SHAREHOLDERS' EQUITY - Changes in Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period	$ 27,200	$ 26,047	$ 26,098	$ 21,985
Other comprehensive income (loss), net of tax	1,144	(385)	3,631	1,843
Balance, end of period	28,688	24,830	28,688	24,830
Unrealized Foreign Currency Translation Gains (Losses)
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period	(4,282)	(5,091)	(4,998)	(4,069)
Other comprehensive income (loss) before reclassifications net of tax	(222)	952	494	(70)
Amounts reclassified from accumulated other comprehensive income (loss) net of tax	0	0	0	0
Other comprehensive income (loss), net of tax	(222)	952	494	(70)
Balance, end of period	(4,504)	(4,139)	(4,504)	(4,139)
Unrealized Gains (Losses) on Fixed Maturity Securities
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period	(1,828)	401	24	1,139
Other comprehensive income (loss) before reclassifications net of tax	152	198	(1,679)	(368)
Amounts reclassified from accumulated other comprehensive income (loss) net of tax	(25)	(42)	(46)	(214)
Other comprehensive income (loss), net of tax	127	156	(1,725)	(582)
Balance, end of period	(1,701)	557	(1,701)	557
Unrealized Gains (Losses) on Derivatives
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period	(17)	(22)	(20)	(22)
Other comprehensive income (loss) before reclassifications net of tax	0	1	2	0
Amounts reclassified from accumulated other comprehensive income (loss) net of tax	1	1	2	2
Other comprehensive income (loss), net of tax	1	2	4	2
Balance, end of period	(16)	(20)	(16)	(20)
Effect of Changes in Discount Rate Assumptions
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period	5,594	1,425	2,006	(2,560)
Other comprehensive income (loss) before reclassifications net of tax	1,238	(1,492)	4,826	2,493
Amounts reclassified from accumulated other comprehensive income (loss) net of tax	0	0	0	0
Other comprehensive income (loss), net of tax	1,238	(1,492)	4,826	2,493
Balance, end of period	6,832	(67)	6,832	(67)
Pension Liability Adjustment
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period	42	(5)	10	(8)
Other comprehensive income (loss) before reclassifications net of tax	0	(3)	32	1
Amounts reclassified from accumulated other comprehensive income (loss) net of tax	0	0	0	(1)
Other comprehensive income (loss), net of tax	0	(3)	32	0
Balance, end of period	42	(8)	42	(8)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period	(491)	(3,292)	(2,978)	(5,520)
Other comprehensive income (loss) before reclassifications net of tax	1,168	(344)	3,675	2,056
Amounts reclassified from accumulated other comprehensive income (loss) net of tax	(24)	(41)	(44)	(213)
Other comprehensive income (loss), net of tax	1,144	(385)	3,631	1,843
Balance, end of period	$ 653	$ (3,677)	$ 653	$ (3,677)