SHAREHOLDERS' EQUITY - Changes in Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period	$ 26,098	$ 21,985
Other comprehensive income (loss), net of tax	1,119	418
Balance, end of period	26,338	23,537
Unrealized Foreign Currency Translation Gains (Losses)
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period	(4,998)	(4,069)
Other comprehensive income (loss) before reclassifications net of tax	449	(597)
Amounts reclassified from accumulated other comprehensive income (loss) net of tax	0	0
Other comprehensive income (loss), net of tax	449	(597)
Balance, end of period	(4,549)	(4,666)
Unrealized Gains (Losses) on Fixed Maturity Securities
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period	24	1,139
Other comprehensive income (loss) before reclassifications net of tax	(1,225)	86
Amounts reclassified from accumulated other comprehensive income (loss) net of tax	(32)	(133)
Other comprehensive income (loss), net of tax	(1,257)	(47)
Balance, end of period	(1,233)	1,092
Unrealized Gains (Losses) on Derivatives
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period	(20)	(22)
Other comprehensive income (loss) before reclassifications net of tax	1	(5)
Amounts reclassified from accumulated other comprehensive income (loss) net of tax	1	1
Other comprehensive income (loss), net of tax	2	(4)
Balance, end of period	(18)	(26)
Effect of Changes in Discount Rate Assumptions
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period	2,006	(2,560)
Other comprehensive income (loss) before reclassifications net of tax	1,893	1,065
Amounts reclassified from accumulated other comprehensive income (loss) net of tax	0	0
Other comprehensive income (loss), net of tax	1,893	1,065
Balance, end of period	3,899	(1,495)
Pension Liability Adjustment
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period	10	(8)
Other comprehensive income (loss) before reclassifications net of tax	33	1
Amounts reclassified from accumulated other comprehensive income (loss) net of tax	(1)	0
Other comprehensive income (loss), net of tax	32	1
Balance, end of period	42	(7)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income [Roll Forward]
Balance, beginning of period	(2,978)	(5,520)
Other comprehensive income (loss) before reclassifications net of tax	1,151	550
Amounts reclassified from accumulated other comprehensive income (loss) net of tax	(32)	(132)
Other comprehensive income (loss), net of tax	1,119	418
Balance, end of period	$ (1,859)	$ (5,102)