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FAIR VALUE MEASUREMENTS - Fair Value Hierarchy Levels of Assets by Pricing Source, Securities Carried at Amortized Cost (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities, held-to-maturity, fair value | $ 18,245 | $ 19,657
Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities, held-to-maturity, fair value | 17,319 | 18,662
Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities, held-to-maturity, fair value | 926 | 995
Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities, held-to-maturity, fair value | 0 | 0
Government and agencies |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities, held-to-maturity, fair value | 17,474 | 18,829
Government and agencies | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities, held-to-maturity, fair value | 17,319 | 18,662
Government and agencies | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities, held-to-maturity, fair value | 155 | 167
Government and agencies | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities, held-to-maturity, fair value | 0 | 0
Government and agencies | Third party pricing vendor |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities, held-to-maturity, fair value | 17,474 | 18,829
Government and agencies | Third party pricing vendor | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities, held-to-maturity, fair value | 17,319 | 18,662
Government and agencies | Third party pricing vendor | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities, held-to-maturity, fair value | 155 | 167
Government and agencies | Third party pricing vendor | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities, held-to-maturity, fair value | 0 | 0
Municipalities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities, held-to-maturity, fair value | 285 | 307
Municipalities | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities, held-to-maturity, fair value | 0 | 0
Municipalities | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities, held-to-maturity, fair value | 285 | 307
Municipalities | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities, held-to-maturity, fair value | 0 | 0
Municipalities | Third party pricing vendor |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities, held-to-maturity, fair value | 285 | 307
Municipalities | Third party pricing vendor | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities, held-to-maturity, fair value | 0 | 0
Municipalities | Third party pricing vendor | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities, held-to-maturity, fair value | 285 | 307
Municipalities | Third party pricing vendor | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities, held-to-maturity, fair value | 0 | 0
Public utilities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities, held-to-maturity, fair value | 36 | 38
Public utilities | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities, held-to-maturity, fair value | 0 | 0
Public utilities | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities, held-to-maturity, fair value | 36 | 38
Public utilities | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities, held-to-maturity, fair value | 0 | 0
Public utilities | Third party pricing vendor |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities, held-to-maturity, fair value | 36 | 38
Public utilities | Third party pricing vendor | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities, held-to-maturity, fair value | 0 | 0
Public utilities | Third party pricing vendor | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities, held-to-maturity, fair value | 36 | 38
Public utilities | Third party pricing vendor | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities, held-to-maturity, fair value | 0 | 0
Sovereign and supranational |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities, held-to-maturity, fair value | 431 | 462
Sovereign and supranational | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities, held-to-maturity, fair value | 0 | 0
Sovereign and supranational | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities, held-to-maturity, fair value | 431 | 462
Sovereign and supranational | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities, held-to-maturity, fair value | 0 | 0
Sovereign and supranational | Third party pricing vendor |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities, held-to-maturity, fair value | 213 | 226
Sovereign and supranational | Third party pricing vendor | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities, held-to-maturity, fair value | 0 | 0
Sovereign and supranational | Third party pricing vendor | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities, held-to-maturity, fair value | 213 | 226
Sovereign and supranational | Third party pricing vendor | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities, held-to-maturity, fair value | 0 | 0
Sovereign and supranational | Internal |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities, held-to-maturity, fair value | 218 | 236
Sovereign and supranational | Internal | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities, held-to-maturity, fair value | 0 | 0
Sovereign and supranational | Internal | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities, held-to-maturity, fair value | 218 | 236
Sovereign and supranational | Internal | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities, held-to-maturity, fair value | 0 | 0
Other corporate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities, held-to-maturity, fair value | 19 | 21
Other corporate | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities, held-to-maturity, fair value | 0 | 0
Other corporate | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities, held-to-maturity, fair value | 19 | 21
Other corporate | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities, held-to-maturity, fair value | 0 | 0
Other corporate | Third party pricing vendor |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities, held-to-maturity, fair value | 19 | 21
Other corporate | Third party pricing vendor | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities, held-to-maturity, fair value | 0 | 0
Other corporate | Third party pricing vendor | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities, held-to-maturity, fair value | 19 | 21
Other corporate | Third party pricing vendor | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities, held-to-maturity, fair value | $ 0 | $ 0

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