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SECURITIES - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items] |  |  |
Taxable interest income from investment securities | $ 642 | $ 672 | $ 625
Mortgage-backed securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Securitizations of mortgage loans | $ 150 | $ 142 | $ 134

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- Definition The cash inflow from securitizing loans held with the intention to resell in the near future. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3461-108585 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 16 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3337-108585 + Details
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