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Asset Retirement Obligations
 3 Months Ended
Mar. 31, 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 three months ended were as follows:
 
March 31,
(In millions)
2020
 
2019
Beginning balance
$
254

 
$
1,145

Incurred liabilities, including acquisitions
1

 
12

Settled liabilities, including dispositions
(2
)
 
(109
)
Accretion expense (included in depreciation, depletion and amortization)
3

 
13

Revisions of estimates
(9
)
 
11

Held for sale
—

 
(862
)
Ending balance
$
247

 
$
210


March 31, 2020
•
Ending balance includes $11 million classified as short-term at March 31, 2020.
March 31, 2019
•
Settled liabilities primarily relate to the sale of our working interest in the Droshky field (Gulf of Mexico), which closed during the first quarter of 2019.
•
Held for sale includes the asset retirement obligations associated with the sale of our U.K. business, which was partially offset by settled liabilities for dispositions primarily related to the Droshky field in the first quarter of 2019. See Note 4 for discussion of the divestitures in further detail.
•
Ending balance includes $18 million classified as short-term at March 31, 2019.