Goodwill and Other Intangible Assets - Changes in the Carrying Amount of Goodwill (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2024	Dec. 31, 2023
Goodwill [Roll Forward]
Beginning balance	$ 7,611	$ 7,495
Acquisitions	194	44
Foreign currency translation	28	72
Ending balance	7,833	7,611
Investment Servicing
Goodwill [Roll Forward]
Beginning balance	7,346	7,232
Acquisitions	194	44
Foreign currency translation	27	70
Ending balance	7,567	7,346
Investment Management
Goodwill [Roll Forward]
Beginning balance	265	263
Acquisitions	0	0
Foreign currency translation	1	2
Ending balance	$ 266	$ 265