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INVESTMENTS - Components of Net Investment Income (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gross investment income |  |  |  |  |  |  |  |  |  | $ 4,046 | $ 3,882 | $ 4,036
Less investment expenses |  |  |  |  |  |  |  |  |  | 235 | 226 | 218
Net investment income |  | $ 865 | $ 1,004 | $ 999 | $ 943 | $ 896 | $ 920 | $ 937 | $ 903 | 3,811 | 3,656 | 3,818
Corporate and other |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net investment income |  |  |  |  |  |  |  |  |  | (77) | 30 | (73)
Change in value of federal historic rehabilitation and solar tax credit investments |  |  |  |  |  |  |  |  |  | (343) | (91) | (138)
Federal historic rehabilitation and solar tax credits, amount |  |  |  |  |  |  |  |  |  | 334 | 83 | 115
Fixed maturity securities |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gross investment income |  |  |  |  |  |  |  |  |  | 2,873 | 2,926 | 3,068
Equity securities |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gross investment income |  |  |  |  |  |  |  |  |  | 28 | 31 | 35
Commercial mortgage and other loans |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gross investment income |  |  |  |  |  |  |  |  |  | 1,002 | 716 | 570
Other investments |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gross investment income | [1] |  |  |  |  |  |  |  |  |  | 131 | 356
Gross investment loss | [1] |  |  |  |  |  |  |  |  | (70) |  |
Short-term investments and cash equivalents |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gross investment income |  |  |  |  |  |  |  |  |  | $ 213 | $ 78 | $ 7
[1] | The change in value of federal historic rehabilitation and solar investments in partnerships of $343, $91, and $138 in 2023, 2022, and 2021, respectively, is included as a reduction to net investment income. Tax credits on these investments of $334, $83, and $115 in 2023, 2022, and 2021, respectively, have been recorded as an income tax benefit in the consolidated statement of earnings.

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- Definition Amount, before investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 946 -SubTopic 830 -Name Accounting Standards Codification -Section 55 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480167/946-830-55-10 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(2)(b)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483586/944-220-S99-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 946 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07(1)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483575/946-220-S99-1 + Details
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