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Fair Value Measurements and Investments - Additional Information (Detail) - USD ($) |  | 3 Months Ended |
--- | --- | --- | ---
Feb. 01, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Sep. 30, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Unrealized gains (losses) on equity securities held as of the end of the period |  | $ 36,000,000 | $ (102,000,000) |
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 |  | 20,700,000,000 |  | $ 20,500,000,000
Estimated Fair Value | Senior Notes |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Estimated fair value of debt |  | $ 19,000,000,000 |  | $ 17,700,000,000

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