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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2019
Asset Retirement Obligation Disclosure [Abstract]  
Schedule of Change in Asset Retirement Obligation
Asset retirement obligations primarily consist of estimated costs to remove, dismantle and restore land at the end of oil and gas production operations. Changes in asset retirement obligations for the periods ended December 31 were as follows:
(In millions)
2019
 
2018
Beginning balance
$
1,145

 
$
1,483

Incurred liabilities, including acquisitions
34

 
21

Settled liabilities, including dispositions
(1,110
)
 
(117
)
Accretion expense (included in depreciation, depletion and amortization)
31

 
70

Revisions of estimates
46

 
(204
)
Held for sale(a)
108

 
(108
)
Ending balance(b)
$
254

 
$
1,145