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Fair Value Measurements - Financial Instruments on a Recurring Basis (Details) - USD ($) $ in Millions	Dec. 31, 2020	Sep. 30, 2020	Dec. 31, 2019
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	$ 1,875		$ 1,946
Total assets	1,875		1,975
Contingent consideration liabilities	46	$ 46
Total liabilities	46		29
Corporate debt securities
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	1,256		1,178
Mortgage-backed securities
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	392		420
Asset-backed securities
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	132		127
Municipal securities
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	68		78
Certificates of deposit
Fair value of assets measured on recurring basis
Debt securities, available-for-sale			1
U.S. Treasury notes
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	27		86
Government-sponsored enterprise securities (“GSEs”)
Fair value of assets measured on recurring basis
Debt securities, available-for-sale			49
Other
Fair value of assets measured on recurring basis
Debt securities, available-for-sale			7
Call option derivative asset
Fair value of assets measured on recurring basis
Call option derivative asset			29
Conversion option derivative liability
Fair value of assets measured on recurring basis
Conversion option derivative liability			29
Level 1
Fair value of assets measured on recurring basis
Debt securities, available-for-sale			0
Total assets	0		0
Contingent consideration liabilities	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 | Certificates of deposit
Fair value of assets measured on recurring basis
Debt securities, available-for-sale			0
Level 1 | U.S. Treasury notes
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	0		0
Level 1 | Government-sponsored enterprise securities (“GSEs”)
Fair value of assets measured on recurring basis
Debt securities, available-for-sale			0
Level 1 | Other
Fair value of assets measured on recurring basis
Debt securities, available-for-sale			0
Level 1 | Call option derivative asset
Fair value of assets measured on recurring basis
Call option derivative asset			0
Level 1 | Conversion option derivative liability
Fair value of assets measured on recurring basis
Conversion option derivative liability			0
Level 2
Fair value of assets measured on recurring basis
Debt securities, available-for-sale			1,946
Total assets	1,875		1,946
Contingent consideration liabilities	0
Total liabilities	0		0
Level 2 | Corporate debt securities
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	1,256		1,178
Level 2 | Mortgage-backed securities
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	392		420
Level 2 | Asset-backed securities
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	132		127
Level 2 | Municipal securities
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	68		78
Level 2 | Certificates of deposit
Fair value of assets measured on recurring basis
Debt securities, available-for-sale			1
Level 2 | U.S. Treasury notes
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	27		86
Level 2 | Government-sponsored enterprise securities (“GSEs”)
Fair value of assets measured on recurring basis
Debt securities, available-for-sale			49
Level 2 | Other
Fair value of assets measured on recurring basis
Debt securities, available-for-sale			7
Level 2 | Call option derivative asset
Fair value of assets measured on recurring basis
Call option derivative asset			0
Level 2 | Conversion option derivative liability
Fair value of assets measured on recurring basis
Conversion option derivative liability			0
Level 3
Fair value of assets measured on recurring basis
Debt securities, available-for-sale			0
Total assets	0		29
Contingent consideration liabilities	46
Total liabilities	46		29
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 | Certificates of deposit
Fair value of assets measured on recurring basis
Debt securities, available-for-sale			0
Level 3 | U.S. Treasury notes
Fair value of assets measured on recurring basis
Debt securities, available-for-sale	$ 0		0
Level 3 | Government-sponsored enterprise securities (“GSEs”)
Fair value of assets measured on recurring basis
Debt securities, available-for-sale			0
Level 3 | Other
Fair value of assets measured on recurring basis
Debt securities, available-for-sale			0
Level 3 | Call option derivative asset
Fair value of assets measured on recurring basis
Call option derivative asset			29
Level 3 | Conversion option derivative liability
Fair value of assets measured on recurring basis
Conversion option derivative liability			$ 29

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

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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).

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