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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, 2023 | Dec. 31, 2022
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | $ 21,616 | $ 21,210
Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 20,517 | 20,132
Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 1,099 | 1,078
Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 0 | 0
Government and agencies |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 20,700 | 20,312
Government and agencies | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 20,517 | 20,132
Government and agencies | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 183 | 180
Government and agencies | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 0 | 0
Government and agencies | Third party pricing vendor valuation technique |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 20,700 | 20,312
Government and agencies | Third party pricing vendor valuation technique | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 20,517 | 20,132
Government and agencies | Third party pricing vendor valuation technique | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 183 | 180
Government and agencies | Third party pricing vendor valuation technique | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 0 | 0
Municipalities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 341 | 335
Municipalities | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 0 | 0
Municipalities | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 341 | 335
Municipalities | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 0 | 0
Municipalities | Third party pricing vendor valuation technique |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 341 | 335
Municipalities | Third party pricing vendor valuation technique | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 0 | 0
Municipalities | Third party pricing vendor valuation technique | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 341 | 335
Municipalities | Third party pricing vendor valuation technique | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 0 | 0
Public utilities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 42 | 41
Public utilities | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 0 | 0
Public utilities | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 42 | 41
Public utilities | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 0 | 0
Public utilities | Third party pricing vendor valuation technique |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 42 | 41
Public utilities | Third party pricing vendor valuation technique | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 0 | 0
Public utilities | Third party pricing vendor valuation technique | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 42 | 41
Public utilities | Third party pricing vendor valuation technique | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 0 | 0
Sovereign and supranational |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 510 | 500
Sovereign and supranational | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 0 | 0
Sovereign and supranational | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 510 | 500
Sovereign and supranational | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 0 | 0
Sovereign and supranational | Third party pricing vendor valuation technique |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 246 | 242
Sovereign and supranational | Third party pricing vendor valuation technique | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 0 | 0
Sovereign and supranational | Third party pricing vendor valuation technique | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 246 | 242
Sovereign and supranational | Third party pricing vendor valuation technique | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 0 | 0
Sovereign and supranational | Broker/other |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 264 | 258
Sovereign and supranational | Broker/other | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 0 | 0
Sovereign and supranational | Broker/other | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 264 | 258
Sovereign and supranational | Broker/other | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 0 | 0
Other corporate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 23 | 22
Other corporate | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 0 | 0
Other corporate | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 23 | 22
Other corporate | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 0 | 0
Other corporate | Third party pricing vendor valuation technique |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 23 | 22
Other corporate | Third party pricing vendor valuation technique | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 0 | 0
Other corporate | Third party pricing vendor valuation technique | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 23 | 22
Other corporate | Third party pricing vendor valuation technique | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | $ 0 | $ 0

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