v3.21.2
Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Feb. 08, 2021
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Business Acquisition [Line Items]          
Income tax provision   $ (1,203) $ 62 $ (2,924) $ 171
Adjustment to valuation allowances: increase (decrease)   $ (4) $ 33 $ (156) $ 264
Effective tax rate   34.00% 12.00% 35.00% 8.00%
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)