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UNAUDITED CONSOLIDATED QUARTERLY FINANCIAL DATA - Schedule of Quarterly Financial Information (Detail) - USD ($) $ / shares in Units, $ 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
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net premium income | $ 3,385 | $ 3,476 | $ 3,573 | $ 3,688 | $ 3,523 | $ 3,535 | $ 3,764 | $ 4,079 | $ 14,123 | [1] | $ 14,901 | [1] | $ 17,095 | [1]
Net investment income | 865 | 1,004 | 999 | 943 | 896 | 920 | 937 | 903 | 3,811 |  | 3,656 |  | 3,818 |
Net investment gains (losses) | (511) | 423 | 555 | 123 | (521) | 199 | 564 | 122 | 590 |  | 363 |  | 468 |
Other income (loss) | 38 | 47 | 45 | 46 | 50 | 50 | 50 | 69 | 177 |  | 220 |  | 173 |
Total revenues | 3,777 | 4,950 | 5,172 | 4,800 | 3,948 | 4,704 | 5,315 | 5,173 | 18,701 |  | 19,140 |  | 21,554 |
Total benefits and expenses | 3,488 | 3,145 | 3,347 | 3,458 | 3,410 | 3,375 | 3,607 | 3,879 | 13,439 |  | 14,271 |  | 16,346 |
Earnings before income taxes | 289 | 1,805 | 1,825 | 1,342 | 538 | 1,329 | 1,708 | 1,294 | 5,262 |  | 4,869 |  | 5,208 |
Income tax expense (benefit) | 21 | 236 | 191 | 154 | 342 | (452) | 314 | 247 | $ 603 |  | $ 451 |  | $ 977 |
Net earnings | $ 268 | $ 1,569 | $ 1,634 | $ 1,188 | $ 196 | $ 1,781 | $ 1,394 | $ 1,047 |  |  |  |  |  |
Basic (in dollars per share) | $ 0.46 | $ 2.65 | $ 2.72 | $ 1.94 | $ 0.32 | $ 2.83 | $ 2.18 | $ 1.61 | $ 7.81 |  | $ 6.96 |  | $ 6.28 |
Diluted (in dollars per share) | $ 0.46 | $ 2.64 | $ 2.71 | $ 1.94 | $ 0.31 | $ 2.82 | $ 2.17 | $ 1.60 | $ 7.78 |  | $ 6.93 |  | $ 6.25 |
[1] | Includes a gain (loss) of $20, $(42) and $(11) in 2023, 2022 and 2021, respectively, related to remeasurement of the deferred profit liability for limited-payment contracts.

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