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Other noncurrent liabilities Other noncurrent liabilities(Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Accrued straight-line rent $ 12 $ 13
Reserve for underground storage tank removal 50 41
Reserve for environmental remediation 24 23
Unfavorable lease liability 17 10
Others 19 23
Aloha Acquisition [Member]    
Aloha acquisition contingent consideration $ 15 $ 15