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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 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Gross Unrealized Losses |  |
Less Than 12 Months | $ (2) | $ (22)
12 Months or Longer | (8) | (12)
Total | (10) | (34)
Estimated Fair Value |  |
Less Than 12 Months | 727 | 1,204
12 Months or Longer | 624 | 705
Total | 1,351 | 1,908
U.S. treasury securities |  |
Gross Unrealized Losses |  |
Less Than 12 Months | 0 | (2)
12 Months or Longer | (1) | (3)
Total | (1) | (5)
Estimated Fair Value |  |
Less Than 12 Months | 161 | 174
12 Months or Longer | 48 | 206
Total | 209 | 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 | 106 | 21
12 Months or Longer | 2 | 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 | 5 | 31
12 Months or Longer | 5 | 3
Total | 10 | 34
Corporate debt securities |  |
Gross Unrealized Losses |  |
Less Than 12 Months | (1) | (17)
12 Months or Longer | (7) | (8)
Total | (8) | (26)
Estimated Fair Value |  |
Less Than 12 Months | 333 | 774
12 Months or Longer | 546 | 439
Total | 878 | 1,213
Residential mortgage and asset-backed securities |  |
Gross Unrealized Losses |  |
Less Than 12 Months | 0 | (2)
12 Months or Longer | 0 | (1)
Total | 0 | (3)
Estimated Fair Value |  |
Less Than 12 Months | 123 | 205
12 Months or Longer | 24 | 56
Total | $ 147 | $ 261

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