements (Textual)
Assets measured at fair value, nonrecurring	$0	$0
Liabilities measured at fair value, nonrecurring	$0	$0

Fair_Value_Measurements_Other_

Fair Value Measurements, Other Financial Instruments (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
In Millions, unless otherwise specified
Financial assets:
Cash and temporary cash investments, at carrying amount	$3,689	$4,292	$1,723	$1,024
Financial liabilities:
Debt (excluding capital leases), at carrying amount	6,354	6,525
Fair Value, Inputs, Level 1 [Member]
Financial assets:
Cash and temporary cash investments, at fair value	3,689	4,292
Fair Value, Inputs, Level 2 [Member]
Financial liabilities:
Debt (excluding capital leases), at fair value	$7,562	$7,659

Price_Risk_Management_Activiti2

Price Risk Management Activities (Details) (USD $)	12 Months Ended			1 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jan. 31, 2015
Price Risk Management Activities (Textual)
Compliance program costs	$372	$517	$250
Foreign Currency Contract [Member]
Price Risk Management Activities (Textual)
Monetary notional amount of derivative liabilities	377
Foreign Currency Contract [Member] | Subsequent Event [Member]
Price Risk Management Activities (Textual)
Foreign currency commitments maturity date				31-Jan-15
Gain (loss) recognized in income on derivatives				$12
Fair Value Hedging [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives	0
Cash Flow Hedging [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives	0
Economic Hedging [Member] | Swap [Member] | Long (Purchases) [Member] | Maturity Year Two [Member] | Crude Oil (In thousands of barrels) [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives	7,532
Economic Hedging [Member] | Swap [Member] | Long (Purchases) [Member] | Maturity Year Three [Member] | Crude Oil (In thousands of barrels) [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives	0
Economic Hedging [Member] | Swap [Member] | Short (Sales) [Member] | Maturity Year Two [Member] | Crude Oil (In thousands of barrels) [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives	5,676
Economic Hedging [Member] | Swap [Member] | Short (Sales) [Member] | Maturity Year Three [Member] | Crude Oil (In thousands of barrels) [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives	0
Economic Hedging [Member] | Future [Member] | Long (Purchases) [Member] | Maturity Year Two [Member] | Crude Oil (In thousands of barrels) [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives	46,886
Economic Hedging [Member] | Future [Member] | Long (Purchases) [Member] | Maturity Year Two [Member] | Grain (In bushels) [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives	20,815,000
Economic Hedging [Member] | Future [Member] | Long (Purchases) [Member] | Maturity Year Two [Member] | Soybean Oil (in pounds) [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives	94,920,000
Economic Hedging [Member] | Future [Member] | Long (Purchases) [Member] | Maturity Year Three [Member] | Crude Oil (In thousands of barrels) [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives	0
Economic Hedging [Member] | Future [Member] | Long (Purchases) [Member] | Maturity Year Three [Member] | Grain (In bushels) [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives	80,000
Economic Hedging [Member] | Future [Member] | Long (Purchases) [Member] | Maturity Year Three [Member] | Soybean Oil (in pounds) [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives	0
Economic Hedging [Member] | Future [Member] | Short (Sales) [Member] | Maturity Year Two [Member] | Crude Oil (In thousands of barrels) [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives	67,600
Economic Hedging [Member] | Future [Member] | Short (Sales) [Member] | Maturity Year Two [Member] | Grain (In bushels) [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives	46,585,000
Economic Hedging [Member] | Future [Member] | Short (Sales) [Member] | Maturity Year Two [Member] | Soybean Oil (in pounds) [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives	178,920,000
Economic Hedging [Member] | Future [Member] | Short (Sales) [Member] | Maturity Year Three [Member] | Crude Oil (In thousands of barrels) [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives	0
Economic Hedging [Member] | Future [Member] | Short (Sales) [Member] | Maturity Year Three [Member] | Grain (In bushels) [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives	1,155,000
Economic Hedging [Member] | Future [Member] | Short (Sales) [Member] | Maturity Year Three [Member] | Soybean Oil (in pounds) [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives	0
Economic Hedging [Member] | Options Held [Member] | Long (Purchases) [Member] | Maturity Year Two [Member] | Natural Gas (In millions of btus) [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives	1,250,000
Economic Hedging [Member] | Options Held [Member] | Long (Purchases) [Member] | Maturity Year Three [Member] | Natural Gas (In millions of btus) [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives	0
Economic Hedging [Member] | Forward Contracts [Member] | Long (Purchases) [Member] | Maturity Year Two [Member] | Grain (In bushels) [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives	25,327,000
Economic Hedging [Member] | Forward Contracts [Member] | Long (Purchases) [Member] | Maturity Year Three [Member] | Grain (In bushels) [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives	1,081,000
Trading Derivatives [Member] | Swap [Member] | Long (Purchases) [Member] | Maturity Year Two [Member] | Crude Oil (In thousands of barrels) [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives	645
Trading Derivatives [Member] | Swap [Member] | Long (Purchases) [Member] | Maturity Year Three [Member] | Crude Oil (In thousands of barrels) [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives	0
Trading Derivatives [Member] | Swap [Member] | Short (Sales) [Member] | Maturity Year Two [Member] | Crude Oil (In thousands of barrels) [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives	645
Trading Derivatives [Member] | Swap [Member] | Short (Sales) [Member] | Maturity Year Three [Member] | Crude Oil (In thousands of barrels) [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives	0
Trading Derivatives [Member] | Future [Member] | Long (Purchases) [Member] | Maturity Year Two [Member] | Crude Oil (In thousands of barrels) [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives	95,709
Trading Derivatives [Member] | Future [Member] | Long (Purchases) [Member] | Maturity Year Two [Member] | Natural Gas (In millions of btus) [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives	6,200,000
Trading Derivatives [Member] | Future [Member] | Long (Purchases) [Member] | Maturity Year Three [Member] | Crude Oil (In thousands of barrels) [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives	5,116
Trading Derivatives [Member] | Future [Member] | Long (Purchases) [Member] | Maturity Year Three [Member] | Natural Gas (In millions of btus) [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives	0
Trading Derivatives [Member] | Future [Member] | Short (Sales) [Member] | Maturity Year Two [Member] | Crude Oil (In thousands of barrels) [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives	96,897
Trading Derivatives [Member] | Future [Member] | Short (Sales) [Member] | Maturity Year Two [Member] | Natural Gas (In millions of btus) [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives	4,200,000
Trading Derivatives [Member] | Future [Member] | Short (Sales) [Member] | Maturity Year Three [Member] | Crude Oil (In thousands of barrels) [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives	4,341
Trading Derivatives [Member] | Future [Member] | Short (Sales) [Member] | Maturity Year Three [Member] | Natural Gas (In millions of btus) [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives	0
Trading Derivatives [Member] | Options Held [Member] | Long (Purchases) [Member] | Maturity Year Two [Member] | Crude Oil (In thousands of barrels) [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives	1,900
Trading Derivatives [Member] | Options Held [Member] | Long (Purchases) [Member] | Maturity Year Three [Member] | Crude Oil (In thousands of barrels) [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives	0
Trading Derivatives [Member] | Options Held [Member] | Short (Sales) [Member] | Maturity Year Two [Member] | Crude Oil (In thousands of barrels) [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives	1,200
Trading Derivatives [Member] | Options Held [Member] | Short (Sales) [Member] | Maturity Year Three [Member] | Crude Oil (In thousands of barrels) [Member]
Volume of Outstanding Contracts
Nonmonetary notional amount of price risk derivatives	0

