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Income Taxes (Details) (USD $)
 12 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Foreign Tax Authority [Member]
Dec. 31, 2012
State and Local Jurisdiction [Member]
Dec. 31, 2012
State and Local Jurisdiction [Member]
U S State Income Tax Credits Limited [Member]
Dec. 31, 2012
State and Local Jurisdiction [Member]
U S State Income Tax Credits Unlimited [Member]
Dec. 31, 2012
Consolidated Statement Of Income [Member]
Dec. 31, 2012
Additional Paid-in Capital [Member]
Dec. 31, 2012
Minimum [Member]
State and Local Jurisdiction [Member]
Dec. 31, 2012
Minimum [Member]
State and Local Jurisdiction [Member]
U S State Income Tax Credits Limited [Member]
Dec. 31, 2012
Maximum [Member]
State and Local Jurisdiction [Member]
Dec. 31, 2012
Maximum [Member]
State and Local Jurisdiction [Member]
U S State Income Tax Credits Limited [Member]
Sep. 30, 2012
Aruba Refinery [Member]
Mar. 31, 2012
Aruba Refinery [Member]
Dec. 31, 2012
Aruba Refinery [Member]
Income (Loss) from Continuing Operations Before Income Tax Expense (Benefit) from Domestic and Foreign Operations                                
U.S. operations $ 4,015,000,000 $ 3,190,000,000 $ 1,436,000,000                          
International operations (309,000,000) 132,000,000 62,000,000                          
Income from continuing operations before income tax expense 3,706,000,000 3,322,000,000 1,498,000,000                          
Reconciliation of Income Tax Expense (Benefit) Related to Income (Loss) from Continuing Operations Before Income Tax Expense (Benefit)                                
Federal income tax expense at the U.S. statutory rate 1,297,000,000 1,163,000,000 524,000,000                          
U.S. state income tax expense (benefit), net of U.S. federal income tax effect 64,000,000 29,000,000 (21,000,000)                          
U.S. manufacturing deduction (33,000,000) (28,000,000) 5,000,000                          
International operations 266,000,000 46,000,000 27,000,000                          
Permanent differences 20,000,000 8,000,000 8,000,000                          
Change in tax law 0 0 16,000,000                          
Other, net 12,000,000 8,000,000 16,000,000                          
Income tax expense 1,626,000,000 1,226,000,000 575,000,000                          
Current:                                
U.S. federal 515,000,000 562,000,000 (75,000,000)                          
U.S. state 22,000,000 13,000,000 (13,000,000)                          
International 126,000,000 186,000,000 22,000,000                          
Total current 663,000,000 761,000,000 (66,000,000)                          
Deferred:                                
U.S. federal 854,000,000 527,000,000 634,000,000                          
U.S. state 77,000,000 32,000,000 (19,000,000)                          
International 32,000,000 (94,000,000) 26,000,000                          
Total deferred 963,000,000 465,000,000 641,000,000                          
Income tax expense 1,626,000,000 1,226,000,000 575,000,000                          
Income Tax Credit and Loss Carryforwards                                
Income tax credits           79,000,000 12,000,000                  
Income tax credits, expiration                     Dec. 31, 2013   Dec. 31, 2027      
NOL       518,000,000 4,806,000,000                      
NOL, expiration                   2013   2032        
Deferred income tax assets:                                
Tax credit carryforwards 61,000,000 158,000,000                            
Net operating losses (NOL) 247,000,000 300,000,000                            
Compensation and employee benefit liabilities 383,000,000 324,000,000                            
Environmental liabilities 83,000,000 78,000,000                            
Inventories 258,000,000 273,000,000                            
Property, plant and equipment 78,000,000 14,000,000                            
Other 157,000,000 160,000,000                            
Total deferred income tax assets 1,267,000,000 1,307,000,000                            
Less: valuation allowance (304,000,000) (295,000,000)           (297,000,000) (7,000,000)              
Net deferred income tax assets 963,000,000 1,012,000,000                            
Deferred income tax liabilities:                                
Turnarounds (300,000,000) (310,000,000)                            
Property, plant and equipment (6,143,000,000) (5,292,000,000)                            
Inventories (381,000,000) (274,000,000)                            
Other (103,000,000) (119,000,000)                            
Total deferred income tax liabilities (6,927,000,000) (5,995,000,000)                            
Net deferred income tax liabilities (5,964,000,000) (4,983,000,000)                            
Valuation Allowance Allocation                                
Deferred tax assets valuation allowance 304,000,000 295,000,000           297,000,000 7,000,000              
Reconciliation of the Change in Unrecognized Tax Benefits RollForward                                
Balance as of beginning of year 326,000,000 330,000,000 484,000,000                          
Additions based on tax positions related to the current year 11,000,000 14,000,000 4,000,000                          
Additions for tax positions related to prior years 40,000,000 55,000,000 49,000,000                          
Reductions for tax positions related to prior years (36,000,000) (66,000,000) (203,000,000)                          
Reductions for tax positions related to the lapse of applicable statute of limitations 0 (3,000,000) (4,000,000)                          
Settlements 0 (4,000,000) 0                          
Balance as of end of year 341,000,000 326,000,000 330,000,000                          
Income Taxes (Textual)                                
Statutory federal income tax rate 35.00%                              
Asset impairment loss                           333,000,000 595,000,000 928,000,000
Income tax benefit related to discontinued operations   4,000,000 370,000,000                          
Cumulative undistributed earnings of foreign subsidiaries 3,500,000,000                              
Income tax benefits if recognized that would impact the effective tax rate 144,000,000 135,000,000 153,000,000                          
Interest expense and penalties recognized 23,000,000 1,000,000 19,000,000                          
Interest expense and penalties accrued $ 133,000,000 $ 110,000,000