Loans - Summary of Loans and Lending Commitments Accounted for at Amortized Cost by Portfolio (Detail) - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025
Loans Receivable [Line Items]
Forecasted period for allowance for credit losses	3 years
Carrying Value	$ 263,076	$ 239,882
Other commitments	605,878	497,119
Nonaccrual loans	3,486	3,387
Corporate
Loans Receivable [Line Items]
Carrying Value	35,564	30,676
Nonaccrual loans	1,784	2,065
Commercial real estate
Loans Receivable [Line Items]
Carrying Value	40,309	37,409
Nonaccrual loans	1,186	1,079
Residential real estate
Loans Receivable [Line Items]
Carrying Value	35,542	31,957
Nonaccrual loans	72	85
Securities-based
Loans Receivable [Line Items]
Carrying Value	19,110	18,079
Other collateralized
Loans Receivable [Line Items]
Carrying Value	108,991	98,999
Nonaccrual loans	424	121
Other
Loans Receivable [Line Items]
Carrying Value	4,054	3,020
Nonaccrual loans	20	37
Credit cards
Loans Receivable [Line Items]
Carrying Value	19,506	19,742
Wholesale and Consumer Portfolio Segment
Loans Receivable [Line Items]
Carrying Value	234,391	212,911
Wholesale and Consumer Portfolio Segment \| Amortized Cost
Loans Receivable [Line Items]
Other commitments	290,139	238,972
Wholesale
Loans Receivable [Line Items]
Nonaccrual loans	3,490	3,390
Nonaccrual loans, allowance for credit losses	985	975
Nonaccrual loans, not requiring a reserve	486	656
Wholesale \| Corporate
Loans Receivable [Line Items]
Carrying Value	33,663	29,432
Wholesale \| Corporate \| Amortized Cost
Loans Receivable [Line Items]
Other commitments	220,279	179,236
Wholesale \| Commercial real estate
Loans Receivable [Line Items]
Carrying Value	39,377	36,261
Wholesale \| Commercial real estate \| Amortized Cost
Loans Receivable [Line Items]
Other commitments	10,079	7,109
Wholesale \| Residential real estate
Loans Receivable [Line Items]
Carrying Value	32,438	28,700
Wholesale \| Residential real estate \| Amortized Cost
Loans Receivable [Line Items]
Other commitments	3,847	3,017
Wholesale \| Securities-based
Loans Receivable [Line Items]
Carrying Value	19,110	18,079
Wholesale \| Securities-based \| Amortized Cost
Loans Receivable [Line Items]
Other commitments	923	784
Wholesale \| Other collateralized
Loans Receivable [Line Items]
Carrying Value	105,809	97,519
Wholesale \| Other collateralized \| Amortized Cost
Loans Receivable [Line Items]
Other commitments	53,834	47,741
Wholesale \| Other
Loans Receivable [Line Items]
Carrying Value	3,994	2,920
Wholesale \| Other \| Amortized Cost
Loans Receivable [Line Items]
Other commitments	$ 1,177	$ 1,085

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