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Financial Instruments - Debt Securities (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash Equivalents $ 2,414 $ 1,498
Marketable securities 3,935 3,981
Long-term investments 676 709
Equity and Other Investments 4,363 4,647
Levels 1, 2 and 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash Equivalents 99 159
Marketable securities 3,935 3,981
Long-term investments 676 709
Equity and Other Investments 549 543
Fair Value 5,274 5,403
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash Equivalents 99 159
Marketable securities 2,231 2,166
Long-term investments 345 537
Equity and Other Investments 0 0
Fair Value 2,688 2,872
Level 1 | U.S. term deposits    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash Equivalents 0 0
Marketable securities 515 470
Long-term investments 0 0
Equity and Other Investments 0 0
Fair Value 526 481
Level 1 | U.S. federal bonds and agency securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash Equivalents 19 20
Marketable securities 1,716 1,696
Long-term investments 345 537
Equity and Other Investments 0 0
Fair Value 2,082 2,252
Level 1 | Corporate bonds and commercial paper    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash Equivalents 80 139
Marketable securities 0 0
Long-term investments 0 0
Equity and Other Investments 0 0
Fair Value 80 139
Level 2 | Corporate bonds and commercial paper    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash Equivalents 0 0
Marketable securities 1,704 1,815
Long-term investments 331 172
Equity and Other Investments 0 0
Fair Value 2,037 1,988
Level 3 | Convertible notes in private companies    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash Equivalents 0 0
Marketable securities 0 0
Long-term investments 0 0
Equity and Other Investments 549 543
Fair Value $ 549 $ 543