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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, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Derivative [Line Items] |  |  |  |
Derivative instruments not designated as hedging instruments gain (loss), net | $ (230) | $ 75 | $ (142) | $ (2)
Mortgage Banking | Interest Rate Contracts |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative instruments not designated as hedging instruments gain (loss), net | (184) | (190) | (77) | (455)
Customer Contracts |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative instruments not designated as hedging instruments gain (loss), net | 91 | 49 | 149 | 190
Customer Contracts | Interest Rate Contracts |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative instruments not designated as hedging instruments gain (loss), net | 33 | 69 | 35 | 166
Customer Contracts | Foreign exchange contracts and other |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative instruments not designated as hedging instruments gain (loss), net | 58 | (20) | 114 | 24
Other Risk Management Activity | Foreign exchange contracts and other |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative instruments not designated as hedging instruments gain (loss), net | $ (137) | $ 216 | $ (214) | $ 263

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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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