Loans - Summary of Loans and Lending Commitments Accounted for at Amortized Cost by Portfolio (Detail) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Loans Receivable [Line Items]
Forecasted period for allowance for credit losses	3 years
Carrying Value	$ 226,887	$ 200,866
Other commitments	547,520	447,126
Nonaccrual loans	3,199	3,652
Corporate
Loans Receivable [Line Items]
Carrying Value	31,804	29,972
Nonaccrual loans	1,863	1,977
Commercial real estate
Loans Receivable [Line Items]
Carrying Value	33,952	29,789
Nonaccrual loans	1,095	800
Residential real estate
Loans Receivable [Line Items]
Carrying Value	30,147	25,969
Nonaccrual loans	90	104
Securities-based
Loans Receivable [Line Items]
Carrying Value	18,469	16,477
Nonaccrual loans	0	2
Other collateralized
Loans Receivable [Line Items]
Carrying Value	89,764	75,107
Nonaccrual loans	126	757
Other
Loans Receivable [Line Items]
Carrying Value	2,734	2,149
Nonaccrual loans	25	12
Credit cards
Loans Receivable [Line Items]
Carrying Value	20,017	21,403
Wholesale and Consumer Portfolio Segment
Loans Receivable [Line Items]
Carrying Value	218,887	191,881
Wholesale and Consumer Portfolio Segment \| Amortized Cost
Loans Receivable [Line Items]
Other commitments	302,646	262,604
Wholesale
Loans Receivable [Line Items]
Nonaccrual loans	3,200	3,650
Nonaccrual loans, allowance for credit losses	831	735
Nonaccrual loans, not requiring a reserve	636	585
Wholesale \| Corporate
Loans Receivable [Line Items]
Carrying Value	30,139	28,689
Wholesale \| Corporate \| Amortized Cost
Loans Receivable [Line Items]
Other commitments	178,529	156,562
Wholesale \| Commercial real estate
Loans Receivable [Line Items]
Carrying Value	32,805	28,899
Wholesale \| Commercial real estate \| Amortized Cost
Loans Receivable [Line Items]
Other commitments	7,151	4,969
Wholesale \| Residential real estate
Loans Receivable [Line Items]
Carrying Value	26,702	22,243
Wholesale \| Residential real estate \| Amortized Cost
Loans Receivable [Line Items]
Other commitments	2,451	1,742
Wholesale \| Securities-based
Loans Receivable [Line Items]
Carrying Value	18,469	16,477
Wholesale \| Securities-based \| Amortized Cost
Loans Receivable [Line Items]
Other commitments	766	1,542
Wholesale \| Other collateralized
Loans Receivable [Line Items]
Carrying Value	88,141	74,008
Wholesale \| Other collateralized \| Amortized Cost
Loans Receivable [Line Items]
Other commitments	42,435	33,136
Wholesale \| Other
Loans Receivable [Line Items]
Carrying Value	2,614	1,950
Wholesale \| Other \| Amortized Cost
Loans Receivable [Line Items]
Other commitments	1,127	872
Consumer \| Credit cards
Loans Receivable [Line Items]
Carrying Value	20,017	19,615
Consumer \| Credit cards \| Amortized Cost
Loans Receivable [Line Items]
Other commitments	$ 70,187	$ 63,781

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Amortized cost, before allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement and net investment in lease.

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