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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
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Mar. 31, 2023 | Mar. 31, 2022
Derivative [Line Items] |  |
Derivative instruments not designated as hedging instruments gain (loss), net | $ 88 | $ (77)
Mortgage Banking | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Derivative instruments not designated as hedging instruments gain (loss), net | 107 | (265)
Customer Contracts |  |
Derivative [Line Items] |  |
Derivative instruments not designated as hedging instruments gain (loss), net | 58 | 141
Customer Contracts | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Derivative instruments not designated as hedging instruments gain (loss), net | 2 | 97
Customer Contracts | Foreign exchange contracts and other |  |
Derivative [Line Items] |  |
Derivative instruments not designated as hedging instruments gain (loss), net | 56 | 44
Other Risk Management Activity | Foreign exchange contracts and other |  |
Derivative [Line Items] |  |
Derivative instruments not designated as hedging instruments gain (loss), net | $ (77) | $ 47

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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/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4CC -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL109998890-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5624171-113959 + 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 No definition available. + Details
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