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Other assets - Non-Readily Marketable Equity Securities (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Jun. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Other Assets [Abstract] |  |  |  |  |  |
Equity securities without readily determinable fair value, amount | $ 473 |  |  | $ 473 |  | $ 413
Equity securities without readily determinable fair value, upward price adjustment, annual amount | 2 | $ 18 | $ 0 | 32 | $ 1 |
Equity securities without readily determinable fair value, downward price adjustment, annual amount | 0 | (1) | 0 | (1) | 0 |
Equity securities without readily determinable fair value, net adjustment, annual amount | 2 | $ 17 | $ 0 | 31 | $ 1 |
Equity securities without readily determinable fair value, upward price adjustment, cumulative amount | 368 |  |  | 368 |  |
Equity securities without readily determinable fair value, downward price adjustment, cumulative amount | (56) |  |  | (56) |  |
Equity securities without readily determinable fair value, net price adjustment, cumulative amount | $ 312 |  |  | $ 312 |  |

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- Definition Equity Securities without Readily Determinable Fair Value, Net Adjustment, Annual Amount + References No definition available. + Details
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- Definition Equity Securities without Readily Determinable Fair Value, Net Adjustment, Cumulative Amount + References No definition available. + Details
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- Definition Amount of investment in equity security without readily determinable fair value. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 321 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479536/321-10-50-3 + Details
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- Definition Amount of loss from downward price adjustment on investment in equity security without readily determinable fair value. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 321 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479536/321-10-50-3 + Details
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- Definition Amount of gain from upward price adjustment on investment in equity security without readily determinable fair value. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 321 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479536/321-10-50-3 + Details
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- Definition Amount of cumulative gain from upward price adjustment on investment in equity security without readily determinable fair value. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 321 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479536/321-10-50-3 + Details
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