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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, 2023 | Dec. 31, 2022
--- | --- | ---
Assets: |  |
Available for sale, fixed maturity securities | $ 78,099 | $ 75,741
Equity securities | 1,087 | 1,091
Other investments | 2,561 | 1,532
Cash and cash equivalents | 3,809 | 3,943
Asset derivatives | 549 | 617
Total assets | 86,105 | 82,924
Liabilities: |  |
Liability derivatives | 1,058 | 1,698
Total liabilities | 1,058 | 1,698
Foreign currency swaps |  |
Assets: |  |
Asset derivatives | 118 | 128
Liabilities: |  |
Liability derivatives | 399 | 390
Foreign currency forwards |  |
Assets: |  |
Asset derivatives | 359 | 400
Liabilities: |  |
Liability derivatives | 176 | 725
Foreign currency options |  |
Assets: |  |
Asset derivatives | 46 | 82
Interest rate swaps |  |
Assets: |  |
Asset derivatives | 26 | 7
Liabilities: |  |
Liability derivatives | 483 | 583
Government and agencies |  |
Assets: |  |
Available for sale, fixed maturity securities | 25,893 | 25,114
Municipalities |  |
Assets: |  |
Available for sale, fixed maturity securities | 2,416 | 2,320
Mortgage- and asset-backed securities |  |
Assets: |  |
Available for sale, fixed maturity securities | 2,567 | 2,146
Public utilities |  |
Assets: |  |
Available for sale, fixed maturity securities | 7,933 | 7,666
Sovereign and supranational |  |
Assets: |  |
Available for sale, fixed maturity securities | 728 | 834
Banks/financial institutions |  |
Assets: |  |
Available for sale, fixed maturity securities | 9,420 | 9,299
Other corporate |  |
Assets: |  |
Available for sale, fixed maturity securities | 29,142 | 28,362
Level 1 |  |
Assets: |  |
Available for sale, fixed maturity securities | 24,903 | 24,158
Equity securities | 806 | 822
Other investments | 2,561 | 1,532
Cash and cash equivalents | 3,809 | 3,943
Asset derivatives | 0 | 0
Total assets | 32,079 | 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 | 0
Liabilities: |  |
Liability derivatives | 0 | 0
Level 1 | Government and agencies |  |
Assets: |  |
Available for sale, fixed maturity securities | 24,903 | 24,158
Level 1 | Municipalities |  |
Assets: |  |
Available for sale, fixed maturity securities | 0 | 0
Level 1 | Mortgage- and asset-backed securities |  |
Assets: |  |
Available for sale, fixed maturity securities | 0 | 0
Level 1 | Public utilities |  |
Assets: |  |
Available for sale, fixed maturity securities | 0 | 0
Level 1 | Sovereign and supranational |  |
Assets: |  |
Available for sale, fixed maturity securities | 0 | 0
Level 1 | Banks/financial institutions |  |
Assets: |  |
Available for sale, fixed maturity securities | 0 | 0
Level 1 | Other corporate |  |
Assets: |  |
Available for sale, fixed maturity securities | 0 | 0
Level 2 |  |
Assets: |  |
Available for sale, fixed maturity securities | 51,477 | 49,805
Equity securities | 60 | 60
Other investments | 0 | 0
Cash and cash equivalents | 0 | 0
Asset derivatives | 549 | 617
Total assets | 52,086 | 50,482
Liabilities: |  |
Total liabilities | 1,058 | 1,698
Level 2 | Foreign currency swaps |  |
Assets: |  |
Asset derivatives | 118 | 128
Liabilities: |  |
Liability derivatives | 399 | 390
Level 2 | Foreign currency forwards |  |
Assets: |  |
Asset derivatives | 359 | 400
Liabilities: |  |
Liability derivatives | 176 | 725
Level 2 | Foreign currency options |  |
Assets: |  |
Asset derivatives | 46 | 82
Level 2 | Interest rate swaps |  |
Assets: |  |
Asset derivatives | 26 | 7
Liabilities: |  |
Liability derivatives | 483 | 583
Level 2 | Government and agencies |  |
Assets: |  |
Available for sale, fixed maturity securities | 990 | 956
Level 2 | Municipalities |  |
Assets: |  |
Available for sale, fixed maturity securities | 2,416 | 2,320
Level 2 | Mortgage- and asset-backed securities |  |
Assets: |  |
Available for sale, fixed maturity securities | 2,149 | 1,803
Level 2 | Public utilities |  |
Assets: |  |
Available for sale, fixed maturity securities | 7,583 | 7,169
Level 2 | Sovereign and supranational |  |
Assets: |  |
Available for sale, fixed maturity securities | 691 | 797
Level 2 | Banks/financial institutions |  |
Assets: |  |
Available for sale, fixed maturity securities | 9,259 | 9,140
Level 2 | Other corporate |  |
Assets: |  |
Available for sale, fixed maturity securities | 28,389 | 27,620
Level 3 |  |
Assets: |  |
Available for sale, fixed maturity securities | 1,719 | 1,778
Equity securities | 221 | 209
Other investments | 0 | 0
Cash and cash equivalents | 0 | 0
Asset derivatives | 0 | 0
Total assets | 1,940 | 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 | 0
Liabilities: |  |
Liability derivatives | 0 | 0
Level 3 | Government and agencies |  |
Assets: |  |
Available for sale, fixed maturity securities | 0 | 0
Level 3 | Municipalities |  |
Assets: |  |
Available for sale, fixed maturity securities | 0 | 0
Level 3 | Mortgage- and asset-backed securities |  |
Assets: |  |
Available for sale, fixed maturity securities | 418 | 343
Level 3 | Public utilities |  |
Assets: |  |
Available for sale, fixed maturity securities | 350 | 497
Level 3 | Sovereign and supranational |  |
Assets: |  |
Available for sale, fixed maturity securities | 37 | 37
Level 3 | Banks/financial institutions |  |
Assets: |  |
Available for sale, fixed maturity securities | 161 | 159
Level 3 | Other corporate |  |
Assets: |  |
Available for sale, fixed maturity securities | $ 753 | $ 742

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