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Asset Retirement Obligations | 12 Months Ended
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Dec. 31, 2021
Asset Retirement Obligation Disclosure [Abstract] |
Asset Retirement Obligations | Asset Retirement Obligations Activity related to the Company's asset retirement obligations is as follows:
|  | Year Ended December 31,
(In millions) |  | 2021 |  | 2020
Balance at beginning of period |  | $ | 86 |  |  | $ | 72 |
Liabilities assumed in Merger |  | 175 |  |  | — |
Liabilities incurred |  | 6 |  |  | 10 |
Liabilities settled |  | (10) |  |  | — |
Accretion expense |  | 6 |  |  | 4 |
Balance at end of period |  | 263 |  |  | 86 |
Less: current asset retirement obligation |  | (4) |  |  | (1) |
Noncurrent asset retirement obligation |  | $ | 259 |  |  | $ | 85 |

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- Definition The entire disclosure for an asset retirement obligation and the associated long-lived asset. An asset retirement obligation is a legal obligation associated with the disposal or retirement from service of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -URI http://asc.fasb.org/subtopic&trid=2175671 + Details
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