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AVAILABLE-FOR-SALE DEBT SECURITIES AND EQUITY SECURITIES - Summary of Available-for-Sale Debt Securities In Continuous Unrealized Loss Position (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Gross Unrealized Losses    
Less than 12 months $ (7) $ (22)
12 months or longer (14) (12)
Total (21) (34)
Estimated Fair Value    
Less than 12 months 1,238 1,204
12 months or longer 761 705
Total 2,000 1,908
U.S. treasury securities    
Gross Unrealized Losses    
Less than 12 months (1) (2)
12 months or longer (1) (3)
Total (3) (5)
Estimated Fair Value    
Less than 12 months 261 174
12 months or longer 71 206
Total 332 379
U.S. government agencies securities    
Gross Unrealized Losses    
Less than 12 months (1) 0
12 months or longer 0 0
Total (1) 0
Estimated Fair Value    
Less than 12 months 150 21
12 months or longer 2 0
Total 152 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 5 31
12 months or longer 5 3
Total 10 34
Corporate debt securities    
Gross Unrealized Losses    
Less than 12 months (4) (17)
12 months or longer (13) (8)
Total (17) (26)
Estimated Fair Value    
Less than 12 months 549 774
12 months or longer 642 439
Total 1,191 1,213
Residential mortgage and asset-backed securities    
Gross Unrealized Losses    
Less than 12 months (1) (2)
12 months or longer 0 (1)
Total (1) (3)
Estimated Fair Value    
Less than 12 months 273 205
12 months or longer 42 56
Total $ 315 $ 261