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)