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Commitments and Contingencies - Future Minimum Lease Payments under Non-cancelable Operating Leases (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Mar. 31, 2015
Future minimum lease payments under non-cancelable operating leases    
2016 $ 5  
2017 21  
2018 17  
2019 9  
2020 4  
Thereafter 3  
Total $ 59 $ 60