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Other Long-Term Liabilities - Particulars of Other Long-Term Liabilities (Detail) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Statement of Financial Position [Abstract]    
Long-term portion of fair value of hedges $ 17 $ 61
Long-term portion of income taxes payable 225 181
Asset retirement obligation 34 28
Long-term lease inducements 15 16
Deferred revenue 13 12
Total $ 304 $ 298