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Asset Retirement Obligations (Tables)
 3 Months Ended
Mar. 31, 2019
Asset Retirement Obligation Disclosure [Abstract]  
Schedule of Changes in 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)
2019
 
2018
Beginning balance
$
1,145

 
$
1,483

Incurred liabilities, including acquisitions
12

 
4

Settled liabilities, including dispositions
(109
)
 
(8
)
Accretion expense (included in depreciation, depletion and amortization)
13

 
18

Revisions of estimates
11

 
—

Held for sale
(862
)
 
—

Ending balance
$
210

 
$
1,497