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FAIR VALUE MEASUREMENTS - Fair Value Hierarchy Levels of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Assets: |  |
Fixed maturity securities, available-for-sale | $ 70,130 | $ 73,290
Equity securities | 762 | 1,088
Other investments | 3,341 | 1,304
Cash and cash equivalents | 5,098 | 4,306
Asset derivatives | $ 321 | $ 337
Derivative Asset, Statement of Financial Position [Extensible Enumeration] | Other | Other
Total assets | $ 79,652 | $ 80,325
Liabilities: |  |
Liability derivatives | 1,135 | 1,430
Total liabilities | 1,135 | 1,430
Foreign currency swaps |  |
Assets: |  |
Asset derivatives | 81 | 86
Liabilities: |  |
Liability derivatives | 583 | 507
Foreign currency forwards |  |
Assets: |  |
Asset derivatives | 202 | 238
Liabilities: |  |
Liability derivatives |  | 504
Foreign currency options |  |
Assets: |  |
Asset derivatives | 38 | 2
Liabilities: |  |
Liability derivatives | 69 |
Interest rate swaps |  |
Assets: |  |
Asset derivatives |  | 11
Liabilities: |  |
Liability derivatives | 483 | 419
Government and agencies |  |
Assets: |  |
Fixed maturity securities, available-for-sale | 20,814 | 22,600
Municipalities |  |
Assets: |  |
Fixed maturity securities, available-for-sale | 2,210 | 2,298
Mortgage- and asset-backed securities |  |
Assets: |  |
Fixed maturity securities, available-for-sale | 3,385 | 3,086
Public utilities |  |
Assets: |  |
Fixed maturity securities, available-for-sale | 7,313 | 7,592
Sovereign and supranational |  |
Assets: |  |
Fixed maturity securities, available-for-sale | 490 | 537
Banks/financial institutions |  |
Assets: |  |
Fixed maturity securities, available-for-sale | 8,899 | 8,835
Other corporate |  |
Assets: |  |
Fixed maturity securities, available-for-sale | 27,019 | 28,342
Level 1 |  |
Assets: |  |
Fixed maturity securities, available-for-sale | 19,976 | 21,700
Equity securities | 603 | 840
Other investments | 3,341 | 1,304
Cash and cash equivalents | 5,098 | 4,306
Asset derivatives | 0 | 0
Total assets | 29,018 | 28,150
Liabilities: |  |
Total liabilities | 0 | 0
Level 1 | Foreign currency swaps |  |
Assets: |  |
Asset derivatives | 0 | 0
Liabilities: |  |
Liability derivatives | 0 | 0
Level 1 | Foreign currency forwards |  |
Assets: |  |
Asset derivatives | 0 | 0
Liabilities: |  |
Liability derivatives |  | 0
Level 1 | Foreign currency options |  |
Assets: |  |
Asset derivatives | 0 | 0
Liabilities: |  |
Liability derivatives | 0 |
Level 1 | Interest rate swaps |  |
Assets: |  |
Asset derivatives |  | 0
Liabilities: |  |
Liability derivatives | 0 | 0
Level 1 | Government and agencies |  |
Assets: |  |
Fixed maturity securities, available-for-sale | 19,976 | 21,700
Level 1 | Municipalities |  |
Assets: |  |
Fixed maturity securities, available-for-sale | 0 | 0
Level 1 | Mortgage- and asset-backed securities |  |
Assets: |  |
Fixed maturity securities, available-for-sale | 0 | 0
Level 1 | Public utilities |  |
Assets: |  |
Fixed maturity securities, available-for-sale | 0 | 0
Level 1 | Sovereign and supranational |  |
Assets: |  |
Fixed maturity securities, available-for-sale | 0 | 0
Level 1 | Banks/financial institutions |  |
Assets: |  |
Fixed maturity securities, available-for-sale | 0 | 0
Level 1 | Other corporate |  |
