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Financial Derivatives (Gains (Losses) on Derivatives Not Designated As Hedging Instruments under GAAP) (Details) - Not Designated as Hedging Instrument [Member] - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Derivative [Line Items] |  |  |  |
Derivative Instruments Not Designated As Hedging Instruments Gain Loss Net | $ 90 | $ 279 | $ 964 | $ 374
Mortgage Banking [Member] | Interest Rate Contracts [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Instruments Not Designated As Hedging Instruments Gain Loss Net | 125 | 218 | 779 | 346
Customer Contracts [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Instruments Not Designated As Hedging Instruments Gain Loss Net | 67 | 71 | 80 | 92
Customer Contracts [Member] | Interest Rate Contracts [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Instruments Not Designated As Hedging Instruments Gain Loss Net | 38 | 41 | 40 | 39
Customer Contracts [Member] | Foreign Exchange And Other Contract [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Instruments Not Designated As Hedging Instruments Gain Loss Net | 29 | 30 | 40 | 53
Other Risk Management Activity [Member] | Foreign Exchange And Other Contract [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Instruments Not Designated As Hedging Instruments Gain Loss Net | $ (102) | $ (10) | $ 105 | $ (64)

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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=109980867&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=109980867&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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- Details
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