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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 | Mar. 31, 2025 | Dec. 31, 2024 | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | --- | --- | ---
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Individually evaluated | $ 192 |  | $ 117 |  |  |
Collectively evaluated | 2,192 |  | 2,235 |  |  |
Total ALLL | 2,384 | [1] | 2,352 | [1] | $ 2,318 | $ 2,322
Individually evaluated | 800 |  | 622 |  |  |
Collectively evaluated | 121,282 |  | 119,061 |  |  |
Total portfolio loans and leases | 122,082 |  | 119,683 |  |  |
Leveraged leases | 241 |  | 248 |  |  |
Commercial Leveraged Leases |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Total ALLL | 1 |  | 1 |  |  |
Commercial |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Individually evaluated | 178 |  | 106 |  |  |
Collectively evaluated | 1,063 |  | 1,048 |  |  |
Total ALLL | 1,241 |  | 1,154 |  | 1,141 | 1,130
Individually evaluated | 563 |  | 395 |  |  |
Collectively evaluated | 74,574 |  | 72,898 |  |  |
Total portfolio loans and leases | 75,137 |  | 73,293 |  |  |
Residential Mortgage |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Individually evaluated | 1 |  | 0 |  |  |
Collectively evaluated | 138 |  | 146 |  |  |
Total ALLL | 139 |  | 146 |  | 140 | 145
Individually evaluated | 136 |  | 131 |  |  |
Collectively evaluated | 17,336 |  | 17,304 |  |  |
Total portfolio loans and leases | 17,472 |  | 17,435 |  |  |
Residential mortgage loans | 109 |  | 108 |  | 113 |
Consumer |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Individually evaluated | 13 |  | 11 |  |  |
Collectively evaluated | 991 |  | 1,041 |  |  |
Total ALLL | 1,004 |  | 1,052 |  | $ 1,037 | $ 1,047
Individually evaluated | 101 |  | 96 |  |  |
Collectively evaluated | 29,372 |  | 28,859 |  |  |
Total portfolio loans and leases | $ 29,473 |  | $ 28,955 |  |  |
[1] | Includes $47 and $51 of other short-term investments, $874 and $1,000 of portfolio loans and leases, $(16) and $(19) of ALLL, $6 and $5 of other assets, $12 and $12 of other liabilities and $774 and $889 of long-term debt from consolidated VIEs that are included in their respective captions above at March 31, 2025 and December 31, 2024, respectively. For further information, refer to Note 7.

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