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Asset Quality - Schedule of Performance of Loans That Have Been Modified in the Last 12 Months (Details) - USD ($) $ in Millions | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | --- | ---
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified in last 12 months | $ 595 | $ 534 | $ 295
Current |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified in last 12 months | 528 | 474 | 267
30-89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified in last 12 months | 50 | 24 | 27
90 and Greater Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified in last 12 months | 17 | 36 | 1
Total commercial loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified in last 12 months | 565 | 499 |
Total commercial loans | Current |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified in last 12 months | 500 | 443 |
Total commercial loans | 30-89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified in last 12 months | 49 | 22 |
Total commercial loans | 90 and Greater Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified in last 12 months | 16 | 34 |
Total commercial loans | Commercial and Industrial |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified in last 12 months | 304 | 163 | 263
Total commercial loans | Commercial and Industrial | Current |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified in last 12 months | 286 | 154 | 238
Total commercial loans | Commercial and Industrial | 30-89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified in last 12 months | 7 | 3 | 25
Total commercial loans | Commercial and Industrial | 90 and Greater Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified in last 12 months | 11 | 6 | 0
Total commercial loans | Total commercial real estate loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified in last 12 months | 261 | 336 | 269
Total commercial loans | Total commercial real estate loans | Current |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified in last 12 months | 214 | 289 | 244
Total commercial loans | Total commercial real estate loans | 30-89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified in last 12 months | 42 | 19 | 25
Total commercial loans | Total commercial real estate loans | 90 and Greater Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified in last 12 months | 5 | 28 | 0
Total commercial loans | Real estate — commercial mortgage |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified in last 12 months | 231 | 307 | 6
Total commercial loans | Real estate — commercial mortgage | Current |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified in last 12 months | 184 | 260 | 6
Total commercial loans | Real estate — commercial mortgage | 30-89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified in last 12 months | 42 | 19 | 0
Total commercial loans | Real estate — commercial mortgage | 90 and Greater Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified in last 12 months | 5 | 28 | 0
Total commercial loans | Real estate — construction |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified in last 12 months | 30 | 29 | 269
Total commercial loans | Real estate — construction | Current |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified in last 12 months | 30 | 29 | 244
Total commercial loans | Real estate — construction | 30-89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified in last 12 months | 0 | 0 | 25
Total commercial loans | Real estate — construction | 90 and Greater Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified in last 12 months | 0 | 0 | 0
Total commercial loans | Commercial lease financing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified in last 12 months | 0 |  |
Total commercial loans | Commercial lease financing | Current |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified in last 12 months | 0 |  |
Total commercial loans | Commercial lease financing | 30-89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified in last 12 months | 0 |  |
Total commercial loans | Commercial lease financing | 90 and Greater Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified in last 12 months | 0 |  |
Total consumer loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified in last 12 months | 30 | 35 | 26
Total consumer loans | Current |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified in last 12 months | 28 | 31 | 23
Total consumer loans | 30-89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified in last 12 months | 1 | 2 | 2
Total consumer loans | 90 and Greater Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified in last 12 months | 1 | 2 | 1
Total consumer loans | Real estate — residential mortgage |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified in last 12 months | 14 | 14 | 10
Total consumer loans | Real estate — residential mortgage | Current |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified in last 12 months | 12 | 12 | 9
Total consumer loans | Real estate — residential mortgage | 30-89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified in last 12 months | 1 | 1 | 1
Total consumer loans | Real estate — residential mortgage | 90 and Greater Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified in last 12 months | 1 | 1 | 0
Total consumer loans | Home equity loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified in last 12 months | 9 | 13 | 9
Total consumer loans | Home equity loans | Current |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified in last 12 months | 9 | 11 | 8
Total consumer loans | Home equity loans | 30-89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified in last 12 months | 0 | 1 | 0
Total consumer loans | Home equity loans | 90 and Greater Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified in last 12 months | 0 | 1 | 1
Total consumer loans | Other consumer loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified in last 12 months | 4 | 5 | 3
Total consumer loans | Other consumer loans | Current |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified in last 12 months | 4 | 5 | 3
Total consumer loans | Other consumer loans | 30-89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified in last 12 months | 0 | 0 | 0
Total consumer loans | Other consumer loans | 90 and Greater Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified in last 12 months | 0 | 0 | 0
Total consumer loans | Credit cards |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified in last 12 months | 3 | 3 | 4
Total consumer loans | Credit cards | Current |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified in last 12 months | 3 | 3 | 3
Total consumer loans | Credit cards | 30-89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified in last 12 months | 0 | 0 | 1
Total consumer loans | Credit cards | 90 and Greater Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Total loans modified in last 12 months | $ 0 | $ 0 | $ 0

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