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INVESTMENT SECURITIES - Narrative (Details) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2022 USD ($) position | Dec. 31, 2021 USD ($)
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Book value | $ 15,392 | $ 13,440
Debt securities: | $ 13,487 | $ 13,497
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 | 1,655 |
Securities, number of positions | position | 1,905 |
Dispositions | Kindred at Home, Hospice and Personal Care Divisions |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Book value | $ 279 |
Debt securities: | $ 274 |
S&P AA- rating |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Percentage of debt securities considered to be of investment-grade (percent) | 95.00% |

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