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Retirement Plans - Narrative (Details) $ in Millions	12 Months Ended
	Sep. 30, 2024 USD ($) person	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)
Retirement Plans [Line Items]
Total employer contributions to defined benefit plans	$ 25
Estimated future employer contributions to defined benefit plans in next fiscal year	23
Voluntary contributions made by the company to defined benefit plans	0
Matching contributions charged to expense for defined contribution savings plans	$ 208	$ 209	$ 196
Number of multiemployer benefit plans in which the Company participates | person	240
Multiemployer plan, employer contribution, cost	$ 80	$ 67	$ 71
Postretirement Benefits
Retirement Plans [Line Items]
Total employer contributions to defined benefit plans	2
Estimated future employer contributions to defined benefit plans in next fiscal year	$ 2

X

- Definition

Defined benefit plan aggregate contributions.

+ References

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X

- Definition

Number of multiemployer benefit plans in which the Company participates.

+ References

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- Definition

Retirement Plans [Line Items]

+ References

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- Definition

Voluntary contributions made by the company to defined benefit plans.

+ References

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- Definition

Amount of contribution expected to be received by defined benefit plan from employer in next fiscal year following current fiscal year.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 18
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480482/715-20-55-18

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-Publisher FASB
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X

- Definition

Amount of cost for defined contribution plan.

+ References

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-Topic 715
-SubTopic 70
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
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- Definition

Amount of cost for employer contribution to multiemployer plan. Multiemployer plan includes, but is not limited to, pension plan determined to be individually significant and insignificant and other postretirement benefit plan.

+ References

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-Topic 715
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