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Asset Quality - Schedule of Amortized Cost Basis of Modified Loans That Subsequently Defaulted (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financial receivable, modifications, subsequent default, recorded investment | $ 2 | $ 4 | $ 44 | $ 22
Interest Rate Reduction |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financial receivable, modifications, subsequent default, recorded investment | 0 | 0 | 0 | 0
Term Extension |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financial receivable, modifications, subsequent default, recorded investment | 2 | 1 | 41 | 20
Other |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financial receivable, modifications, subsequent default, recorded investment | 0 | 2 | 2 | 2
Combination |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financial receivable, modifications, subsequent default, recorded investment | 0 | 1 | 1 | 0
Commercial and Industrial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financial receivable, modifications, subsequent default, recorded investment |  |  |  | 3
Commercial and Industrial | Interest Rate Reduction |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financial receivable, modifications, subsequent default, recorded investment |  |  |  | 0
Commercial and Industrial | Term Extension |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financial receivable, modifications, subsequent default, recorded investment |  |  |  | 1
Commercial and Industrial | Other |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financial receivable, modifications, subsequent default, recorded investment |  |  |  | 2
Commercial and Industrial | Combination |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financial receivable, modifications, subsequent default, recorded investment |  |  |  | 0
Total commercial loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financial receivable, modifications, subsequent default, recorded investment | 2 | 3 | 43 | 22
Total commercial loans | Interest Rate Reduction |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financial receivable, modifications, subsequent default, recorded investment | 0 | 0 | 0 | 0
Total commercial loans | Term Extension |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financial receivable, modifications, subsequent default, recorded investment | 2 | 1 | 41 | 20
Total commercial loans | Other |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financial receivable, modifications, subsequent default, recorded investment | 0 | 2 | 2 | 2
Total commercial loans | Combination |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financial receivable, modifications, subsequent default, recorded investment | 0 | 0 | 0 | 0
Total commercial loans | Commercial and Industrial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financial receivable, modifications, subsequent default, recorded investment | 2 | 3 | 2 |
Total commercial loans | Commercial and Industrial | Interest Rate Reduction |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financial receivable, modifications, subsequent default, recorded investment | 0 | 0 | 0 |
Total commercial loans | Commercial and Industrial | Term Extension |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financial receivable, modifications, subsequent default, recorded investment | 2 | 1 | 2 |
Total commercial loans | Commercial and Industrial | Other |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financial receivable, modifications, subsequent default, recorded investment | 0 | 2 | 0 |
Total commercial loans | Commercial and Industrial | Combination |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financial receivable, modifications, subsequent default, recorded investment | $ 0 | 0 | 0 |
Total commercial loans | Commercial mortgage |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financial receivable, modifications, subsequent default, recorded investment |  |  | 41 |
Total commercial loans | Commercial mortgage | Interest Rate Reduction |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financial receivable, modifications, subsequent default, recorded investment |  |  | 0 |
Total commercial loans | Commercial mortgage | Term Extension |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financial receivable, modifications, subsequent default, recorded investment |  |  | 39 |
Total commercial loans | Commercial mortgage | Other |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financial receivable, modifications, subsequent default, recorded investment |  |  | 2 |
Total commercial loans | Commercial mortgage | Combination |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financial receivable, modifications, subsequent default, recorded investment |  |  | 0 |
Total consumer loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financial receivable, modifications, subsequent default, recorded investment |  | 1 | 1 |
Total consumer loans | Interest Rate Reduction |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financial receivable, modifications, subsequent default, recorded investment |  | 0 | 0 |
Total consumer loans | Term Extension |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financial receivable, modifications, subsequent default, recorded investment |  | 0 | 0 |
Total consumer loans | Other |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financial receivable, modifications, subsequent default, recorded investment |  | 0 | 0 |
Total consumer loans | Combination |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financial receivable, modifications, subsequent default, recorded investment |  | 1 | 1 |
Total consumer loans | Home equity loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financial receivable, modifications, subsequent default, recorded investment |  |  | 1 |
Total consumer loans | Home equity loans | Interest Rate Reduction |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financial receivable, modifications, subsequent default, recorded investment |  |  | 0 |
Total consumer loans | Home equity loans | Term Extension |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financial receivable, modifications, subsequent default, recorded investment |  |  | 0 |
Total consumer loans | Home equity loans | Other |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financial receivable, modifications, subsequent default, recorded investment |  |  | 0 |
Total consumer loans | Home equity loans | Combination |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financial receivable, modifications, subsequent default, recorded investment |  |  | $ 1 |
Total consumer loans | Credit cards |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financial receivable, modifications, subsequent default, recorded investment |  | 1 |  |
Total consumer loans | Credit cards | Interest Rate Reduction |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financial receivable, modifications, subsequent default, recorded investment |  | 0 |  |
Total consumer loans | Credit cards | Term Extension |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financial receivable, modifications, subsequent default, recorded investment |  | 0 |  |
Total consumer loans | Credit cards | Other |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financial receivable, modifications, subsequent default, recorded investment |  | 0 |  |
Total consumer loans | Credit cards | Combination |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financial receivable, modifications, subsequent default, recorded investment |  | $ 1 |  |
Total commercial real estate loans | Commercial mortgage |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financial receivable, modifications, subsequent default, recorded investment |  |  |  | 19
Total commercial real estate loans | Commercial mortgage | Interest Rate Reduction |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financial receivable, modifications, subsequent default, recorded investment |  |  |  | 0
Total commercial real estate loans | Commercial mortgage | Term Extension |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financial receivable, modifications, subsequent default, recorded investment |  |  |  | 19
Total commercial real estate loans | Commercial mortgage | Other |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financial receivable, modifications, subsequent default, recorded investment |  |  |  | 0
Total commercial real estate loans | Commercial mortgage | Combination |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financial receivable, modifications, subsequent default, recorded investment |  |  |  | 0
Total commercial real estate loans | Total commercial real estate loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financial receivable, modifications, subsequent default, recorded investment |  |  |  | 19
Total commercial real estate loans | Total commercial real estate loans | Interest Rate Reduction |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financial receivable, modifications, subsequent default, recorded investment |  |  |  | 0
Total commercial real estate loans | Total commercial real estate loans | Term Extension |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financial receivable, modifications, subsequent default, recorded investment |  |  |  | 19
Total commercial real estate loans | Total commercial real estate loans | Other |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financial receivable, modifications, subsequent default, recorded investment |  |  |  | 0
Total commercial real estate loans | Total commercial real estate loans | Combination |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financial receivable, modifications, subsequent default, recorded investment |  |  |  | $ 0

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