SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Impact from Adoption on Statement of Earnings (Details 2) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022		Dec. 31, 2021		Dec. 31, 2020
Benefits and claims, net	$ (9,153)		$ (10,576)		$ (11,796)
Net earned premiums, principally supplemental health insurance	(15,263)		(17,647)		$ (18,622)
Accounting Standards Update 2018-12 | Pro Forma
Benefits and claims, net	(8,887)		(10,476)
Net earned premiums, principally supplemental health insurance	(14,901)	[1]	(17,095)	[2]
Accounting Standards Update 2018-12 | Revision of Prior Period, Accounting Standards Update, Adjustment | Pro Forma
Increase in deferred profit liability	324		489
Benefits and claims, net	38		63
Net earned premiums, principally supplemental health insurance	$ 38		$ 63

[1] Adjustment reflects a $324 increase in the deferred profit liability on limited-payment products under the updated standard combined with the reclassification of a $38 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.

[2] 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.