Revenue Recognition (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Cash and cash equivalents		$ 40	$ 120	$ 518
Cash and investments segregated		24	141	345
Receivables from brokerage clients		2,455	848	821
Available for sale securities		4,641	4,537	1,560
Held to maturity securities		0	0	3,591
Bank loans		620	545	584
Securities lending revenue		720	334	147
Other interest revenue		6	6	14
Interest revenue		8,506	6,531	7,580
Bank deposits		(54)	(93)	(700)
Payables to brokerage clients		(9)	(12)	(79)
Short-term borrowings		(9)	0	0
Long-term debt		(384)	(289)	(258)
Securities lending expense		(24)	(33)	(38)
Other interest expense		4	9	11
Interest expense		(476)	(418)	(1,064)
Net interest revenue		8,030	6,113	6,516
Other		749	332	242
Total net revenues		18,520	11,691	10,721
Asset management and administration fees [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	[1]	4,274	3,475	3,211
Asset Management and administration fees, Mutual funds, ETFs, and CTFs [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers		1,961	1,770	1,747
Asset Management and administration fees, Advice solutions [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers		1,993	1,443	1,198
Asset Management and administration fees, Other [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers		320	262	266
Trading revenue [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers		4,152	1,416	752
Trading revenue, Commissions [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers		2,050	739	549
Trading revenue, Order Flow Revenue [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers		2,053	621	135
Trading revenue, Principal Transactions [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers		49	56	68
Bank deposit account fees [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers		$ 1,315	$ 355	$ 0

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