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Commitments and Contingencies - Future Minimum Lease Payments under Non-cancelable Operating Leases (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Mar. 31, 2017
Future minimum lease payments under non-cancelable operating leases    
2018 $ 17  
2019 14  
2020 9  
2021 5  
2022 8  
Thereafter 2  
Total $ 55 $ 59