Revenue Recognition - Disaggregation of Revenue (Details) $ in Millions	3 Months Ended
	Mar. 31, 2018 USD ($)
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 1,440
Digital Money Movement
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	352
Card and Related Services
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	414
Other
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	76
Account and Item Processing
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	506
Lending Solutions
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	56
Other
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	54
Total Financial
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	616
Payments
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	842
Payments | Digital Money Movement
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	352
Payments | Card and Related Services
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	414
Payments | Other
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	76
Payments | Total Payments
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	842
Payments | Account and Item Processing
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0
Payments | Lending Solutions
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0
Payments | Other
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0
Payments | Total Financial
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0
Financial
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	616
Financial | Digital Money Movement
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0
Financial | Card and Related Services
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0
Financial | Other
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0
Financial | Total Payments
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0
Financial | Account and Item Processing
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	506
Financial | Lending Solutions
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	56
Financial | Other
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	54
Financial | Total Financial
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	616
Corporate and Other
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	(18)
Corporate and Other | Digital Money Movement
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0
Corporate and Other | Card and Related Services
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0
Corporate and Other | Other
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0
Corporate and Other | Total Payments
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0
Corporate and Other | Account and Item Processing
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0
Corporate and Other | Lending Solutions
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0
Corporate and Other | Other
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0
Corporate and Other | Total Financial
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0
Corporate and Other | Payments
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0
Corporate and Other | Financial
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 0
Geographic Concentration Risk | Sales Revenue, Net | Foreign Tax Authority
Disaggregation of Revenue [Line Items]
Percentage of concentration risk	5.00%