Revenue Recognition (Schedule of Disaggregated Revenue) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Disaggregation of Revenue [Line Items]
Cash and cash equivalents		$ 294	$ 11	$ 461	$ 27
Cash and investments segregated		214	5	308	19
Receivables from brokerage clients		912	628	2,244	1,800
Available for sale securities		1,161	1,187	3,196	3,381
Held to maturity securities		345	0	1,062	0
Bank loans		300	161	717	448
Securities lending revenue		124	159	383	557
Other interest revenue		7	2	15	4
Interest revenue		3,357	2,153	8,386	6,236
Bank deposits		(241)	(14)	(285)	(40)
Payables to brokerage clients		(41)	(3)	(47)	(7)
Short-term borrowings		(4)	(3)	(12)	(6)
Long-term debt		(131)	(99)	(363)	(281)
Securities lending expense		(13)	(4)	(28)	(16)
Other interest expense		(1)	0	2	2
Interest expense		(431)	(123)	(733)	(348)
Net interest revenue		2,926	2,030	7,653	5,888
Other		184	152	608	614
Total net revenues		5,500	4,570	15,265	13,812
Asset management and administration fees [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	[1]	1,047	1,101	3,167	3,164
Asset Management and administration fees, Mutual funds, ETFs, and CTFs [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers		520	503	1,524	1,454
Asset Management and administration fees, Advice solutions [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers		452	511	1,409	1,469
Asset Management and administration fees, Other [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers		75	87	234	241
Trading revenue [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers		930	964	2,778	3,135
Trading revenue, Commissions [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers		435	466	1,362	1,559
Trading revenue, Order Flow Revenue [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers		432	482	1,332	1,538
Trading revenue, Principal Transactions [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers		63	16	84	38
Bank deposit account fees [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers		$ 413	$ 323	$ 1,059	$ 1,011

[1] No fee waivers were recognized for the three months ended September 30, 2022. Includes fee waivers of $57 million for the nine months ended September 30, 2022, and $83 million and $246 million for the three and nine months ended September 30, 2021, respectively.