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Income Taxes - Changes in Gross Unrecognized Tax Benefits (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]    
Balance at beginning of year $ (483) $ (451)
Additions for tax positions of the current year (32) (71)
Additions for tax positions of prior years (166) (31)
Reductions for tax positions of prior years 42 35
Settlements with tax authorities 95 12
Lapse of statute of limitations 13 23
Balance at end of year $ (531) $ (483)