Convertible Senior Notes - Debt Outstanding (Details)	9 Months Ended
Sep. 30, 2024 USD ($)	Dec. 31, 2023 USD ($)
2027 Notes
Debt Instrument [Line Items]
Principal Amount Outstanding	$ 1,000,000,000
Interest Rate Per Year	1.25%
Fair value	$ 862,000,000.0	$ 822,000,000.0
Conversion ratio	0.0041258
Remaining Contractual Life	2 years 8 months 12 days
2025 Notes
Debt Instrument [Line Items]
Principal Amount Outstanding	$ 700,000
Interest Rate Per Year	1.375%
Fair value	$ 600,000	300,000
Conversion ratio	0.0186621
Remaining Contractual Life	7 months 6 days
Livongo Notes
Debt Instrument [Line Items]
Principal Amount Outstanding	$ 550,000,000.0
Interest Rate Per Year	0.875%
Fair value	$ 529,700,000	$ 513,700,000
Conversion ratio	0.01394
Remaining Contractual Life	8 months 12 days
Convertible Notes Payable
Debt Instrument [Line Items]
Principal multiple amount used in the conversion of the debt instrument	$ 1,000

The remaining contractual life of the convertible debt instrument.

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The principal multiple amount used in the conversion of the debt instrument.

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The rate of interest that was being paid on the original debt issue that is being converted in the noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount.

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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