Commitments and Contingencies (Details) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2020	Mar. 31, 2021	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	$ 40
Loss contingency accrual		33	$ 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		$ 60