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Fair Value Measurements Fair Value of Assets and Liabilities on Recurring And Nonrecurring Basis (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Assets and liabilities measured on recurring and nonrecurring basis [Line Items]      
Debt Instrument, Fair Value Disclosure $ 4,779   $ 4,793
Goodwill impairment charges 423 0  
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]      
Time Deposits, at Carrying Value 105    
Accrued Contingent Consideration 642   663
Cash 127   168
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Abstract]      
Cost-method Investments, Aggregate Carrying Amount 17   13
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 36   39
Foreign Currency Contract, Asset, Fair Value Disclosure 217   121
Assets, Fair Value Disclosure 253   160
Currency Hedge Contracts Liabilities 40   57
Accrued Contingent Consideration 642   663
Liabilities, Fair Value Disclosure 682   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 36   39
Foreign Currency Contract, Asset, Fair Value Disclosure        
Assets, Fair Value Disclosure 36   39
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 217   121
Assets, Fair Value Disclosure 217   121
Currency Hedge Contracts Liabilities 40   57
Accrued Contingent Consideration        
Liabilities, Fair Value Disclosure 40   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        
Foreign Currency Contract, Asset, Fair Value Disclosure        
Assets, Fair Value Disclosure        
Currency Hedge Contracts Liabilities        
Accrued Contingent Consideration 642   663
Liabilities, Fair Value Disclosure $ 642   $ 663