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Financial Derivatives (Impact of Fair Value Hedge Accounting on the Carrying Value of Hedged Items) (Details) - Fair Value Hedging [Member] - Designated as Hedging Instruments under GAAP [Member] - USD ($) $ in Millions | Jun. 30, 2020 | Dec. 31, 2019
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Investment Securities [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Carrying Value of the Hedged Items | $ 3,476 | $ 5,666
Cumulative Fair Value Hedge Adjustment included in the Carrying Value of Hedged Items | 124 | 59
Borrowed Funds [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Carrying Value of the Hedged Items | 29,156 | 28,616
Cumulative Fair Value Hedge Adjustment included in the Carrying Value of Hedged Items | 1,991 | 548
Borrowed Funds Discontinued Relationships [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Cumulative Fair Value Hedge Adjustment included in Carrying Value of Hedged Items | $ (200) | $ (300)

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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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- Definition Amount of cumulative increase (decrease) in fair value of hedged asset in fair value hedge, attributable to hedged risk, remaining after discontinued hedge. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4EE -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL109999712-113959 + Details
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- Definition Amount of asset hedged in fair value hedging relationship. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4EE -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL109999712-113959 + Details
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- Definition Amount of cumulative increase (decrease) in fair value of hedged asset in fair value hedge, attributable to hedged risk. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4EE -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL109999712-113959 + Details
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