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Debt (Details) |  |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 08, 2024 USD ($) | Jun. 30, 2024 USD ($) $ / shares | Jun. 28, 2024 | Apr. 30, 2024 USD ($) | Jun. 30, 2024 USD ($) $ / shares | Jun. 30, 2024 USD ($) $ / shares | Jun. 30, 2023 USD ($) | Jun. 30, 2024 USD ($) $ / shares | Jun. 30, 2023 USD ($) | May 31, 2024 USD ($) | Mar. 31, 2024 USD ($) | Nov. 30, 2023 USD ($) | Nov. 09, 2023 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of notes |  |  |  |  |  |  |  | $ 1,196,000,000 | $ 1,867,000,000 |  |  |  |
Cash contribution |  |  |  |  | $ 315,000,000 |  |  |  |  |  |  |  |
Loss on extinguishments of debt |  |  |  |  |  | $ 7,000,000 | $ 9,000,000 | $ 7,000,000 | $ 9,000,000 |  |  |  |
Senior Notes | Senior Notes Due 2030 | Utilities |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  |  |  | $ 25,000,000 |
Interest rate |  |  |  |  |  |  |  |  |  |  |  | 6.02% |
Conversion price (in dollars per share) | $ / shares |  | $ 27.60 |  |  | $ 27.60 | $ 27.60 |  | $ 27.60 |  |  |  |  |
Initial conversion rate |  |  |  |  | 0.0362319 |  |  |  |  |  |  |  |
Senior Notes | Senior Notes Due 2033 | Utilities |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  |  |  | $ 150,000,000 |
Interest rate |  |  |  |  |  |  |  |  |  |  |  | 6.10% |
Senior Notes | Senior Notes Due 2053 | Utilities |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  |  |  | $ 75,000,000 |
Interest rate |  |  |  |  |  |  |  |  |  |  |  | 6.40% |
Senior Notes | AmeriGas Partners Senior Notes | AmeriGas Partners And AmeriGas Finance Corp. |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  | $ 218,000,000 |  |  | $ 218,000,000 | $ 218,000,000 |  | $ 218,000,000 |  |  |  |  |
Interest rate |  | 5.50% |  |  | 5.50% | 5.50% |  | 5.50% |  |  |  |  |
Repurchase amount |  | $ 475,000,000 |  |  | $ 475,000,000 | $ 475,000,000 |  | $ 475,000,000 |  |  |  |  |
Repayment of debt |  |  |  |  | 315,000,000 |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  |  |  | $ 38,000,000 |  |
Long-term debt, gross |  | $ 1,887,000,000 |  |  | $ 1,887,000,000 | $ 1,887,000,000 |  | $ 1,887,000,000 |  |  |  |  |
Senior Notes | AmeriGas Partners Senior Notes | AmeriGas Partners |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  | 5.625% |  |  | 5.625% | 5.625% |  | 5.625% |  |  |  |  |
Aggregate principal balance |  |  |  |  | $ 675,000,000 |  |  |  |  |  |  |  |
Loss on extinguishments of debt |  |  |  |  |  |  | $ 9,000,000 |  |  |  |  |  |
Senior Notes | 5.50 Percent Senior Notes | AmeriGas Partners And AmeriGas Finance Corp. |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  |  |  | 5.50% |  |
Repurchase amount |  |  |  |  |  |  |  |  |  |  | $ 7,000,000 |  |
Senior Notes | 5.875 Percent Senior Notes | AmeriGas Partners And AmeriGas Finance Corp. |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  |  |  | 5.875% |  |
Repurchase amount |  |  |  |  |  |  |  |  |  |  | $ 11,000,000 |  |
Senior Notes | 5.75 Percent Senior Notes | AmeriGas Partners And AmeriGas Finance Corp. |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  |  |  | 5.75% |  |
Repurchase amount |  |  |  |  |  |  |  |  |  |  | $ 13,000,000 |  |
Senior Notes | 9.375 Percent Senior Notes | AmeriGas Partners And AmeriGas Finance Corp. |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  |  |  | 9.375% |  |
Repurchase amount |  |  |  |  |  |  |  |  |  |  | $ 7,000,000 |  |
Senior Notes | UGI Corporation Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  | $ 700,000,000 |  |  | $ 700,000,000 | $ 700,000,000 |  | $ 700,000,000 |  |  |  |  |
Interest rate |  | 5.00% |  |  | 5.00% | 5.00% |  | 5.00% |  |  |  |  |
Proceeds from issuance of notes |  | $ 682,000,000 |  |  |  |  |  |  |  |  |  |  |
Senior Notes | UGI Corporation Senior Notes | Conversion period one |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion price percent |  |  |  |  | 130.00% |  |  |  |  |  |  |  |
