Loans and Allowance for Credit Losses - Effects of Loan Modifications (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2024	Mar. 31, 2023
Payment Delay
Financing Receivable, Modified [Line Items]
Weighted-average payment deferral (less than)	$ 1	$ 1
Loans purchased from GNMA mortgage pools \| Interest Rate Reduction
Financing Receivable, Modified [Line Items]
Weighted-Average Interest Rate Reduction	0.40%	0.70%
Loans purchased from GNMA mortgage pools \| Term Extension
Financing Receivable, Modified [Line Items]
Weighted-Average Months of Term Extension	114 months	66 months
Commercial \| Commercial \| Interest Rate Reduction
Financing Receivable, Modified [Line Items]
Weighted-Average Interest Rate Reduction	19.30%	2.40%
Commercial \| Commercial \| Term Extension
Financing Receivable, Modified [Line Items]
Weighted-Average Months of Term Extension	7 months	5 months
Commercial \| Commercial real estate \| Interest Rate Reduction
Financing Receivable, Modified [Line Items]
Weighted-Average Interest Rate Reduction	4.30%	5.00%
Commercial \| Commercial real estate \| Term Extension
Financing Receivable, Modified [Line Items]
Weighted-Average Months of Term Extension	9 months	6 months
Consumer \| Residential mortgages \| Interest Rate Reduction
Financing Receivable, Modified [Line Items]
Weighted-Average Interest Rate Reduction	2.50%	1.20%
Consumer \| Residential mortgages \| Term Extension
Financing Receivable, Modified [Line Items]
Weighted-Average Months of Term Extension	84 months	120 months
Consumer \| Credit card \| Interest Rate Reduction
Financing Receivable, Modified [Line Items]
Weighted-Average Interest Rate Reduction	16.40%	16.00%
Consumer \| Other retail \| Interest Rate Reduction
Financing Receivable, Modified [Line Items]
Weighted-Average Interest Rate Reduction	9.30%	6.60%
Consumer \| Other retail \| Term Extension
Financing Receivable, Modified [Line Items]
Weighted-Average Months of Term Extension	4 months	151 months

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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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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