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Other Noncurrent Liabilities (Tables)
 12 Months Ended
Dec. 31, 2017
Other Liabilities Disclosure [Abstract]  
Other Noncurrent Liabilities
Other noncurrent liabilities consisted of the following:
 
December 31, 2017
 
December 31, 2016
 
(in millions)
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

Aloha acquisition contingent consideration
15

 
15

Others
23

 
10

Total
$
125

 
$
116
Schedule of Change in Asset Retirement Obligation
Changes in the carrying amount of asset retirement obligations for the years ended December 31, 2017 and 2016 were as follows:
 
Year Ended December 31,
 
2017
 
2016
 
(in millions)
Balance at beginning of year
$
34

 
$
34

Liabilities incurred
3

 
3

Liabilities settled
(2
)
 
(1
)
Accretion expense
6

 
4

Revision of estimated cash flows
—

 
(6
)
Balance at end of year
$
41

 
$
34