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Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits - Beginning of year	$ 49	$ 42	$ 45
Increases for assumed tax positions related to First Data	82	0	0
Increases for tax positions taken during the current year	8	3	11
Increases for tax positions taken in prior years	16	20	2
Decreases for tax positions taken in prior years	(2)	(8)	(15)
Decreases for settlements	(1)	0	(1)
Lapse of the statute of limitations	(7)	(8)	0
Unrecognized tax benefits - End of year	$ 145	$ 49	$ 42

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of unrecognized tax benefits.

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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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