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Debt - Debt Maturities (Detail) - Long-term Debt and Capital Lease Obligations [Member] - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
2017   $ 40
2017 (remaining) $ 36  
2018 59 50
2019 55 47
2020 56 798
2021 57 1,549
Thereafter 6,455 4,222
Long-term debt and capital lease obligations, including current maturities $ 6,718 $ 6,706