Segment Information and Concentrations - Revenue and Operating Income By Segments (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Segment Reporting Information [Line Items]
Total revenue	$ 1,484	$ 1,710	$ 2,987	$ 3,246
Income (loss) from operations	89	157	166	257
Operating Segments
Segment Reporting Information [Line Items]
Total revenue	1,484	1,710	2,987	3,246
Segment operating income	116	192	220	339
Segment Reconciling Items
Segment Reporting Information [Line Items]
Transformation and restructuring costs	8	14	13	40
Acquisition-related amortization of intangible assets	19	21	41	42
Other adjustments	27	35	54	82
Banking | Operating Segments
Segment Reporting Information [Line Items]
Total revenue	763	868	1,526	1,626
Segment operating income	92	129	195	224
Retail | Operating Segments
Segment Reporting Information [Line Items]
Total revenue	483	558	955	1,069
Segment operating income	17	40	22	66
Hospitality | Operating Segments
Segment Reporting Information [Line Items]
Total revenue	160	202	329	395
Segment operating income	0	13	(9)	29
Other | Operating Segments
Segment Reporting Information [Line Items]
Total revenue	78	82	177	156
Segment operating income	$ 7	$ 10	$ 12	$ 20