SHAREHOLDERS' EQUITY - Changes in Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period	$ (7,278)	$ (8,451)	$ (6,429)	$ (8,411)
Other comprehensive income (loss) before reclassifications net of tax	(41)	1,556	(845)	1,573
Amounts reclassified from accumulated other comprehensive income net of tax	(19)	(85)	(64)	(142)
Other comprehensive income (loss), net of tax	(60)	1,471	(909)	1,431
Balance, end of period	(7,338)	(6,980)	(7,338)	(6,980)
Unrealized Foreign Currency Translation Gains (Losses)
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period	(3,618)	(2,438)	(3,564)	(1,985)
Other comprehensive income (loss) before reclassifications net of tax	(631)	(780)	(685)	(1,233)
Amounts reclassified from accumulated other comprehensive income net of tax	0	0	0	0
Other comprehensive income (loss), net of tax	(631)	(780)	(685)	(1,233)
Balance, end of period	(4,249)	(3,218)	(4,249)	(3,218)
Unrealized Gains (Losses) on Fixed Maturity Securities
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period	1,289	5,787	(702)	9,602
Other comprehensive income (loss) before reclassifications net of tax	710	(2,767)	2,746	(6,520)
Amounts reclassified from accumulated other comprehensive income net of tax	(21)	(90)	(66)	(152)
Other comprehensive income (loss), net of tax	689	(2,857)	2,680	(6,672)
Balance, end of period	1,978	2,930	1,978	2,930
Unrealized Gains (Losses) on Derivatives
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period	(26)	(29)	(27)	(30)
Other comprehensive income (loss) before reclassifications net of tax	0	(1)	1	0
Amounts reclassified from accumulated other comprehensive income net of tax	1	1	1	1
Other comprehensive income (loss), net of tax	1	0	2	1
Balance, end of period	(25)	(29)	(25)	(29)
Effect of Changes in Discount Rate Assumptions
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period	(4,894)	(11,608)	(2,100)	(15,832)
Other comprehensive income (loss) before reclassifications net of tax	(165)	5,105	(2,959)	9,329
Amounts reclassified from accumulated other comprehensive income net of tax	0	0	0	0
Other comprehensive income (loss), net of tax	(165)	5,105	(2,959)	9,329
Balance, end of period	(5,059)	(6,503)	(5,059)	(6,503)
Pension Liability Adjustment
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period	(29)	(163)	(36)	(166)
Other comprehensive income (loss) before reclassifications net of tax	45	(1)	52	(3)
Amounts reclassified from accumulated other comprehensive income net of tax	1	4	1	9
Other comprehensive income (loss), net of tax	46	3	53	6
Balance, end of period	$ 17	$ (160)	$ 17	$ (160)