Segment Information and Concentrations - Revenue and Operating Income By Segments (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Segment Reporting Information [Line Items]
Total revenue	$ 1,710	$ 1,537	$ 3,246	$ 3,054
Asset Impairment Charges	0	183	0	183
Income (loss) from operations	157	(106)	257	3
Operating Segments
Segment Reporting Information [Line Items]
Total revenue	1,710	1,537	3,246	3,054
Segment operating income	192	165	339	313
Segment Reconciling Items
Segment Reporting Information [Line Items]
Transformation and restructuring costs	14	66	40	82
Asset Impairment Charges	0	183	0	183
Acquisition-related amortization of intangible assets	21	21	42	44
Acquisition Related Costs Included In Other Adjustments	0	1	0	1
Other adjustments	35	271	82	310
Banking | Operating Segments
Segment Reporting Information [Line Items]
Total revenue	868	725	1,626	1,446
Segment operating income	129	94	224	178
Retail | Operating Segments
Segment Reporting Information [Line Items]
Total revenue	558	537	1,069	1,058
Segment operating income	40	41	66	76
Hospitality | Operating Segments
Segment Reporting Information [Line Items]
Total revenue	202	198	395	402
Segment operating income	13	19	29	38
Other | Operating Segments
Segment Reporting Information [Line Items]
Total revenue	82	77	156	148
Segment operating income	$ 10	$ 11	$ 20	$ 21