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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

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