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Financial Instruments - Fair Values on Recurring Basis (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Debt Securities, Available-for-sale |  |  |  |  |
Fixed income securities | $ 23,700 |  | $ 23,700 |  |
Equity Securities, FV-NI, Gain (Loss) |  |  |  |  |
Equity securities, unrealized gain (loss) | 153 | $ (145) | 341 | $ (1,800) |
Recurring |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Cash | 15,977 |  | 15,977 |  | $ 17,055
Debt Securities, Available-for-sale |  |  |  |  |
Gross unrealized gains | 64 |  | 64 |  |
Gross unrealized losses | (44) |  | (44) |  |
Cash, Cash Equivalents, and Marketable Securities |  |  |  |  |
Cash, cash equivalents and marketable securities | 97,739 |  | 97,739 |  | 104,735
Cash, cash equivalents and marketable securities, amortized cost | 94,499 |  | 94,499 |  |
Less: Restricted cash, cash equivalents, and marketable securities | (3,542) |  | (3,542) |  | (3,533)
Total cash, cash equivalents, and marketable securities | 94,197 |  | 94,197 |  | 101,202
Recurring | Level 1 securities |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Equity securities | 3,220 |  | 3,220 |  | 3,318
Recurring | Level 1 securities | Money market funds |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Money market funds | 32,317 |  | 32,317 |  | 28,282
Recurring | Level 1 securities | Money market funds | Money market funds |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Money market funds | 32,317 |  | 32,317 |  |
Recurring | Level 2 securities | Foreign government and agency securities |  |  |  |  |
Debt Securities, Available-for-sale |  |  |  |  |
Fixed income securities, amortized cost | 74 |  | 74 |  |
Gross unrealized gains | 0 |  | 0 |  |
Gross unrealized losses | 0 |  | 0 |  |
Fixed income securities | 74 |  | 74 |  | 177
Recurring | Level 2 securities | U.S. government and agency securities |  |  |  |  |
Debt Securities, Available-for-sale |  |  |  |  |
Fixed income securities, amortized cost | 5,400 |  | 5,400 |  |
Gross unrealized gains | 7 |  | 7 |  |
Gross unrealized losses | (23) |  | (23) |  |
Fixed income securities | 5,384 |  | 5,384 |  | 3,401
Recurring | Level 2 securities | Corporate debt securities |  |  |  |  |
Debt Securities, Available-for-sale |  |  |  |  |
Fixed income securities, amortized cost | 38,810 |  | 38,810 |  |
Gross unrealized gains | 49 |  | 49 |  |
Gross unrealized losses | (11) |  | (11) |  |
Fixed income securities | 38,848 |  | 38,848 |  | 50,912
Recurring | Level 2 securities | Asset-backed securities |  |  |  |  |
Debt Securities, Available-for-sale |  |  |  |  |
Fixed income securities, amortized cost | 1,893 |  | 1,893 |  |
Gross unrealized gains | 8 |  | 8 |  |
Gross unrealized losses | (10) |  | (10) |  |
Fixed income securities | 1,891 |  | 1,891 |  | 1,523
Recurring | Level 2 securities | Other debt securities |  |  |  |  |
Debt Securities, Available-for-sale |  |  |  |  |
Fixed income securities, amortized cost | 28 |  | 28 |  |
Gross unrealized gains | 0 |  | 0 |  |
Gross unrealized losses | 0 |  | 0 |  |
Fixed income securities | $ 28 |  | $ 28 |  | $ 67

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