Goodwill and Other Intangible Assets - Changes in the Carrying Amount of Goodwill (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2024	Dec. 31, 2023
Goodwill [Roll Forward]
Beginning balance	$ 7,611	$ 7,495
Acquisitions	193	44
Foreign currency translation	(53)	72
Ending balance	7,751	7,611
Investment Servicing
Goodwill [Roll Forward]
Beginning balance	7,346	7,232
Acquisitions	193	44
Foreign currency translation	(52)	70
Ending balance	7,487	7,346
Investment Management
Goodwill [Roll Forward]
Beginning balance	265	263
Acquisitions	0	0
Foreign currency translation	(1)	2
Ending balance	$ 264	$ 265