Expenses - Restructuring Reserve (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Restructuring Reserve [Roll Forward]
Beginning balance	$ 74	$ 196	$ 198
Net repositioning benefit	78	(3)	133
Payments and Other Adjustments	(64)	(118)	(131)
Ending balance	88	74	196
Employee Related Costs
Restructuring Reserve [Roll Forward]
Beginning balance	68	190	190
Net repositioning benefit	58	(32)	82
Payments and Other Adjustments	(43)	(89)	(78)
Ending balance	83	68	190
Real Estate Actions
Restructuring Reserve [Roll Forward]
Beginning balance	6	6	7
Net repositioning benefit	20	29	51
Payments and Other Adjustments	(21)	(29)	(52)
Ending balance	5	6	6
Asset and Other Write-offs
Restructuring Reserve [Roll Forward]
Beginning balance	0	0	1
Net repositioning benefit	0	0	0
Payments and Other Adjustments	0	0	(1)
Ending balance	$ 0	0	0
State Street Beacon
Restructuring Reserve [Roll Forward]
Net repositioning benefit		(1)	(4)
State Street Beacon | Employee Related Costs
Restructuring Reserve [Roll Forward]
Net repositioning benefit		(1)	(4)
State Street Beacon | Real Estate Actions
Restructuring Reserve [Roll Forward]
Net repositioning benefit		0	0
State Street Beacon | Asset and Other Write-offs
Restructuring Reserve [Roll Forward]
Net repositioning benefit		$ 0	$ 0