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Financial Derivatives (Impact of Fair Value Hedge Accounting on the Carrying Value of Hedged Items) (Details) - Designated as Hedging Instrument - Fair Value Hedging - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Investment Securities |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Carrying Value of the Hedged Items | $ 2,785 | $ 5,666
Cumulative fair value hedge adjustment included in the carrying value of hedged items | 30 | 59
Borrowings |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Carrying Value of the Hedged Items | 25,797 | 28,616
Cumulative fair value hedge adjustment included in the carrying value of hedged items | 1,611 | 548
Borrowed Funds Discontinued Relationships |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Fair value hedge adjustments primarily related to discontinued borrowed funds hedge relationships, cumulative increase (decrease) | $ (100) | $ (300)

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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=121590274&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=121590274&loc=SL109999712-113959 + Details
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