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Credit Quality and the Allowance for Loan and Lease Losses - Summary of Amortized Cost Basis of Modifications to Borrowers Experiencing Financial Difficulty (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025
Financing Receivable, Allowance for Credit Losses |  |  |  |
Financing receivable, excluding accrued interest, modified in period, amount | $ 737 | $ 377 | $ 1,100 | $ 526
Commercial |  |  |  |
Financing Receivable, Allowance for Credit Losses |  |  |  |
Financing receivable, excluding accrued interest, modified in period, amount | 720 | 333 | 1,009 | 455
Commercial | Level 3 |  |  |  |
Financing Receivable, Allowance for Credit Losses |  |  |  |
Amortized cost basis of the modifications to borrowers experiencing financial difficulty | 86 | 44 | 108 | 79
Commercial | Term Extension |  |  |  |
Financing Receivable, Allowance for Credit Losses |  |  |  |
Financing receivable, excluding accrued interest, modified in period, amount | 704 | 169 | 966 | 221
Commercial | Term Extension | Level 3 |  |  |  |
Financing Receivable, Allowance for Credit Losses |  |  |  |
Amortized cost basis of the modifications to borrowers experiencing financial difficulty | 28 | 1 | 50 | 1
Commercial | Payment Delay |  |  |  |
Financing Receivable, Allowance for Credit Losses |  |  |  |
Financing receivable, excluding accrued interest, modified in period, amount | 2 | 164 | 2 | 207
Commercial | Payment Delay | Level 3 |  |  |  |
Financing Receivable, Allowance for Credit Losses |  |  |  |
Amortized cost basis of the modifications to borrowers experiencing financial difficulty | 0 | 43 | 0 | 52
Commercial | Term Extension and Payment Delay | Level 3 |  |  |  |
Financing Receivable, Allowance for Credit Losses |  |  |  |
Amortized cost basis of the modifications to borrowers experiencing financial difficulty | 39 | 0 | 39 | 26
Commercial | Other | Level 3 |  |  |  |
Financing Receivable, Allowance for Credit Losses |  |  |  |
Amortized cost basis of the modifications to borrowers experiencing financial difficulty | 19 | 0 | 19 | 0
Commercial | Commercial and industrial loans |  |  |  |
Financing Receivable, Allowance for Credit Losses |  |  |  |
Financing receivable, excluding accrued interest, modified in period, amount | 525 | 243 | 775 | 283
Commercial | Commercial and industrial loans | Level 3 |  |  |  |
Financing Receivable, Allowance for Credit Losses |  |  |  |
Amortized cost basis of the modifications to borrowers experiencing financial difficulty | 55 | 44 | 77 | 56
Commercial | Commercial and industrial loans | Term Extension |  |  |  |
Financing Receivable, Allowance for Credit Losses |  |  |  |
Financing receivable, excluding accrued interest, modified in period, amount | 511 | 80 | 734 | 116
Commercial | Commercial and industrial loans | Term Extension | Level 3 |  |  |  |
Financing Receivable, Allowance for Credit Losses |  |  |  |
Amortized cost basis of the modifications to borrowers experiencing financial difficulty | 28 | 1 | 50 | 1
Commercial | Commercial and industrial loans | Payment Delay |  |  |  |
Financing Receivable, Allowance for Credit Losses |  |  |  |
Financing receivable, excluding accrued interest, modified in period, amount | 0 | 163 | 0 | 163
Commercial | Commercial and industrial loans | Payment Delay | Level 3 |  |  |  |
Financing Receivable, Allowance for Credit Losses |  |  |  |
Amortized cost basis of the modifications to borrowers experiencing financial difficulty | 0 | 43 | 0 | 52
Commercial | Commercial and industrial loans | Term Extension and Payment Delay | Level 3 |  |  |  |
Financing Receivable, Allowance for Credit Losses |  |  |  |
Amortized cost basis of the modifications to borrowers experiencing financial difficulty | 8 | 0 | 8 | 3
Commercial | Commercial and industrial loans | Other | Level 3 |  |  |  |
Financing Receivable, Allowance for Credit Losses |  |  |  |
Amortized cost basis of the modifications to borrowers experiencing financial difficulty | 19 | 0 | 19 | 0
