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Intangible Assets - Schedule of Future Amortization Expenses (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]    
Remainder of fiscal year 2019 $ 95  
2020 177  
2021 161  
2022 143  
2023 131  
Thereafter 734  
Net Carrying Value $ 1,441 $ 897