Bank Deposits - Deposits from Banking Clients Consisting of Interest Bearing and Noninterest Bearing Deposits (Details) - USD ($)		Dec. 31, 2023	Dec. 31, 2022
Interest-bearing deposits:
Deposits swept from brokerage accounts		$ 220,274,000,000	$ 333,754,000,000
Time certificates of deposit		48,297,000,000	6,047,000,000
Checking		15,691,000,000	19,719,000,000
Savings and other		4,461,000,000	6,098,000,000
Total interest-bearing deposits		288,723,000,000	365,618,000,000
Non-interest-bearing deposits		1,230,000,000	1,106,000,000
Total bank deposits	[1]	$ 289,953,000,000	$ 366,724,000,000
Weighted-average interest rates on outstanding time certificates of deposit		5.15%	4.75%
Uninsured time CDs and time deposits in excess of FDIC insurance limits		$ 0	$ 0

[1] Certain prior year amounts have been reclassified to conform to the current year presentation. See Note 1 for additional information.