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Other Noncurrent Liabilities - Other Noncurrent Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Other Liabilities Disclosure [Abstract]    
Accrued straight-line rent $ 13 $ 10
Reserve for underground storage tank removal 41 34
Reserve for environmental remediation, long-term 23 35
Unfavorable lease liability 10 12
Others 23 10
Other noncurrent liabilities $ 125 $ 116