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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, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Derivative [Line Items] |  |  |  |
Derivative instruments not designated as hedging instruments gain (loss), net | $ 127 | $ (47) | $ 125 | $ 28
Mortgage Banking | Interest Rate Contracts |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative instruments not designated as hedging instruments gain (loss), net | (245) | 6 | (700) | (100)
Customer Contracts |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative instruments not designated as hedging instruments gain (loss), net | 63 | 19 | 253 | 181
Customer Contracts | Interest Rate Contracts |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative instruments not designated as hedging instruments gain (loss), net | 65 | (4) | 231 | 93
Customer Contracts | Foreign exchange contracts and other |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative instruments not designated as hedging instruments gain (loss), net | (2) | 23 | 22 | 88
Other Risk Management Activity | Foreign exchange contracts and other |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative instruments not designated as hedging instruments gain (loss), net | $ 309 | $ (72) | $ 572 | $ (53)

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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 http://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 http://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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