Fair Value Measurements Fair Value of Assets and Liabilities on Recurring And Nonrecurring Basis (Details) (USD $) In Millions	3 Months Ended					9 Months Ended
	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Sep. 30, 2010	Mar. 31, 2010	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2010	Sep. 30, 2011 Reporting Unit One [Member]	Dec. 31, 2009 U.S. CRM Reporting Unit [Member]	Sep. 30, 2011 Fair Value, Measurements, Recurring [Member] Estimate of Fair Value, Fair Value Disclosure [Member]	Dec. 31, 2010 Fair Value, Measurements, Recurring [Member] Estimate of Fair Value, Fair Value Disclosure [Member]	Sep. 30, 2011 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2010 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member]	Sep. 30, 2011 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2010 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member]	Sep. 30, 2011 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 3 [Member]	Dec. 31, 2010 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 3 [Member]	Sep. 30, 2011 Fair Value, Inputs, Level 2 [Member]
Assets and liabilities measured on recurring and nonrecurring basis [Line Items]
Debt Instrument, Decrease, Repayments						$ 1,250
Asset Impairment Charges					1,882	718
Goodwill implied fair value					1,479
Debt Instrument, Fair Value Disclosure	4,667					4,667		5,654
Goodwill, Impairment Loss			697			697	1,817
Intangible asset impairment charges	9	12		5	60	21	65
Cost-method Investments, Realized Gain (Loss)			15				5
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Money Market Funds, at Carrying Value											145	105	145	105
Foreign Currency Contract, Asset, Fair Value Disclosure											83	82			83	82
Assets, Fair Value Disclosure											228	187	145	105	83	82
Time Deposits, at Carrying Value	12					12		16
Currency Hedge Contracts Liabilities	2,302					2,302		2,679			161	189			161	189
Accrued Contingent Consideration											376	71					376	71
Liabilities, Fair Value Disclosure											537	260			161	189	376	71
Cash	119					119		92
Recurring fair value measurements [Roll Forward]
Fair Value Of Recurring Fair Value Measurements Amount, starting balance			(71)			(71)
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability Contingent consideration liability recorded						(287)
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liability adjustment						(18)
Fair Value Of Recurring Fair Value Measurements Amount, ending balance	(376)					(376)
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Abstract]
Cost-method Investments, Aggregate Carrying Amount	16					16		43
Carrying value of goodwill prior to impairment								1,479		3,296
Allocated Goodwill									$ 782