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Income Taxes (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2015 | Dec. 31, 2014
Income from Continuing Operations Before Income Tax Expense from Domestic and Foreign Operations |  |  |  |  |
U.S. operations | $ 5,327 | $ 4,677 | $ 3,531 |  |
International operations | 644 | 875 | 445 |  |
Income from continuing operations before income tax expense | 5,971 | 5,552 | 3,976 |  |
Reconciliation of Income Tax Expense Related to Income from Continuing Operations Before Income Tax Expense |  |  |  |  |
Income tax expense at statutory rates | 1,956 | 1,782 | 1,320 |  |
U.S. state and Canadian provincial tax expense, net of federal income tax effect | 118 | 133 | 86 |  |
Permanent differences: |  |  |  |  |
Manufacturing deduction | (102) | (74) | (36) |  |
Nontaxable gain on disposition (See Notes 3 and 10) |  |  | (114) |  |
Other | (23) | (15) | 9 |  |
Change in tax law | (17) |  | (32) |  |
Tax effects of income associated with noncontrolling interests | (39) | (28) | (3) |  |
Other, net | (23) | (21) | 24 |  |
Income tax expense | 1,870 | 1,777 | 1,254 |  |
Current: |  |  |  |  |
Country | 1,577 | 1,249 | 688 |  |
U.S. state / Canadian provincial | 128 | 83 | 65 |  |
Total current | 1,705 | 1,332 | 753 |  |
Deferred: |  |  |  |  |
Country | 151 | 362 | 447 |  |
U.S. state / Canadian provincial | 14 | 83 | 54 |  |
Total deferred | 165 | 445 | 501 |  |
Income tax expense | 1,870 | 1,777 | 1,254 |  |
Deferred income tax assets: |  |  |  |  |
Tax credit carryforwards |  |  |  | $ 33 | $ 37
Net operating losses (NOLs) |  |  |  | 423 | 436
Inventories |  |  |  | 72 | 160
Compensation and employee benefit liabilities |  |  |  | 331 | 358
Environmental liabilities |  |  |  | 80 | 92
Other |  |  |  | 139 | 178
Total deferred income tax assets |  |  |  | 1,078 | 1,261
Less: Valuation allowance |  |  |  | (435) | (393)
Net deferred income tax assets |  |  |  | 643 | 868
Deferred income tax liabilities: |  |  |  |  |
Property, plant, and equipment |  |  |  | 6,725 | 6,682
Deferred turnaround costs |  |  |  | 394 | 356
Inventories |  |  |  | 287 | 426
Investments |  |  |  | 226 | 152
Other |  |  |  | 71 | 73
Total deferred income tax liabilities |  |  |  | 7,703 | 7,689
Net deferred income tax liabilities |  |  |  | 7,060 | 6,821
Valuation Allowance Allocation |  |  |  |  |
Deferred tax assets valuation allowance |  |  |  | 435 | 393
Reconciliation of the Change in Unrecognized Tax Benefits RollForward |  |  |  |  |
Balance as of beginning of year | 989 | 950 | 341 |  |
Additions based on tax positions related to the current year | 36 | 35 | 64 |  |
Additions for tax positions related to prior years | 83 | 118 | 576 |  |
Reductions for tax positions related to prior years | (82) | (67) | (26) |  |
Reductions for tax positions related to the lapse of applicable statute of limitations | (3) | (1) | (4) |  |
Settlements | (59) | (46) | (1) |  |
Balance as of end of year | 964 | 989 | 950 |  |
Reconciliation of Unrecognized Tax Benefits to Uncertain Tax Position Liabilities |  |  |  |  |
Unrecognized tax benefits | 989 | 950 | 341 | 964 | 989
Tax refund claim not recognized in our financial statements |  |  |  | (570) | (554)
Reduction of deferred tax asset |  |  |  | (28) | 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 |  |  |  | 25 | 49
Uncertain tax position liabilities |  |  |  | 391 | 484
Income Taxes (Textual) |  |  |  |  |
Income tax benefit related to discontinued operations | 0 | 0 | 0 |  |
Increase in valuation allowance | 42 |  |  |  |
Cumulative undistributed earnings of foreign subsidiaries |  |  |  | 3,200 |
Tax refund claim not recognized in our financial statements |  |  |  | 570 | 554
Income tax benefits if recognized that would impact the effective tax rate |  |  |  | 757 | 768
Interest expense and penalties recognized | $ 5 | $ 2 | $ 12 |  |
Interest expense and penalties accrued |  |  |  | 117 | $ 141
Possible reduction to unrecognized tax benefit |  |  |  | 370 |
Consolidated Statement Of Income [Member] |  |  |  |  |
Deferred income tax assets: |  |  |  |  |
Less: Valuation allowance |  |  |  | (429) |
Valuation Allowance Allocation |  |  |  |  |
Deferred tax assets valuation allowance |  |  |  | 429 |
