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Shareholders' Equity (Details 5) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Accumulated balances related to each component of Other comprehensive income (loss)      
Beginning Balance, Foreign currency translation adjustment $ 969 $ 1,224 $ 1,164
Beginning Balance, Unrealized gain (loss) on available-for-sale financial assets, net of tax 22 (6) (16)
Beginning Balance, Unrealized gain (loss) on derivatives, net of tax 61 6 11
Beginning Balance, Impact on change on accounting standards, net of tax (73) (60) (65)
Beginning Balance, Accumulated other comprehensive income (loss) 979 1,164 1,094
Other comprehensive income (loss), Foreign currency translation adjustment (101) (255) 61
Other comprehensive income (loss), Unrealized gain (loss) on available-for-sale financial assets, net of tax (32) 28 10
Other comprehensive income (loss), Unrealized gain (loss) on derivatives, net of tax (116) 55 (5)
Other comprehensive income (loss), Impact on change on accounting standards, net of tax (60) (13) 4
Ending Balance, Foreign currency translation adjustment 868 969 1,224
Ending Balance, Unrealized gain (loss) on available-for-sale financial assets, net of tax (10) 22 (6)
Ending Balance, Unrealized gain (loss) on derivatives, net of tax (55) 61 6
Ending Balance, Impact on change on accounting standards, net of tax (133) (73) (60)
Ending Balance, Accumulated other comprehensive income (loss) $ 670 $ 979 $ 1,164