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AVAILABLE-FOR-SALE DEBT SECURITIES AND EQUITY SECURITIES - Summary of Available-for-Sale Debt Securities at Estimated Fair Value (Details) - USD ($) $ in Millions | Jun. 30, 2023 | Dec. 31, 2022
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Available-for-Sale Debt Securities |  |
Amortized Cost | $ 2,367 | $ 2,325
Gross Unrealized Gains | 0 | 1
Gross Unrealized Losses | (26) | (34)
Estimated Fair Value | 2,341 | 2,293
U.S. treasury securities |  |
Available-for-Sale Debt Securities |  |
Amortized Cost | 378 | 415
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (3) | (5)
Estimated Fair Value | 375 | 410
U.S. government agencies securities |  |
Available-for-Sale Debt Securities |  |
Amortized Cost | 162 | 36
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (1) | 0
Estimated Fair Value | 161 | 35
Non-U.S. government securities |  |
Available-for-Sale Debt Securities |  |
Amortized Cost | 16 | 34
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 15 | 34
Certificates of deposit |  |
Available-for-Sale Debt Securities |  |
Amortized Cost | 104 | 54
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 104 | 54
Corporate debt securities |  |
Available-for-Sale Debt Securities |  |
Amortized Cost | 1,358 | 1,452
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (20) | (26)
Estimated Fair Value | 1,338 | 1,427
Residential mortgage and asset-backed securities |  |
Available-for-Sale Debt Securities |  |
Amortized Cost | 348 | 335
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (2) | (3)
Estimated Fair Value | $ 346 | $ 333

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 + Details
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