Goodwill and Long-Lived Assets - Goodwill by Segments (Details) $ in Millions	3 Months Ended
	Mar. 31, 2021 USD ($)
Goodwill [Roll Forward]
Goodwill	$ 3,006
Accumulated Impairment Losses	(169)
Total	2,837
Acquired Goodwill	86
Impairment	0
Other	1
Goodwill	3,093
Accumulated Impairment Losses	(169)
Total	2,924
Banking
Goodwill [Roll Forward]
Goodwill	1,772
Accumulated Impairment Losses	(101)
Total	1,671
Acquired Goodwill	39
Impairment	0
Other	1
Goodwill	1,812
Accumulated Impairment Losses	(101)
Total	1,711
Retail
Goodwill [Roll Forward]
Goodwill	643
Accumulated Impairment Losses	(34)
Total	609
Acquired Goodwill	38
Impairment	0
Other	2
Goodwill	683
Accumulated Impairment Losses	(34)
Total	649
Hospitality
Goodwill [Roll Forward]
Goodwill	404
Accumulated Impairment Losses	(23)
Total	381
Acquired Goodwill	9
Impairment	0
Other	(2)
Goodwill	411
Accumulated Impairment Losses	(23)
Total	388
T&T
Goodwill [Roll Forward]
Goodwill	187
Accumulated Impairment Losses	(11)
Total	176
Acquired Goodwill	0
Impairment	0
Other	0
Goodwill	187
Accumulated Impairment Losses	(11)
Total	$ 176