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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 | Sep. 30, 2025 | Dec. 31, 2024
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Other investments |  | $ 7,495 |  | $ 5,958 |
Assets: |  |  |  |  |
Fixed maturity securities, held-to-maturity, amortized cost |  | 16,960 |  | 15,971 |
Fixed maturity securities, held-to-maturity, fair value |  | 16,770 |  | 16,772 |
Commercial mortgage and other loans |  | 10,137 |  | 10,869 |
Commercial mortgage and other loans, fair value |  | 10,013 |  | 10,653 |
Other investments carried at amortized cost |  | 31 | [1] | 39 | [2]
Other investments carried at amortized cost, fair value |  | 31 | [1] | 39 | [2]
Total financial instruments assets not carried at fair value |  | 27,123 |  | 26,874 |
Assets fair value disclosure financial instruments carried at cost |  | 26,814 |  | 27,464 |
Liabilities: |  |  |  |  |
Other policyholders’ funds |  | 5,785 |  | 5,460 |
Other policyholders' funds fair value disclosure |  | 5,711 |  | 5,389 |
Notes payable |  | 8,598 |  | 7,402 |
Notes payable, fair value disclosure |  | 8,168 |  | 7,027 |
Total financial instrument liabilities not carried at fair value |  | 14,383 |  | 12,862 |
Liabilities fair value disclosure financial instruments carried at cost |  | 13,879 |  | 12,416 |
Government and agencies |  |  |  |  |
Assets: |  |  |  |  |
Fixed maturity securities, held-to-maturity, amortized cost |  | 16,258 |  | 15,309 |
Fixed maturity securities, held-to-maturity, fair value |  | 16,068 |  | 16,059 |
Municipalities |  |  |  |  |
Assets: |  |  |  |  |
Fixed maturity securities, held-to-maturity, amortized cost |  | 248 |  | 235 |
Fixed maturity securities, held-to-maturity, fair value |  | 252 |  | 257 |
Public utilities |  |  |  |  |
Assets: |  |  |  |  |
Fixed maturity securities, held-to-maturity, amortized cost |  | 34 |  | 32 |
Fixed maturity securities, held-to-maturity, fair value |  | 32 |  | 33 |
Sovereign and supranational |  |  |  |  |
Assets: |  |  |  |  |
Fixed maturity securities, held-to-maturity, amortized cost |  | 398 |  | 374 |
Fixed maturity securities, held-to-maturity, fair value |  | 400 |  | 405 |
Other corporate |  |  |  |  |
Assets: |  |  |  |  |
Fixed maturity securities, held-to-maturity, amortized cost |  | 17 |  | 16 |
Fixed maturity securities, held-to-maturity, fair value |  | 18 |  | 18 |
Policy loans |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Other investments |  | 217 |  | 203 |
Equity method investments |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Other investments | [3] | 3,961 |  | 3,435 |
Real estate owned |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Other investments |  | 940 |  | 682 |
Level 1 |  |  |  |  |
Assets: |  |  |  |  |
Fixed maturity securities, held-to-maturity, fair value |  | 15,925 |  | 15,916 |
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 |  | 15,925 |  | 15,916 |
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 |  | 15,925 |  | 15,916 |
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 |  | 845 |  | 856 |
Commercial mortgage and other loans, fair value |  | 0 |  | 0 |
Other investments carried at amortized cost, fair value |  | 31 | [1] | 39 | [2]
Assets fair value disclosure financial instruments carried at cost |  | 876 |  | 895 |
Liabilities: |  |  |  |  |
Other policyholders' funds fair value disclosure |  | 0 |  | 0 |
Notes payable, fair value disclosure |  | 7,451 |  | 6,352 |
Liabilities fair value disclosure financial instruments carried at cost |  | 7,451 |  | 6,352 |
Level 2 | Government and agencies |  |  |  |  |
Assets: |  |  |  |  |
Fixed maturity securities, held-to-maturity, fair value |  | 143 |  | 143 |
Level 2 | Municipalities |  |  |  |  |
Assets: |  |  |  |  |
Fixed maturity securities, held-to-maturity, fair value |  | 252 |  | 257 |
Level 2 | Public utilities |  |  |  |  |
Assets: |  |  |  |  |
Fixed maturity securities, held-to-maturity, fair value |  | 32 |  | 33 |
Level 2 | Sovereign and supranational |  |  |  |  |
Assets: |  |  |  |  |
Fixed maturity securities, held-to-maturity, fair value |  | 400 |  | 405 |
Level 2 | Other corporate |  |  |  |  |
Assets: |  |  |  |  |
Fixed maturity securities, held-to-maturity, fair value |  | 18 |  | 18 |
Level 3 |  |  |  |  |
Assets: |  |  |  |  |
Fixed maturity securities, held-to-maturity, fair value |  | 0 |  | 0 |
Commercial mortgage and other loans, fair value |  | 10,013 |  | 10,653 |
Other investments carried at amortized cost, fair value |  | 0 | [1] | 0 | [2]
Assets fair value disclosure financial instruments carried at cost |  | 10,013 |  | 10,653 |
Liabilities: |  |  |  |  |
Other policyholders' funds fair value disclosure |  | 5,711 |  | 5,389 |
Notes payable, fair value disclosure |  | 717 |  | 675 |
Liabilities fair value disclosure financial instruments carried at cost |  | 6,428 |  | 6,064 |
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 $217, equity method investments of $3,961, and REO of $940, at carrying valu e
[2] | Excludes policy loans of $203, equity method investments of $3,435, and REO of $682, at carrying value
[3] | Includes tax credit investments and asset classes such as private equity and real estate funds

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