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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 | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Other investments | $ 6,677 |  | $ 4,530 |
Assets: |  |  |  |
Amortized Cost | 16,694 |  | 17,824 |
Fixed maturity securities, held-to-maturity, fair value | 18,245 |  | 19,657 |
Commercial mortgage and other loans | 12,360 |  | 12,527 |
Commercial mortgage and other loans, fair value | 12,017 |  | 12,217 |
Other investments carried at amortized cost | 42 | [1] | 35 | [2]
Other investments carried at amortized cost, fair value | 42 | [1] | 35 | [2]
Total financial instruments assets not carried at fair value | 29,091 |  | 30,381 |
Assets fair value disclosure financial instruments carried at cost | 30,304 |  | 31,909 |
Liabilities: |  |  |  |
Other policyholders’ funds | 5,831 |  | 6,169 |
Other policyholders' funds fair value disclosure | 5,750 |  | 6,080 |
Notes payable | 7,799 |  | 7,240 |
Notes payable, fair value disclosure | 7,466 |  | 6,930 |
Total financial instrument liabilities not carried at fair value | 13,630 |  | 13,409 |
Liabilities fair value disclosure financial instruments carried at cost | 13,216 |  | 13,010 |
Government and agencies |  |  |  |
Assets: |  |  |  |
Amortized Cost | 16,000 |  | 17,083 |
Fixed maturity securities, held-to-maturity, fair value | 17,474 |  | 18,829 |
Municipalities |  |  |  |
Assets: |  |  |  |
Amortized Cost | 248 |  | 266 |
Fixed maturity securities, held-to-maturity, fair value | 285 |  | 307 |
Public utilities |  |  |  |
Assets: |  |  |  |
Amortized Cost | 33 |  | 34 |
Fixed maturity securities, held-to-maturity, fair value | 36 |  | 38 |
Sovereign and supranational |  |  |  |
Assets: |  |  |  |
Amortized Cost | 391 |  | 418 |
Fixed maturity securities, held-to-maturity, fair value | 431 |  | 462 |
Other corporate |  |  |  |
Assets: |  |  |  |
Amortized Cost | 17 |  | 18 |
Fixed maturity securities, held-to-maturity, fair value | 19 |  | 21 |
Policy loans |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Other investments | 203 |  | 214 |
Equity method investments |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Other investments | 2,838 |  | 2,750 |
Real estate owned |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Other investments | 253 |  | 227 |
Level 1 |  |  |  |
Assets: |  |  |  |
Fixed maturity securities, held-to-maturity, fair value | 17,319 |  | 18,662 |
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 | 17,319 |  | 18,662 |
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: |  |  |  |
Fixed maturity securities, held-to-maturity, fair value | 17,319 |  | 18,662 |
Level 1 | Municipalities |  |  |  |
Assets: |  |  |  |
Fixed maturity securities, held-to-maturity, fair value | 0 |  | 0 |
Level 1 | Public utilities |  |  |  |
Assets: |  |  |  |
Fixed maturity securities, held-to-maturity, fair value | 0 |  | 0 |
Level 1 | Sovereign and supranational |  |  |  |
Assets: |  |  |  |
Fixed maturity securities, held-to-maturity, fair value | 0 |  | 0 |
Level 1 | Other corporate |  |  |  |
Assets: |  |  |  |
Fixed maturity securities, held-to-maturity, fair value | 0 |  | 0 |
Level 2 |  |  |  |
Assets: |  |  |  |
Fixed maturity securities, held-to-maturity, fair value | 926 |  | 995 |
Commercial mortgage and other loans, fair value | 0 |  | 0 |
Other investments carried at amortized cost, fair value | 42 | [1] | 35 | [2]
Assets fair value disclosure financial instruments carried at cost | 968 |  | 1,030 |
Liabilities: |  |  |  |
Other policyholders' funds fair value disclosure | 0 |  | 0 |
Notes payable, fair value disclosure | 6,762 |  | 6,178 |
Liabilities fair value disclosure financial instruments carried at cost | 6,762 |  | 6,178 |
Level 2 | Government and agencies |  |  |  |
Assets: |  |  |  |
Fixed maturity securities, held-to-maturity, fair value | 155 |  | 167 |
Level 2 | Municipalities |  |  |  |
Assets: |  |  |  |
Fixed maturity securities, held-to-maturity, fair value | 285 |  | 307 |
Level 2 | Public utilities |  |  |  |
Assets: |  |  |  |
Fixed maturity securities, held-to-maturity, fair value | 36 |  | 38 |
Level 2 | Sovereign and supranational |  |  |  |
Assets: |  |  |  |
Fixed maturity securities, held-to-maturity, fair value | 431 |  | 462 |
Level 2 | Other corporate |  |  |  |
Assets: |  |  |  |
Fixed maturity securities, held-to-maturity, fair value | 19 |  | 21 |
Level 3 |  |  |  |
Assets: |  |  |  |
Fixed maturity securities, held-to-maturity, fair value | 0 |  | 0 |
Commercial mortgage and other loans, fair value | 12,017 |  | 12,217 |
Other investments carried at amortized cost, fair value | 0 | [1] | 0 | [2]
Assets fair value disclosure financial instruments carried at cost | 12,017 |  | 12,217 |
Liabilities: |  |  |  |
Other policyholders' funds fair value disclosure | 5,750 |  | 6,080 |
Notes payable, fair value disclosure | 704 |  | 752 |
Liabilities fair value disclosure financial instruments carried at cost | 6,454 |  | 6,832 |
Level 3 | Government and agencies |  |  |  |
Assets: |  |  |  |
Fixed maturity securities, held-to-maturity, fair value | 0 |  | 0 |
Level 3 | Municipalities |  |  |  |
Assets: |  |  |  |
Fixed maturity securities, held-to-maturity, fair value | 0 |  | 0 |
Level 3 | Public utilities |  |  |  |
Assets: |  |  |  |
Fixed maturity securities, held-to-maturity, fair value | 0 |  | 0 |
Level 3 | Sovereign and supranational |  |  |  |
Assets: |  |  |  |
Fixed maturity securities, held-to-maturity, fair value | 0 |  | 0 |
Level 3 | Other corporate |  |  |  |
Assets: |  |  |  |
Fixed maturity securities, held-to-maturity, fair value | $ 0 |  | $ 0 |
[1] | Excludes policy loans of $203, equity method investments of $2,838, and REO of $253, at carrying valu e.
[2] | Excludes policy loans of $214, equity method investments of $2,750, and REO of $227, at carrying value.

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