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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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