Goodwill and Other Intangible Assets - Gross Carrying Amount, Accumulated Amortization And Net Carrying Amount Of Other Intangible Assets (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 3,981	$ 3,894
Accumulated Amortization	(2,165)	(2,067)
Net Carrying Amount	1,816	1,827	$ 2,030
Client relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	2,786	2,704
Accumulated Amortization	(1,497)	(1,450)
Net Carrying Amount	1,289	1,254
Technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	403	393
Accumulated Amortization	(142)	(113)
Net Carrying Amount	261	280
Core deposits
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	696	690
Accumulated Amortization	(451)	(425)
Net Carrying Amount	245	265
Other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	96	107
Accumulated Amortization	(75)	(79)
Net Carrying Amount	$ 21	$ 28