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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 | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities, held-to-maturity, fair value | $ 17,607 | $ 16,772
Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities, held-to-maturity, fair value | 16,711 | 15,916
Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity securities, held-to-maturity, fair value | 896 | 856
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 | 16,860 | 16,059
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 | 16,711 | 15,916
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 | 149 | 143
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 | 16,860 | 16,059
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 | 16,711 | 15,916
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 | 149 | 143
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 | 265 | 257
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 | 265 | 257
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 | 265 | 257
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 | 265 | 257
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 | 34 | 33
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 | 34 | 33
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 | 34 | 33
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 | 34 | 33
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 | 430 | 405
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 | 430 | 405
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 | 212 | 198
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 | 212 | 198
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 | 207
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 | 207
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 | 18 | 18
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 | 18 | 18
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 | 18 | 18
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 | 18 | 18
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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