Fair Value Measurements Fair Value of Assets and Liabilities on Recurring And Nonrecurring Basis (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Mar. 31, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011	Dec. 31, 2010
Assets and liabilities measured on recurring and nonrecurring basis [Line Items]
Goodwill implied fair value			$ 782
Debt Instrument, Fair Value Disclosure	4,824			4,824		4,649
Goodwill impairment charge	3,602		697	3,602	697
Intangible asset impairment charges	129	12		129	12
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Time Deposits, at Carrying Value	151			151		88
Accrued Contingent Consideration	624			624		358
Cash	142			142		101
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Abstract]
Cost-method Investments, Aggregate Carrying Amount	13			13		16
Carrying value of goodwill prior to impairment							1,479
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	78			78		78
Foreign Currency Contract, Asset, Fair Value Disclosure	91			91		87
Assets, Fair Value Disclosure	169			169		165
Currency Hedge Contracts Liabilities	81			81		131
Accrued Contingent Consideration	624			624		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	78			78		78
Foreign Currency Contract, Asset, Fair Value Disclosure
Assets, Fair Value Disclosure	78			78		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	91			91		87
Assets, Fair Value Disclosure	91			91		87
Currency Hedge Contracts Liabilities	81			81		131
Accrued Contingent Consideration
Liabilities, Fair Value Disclosure	81			81		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	624			624		358
Liabilities, Fair Value Disclosure	$ 624			$ 624		$ 358