Additional Paid-in Capital [Member] |  |  |  |  |
Deferred income tax assets: |  |  |  |  |
Less: Valuation allowance |  |  |  | (6) |
Valuation Allowance Allocation |  |  |  |  |
Deferred tax assets valuation allowance |  |  |  | 6 |
U.S. [Member] |  |  |  |  |
Statutory Income Tax Rates Applicable to Income from Continuing Operations Before Income Tax Expense |  |  |  |  |
Applicable statutory income tax rate | 35.00% | 35.00% | 35.00% |  |
Canada [Member] |  |  |  |  |
Statutory Income Tax Rates Applicable to Income from Continuing Operations Before Income Tax Expense |  |  |  |  |
Applicable statutory income tax rate | 15.00% | 15.00% | 15.00% |  |
U.K. [Member] |  |  |  |  |
Statutory Income Tax Rates Applicable to Income from Continuing Operations Before Income Tax Expense |  |  |  |  |
Applicable statutory income tax rate | 20.00% | 21.00% | 23.00% |  |
Ireland [Member] |  |  |  |  |
Statutory Income Tax Rates Applicable to Income from Continuing Operations Before Income Tax Expense |  |  |  |  |
Applicable statutory income tax rate | 13.00% | 13.00% | 13.00% |  |
Aruba [Member] |  |  |  |  |
Statutory Income Tax Rates Applicable to Income from Continuing Operations Before Income Tax Expense |  |  |  |  |
Applicable statutory income tax rate | 7.00% | 7.00% | 7.00% |  |
Domestic Tax Authority [Member] |  |  |  |  |
Reconciliation of Income Tax Expense Related to Income from Continuing Operations Before Income Tax Expense |  |  |  |  |
Income tax expense at statutory rates | $ 1,864 | $ 1,637 | $ 1,236 |  |
U.S. state and Canadian provincial tax expense, net of federal income tax effect | 45 | 62 | 62 |  |
Permanent differences: |  |  |  |  |
Manufacturing deduction | (102) | (74) | (36) |  |
Nontaxable gain on disposition (See Notes 3 and 10) |  |  | (114) |  |
Other | (18) | (16) | 10 |  |
Change in tax law | 0 |  | (10) |  |
Tax effects of income associated with noncontrolling interests | (39) | (28) | (3) |  |
Other, net | (25) | (22) | 44 |  |
Income tax expense | 1,725 | 1,559 | 1,189 |  |
Current: |  |  |  |  |
Country | 1,513 | 1,196 | 635 |  |
U.S. state / Canadian provincial | 85 | 59 | 36 |  |
Total current | 1,598 | 1,255 | 671 |  |
Deferred: |  |  |  |  |
Country | 143 | 268 | 459 |  |
U.S. state / Canadian provincial | (16) | 36 | 59 |  |
Total deferred | 127 | 304 | 518 |  |
Income tax expense | 1,725 | 1,559 | 1,189 |  |
Foreign Tax Authority [Member] |  |  |  |  |
Reconciliation of Income Tax Expense Related to Income from Continuing Operations Before Income Tax Expense |  |  |  |  |
Income tax expense at statutory rates | 92 | 145 | 84 |  |
U.S. state and Canadian provincial tax expense, net of federal income tax effect | 73 | 71 | 24 |  |
Permanent differences: |  |  |  |  |
Manufacturing deduction | 0 | 0 | 0 |  |
Nontaxable gain on disposition (See Notes 3 and 10) |  |  | 0 |  |
Other | (5) | 1 | (1) |  |
Change in tax law | (17) |  | (22) |  |
Tax effects of income associated with noncontrolling interests | 0 | 0 | 0 |  |
Other, net | 2 | 1 | (20) |  |
Income tax expense | 145 | 218 | 65 |  |
Current: |  |  |  |  |
Country | 64 | 53 | 53 |  |
U.S. state / Canadian provincial | 43 | 24 | 29 |  |
Total current | 107 | 77 | 82 |  |
Deferred: |  |  |  |  |
Country | 8 | 94 | (12) |  |
U.S. state / Canadian provincial | 30 | 47 | (5) |  |
Total deferred | 38 | 141 | (17) |  |
Income tax expense | $ 145 | $ 218 | $ 65 |  |
Income Tax Credit and Loss Carryforwards |  |  |  |  |
NOL |  |  |  | 1,465 |
State and Local Jurisdiction [Member] |  |  |  |  |
Income Tax Credit and Loss Carryforwards |  |  |  |  |
NOL |  |  |  | 7,302 |
State and Local Jurisdiction [Member] | Minimum [Member] |  |  |  |  |
Income Tax Credit and Loss Carryforwards |  |  |  |  |
NOL, expiration | Dec. 31, 2016 |  |  |  |
State and Local Jurisdiction [Member] | Maximum [Member] |  |  |  |  |
Income Tax Credit and Loss Carryforwards |  |  |  |  |
NOL, expiration | Dec. 31, 2035 |  |  |  |
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 |  |  |  | $ 51 |
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 | Dec. 31, 2016 |  |  |  |
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 | Dec. 31, 2027 |  |  |  |

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