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Commitments and Contingencies - Future Minimum Lease Payments under Non-cancelable Operating Leases (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Mar. 31, 2016
Future minimum lease payments under non-cancelable operating leases    
2017 $ 6  
2018 21  
2019 13  
2020 8  
2021 5  
Thereafter 11  
Total $ 64 $ 55