Segment Information and Concentrations - Revenue and Operating Income By Segments (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Total revenue	$ 1,589	$ 1,783	$ 4,576	$ 5,029
Income (loss) from operations	118	172	284	429
Operating Segments
Segment Reporting Information [Line Items]
Total revenue	1,589	1,783	4,576	5,029
Segment operating income	158	202	378	541
Segment Reconciling Items
Segment Reporting Information [Line Items]
Transformation and restructuring costs	19	7	32	47
Acquisition-related amortization of intangible assets	21	22	62	64
Acquisition Related Costs Included In Other Adjustments	0	1	0	1
Other adjustments	40	30	94	112
Banking | Operating Segments
Segment Reporting Information [Line Items]
Total revenue	777	942	2,303	2,568
Segment operating income	99	146	294	370
Retail | Operating Segments
Segment Reporting Information [Line Items]
Total revenue	556	539	1,511	1,608
Segment operating income	45	36	67	102
Hospitality | Operating Segments
Segment Reporting Information [Line Items]
Total revenue	173	216	502	611
Segment operating income	7	10	(2)	39
Other | Operating Segments
Segment Reporting Information [Line Items]
Total revenue	83	86	260	242
Segment operating income	$ 7	$ 10	$ 19	$ 30