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Intangible Assets - Schedule of Future Amortization Expenses (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]    
2020 $ 199  
2021 181  
2022 157  
2023 145  
2024 134  
Thereafter 650  
Net Carrying Value $ 1,466 $ 897