Fair Value Measurements Fair Value of Assets and Liabilities on Recurring And Nonrecurring Basis (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended					12 Months Ended
	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Sep. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Assets and liabilities measured on recurring and nonrecurring basis [Line Items]
Contingent consideration recognized in the period						$ 287	$ 75
Debt Instrument, Decrease, Repayments						1,250
Asset Impairment Charges						718	1,882
Goodwill implied fair value			782		1,479
Debt Instrument, Fair Value Disclosure						4,649	5,654
Goodwill, Impairment Loss			697		1,817	697	1,817
Intangible asset impairment charges	9	12		5	60	21	65	12
Cost-method Investments, Realized Gain (Loss)						15	16
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Time Deposits, at Carrying Value						88	16
Currency Hedge Contracts Liabilities						2,088	2,679
Accrued Contingent Consideration						358	71	6
Cash						101	92
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Abstract]
Cost-method Investments, Aggregate Carrying Amount						16	43
Carrying value of goodwill prior to impairment							1,479
Allocated Goodwill						9,761	10,186	11,936
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability						7	2
Contingent payment related to business combination						7	12
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] | Estimate of Fair Value, Fair Value Disclosure [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Money Market Funds, at Carrying Value						78	105
Foreign Currency Contract, Asset, Fair Value Disclosure						87	82
Assets, Fair Value Disclosure						165	187
Currency Hedge Contracts Liabilities						131	189
Accrued Contingent Consideration						358	71
Liabilities, Fair Value Disclosure						489	260
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	105
Foreign Currency Contract, Asset, Fair Value Disclosure
Assets, Fair Value Disclosure						78	105
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						87	82
Assets, Fair Value Disclosure						87	82
Currency Hedge Contracts Liabilities						131	189
Accrued Contingent Consideration
Liabilities, Fair Value Disclosure						131	189
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						358	71
Liabilities, Fair Value Disclosure						358	71
Reporting Unit One [Member]
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Abstract]
Allocated Goodwill						780
U.S. CRM Reporting Unit [Member]
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Abstract]
Carrying value of goodwill prior to impairment								$ 3,296