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Financial Derivatives (Gains (Losses) on Derivatives Not Designated As Hedging Instruments under GAAP) (Details) - Not Designated as Hedging Instrument - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Derivative [Line Items] |  |  |  |
Derivative instruments not designated as hedging instruments gain (loss), net | $ 134 | $ (42) | $ (146) | $ (140)
Mortgage Banking | Interest rate contracts |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative instruments not designated as hedging instruments gain (loss), net | 14 | 203 | 133 | 35
Customer Contracts |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative instruments not designated as hedging instruments gain (loss), net | 59 | 56 | 221 | 94
Customer Contracts | Interest rate contracts |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative instruments not designated as hedging instruments gain (loss), net | 12 | (21) | (3) | (58)
Customer Contracts | Foreign exchange contracts and other |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative instruments not designated as hedging instruments gain (loss), net | 47 | 77 | 224 | 152
Other Risk Management Activity | Foreign exchange contracts and other |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative instruments not designated as hedging instruments gain (loss), net | $ 61 | $ (301) | $ (500) | $ (269)

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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 182 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480401/815-10-55-182 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4CC -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4CC Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 21 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147476148/220-40-50-21 + Details
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