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Income Taxes (Details) (USD $) | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 Tax Years 2005 to 2012 [Member] | Dec. 31, 2012 Tax Years 2005 to 2012 [Member] | Dec. 31, 2013 Consolidated Statement Of Income [Member] | Dec. 31, 2013 Additional Paid-in Capital [Member] | Dec. 31, 2013 State and Local Jurisdiction [Member] | Dec. 31, 2013 State and Local Jurisdiction [Member] Minimum [Member] | Dec. 31, 2013 State and Local Jurisdiction [Member] Maximum [Member] | Dec. 31, 2013 State and Local Jurisdiction [Member] U S State Income Tax Credits Limited [Member] | Dec. 31, 2013 State and Local Jurisdiction [Member] U S State Income Tax Credits Limited [Member] Minimum [Member] | Dec. 31, 2013 State and Local Jurisdiction [Member] U S State Income Tax Credits Limited [Member] Maximum [Member] | Dec. 31, 2013 Foreign Tax Authority [Member] | Sep. 30, 2012 Aruba Refinery [Member] | Mar. 31, 2012 Aruba Refinery [Member] | Dec. 31, 2012 Aruba Refinery [Member]
Income from Continuing Operations Before Income Tax Expense from Domestic and Foreign Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. operations | $ 3,531,000,000 | $ 4,015,000,000 | $ 3,190,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
International operations | 451,000,000 | (309,000,000) | 132,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations before income tax expense | 3,982,000,000 | 3,706,000,000 | 3,322,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 | 1,394,000,000 | 1,297,000,000 | 1,163,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. state income tax expense, net of U.S. federal income tax effect | 62,000,000 | 64,000,000 | 29,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. manufacturing deduction | (36,000,000) | (33,000,000) | (28,000,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |
International operations | (71,000,000) | 266,000,000 | 46,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Permanent differences | (104,000,000) | 20,000,000 | 8,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change in tax law | (32,000,000) | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other, net | 41,000,000 | 12,000,000 | 8,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income tax expense | 1,254,000,000 | 1,626,000,000 | 1,226,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. federal | 635,000,000 | 515,000,000 | 562,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. state | 36,000,000 | 22,000,000 | 13,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
International | 82,000,000 | 126,000,000 | 186,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total current | 753,000,000 | 663,000,000 | 761,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. federal | 459,000,000 | 854,000,000 | 527,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. state | 59,000,000 | 77,000,000 | 32,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
International | (17,000,000) | 32,000,000 | (94,000,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total deferred | 501,000,000 | 963,000,000 | 465,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income tax expense | 1,254,000,000 | 1,626,000,000 | 1,226,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred income tax assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax credit carryforwards | 48,000,000 | 61,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net operating losses (NOLs) | 338,000,000 | 247,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Inventories | 264,000,000 | 258,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant, and equipment | 8,000,000 | 78,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation and employee benefit liabilities | 178,000,000 | 383,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Environmental liabilities | 92,000,000 | 83,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other | 187,000,000 | 157,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total deferred income tax assets | 1,115,000,000 | 1,267,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Less: Valuation allowance | (347,000,000) | (304,000,000) |  |  |  | (340,000,000) | (7,000,000) |  |  |  |  |  |  |  |  |  |
Net deferred income tax assets | 768,000,000 | 963,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred income tax liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant, and equipment | 6,536,000,000 | 6,143,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred turnaround costs | 331,000,000 | 300,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Inventories | 310,000,000 | 381,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments, primarily in VLP and DGD | 94,000,000 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other | 81,000,000 | 103,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total deferred income tax liabilities | 7,352,000,000 | 6,927,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net deferred income tax liabilities | 6,584,000,000 | 5,964,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Credit and Loss Carryforwards |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. state income tax credits |  |  |  |  |  |  |  |  |  |  | 71,000,000 |  |  |  |  |  |
NOL |  |  |  |  |  |  |  | 5,609,000,000 |  |  |  |  |  | 1,289,000,000 |  |  |
Income tax credits, expiration |  |  |  |  |  |  |  |  |  |  |  | Dec. 31, 2014 | Dec. 31, 2027 |  |  |  |
NOL, expiration |  |  |  |  |  |  |  |  | Dec. 31, 2014 | Dec. 31, 2033 |  |  |  |  |  |  |
Valuation Allowance Allocation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred tax assets valuation allowance | 347,000,000 | 304,000,000 |  |  |  | 340,000,000 | 7,000,000 |  |  |  |  |  |  |  |  |  |
Reconciliation of the Change in Unrecognized Tax Benefits RollForward |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance as of beginning of year | 341,000,000 | 326,000,000 | 330,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additions based on tax positions related to the current year | 64,000,000 | 11,000,000 | 14,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additions for tax positions related to prior years | 576,000,000 | 40,000,000 | 55,000,000 | 556,000,000 | 0 |  |  |  |  |  |  |  |  |  |  |  |
Reductions for tax positions related to prior years | (26,000,000) | (36,000,000) | (66,000,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reductions for tax positions related to the lapse of applicable statute of limitations | (4,000,000) | 0 | (3,000,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settlements | (1,000,000) | 0 | (4,000,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance as of end of year | 950,000,000 | 341,000,000 | 326,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reconciliation of Unrecognized Tax Benefits to Uncertain Tax Position Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized tax benefits | 950,000,000 | 341,000,000 | 326,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax refund claim not recognized in our financial statements | (576,000,000) | (40,000,000) | (55,000,000) | (556,000,000) | 0 |  |  |  |  |  |  |  |  |  |  |  |
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 | 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Uncertain tax position liabilities | 443,000,000 | 391,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes (Textual) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Statutory federal income tax rate | 35.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on disposition of retained interest in CST Brands, Inc. | 325,000,000 | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset impairment losses | 0 | 1,014,000,000 | 0 |  |  |  |  |  |  |  |  |  |  |  | 333,000,000 | 595,000,000 | 928,000,000
Income tax benefit related to discontinued operations | 0 | 0 | 4,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in valuation allowance | 43,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative undistributed earnings of foreign subsidiaries | 3,500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additions for tax positions related to prior years | 576,000,000 | 40,000,000 | 55,000,000 | 556,000,000 | 0 |  |  |  |  |  |  |  |  |  |  |  |
Income tax benefits if recognized that would impact the effective tax rate | 763,000,000 | 144,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Possible reduction to unrecognized tax benefit, lower range | 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Possible reduction to unrecognized tax benefit, upper range | 180,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense and penalties recognized | 12,000,000 | 23,000,000 | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense and penalties accrued | $ 145,000,000 | $ 133,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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