Assets: |  |
Fixed maturity securities, available-for-sale | 0 | 0
Level 2 |  |
Assets: |  |
Fixed maturity securities, available-for-sale | 48,236 | 49,809
Equity securities | 0 | 0
Other investments | 0 | 0
Cash and cash equivalents | 0 | 0
Asset derivatives | 321 | 337
Total assets | 48,557 | 50,146
Liabilities: |  |
Total liabilities | 1,135 | 1,430
Level 2 | Foreign currency swaps |  |
Assets: |  |
Asset derivatives | 81 | 86
Liabilities: |  |
Liability derivatives | 583 | 507
Level 2 | Foreign currency forwards |  |
Assets: |  |
Asset derivatives | 202 | 238
Liabilities: |  |
Liability derivatives |  | 504
Level 2 | Foreign currency options |  |
Assets: |  |
Asset derivatives | 38 | 2
Liabilities: |  |
Liability derivatives | 69 |
Level 2 | Interest rate swaps |  |
Assets: |  |
Asset derivatives |  | 11
Liabilities: |  |
Liability derivatives | 483 | 419
Level 2 | Government and agencies |  |
Assets: |  |
Fixed maturity securities, available-for-sale | 838 | 900
Level 2 | Municipalities |  |
Assets: |  |
Fixed maturity securities, available-for-sale | 2,210 | 2,298
Level 2 | Mortgage- and asset-backed securities |  |
Assets: |  |
Fixed maturity securities, available-for-sale | 2,526 | 2,314
Level 2 | Public utilities |  |
Assets: |  |
Fixed maturity securities, available-for-sale | 6,806 | 7,339
Level 2 | Sovereign and supranational |  |
Assets: |  |
Fixed maturity securities, available-for-sale | 462 | 507
Level 2 | Banks/financial institutions |  |
Assets: |  |
Fixed maturity securities, available-for-sale | 8,825 | 8,757
Level 2 | Other corporate |  |
Assets: |  |
Fixed maturity securities, available-for-sale | 26,569 | 27,694
Level 3 |  |
Assets: |  |
Fixed maturity securities, available-for-sale | 1,918 | 1,781
Equity securities | 159 | 248
Other investments | 0 | 0
Cash and cash equivalents | 0 | 0
Asset derivatives | 0 | 0
Total assets | 2,077 | 2,029
Liabilities: |  |
Total liabilities | 0 | 0
Level 3 | Foreign currency swaps |  |
Assets: |  |
Asset derivatives | 0 | 0
Liabilities: |  |
Liability derivatives | 0 | 0
Level 3 | Foreign currency forwards |  |
Assets: |  |
Asset derivatives | 0 | 0
Liabilities: |  |
Liability derivatives |  | 0
Level 3 | Foreign currency options |  |
Assets: |  |
Asset derivatives | 0 | 0
Liabilities: |  |
Liability derivatives | 0 |
Level 3 | Interest rate swaps |  |
Assets: |  |
Asset derivatives |  | 0
Liabilities: |  |
Liability derivatives | 0 | 0
Level 3 | Government and agencies |  |
Assets: |  |
Fixed maturity securities, available-for-sale | 0 | 0
Level 3 | Municipalities |  |
Assets: |  |
Fixed maturity securities, available-for-sale | 0 | 0
Level 3 | Mortgage- and asset-backed securities |  |
Assets: |  |
Fixed maturity securities, available-for-sale | 859 | 772
Level 3 | Public utilities |  |
Assets: |  |
Fixed maturity securities, available-for-sale | 507 | 253
Level 3 | Sovereign and supranational |  |
Assets: |  |
Fixed maturity securities, available-for-sale | 28 | 30
Level 3 | Banks/financial institutions |  |
Assets: |  |
Fixed maturity securities, available-for-sale | 74 | 78
Level 3 | Other corporate |  |
Assets: |  |
Fixed maturity securities, available-for-sale | $ 450 | $ 648

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