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Credit Quality and the Allowance for Loan and Lease Losses - Summary of the ALLL and Related Loans and Leases Classified by Portfolio Segment (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Jun. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | --- | --- | --- | --- | ---
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |
Individually evaluated | $ 170 |  |  | $ 117 |  |  |  |
Collectively evaluated | 2,095 |  |  | 2,235 |  |  |  |
Total ALLL | 2,265 | [1] | $ 2,412 | 2,352 | [1] | $ 2,305 | $ 2,288 | $ 2,322
Individually evaluated | 622 |  |  | 622 |  |  |  |
Collectively evaluated | 122,401 |  |  | 119,061 |  |  |  |
Total portfolio loans and leases | 123,023 |  |  | 119,683 |  |  |  |
Leveraged leases | 242 |  |  | 248 |  |  |  |
Commercial Leveraged Leases |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |
Total ALLL | 2 |  |  | 1 |  |  |  |
Commercial |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |
Individually evaluated | 156 |  |  | 106 |  |  |  |
Collectively evaluated | 1,026 |  |  | 1,048 |  |  |  |
Total ALLL | 1,182 |  | 1,293 | 1,154 |  | 1,105 | 1,113 | 1,130
Individually evaluated | 380 |  |  | 395 |  |  |  |
Collectively evaluated | 74,043 |  |  | 72,898 |  |  |  |
Total portfolio loans and leases | 74,423 |  |  | 73,293 |  |  |  |
Residential Mortgage |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |
Individually evaluated | 0 |  |  | 0 |  |  |  |
Collectively evaluated | 133 |  |  | 146 |  |  |  |
Total ALLL | 133 |  | 134 | 146 |  | 143 | 136 | 145
Individually evaluated | 137 |  |  | 131 |  |  |  |
Collectively evaluated | 17,400 |  |  | 17,304 |  |  |  |
Total portfolio loans and leases | 17,537 |  |  | 17,435 |  |  |  |
Residential mortgage loans | 107 |  |  | 108 |  | 114 |  |
Consumer |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |
Individually evaluated | 14 |  |  | 11 |  |  |  |
Collectively evaluated | 936 |  |  | 1,041 |  |  |  |
Total ALLL | 950 |  | $ 985 | 1,052 |  | $ 1,057 | $ 1,039 | $ 1,047
Individually evaluated | 105 |  |  | 96 |  |  |  |
Collectively evaluated | 30,958 |  |  | 28,859 |  |  |  |
Total portfolio loans and leases | $ 31,063 |  |  | $ 28,955 |  |  |  |
[1] | Includes $42 and $51 of other short-term investments, $649 and $1,000 of portfolio loans and leases, $(11) and $(19) of ALLL, $4 and $5 of other assets, $11 and $12 of other liabilities and $563 and $889 of long-term debt from consolidated VIEs that are included in their respective captions above at September 30, 2025 and December 31, 2024, respectively. For further information, refer to Note 7.

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