Goodwill and Other Intangible Assets - Changes in the Carrying Amount of Goodwill (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2026	Dec. 31, 2025
Goodwill [Roll Forward]
Beginning balance	$ 8,159	$ 7,691
Acquisitions	2	243
Foreign currency translation and other, net	(40)	225
Ending balance	8,121	8,159
Investment Servicing
Goodwill [Roll Forward]
Beginning balance	7,891	7,428
Acquisitions	2	243
Foreign currency translation and other, net	(39)	220
Ending balance	7,854	7,891
Investment Management
Goodwill [Roll Forward]
Beginning balance	268	263
Acquisitions	0	0
Foreign currency translation and other, net	(1)	5
Ending balance	$ 267	$ 268