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Income Taxes - Schedule of Differences between U.S. Federal Statutory Income Tax Rate and Income Taxes Provided (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Income Tax Disclosure [Abstract] |  |  |
U.S. federal corporate statutory tax rate | 21.00% |  |
Taxes on income at the U.S. federal statutory rate | $ 128 | $ 155 | $ 96
U.S. state and local taxes | 12 | 15 | 10
Foreign income taxed at different rates, including withholding taxes | 34 | 28 | 34
Valuation allowance | (5) | (6) | (4)
Change in tax rates | 0 | 1 | 10
GILTI and FDII | (4) | (6) | (4)
Federal research and development credits | (8) | 0 | 0
Uncertain tax positions | 7 | (3) | 0
Non-deductible compensation | 7 | 6 | 5
Other | (1) | (5) | 2
Income tax expense | $ 170 | $ 185 | $ 149

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- Definition Amount of reported income tax expense (benefit) in excess of (less than) expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to nondeductible expense for award under share-based payment arrangement. Includes, but is not limited to, expense determined to be nondeductible upon grant or after for award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-12 + Details
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