AVAILABLE-FOR-SALE DEBT SECURITIES AND EQUITY SECURITIES - Summary of Available-for-Sale Debt Securities In Continuous Unrealized Loss Position (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Gross Unrealized Losses
Less than 12 months	$ (8)	$ (22)
12 months or longer	(18)	(12)
Total	(26)	(34)
Estimated Fair Value
Less than 12 months	862	1,204
12 months or longer	880	705
Total	1,743	1,908
U.S. treasury securities
Gross Unrealized Losses
Less than 12 months	(1)	(2)
12 months or longer	(2)	(3)
Total	(2)	(5)
Estimated Fair Value
Less than 12 months	89	174
12 months or longer	177	206
Total	266	379
U.S. government agencies securities
Gross Unrealized Losses
Less than 12 months	0	0
12 months or longer	0	0
Total	0	0
Estimated Fair Value
Less than 12 months	108	21
12 months or longer	0	0
Total	108	21
Non-U.S. government securities
Gross Unrealized Losses
Less than 12 months	0	0
12 months or longer	0	0
Total	0	0
Estimated Fair Value
Less than 12 months	23	31
12 months or longer	0	3
Total	23	34
Corporate debt securities
Gross Unrealized Losses
Less than 12 months	(6)	(17)
12 months or longer	(16)	(8)
Total	(21)	(26)
Estimated Fair Value
Less than 12 months	451	774
12 months or longer	651	439
Total	1,102	1,213
Residential mortgage and asset-backed securities
Gross Unrealized Losses
Less than 12 months	(1)	(2)
12 months or longer	(1)	(1)
Total	(2)	(3)
Estimated Fair Value
Less than 12 months	192	205
12 months or longer	53	56
Total	$ 245	$ 261