Commitments and Contingencies (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Loss Contingencies [Line Items]
Subscriber funds	$ 1,000		$ 1,700
First Data | First Data Subsidiary Merchant Matters
Loss Contingencies [Line Items]
Payment for legal settlement	28	$ 40
Loss contingency accrual	15		$ 32
Minimum | First Data | First Data Subsidiary Merchant Matters
Loss Contingencies [Line Items]
Estimated range of exposure	0
Maximum | First Data | First Data Subsidiary Merchant Matters
Loss Contingencies [Line Items]
Estimated range of exposure	$ 65