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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Loans and Allowance for Credit Losses - Effects of Loan Modifications (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
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	0.50%	0.70%	0.50%	0.70%
Loans purchased from GNMA mortgage pools \| Term Extension
Financing Receivable, Modified [Line Items]
Weighted-Average Months of Term Extension	119 months	87 months	116 months	79 months
Commercial \| Commercial \| Interest Rate Reduction
Financing Receivable, Modified [Line Items]
Weighted-Average Interest Rate Reduction	20.60%	21.30%	20.00%	3.30%
Commercial \| Commercial \| Term Extension
Financing Receivable, Modified [Line Items]
Weighted-Average Months of Term Extension	5 months	8 months	7 months	7 months
Commercial \| Commercial real estate \| Interest Rate Reduction
Financing Receivable, Modified [Line Items]
Weighted-Average Interest Rate Reduction	2.20%	0.00%	2.20%	0.00%
Commercial \| Commercial real estate \| Term Extension
Financing Receivable, Modified [Line Items]
Weighted-Average Months of Term Extension	8 months	10 months	9 months	10 months
Consumer \| Residential mortgages \| Interest Rate Reduction
Financing Receivable, Modified [Line Items]
Weighted-Average Interest Rate Reduction	0.50%	1.40%	0.70%	1.40%
Consumer \| Residential mortgages \| Term Extension
Financing Receivable, Modified [Line Items]
Weighted-Average Months of Term Extension	86 months	89 months	85 months	111 months
Consumer \| Credit card \| Interest Rate Reduction
Financing Receivable, Modified [Line Items]
Weighted-Average Interest Rate Reduction	16.30%	16.40%	16.30%	16.20%
Consumer \| Other retail \| Interest Rate Reduction
Financing Receivable, Modified [Line Items]
Weighted-Average Interest Rate Reduction	7.60%	8.60%	8.40%	7.30%
Consumer \| Other retail \| Term Extension
Financing Receivable, Modified [Line Items]
Weighted-Average Months of Term Extension	5 months	108 months	4 months	134 months