Loans - Summary of Changes in Allowance for Credit Losses (Detail) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2026	Mar. 31, 2025
Allowance for loan losses
Beginning balance	$ 2,148	$ 4,666
Charge-offs	(23)	(417)
Recoveries	14	41
Net (charge-offs)/recoveries	(9)	(376)
Provision	253	270
Other	(47)	(52)
Ending balance	$ 2,345	$ 4,508
Allowance ratio	1.00%	2.20%
Net charge-off ratio	0.00%	0.80%
Allowance for losses on lending commitments
Beginning balance	$ 731	$ 674
Provision	62	32
Other	(1)	1
Ending balance	792	707
Wholesale
Allowance for loan losses
Beginning balance	2,148	2,099
Charge-offs	(23)	(60)
Recoveries	14	6
Net (charge-offs)/recoveries	(9)	(54)
Provision	253	67
Other	(47)	(52)
Ending balance	$ 2,345	$ 2,060
Allowance ratio	1.00%	1.10%
Net charge-off ratio	0.00%	0.10%
Allowance for losses on lending commitments
Beginning balance	$ 731	$ 674
Provision	62	32
Other	(1)	1
Ending balance	792	707
Consumer
Allowance for loan losses
Beginning balance	0	2,567
Charge-offs	0	(357)
Recoveries	0	35
Net (charge-offs)/recoveries	0	(322)
Provision	0	203
Other	0	0
Ending balance	$ 0	$ 2,448
Allowance ratio	0.00%	13.00%
Net charge-off ratio	0.00%	6.80%
Allowance for losses on lending commitments
Beginning balance	$ 0	$ 0
Provision	0	0
Other	0	0
Ending balance	$ 0	$ 0

Amount of other addition (reduction) in allowance reserve for debit loss.

No definition available.

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- Definition

Allowance for loan losses as a percentage of total gross loans receivable.

+ References

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Allowance for losses on lending commitments.

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- Definition

Annualized net charge-offs as a percentage of average total gross loans receivable.

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- Definition

Financing Receivable, Allowance for Credit Loss, Other

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount, after recovery, of writeoff of financing receivable, charged against allowance for credit loss.

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- Definition

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

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- Definition

Amount of increase in allowance for credit loss on financing receivable from recovery.

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- Definition

Amount of writeoff of financing receivable, charged against allowance for credit loss.

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- Definition

Amount, excluding accrued interest, of credit loss expense (reversal of expense) on financing receivable. Excludes net investment in lease.

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- Definition

Amount of expected credit loss for credit exposure on off-balance-sheet commitment, including but not limited to, loan commitment, standby letter of credit, financial guarantee not accounted for as insurance. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging.

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Amount of expense (reversal of expense) for expected credit loss for off-balance sheet credit exposure. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging.

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