Income Taxes (Narrative) (Details) (USD $)	3 Months Ended		12 Months Ended
	Sep. 30, 2011	Mar. 31, 2010	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Taxes [Line Items]
Tax benefits from stock-based compensation recorded in additional paid-in-capital			$ 300,000,000
Tax benefit for excess foreign tax credits		265,000,000			265,000,000
Foreign earnings repatriated					1,100,000,000
Content of unremitted foreign earnings					70.00%
Multi year international capital investment plan to be spent next year			900,000,000
Additional capacity of investment	800,000,000
Period to recognize U.S. deferred tax assets associated with federal net operating loss carry forwards, in years			13 years
Accumulated foreign unremitted earnings			11,900,000,000	10,800,000,000	8,900,000,000
Unrecognized tax benefits that would impact our effective tax rate			11,000,000	15,000,000
U.S. profits required to realize deferred tax assets			7,100,000,000
Future U.S. profit required realizing deferred tax assets			3,800,000,000
Percentage of U.S. subsidiaries join in the filing of consolidated U.S. federal income tax returns			80.00%
Maximum [Member]
Income Taxes [Line Items]
Multi-year international capital investment plan				2,700,000,000
U.S. statues of limitations, period			5 years
Foreign statues of limitations period			7 years
Minimum [Member]
Income Taxes [Line Items]
Multi-year international capital investment plan				2,400,000,000
U.S. statues of limitations, period			3 years
Foreign statues of limitations period			3 years
United States And Foreign Deferred Tax Assets [Member]
Income Taxes [Line Items]
Deferred tax assets with remaining valuation allowances			$ 210,000,000	$ 219,000,000