Loans - Summary of Loans and Lending Commitments Accounted for at Amortized Cost by Portfolio (Detail) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Loans Receivable [Line Items]
Loans	$ 181,515	$ 162,135
Lending Commitments	216,644	197,120
Corporate
Loans Receivable [Line Items]
Loans	63,181	55,927
Wealth management
Loans Receivable [Line Items]
Loans	50,101	43,998
Commercial real estate
Loans Receivable [Line Items]
Loans	26,082	25,883
Residential real estate
Loans Receivable [Line Items]
Loans	14,342	15,913
Other
Loans Receivable [Line Items]
Loans	8,961	8,530
Installment
Loans Receivable [Line Items]
Loans	5,157	3,672
Credit cards
Loans Receivable [Line Items]
Loans	13,691	8,212
Increase in credit card lending commitments	15,000
Commitment to acquire loan portfolio		2,000
Credit card receivables issued to customers
Loans Receivable [Line Items]
Lending Commitments	60,660	33,970
Wholesale and Consumer Portfolio Segment
Loans Receivable [Line Items]
Loans	166,465	143,507
Lending Commitments	216,644	197,120
Wholesale
Loans Receivable [Line Items]
Nonaccrual loans, for which allowance for credit losses was measured	2,210	2,430
Nonaccrual loans, allowance for credit losses	449	543
Nonaccrual loans, for which no allowance for credit losses required	313	140
Wholesale \| Corporate
Loans Receivable [Line Items]
Loans	57,431	50,960
Lending Commitments	139,946	143,296
Wholesale \| Wealth management
Loans Receivable [Line Items]
Loans	45,564	38,062
Lending Commitments	4,638	4,091
Wholesale \| Commercial real estate
Loans Receivable [Line Items]
Loans	22,214	21,150
Lending Commitments	2,715	4,306
Wholesale \| Residential real estate
Loans Receivable [Line Items]
Loans	14,084	15,493
Lending Commitments	2,793	3,317
Wholesale \| Other
Loans Receivable [Line Items]
Loans	8,324	5,958
Lending Commitments	4,940	6,169
Consumer \| Installment
Loans Receivable [Line Items]
Loans	5,157	3,672
Lending Commitments	957	9
Consumer \| Credit cards
Loans Receivable [Line Items]
Loans	13,691	8,212
Lending Commitments	$ 60,655	$ 35,932

Amount of lending commitments held-for-investment.

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Increase in lending commitments due to acquisition of GM credit card portfolio.

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Amount of allowance for credit losses related to recorded investment.

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