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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, 2023 | Dec. 31, 2022
--- | --- | ---
Assets: |  |
Fixed maturity securities, available-for-sale | $ 69,801 | $ 75,741
Equity securities | 990 | 1,091
Other investments | 2,288 | 1,532
Cash and cash equivalents | 5,502 | 3,943
Asset derivatives | 578 | 617
Total assets | 79,159 | 82,924
Liabilities: |  |
Liability derivatives | 1,666 | 1,698
Total liabilities | 1,666 | 1,698
Foreign currency swaps |  |
Assets: |  |
Asset derivatives | 98 | 128
Liabilities: |  |
Liability derivatives | 442 | 390
Foreign currency forwards |  |
Assets: |  |
Asset derivatives | 479 | 400
Liabilities: |  |
Liability derivatives | 588 | 725
Foreign currency options |  |
Assets: |  |
Asset derivatives | 1 | 82
Interest rate swaps |  |
Assets: |  |
Asset derivatives |  | 7
Liabilities: |  |
Liability derivatives | 636 | 583
Government and agencies |  |
Assets: |  |
Fixed maturity securities, available-for-sale | 21,952 | 25,114
Municipalities |  |
Assets: |  |
Fixed maturity securities, available-for-sale | 2,141 | 2,320
Mortgage- and asset-backed securities |  |
Assets: |  |
Fixed maturity securities, available-for-sale | 2,996 | 2,146
Public utilities |  |
Assets: |  |
Fixed maturity securities, available-for-sale | 7,250 | 7,666
Sovereign and supranational |  |
Assets: |  |
Fixed maturity securities, available-for-sale | 511 | 834
Banks/financial institutions |  |
Assets: |  |
Fixed maturity securities, available-for-sale | 8,341 | 9,299
Other corporate |  |
Assets: |  |
Fixed maturity securities, available-for-sale | 26,610 | 28,362
Level 1 |  |
Assets: |  |
Fixed maturity securities, available-for-sale | 21,095 | 24,158
Equity securities | 787 | 822
Other investments | 2,288 | 1,532
Cash and cash equivalents | 5,502 | 3,943
Asset derivatives | 0 | 0
Total assets | 29,672 | 30,455
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 | 0
Level 1 | Foreign currency options |  |
Assets: |  |
Asset derivatives | 0 | 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 | 21,095 | 24,158
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 | 47,102 | 49,805
Equity securities | 0 | 60
Other investments | 0 | 0
Cash and cash equivalents | 0 | 0
Asset derivatives | 578 | 617
Total assets | 47,680 | 50,482
Liabilities: |  |
Total liabilities | 1,666 | 1,698
Level 2 | Foreign currency swaps |  |
Assets: |  |
Asset derivatives | 98 | 128
Liabilities: |  |
Liability derivatives | 442 | 390
Level 2 | Foreign currency forwards |  |
Assets: |  |
Asset derivatives | 479 | 400
Liabilities: |  |
Liability derivatives | 588 | 725
Level 2 | Foreign currency options |  |
Assets: |  |
Asset derivatives | 1 | 82
Level 2 | Interest rate swaps |  |
Assets: |  |
Asset derivatives |  | 7
Liabilities: |  |
Liability derivatives | 636 | 583
Level 2 | Government and agencies |  |
Assets: |  |
Fixed maturity securities, available-for-sale | 857 | 956
Level 2 | Municipalities |  |
Assets: |  |
Fixed maturity securities, available-for-sale | 2,141 | 2,320
Level 2 | Mortgage- and asset-backed securities |  |
Assets: |  |
Fixed maturity securities, available-for-sale | 2,316 | 1,803
Level 2 | Public utilities |  |
Assets: |  |
Fixed maturity securities, available-for-sale | 6,991 | 7,169
Level 2 | Sovereign and supranational |  |
Assets: |  |
Fixed maturity securities, available-for-sale | 480 | 797
Level 2 | Banks/financial institutions |  |
Assets: |  |
Fixed maturity securities, available-for-sale | 8,271 | 9,140
Level 2 | Other corporate |  |
Assets: |  |
Fixed maturity securities, available-for-sale | 26,046 | 27,620
Level 3 |  |
Assets: |  |
Fixed maturity securities, available-for-sale | 1,604 | 1,778
Equity securities | 203 | 209
Other investments | 0 | 0
Cash and cash equivalents | 0 | 0
Asset derivatives | 0 | 0
Total assets | 1,807 | 1,987
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 | 0
Level 3 | Foreign currency options |  |
Assets: |  |
Asset derivatives | 0 | 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 | 680 | 343
Level 3 | Public utilities |  |
Assets: |  |
Fixed maturity securities, available-for-sale | 259 | 497
Level 3 | Sovereign and supranational |  |
Assets: |  |
Fixed maturity securities, available-for-sale | 31 | 37
Level 3 | Banks/financial institutions |  |
Assets: |  |
Fixed maturity securities, available-for-sale | 70 | 159
Level 3 | Other corporate |  |
Assets: |  |
Fixed maturity securities, available-for-sale | $ 564 | $ 742

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