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Financial Instruments - Fair Values on Recurring Basis (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Equity Securities, FV-NI, Gain (Loss) |  |  |  |  |
Equity securities, unrealized gain (loss) | $ 443 | $ 284 | $ (1,700) | $ (195) |
Recurring |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Cash | 10,194 |  | 10,194 |  | $ 11,706
Debt Securities, Available-for-sale |  |  |  |  |
Gross unrealized gains | 1 |  | 1 |  |
Gross unrealized losses | (226) |  | (226) |  |
Cash, Cash Equivalents, and Marketable Securities |  |  |  |  |
Cash, cash equivalents and marketable securities | 89,587 |  | 89,587 |  | 87,283
Cash, cash equivalents and marketable securities, amortized cost | 86,795 |  | 86,795 |  |
Less: Restricted cash, cash equivalents, and marketable securities | (495) |  | (495) |  | (503)
Total cash, cash equivalents, and marketable securities | 89,092 |  | 89,092 |  | 86,780
Recurring | Level 1 securities |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Equity securities | 3,017 |  | 3,017 |  | 4,658
Recurring | Level 1 securities | Money market funds |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Money market funds | 21,631 |  | 21,631 |  | 39,160
Recurring | Level 1 securities | Money market funds | Money market funds |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Money market funds | 21,631 |  | 21,631 |  |
Recurring | Level 2 securities | Foreign government and agency securities |  |  |  |  |
Debt Securities, Available-for-sale |  |  |  |  |
Fixed income securities, amortized cost | 19 |  | 19 |  |
Gross unrealized gains | 0 |  | 0 |  |
Gross unrealized losses | 0 |  | 0 |  |
Fixed income securities | 19 |  | 19 |  | 505
Recurring | Level 2 securities | U.S. government and agency securities |  |  |  |  |
Debt Securities, Available-for-sale |  |  |  |  |
Fixed income securities, amortized cost | 1,967 |  | 1,967 |  |
Gross unrealized gains | 1 |  | 1 |  |
Gross unrealized losses | (80) |  | (80) |  |
Fixed income securities | 1,888 |  | 1,888 |  | 1,699
Recurring | Level 2 securities | Corporate debt securities |  |  |  |  |
Debt Securities, Available-for-sale |  |  |  |  |
Fixed income securities, amortized cost | 51,577 |  | 51,577 |  |
Gross unrealized gains | 0 |  | 0 |  |
Gross unrealized losses | (110) |  | (110) |  |
Fixed income securities | 51,467 |  | 51,467 |  | 27,805
Recurring | Level 2 securities | Asset-backed securities |  |  |  |  |
Debt Securities, Available-for-sale |  |  |  |  |
Fixed income securities, amortized cost | 1,320 |  | 1,320 |  |
Gross unrealized gains | 0 |  | 0 |  |
Gross unrealized losses | (33) |  | (33) |  |
Fixed income securities | 1,287 |  | 1,287 |  | 1,646
Recurring | Level 2 securities | Other debt securities |  |  |  |  |
Debt Securities, Available-for-sale |  |  |  |  |
Fixed income securities, amortized cost | 87 |  | 87 |  |
Gross unrealized gains | 0 |  | 0 |  |
Gross unrealized losses | (3) |  | (3) |  |
Fixed income securities | $ 84 |  | $ 84 |  | $ 104

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