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Fair Value Measurements and Investments - Additional Information (Details) - USD ($) | Feb. 01, 2026 | Mar. 31, 2026 | Sep. 30, 2025
--- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Impairment of indefinite-lived intangible assets and goodwill | $ 0 |  |
Senior Notes |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Carrying value of debt |  | $ 24,000,000,000.0 | $ 25,200,000,000
Estimated Fair Value | Senior Notes |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Estimated fair value of debt |  | $ 21,800,000,000 | $ 23,300,000,000

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