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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 | 6 Months Ended
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Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Derivative [Line Items] |  |  |  |
Derivative instruments not designated as hedging instruments gain (loss), net | $ (113) | $ (230) | $ (98) | $ (142)
Mortgage Banking | Interest Rate Contracts |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative instruments not designated as hedging instruments gain (loss), net | (45) | (184) | (168) | (77)
Customer Contracts |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative instruments not designated as hedging instruments gain (loss), net | 25 | 91 | 38 | 149
Customer Contracts | Interest Rate Contracts |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative instruments not designated as hedging instruments gain (loss), net | (21) | 33 | (37) | 35
Customer Contracts | Foreign exchange contracts and other |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative instruments not designated as hedging instruments gain (loss), net | 46 | 58 | 75 | 114
Other Risk Management Activity | Foreign exchange contracts and other |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative instruments not designated as hedging instruments gain (loss), net | $ (93) | $ (137) | $ 32 | $ (214)

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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://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4C Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name Accounting Standards Codification -Section 50 -Paragraph 4CC -SubTopic 10 -Topic 815 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4CC + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480237/815-40-50-5 + Details
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