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Fair Value Measurements - Financial Instruments on a Recurring Basis (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	$ 3,499	$ 3,202
Total assets	3,499	3,202
Contingent consideration liabilities	8	47
Total liabilities	8	47
Corporate debt securities
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	2,184	1,833
Mortgage-backed securities
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	731	614
Asset-backed securities
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	288	247
Municipal securities
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	149	123
U.S. Treasury notes
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	105	353
Other
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	42	32
Level 1
Fair value of assets measured on recurring basis
Total assets	0	0
Contingent consideration liabilities	0	0
Total liabilities	0	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	3,499	3,202
Contingent consideration liabilities	0	0
Total liabilities	0	0
Level 2 | Corporate debt securities
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	2,184	1,833
Level 2 | Mortgage-backed securities
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	731	614
Level 2 | Asset-backed securities
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	288	247
Level 2 | Municipal securities
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	149	123
Level 2 | U.S. Treasury notes
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	105	353
Level 2 | Other
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	42	32
Level 3
Fair value of assets measured on recurring basis
Total assets	0	0
Contingent consideration liabilities	8	47
Total liabilities	8	47
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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-URI https://asc.fasb.org/extlink&oid=126975305&loc=d3e6927-128479

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-Name Accounting Standards Codification
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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454

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- Definition

Fair value of financial and nonfinancial obligations.

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-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
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