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Lawsuits, Claims, Commitments and Contingencies (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 26, 2021
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Lawsuits, commitments and contingencies          
Potential cash tax   $ 925      
Federal          
Lawsuits, commitments and contingencies          
Potential cash tax   898      
State          
Lawsuits, commitments and contingencies          
Potential cash tax   27      
Anadarko          
Lawsuits, commitments and contingencies          
Tentative cash tax refund   881   $ 881  
Potential accrued interest   $ 270      
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