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Fair Value Measurements - Financial Instruments on a Recurring Basis (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	$ 4,259	$ 3,499
Total assets	4,259	3,499
Contingent consideration liabilities		8
Total liabilities		8
Corporate debt securities
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	2,732	2,184
Mortgage-backed securities
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	911	731
Asset-backed securities
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	365	288
Municipal securities
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	166	149
U.S. Treasury notes
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	40	105
Other
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	45	42
Level 1
Fair value of assets measured on recurring basis
Total assets	0	0
Contingent consideration liabilities		0
Total liabilities		0
Level 1 | Corporate debt securities
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	0	0
Level 1 | Mortgage-backed securities
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	0	0
Level 1 | Asset-backed securities
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	0	0
Level 1 | Municipal securities
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	0	0
Level 1 | U.S. Treasury notes
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	0	0
Level 1 | Other
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	0	0
Level 2
Fair value of assets measured on recurring basis
Total assets	4,259	3,499
Contingent consideration liabilities		0
Total liabilities		0
Level 2 | Corporate debt securities
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	2,732	2,184
Level 2 | Mortgage-backed securities
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	911	731
Level 2 | Asset-backed securities
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	365	288
Level 2 | Municipal securities
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	166	149
Level 2 | U.S. Treasury notes
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	40	105
Level 2 | Other
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	45	42
Level 3
Fair value of assets measured on recurring basis
Total assets	0	0
Contingent consideration liabilities		8
Total liabilities		8
Level 3 | Corporate debt securities
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	0	0
Level 3 | Mortgage-backed securities
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	0	0
Level 3 | Asset-backed securities
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	0	0
Level 3 | Municipal securities
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	0	0
Level 3 | U.S. Treasury notes
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	0	0
Level 3 | Other
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	$ 0	$ 0

X

- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
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- Definition

Amount of liability recognized arising from contingent consideration in a business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 805
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479581/805-30-50-1

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-Publisher FASB
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-Publisher FASB
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- Definition

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).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479130/326-30-45-1

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- Definition

Fair value of financial and nonfinancial obligations.

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-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

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