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Debt - Schedule of Principal Repayments of Long-term Debt (Details) - USD ($)	Nov. 21, 2025	Sep. 30, 2025	Jul. 31, 2025
Debt Instrument [Line Items]
2026		$ 117,000,000
2027		592,000,000
2028		1,995,000,000
2029		273,000,000
2030		1,837,000,000
Eliminations
Debt Instrument [Line Items]
2026		(35,000,000)
2027		(165,000,000)
2028		0
2029		0
2030		0
Utilities
Debt Instrument [Line Items]
2026		107,000,000
2027		70,000,000
2028		40,000,000
2029		0
2030		70,000,000
Utilities \| Senior Notes
Debt Instrument [Line Items]
Principal amount		175,000,000
Utilities \| Senior Notes \| Subsequent Event
Debt Instrument [Line Items]
Repurchased aggregate principal amount	$ 175,000,000
Utilities \| Senior Notes Due 2030 \| Senior Notes
Debt Instrument [Line Items]
Principal amount			$ 150,000,000
Interest rate (as a percentage)			5.10%
Utilities \| Senior Notes Due 2030 \| Senior Notes \| Subsequent Event
Debt Instrument [Line Items]
Principal amount	$ 150,000,000
Interest rate (as a percentage)	5.10%
Utilities \| Senior Notes Due 2035 \| Senior Notes
Debt Instrument [Line Items]
Principal amount			$ 125,000,000
Interest rate (as a percentage)			5.68%
Utilities \| Senior Notes Due 2035 \| Senior Notes \| Subsequent Event
Debt Instrument [Line Items]
Principal amount	$ 125,000,000
Interest rate (as a percentage)	5.68%
Midstream & Marketing
Debt Instrument [Line Items]
2026		8,000,000
2027		8,000,000
2028		8,000,000
2029		8,000,000
2030		746,000,000
UGI International
Debt Instrument [Line Items]
2026		2,000,000
2027		2,000,000
2028		354,000,000
2029		2,000,000
2030		471,000,000
AmeriGas Propane
Debt Instrument [Line Items]
2026		35,000,000
2027		677,000,000
2028		493,000,000
2029		0
2030		550,000,000
UGI Corporation
Debt Instrument [Line Items]
2026		0
2027		0
2028		1,100,000,000
2029		263,000,000
2030		$ 0