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INVESTMENTS (Tables)

12 Months Ended

Dec. 31, 2024

Investments, Debt and Equity Securities [Abstract]

Schedule of Financial Instruments by Significant Categories and Fair Value Measurement on a Recurring Basis

The following tables summarize our financial instruments by significant categories and fair value measurement on a recurring basis as of December 31, 2024 and December 31, 2023 and the amortized cost, gross unrealized gains, gross unrealized losses, and fair value of our AFS investments:

(in millions)			Fair Value Level			Amortized Cost			Gross Unrealized Gains			Gross Unrealized Losses			Fair Value			Cash and Cash Equivalents			Investments			Restricted Cash, Cash Equivalents and Investments
December 31, 2024
Cash equivalents:
Money market mutual funds			Level 1			$	570		$	—		$	—		$	570		$	257		$	—		$	313
U.S. treasuries			Level 2			1			—			—			1			—			—			1
Total cash equivalents						571			—			—			571			257			—			314
AFS Investments:
Asset-backed securities			Level 2			—			—			—			—			—			—			—
Corporate bonds			Level 2			35			—			—			35			—			—			35
Agency securities			Level 2			18			—			(1)			17			—			—			17
U.S. treasuries			Level 2			176			—			(2)			174			—			—			174
Certificate of deposit			Level 2			1			—			—			1			—			—			1
Other debt securities			Level 2			—			—			—			—			—			—			—
Total AFS Investments						$	230		$	—		$	(3)		$	227		$	—		$	—		$	227

(in millions)			Fair Value Level			Amortized Cost			Gross Unrealized Gains			Gross Unrealized Losses			Fair Value			Cash and Cash Equivalents			Investments			Restricted Cash, Cash Equivalents and Investments
December 31, 2023
Cash equivalents:
Money market mutual funds			Level 1			$	183		$	—		$	—		$	183		$	96		$	—		$	87
U.S. treasuries			Level 2			7			—			—			7			5			—			2
Total cash equivalents						190			—			—			190			101			—			89
AFS Investments:
Asset-backed securities			Level 2			41			—			(1)			40			—			40			—
Corporate bonds			Level 2			135			1			—			136			—			103			33
Agency securities			Level 2			40			—			(1)			39			—			10			29
U.S. treasuries			Level 2			231			1			(1)			231			—			47			184
Certificate of deposit			Level 2			2			—			—			2			—			—			2
Other debt securities			Level 2			8			—			—			8			—			8			—
Total AFS Investments						$	457		$	2		$	(3)		$	456		$	—		$	208		$	248

Schedule of Fair Value of Debt Investments by Contractual Maturity

The fair value of debt investments by contractual maturity are shown below:

(in millions)						December 31, 2024
One year or less						$	21
Over one year through five years						199
Over five years through ten years						5
Over ten years						2
Total fair value						$	227

Schedule of Proceeds from Available-for-sale Securities

The gross proceeds from sales and maturities of AFS securities for the years ended December 31, 2024, 2023, and 2022 are presented below.

			Year Ended December 31,
(in millions)			2024			2023			2022
Gross realized gains			$	2		$	—		$	—
Gross realized losses			(1)			(1)			(18)
Gross proceeds from sales			287			150			227
Gross proceeds from maturities			135			137			253
Total			$	423		$	286		$	462

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- Definition

Tabular disclosure of 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/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-9

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-3

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
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-Name Accounting Standards Codification
-Section 50
-Paragraph 2
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-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
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-Section 50
-Paragraph 2
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (aa)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (aaa)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

Reference 8: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
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-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

Reference 9: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-3

Reference 10: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
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-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-3

Reference 11: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-3

Reference 12: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-3

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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
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