Conversion price (in dollars per share) | $ / shares |  | $ 27.60 |  |  | $ 27.60 | $ 27.60 |  | $ 27.60 |  |  |  |  |
Senior Notes | UGI Corporation Senior Notes | Conversion period two |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion price percent |  | 98.00% |  |  |  |  |  |  |  |  |  |  |
Credit Agreement | UGI Utilities 2023 Credit Agreement | Utilities | Revolver |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  | $ 375,000,000
Increase to limit |  |  |  |  |  |  |  |  |  |  |  |  | 125,000,000
Credit Agreement | UGI Utilities 2023 Credit Agreement | Utilities | Letters of credit |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  | 50,000,000
Credit Agreement | UGI Utilities 2023 Credit Agreement | Utilities | Swingline loans |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  | $ 38,000,000
Credit Agreement | Energy Services Term Loan Credit Agreement | Revolver | SOFR |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  | 2.50% |  |  |  |  |  |  |  |  |  |
Credit Agreement | Energy Services Term Loan Credit Agreement | Revolver | SOFR base rate |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  | 1.50% |  |  |  |  |  |  |  |  |  |
Credit Agreement | Energy Services Credit Agreement | Revolver |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  | $ 300,000,000 |  |  |
Credit Agreement | Energy Services Credit Agreement | Letters of credit |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  | $ 50,000,000 |  |  |
Credit Agreement | UGI International 2023 Credit Agreement | Revolver |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Key performance indicators adjustment percentage |  | 0.05% |  |  |  |  |  |  |  |  |  |  |
Credit Agreement | AmeriGas Senior Secured Revolving Credit Facility | Revolver | Subsequent event |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity | $ 200,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Debt term | 5 years |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity, increase limit | $ 150,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Credit Agreement | AmeriGas Senior Secured Revolving Credit Facility | Revolver | SOFR | Subsequent event | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 1.75% |  |  |  |  |  |  |  |  |  |  |  |
Credit Agreement | AmeriGas Senior Secured Revolving Credit Facility | Revolver | SOFR | Subsequent event | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 2.25% |  |  |  |  |  |  |  |  |  |  |  |
Credit Agreement | AmeriGas Senior Secured Revolving Credit Facility | Revolver | SOFR base rate | Subsequent event | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 0.75% |  |  |  |  |  |  |  |  |  |  |  |
Credit Agreement | AmeriGas Senior Secured Revolving Credit Facility | Revolver | SOFR base rate | Subsequent event | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 1.25% |  |  |  |  |  |  |  |  |  |  |  |
Credit Agreement | AmeriGas Senior Secured Revolving Credit Facility | Letters of credit | Subsequent event |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity | $ 20,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Credit Agreement | UGI Corporation Credit Facility Agreement | Revolver |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  | $ 300,000,000 |  |  |  |  |  |  |  |  |
Credit Agreement | UGI Corporation Credit Facility Agreement, Variable-Rate Term Loan 1 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  | $ 215,000,000 |  |  |  |  |  |  |  |  |
Term loan interest rate |  |  |  | 0.375% |  |  |  |  |  |  |  |  |
Credit Agreement | UGI Corporation Credit Facility Agreement, Variable-Rate Term Loan 2 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  | $ 300,000,000 |  |  |  |  |  |  |  |  |
Term loan interest rate |  |  |  | 0.375% |  |  |  |  |  |  |  |  |
Credit Agreement | UGI Corporation Credit Facility Agreement, Variable-Rate Term Loan 3 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  | $ 250,000,000 |  |  |  |  |  |  |  |  |

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