Fair Value Measurements (Tables)

12 Months Ended

Sep. 30, 2025

Fair Value Disclosures [Abstract]

Schedule of Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis

The following table presents, on a gross basis, our financial assets and liabilities, including both current and noncurrent portions, that are measured at fair value on a recurring basis within the fair value hierarchy as described in Note 2:

	Asset (Liability)
	Level 1		Level 2		Level 3		Total
September 30, 2025:
Derivative instruments:
Assets:
Commodity contracts	$	85	$	11	$	—	$	96
Foreign currency contracts	$	—	$	1	$	—	$	1
Liabilities:
Commodity contracts	$	(72)	$	(61)	$	—	$	(133)
Foreign currency contracts	$	—	$	(19)	$	—	$	(19)
Interest rate contracts	$	—	$	(12)	$	—	$	(12)
Non-qualified supplemental postretirement grantor trust investments (a)	$	35	$	—	$	—	$	35
September 30, 2024
Derivative instruments:
Assets:
Commodity contracts	$	106	$	27	$	—	$	133
Foreign currency contracts	$	—	$	6	$	—	$	6
Interest rate contracts	$	—	$	1	$	—	$	1
Liabilities:
Commodity contracts	$	(120)	$	(32)	$	—	$	(152)
Foreign currency contracts	$	—	$	(9)	$	—	$	(9)
Interest rate contracts	$	—	$	(22)	$	—	$	(22)
Non-qualified supplemental postretirement grantor trust investments (a)	$	43	$	—	$	—	$	43

(a)Consists primarily of mutual fund investments held in grantor trusts associated with non-qualified supplemental retirement plans (see Note 8).

Schedule of Carrying Amount and Estimated Fair Value of Long-term Debt

The carrying amounts and estimated fair values of our long-term debt (including current maturities but excluding unamortized debt issuance costs) were as follows:

	2025		2024
Carrying amount	$	6,701	$	6,733
Estimated fair value	$	6,777	$	6,663