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Future Minimum Lease Payments and Debt Maturities (Detail) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Debt Credit Facilities And Lease Commitments [Abstract]    
2018 $ 129  
2019 107  
2020 84  
2021 69  
2022 63  
Thereafter 246  
Total obligations and commitments 698  
Total debt and lease obligations 698  
2018 3  
2019 2  
2020 302  
2021 402  
2022 210  
Thereafter 2,612  
Total obligations and commitments 3,531  
Discounts, premiums, and adjustments relating to hedging instruments (19)  
Total debt and lease obligations [1] $ 3,512 $ 2,782
[1] Book values include any discounts, premiums and adjustments related to hedging instruments.