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Lawsuits, Claims, Commitments and Contingencies (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Lawsuits, commitments and contingencies            
Tentative cash tax refund $ 223   $ 5      
Anticipated cash refund $ 195 $ 195        
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