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Lawsuits, Claims, Commitments and Contingencies (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2016
Dec. 31, 2015
Lawsuits, commitments and contingencies            
Tentative cash tax refund $ 26 $ 1        
Anticipated cash refund 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