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AVAILABLE-FOR-SALE DEBT SECURITIES - Summary of Available-for-Sale Debt Securities at Estimated Fair Value (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Available-for-Sale Debt Securities
Amortized Cost	$ 2,489	$ 2,023
Gross Unrealized Gains	1	3
Gross Unrealized Losses	(1)	0
Estimated Fair Value	2,489	2,026
U.S. treasury securities
Available-for-Sale Debt Securities
Amortized Cost	360	308
Gross Unrealized Gains	0	1
Gross Unrealized Losses	0	0
Estimated Fair Value	360	309
U.S. government agencies securities
Available-for-Sale Debt Securities
Amortized Cost	5	0
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	5	0
Non-U.S. government securities
Available-for-Sale Debt Securities
Amortized Cost	44	43
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	44	43
Certificates of deposit
Available-for-Sale Debt Securities
Amortized Cost	361	216
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	361	216
Corporate debt securities
Available-for-Sale Debt Securities
Amortized Cost	1,272	1,140
Gross Unrealized Gains	1	2
Gross Unrealized Losses	(1)	0
Estimated Fair Value	1,272	1,142
Residential mortgage and asset-backed securities
Available-for-Sale Debt Securities
Amortized Cost	447	316
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	$ 447	$ 316

X

- 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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
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Amount, before tax, of unrealized loss 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

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+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
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Amount excluding accrued interest, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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