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Derivatives and Hedging Activities - Cumulative Basis Adjustments on Fair Value Hedges (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Fair Value | $ 33,923 | $ 27,556
Long-term debt | Interest rate |  |
Derivatives, Fair Value [Line Items] |  |
Carrying amount of hedged item | 7,094 | 8,182
Hedge accounting basis adjustment | 211 | 416
Securities available for sale | Interest rate |  |
Derivatives, Fair Value [Line Items] |  |
Carrying amount of hedged item | 3,880 | 2,080
Hedge accounting basis adjustment | 287 | 21
Fair Value | 5,000 | 2,500
Derivatives Not Designated as Hedging Instruments | Long-term debt | Interest rate |  |
Derivatives, Fair Value [Line Items] |  |
Hedge accounting basis adjustment | $ (8) | $ (8)

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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=121590274&loc=SL109999712-113959 + Details
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