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Debt (Details) |  |  |  |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended
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May 31, 2023 USD ($) | May 12, 2023 | Apr. 24, 2023 USD ($) | Mar. 31, 2023 USD ($) | Mar. 07, 2023 EUR (€) | Mar. 01, 2023 USD ($) | Feb. 23, 2023 USD ($) | Dec. 13, 2022 USD ($) | Oct. 20, 2022 USD ($) | Jun. 30, 2023 USD ($) | May 31, 2023 USD ($) | Jun. 30, 2023 USD ($) cure | Jun. 30, 2022 USD ($) | Jun. 30, 2023 USD ($) cure | Jun. 30, 2022 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on extinguishments of debt |  |  |  |  |  |  |  |  |  |  |  | $ (9,000,000) | $ 0 | $ (9,000,000) | $ (11,000,000)
Settlement of Energy Services interest rate swap |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (32,000,000) | $ 0
Interest rate swaps |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed rate |  |  |  | 3.10% |  |  |  |  |  |  |  |  |  |  |
AmeriGas OLP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital contributions |  |  | $ 11,000,000 | $ 20,000,000 |  |  |  |  |  |  | $ 52,000,000 |  |  |  |
2022 AmeriGas OLP Credit Agreement | AmeriGas OLP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Permitted usage of equity cure provision | cure |  |  |  |  |  |  |  |  |  |  |  | 5 |  |  |
Number of equity cure | cure |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |
Senior Notes | Senior Notes Due 2028 | AmeriGas Partners And AmeriGas Finance Corp. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount | $ 500,000,000 |  |  |  |  |  |  |  |  |  | $ 500,000,000 |  |  |  |
Interest rate | 9.375% |  |  |  |  |  |  |  |  |  | 9.375% |  |  |  |
Senior Notes | Senior Notes Due 2028 | AmeriGas Partners And AmeriGas Finance Corp. | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Call premium | 4.688% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes | Senior Notes Due 2028 | AmeriGas Partners And AmeriGas Finance Corp. | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Call premium | 0.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes | AmeriGas Partners Senior Notes | AmeriGas Partners And AmeriGas Finance Corp. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount | $ 675,000,000 |  |  |  |  |  |  |  |  |  | $ 675,000,000 |  |  |  |
Interest rate | 5.625% |  |  |  |  |  |  |  |  |  | 5.625% |  |  |  |
Repayment of debt | $ 150,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on extinguishments of debt |  |  |  |  |  |  |  |  |  | $ (9,000,000) |  |  |  |  |
Line of Credit | UGI International Credit Facilities Agreement | Unsecured Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount | € |  |  |  |  | € 300,000,000 |  |  |  |  |  |  |  |  |  |
Debt term |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |
Line of Credit | UGI International Credit Facilities Agreement | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity | € |  |  |  |  | € 500,000,000 |  |  |  |  |  |  |  |  |  |
Line of Credit | UGI International Credit Facilities Agreement | Revolving Credit Facility | Euro Interbank Offered Rate | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  | 3.35% |  |  |  |  |  |  |  |  |  |
Line of Credit | UGI International Credit Facilities Agreement | Revolving Credit Facility | Euro Interbank Offered Rate | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  | 1.70% |  |  |  |  |  |  |  |  |  |
Line of Credit | UGI International Credit Facilities Agreement | Bridge Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity | € |  |  |  |  | € 100,000,000 |  |  |  |  |  |  |  |  |  |
Consolidated net leverage ratio |  |  |  |  | 3.85 |  |  |  |  |  |  |  |  |  |
Line of Credit | UGI International Credit Facilities Agreement | Bridge Loan | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated net leverage ratio |  |  |  |  | 4.25 |  |  |  |  |  |  |  |  |  |
Line of Credit | UGI International Credit Facilities Agreement | Bridge Loan | Daily Non-cumulative Compounded Reference Rate | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  | 3.35% |  |  |  |  |  |  |  |  |  |
