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Lawsuits, Claims, Commitments and Contingencies (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2020
Lawsuits, commitments and contingencies              
Tentative cash tax refund     $ 96 $ 2      
Anticipated cash refund     170        
Forecast              
Lawsuits, commitments and contingencies              
Anticipated cash refund             $ 25
Anadarko              
Lawsuits, commitments and contingencies              
Tentative cash tax refund $ 881   $ 881        
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%    
Own economic interest (as a percent)         60.00%    
Tronox Settlement              
Lawsuits, commitments and contingencies              
Payments for settlement   $ 5,200