Financial Instruments - Financial Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Derivative instruments (Note 8)	$ 7	$ 6
Derivative instruments (Note 8)	11	32
Level 2
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	16,365	18,220
Certificates of deposit \| Level 2
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	47	188
U.S. treasury bills \| Level 2
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	30	767
U.S. treasury notes \| Level 2
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	6,807	7,552
Corporate debt securities \| Level 2
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	5,892	6,369
Government debt securities \| Level 2
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	148	139
Fair Value, Recurring
Debt Securities, Available-for-sale [Line Items]
Derivative instruments (Note 8)	7	6
Total	16,171	16,100
Derivative instruments (Note 8)	11	32
Fair Value, Recurring \| Level 1
Debt Securities, Available-for-sale [Line Items]
Derivative instruments (Note 8)	0	0
Total	3,108	1,079
Derivative instruments (Note 8)	0	0
Fair Value, Recurring \| Level 2
Debt Securities, Available-for-sale [Line Items]
Derivative instruments (Note 8)	7	6
Total	13,063	15,021
Derivative instruments (Note 8)	11	32
Fair Value, Recurring \| Money market funds
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	3,067	1,079
Fair Value, Recurring \| Money market funds \| Level 1
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	3,067	1,079
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	47	188
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	47	188
Fair Value, Recurring \| U.S. treasury bills
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	30	767
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	30	767
Fair Value, Recurring \| U.S. treasury notes
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	6,807	7,552
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	6,807	7,552
Fair Value, Recurring \| Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	6,024	6,369
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	6,024	6,369
Fair Value, Recurring \| Government debt securities
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	148	139
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	148	$ 139
Fair Value, Recurring \| Equity investments
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	41
Fair Value, Recurring \| Equity investments \| Level 1
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	41
Fair Value, Recurring \| Equity investments \| Level 2
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	$ 0

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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