Goodwill and Other Intangible Assets - Changes in the Carrying Amount of Other Intangible Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Finite-lived Intangible Assets [Roll Forward]
Beginning balance	$ 1,320	$ 1,544
Acquisitions	20
Amortization	(230)	(239)	$ (238)
Foreign currency translation	(21)	15
Ending balance	1,089	1,320	1,544
Investment Servicing
Finite-lived Intangible Assets [Roll Forward]
Beginning balance	1,293	1,495
Acquisitions	7
Amortization	(216)	(217)
Foreign currency translation	(21)	15
Ending balance	1,063	1,293	1,495
Investment Management
Finite-lived Intangible Assets [Roll Forward]
Beginning balance	27	49
Acquisitions	13
Amortization	(14)	(22)
Foreign currency translation	0	0
Ending balance	$ 26	$ 27	$ 49