Fair Value Measurements Fair Value of Assets and Liabilities on Recurring And Nonrecurring Basis (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended					9 Months Ended
	Sep. 30, 2012	Jun. 30, 2012	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Assets and liabilities measured on recurring and nonrecurring basis [Line Items]
Debt Instrument, Fair Value Disclosure	$ 4,861					$ 4,861		$ 4,649
Goodwill impairment charge	748	3,602			697	4,350	697
Intangible asset impairment charges	13	129	9	12		142	21
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Time Deposits, at Carrying Value	147					147		88
Accrued Contingent Consideration	604					604		358
Cash	141					141		101
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Abstract]
Cost-method Investments, Aggregate Carrying Amount	13					13		16
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Money Market Funds, at Carrying Value
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Money Market Funds, at Carrying Value	64					64		78
Foreign Currency Contract, Asset, Fair Value Disclosure	51					51		87
Assets, Fair Value Disclosure	115					115		165
Currency Hedge Contracts Liabilities	101					101		131
Accrued Contingent Consideration	604					604		358
Liabilities, Fair Value Disclosure	705					705		489
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Money Market Funds, at Carrying Value	64					64		78
Foreign Currency Contract, Asset, Fair Value Disclosure
Assets, Fair Value Disclosure	64					64		78
Currency Hedge Contracts Liabilities
Accrued Contingent Consideration
Liabilities, Fair Value Disclosure
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Money Market Funds, at Carrying Value
Foreign Currency Contract, Asset, Fair Value Disclosure	51					51		87
Assets, Fair Value Disclosure	51					51		87
Currency Hedge Contracts Liabilities	101					101		131
Accrued Contingent Consideration
Liabilities, Fair Value Disclosure	101					101		131
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Money Market Funds, at Carrying Value
Foreign Currency Contract, Asset, Fair Value Disclosure
Assets, Fair Value Disclosure
Currency Hedge Contracts Liabilities
Accrued Contingent Consideration	604					604		358
Liabilities, Fair Value Disclosure	$ 604					$ 604		$ 358