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Lawsuits, Claims, Commitments and Contingencies (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 26, 2021
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Sep. 30, 2021
Lawsuits, commitments and contingencies          
Potential cash tax         $ 1,000
Federal          
Lawsuits, commitments and contingencies          
Potential cash tax         996
State          
Lawsuits, commitments and contingencies          
Potential cash tax         27
Anadarko          
Lawsuits, commitments and contingencies          
Tentative cash tax refund     $ 881    
Potential accrued interest         $ 300
Arbitration filed by Andes Petroleum Ecuador Ltd          
Lawsuits, commitments and contingencies          
Proceeds from settlement     $ 1,000    
Recovery of amount awarded in settlement amount (as a percent)     60.00%    
Percentage of judgment amount claimed 40.00% 40.00%      
Own economic interest (as a percent)   60.00%      
Amount awarded to other party in litigation $ 391        
Tronox Settlement          
Lawsuits, commitments and contingencies          
Payments for settlement       $ 5,200