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Credit Quality and the Allowance for Loan and Lease Losses - Summary of Transactions in the ALLL by Portfolio Segment (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |
Balance, beginning of period | $ 2,412 |  | $ 2,288 | $ 2,352 | [1] | $ 2,322
Losses charged off | (382) |  | (183) | (748) |  | (511)
Recoveries of losses previously charged off | 43 |  | 41 | 134 |  | 115
Provision for (benefit from) loan and lease losses | 192 |  | 159 | 527 |  | 379
Balance, end of period | 2,265 | [1] | 2,305 | 2,265 | [1] | 2,305
Other Consumer Loans, Point of Sale |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |
Losses charged off | (4) |  | (6) | (15) |  | (22)
Recoveries of losses previously charged off | 4 |  | 6 | 15 |  | 22
Commercial |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |
Balance, beginning of period | 1,293 |  | 1,113 | 1,154 |  | 1,130
Losses charged off | (282) |  | (80) | (439) |  | (203)
Recoveries of losses previously charged off | 7 |  | 8 | 28 |  | 16
Provision for (benefit from) loan and lease losses | 164 |  | 64 | 439 |  | 162
Balance, end of period | 1,182 |  | 1,105 | 1,182 |  | 1,105
Residential Mortgage |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |
Balance, beginning of period | 134 |  | 136 | 146 |  | 145
Losses charged off | 0 |  | 0 | (1) |  | (2)
Recoveries of losses previously charged off | 1 |  | 1 | 3 |  | 3
Provision for (benefit from) loan and lease losses | (2) |  | 6 | (15) |  | (3)
Balance, end of period | 133 |  | 143 | 133 |  | 143
Consumer |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |
Balance, beginning of period | 985 |  | 1,039 | 1,052 |  | 1,047
Losses charged off | (100) |  | (103) | (308) |  | (306)
Recoveries of losses previously charged off | 35 |  | 32 | 103 |  | 96
Provision for (benefit from) loan and lease losses | 30 |  | 89 | 103 |  | 220
Balance, end of period | $ 950 |  | $ 1,057 | $ 950 |  | $ 1,057
[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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- Definition Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479344/326-20-45-1 + Details
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- Definition Amount, excluding accrued interest, of increase in allowance for credit loss on financing receivable from recovery. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 + Details
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- Definition Amount, excluding accrued interest, of decrease in allowance for credit loss on financing receivable from writeoff. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 + Details
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