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Summary of Significant Accounting Policies - Goodwill and Intangible Assets (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2025 USD ($) | Dec. 31, 2025 segment
Accounting Policies [Abstract] |  |
Number of operating segments | segment |  | 4
Impairment loss | $ | $ (6,723) |
Goodwill Impairment Loss Statement Of Income Or Comprehensive Income Extensible Enumeration Not Disclosed Flag |  | impairment to goodwill

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