Revenue Recognition (Schedule of Disaggregated Revenue) (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Disaggregation of Revenue [Line Items]
Cash and cash equivalents		$ 547	$ 133	$ 960	$ 167
Cash and investments segregated		324	79	756	94
Receivables from brokerage clients		1,167	706	2,251	1,332
Available for sale securities		791	1,088	1,616	2,035
Held to maturity securities		720	339	1,466	717
Bank loans		410	230	801	417
Securities lending revenue		124	130	236	259
Other interest revenue		21	5	34	8
Interest revenue		4,104	2,710	8,120	5,029
Bank deposits		(863)	(28)	(1,481)	(44)
Payables to brokerage clients		(64)	(4)	(139)	(6)
Other short-term borrowings		(97)	(4)	(183)	(8)
Federal Home Loan Bank borrowings		(606)	0	(910)	0
Long-term debt		(157)	(124)	(296)	(232)
Securities lending expense		(28)	(8)	(50)	(15)
Other interest expense		1	2	(1)	3
Interest expense		(1,814)	(166)	(3,060)	(302)
Net interest revenue		2,290	2,544	5,060	4,727
Total net revenues		4,656	5,093	9,772	9,765
Asset management and administration fees [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers	[1]	1,173	1,052	2,291	2,120
Asset Management and administration fees, Mutual funds, ETFs, and CTFs [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers		630	515	1,215	1,004
Asset Management and administration fees, Advice solutions [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers		464	461	917	957
Asset Management and administration fees, Other [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers		79	76	159	159
Trading revenue [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers		803	885	1,695	1,848
Trading revenue, Commissions [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers		394	443	816	927
Trading revenue, Order Flow Revenue [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers		365	430	779	900
Trading revenue, Principal Transactions [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers		44	12	100	21
Bank deposit account fees [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers		175	352	326	646
Other [Member]
Disaggregation of Revenue [Line Items]
Revenues from contracts with customers		$ 215	$ 260	$ 400	$ 424

[1] No fee waivers were recognized for the three and six months ended June 30, 2023. Includes fee waivers of $3 million and $57 million for the three and six months ended June 30, 2022, respectively.