Goodwill and Other Intangible Assets - Changes in the Carrying Amount of Other Intangible Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Finite-lived Intangible Assets [Roll Forward]
Beginning balance	$ 1,089	$ 1,320
Acquisitions	34	20
Amortization	(223)	(230)	$ (239)
Foreign currency translation	35	(21)
Ending balance	935	1,089	1,320
Investment Servicing
Finite-lived Intangible Assets [Roll Forward]
Beginning balance	1,063	1,293
Acquisitions	34	7
Amortization	(216)	(216)
Foreign currency translation	35	(21)
Ending balance	916	1,063	1,293
Investment Management
Finite-lived Intangible Assets [Roll Forward]
Beginning balance	26	27
Acquisitions	0	13
Amortization	(7)	(14)
Foreign currency translation	0	0
Ending balance	$ 19	$ 26	$ 27