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Pension and Retirement Plans - Narrative (Details) $ in Millions	12 Months Ended
	Sep. 30, 2025 USD ($) plan	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)
Retirement Plans [Line Items]
Total employer contributions to defined benefit plans	$ 31
Estimated future employer contributions to defined benefit plans in next fiscal year	21
Voluntary contributions made by the company to defined benefit plans	0
Matching contributions charged to expense for defined contribution savings plans	$ 192	$ 208	$ 209
Number of multiemployer benefit plans in which the Company participates | plan	245
Multiemployer plan, employer contribution, cost	$ 86	$ 80	$ 67

X

- Definition

Defined benefit plan aggregate contributions.

+ References

No definition available.

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- 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

No definition available.

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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/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
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-Publisher FASB
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- Definition

Amount of cost for defined contribution plan.

+ References

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-Section 50
-Paragraph 1
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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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
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