Exit and Other Related Liabilities (Summary of the Cumulative Acquisition-Related Exit Costs) (Details) - USD ($) $ in Millions	12 Months Ended		15 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2021
Restructuring Cost and Reserve [Line Items]
Exit and other related costs incurred in period	$ 108	$ 186	$ 294
Compensation and benefits [Member]
Restructuring Cost and Reserve [Line Items]
Exit and other related costs incurred in period	83	176	259
Occupancy and equipment [Member]
Restructuring Cost and Reserve [Line Items]
Exit and other related costs incurred in period	22	7	29
Depreciation and amortization [Member]
Restructuring Cost and Reserve [Line Items]
Exit and other related costs incurred in period		3	3
Professional services [Member]
Restructuring Cost and Reserve [Line Items]
Exit and other related costs incurred in period	1		1
Other [Member]
Restructuring Cost and Reserve [Line Items]
Exit and other related costs incurred in period	2		2
Investor Services [Member]
Restructuring Cost and Reserve [Line Items]
Exit and other related costs incurred in period	87	146	233
Investor Services [Member] | Compensation and benefits [Member]
Restructuring Cost and Reserve [Line Items]
Exit and other related costs incurred in period	66	138	204
Investor Services [Member] | Occupancy and equipment [Member]
Restructuring Cost and Reserve [Line Items]
Exit and other related costs incurred in period	18	6	24
Investor Services [Member] | Depreciation and amortization [Member]
Restructuring Cost and Reserve [Line Items]
Exit and other related costs incurred in period		2	2
Investor Services [Member] | Professional services [Member]
Restructuring Cost and Reserve [Line Items]
Exit and other related costs incurred in period	1		1
Investor Services [Member] | Other [Member]
Restructuring Cost and Reserve [Line Items]
Exit and other related costs incurred in period	2		2
Investor Services [Member] | Employee Compensation and Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Exit and other related costs incurred in period	66	138	204
Investor Services [Member] | Employee Compensation and Benefits [Member] | Compensation and benefits [Member]
Restructuring Cost and Reserve [Line Items]
Exit and other related costs incurred in period	66	138	204
Investor Services [Member] | Employee Compensation and Benefits [Member] | Occupancy and equipment [Member]
Restructuring Cost and Reserve [Line Items]
Exit and other related costs incurred in period	0	0	0
Investor Services [Member] | Employee Compensation and Benefits [Member] | Depreciation and amortization [Member]
Restructuring Cost and Reserve [Line Items]
Exit and other related costs incurred in period		0	0
Investor Services [Member] | Employee Compensation and Benefits [Member] | Professional services [Member]
Restructuring Cost and Reserve [Line Items]
Exit and other related costs incurred in period	0		0
Investor Services [Member] | Employee Compensation and Benefits [Member] | Other [Member]
Restructuring Cost and Reserve [Line Items]
Exit and other related costs incurred in period	0		0
Investor Services [Member] | Facility Exit Costs [Member]
Restructuring Cost and Reserve [Line Items]
Exit and other related costs incurred in period	21	8	29
Investor Services [Member] | Facility Exit Costs [Member] | Compensation and benefits [Member]
Restructuring Cost and Reserve [Line Items]
Exit and other related costs incurred in period	0	0	0
Investor Services [Member] | Facility Exit Costs [Member] | Occupancy and equipment [Member]
Restructuring Cost and Reserve [Line Items]
Exit and other related costs incurred in period	18	6	24
Investor Services [Member] | Facility Exit Costs [Member] | Depreciation and amortization [Member]
Restructuring Cost and Reserve [Line Items]
Exit and other related costs incurred in period		2	2
Investor Services [Member] | Facility Exit Costs [Member] | Professional services [Member]
Restructuring Cost and Reserve [Line Items]
Exit and other related costs incurred in period	1		1
Investor Services [Member] | Facility Exit Costs [Member] | Other [Member]
Restructuring Cost and Reserve [Line Items]
Exit and other related costs incurred in period	2		2
Advisor Services [Member]
Restructuring Cost and Reserve [Line Items]
Exit and other related costs incurred in period	21	40	61
Advisor Services [Member] | Compensation and benefits [Member]
Restructuring Cost and Reserve [Line Items]
Exit and other related costs incurred in period	17	38	55
Advisor Services [Member] | Occupancy and equipment [Member]
Restructuring Cost and Reserve [Line Items]
Exit and other related costs incurred in period	4	1	5
Advisor Services [Member] | Depreciation and amortization [Member]
Restructuring Cost and Reserve [Line Items]
Exit and other related costs incurred in period		1	1
Advisor Services [Member] | Professional services [Member]
Restructuring Cost and Reserve [Line Items]
Exit and other related costs incurred in period	0		0
Advisor Services [Member] | Other [Member]
Restructuring Cost and Reserve [Line Items]
Exit and other related costs incurred in period	0		0
Advisor Services [Member] | Employee Compensation and Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Exit and other related costs incurred in period	17	38	55
Advisor Services [Member] | Employee Compensation and Benefits [Member] | Compensation and benefits [Member]
Restructuring Cost and Reserve [Line Items]
Exit and other related costs incurred in period	17	38	55
Advisor Services [Member] | Employee Compensation and Benefits [Member] | Occupancy and equipment [Member]
Restructuring Cost and Reserve [Line Items]
Exit and other related costs incurred in period	0	0	0
Advisor Services [Member] | Employee Compensation and Benefits [Member] | Depreciation and amortization [Member]
Restructuring Cost and Reserve [Line Items]
Exit and other related costs incurred in period		0	0
Advisor Services [Member] | Employee Compensation and Benefits [Member] | Professional services [Member]
Restructuring Cost and Reserve [Line Items]
Exit and other related costs incurred in period	0		0
Advisor Services [Member] | Employee Compensation and Benefits [Member] | Other [Member]
Restructuring Cost and Reserve [Line Items]
Exit and other related costs incurred in period	0		0
Advisor Services [Member] | Facility Exit Costs [Member]
Restructuring Cost and Reserve [Line Items]
Exit and other related costs incurred in period	4	2	6
Advisor Services [Member] | Facility Exit Costs [Member] | Compensation and benefits [Member]
Restructuring Cost and Reserve [Line Items]
Exit and other related costs incurred in period	0	0	0
Advisor Services [Member] | Facility Exit Costs [Member] | Occupancy and equipment [Member]
Restructuring Cost and Reserve [Line Items]
Exit and other related costs incurred in period	4	1	5
Advisor Services [Member] | Facility Exit Costs [Member] | Depreciation and amortization [Member]
Restructuring Cost and Reserve [Line Items]
Exit and other related costs incurred in period		$ 1	1
Advisor Services [Member] | Facility Exit Costs [Member] | Professional services [Member]
Restructuring Cost and Reserve [Line Items]
Exit and other related costs incurred in period	0		0
Advisor Services [Member] | Facility Exit Costs [Member] | Other [Member]
Restructuring Cost and Reserve [Line Items]
Exit and other related costs incurred in period	$ 0		$ 0