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Loans and Allowance for Credit Losses - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans pledged at the Federal Home Loan Bank | $ 374,960 |  | $ 374,960 |  | $ 372,249
Loans pledged at the Federal Reserve Bank | 89,600 |  | 89,600 |  | 85,100
Net unearned interest and deferred fees and costs on originated loans and unamortized premiums and discounts on purchased loans | $ 2,000 |  | $ 2,000 |  | 2,500
Reasonable and supportable period for allowance for credit loss | 3 years |  | 3 years |  |
Foreclosed residential real estate property included in other real estate owned | $ 23 |  | $ 23 |  | 21
Foreclosed residential real estate related to mortgage loans whose payments are insured by the Federal Housing Administration or guaranteed by the United States Department of Veterans Affairs | 63 |  | 63 |  | 46
Residential mortgage loans secured by residential real estate in process of foreclosure | 593 |  | 593 |  | 576
Modified loans | 1,244 | $ 1,540 | 3,349 | $ 3,661 |
Commitments to lend | $ 368 |  | 368 |  |
Trial Modifications |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Modified loans |  |  | $ 185 |  |
Credit card |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loan modification amortization period | 60 months |  | 60 months |  |
GNMA loans upon foreclosure |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Residential mortgage loans secured by residential real estate in process of foreclosure | $ 365 |  | $ 365 |  | 354
Commercial |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loan threshold when individually evaluated for allowance calculation | $ 5 |  | $ 5 |  |
Threshold period to be placed on nonaccrual status | 90 days |  | 90 days |  |
Consumer |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loan modification amortization period | 60 months |  | 60 months |  |
Consumer | Residential Mortgages and Other Retail Loans Secured by 1-4 Family Properties |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Threshold period for charge-off to fair value of collateral less costs to sell | 180 days |  | 180 days |  |
Consumer | Residential Mortgages Loans and Junior Liens Secured by 1-4 Family Properties |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Threshold period to be placed on nonaccrual status | 120 days |  | 120 days |  |
Consumer | First Lien |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Threshold period to be placed on nonaccrual status | 180 days |  | 180 days |  |
Consumer | Credit card |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Threshold period past due for charge-off | 180 days |  | 180 days |  |
Modified loans | $ 147 | $ 135 | $ 355 | $ 332 |
Consumer | Other Retail Loans not Secured by 1-4 Family Properties |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Threshold period past due for charge-off | 120 days |  | 120 days |  |
Consumer | Revolving Consumer Lines |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Threshold period past due for charge-off | 180 days |  | 180 days |  |
Federal Home Loan Bank |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans pledged at the Federal Home Loan Bank | $ 126,300 |  | $ 126,300 |  | $ 127,600

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