Commitments and Contingencies (Details)	3 Months Ended	12 Months Ended
	Dec. 31, 2021 USD ($) subsidiary	Sep. 30, 2017 USD ($) record_of_decision	Sep. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)
Loss Contingencies
Environmental expenditures cap during calendar year	$ 5,000,000
CPG, PNG and UGI Gas COAs
Loss Contingencies
Accrual for environmental loss contingencies	$ 50,000,000		$ 50,000,000	$ 49,000,000
Utilities
Loss Contingencies
Number of subsidiaries acquired with similar histories | subsidiary	2
AmeriGas OLP | Saranac Lake, New York | NYDEC ROD
Loss Contingencies
Accrual for environmental loss contingencies	$ 8,000,000
Loss contingency, number of remediation plans | record_of_decision		3
Estimated remediation plan cost		$ 28,000,000