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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Period of increase in weighted-average maturity of financing receivable modified for debtor experiencing financial difficulty, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents 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		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
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	0.70%	0.40%	0.60%	0.40%
Loans purchased from GNMA mortgage pools \| Term Extension
Financing Receivable, Modified [Line Items]
Weighted-Average Months of Term Extension	89 months	100 months	92 months	99 months
Commercial \| Commercial \| Interest Rate Reduction
Financing Receivable, Modified [Line Items]
Weighted-Average Interest Rate Reduction	0.00%	1.20%	0.00%	1.60%
Commercial \| Commercial \| Term Extension
Financing Receivable, Modified [Line Items]
Weighted-Average Months of Term Extension	10 months	14 months	35 months	12 months
Commercial \| Commercial real estate \| Interest Rate Reduction
Financing Receivable, Modified [Line Items]
Weighted-Average Interest Rate Reduction	4.00%	0.00%	4.00%	2.10%
Commercial \| Commercial real estate \| Term Extension
Financing Receivable, Modified [Line Items]
Weighted-Average Months of Term Extension	8 months	4 months	9 months	5 months
Consumer \| Residential mortgages \| Interest Rate Reduction
Financing Receivable, Modified [Line Items]
Weighted-Average Interest Rate Reduction	0.60%	1.30%	0.90%	1.40%
Consumer \| Residential mortgages \| Term Extension
Financing Receivable, Modified [Line Items]
Weighted-Average Months of Term Extension	45 months	95 months	69 months	94 months
Consumer \| Credit card \| Interest Rate Reduction
Financing Receivable, Modified [Line Items]
Weighted-Average Interest Rate Reduction	16.10%	16.60%	16.30%	16.70%
Consumer \| Other retail \| Interest Rate Reduction
Financing Receivable, Modified [Line Items]
Weighted-Average Interest Rate Reduction	6.10%	4.60%	7.40%	5.00%
Consumer \| Other retail \| Term Extension
Financing Receivable, Modified [Line Items]
Weighted-Average Months of Term Extension	6 months	12 months	6 months	19 months