Financial Instruments - Financial Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Level 2
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	$ 10,814	$ 13,281
Certificates of deposit \| Level 2
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	29	27
U.S. treasury bills \| Level 2
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	588	807
U.S. treasury notes \| Level 2
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	3,548	4,343
Corporate debt securities \| Level 2
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	3,977	4,989
Government debt securities \| Level 2
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	194	208
Fair Value, Recurring
Debt Securities, Available-for-sale [Line Items]
Derivative instruments	2	4
Total	10,709	12,904
Derivative instruments	2	9
Fair Value, Recurring \| Level 1
Debt Securities, Available-for-sale [Line Items]
Derivative instruments	0	0
Total	678	1,596
Derivative instruments	0	0
Fair Value, Recurring \| Level 2
Debt Securities, Available-for-sale [Line Items]
Derivative instruments	2	4
Total	10,031	11,308
Derivative instruments	2	9
Fair Value, Recurring \| Money market funds
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	647	1,572
Fair Value, Recurring \| Money market funds \| Level 1
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	647	1,572
Fair Value, Recurring \| Money market funds \| Level 2
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	0	0
Fair Value, Recurring \| Certificates of deposit
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	29	27
Fair Value, Recurring \| Certificates of deposit \| Level 1
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	0	0
Fair Value, Recurring \| Certificates of deposit \| Level 2
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	29	27
Fair Value, Recurring \| U.S. treasury bills
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	1,972	1,246
Fair Value, Recurring \| U.S. treasury bills \| Level 1
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	0	0
Fair Value, Recurring \| U.S. treasury bills \| Level 2
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	1,972	1,246
Fair Value, Recurring \| U.S. treasury notes
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	3,548	4,343
Fair Value, Recurring \| U.S. treasury notes \| Level 1
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	0	0
Fair Value, Recurring \| U.S. treasury notes \| Level 2
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	3,548	4,343
Fair Value, Recurring \| Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	4,286	5,480
Fair Value, Recurring \| Corporate debt securities \| Level 1
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	0	0
Fair Value, Recurring \| Corporate debt securities \| Level 2
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	4,286	5,480
Fair Value, Recurring \| Government debt securities
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	194	208
Fair Value, Recurring \| Government debt securities \| Level 1
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	0	0
Fair Value, Recurring \| Government debt securities \| Level 2
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	194	208
Fair Value, Recurring \| Equity investments
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	31	24
Fair Value, Recurring \| Equity investments \| Level 1
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	31	24
Fair Value, Recurring \| Equity investments \| Level 2
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	$ 0	$ 0

Fair value portion of asset recognized for present right to economic benefit.

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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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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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