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Allowance for Credit Losses - Rollforward of Allowance for Credit Losses (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023 | Dec. 31, 2022
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |
Beginning balance | $ 787 | $ 715 | $ 773 |  |  |
Charge-offs | (49) | (33) | (95) | $ (54) |  |
Recoveries | 15 | 10 |  |  |  |
Provision for credit losses | 55 | 50 | 105 | 100 |  |
Ending balance | 821 | 737 | 821 | 737 | $ 773 |
Accounting Standards Update [Extensible List] |  |  |  |  | Accounting Standards Update 2023-02 | Accounting Standards Update 2022-02
Loans and leases | 62,781 |  | 62,781 |  | $ 61,292 |
Funded And Unfunded Loan Commitments |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |
Ending balance | 887 | 827 | 887 | 827 |  |
Funded commitment |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |
Beginning balance |  |  | 773 | 685 | 685 |
Charge-offs |  |  | (95) | (54) |  |
Recoveries |  |  | 21 | 15 |  |
Provision for credit losses | 68 | 45 | 122 | 97 |  |
Ending balance |  |  |  |  | 773 | $ 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) | (6) |
Ending balance |  |  |  |  |  | $ (6)
Unfunded commitment |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |
Beginning balance | 79 | 85 | 83 | 87 | 87 |
Provision for credit losses | (13) | 5 | (17) | 3 |  |
Ending balance | 66 | 90 | 66 | 90 | 83 | 87
Commercial: | Commercial, financial and industrial |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |
Beginning balance | 348 | 325 |  |  |  |
Charge-offs | (24) | (19) | (52) | (33) |  |
Recoveries | 12 | 5 |  |  |  |
Ending balance | 344 | 326 | 344 | 326 |  |
Loans and leases | 33,452 |  | 33,452 |  | 32,633 |
Commercial: | Commercial, financial and industrial | Paycheck Protection Plan |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |
Loans and leases | 19 | 44 | 19 | 44 | 29 |
Commercial: | Commercial, financial and industrial | Funded And Unfunded Loan Commitments |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |
Ending balance | 388 | 381 | 388 | 381 |  |
Commercial: | Commercial, financial and industrial | Funded commitment |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |
Beginning balance |  |  | 339 | 308 | 308 |
Charge-offs |  |  | (52) | (33) |  |
Recoveries |  |  | 14 | 7 |  |
Provision for credit losses | 8 | 15 | 43 | 43 |  |
Ending balance |  |  |  |  | 339 | 308
Commercial: | Commercial, financial and industrial | Funded commitment | Accounting Standards Update 2022-02 |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |
Beginning balance |  |  |  | 1 | 1 |
Ending balance |  |  |  |  |  | 1
Commercial: | Commercial, financial and industrial | Unfunded commitment |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |
Beginning balance | 49 | 53 | 49 | 55 | 55 |
Provision for credit losses | (5) | 2 | (5) | 0 |  |
Ending balance | 44 | 55 | 44 | 55 | 49 | 55
Commercial: | Commercial Real Estate |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |
Beginning balance | 181 | 150 |  |  |  |
Charge-offs | (19) | (8) | (32) | (10) |  |
Recoveries | 0 | 1 |  |  |  |
Ending balance | 221 | 159 | 221 | 159 |  |
Loans and leases | 14,669 |  | 14,669 |  | 14,216 |
Commercial: | Commercial Real Estate | Funded And Unfunded Loan Commitments |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |
Ending balance | 231 | 183 | 231 | 183 |  |
Commercial: | Commercial Real Estate | Funded commitment |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |
Beginning balance |  |  | 172 | 146 | 146 |
Charge-offs |  |  | (32) | (10) |  |
Recoveries |  |  | 0 | 1 |  |
Provision for credit losses | 59 | 16 | 81 | 22 |  |
Ending balance |  |  |  |  | 172 | 146
Commercial: | Commercial Real Estate | Funded commitment | Accounting Standards Update 2022-02 |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |
Beginning balance |  |  |  | 0 | 0 |
Ending balance |  |  |  |  |  | 0
Commercial: | Commercial Real Estate | Unfunded commitment |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |
Beginning balance | 18 | 21 | 22 | 22 | 22 |
Provision for credit losses | (8) | 3 | (12) | 2 |  |
Ending balance | 10 | 24 | 10 | 24 | 22 | 22
Commercial: | Credit Card and Other |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |
Loans and leases | 190 |  | 190 |  | 180 |
Consumer: |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |
Loans and leases | 13,909 |  | 13,909 |  | 13,650 |
Consumer: | Consumer Real Estate |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |
Beginning balance | 231 | 209 |  |  |  |
Charge-offs | (1) | (1) | (1) | (1) |  |
Recoveries | 2 | 3 |  |  |  |
Ending balance | 231 | 221 | 231 | 221 |  |
Loans and leases | 13,909 |  | 13,909 |  | 13,650 |
Consumer: | Consumer Real Estate | Funded And Unfunded Loan Commitments |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |
Ending balance | 243 | 232 | 243 | 232 |  |
Consumer: | Consumer Real Estate | Funded commitment |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |
Beginning balance |  |  | 233 | 200 | 200 |
Charge-offs |  |  | (1) | (1) |  |
Recoveries |  |  | 4 | 5 |  |
Provision for credit losses | (1) | 10 | (5) | 24 |  |
Ending balance |  |  |  |  | 233 | 200
Consumer: | Consumer Real Estate | Funded commitment | Accounting Standards Update 2022-02 |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |
Beginning balance |  |  |  | (7) | (7) |
Ending balance |  |  |  |  |  | (7)
Consumer: | Consumer Real Estate | Unfunded commitment |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |
Beginning balance | 12 | 11 | 12 | 10 | 10 |
Provision for credit losses | 0 | 0 | 0 | 1 |  |
Ending balance | 12 | 11 | 12 | 11 | 12 | 10
Consumer: | Credit Card and Other |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |
Beginning balance | 27 | 31 |  |  |  |
Charge-offs | (5) | (5) | (10) | (10) |  |
Recoveries | 1 | 1 |  |  |  |
Ending balance | 25 | 31 | 25 | 31 |  |
Loans and leases | 751 |  | 751 |  | 793 |
Consumer: | Credit Card and Other | Funded And Unfunded Loan Commitments |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |
Ending balance | 25 | 31 | 25 | 31 |  |
Consumer: | Credit Card and Other | Funded commitment |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |
Beginning balance |  |  | 29 | 31 | 31 |
Charge-offs |  |  | (10) | (10) |  |
Recoveries |  |  | 3 | 2 |  |
Provision for credit losses | 2 | 4 | 3 | 8 |  |
Ending balance |  |  |  |  | 29 | 31
Consumer: | Credit Card and Other | Funded commitment | Accounting Standards Update 2022-02 |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |
Beginning balance |  |  |  | 0 | 0 |
Ending balance |  |  |  |  |  | 0
Consumer: | Credit Card and Other | Unfunded commitment |  |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |  |
Beginning balance | 0 | 0 | 0 | 0 | 0 |
Provision for credit losses | 0 | 0 | 0 | 0 |  |
Ending balance | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0

X
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