Fair Value Measurements (Tables)

12 Months Ended

Sep. 30, 2022

Fair Value Disclosures [Abstract]

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, 2022:
Derivative instruments:
Assets:
Commodity contracts (b)	$	938	$	1,268	$	27	$	2,233
Foreign currency contracts	$	—	$	119	$	—	$	119
Interest rate contracts	$	—	$	66	$	—	$	66
Liabilities:
Commodity contracts (b)	$	(377)	$	(136)	$	—	$	(513)
Foreign currency contracts	$	—	$	(2)	$	—	$	(2)
Non-qualified supplemental postretirement grantor trust investments (a)	$	43	$	—	$	—	$	43
September 30, 2021
Derivative instruments:
Assets:
Commodity contracts	$	641	$	1,008	$	—	$	1,649
Foreign currency contracts	$	—	$	38	$	—	$	38
Liabilities:
Commodity contracts	$	(264)	$	(16)	$	—	$	(280)
Foreign currency contracts	$	—	$	(8)	$	—	$	(8)
Interest rate contracts	$	—	$	(29)	$	—	$	(29)
Non-qualified supplemental postretirement grantor trust investments (a)	$	53	$	—	$	—	$	53

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

(b)Includes derivative assets and liabilities held-for-sale associated with the October 2022 sale of the United Kingdom energy marketing business (see Note 25).

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:

	2022		2021
Carrying amount	$	6,665	$	6,491
Estimated fair value	$	6,189	$	6,996