Fair Value Measurements (Tables)

6 Months Ended

Mar. 31, 2024

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 1		Level 2		Level 3		Total
March 31, 2024:
Derivative instruments:
Assets:
Commodity contracts	$	107	$	39	$	—	$	146
Foreign currency contracts	$	—	$	16	$	—	$	16
Interest rate contracts	$	—	$	11	$	—	$	11
Liabilities:
Commodity contracts	$	(184)	$	(38)	$	—	$	(222)
Foreign currency contracts	$	—	$	(1)	$	—	$	(1)
Interest rate contracts	$	—	$	(3)	$	—	$	(3)
Non-qualified supplemental postretirement grantor trust investments (a)	$	41	$	—	$	—	$	41
September 30, 2023:
Derivative instruments:
Assets:
Commodity contracts (b)	$	117	$	115	$	—	$	232
Foreign currency contracts	$	—	$	38	$	—	$	38
Interest rate contracts	$	—	$	28	$	—	$	28
Liabilities:
Commodity contracts (b)	$	(193)	$	(81)	$	—	$	(274)
Foreign currency contracts	$	—	$	(2)	$	—	$	(2)
Non-qualified supplemental postretirement grantor trust investments (a)	$	39	$	—	$	—	$	39
March 31, 2023:
Derivative instruments:
Assets:
Commodity contracts	$	229	$	145	$	—	$	374
Foreign currency contracts	$	—	$	23	$	—	$	23
Interest rate contracts	$	—	$	25	$	—	$	25
Liabilities:
Commodity contracts	$	(294)	$	(138)	$	—	$	(432)
Foreign currency contracts	$	—	$	(4)	$	—	$	(4)
Interest rate contracts	$	—	$	(21)	$	—	$	(21)
Non-qualified supplemental postretirement grantor trust investments (a)	$	31	$	—	$	—	$	31

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

(b)Includes derivative assets and liabilities associated with certain UGI International energy marketing business transactions (see Note 5).

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, 2024		September 30, 2023		March 31, 2023
Carrying amount	$	6,826	$	6,647	$	6,805
Estimated fair value	$	6,647	$	6,238	$	6,480