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Fair Value Measurements and Investments - Additional Information (Details) - USD ($) |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Feb. 01, 2025 | Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Sep. 30, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Unrealized (loss) gain on investments |  | $ (7,000,000) | $ (16,000,000) | $ (40,000,000) | $ (3,000,000) |
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 |  | 25,100,000,000 |  | 25,100,000,000 |  | $ 20,800,000,000
Estimated Fair Value | Senior Notes |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Estimated fair value of debt |  | $ 23,200,000,000 |  | $ 23,200,000,000 |  | $ 19,200,000,000

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