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SHAREHOLDERS' EQUITY - Reclassifications Out of Accumulated Other Comprehensive 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
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net investment gains (losses) |  | $ (511) | $ 423 | $ 555 | $ 123 | $ (521) | $ 199 | $ 564 | $ 122 | $ 590 | $ 363 | $ 468
Net investment income |  | 865 | 1,004 | 999 | 943 | 896 | 920 | 937 | 903 | 3,811 | 3,656 | 3,818
Earnings before income taxes |  | 289 | 1,805 | 1,825 | 1,342 | 538 | 1,329 | 1,708 | 1,294 | 5,262 | 4,869 | 5,208
Acquisition and operating expenses |  |  |  |  |  |  |  |  |  | (5,228) | (5,384) | (5,870)
Income tax (expense) benefit |  | $ (21) | $ (236) | $ (191) | $ (154) | $ (342) | $ 452 | $ (314) | $ (247) | (603) | (451) | (977)
Net of tax |  |  |  |  |  |  |  |  |  | $ 4,659 | $ 4,418 | $ 4,231
U.S. federal statutory corporate income tax rate |  |  |  |  |  |  |  |  |  | 21.00% | 21.00% | 21.00%
Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net of tax |  |  |  |  |  |  |  |  |  | $ 127 | $ 335 | $ (9)
Reclassification out of Accumulated Other Comprehensive Income | Unrealized gains (losses) on available-for-sale securities |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net investment gains (losses) |  |  |  |  |  |  |  |  |  | 166 | 453 | 31
Income tax (expense) benefit | [1] |  |  |  |  |  |  |  |  | (35) | (95) | (7)
Net of tax |  |  |  |  |  |  |  |  |  | 131 | 358 | 24
Reclassification out of Accumulated Other Comprehensive Income | Unrealized Gains (Losses) on Derivatives |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net investment gains (losses) |  |  |  |  |  |  |  |  |  | (4) | (4) | (5)
Net investment income |  |  |  |  |  |  |  |  |  | (1) | (1) | (1)
Earnings before income taxes |  |  |  |  |  |  |  |  |  | (5) | (5) | (6)
Income tax (expense) benefit | [1] |  |  |  |  |  |  |  |  | 1 | 1 | 1
Net of tax |  |  |  |  |  |  |  |  |  | (4) | (4) | (5)
Reclassification out of Accumulated Other Comprehensive Income | Pension liability adjustment, actuarial gains (losses) |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Acquisition and operating expenses | [2] |  |  |  |  |  |  |  |  | 0 | (24) | (35)
Reclassification out of Accumulated Other Comprehensive Income | Pension liability adjustment, prior service (cost) credit |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Acquisition and operating expenses | [2] |  |  |  |  |  |  |  |  | 0 | 0 | 0
Reclassification out of Accumulated Other Comprehensive Income | Pension Liability Adjustment |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Income tax (expense) benefit | [1] |  |  |  |  |  |  |  |  | 0 | 5 | 7
Net of tax |  |  |  |  |  |  |  |  |  | $ 0 | $ (19) | $ (28)
[1] | Based on 21% tax rate
[2] | These accumulated other comprehensive income components are included in the computation of net periodic benefit cost (see Note 14 for additional details).

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