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Allowance for Credit Losses - Rollforward of Allowance for Credit Losses (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2023
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Beginning balance | $ 773 |  |  |  |
Charge-offs | (46) | $ (22) |  |  |
Ending balance | 787 | 715 |  |  |
Loans and leases | 61,753 |  |  |  | $ 61,292
Accounting Standards Update [Extensible List] |  |  | Accounting Standards Update 2023-02 | Accounting Standards Update 2022-02 |
Funded And Unfunded Loan Commitments |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Ending balance | 866 | 800 |  |  |
Funded commitment |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Beginning balance | 773 | 685 |  |  |
Charge-offs | (46) | (22) |  |  |
Recoveries | 6 | 6 |  |  |
Provision for loan and lease losses | 54 | 52 |  |  |
Ending balance |  |  | $ 685 |  |
Accounting Standards Update [Extensible List] |  |  | Accounting Standards Update 2022-02 |  |
Funded commitment | Accounting Standards Update 2022-02 |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Beginning balance |  | (6) |  |  |
Ending balance |  |  | $ (6) |  |
Unfunded commitment |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Beginning balance | 83 | 87 |  |  |
Provision for loan and lease losses | (4) | (2) |  |  |
Ending balance | 79 | 85 | 87 |  |
Commercial: | Commercial, financial and industrial |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Charge-offs | (28) | (14) |  |  |
Ending balance | 348 | 325 |  |  |
Loans and leases | 32,911 |  |  |  | 32,633
Commercial: | Commercial, financial and industrial | Paycheck Protection Plan |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Loans and leases | 23 | 53 |  |  | 29
Commercial: | Commercial, financial and industrial | Funded And Unfunded Loan Commitments |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Ending balance | 397 | 378 |  |  |
Commercial: | Commercial, financial and industrial | Funded commitment |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Beginning balance | 339 | 308 |  |  |
Charge-offs | (28) | (14) |  |  |
Recoveries | 3 | 3 |  |  |
Provision for loan and lease losses | 34 | 27 |  |  |
Ending balance |  |  | 308 |  |
Commercial: | Commercial, financial and industrial | Funded commitment | Accounting Standards Update 2022-02 |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Beginning balance |  | 1 |  |  |
Ending balance |  |  | 1 |  |
Commercial: | Commercial, financial and industrial | Unfunded commitment |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Beginning balance | 49 | 55 |  |  |
Provision for loan and lease losses | 0 | (2) |  |  |
Ending balance | 49 | 53 | 55 |  |
Commercial: | Commercial Real Estate |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Charge-offs | (12) | (2) |  |  |
Ending balance | 181 | 150 |  |  |
Loans and leases | 14,426 |  |  |  | 14,216
Commercial: | Commercial Real Estate | Funded And Unfunded Loan Commitments |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Ending balance | 199 | 171 |  |  |
Commercial: | Commercial Real Estate | Funded commitment |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Beginning balance | 172 | 146 |  |  |
Charge-offs | (12) | (2) |  |  |
Recoveries | 0 | 0 |  |  |
Provision for loan and lease losses | 21 | 6 |  |  |
Ending balance |  |  | 146 |  |
Commercial: | Commercial Real Estate | Funded commitment | Accounting Standards Update 2022-02 |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Beginning balance |  | 0 |  |  |
Ending balance |  |  | 0 |  |
Commercial: | Commercial Real Estate | Unfunded commitment |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Beginning balance | 22 | 22 |  |  |
Provision for loan and lease losses | (4) | (1) |  |  |
Ending balance | 18 | 21 | 22 |  |
Commercial: | Credit Card and Other |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Loans and leases | 181 |  |  |  | 180
Consumer: |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Loans and leases | 13,645 |  |  |  | 13,650
Consumer: | Consumer Real Estate |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Charge-offs | 0 | (1) |  |  |
Ending balance | 231 | 209 |  |  |
Loans and leases | 13,645 |  |  |  | 13,650
Consumer: | Consumer Real Estate | Funded And Unfunded Loan Commitments |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Ending balance | 243 | 220 |  |  |
Consumer: | Consumer Real Estate | Funded commitment |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Beginning balance | 233 | 200 |  |  |
Charge-offs | 0 | (1) |  |  |
Recoveries | 1 | 2 |  |  |
Provision for loan and lease losses | (3) | 15 |  |  |
Ending balance |  |  | 200 |  |
Consumer: | Consumer Real Estate | Funded commitment | Accounting Standards Update 2022-02 |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Beginning balance |  | (7) |  |  |
Ending balance |  |  | (7) |  |
Consumer: | Consumer Real Estate | Unfunded commitment |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Beginning balance | 12 | 10 |  |  |
Provision for loan and lease losses | 0 | 1 |  |  |
Ending balance | 12 | 11 | 10 |  |
Consumer: | Credit Card and Other |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Charge-offs | (6) | (5) |  |  |
Ending balance | 27 | 31 |  |  |
Loans and leases | 771 |  |  |  | $ 793
Consumer: | Credit Card and Other | Funded And Unfunded Loan Commitments |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Ending balance | 27 | 31 |  |  |
Consumer: | Credit Card and Other | Funded commitment |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Beginning balance | 29 | 31 |  |  |
Charge-offs | (6) | (5) |  |  |
Recoveries | 2 | 1 |  |  |
Provision for loan and lease losses | 2 | 4 |  |  |
Ending balance |  |  | 31 |  |
Consumer: | Credit Card and Other | Funded commitment | Accounting Standards Update 2022-02 |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Beginning balance |  | 0 |  |  |
Ending balance |  |  | 0 |  |
Consumer: | Credit Card and Other | Unfunded commitment |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Beginning balance | 0 | 0 |  |  |
Provision for loan and lease losses | 0 | 0 |  |  |
Ending balance | $ 0 | $ 0 | $ 0 |  |

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