Goodwill and Other Intangible Assets - Gross Carrying Amount, Accumulated Amortization and Net Carrying Amount of Other Intangible Assets (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 3,879	$ 3,938
Accumulated Amortization	(2,790)	(2,618)
Net Carrying Amount	1,089	1,320	$ 1,544
Client relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	2,706	2,761
Accumulated Amortization	(1,919)	(1,808)
Net Carrying Amount	787	953
Technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	401	402
Accumulated Amortization	(252)	(216)
Net Carrying Amount	149	186
Core deposits
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	677	690
Accumulated Amortization	(540)	(516)
Net Carrying Amount	137	174
Other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	95	85
Accumulated Amortization	(79)	(78)
Net Carrying Amount	$ 16	$ 7