Investments - Available-For-Sale Securities (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Investments
Estimated Fair Value	$ 2,764
Short-term investments:
Investments
Gross Amortized Cost	1,757	$ 2,552
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(14)	(19)
Estimated Fair Value	1,743	2,533
Short-term investments: \| Corporate debt securities
Investments
Gross Amortized Cost	1,276	2,170
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(6)	(8)
Estimated Fair Value	1,270	2,162
Short-term investments: \| Government and agency securities
Investments
Gross Amortized Cost	481	382
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(8)	(11)
Estimated Fair Value	473	371
Long-term investments:
Investments
Gross Amortized Cost	1,044	625
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(23)	(26)
Estimated Fair Value	1,021	599
Long-term investments: \| Corporate debt securities
Investments
Gross Amortized Cost	582	338
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(7)	(10)
Estimated Fair Value	575	328
Long-term investments: \| Government and agency securities
Investments
Gross Amortized Cost	462	287
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(16)	(16)
Estimated Fair Value	$ 446	$ 271

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).

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

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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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-2

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Amortized cost 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/2003/role/disclosureRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(1))
-Publisher FASB
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-Section 50
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-2

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
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-Publisher FASB
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Amount 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/2003/role/disclosureRef
-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 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
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-Paragraph 1
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481830/320-10-45-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
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-Publisher FASB
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-Topic 326
-SubTopic 30
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-Section 45
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