Derivatives (Details 1) (Fair value hedges)
In Millions, unless otherwise specified
1 Months Ended 1 Months Ended 3 Months Ended 3 Months Ended
Jul. 31, 2007
Interest rate swap contracts
Eurobond repaid July 2014
EUR (€)
Jul. 31, 2014
Interest rate swap contracts
Eurobond repaid July 2014
EUR (€)
Aug. 31, 2010
Interest rate swap contracts
Eurobond repaid July 2014
EUR (€)
Nov. 30, 2013
Interest rate swap contracts
Eurobond Due 2021
EUR (€)
Jun. 30, 2014
Interest rate swap contracts
Fixed rate medium term note due 2019
USD ($)
Mar. 31, 2015
Derivatives designated as hedging instruments
USD ($)
Mar. 31, 2014
Derivatives designated as hedging instruments
USD ($)
Mar. 31, 2015
Derivatives designated as hedging instruments
Interest rate swap contracts
USD ($)
Mar. 31, 2015
Derivatives designated as hedging instruments
Interest rate swap contracts
Interest expense
USD ($)
Mar. 31, 2014
Derivatives designated as hedging instruments
Interest rate swap contracts
Interest expense
USD ($)
Derivatives in Fair Value Hedging Relationships                    
Derivative notional amount € 400     € 300 $ 600     $ 1,000    
Term of debt instrument 7 years     8 years 5 years          
Face amount 750     600 625          
Termination of notional amount of fixed-to-floating interest rate swap     150              
Remaining amount matured from Interest Rate Swap   250                
Gain (loss) on termination of fixed-to-floating interest rate swap will be amortized over this debt's remaining life     18              
Interest rate, stated percentage (as a percent)       1.875% 1.625%          
Gain (Loss) on Derivative Recognized in income           6 7   6 7
Gain (Loss) on Hedged Item Recognized in Income           $ (6) $ (7)   $ (6) $ (7)