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Other noncurrent liabilities Other noncurrent liabilities(Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Other Noncurrent Liabilities [Abstract]    
Accrued Environmental Loss Contingencies, Noncurrent $ 33 $ 35
Off-market Lease, Unfavorable 28 30
Other Sundry Liabilities, Noncurrent 48 36
Deferred Rent Credit, Noncurrent 11 10
Reserve for underground storage tank removal $ 58 $ 53