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SHAREHOLDERS' EQUITY - Changes in Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |
Balance, beginning of period | $ (7,338) | $ (6,980) | $ (6,429) | $ (8,411)
Other comprehensive income (loss) before reclassifications net of tax | 1,609 | (486) | 764 | 1,089
Amounts reclassified from accumulated other comprehensive income (loss) net of tax | (31) | (39) | (95) | (183)
Other comprehensive income (loss), net of tax | 1,578 | (525) | 669 | 906
Balance, end of period | (5,760) | (7,505) | (5,760) | (7,505)
Unrealized Foreign Currency Translation Gains (Losses) |  |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |
Balance, beginning of period | (4,249) | (3,218) | (3,564) | (1,985)
Other comprehensive income (loss) before reclassifications net of tax | (235) | (1,156) | (920) | (2,389)
Amounts reclassified from accumulated other comprehensive income (loss) net of tax | 0 | 0 | 0 | 0
Other comprehensive income (loss), net of tax | (235) | (1,156) | (920) | (2,389)
Balance, end of period | (4,484) | (4,374) | (4,484) | (4,374)
Unrealized Gains (Losses) on Fixed Maturity Securities |  |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |
Balance, beginning of period | 1,978 | 2,930 | (702) | 9,602
Other comprehensive income (loss) before reclassifications net of tax | (2,349) | (1,753) | 398 | (8,272)
Amounts reclassified from accumulated other comprehensive income (loss) net of tax | (32) | (46) | (99) | (199)
Other comprehensive income (loss), net of tax | (2,381) | (1,799) | 299 | (8,471)
Balance, end of period | (403) | 1,131 | (403) | 1,131
Unrealized Gains (Losses) on Derivatives |  |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |
Balance, beginning of period | (25) | (29) | (27) | (30)
Other comprehensive income (loss) before reclassifications net of tax | 0 | (1) | 0 | (1)
Amounts reclassified from accumulated other comprehensive income (loss) net of tax | 1 | 1 | 3 | 2
Other comprehensive income (loss), net of tax | 1 | 0 | 3 | 1
Balance, end of period | (24) | (29) | (24) | (29)
Effect of Changes in Discount Rate Assumptions |  |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |
Balance, beginning of period | (5,059) | (6,503) | (2,100) | (15,832)
Other comprehensive income (loss) before reclassifications net of tax | 4,193 | 2,428 | 1,234 | 11,757
Amounts reclassified from accumulated other comprehensive income (loss) net of tax | 0 | 0 | 0 | 0
Other comprehensive income (loss), net of tax | 4,193 | 2,428 | 1,234 | 11,757
Balance, end of period | (866) | (4,075) | (866) | (4,075)
Pension Liability Adjustment |  |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |
Balance, beginning of period | 17 | (160) | (36) | (166)
Other comprehensive income (loss) before reclassifications net of tax | 0 | (4) | 52 | (6)
Amounts reclassified from accumulated other comprehensive income (loss) net of tax | 0 | 6 | 1 | 14
Other comprehensive income (loss), net of tax | 0 | 2 | 53 | 8
Balance, end of period | $ 17 | $ (158) | $ 17 | $ (158)

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