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Fair Value Measurements (Tables)
 9 Months Ended
Jun. 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:
 Asset (Liability)
Level 1Level 2Level 3Total
June 30, 2022:
Derivative instruments:
Assets:
Commodity contracts$816 $1,149 $— $1,965 
Foreign currency contracts$— $59 $— $59 
Interest rate contracts$— $44 $— $44 
Liabilities:
Commodity contracts$(324)$(37)$— $(361)
Foreign currency contracts$— $(2)$— $(2)
Non-qualified supplemental postretirement grantor trust investments (a)$46 $— $— $46 
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 
June 30, 2021:
Derivative instruments:
Assets:
Commodity contracts$241 $396 $— $637 
Foreign currency contracts$— $24 $— $24 
Liabilities:
Commodity contracts$(136)$(9)$— $(145)
Foreign currency contracts$— $(13)$— $(13)
Interest rate contracts$— $(35)$— $(35)
Non-qualified supplemental postretirement grantor trust investments (a)$42 $— $— $42 
(a)Consists primarily of mutual fund investments held in grantor trusts associated with non-qualified supplemental retirement plans.
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:
June 30, 2022September 30, 2021June 30, 2021
Carrying amount$6,483 $6,491 $5,890 
Estimated fair value$6,145 $6,996 $6,314