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Short-term Investments (Components of Investments) (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Amortized cost of available-for-sale debt securities	$ 2,205	$ 5,860
Unrealized gains, available-for-sale debt securities	0	3
Unrealized losses, available-for-sale debt securities	0	(1)
Fair value of available-for-sale debt securities	2,205	5,862
Cash	2,938	4,362
Short-term investments and cash	5,143	10,224
Commercial paper | Level 2
Debt Securities, Available-for-sale [Line Items]
Amortized cost of available-for-sale debt securities	813	3,154
Unrealized gains, available-for-sale debt securities	0	2
Unrealized losses, available-for-sale debt securities	0	0
Fair value of available-for-sale debt securities	813	3,156
Certificates of deposit and time deposits | Level 2
Debt Securities, Available-for-sale [Line Items]
Amortized cost of available-for-sale debt securities	1,284	1,836
Unrealized gains, available-for-sale debt securities	0	1
Unrealized losses, available-for-sale debt securities	0	0
Fair value of available-for-sale debt securities	1,284	1,837
U.S. government securities | Level 1
Debt Securities, Available-for-sale [Line Items]
Amortized cost of available-for-sale debt securities	89	785
Unrealized gains, available-for-sale debt securities	0	0
Unrealized losses, available-for-sale debt securities	0	(1)
Fair value of available-for-sale debt securities	89	784
Corporate notes and bonds | Level 2
Debt Securities, Available-for-sale [Line Items]
Amortized cost of available-for-sale debt securities	19	85
Unrealized gains, available-for-sale debt securities	0	0
Unrealized losses, available-for-sale debt securities	0	0
Fair value of available-for-sale debt securities	19	85
Cash and Cash Equivalents
Debt Securities, Available-for-sale [Line Items]
Fair value of available-for-sale debt securities	1,064	1,081
Cash	2,938	4,362
Short-term investments and cash	4,002	5,443
Cash and Cash Equivalents | Commercial paper | Level 2
Debt Securities, Available-for-sale [Line Items]
Fair value of available-for-sale debt securities	64	281
Cash and Cash Equivalents | Certificates of deposit and time deposits | Level 2
Debt Securities, Available-for-sale [Line Items]
Fair value of available-for-sale debt securities	1,000	800
Cash and Cash Equivalents | U.S. government securities | Level 1
Debt Securities, Available-for-sale [Line Items]
Fair value of available-for-sale debt securities	0	0
Cash and Cash Equivalents | Corporate notes and bonds | Level 2
Debt Securities, Available-for-sale [Line Items]
Fair value of available-for-sale debt securities	0	0
Short-term Investments
Debt Securities, Available-for-sale [Line Items]
Fair value of available-for-sale debt securities	1,141	4,781
Cash	0	0
Short-term investments and cash	1,141	4,781
Short-term Investments | Commercial paper | Level 2
Debt Securities, Available-for-sale [Line Items]
Fair value of available-for-sale debt securities	749	2,875
Short-term Investments | Certificates of deposit and time deposits | Level 2
Debt Securities, Available-for-sale [Line Items]
Fair value of available-for-sale debt securities	284	1,037
Short-term Investments | U.S. government securities | Level 1
Debt Securities, Available-for-sale [Line Items]
Fair value of available-for-sale debt securities	89	784
Short-term Investments | Corporate notes and bonds | Level 2
Debt Securities, Available-for-sale [Line Items]
Fair value of available-for-sale debt securities	$ 19	$ 85

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