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SHAREHOLDERS' EQUITY - Changes in Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Accumulated Other Comprehensive Income [Roll Forward] |  |
Balance, beginning of period | $ (5,520) | $ (6,429)
Other comprehensive income (loss) before reclassifications net of tax | 550 | (805)
Amounts reclassified from accumulated other comprehensive income (loss) net of tax | (132) | (44)
Other comprehensive income (loss), net of tax | 418 | (849)
Balance, end of period | (5,102) | (7,278)
Unrealized Foreign Currency Translation Gains (Losses) |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |
Balance, beginning of period | (4,069) | (3,564)
Other comprehensive income (loss) before reclassifications net of tax | (597) | (54)
Amounts reclassified from accumulated other comprehensive income (loss) net of tax | 0 | 0
Other comprehensive income (loss), net of tax | (597) | (54)
Balance, end of period | (4,666) | (3,618)
Unrealized Gains (Losses) on Fixed Maturity Securities |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |
Balance, beginning of period | 1,139 | (702)
Other comprehensive income (loss) before reclassifications net of tax | 86 | 2,036
Amounts reclassified from accumulated other comprehensive income (loss) net of tax | (133) | (45)
Other comprehensive income (loss), net of tax | (47) | 1,991
Balance, end of period | 1,092 | 1,289
Unrealized Gains (Losses) on Derivatives |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |
Balance, beginning of period | (22) | (27)
Other comprehensive income (loss) before reclassifications net of tax | (5) | 0
Amounts reclassified from accumulated other comprehensive income (loss) net of tax | 1 | 1
Other comprehensive income (loss), net of tax | (4) | 1
Balance, end of period | (26) | (26)
Effect of Changes in Discount Rate Assumptions |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |
Balance, beginning of period | (2,560) | (2,100)
Other comprehensive income (loss) before reclassifications net of tax | 1,065 | (2,794)
Amounts reclassified from accumulated other comprehensive income (loss) net of tax | 0 | 0
Other comprehensive income (loss), net of tax | 1,065 | (2,794)
Balance, end of period | (1,495) | (4,894)
Pension Liability Adjustment |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |
Balance, beginning of period | (8) | (36)
Other comprehensive income (loss) before reclassifications net of tax | 1 | 7
Amounts reclassified from accumulated other comprehensive income (loss) net of tax | 0 | 0
Other comprehensive income (loss), net of tax | 1 | 7
Balance, end of period | $ (7) | $ (29)

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