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FAIR VALUE MEASUREMENTS - Fair Value Hierarchy Levels of Assets and Liabilities Carried at Cost or Amortized Cost (Details) - USD ($) $ in Millions | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Other investments | $ 5,491 |  | $ 4,070 |
Assets: |  |  |  |
Amortized Cost | 17,441 |  | 19,063 |
Held to maturity, fixed maturity securities, fair value | 19,938 |  | 21,210 |
Commercial mortgage and other loans | 13,346 |  |  |
Commercial mortgage and other loans, fair value | 13,014 |  | 13,212 |
Other investments carried at amortized cost | 32 | [1] | 34 | [2]
Other investments carried at amortized cost, fair value | 32 | [1] | 34 | [2]
Total financial instruments assets not carried at fair value | 30,814 |  | 32,586 |
Assets fair value disclosure financial instruments carried at cost | 32,984 |  | 34,456 |
Liabilities: |  |  |  |
Other policyholders’ funds | 6,115 |  | 6,643 |
Other policyholders' funds fair value disclosure | 6,020 |  | 6,543 |
Notes payable | 6,941 |  | 7,295 |
Notes payable, fair value disclosure | 6,622 |  | 6,826 |
Total financial instrument liabilities not carried at fair value | 13,056 |  | 13,938 |
Liabilities fair value disclosure financial instruments carried at cost | 12,642 |  | 13,369 |
Government and agencies |  |  |  |
Assets: |  |  |  |
Amortized Cost | 16,715 |  | 18,267 |
Held to maturity, fixed maturity securities, fair value | 19,102 |  | 20,312 |
Municipalities |  |  |  |
Assets: |  |  |  |
Amortized Cost | 261 |  | 287 |
Held to maturity, fixed maturity securities, fair value | 314 |  | 335 |
Public utilities |  |  |  |
Assets: |  |  |  |
Amortized Cost | 35 |  | 37 |
Held to maturity, fixed maturity securities, fair value | 39 |  | 41 |
Sovereign and supranational |  |  |  |
Assets: |  |  |  |
Amortized Cost | 408 |  | 446 |
Held to maturity, fixed maturity securities, fair value | 462 |  | 500 |
Other corporate |  |  |  |
Assets: |  |  |  |
Amortized Cost | 17 |  | 19 |
Held to maturity, fixed maturity securities, fair value | 21 |  | 22 |
Policy loans |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Other investments | 202 |  | 214 |
Equity method investments |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Other investments | 2,551 |  | 2,290 |
Level 1 |  |  |  |
Assets: |  |  |  |
Held to maturity, fixed maturity securities, fair value | 18,932 |  | 20,132 |
Commercial mortgage and other loans, fair value | 0 |  | 0 |
Other investments carried at amortized cost, fair value | 0 | [1] | 0 | [2]
Assets fair value disclosure financial instruments carried at cost | 18,932 |  | 20,132 |
Liabilities: |  |  |  |
Other policyholders' funds fair value disclosure | 0 |  | 0 |
Notes payable, fair value disclosure | 0 |  | 0 |
Liabilities fair value disclosure financial instruments carried at cost | 0 |  | 0 |
Level 1 | Government and agencies |  |  |  |
Assets: |  |  |  |
Held to maturity, fixed maturity securities, fair value | 18,932 |  | 20,132 |
Level 1 | Municipalities |  |  |  |
Assets: |  |  |  |
Held to maturity, fixed maturity securities, fair value | 0 |  | 0 |
Level 1 | Public utilities |  |  |  |
Assets: |  |  |  |
Held to maturity, fixed maturity securities, fair value | 0 |  | 0 |
Level 1 | Sovereign and supranational |  |  |  |
Assets: |  |  |  |
Held to maturity, fixed maturity securities, fair value | 0 |  | 0 |
Level 1 | Other corporate |  |  |  |
Assets: |  |  |  |
Held to maturity, fixed maturity securities, fair value | 0 |  | 0 |
Level 2 |  |  |  |
Assets: |  |  |  |
Held to maturity, fixed maturity securities, fair value | 1,006 |  | 1,078 |
Commercial mortgage and other loans, fair value | 0 |  | 0 |
Other investments carried at amortized cost, fair value | 32 | [1] | 34 | [2]
Assets fair value disclosure financial instruments carried at cost | 1,038 |  | 1,112 |
Liabilities: |  |  |  |
Other policyholders' funds fair value disclosure | 0 |  | 0 |
Notes payable, fair value disclosure | 5,887 |  | 6,024 |
Liabilities fair value disclosure financial instruments carried at cost | 5,887 |  | 6,024 |
Level 2 | Government and agencies |  |  |  |
Assets: |  |  |  |
Held to maturity, fixed maturity securities, fair value | 170 |  | 180 |
Level 2 | Municipalities |  |  |  |
Assets: |  |  |  |
Held to maturity, fixed maturity securities, fair value | 314 |  | 335 |
Level 2 | Public utilities |  |  |  |
Assets: |  |  |  |
Held to maturity, fixed maturity securities, fair value | 39 |  | 41 |
Level 2 | Sovereign and supranational |  |  |  |
Assets: |  |  |  |
Held to maturity, fixed maturity securities, fair value | 462 |  | 500 |
Level 2 | Other corporate |  |  |  |
Assets: |  |  |  |
Held to maturity, fixed maturity securities, fair value | 21 |  | 22 |
Level 3 |  |  |  |
Assets: |  |  |  |
Held to maturity, fixed maturity securities, fair value | 0 |  | 0 |
Commercial mortgage and other loans, fair value | 13,014 |  | 13,212 |
Other investments carried at amortized cost, fair value | 0 | [1] | 0 | [2]
Assets fair value disclosure financial instruments carried at cost | 13,014 |  | 13,212 |
Liabilities: |  |  |  |
Other policyholders' funds fair value disclosure | 6,020 |  | 6,543 |
Notes payable, fair value disclosure | 735 |  | 802 |
Liabilities fair value disclosure financial instruments carried at cost | 6,755 |  | 7,345 |
Level 3 | Government and agencies |  |  |  |
Assets: |  |  |  |
Held to maturity, fixed maturity securities, fair value | 0 |  | 0 |
Level 3 | Municipalities |  |  |  |
Assets: |  |  |  |
Held to maturity, fixed maturity securities, fair value | 0 |  | 0 |
Level 3 | Public utilities |  |  |  |
Assets: |  |  |  |
Held to maturity, fixed maturity securities, fair value | 0 |  | 0 |
Level 3 | Sovereign and supranational |  |  |  |
Assets: |  |  |  |
Held to maturity, fixed maturity securities, fair value | 0 |  | 0 |
Level 3 | Other corporate |  |  |  |
Assets: |  |  |  |
Held to maturity, fixed maturity securities, fair value | $ 0 |  | $ 0 |
[1] | Excludes policy loans of $202 and equity method investments of $2,551, at carrying value
[2] | Excludes policy loans of $214 and equity method investments of $2,290, at carrying value

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