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Derivative Instruments Fair Value (Details) - USD ($)
$ in Millions
Jun. 30, 2015
Mar. 31, 2015
Designated as hedging instrument | Foreign exchange contract    
Derivatives, Fair Value [Line Items]    
Derivative asset, fair value, gross asset $ 63 $ 67
Derivative liability, fair value, gross liability 0 0
Designated as hedging instrument | Foreign exchange contract | Prepaid expenses and other current assets    
Derivatives, Fair Value [Line Items]    
Derivative asset, fair value, gross asset 13 14
Derivative liability, fair value, gross liability 0 0
Derivative asset, notional amount 76 76
Designated as hedging instrument | Foreign exchange contract | Other assets    
Derivatives, Fair Value [Line Items]    
Derivative asset, fair value, gross asset 50 53
Derivative liability, fair value, gross liability 0 0
Derivative asset, notional amount 323 323
Not designated as hedging instrument    
Derivatives, Fair Value [Line Items]    
Derivative asset, fair value, gross asset 1 7
Derivative liability, fair value, gross liability 51 79
Not designated as hedging instrument | Foreign exchange contract | Prepaid expenses and other current assets    
Derivatives, Fair Value [Line Items]    
Derivative asset, fair value, gross asset 1 7
Derivative liability, fair value, gross liability 0 0
Derivative asset, notional amount 248 493
Not designated as hedging instrument | Foreign exchange contract | Other current liabilities    
Derivatives, Fair Value [Line Items]    
Derivative asset, fair value, gross asset 0 0
Derivative liability, fair value, gross liability 51 79
Derivative liability, notional amount $ 1,754 $ 1,262