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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 | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Assets: |  |
Fixed maturity securities, available-for-sale | $ 67,276 | $ 65,269
Equity securities | 885 | 796
Other investments | 2,346 | 1,599
Cash and cash equivalents | 6,768 | 6,229
Asset derivatives | 107 | 240
Total assets | 77,382 | 74,133
Liabilities: |  |
Liability derivatives | 934 | 933
Total liabilities | 934 | 933
Foreign currency swaps |  |
Assets: |  |
Asset derivatives | 44 | 55
Liabilities: |  |
Liability derivatives | 685 | 604
Foreign currency forwards |  |
Assets: |  |
Asset derivatives | 46 | 185
Liabilities: |  |
Liability derivatives | 18 |
Foreign currency options |  |
Assets: |  |
Asset derivatives | 1 |
Interest rate swaps |  |
Assets: |  |
Asset derivatives | 16 |
Liabilities: |  |
Liability derivatives | 231 | 329
Government and agencies |  |
Assets: |  |
Fixed maturity securities, available-for-sale | 16,583 | 17,846
Municipalities |  |
Assets: |  |
Fixed maturity securities, available-for-sale | 1,986 | 2,034
Mortgage- and asset-backed securities |  |
Assets: |  |
Fixed maturity securities, available-for-sale | 4,362 | 3,563
Public utilities |  |
Assets: |  |
Fixed maturity securities, available-for-sale | 7,430 | 7,045
Sovereign and supranational |  |
Assets: |  |
Fixed maturity securities, available-for-sale | 425 | 416
Banks/financial institutions |  |
Assets: |  |
Fixed maturity securities, available-for-sale | 9,719 | 8,956
Other corporate |  |
Assets: |  |
Fixed maturity securities, available-for-sale | 26,771 | 25,409
Level 1 |  |
Assets: |  |
Fixed maturity securities, available-for-sale | 15,854 | 17,088
Equity securities | 722 | 639
Other investments | 2,346 | 1,599
Cash and cash equivalents | 6,768 | 6,229
Asset derivatives | 0 | 0
Total assets | 25,690 | 25,555
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 |
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 | 15,854 | 17,088
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 | 48,176 | 46,114
Equity securities | 0 | 0
Other investments | 0 | 0
Cash and cash equivalents | 0 | 0
Asset derivatives | 107 | 240
Total assets | 48,283 | 46,354
Liabilities: |  |
Total liabilities | 934 | 933
Level 2 | Foreign currency swaps |  |
Assets: |  |
Asset derivatives | 44 | 55
Liabilities: |  |
Liability derivatives | 685 | 604
Level 2 | Foreign currency forwards |  |
Assets: |  |
Asset derivatives | 46 | 185
Liabilities: |  |
Liability derivatives | 18 |
Level 2 | Foreign currency options |  |
Assets: |  |
Asset derivatives | 1 |
Level 2 | Interest rate swaps |  |
Assets: |  |
Asset derivatives | 16 |
Liabilities: |  |
Liability derivatives | 231 | 329
Level 2 | Government and agencies |  |
Assets: |  |
Fixed maturity securities, available-for-sale | 729 | 758
Level 2 | Municipalities |  |
Assets: |  |
Fixed maturity securities, available-for-sale | 1,986 | 2,034
Level 2 | Mortgage- and asset-backed securities |  |
Assets: |  |
Fixed maturity securities, available-for-sale | 2,116 | 2,407
Level 2 | Public utilities |  |
Assets: |  |
Fixed maturity securities, available-for-sale | 6,624 | 6,398
Level 2 | Sovereign and supranational |  |
Assets: |  |
Fixed maturity securities, available-for-sale | 403 | 393
Level 2 | Banks/financial institutions |  |
Assets: |  |
Fixed maturity securities, available-for-sale | 9,710 | 8,946
Level 2 | Other corporate |  |
Assets: |  |
Fixed maturity securities, available-for-sale | 26,608 | 25,178
Level 3 |  |
Assets: |  |
Fixed maturity securities, available-for-sale | 3,246 | 2,067
Equity securities | 163 | 157
Other investments | 0 | 0
Cash and cash equivalents | 0 | 0
Asset derivatives | 0 | 0
Total assets | 3,409 | 2,224
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 |
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 | 2,246 | 1,156
Level 3 | Public utilities |  |
Assets: |  |
Fixed maturity securities, available-for-sale | 806 | 647
Level 3 | Sovereign and supranational |  |
Assets: |  |
Fixed maturity securities, available-for-sale | 22 | 23
Level 3 | Banks/financial institutions |  |
Assets: |  |
Fixed maturity securities, available-for-sale | 9 | 10
Level 3 | Other corporate |  |
Assets: |  |
Fixed maturity securities, available-for-sale | $ 163 | $ 231

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