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Derivative and Hedging Activities - Effect of Derivative Instruments on Consolidated Statements of Income and Comprehensive Income (Details) - Interest Income - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Interest Rate Swap |  |  |  |
Derivative [Line Items] |  |  |  |
Interest income | $ (2) | $ (9) | $ 24 | $ (37)
Hedged Item - Loans |  |  |  |
Derivative [Line Items] |  |  |  |
Interest income | $ 2 | $ 9 | $ (24) | $ 37

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- Definition Amount after accretion (amortization) of discount (premium), and investment expense, of interest income and dividend income on nonoperating securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(a),(b)) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 + Details
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