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Valuation of debt and equity investments and certain liabilities - Additional Information (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Dec. 31, 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Credit losses related to available-for-sale investments |  |  | $ 0 | $ 0 |
Proceeds from sales, redemptions and maturities of short-term available-for-sale investments | $ 1,130,000,000 | $ 3,130,000,000 | 3,940,000,000 | $ 5,760,000,000 |
Level 3 |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Assets, fair value | 0 |  | 0 |  | $ 0
Liabilities, fair value | $ 0 |  | $ 0 |  | $ 0

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