Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Percentage of decrease in weighted average contractual interest rate of financing receivable modified for debtor experiencing financial difficulty.

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Period of increase in weighted average maturity of financing receivable modified for debtor experiencing financial difficulty, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Loans and Allowance for Credit Losses - Effects of Loan Modifications (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Payment Delay
Financing Receivable, Modified [Line Items]
Weighted-average payment deferral (less than)	$ 1	$ 1	$ 1	$ 1
Loans purchased from GNMA mortgage pools \| Interest Rate Reduction
Financing Receivable, Modified [Line Items]
Weighted-Average Interest Rate Reduction	0.40%	0.40%	0.40%	0.50%
Loans purchased from GNMA mortgage pools \| Term Extension
Financing Receivable, Modified [Line Items]
Weighted-Average Months of Term Extension	103 months	109 months	102 months	113 months
Commercial \| Commercial \| Interest Rate Reduction
Financing Receivable, Modified [Line Items]
Weighted-Average Interest Rate Reduction	8.70%	20.50%	10.10%	20.20%
Commercial \| Commercial \| Term Extension
Financing Receivable, Modified [Line Items]
Weighted-Average Months of Term Extension	9 months	9 months	11 months	9 months
Commercial \| Commercial real estate \| Interest Rate Reduction
Financing Receivable, Modified [Line Items]
Weighted-Average Interest Rate Reduction	4.00%	4.40%	3.30%	3.10%
Commercial \| Commercial real estate \| Term Extension
Financing Receivable, Modified [Line Items]
Weighted-Average Months of Term Extension	10 months	12 months	9 months	12 months
Consumer \| Residential mortgages \| Interest Rate Reduction
Financing Receivable, Modified [Line Items]
Weighted-Average Interest Rate Reduction	1.10%	1.10%	1.30%	0.90%
Consumer \| Residential mortgages \| Term Extension
Financing Receivable, Modified [Line Items]
Weighted-Average Months of Term Extension	79 months	92 months	88 months	88 months
Consumer \| Credit card \| Interest Rate Reduction
Financing Receivable, Modified [Line Items]
Weighted-Average Interest Rate Reduction	16.00%	16.20%	16.10%	16.30%
Consumer \| Other retail \| Interest Rate Reduction
Financing Receivable, Modified [Line Items]
Weighted-Average Interest Rate Reduction	7.30%	6.40%	5.80%	7.70%
Consumer \| Other retail \| Term Extension
Financing Receivable, Modified [Line Items]
Weighted-Average Months of Term Extension	4 months	5 months	8 months	5 months