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Other Noncurrent Liabilities | 12 Months Ended
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Dec. 31, 2017
Other Liabilities Disclosure [Abstract] |
Other Noncurrent Liabilities | 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 |
We record an asset retirement obligation for the estimated future cost to remove underground storage tanks. Revisions to the liability could occur due to changes in tank removal costs, tank useful lives or if federal and/or state regulators enact new guidance on the removal of such tanks. 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 |

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- Definition The entire disclosure for accounts payable, accrued expenses, and other liabilities that are classified as noncurrent at the end of the reporting period. + References No definition available. + Details
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