Fair Values of Assets and Liabilities - Fair Value of Other Financial Instruments (Details) - USD ($) $ in Millions		Sep. 30, 2023	Dec. 31, 2022
Assets
Held to maturity securities:	[1]	$ 162,452	$ 173,074
U.S. agency mortgage-backed securities
Assets
Held to maturity securities:		162,452	173,074
Carrying Amount
Assets
Cash and cash equivalents		20,507	26,140
Cash and investments segregated and on deposit for regulatory purposes		6,201	18,288
Receivables from brokerage clients — net		69,034	66,573
Held to maturity securities:		162,452	173,074
Bank loans – net		40,327	40,505
Other assets:		5,105	3,788
Liabilities
Bank deposits		284,408	366,724
Payables to brokerage clients		72,818	97,438
Accrued expenses and other liabilities		7,061	5,584
Other short-term borrowings		7,550	4,650
Federal Home Loan Bank borrowings		31,800	12,400
Long-term debt		24,758	20,760
Carrying Amount | Residential real estate | First Mortgages
Assets
Bank loans – net		26,009	25,132
Carrying Amount | Residential real estate | HELOCs
Assets
Bank loans – net		491	593
Carrying Amount | Pledged asset lines
Assets
Bank loans – net		13,538	14,592
Carrying Amount | Other
Assets
Bank loans – net		289	188
Carrying Amount | U.S. agency mortgage-backed securities
Assets
Held to maturity securities:		162,452	173,074
Portion at Other than Fair Value Measurement
Assets
Cash and cash equivalents		20,507	26,140
Cash and investments segregated and on deposit for regulatory purposes		6,201	18,288
Receivables from brokerage clients — net		69,034	66,573
Held to maturity securities:		143,003	158,936
Bank loans – net		36,792	37,638
Other assets:		5,105	3,788
Liabilities
Bank deposits		284,408	366,724
Payables to brokerage clients		72,818	97,438
Accrued expenses and other liabilities		7,061	5,584
Other short-term borrowings		7,550	4,650
Federal Home Loan Bank borrowings		31,800	12,400
Long-term debt		22,632	19,108
Portion at Other than Fair Value Measurement | Residential real estate | First Mortgages
Assets
Bank loans – net		22,420	22,201
Portion at Other than Fair Value Measurement | Residential real estate | HELOCs
Assets
Bank loans – net		545	657
Portion at Other than Fair Value Measurement | Pledged asset lines
Assets
Bank loans – net		13,538	14,592
Portion at Other than Fair Value Measurement | Other
Assets
Bank loans – net		289	188
Portion at Other than Fair Value Measurement | U.S. agency mortgage-backed securities
Assets
Held to maturity securities:		143,003	158,936
Portion at Other than Fair Value Measurement | Level 1
Assets
Cash and cash equivalents		20,507	26,140
Cash and investments segregated and on deposit for regulatory purposes		3,201	6,156
Receivables from brokerage clients — net		0	0
Held to maturity securities:		0	0
Bank loans – net		0	0
Other assets:		0	0
Liabilities
Bank deposits		0	0
Payables to brokerage clients		0	0
Accrued expenses and other liabilities		0	0
Other short-term borrowings		0	0
Federal Home Loan Bank borrowings		0	0
Long-term debt		0	0
Portion at Other than Fair Value Measurement | Level 1 | Residential real estate | First Mortgages
Assets
Bank loans – net		0	0
Portion at Other than Fair Value Measurement | Level 1 | Residential real estate | HELOCs
Assets
Bank loans – net		0	0
Portion at Other than Fair Value Measurement | Level 1 | Pledged asset lines
Assets
Bank loans – net		0	0
Portion at Other than Fair Value Measurement | Level 1 | Other
Assets
Bank loans – net		0	0
Portion at Other than Fair Value Measurement | Level 1 | U.S. agency mortgage-backed securities
Assets
Held to maturity securities:		0	0
Portion at Other than Fair Value Measurement | Level 2
Assets
Cash and cash equivalents		0	0
Cash and investments segregated and on deposit for regulatory purposes		3,000	12,132
Receivables from brokerage clients — net		69,034	66,573
Held to maturity securities:		143,003	158,936
Bank loans – net		36,792	37,638
Other assets:		5,105	3,788
Liabilities
Bank deposits		284,408	366,724
Payables to brokerage clients		72,818	97,438
Accrued expenses and other liabilities		7,061	5,584
Other short-term borrowings		7,550	4,650
Federal Home Loan Bank borrowings		31,800	12,400
Long-term debt		22,632	19,108
Portion at Other than Fair Value Measurement | Level 2 | Residential real estate | First Mortgages
Assets
Bank loans – net		22,420	22,201
Portion at Other than Fair Value Measurement | Level 2 | Residential real estate | HELOCs
Assets
Bank loans – net		545	657
Portion at Other than Fair Value Measurement | Level 2 | Pledged asset lines
Assets
Bank loans – net		13,538	14,592
Portion at Other than Fair Value Measurement | Level 2 | Other
Assets
Bank loans – net		289	188
Portion at Other than Fair Value Measurement | Level 2 | U.S. agency mortgage-backed securities
Assets
Held to maturity securities:		143,003	158,936
Portion at Other than Fair Value Measurement | Level 3
Assets
Cash and cash equivalents		0	0
Cash and investments segregated and on deposit for regulatory purposes		0	0
Receivables from brokerage clients — net		0	0
Held to maturity securities:		0	0
Bank loans – net		0	0
Other assets:		0	0
Liabilities
Bank deposits		0	0
Payables to brokerage clients		0	0
Accrued expenses and other liabilities		0	0
Other short-term borrowings		0	0
Federal Home Loan Bank borrowings		0	0
Long-term debt		0	0
Portion at Other than Fair Value Measurement | Level 3 | Residential real estate | First Mortgages
Assets
Bank loans – net		0	0
Portion at Other than Fair Value Measurement | Level 3 | Residential real estate | HELOCs
Assets
Bank loans – net		0	0
Portion at Other than Fair Value Measurement | Level 3 | Pledged asset lines
Assets
Bank loans – net		0	0
Portion at Other than Fair Value Measurement | Level 3 | Other
Assets
Bank loans – net		0	0
Portion at Other than Fair Value Measurement | Level 3 | U.S. agency mortgage-backed securities
Assets
Held to maturity securities:		$ 0	$ 0

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