REINSURANCE - Effect of Reinsurance on Premiums and Benefits and Claims (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2025	Mar. 31, 2024
Reinsurance Disclosures [Abstract]
Earned premiums, direct		$ 3,433	$ 3,482
Earned premiums, ceded		(88)	(69)
Earned premiums, assumed		36	43
Net earned premiums	[1]	3,381	3,456
Benefits and claims, excluding reserve remeasurement, direct		2,031	2,082
Benefits and claims, excluding reserve remeasurement, ceded		(56)	(33)
Benefits and claims, excluding reserve remeasurement, assumed		11	17
Benefits and claims, excluding reserve remeasurement		1,986	2,066
Reserve remeasurement (gains) losses, direct		(41)	(57)
Reserve remeasurement (gains) losses, ceded		0	1
Reserve remeasurement (gains) losses		41	56
Total benefits and claims, net		$ 1,945	$ 2,010

[1] Includes a gain (loss) of an immaterial amount and $(3) for the three-month periods ended March 31, 2025 and 2024, respectively, related to remeasurement of the deferred profit liability for limited-payment contracts.