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Income Taxes (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Income Tax Disclosure [Abstract]    
Total income tax expense (benefit) $ 636 $ (58)
Effective Income Tax Rate, Percent 18.60% 17.20%
Federal Statutory Income Tax Rate, Percent 21.00%  
High Tax Exception Percentage 18.90%  
Percentage of the Effective Income Tax Rate Rec at Federal Statutory Income 90.00%