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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 | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Derivative [Line Items] |  |  |
Total gains (losses) from derivatives not designated as hedging instruments | $ 820 | $ 507 | $ 415
Mortgage Banking | Interest Rate Contract |  |  |
Derivative [Line Items] |  |  |
Total gains (losses) from derivatives not designated as hedging instruments | 792 | 405 | (56)
Customer-related Contracts |  |  |
Derivative [Line Items] |  |  |
Total gains (losses) from derivatives not designated as hedging instruments | 366 | 239 | 203
Customer-related Contracts | Interest Rate Contract |  |  |
Derivative [Line Items] |  |  |
Total gains (losses) from derivatives not designated as hedging instruments | 210 | 125 | 99
Customer-related Contracts | Foreign Exchange And Other Contract |  |  |
Derivative [Line Items] |  |  |
Total gains (losses) from derivatives not designated as hedging instruments | 156 | 114 | 104
Other Risk Management Activity | Foreign Exchange And Other Contract |  |  |
Derivative [Line Items] |  |  |
Total gains (losses) from derivatives not designated as hedging instruments | $ (338) | $ (137) | $ 268

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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=121590274&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=121590274&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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