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Fair Value Measurements - Financial Instruments on a Recurring Basis (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	$ 3,202	$ 1,875
Total assets	3,202	1,875
Contingent consideration liabilities	47	46
Total liabilities	47	46
Corporate debt securities
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	1,833	1,256
Mortgage-backed securities
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	614	392
U.S. Treasury notes
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	353	27
Asset-backed securities
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	247	132
Municipal securities
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	123	68
Other
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	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 | U.S. Treasury notes
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 | Other
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	0
Level 2
Fair value of assets measured on recurring basis
Total assets	3,202	1,875
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	1,833	1,256
Level 2 | Mortgage-backed securities
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	614	392
Level 2 | U.S. Treasury notes
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	353	27
Level 2 | Asset-backed securities
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	247	132
Level 2 | Municipal securities
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	123	68
Level 2 | Other
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	32
Level 3
Fair value of assets measured on recurring basis
Total assets	0	0
Contingent consideration liabilities	47	46
Total liabilities	47	46
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 | U.S. Treasury notes
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 | Other
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	$ 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
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-Section 50
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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)
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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).

+ 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 http://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454

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Fair value of financial and nonfinancial obligations.

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-Topic 820
-SubTopic 10
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