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Income Taxes - Narrative (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2025 | Dec. 31, 2025 | May 22, 2025 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Income Tax Disclosure |  |  |  |  |  |  |
Discrete charge related to new legislation |  | $ 15,930 |  |  |  |  |
Discrete charge related to new legislation, valuation allowance |  |  | $ 14,030 |  |  |  |
Valuation allowance, deferred tax assets |  |  | $ 15,895 |  | $ 3,506 |  |
Cumulative stock ownership change threshold (in percentage) |  |  | 50.00% |  |  |  |
Change in ownership percentage over period |  |  | 3 years |  |  |  |
Unrecognized tax benefits, interest and penalties accrued |  |  | $ 2,600 |  | 2,210 | $ 1,480 |
Unrecognized tax benefits |  |  | 16,450 |  | $ 15,131 | $ 11,666 | $ 10,757
Unrecognized tax benefits that would impact effective tax rate |  |  | 11,250 |  |  |  |
Income tax liability related to uncertain tax positions, noncurrent |  |  | 11,230 |  |  |  |
Income tax liability, deferred tax liabilities, noncurrent |  |  | 9,780 |  |  |  |
Internal Revenue Service (IRS) |  |  |  |  |  |  |
Income Tax Disclosure |  |  |  |  |  |  |
Intangible assets transferred to subsidiary, value |  |  |  | $ 7,790 |  |  |
Intangible assets transferred to subsidiary, increase in reported value |  |  |  | $ 1,480 |  |  |
Income tax examination, estimate of possible additional tax liability | $ 15,890 |  |  |  |  |  |
Domestic Tax Jurisdiction |  |  |  |  |  |  |
Income Tax Disclosure |  |  |  |  |  |  |
Operating loss carryforwards |  |  | 16,350 |  |  |  |
Tax credit carryforward |  |  | 7,850 |  |  |  |
State and Local Jurisdiction |  |  |  |  |  |  |
Income Tax Disclosure |  |  |  |  |  |  |
Operating loss carryforwards |  |  | 3,790 |  |  |  |
Tax credit carryforward |  |  | $ 6,800 |  |  |  |

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-2 + Details
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