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Financial Derivatives (Hedged Items- Fair Value Hedges) (Details) - Designated as Hedging Instrument - Fair Value Hedging - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Investment Securities |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Carrying Value of the Hedged Items | $ 2,376 | $ 2,655
Cumulative fair value hedge adjustment included in the carrying value of hedged items | (121) | 23
Borrowed Funds |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Carrying Value of the Hedged Items | 21,781 | 24,259
Cumulative fair value hedge adjustment included in the carrying value of hedged items | (1,283) | 663
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) | $ (100)

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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 https://asc.fasb.org/extlink&oid=125515794&loc=SL109999712-113959 + Details
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