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Other Noncurrent Liabilities (Tables) | 12 Months Ended
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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 |

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- Definition Tabular disclosure of other noncurrent liabilities. + References No definition available. + Details
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- Definition Tabular disclosure of the changes in carrying amount of a liability for asset retirement obligations, for changes such as new obligations, changes in estimates of existing obligations, spending on existing obligations, property dispositions, and foreign currency translation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13201-110859 + Details
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