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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
Jun. 30, 2023
Dec. 31, 2022
Gross Unrealized Losses    
Less than 12 months $ (10) $ (22)
12 months or longer (16) (12)
Total (26) (34)
Estimated Fair Value    
Less than 12 months 1,246 1,204
12 months or longer 739 705
Total 1,985 1,908
U.S. treasury securities    
Gross Unrealized Losses    
Less than 12 months (2) (2)
12 months or longer (1) (3)
Total (3) (5)
Estimated Fair Value    
Less than 12 months 299 174
12 months or longer 46 206
Total 345 379
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 149 21
12 months or longer 0 0
Total 149 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 11 31
12 months or longer 5 3
Total 15 34
Corporate debt securities    
Gross Unrealized Losses    
Less than 12 months (6) (17)
12 months or longer (14) (8)
Total (20) (26)
Estimated Fair Value    
Less than 12 months 522 774
12 months or longer 647 439
Total 1,168 1,213
Residential mortgage and asset-backed securities    
Gross Unrealized Losses    
Less than 12 months (1) (2)
12 months or longer 0 (1)
Total (2) (3)
Estimated Fair Value    
Less than 12 months 266 205
12 months or longer 42 56
Total $ 308 $ 261