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Goodwill and Intangible Assets (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]        
Amortization of intangible assets $ 7 $ 1 $ 8 $ 2
Estimated remaining amortization expense, year ended March 31, 2017 27   27  
Estimated amortization expense, year ended March 31, 2018 106   106  
Estimated amortization expense, year ended March 31, 2019 106   106  
Estimated amortization expense, year ended March 31, 2020 106   106  
Estimated amortization expense, year ended March 31, 2021 $ 106   $ 106