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Financing Receivable, Nonaccrual, Allowance For Credit Loss

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Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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Amortized cost of financing receivable on nonaccrual status with no allowance for credit loss. Excludes net investment in lease.

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Amortized cost of financing receivable on nonaccrual status. Excludes net investment in lease.

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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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Loans - Summary of Loans and Lending Commitments Accounted for at Amortized Cost by Portfolio (Detail) - USD ($) $ in Millions	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021
Loans Receivable [Line Items]
Carrying Value	$ 183,152		$ 184,829
Lending Commitments	232,949		222,689
Nonaccrual loans	4,384		2,710
Nonaccrual loans, allowance for credit losses	4,895	$ 5,232	5,543	$ 4,846	$ 4,562	$ 3,573
Corporate
Loans Receivable [Line Items]
Carrying Value	36,815		40,135
Nonaccrual loans	1,614		1,432
Commercial real estate
Loans Receivable [Line Items]
Carrying Value	25,672		28,879
Nonaccrual loans	1,913		1,079
Residential real estate
Loans Receivable [Line Items]
Carrying Value	23,953		23,035
Nonaccrual loans	19		93
Securities-based
Loans Receivable [Line Items]
Carrying Value	15,053		16,671
Other collateralized
Loans Receivable [Line Items]
Carrying Value	55,646		51,702
Nonaccrual loans	814		65
Other
Loans Receivable [Line Items]
Carrying Value	1,753		2,261
Nonaccrual loans	20		0
Installment
Loans Receivable [Line Items]
Carrying Value	6,375		6,326
Nonaccrual loans	4		41
Credit cards
Loans Receivable [Line Items]
Carrying Value	17,885		15,820
Wholesale and Consumer Portfolio Segment
Loans Receivable [Line Items]
Carrying Value	167,214		172,580
Lending Commitments	232,949		222,689
Wholesale
Loans Receivable [Line Items]
Nonaccrual loans	4,380		2,670
Nonaccrual loans, allowance for credit losses	2,473	2,497	2,562	2,468	2,458	2,135
Nonaccrual loans, allowance for credit loss	708		535
Nonaccrual loans, not requiring a reserve	922		384
Wholesale \| Corporate
Loans Receivable [Line Items]
Carrying Value	34,191		36,822
Lending Commitments	142,270		137,149
Wholesale \| Commercial real estate
Loans Receivable [Line Items]
Carrying Value	24,382		26,222
Lending Commitments	3,286		3,692
Wholesale \| Residential real estate
Loans Receivable [Line Items]
Carrying Value	19,924		18,523
Lending Commitments	1,889		3,089
Wholesale \| Securities-based
Loans Receivable [Line Items]
Carrying Value	15,053		16,671
Lending Commitments	815		508
Wholesale \| Other collateralized
Loans Receivable [Line Items]
Carrying Value	54,175		50,473
Lending Commitments	15,411		13,209
Wholesale \| Other
Loans Receivable [Line Items]
Carrying Value	1,332		1,723
Lending Commitments	883		944
Consumer
Loans Receivable [Line Items]
Nonaccrual loans, allowance for credit losses	2,422	$ 2,735	2,981	$ 2,378	$ 2,104	$ 1,438
Consumer \| Installment
Loans Receivable [Line Items]
Carrying Value	272		6,326
Lending Commitments	1		1,882
Consumer \| Credit cards
Loans Receivable [Line Items]
Carrying Value	17,885		15,820
Lending Commitments	$ 68,394		$ 62,216