v3.21.2
Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Feb. 08, 2021
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Business Acquisition [Line Items]          
Income tax provision   $ (989) $ 257 $ (1,721) $ 109
Adjustment to valuation allowances: increase (decrease)   $ (87) $ (117) $ (151) $ 229
Effective tax rate   32.00%   36.00% 7.00%
Concho Resources Incorporated [Member]          
Business Acquisition [Line Items]          
Unrecognized Tax Benefits, Increase Resulting from Acquisition       $ 150  
Reversal of deferred tax assets       (1,100)  
Income tax provision $ (75)     $ (75)