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INVESTMENT SECURITIES - Narrative (Details) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2023 USD ($) position | Dec. 31, 2022 USD ($)
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Book value | $ 17,466 | $ 15,946
Fair value | $ 15,515 | $ 14,254
Maximum individual state general bond obligation as a percentage of total debt securities (percent) | 1.00% |
Securities in unrealized loss positions, number of positions | position | 1,790 |
Securities, number of positions | position | 2,070 |
Standard & Poor's, AA Rating |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Percentage of debt securities considered to be of investment-grade (percent) | 98.00% |
Dispositions | Gentiva Hospice |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Book value | $ 281 |
Fair value | $ 295 |

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