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Hedging Activities - Derivative Instruments Fair Value (Details) - USD ($)
$ in Millions
Sep. 30, 2015
Mar. 31, 2015
Derivatives not designated for hedge accounting    
Derivatives, Fair Value [Line Items]    
Fair value of derivative, Asset $ 26 $ 7
Fair value of derivative, liability 7 79
Foreign Exchange Contract | Derivatives designated for hedge accounting    
Derivatives, Fair Value [Line Items]    
Fair value of derivative, Asset 86 67
Fair value of derivative, liability 0 0
Foreign Exchange Contract | Derivatives designated for hedge accounting | Prepaid expenses and other    
Derivatives, Fair Value [Line Items]    
Fair value of derivative, Asset 17 14
Fair value of derivative, liability 0 0
U.S. Dollar notional amount, asset 76 76
Foreign Exchange Contract | Derivatives designated for hedge accounting | Other assets    
Derivatives, Fair Value [Line Items]    
Fair value of derivative, Asset 69 53
Fair value of derivative, liability 0 0
U.S. Dollar notional amount, asset 323 323
Foreign Exchange Contract | Derivatives not designated for hedge accounting | Prepaid expenses and other    
Derivatives, Fair Value [Line Items]    
Fair value of derivative, Asset 26 7
Fair value of derivative, liability 0 0
U.S. Dollar notional amount, asset 1,769 493
Foreign Exchange Contract | Derivatives not designated for hedge accounting | Other accrued liabilities    
Derivatives, Fair Value [Line Items]    
Fair value of derivative, Asset 0 0
Fair value of derivative, liability 7 79
U.S. Dollar, notional amount, liability $ 125 $ 1,262