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Fair Value Measurements and Investments - Investment Income (Detail) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020
Fair Value Disclosures [Abstract] |  |  |
Interest and dividend income on cash and investments | $ 69 | $ (16) | $ 80
Realized gains (losses), net on debt securities | 0 |  | 4
Equity securities: |  |  |
Unrealized gains (losses), net | (364) | 721 | 115
Realized gains (losses), net | 68 | 26 | 1
Investment income (expense) | $ (227) | $ 731 | $ 200

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- Definition Amount of realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27357-111563 + Details
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