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, 2013	Mar. 31, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Assets and liabilities measured on recurring and nonrecurring basis [Line Items]
Debt Instrument, Fair Value Disclosure	$ 4,684			$ 4,684		$ 4,793
Goodwill impairment charges	0	423	3,602	423	3,602
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Time Deposits, at Carrying Value	272			272
Accrued Contingent Consideration	610			610		663
Cash	156			156		168
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Abstract]
Cost-method Investments, Aggregate Carrying Amount	21			21		13
Asset Impairment Charges				476
Intangible asset impairment charges	53		129	53	129
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Money Market Funds, at Carrying Value	0			0
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Money Market Funds, at Carrying Value	102			102		39
Foreign Currency Contract, Asset, Fair Value Disclosure	267			267		121
Assets, Fair Value Disclosure	369			369		160
Currency Hedge Contracts Liabilities	24			24		57
Accrued Contingent Consideration	610			610		663
Liabilities, Fair Value Disclosure	634			634		720
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	102			102		39
Foreign Currency Contract, Asset, Fair Value Disclosure	0			0		0
Assets, Fair Value Disclosure	102			102		39
Currency Hedge Contracts Liabilities	0			0		0
Accrued Contingent Consideration	0			0		0
Liabilities, Fair Value Disclosure	0			0		0
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						0
Foreign Currency Contract, Asset, Fair Value Disclosure	267			267		121
Assets, Fair Value Disclosure	267			267		121
Currency Hedge Contracts Liabilities	24			24		57
Accrued Contingent Consideration	0			0		0
Liabilities, Fair Value Disclosure	24			24		57
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	0			0		0
Foreign Currency Contract, Asset, Fair Value Disclosure	0			0		0
Assets, Fair Value Disclosure	0			0		0
Currency Hedge Contracts Liabilities	0			0		0
Accrued Contingent Consideration	610			610		663
Liabilities, Fair Value Disclosure	$ 610			$ 610		$ 663