Income Taxes (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income (Loss) from Continuing Operations Before Income Tax Expense (Benefit) from Domestic and Foreign Operations
U.S. operations	$ 3,190,000,000	$ 1,436,000,000	$ (371,000,000)
Income (loss) from continuing operations before income tax expense (benefit)	3,322,000,000	1,498,000,000	(316,000,000)
Reconciliation of Income Tax Expense (Benefit) Related to Income (Loss) from Continuing Operations Before Income Tax Expense (Benefit)
Federal income tax expense (benefit) at the U.S. statutory rate	1,163,000,000	524,000,000	(111,000,000)
U.S. state income tax expense (benefit), net of U.S. federal income tax effect	29,000,000	(21,000,000)	(2,000,000)
U.S. manufacturing deduction	(28,000,000)	5,000,000	7,000,000
Permanent differences	8,000,000	8,000,000	(7,000,000)
Change in tax law	0	16,000,000	0
Other, net	8,000,000	16,000,000	(5,000,000)
Income tax expense (benefit)	1,226,000,000	575,000,000	(43,000,000)
Current:
U.S. federal	562,000,000	(75,000,000)	(309,000,000)
U.S. state	13,000,000	(13,000,000)	(16,000,000)
Total current	761,000,000	(66,000,000)	(183,000,000)
Deferred:
U.S. federal	527,000,000	634,000,000	181,000,000
U.S. state	32,000,000	(19,000,000)	12,000,000
Total deferred	465,000,000	641,000,000	140,000,000
Income tax expense (benefit)	1,226,000,000	575,000,000	(43,000,000)
Valuation Allowance Allocation
Deferred tax assets valuation allowance	295,000,000	270,000,000
Deferred income tax assets:
Tax credit carryforwards	158,000,000	99,000,000
Net operating losses (NOL)	300,000,000	265,000,000
Compensation and employee benefit liabilities	324,000,000	286,000,000
Environmental liabilities	78,000,000	85,000,000
Inventories	273,000,000	170,000,000
Property, plant and equipment	14,000,000	0
Other	160,000,000	184,000,000
Total deferred income tax assets	1,307,000,000	1,089,000,000
Less: valuation allowance	(295,000,000)	(270,000,000)
Net deferred income tax assets	1,012,000,000	819,000,000
Deferred income tax liabilities:
Turnarounds	(310,000,000)	(256,000,000)
Property, plant and equipment	(5,292,000,000)	(4,835,000,000)
Inventories	(274,000,000)	(260,000,000)
Other	(119,000,000)	(65,000,000)
Total deferred income tax liabilities	(5,995,000,000)	(5,416,000,000)
Net deferred income tax liabilities	(4,983,000,000)	(4,597,000,000)
Reconciliation of the Change in Unrecognized Tax Benefits
Balance as of beginning of year	330,000,000	484,000,000	238,000,000
Additions based on tax positions related to the current year	14,000,000	4,000,000	158,000,000
Additions for tax positions related to prior years	55,000,000	49,000,000	106,000,000
Reductions for tax positions related to prior years	(66,000,000)	(203,000,000)	(6,000,000)
Reductions for tax positions related to the lapse of applicable statute of limitations	(3,000,000)	(4,000,000)	(1,000,000)
Settlements	(4,000,000)	0	(11,000,000)
Balance as of end of year	326,000,000	330,000,000	484,000,000
Income Taxes (Textual)
Statutory federal income tax rate	35.00%
Income tax benefit related to discontinued operations	(4,000,000)	(370,000,000)	(1,100,000,000)
Cumulative undistributed earnings of foreign subsidiaries	4,900,000,000
Income tax benefits if recognized that would impact the effective tax rate	135,000,000	153,000,000	155,000,000
Interest expense and penalties recognized	1,000,000	19,000,000	22,000,000
Interest expense and penalties accrued	110,000,000	109,000,000
Domestic Country [Member]
Income Tax Credit and Loss Carryforwards
Income tax credits, expiration	Unlimited
Alternative minimum tax credit	59,000,000
Foreign Country [Member]
Income (Loss) from Continuing Operations Before Income Tax Expense (Benefit) from Domestic and Foreign Operations
International operations	132,000,000	62,000,000	55,000,000
Reconciliation of Income Tax Expense (Benefit) Related to Income (Loss) from Continuing Operations Before Income Tax Expense (Benefit)
International operations	46,000,000	27,000,000	75,000,000
Current:
International	186,000,000	22,000,000	142,000,000
Deferred:
International	(94,000,000)	26,000,000	(53,000,000)
Income Tax Credit and Loss Carryforwards
Income tax credits	30,000,000
Income tax credits, expiration	2012
NOL	249,000,000
NOL, expiration	Unlimited
State and Local Jurisdiction [Member]
Income Tax Credit and Loss Carryforwards
NOL	5,431,000,000
NOL, expiration	2012 through 2031
State and Local Jurisdiction [Member] | U S State Income Tax Credits Limited [Member]
Income Tax Credit and Loss Carryforwards
Income tax credits	63,000,000
Income tax credits, expiration	2013 through 2027
State and Local Jurisdiction [Member] | U S State Income Tax Credits Unlimited [Member]
Income Tax Credit and Loss Carryforwards
Income tax credits	42,000,000
Income tax credits, expiration	Unlimited
Consolidated Statement Of Income [Member]
Valuation Allowance Allocation
Deferred tax assets valuation allowance	286,000,000
Deferred income tax assets:
Less: valuation allowance	(286,000,000)
Additional Paid-in Capital [Member]
Valuation Allowance Allocation
Deferred tax assets valuation allowance	9,000,000
Deferred income tax assets:
Less: valuation allowance	$ (9,000,000)