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Benefit Plans - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Defined Benefit Plan Disclosure [Line Items]
Percent of total assets domestic plans	66.00%
Cost of the savings incentive plan	$ 195	$ 156	$ 178
Fixed Income Funds
Defined Benefit Plan Disclosure [Line Items]
Company's target allocation percentage for asset mix	45.00%
Diversified
Defined Benefit Plan Disclosure [Line Items]
Company's target allocation percentage for asset mix	21.00%
Equity securities
Defined Benefit Plan Disclosure [Line Items]
Company's target allocation percentage for asset mix	34.00%
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	$ 2,557	2,129	2,242
Pension plan projected benefit obligations	2,913	2,617	$ 2,634
Employer contribution	200	62
International plans | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	880	748
Pension plan projected benefit obligations	$ 992	833
Percent of total plan assets foreign plans	34.00%
International plans | Pension Plans | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	$ 196	173
United States | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	1,676	1,382
Employer contribution	150
United States | Pension Plans | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets at fair value	582	469
United States | Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Pension plan projected benefit obligations	$ 94	$ 92

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Percentage of the Company's total plan assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits related to domestic pension plans.

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Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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Amount of contribution received by defined benefit plan from employer which increases plan assets.

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Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

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