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Derivatives (Details 2) (Fair value hedges)
In Millions, unless otherwise specified
3 Months Ended 1 Months Ended 3 Months Ended
Mar. 31, 2013
USD ($)
Mar. 31, 2012
USD ($)
Mar. 31, 2013
Interest rate swap contracts
USD ($)
Jul. 31, 2007
Interest rate swap contracts
Fixed rate Eurobond Due 2014
EUR (€)
Aug. 31, 2010
Interest rate swap contracts
Fixed rate Eurobond Due 2014
EUR (€)
Mar. 31, 2013
Interest rate swap contracts
Interest expense
USD ($)
Mar. 31, 2012
Interest rate swap contracts
Interest expense
USD ($)
Derivatives in Cash Flow Hedging Relationships              
Notional amount, interest rate swaps designated as fair value hedges     $ 342 € 400      
Term of debt instrument       7 years      
Face amount       750      
Termination of notional amount of fixed-to-floating interest rate swap         150    
Gain (loss) on termination of fixed-to-floating interest rate swap will be amortized over this debt's remaining life         18    
Gain (Loss) on Derivative Recognized in income (5) (1)       (5) (1)
Gain (Loss) on Hedged Item Recognized in Income $ 5 $ 1       $ 5 $ 1