Line of Credit | UGI International Credit Facilities Agreement | Bridge Loan | Daily Non-cumulative Compounded Reference Rate | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  | 1.35% |  |  |  |  |  |  |  |  |  |
Line of Credit | UGI Energy Services Credit Agreement | SOFR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 0.10% |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit | Energy Services Term Loan Credit Agreement | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  | $ 800,000,000 |  |  |  |  |  |  |  |
Fixed rate |  |  |  | 4.53% |  |  |  |  |  |  |  |  |  |  |
Increase to limit |  |  |  |  |  |  | 125,000,000 |  |  |  |  |  |  |  |
Quarterly installments |  |  |  |  |  |  | $ 2,000,000 |  |  |  |  |  |  |  |
Settlement of Energy Services interest rate swap |  |  |  |  |  | $ 32,000,000 |  |  |  |  |  |  |  |  |
Line of Credit | Energy Services Term Loan Credit Agreement | Revolving Credit Facility | SOFR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  | 3.25% |  |  |  |  |  |  |  |
Line of Credit | Energy Services Term Loan Credit Agreement | Revolving Credit Facility | SOFR adjustment rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  | 0.10% |  |  |  |  |  |  |  |
Line of Credit | Energy Services Term Loan Credit Agreement | Revolving Credit Facility | SOFR base rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  | 2.25% |  |  |  |  |  |  |  |
Line of Credit | UGI Utilities Credit Agreement | Utilities | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  | $ 425,000,000 |  |  |  |  |  |  |
Line of Credit | UGI Utilities Credit Agreement | Utilities | Revolving Credit Facility | SOFR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  | 0.10% |  |  |  |  |  |  |
Line of Credit | Mountaineer Credit Agreement | Mountaineer | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  | $ 150,000,000 |  |  |  |  |  |
Option to increase capacity |  |  |  |  |  |  |  |  | $ 250,000,000 |  |  |  |  |  |
Line of Credit | Mountaineer Credit Agreement | Mountaineer | Revolving Credit Facility | SOFR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  |  | 1.00% |  |  |  |  |  |
Line of Credit | Mountaineer Credit Agreement | Mountaineer | Revolving Credit Facility | SOFR | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  |  | 2.25% |  |  |  |  |  |
Line of Credit | Mountaineer Credit Agreement | Mountaineer | Revolving Credit Facility | SOFR | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  |  | 1.00% |  |  |  |  |  |
Line of Credit | Mountaineer Credit Agreement | Mountaineer | Revolving Credit Facility | Federal Funds Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  |  | 0.50% |  |  |  |  |  |
Line of Credit | Mountaineer Credit Agreement | Mountaineer | Revolving Credit Facility | Base Rate Margin | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  |  | 1.25% |  |  |  |  |  |
Line of Credit | Mountaineer Credit Agreement | Mountaineer | Revolving Credit Facility | Base Rate Margin | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  |  | 0.00% |  |  |  |  |  |
Line of Credit | Mountaineer Credit Agreement | Mountaineer | Revolving Credit Facility | One-Month Interest Period (SOFR) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  |  | 0.10% |  |  |  |  |  |
Line of Credit | Mountaineer Credit Agreement | Mountaineer | Revolving Credit Facility | Three-Month Interest Period (SOFR) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  |  | 0.15% |  |  |  |  |  |
Line of Credit | Mountaineer Credit Agreement | Mountaineer | Revolving Credit Facility | Six-Month Interest Period (SOFR) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  |  | 0.25% |  |  |  |  |  |
Line of Credit | Mountaineer Credit Agreement | Mountaineer | Letters of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  | $ 20,000,000 |  |  |  |  |  |
Line of Credit | UGI Corporation Credit Agreement | Revolving Credit Facility | SOFR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 0.10% |  |  |  |  |  |  |  |  |  |  |  |  |

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