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SHAREHOLDERS' EQUITY - Changes in Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Accumulated Other Comprehensive Income [Roll Forward] |  |  |
Balance, beginning of period | $ (6,429) | $ (8,411) | $ 8,934
Other comprehensive income loss before reclassifications net of tax | 1,036 | 2,317 | 1,216
Amounts reclassified from accumulated other comprehensive income (loss) net of tax | (127) | (335) | 9
Other comprehensive income (loss), net of tax | 909 | 1,982 | 1,225
Balance, end of period | (5,520) | (6,429) | (8,411)
Accounting Standards Update 2018-12 | Cumulative effect, period of adoption, adjustment |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |
Balance, beginning of period |  |  | (18,570)
Accounting Standards Update 2018-12 | Cumulative effect, period of adoption, adjusted balance |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |
Balance, beginning of period |  |  | (9,636)
Unrealized Foreign Currency Translation Gains (Losses) |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |
Balance, beginning of period | (3,564) | (1,985) | (1,109)
Other comprehensive income loss before reclassifications net of tax | (505) | (1,579) | (876)
Amounts reclassified from accumulated other comprehensive income (loss) net of tax | 0 | 0 | 0
Other comprehensive income (loss), net of tax | (505) | (1,579) | (876)
Balance, end of period | (4,069) | (3,564) | (1,985)
Unrealized Foreign Currency Translation Gains (Losses) | Accounting Standards Update 2018-12 | Cumulative effect, period of adoption, adjustment |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |
Balance, beginning of period |  |  | 0
Unrealized Foreign Currency Translation Gains (Losses) | Accounting Standards Update 2018-12 | Cumulative effect, period of adoption, adjusted balance |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |
Balance, beginning of period |  |  | (1,109)
Unrealized Gains (Losses) on Fixed Maturity Securities |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |
Balance, beginning of period | (702) | 9,602 | 10,361
Other comprehensive income loss before reclassifications net of tax | 1,972 | (9,946) | (735)
Amounts reclassified from accumulated other comprehensive income (loss) net of tax | (131) | (358) | (24)
Other comprehensive income (loss), net of tax | 1,841 | (10,304) | (759)
Balance, end of period | 1,139 | (702) | 9,602
Unrealized Gains (Losses) on Fixed Maturity Securities | Accounting Standards Update 2018-12 | Cumulative effect, period of adoption, adjustment |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |
Balance, beginning of period |  |  | 0
Unrealized Gains (Losses) on Fixed Maturity Securities | Accounting Standards Update 2018-12 | Cumulative effect, period of adoption, adjusted balance |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |
Balance, beginning of period |  |  | 10,361
Unrealized Gains (Losses) on Derivatives |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |
Balance, beginning of period | (27) | (30) | (34)
Other comprehensive income loss before reclassifications net of tax | 1 | (1) | (1)
Amounts reclassified from accumulated other comprehensive income (loss) net of tax | 4 | 4 | 5
Other comprehensive income (loss), net of tax | 5 | 3 | 4
Balance, end of period | (22) | (27) | (30)
Unrealized Gains (Losses) on Derivatives | Accounting Standards Update 2018-12 | Cumulative effect, period of adoption, adjustment |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |
Balance, beginning of period |  |  | 0
Unrealized Gains (Losses) on Derivatives | Accounting Standards Update 2018-12 | Cumulative effect, period of adoption, adjusted balance |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |
Balance, beginning of period |  |  | (34)
Effect of Changes in Discount Rate Assumptions |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |
Balance, beginning of period | (2,100) | (15,832) | 0
Other comprehensive income loss before reclassifications net of tax | (460) | 13,732 | 2,738
Amounts reclassified from accumulated other comprehensive income (loss) net of tax | 0 | 0 | 0
Other comprehensive income (loss), net of tax | (460) | 13,732 | 2,738
Balance, end of period | (2,560) | (2,100) | (15,832)
Effect of Changes in Discount Rate Assumptions | Accounting Standards Update 2018-12 | Cumulative effect, period of adoption, adjustment |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |
Balance, beginning of period |  |  | (18,570)
Effect of Changes in Discount Rate Assumptions | Accounting Standards Update 2018-12 | Cumulative effect, period of adoption, adjusted balance |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |
Balance, beginning of period |  |  | (18,570)
Pension Liability Adjustment |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |
Balance, beginning of period | (36) | (166) | (284)
Other comprehensive income loss before reclassifications net of tax | 28 | 111 | 90
Amounts reclassified from accumulated other comprehensive income (loss) net of tax | 0 | 19 | 28
Other comprehensive income (loss), net of tax | 28 | 130 | 118
Balance, end of period | $ (8) | $ (36) | (166)
Pension Liability Adjustment | Accounting Standards Update 2018-12 | Cumulative effect, period of adoption, adjustment |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |
Balance, beginning of period |  |  | 0
Pension Liability Adjustment | Accounting Standards Update 2018-12 | Cumulative effect, period of adoption, adjusted balance |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |
Balance, beginning of period |  |  | $ (284)

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