v3.25.2
Fair Value Measurements (Tables)
 9 Months Ended
Jun. 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:
 Asset (Liability)
Level 1Level 2Level 3Total
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 
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 
June 30, 2024:
Derivative instruments:
Assets:
Commodity contracts$92 $45 $— $137 
Foreign currency contracts$— $18 $— $18 
Interest rate contracts$— $7 $— $7 
Liabilities:
Commodity contracts$(148)$(26)$— $(174)
Foreign currency contracts$— $(2)$— $(2)
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, 2025September 30, 2024June 30, 2024
Carrying amount$6,644 $6,733 $6,633 
Estimated fair value$6,743 $6,663 $6,312