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Asset Retirement Obligations
 9 Months Ended
Sep. 30, 2020
Asset Retirement Obligation Disclosure [Abstract]  
Asset Retirement Obligations Asset Retirement Obligations
Asset retirement obligations primarily consist of estimated costs to remove, dismantle and restore land or seabed at the end of oil and gas production operations. Changes in asset retirement obligations for the nine months ended September 30 were as follows:
September 30,
(In millions)20202019
Beginning balance as of January 1$255 $1,145 
Incurred liabilities, including acquisitions3 25 
Settled liabilities, including dispositions(11)(1,106)
Accretion expense (included in depreciation, depletion and amortization)9 29 
Revisions of estimates(8)15 
Held for sale— 108 
Ending balance as of September 30$248 $216 
September 30, 2020
•Ending balance includes $12 million classified as short-term at September 30, 2020.
September 30, 2019
•Settled liabilities primarily relate to the sale of our U.K. business, which closed during the third quarter of 2019.
•Held for sale reflects a transfer to settled liabilities during 2019. This transfer was primarily related to the Droshky field (Gulf of Mexico), which was considered held for sale at year-end 2018 and closed in the first quarter of 2019.