Revenue Recognition (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Cash and cash equivalents		$ 812	$ 40	$ 120
Cash and investments segregated		691	24	141
Receivables from brokerage clients		3,321	2,455	848
Available for sale securities		4,139	4,641	4,537
Held to maturity securities		1,688	0	0
Bank loans		1,083	620	545
Securities lending revenue		471	720	334
Other interest revenue		22	6	6
Interest revenue		12,227	8,506	6,531
Bank deposits		(723)	(54)	(93)
Payables to brokerage clients		(123)	(9)	(12)
Short-term borrowings		(154)	(9)	0
Long-term debt		(498)	(384)	(289)
Securities lending expense		(48)	(24)	(33)
Other interest expense		1	4	9
Interest expense		(1,545)	(476)	(418)
Net interest revenue		10,682	8,030	6,113
Other		782	749	332
Total net revenues		20,762	18,520	11,691
Asset management and administration fees [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	[1]	4,216	4,274	3,475
Mutual funds, ETFs, and CTFs [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers		2,055	1,961	1,770
Advice solutions [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers		1,854	1,993	1,443
Other [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers		307	320	262
Trading revenue [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers		3,673	4,152	1,416
Commissions [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers		1,787	2,050	739
Order flow revenue [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers		1,738	2,053	621
Principal transactions [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers		148	49	56
Bank deposit account fees [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers		$ 1,409	$ 1,315	$ 355

[1] Includes fee waivers of $57 million, $326 million, and $127 million for the years ended December 31, 2022, 2021, and 2020, respectively.