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Debt - Summary of Interest Costs and Payments (Detail) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020
Debt Disclosure [Abstract] |  |  |
Charged to operations | $ 398 | $ 469 | $ 528
Capitalized | 46 | 44 | 43
Total interest costs | 444 | 512 | 571
Interest paid, net of amounts capitalized | $ 390 | $ 474 | $ 515

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