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Income Taxes, Unrecognized Tax Benefits (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Taxes [Abstract]      
Deferred taxes on undistributed earnings of subsidiaries $ 0    
Unrecognized Tax Benefits [Roll Forward]      
Balance at January 1 121 $ 58 $ 84
Additions for tax positions related to the current year 68 86 3
Additions for tax positions related to a prior year   2 20
Reductions for tax positions related to a prior year   (23) (48)
Lapse of statute of limitations   (2) (1)
Reduction due to deconsolidation of Diamond Offshore (187)    
Balance at December 31 $ 2 $ 121 $ 58