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SHAREHOLDERS' EQUITY - Reclassifications Out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |
Net investment gains (losses) |  | $ 423 |  |  | $ 199 |  |  | $ 1,101 | $ 885
Net investment income |  | 1,004 |  |  | 920 |  |  | 2,946 | 2,760
Acquisition and operating expenses |  | (1,285) |  |  | (1,299) |  |  | (3,843) | (4,028)
Income tax (expense) or benefit |  | (236) |  |  | 452 |  |  | (581) | (109)
Net of tax |  | $ 1,569 | $ 1,634 | $ 1,188 | $ 1,781 | $ 1,394 | $ 1,047 | $ 4,391 | $ 4,222
U.S. federal statutory income tax rate |  | 21.00% |  |  | 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 |  | $ 31 |  |  | $ 39 |  |  | $ 95 | $ 183
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) |  | 41 |  |  | 58 |  |  | 125 | 252
Income tax (expense) or benefit | [1] | (9) |  |  | (12) |  |  | (26) | (53)
Net of tax |  | 32 |  |  | 46 |  |  | 99 | 199
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) |  | (1) |  |  | (1) |  |  | (3) | (3)
Net investment income |  |  |  |  |  |  |  | (1) |
Earnings before income taxes |  |  |  |  |  |  |  | (4) |
Income tax (expense) or benefit | [1] | 0 |  |  | 0 |  |  | 1 | 1
Net of tax |  | (1) |  |  | (1) |  |  | (3) | (2)
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 |  |  | (7) |  |  | (1) | (18)
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 | 0
Reclassification Out Of Accumulated Other Comprehensive Income | Pension Liability Adjustment |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |
Income tax (expense) or benefit | [1] | 0 |  |  | 1 |  |  | 0 | 4
Net of tax |  | $ 0 |  |  | $ (6) |  |  | $ (1) | $ (14)
[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 12 for additional details).

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