v3.26.1
Fair Value Measurements (Tables)
 9 Months Ended
Jun. 30, 2026
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:
Asset (Liability)
Level 1Level 2Level 3Total
June 30, 2026:
Derivative instruments:
Assets:
Commodity contracts$58 $35 $— $93 
Foreign currency contracts$— $14 $— $14 
Interest rate contracts$— $5 $— $5 
Liabilities:
Commodity contracts$(83)$(22)$— $(105)
Foreign currency contracts$— $(4)$— $(4)
Interest rate contracts$— $(2)$— $(2)
Non-qualified supplemental postretirement grantor trust investments (a)$37 $— $— $37 
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 
June 30, 2025:
Derivative instruments:
Assets:
Commodity contracts$100 $13 $— $113 
Interest rate contracts$— $1 $— $1 
Liabilities:
Commodity contracts$(103)$(55)$— $(158)
Foreign currency contracts$— $(25)$— $(25)
Interest rate contracts$— $(14)$— $(14)
Non-qualified supplemental postretirement grantor trust investments (a)$34 $— $— $34 
(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, 2026September 30, 2025June 30, 2025
Carrying amount$6,768 $6,701 $6,644 
Estimated fair value$6,880 $6,777 $6,743