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Asset Retirement Obligations | 12 Months Ended
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Dec. 31, 2020
Asset Retirement Obligation Disclosure [Abstract] |
Asset Retirement Obligations | Asset Retirement Obligations The components of the change in our asset retirement obligations are shown below:
|  | Years Ended December 31,
|  | 2020 |  | 2019
|  | ($ in millions)
Asset retirement obligations, beginning of period |  | $ | 211 |  |  | $ | 166 |
Additions(a) |  | 1 |  |  | 21 |
Revisions |  | (14) |  |  | 18 |
Settlements and disposals(b) |  | (66) |  |  | (5) |
Accretion expense |  | 12 |  |  | 11 |
Asset retirement obligations, end of period |  | 144 |  |  | 211 |
Less current portion |  | 5 |  |  | 11 |
Asset retirement obligation, long-term |  | $ | 139 |  |  | $ | 200 |
___________________________________________ (a) During 2019, approximately $17 million of additions relate to the acquisition of WildHorse. (b) During 2020, approximately $49 million and $14 million of disposals related to our Mid-Continent and Haynesville assets, respectively. See Note 3 for further discussion of these transactions.

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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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