Loans - Summary of Loans and Lending Commitments Accounted for at Amortized Cost by Portfolio (Detail) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Loans Receivable [Line Items]
Forecasted period for allowance for credit losses	3 years
Carrying Value	$ 255,194	$ 239,882
Other commitments	624,667	497,119
Nonaccrual loans	3,623	3,387
Corporate
Loans Receivable [Line Items]
Carrying Value	38,156	30,676
Nonaccrual loans	1,955	2,065
Commercial real estate
Loans Receivable [Line Items]
Carrying Value	38,779	37,409
Nonaccrual loans	1,213	1,079
Residential real estate
Loans Receivable [Line Items]
Carrying Value	32,885	31,957
Nonaccrual loans	80	85
Securities-based
Loans Receivable [Line Items]
Carrying Value	18,592	18,079
Other collateralized
Loans Receivable [Line Items]
Carrying Value	104,592	98,999
Nonaccrual loans	349	121
Other
Loans Receivable [Line Items]
Carrying Value	3,135	3,020
Nonaccrual loans	26	37
Credit cards
Loans Receivable [Line Items]
Carrying Value	19,055	19,742
Wholesale and Consumer Portfolio Segment
Loans Receivable [Line Items]
Carrying Value	227,703	212,911
Wholesale and Consumer Portfolio Segment \| Amortized Cost
Loans Receivable [Line Items]
Other commitments	274,909	238,972
Wholesale
Loans Receivable [Line Items]
Nonaccrual loans	3,620	3,390
Nonaccrual loans, allowance for credit losses	1,080	975
Nonaccrual loans, not requiring a reserve	507	656
Wholesale \| Corporate
Loans Receivable [Line Items]
Carrying Value	36,685	29,432
Wholesale \| Corporate \| Amortized Cost
Loans Receivable [Line Items]
Other commitments	202,636	179,236
Wholesale \| Commercial real estate
Loans Receivable [Line Items]
Carrying Value	36,904	36,261
Wholesale \| Commercial real estate \| Amortized Cost
Loans Receivable [Line Items]
Other commitments	12,289	7,109
Wholesale \| Residential real estate
Loans Receivable [Line Items]
Carrying Value	29,819	28,700
Wholesale \| Residential real estate \| Amortized Cost
Loans Receivable [Line Items]
Other commitments	3,680	3,017
Wholesale \| Securities-based
Loans Receivable [Line Items]
Carrying Value	18,592	18,079
Wholesale \| Securities-based \| Amortized Cost
Loans Receivable [Line Items]
Other commitments	896	784
Wholesale \| Other collateralized
Loans Receivable [Line Items]
Carrying Value	102,653	97,519
Wholesale \| Other collateralized \| Amortized Cost
Loans Receivable [Line Items]
Other commitments	54,139	47,741
Wholesale \| Other
Loans Receivable [Line Items]
Carrying Value	3,050	2,920
Wholesale \| Other \| Amortized Cost
Loans Receivable [Line Items]
Other commitments	$ 1,269	$ 1,085

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