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Loans and Related Allowance for Credit Losses (Modified, Amortized Cost Basis) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified | $ 829 | $ 904 | $ 2,686 | $ 1,946
% of Loan Class | 0.26% | 0.28% | 0.84% | 0.61%
Unfunded lending related commitments | $ 500 | $ 300 | $ 500 | $ 300
Interest Rate Reduction |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified |  | 16 | 27 | 16
Term Extension |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified | 626 | 664 | 1,858 | 1,452
Payment Delay |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified | 137 | 105 | 212 | 196
Repayment Plan |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified | 22 | 21 | 58 | 53
Payment Delay and Term Extension |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified | 6 | 7 | 304 | 20
Interest Rate Reduction and Term Extension |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified | 12 |  | 107 | 3
Interest Rate Reduction and Payment Delay |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified |  |  | 15 |
Other |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified | 26 | 91 | 105 | 206
Commercial and industrial | Interest Rate Reduction |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified | 11 | 15 | 146 | 15
Commercial and industrial | Term Extension |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified | 389 | 363 | 1,188 | 724
Commercial and industrial | Payment Delay |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified | 25 | 44 | 206 | 111
Commercial real estate | Term Extension |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified | 253 | 307 | 1,073 | 745
Commercial real estate | Payment Delay |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified | 87 | 16 | 248 | 16
Residential real estate | Interest Rate Reduction |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified | 1 | 1 | 3 | 4
Residential real estate | Term Extension |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified | 1 |  | 4 | 3
Residential real estate | Payment Delay |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified | 28 | 50 | 67 | 83
Home equity | Payment Delay |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified | 3 | 2 | 10 | 6
Education | Term Extension |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified | 1 | 1 | 4 | 3
Total commercial |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified | $ 764 | $ 821 | $ 2,523 | $ 1,782
% of Loan Class | 0.35% | 0.38% | 1.14% | 0.82%
Total commercial | Interest Rate Reduction |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified |  | $ 15 | $ 27 | $ 15
Total commercial | Term Extension |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified | $ 625 | 663 | 1,853 | 1,449
Total commercial | Payment Delay |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified | 106 | 53 | 135 | 107
Total commercial | Payment Delay and Term Extension |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified | 6 | 7 | 304 | 20
Total commercial | Interest Rate Reduction and Term Extension |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified | 11 |  | 104 |
Total commercial | Interest Rate Reduction and Payment Delay |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified |  |  | 15 |
Total commercial | Other |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified | 16 | 83 | 85 | 191
Total commercial | Commercial and industrial |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified | $ 410 | $ 498 | $ 1,349 | $ 960
% of Loan Class | 0.23% | 0.29% | 0.75% | 0.55%
Total commercial | Commercial and industrial | Interest Rate Reduction |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified |  | $ 15 | $ 27 | $ 15
Total commercial | Commercial and industrial | Term Extension |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified | $ 372 | 356 | 927 | 704
Total commercial | Commercial and industrial | Payment Delay |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified | 19 | 37 | 34 | 91
Total commercial | Commercial and industrial | Payment Delay and Term Extension |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified | 6 | 7 | 157 | 20
Total commercial | Commercial and industrial | Interest Rate Reduction and Term Extension |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified | 11 |  | 104 |
Total commercial | Commercial and industrial | Interest Rate Reduction and Payment Delay |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified |  |  | 15 |
Total commercial | Commercial and industrial | Other |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified | 2 | 83 | 85 | 130
Total commercial | Commercial real estate |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified | $ 354 | $ 323 | $ 1,174 | $ 822
% of Loan Class | 1.01% | 0.90% | 3.34% | 2.30%
Total commercial | Commercial real estate | Term Extension |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified | $ 253 | $ 307 | $ 926 | $ 745
Total commercial | Commercial real estate | Payment Delay |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified | 87 | 16 | 101 | 16
Total commercial | Commercial real estate | Payment Delay and Term Extension |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified |  |  | 147 |
Total commercial | Commercial real estate | Other |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified | 14 |  |  | 61
Total consumer |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified | $ 65 | $ 83 | $ 163 | $ 164
% of Loan Class | 0.06% | 0.08% | 0.16% | 0.16%
Total consumer | Interest Rate Reduction |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified |  | $ 1 |  | $ 1
Total consumer | Term Extension |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified | $ 1 | 1 | $ 5 | 3
Total consumer | Payment Delay |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified | 31 | 52 | 77 | 89
Total consumer | Repayment Plan |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified | 22 | 21 | 58 | 53
Total consumer | Interest Rate Reduction and Term Extension |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified | 1 |  | 3 | 3
Total consumer | Other |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified | 10 | 8 | 20 | 15
Total consumer | Residential real estate |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified | $ 33 | $ 54 | $ 79 | $ 93
% of Loan Class | 0.07% | 0.11% | 0.17% | 0.20%
Total consumer | Residential real estate | Interest Rate Reduction |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified |  | $ 1 |  | $ 1
Total consumer | Residential real estate | Term Extension |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified |  |  | $ 1 |
Total consumer | Residential real estate | Payment Delay |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified | $ 28 | 50 | 67 | 83
Total consumer | Residential real estate | Interest Rate Reduction and Term Extension |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified | 1 |  | 3 | 3
Total consumer | Residential real estate | Other |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified | 4 | 3 | 8 | 6
Total consumer | Home equity |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified | $ 10 | $ 7 | $ 27 | $ 22
% of Loan Class | 0.04% | 0.03% | 0.10% | 0.08%
Total consumer | Home equity | Payment Delay |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified | $ 3 | $ 2 | $ 10 | $ 6
Total consumer | Home equity | Repayment Plan |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified | 1 |  | 5 | 7
Total consumer | Home equity | Other |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified | 6 | 5 | 12 | 9
Total consumer | Credit card |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified | $ 21 | $ 20 | $ 52 | $ 45
% of Loan Class | 0.31% | 0.28% | 0.76% | 0.64%
Total consumer | Credit card | Repayment Plan |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified | $ 21 | $ 20 | $ 52 | $ 45
Total consumer | Education |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified | $ 1 | $ 1 | $ 4 | $ 3
% of Loan Class | 0.06% | 0.05% | 0.24% | 0.15%
Total consumer | Education | Term Extension |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified | $ 1 | $ 1 | $ 4 | $ 3
Total consumer | Other consumer |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified |  | $ 1 | $ 1 | $ 1
% of Loan Class |  | 0.02% | 0.02% | 0.02%
Total consumer | Other consumer | Repayment Plan |  |  |  |
Financing Receivable [Line Items] |  |  |  |
Amortized cost basis, modified |  | $ 1 | $ 1 | $ 1

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