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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 | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | $ 20,085 | $ 26,869
Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 19,053 | 25,469
Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Held to maturity, fixed maturity securities, fair value | 1,032 | 1,400
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 | 19,225 | 25,699
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 | 19,053 | 25,469
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 | 172 | 230
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 | 19,225 | 25,699
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 | 19,053 | 25,469
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 | 172 | 230
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 | 321 | 436
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 | 321 | 436
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 | 321 | 436
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 | 321 | 436
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 | 41 | 55
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 | 41 | 55
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 | 41 | 55
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 | 41 | 55
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 | 477 | 650
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 | 477 | 650
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 | 232 | 313
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 | 232 | 313
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 | 245 | 337
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 | 245 | 337
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 | 21 | 29
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 | 21 | 29
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 | 21 | 29
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 | 21 | 29
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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