Commercial | Commercial mortgage owner-occupied loans |  |  |  |
Financing Receivable, Allowance for Credit Losses |  |  |  |
Financing receivable, excluding accrued interest, modified in period, amount | 79 | 49 | 82 | 77
Commercial | Commercial mortgage owner-occupied loans | Level 3 |  |  |  |
Financing Receivable, Allowance for Credit Losses |  |  |  |
Amortized cost basis of the modifications to borrowers experiencing financial difficulty | 0 | 0 | 0 | 23
Commercial | Commercial mortgage owner-occupied loans | Term Extension |  |  |  |
Financing Receivable, Allowance for Credit Losses |  |  |  |
Financing receivable, excluding accrued interest, modified in period, amount | 77 | 48 | 80 | 53
Commercial | Commercial mortgage owner-occupied loans | Term Extension | Level 3 |  |  |  |
Financing Receivable, Allowance for Credit Losses |  |  |  |
Amortized cost basis of the modifications to borrowers experiencing financial difficulty | 0 | 0 | 0 | 0
Commercial | Commercial mortgage owner-occupied loans | Payment Delay |  |  |  |
Financing Receivable, Allowance for Credit Losses |  |  |  |
Financing receivable, excluding accrued interest, modified in period, amount | 2 | 1 | 2 | 1
Commercial | Commercial mortgage owner-occupied loans | Payment Delay | Level 3 |  |  |  |
Financing Receivable, Allowance for Credit Losses |  |  |  |
Amortized cost basis of the modifications to borrowers experiencing financial difficulty | 0 | 0 | 0 | 0
Commercial | Commercial mortgage owner-occupied loans | Term Extension and Payment Delay | Level 3 |  |  |  |
Financing Receivable, Allowance for Credit Losses |  |  |  |
Amortized cost basis of the modifications to borrowers experiencing financial difficulty | 0 | 0 | 0 | 23
Commercial | Commercial mortgage owner-occupied loans | Other | Level 3 |  |  |  |
Financing Receivable, Allowance for Credit Losses |  |  |  |
Amortized cost basis of the modifications to borrowers experiencing financial difficulty | 0 | 0 | 0 | 0
Commercial | Commercial construction loans |  |  |  |
Financing Receivable, Allowance for Credit Losses |  |  |  |
Financing receivable, excluding accrued interest, modified in period, amount | 33 | 41 | 67 | 93
Commercial | Commercial construction loans | Level 3 |  |  |  |
Financing Receivable, Allowance for Credit Losses |  |  |  |
Amortized cost basis of the modifications to borrowers experiencing financial difficulty | 31 | 0 | 31 | 0
Commercial | Commercial construction loans | Term Extension |  |  |  |
Financing Receivable, Allowance for Credit Losses |  |  |  |
Financing receivable, excluding accrued interest, modified in period, amount | 33 | 41 | 67 | 50
Commercial | Commercial construction loans | Term Extension | Level 3 |  |  |  |
Financing Receivable, Allowance for Credit Losses |  |  |  |
Amortized cost basis of the modifications to borrowers experiencing financial difficulty | 0 | 0 | 0 | 0
Commercial | Commercial construction loans | Payment Delay |  |  |  |
Financing Receivable, Allowance for Credit Losses |  |  |  |
Financing receivable, excluding accrued interest, modified in period, amount | 0 | 0 | 0 | 43
Commercial | Commercial construction loans | Payment Delay | Level 3 |  |  |  |
Financing Receivable, Allowance for Credit Losses |  |  |  |
Amortized cost basis of the modifications to borrowers experiencing financial difficulty | 0 | 0 | 0 | 0
Commercial | Commercial construction loans | Term Extension and Payment Delay | Level 3 |  |  |  |
Financing Receivable, Allowance for Credit Losses |  |  |  |
Amortized cost basis of the modifications to borrowers experiencing financial difficulty | 31 | 0 | 31 | 0
Commercial | Commercial construction loans | Other | Level 3 |  |  |  |
Financing Receivable, Allowance for Credit Losses |  |  |  |
Amortized cost basis of the modifications to borrowers experiencing financial difficulty | $ 0 | $ 0 | $ 0 | $ 0

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