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Derivative Instruments and Hedging Activities (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Mar. 31, 2016
Derivative [Line Items]          
Remaining maturity of forward foreign exchange contracts, maximum     15 months    
Net unrealized fair value gain (loss) on foreign exchange contracts, effective portion $ (2) $ (1) $ (5) $ 2  
Net unrealized fair value gain (loss) on foreign exchange contracts that did not qualify as effective hedge contracts 0   (1)    
Foreign currency cash flow hedge gain (loss) reclassified to earnings 2   5    
Foreign currency cash flow hedge gain estimated to be reclassified into earnings during next 12 months 1   1    
Other Assets | Foreign Exchange Forward          
Derivative [Line Items]          
Derivative asset 1   1   $ 9
Accounts Payable and Accrued Liabilities | Foreign Exchange Forward          
Derivative [Line Items]          
Derivative liability $ 2   $ 2   $ 1