Goodwill and Purchased Intangible Assets - Goodwill by Segments (Details) $ in Millions	9 Months Ended
	Sep. 30, 2023 USD ($)
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 4,709
Accumulated Impairment, beginning balance	(169)
Total beginning balance	4,540
Additions	0
Impairment	0
Other	(3)
Goodwill, ending balance	4,706
Accumulated Impairment, ending balance	(169)
Total	4,537
Retail
Goodwill [Roll Forward]
Goodwill, beginning balance	995
Accumulated Impairment, beginning balance	(34)
Total beginning balance	961
Additions	0
Impairment	0
Other	(2)
Goodwill, ending balance	993
Accumulated Impairment, ending balance	(34)
Total	959
Hospitality
Goodwill [Roll Forward]
Goodwill, beginning balance	288
Accumulated Impairment, beginning balance	(23)
Total beginning balance	265
Additions	0
Impairment	0
Other	(1)
Goodwill, ending balance	287
Accumulated Impairment, ending balance	(23)
Total	264
Digital Banking
Goodwill [Roll Forward]
Goodwill, beginning balance	594
Accumulated Impairment, beginning balance	0
Total beginning balance	594
Additions	0
Impairment	0
Other	0
Goodwill, ending balance	594
Accumulated Impairment, ending balance	0
Total	594
Payments & Network
Goodwill [Roll Forward]
Goodwill, beginning balance	1,036
Accumulated Impairment, beginning balance	0
Total beginning balance	1,036
Additions	0
Impairment	0
Other	0
Goodwill, ending balance	1,036
Accumulated Impairment, ending balance	0
Total	1,036
Self-Service Banking
Goodwill [Roll Forward]
Goodwill, beginning balance	1,633
Accumulated Impairment, beginning balance	(101)
Total beginning balance	1,532
Additions	0
Impairment	0
Other	0
Goodwill, ending balance	1,633
Accumulated Impairment, ending balance	(101)
Total	1,532
Other
Goodwill [Roll Forward]
Goodwill, beginning balance	163
Accumulated Impairment, beginning balance	(11)
Total beginning balance	152
Additions	0
Impairment	0
Other	0
Goodwill, ending balance	163
Accumulated Impairment, ending balance	(11)
Total	$ 152