Goodwill and Other Intangible Assets - Gross Carrying Amount, Accumulated Amortization and Net Carrying Amount of Other Intangible Assets (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 4,060	$ 3,879
Accumulated Amortization	(3,125)	(2,790)
Net Carrying Amount	935	1,089	$ 1,320
Client relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	2,831	2,706
Accumulated Amortization	(2,144)	(1,919)
Net Carrying Amount	687	787
Technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	405	401
Accumulated Amortization	(293)	(252)
Net Carrying Amount	112	149
Core deposits
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	703	677
Accumulated Amortization	(597)	(540)
Net Carrying Amount	106	137
Other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	121	95
Accumulated Amortization	(91)	(79)
Net Carrying Amount	$ 30	$ 16