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Income Taxes - Uncertain Tax Positions (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Unrecognized Tax Benefits [Roll Forward]      
Balance at beginning of period $ 1,086 $ 775 $ 1,341
Additions to current year tax positions 22 435 18
Additions to prior years' tax positions 46 26 13
Reductions to prior years' tax positions (473) (132) (501)
Reductions in tax positions due to lapse of statutory limitations (17) (3) (8)
Settlements (26) (10) (93)
Other (4) (5) 5
Balance at end of period 634 1,086 $ 775
Unrecognized tax benefit that would favorably affect effective tax rate 411 851  
Income tax related interest and penalties accrual $ 86 $ 92