v3.21.1
Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended
Feb. 08, 2021
Mar. 31, 2021
Mar. 31, 2020
Business Acquisition [Line Items]      
Effective tax rate   42.70% (9.50%)
Adjustment to valuation allowances   $ 65 $ (346)
Income tax provision   732 $ 148
Concho Resources Inc [Member]      
Business Acquisition [Line Items]      
Income tax provision $ 75 75  
Increase (Decrease) in Deferred Income Taxes   1,100  
Unrecognized Tax Benefits, Increase Resulting from Acquisition   $ 150