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Allowance for Credit Losses - Schedule of Rollforward of Allowance for Credit Losses (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Beginning balance | $ 685 | $ 670 | $ 963
Charge-offs | (199) | (93) | (59)
Recoveries | 29 | 34 | 57
Ending balance | 773 | $ 685 | 670
Accounting Standards Update [Extensible List] |  | Accounting Standards Update 2022-02 |
Loans and leases | 61,292 | $ 58,102 |
Accounting Standards Update 2022-02 |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Beginning balance | (6) |  |
Ending balance |  | (6) |
Funded and Unfunded Loan Commitments |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Beginning balance | 772 | 736 |
Ending balance | 856 | 772 | 736
Funded Commitments |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Provision for loan and lease losses | 264 | 74 | (291)
Unfunded Commitment |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Beginning balance | 87 | 66 | 85
Provision for loan and lease losses | (4) | 21 | (19)
Ending balance | 83 | 87 | 66
Commercial | C&I |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Beginning balance | 308 | 334 | 453
Charge-offs | (156) | (62) | (34)
Recoveries | 14 | 9 | 21
Ending balance | 339 | 308 | 334
Loans and leases | 32,633 | 31,781 |
Commercial | C&I | Single Company |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Charge-offs | (72) |  |
Commercial | C&I | Paycheck Protection Plan |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Loans and leases | 29 | 76 | 1,000
Commercial | C&I | Accounting Standards Update 2022-02 |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Beginning balance | 1 |  |
Ending balance |  | 1 |
Commercial | C&I | Funded and Unfunded Loan Commitments |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Beginning balance | 363 | 380 |
Ending balance | 388 | 363 | 380
Commercial | C&I | Funded Commitments |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Provision for loan and lease losses | 172 | 27 | (106)
Commercial | C&I | Unfunded Commitment |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Beginning balance | 55 | 46 | 65
Provision for loan and lease losses | (6) | 9 | (19)
Ending balance | 49 | 55 | 46
Commercial | Commercial Real Estate |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Beginning balance | 146 | 154 | 242
Charge-offs | (17) | (1) | (5)
Recoveries | 2 | 1 | 5
Ending balance | 172 | 146 | 154
Loans and leases | 14,216 | 13,228 |
Commercial | Commercial Real Estate | Accounting Standards Update 2022-02 |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Beginning balance | 0 |  |
Ending balance |  | 0 |
Commercial | Commercial Real Estate | Funded and Unfunded Loan Commitments |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Beginning balance | 168 | 166 |
Ending balance | 194 | 168 | 166
Commercial | Commercial Real Estate | Funded Commitments |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Provision for loan and lease losses | 41 | (8) | (88)
Commercial | Commercial Real Estate | Unfunded Commitment |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Beginning balance | 22 | 12 | 10
Provision for loan and lease losses | 0 | 10 | 2
Ending balance | 22 | 22 | 12
Commercial | Credit card and other |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Loans and leases | 180 | 193 |
Consumer |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Loans and leases | 13,650 | 12,253 |
Consumer | Consumer real estate |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Beginning balance | 200 | 163 | 242
Charge-offs | (4) | (5) | (5)
Recoveries | 9 | 19 | 27
Ending balance | 233 | 200 | 163
Loans and leases | 13,650 | 12,253 |
Consumer | Consumer real estate | Accounting Standards Update 2022-02 |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Beginning balance | (7) |  |
Ending balance |  | (7) |
Consumer | Consumer real estate | Funded and Unfunded Loan Commitments |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Beginning balance | 210 | 171 |
Ending balance | 245 | 210 | 171
Consumer | Consumer real estate | Funded Commitments |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Provision for loan and lease losses | 35 | 23 | (101)
Consumer | Consumer real estate | Unfunded Commitment |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Beginning balance | 10 | 8 | 10
Provision for loan and lease losses | 2 | 2 | (2)
Ending balance | 12 | 10 | 8
Consumer | Credit card and other |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Beginning balance | 31 | 19 | 26
Charge-offs | (22) | (25) | (15)
Recoveries | 4 | 5 | 4
Ending balance | 29 | 31 | 19
Loans and leases | 793 | 840 |
Consumer | Credit card and other | Accounting Standards Update 2022-02 |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Beginning balance | 0 |  |
Ending balance |  | 0 |
Consumer | Credit card and other | Funded and Unfunded Loan Commitments |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Beginning balance | 31 | 19 |
Ending balance | 29 | 31 | 19
Consumer | Credit card and other | Funded Commitments |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Provision for loan and lease losses | 16 | 32 | 4
Consumer | Credit card and other | Unfunded Commitment |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |
Beginning balance | 0 | 0 | 0
Provision for loan and lease losses | 0 | 0 | 0
Ending balance | $ 0 | $ 0 | $ 0

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