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Income Taxes - Unrecognized Tax Benefits (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Unrecognized tax benefits - Beginning of year $ 171 $ 145 $ 49
Increases for assumed tax positions related to First Data 0 0 82
Increases for tax positions taken during the current year 16 9 8
Increases for tax positions taken in prior years 5 53 16
Decreases for tax positions taken in prior years (41) (23) (2)
Decreases for settlements (1) (2) (1)
Lapse of the statute of limitations (26) (11) (7)
Unrecognized tax benefits - End of year $ 124 $ 171 $ 145