Price_Risk_Management_Activiti3

Price Risk Management Activities, Hedging Instruments by Consolidated Balance Sheet Location (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Fair Values of Derivative Instruments
Total derivatives assets, net		$537
Total derivative liabilities, net		529
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		25
Derivative asset, fair value, gross liability		36
Not Designated as Hedging Instrument [Member]
Fair Values of Derivative Instruments
Derivative asset, fair value, gross asset	3,133	512
Derivative liability, fair value, gross liability	2,925	493
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	3,096	474
Derivative asset, fair value, gross liability	2,886	455
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	34	33
Derivative asset, fair value, gross liability	31	18
Not Designated as Hedging Instrument [Member] | Swap [Member] | Commodity Contract [Member] | Prepaid Expenses And Other [Member]
Fair Values of Derivative Instruments
Derivative asset, fair value, gross asset		3
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		0
Derivative liability, fair value, gross liability		5
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	2
Derivative asset, fair value, gross liability	3	2
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	1	0
Derivative asset, fair value, gross liability	5	5
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
Derivative liability, fair value, gross liability		$8

Price_Risk_Management_Activiti4

Price Risk Management Activities, Gain (Loss) by Income Statement Location (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Effect of Derivative Instruments on Income and OCI (Textual)
Gain from hedged firm commitment not qualifying as fair value hedge, net			$28,000,000
Accumulated other comprehensive income, cumulative after-tax gains or losses on cash flow hedges	0
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	-42,000,000	-12,000,000	-250,000,000
Gain recognized in income on hedged item	42,000,000	18,000,000	183,000,000
Gain (loss) recognized in income on derivatives (ineffective portion)	0	6,000,000	-67,000,000
Cash Flow Hedging [Member] | Commodity Contract [Member]
Effect of Derivative Instruments on Income and OCI
Gain (loss) recognized in OCI on derivatives (effective portion)	-1,000,000	-4,000,000	45,000,000
Cash Flow Hedging [Member] | Commodity Contract [Member] | Cost of Sales [Member]
Effect of Derivative Instruments on Income and OCI
Gain (loss) reclassified from accumulated OCI into income (effective portion)	-2,000,000	-2,000,000	73,000,000
Gain (loss) recognized in income on derivatives (ineffective portion)	-1,000,000	21,000,000	48,000,000
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	693,000,000	193,000,000	1,000,000
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	40,000,000	14,000,000	-38,000,000
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	38,000,000	21,000,000	-16,000,000
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	($20,000,000)	$0

Quarterly_Financial_Data_Unaud2

Quarterly Financial Data (Unaudited) (Details) (USD $)	3 Months Ended									12 Months Ended
In Millions, except Per Share data, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013		Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Results of operations
Operating revenues	$27,859	$34,408	$34,914	$33,663	$34,429	$36,137	$34,034	[1]	$33,474	$130,844	$138,074	$138,393
Operating income	1,796	1,670	1,085	1,351	1,562	532	805	[1]	1,058	5,902	3,957	5,044
Net income	1,220	1,062	593	836	1,287	324	465	[1]	652	3,711	2,728	2,080
Net income attributable to Valero Energy Corporation stockholders	$1,155	$1,059	$588	$828	$1,288	$312	$466	[1]	$654	$3,630	$2,720	$2,083
Earnings per common share (in usd per share)	$2.22	$2.01	$1.11	$1.55	$2.39	$0.58	$0.86	[1]	$1.18	$6.88	$4.99	$3.77
Earnings per common share - assuming dilution (in usd per share)	$2.22	$2	$1.10	$1.54	$2.38	$0.57	$0.85	[1]	$1.18	$6.85	$4.97	$3.75
[1]	The separation of our retail business was completed on May 1, 2013.