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INVESTMENT SECURITIES - Narrative (Details) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2024 USD ($) position | Dec. 31, 2023 USD ($)
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Book value | $ 19,267 | $ 18,302
Fair value | $ 17,812 | 17,008
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 | 1,750 |
Securities, number of positions | position | 2,170 |
S&P AA- rating |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Percentage of debt securities considered to be of investment-grade (percent) | 97.00% |
Dispositions | Gentiva Hospice |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Book value | $ 379 | 379
Fair value | $ 396 | $ 398

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