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BENEFITS PAYABLE - Incurred and Paid Claims Development (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
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Claims Development [Line Items] |  |  |
Incurred Claims, Net of Reinsurance | $ 234,259 |  |
Cumulative Paid Claims, Net of Reinsurance | 224,018 |  |
Benefits payable, net of reinsurance | 10,241 |  |
2021 and Prior Claims Incurred Year |  |  |
Claims Development [Line Items] |  |  |
Incurred Claims, Net of Reinsurance | 69,484 | $ 69,698 | $ 70,066
Cumulative Paid Claims, Net of Reinsurance | 69,484 | 69,252 | $ 62,149
2022 Claims Incurred Year |  |  |
Claims Development [Line Items] |  |  |
Incurred Claims, Net of Reinsurance | 75,447 | 76,105 |
Cumulative Paid Claims, Net of Reinsurance | 74,989 | $ 67,287 |
2023 Claims Incurred Year |  |  |
Claims Development [Line Items] |  |  |
Incurred Claims, Net of Reinsurance | 89,328 |  |
Cumulative Paid Claims, Net of Reinsurance | $ 79,545 |  |

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- Definition Amount, after reinsurance, of paid claims and allocated claim adjustment expense used in claims development for short-duration insurance contracts. Excludes unallocated claim adjustment expense. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 4B -Subparagraph (b) -SubTopic 40 -Topic 944 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-4B + Details
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