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Financial Instruments - Fair Values on Recurring Basis (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Equity Securities, FV-NI, Gain (Loss) |  |  |  |  |
Equity securities, unrealized gain (loss) | $ (145) | $ 1,200 | $ (1,800) | $ 1,000 |
Recurring |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Cash | 15,401 |  | 15,401 |  | $ 11,706
Debt Securities, Available-for-sale |  |  |  |  |
Gross unrealized gains | 9 |  | 9 |  |
Gross unrealized losses | (124) |  | (124) |  |
Cash, Cash Equivalents, and Marketable Securities |  |  |  |  |
Cash, cash equivalents and marketable securities | 91,637 |  | 91,637 |  | 87,283
Cash, cash equivalents and marketable securities, amortized cost | 88,888 |  | 88,888 |  |
Less: Restricted cash, cash equivalents, and marketable securities | (3,586) |  | (3,586) |  | (503)
Total cash, cash equivalents, and marketable securities | 88,051 |  | 88,051 |  | 86,780
Recurring | Level 1 securities |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Equity securities | 2,864 |  | 2,864 |  | 4,658
Recurring | Level 1 securities | Money market funds |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Money market funds | 28,793 |  | 28,793 |  | 39,160
Recurring | Level 1 securities | Money market funds | Money market funds |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Money market funds | 28,793 |  | 28,793 |  |
Recurring | Level 2 securities | Foreign government and agency securities |  |  |  |  |
Debt Securities, Available-for-sale |  |  |  |  |
Fixed income securities, amortized cost | 302 |  | 302 |  |
Gross unrealized gains | 0 |  | 0 |  |
Gross unrealized losses | 0 |  | 0 |  |
Fixed income securities | 302 |  | 302 |  | 505
Recurring | Level 2 securities | U.S. government and agency securities |  |  |  |  |
Debt Securities, Available-for-sale |  |  |  |  |
Fixed income securities, amortized cost | 2,309 |  | 2,309 |  |
Gross unrealized gains | 1 |  | 1 |  |
Gross unrealized losses | (51) |  | (51) |  |
Fixed income securities | 2,259 |  | 2,259 |  | 1,699
Recurring | Level 2 securities | Corporate debt securities |  |  |  |  |
Debt Securities, Available-for-sale |  |  |  |  |
Fixed income securities, amortized cost | 41,001 |  | 41,001 |  |
Gross unrealized gains | 7 |  | 7 |  |
Gross unrealized losses | (52) |  | (52) |  |
Fixed income securities | 40,956 |  | 40,956 |  | 27,805
Recurring | Level 2 securities | Asset-backed securities |  |  |  |  |
Debt Securities, Available-for-sale |  |  |  |  |
Fixed income securities, amortized cost | 1,018 |  | 1,018 |  |
Gross unrealized gains | 1 |  | 1 |  |
Gross unrealized losses | (20) |  | (20) |  |
Fixed income securities | 999 |  | 999 |  | 1,646
Recurring | Level 2 securities | Other debt securities |  |  |  |  |
Debt Securities, Available-for-sale |  |  |  |  |
Fixed income securities, amortized cost | 64 |  | 64 |  |
Gross unrealized gains | 0 |  | 0 |  |
Gross unrealized losses | (1) |  | (1) |  |
Fixed income securities | $ 63 |  | $ 63 |  | $ 104

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