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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
--- | ---
Mar. 31, 2025 | Mar. 31, 2024
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Balance, beginning of period | $ 2,352 | [1] | $ 2,322
Losses charged off | (173) |  | (146)
Recoveries of losses previously charged off | 37 |  | 36
Provision for (benefit from) loan and lease losses | 168 |  | 106
Balance, end of period | 2,384 | [1] | 2,318
Other Consumer Loans, Point of Sale |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Losses charged off | (6) |  | (8)
Recoveries of losses previously charged off | 6 |  | 8
Commercial |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Balance, beginning of period | 1,154 |  | 1,130
Losses charged off | (67) |  | (40)
Recoveries of losses previously charged off | 3 |  | 5
Provision for (benefit from) loan and lease losses | 151 |  | 46
Balance, end of period | 1,241 |  | 1,141
Residential Mortgage |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Balance, beginning of period | 146 |  | 145
Losses charged off | 0 |  | 0
Recoveries of losses previously charged off | 0 |  | 0
Provision for (benefit from) loan and lease losses | (7) |  | (5)
Balance, end of period | 139 |  | 140
Consumer |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Balance, beginning of period | 1,052 |  | 1,047
Losses charged off | (106) |  | (106)
Recoveries of losses previously charged off | 34 |  | 31
Provision for (benefit from) loan and lease losses | 24 |  | 65
Balance, end of period | $ 1,004 |  | $ 1,037
[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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- 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 A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + 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 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 Reference 2: 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 + Details
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- Definition Amount, excluding accrued interest, of credit loss expense (reversal of expense) on financing receivable. 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 (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 + Details
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