AVAILABLE-FOR-SALE DEBT SECURITIES AND EQUITY SECURITIES - Summary of Available-for-Sale Debt Securities In Continuous Unrealized Loss Position (Details) $ in Millions	Dec. 31, 2023 USD ($)
Gross Unrealized Losses
Less than 12 months	$ (2)
12 months or longer	(8)
Total	(10)
Estimated Fair Value
Less than 12 months	727
12 months or longer	624
Total	1,351
U.S. treasury securities
Gross Unrealized Losses
Less than 12 months	0
12 months or longer	(1)
Total	(1)
Estimated Fair Value
Less than 12 months	161
12 months or longer	48
Total	209
U.S. government agencies securities
Gross Unrealized Losses
Less than 12 months	0
12 months or longer	0
Total	0
Estimated Fair Value
Less than 12 months	106
12 months or longer	2
Total	108
Non-U.S. government securities
Gross Unrealized Losses
Less than 12 months	0
12 months or longer	0
Total	0
Estimated Fair Value
Less than 12 months	5
12 months or longer	5
Total	10
Corporate debt securities
Gross Unrealized Losses
Less than 12 months	(1)
12 months or longer	(7)
Total	(8)
Estimated Fair Value
Less than 12 months	333
12 months or longer	546
Total	878
Residential mortgage and asset-backed securities
Gross Unrealized Losses
Less than 12 months	0
12 months or longer	0
Total	0
Estimated Fair Value
Less than 12 months	123
12 months or longer	24
Total	$ 147