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Income Taxes (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Income Tax Disclosure [Abstract]          
Income tax expense (benefit) $ 36 $ (11) $ 144 $ 275  
Non-cash deferred Income tax benefit 51   151    
Unrecognized tax benefits 407   407   $ 348
Decrease in unrecognized tax benefits reasonably possible 75   75    
Unrecognized tax benefits, income tax penalties and interest accrued $ 59   $ 59   $ 53