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Fair Value Measurements (Tables)
 6 Months Ended
Mar. 31, 2021
Fair Value Disclosures [Abstract]  
Financial Assets and Financial Liabilities that are 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
March 31, 2021:
Derivative instruments:
Assets:
Commodity contracts$73 $162 $— $235 
Foreign currency contracts$— $25 $— $25 
Liabilities:
Commodity contracts$(63)$(9)$— $(72)
Foreign currency contracts$— $(12)$— $(12)
Interest rate contracts$— $(39)$— $(39)
Non-qualified supplemental postretirement grantor trust investments (a)$40 $— $— $40 
September 30, 2020:
Derivative instruments:
Assets:
Commodity contracts$68 $39 $— $107 
Foreign currency contracts$— $32 $— $32 
Liabilities:
Commodity contracts$(54)$(64)$— $(118)
Foreign currency contracts$— $(14)$— $(14)
Interest rate contracts$— $(55)$— $(55)
Non-qualified supplemental postretirement grantor trust investments (a)$42 $— $— $42 
March 31, 2020:
Derivative instruments:
Assets:
Commodity contracts$36 $12 $— $48 
Foreign currency contracts$— $59 $— $59 
Liabilities:
Commodity contracts$(92)$(222)$— $(314)
Foreign currency contracts$— $(7)$— $(7)
Interest rate contracts$— $(54)$— $(54)
Non-qualified supplemental postretirement grantor trust investments (a)$39 $— $— $39 
(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:
March 31, 2021September 30, 2020March 31, 2020
Carrying amount$6,046 $6,081 $5,879 
Estimated fair value$6,362 $6,504 $5,736