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Goodwill and Intangible Assets (Schedule of Future Intangible Asset Amortization Expense) (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Mar. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]    
Remainder of 2018 $ 337  
2019 428  
2020 407  
2021 296  
2022 235  
Thereafter 306  
Net Carrying Amount $ 2,009 $ 2,121