SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Impact from Adoption on Statement of Earnings (Details 2) - USD ($) $ in Millions		3 Months Ended		9 Months Ended		12 Months Ended
		Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Policyholder Benefits and Claims Incurred, Net		$ (2,340)	$ (2,609)	$ (7,125)	$ (7,996)
Net earned premiums, principally supplemental health insurance		$ (3,651)	$ (4,372)	$ (11,679)	$ (13,406)
Accounting Standards Update 2018-12 | Pro Forma
Policyholder Benefits and Claims Incurred, Net						$ (10,476)
Net earned premiums, principally supplemental health insurance	[1]					(17,095)
Accounting Standards Update 2018-12 | Revision of Prior Period, Accounting Standards Update, Adjustment | Pro Forma
Increase in deferred profit liability						489
Policyholder Benefits and Claims Incurred, Net						63
Net earned premiums, principally supplemental health insurance						$ 63

[1] Adjustment reflects a $489 increase in the deferred profit liability on limited-payment products under the updated standard combined with the reclassification of a $63 increase in deferred profit liability previously reported in benefits and claims and reclassified to net earned premiums in conjunction with adoption of the updated standard.