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Goodwill and Intangible Assets (Finite-Lived Intangible Assets) (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Mar. 31, 2016
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 1,790 $ 18
Accumulated Amortization 16 7
Net Carrying Amount 1,774 11
Customer relationships    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 1,771 0
Accumulated Amortization 7 0
Net Carrying Amount 1,764 0
Trademarks and trade names    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 9 9
Accumulated Amortization 7 7
Net Carrying Amount 2 2
Other    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 10 9
Accumulated Amortization 2 0
Net Carrying Amount $ 8 $ 9