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Debt - Narrative (Details) |  |  |  |  |  |  |  |  |  |  | 1 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 09, 2023 USD ($) | Sep. 20, 2023 USD ($) | May 31, 2023 USD ($) | May 12, 2023 | Apr. 24, 2023 USD ($) | Mar. 31, 2023 USD ($) cure | Mar. 07, 2023 EUR (€) | Feb. 23, 2023 USD ($) | Dec. 13, 2022 USD ($) | Oct. 20, 2022 USD ($) | Jun. 30, 2023 USD ($) | May 31, 2023 USD ($) | Mar. 31, 2023 USD ($) | Oct. 20, 2024 USD ($) | Apr. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Sep. 30, 2021 USD ($) | Nov. 15, 2023 USD ($) | Nov. 14, 2023 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on extinguishments of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 9,000,000 | $ 11,000,000 | $ 0 |  |
Settlement of Energy Services interest rate swap, net of amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (19,000,000) | 0 | $ 0 |  |
Restricted net assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,600,000,000 |  |  |  |
Interest rate swaps |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed rate |  |  |  |  |  | 3.10% |  |  |  |  |  |  | 3.10% |  |  |  |  |  |  |
AmeriGas OLP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 600,000,000 | 600,000,000 |  |  |
Capital contributions |  |  |  |  | $ 11,000,000 | $ 20,000,000 |  |  |  |  |  | $ 52,000,000 |  |  |  |  |  |  |  |
Mountaineer |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 150,000,000 | 100,000,000 |  |  |
Energy Services |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 260,000,000 | 260,000,000 |  |  |
AmeriGas OLP Credit Agreement | AmeriGas OLP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of equity cure | cure |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Energy Services Receivables Facility | Energy Services | Receivables Facility | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100,000,000 | $ 200,000,000 |  |  |  |  |
Line of Credit | Mountaineer | Letter of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,000,000 |  |  |  |
Line of Credit | UGI Utilities Credit Agreement | Utilities | Revolver |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  | $ 425,000,000 |  |  |  |  |  |  |  |  |  |  |
Line of Credit | UGI Utilities Credit Agreement | Utilities | Revolver | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity | $ 375,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase to limit | $ 125,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional automatic extension | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit | UGI Utilities Credit Agreement | Utilities | Revolver | SOFR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  |  | 0.10% |  |  |  |  |  |  |  |  |  |  |
Line of Credit | UGI Utilities Credit Agreement | Utilities | Bridge Loan | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity | $ 38,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit | UGI Utilities Credit Agreement | Utilities | Letter of Credit | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity | $ 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit | AmeriGas OLP Credit Agreement | AmeriGas OLP | Revolver | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 400,000,000 | $ 600,000,000
Line of Credit | AmeriGas OLP Credit Agreement | AmeriGas OLP | Letter of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100,000,000 | $ 100,000,000 |  |  |
Line of Credit | UGI International Credit Facilities Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  | $ 250,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt term |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 | Revolver |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  | $ 300,000,000 |  |  |  |  | € 500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt term |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit | UGI International Credit Facilities Agreement | Revolver | Euro Interbank Offered Rate | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  | 3.35% |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit | UGI International Credit Facilities Agreement | Revolver | Euro Interbank Offered Rate | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  | 1.70% |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit | UGI International Credit Facilities Agreement | Revolver | SOFR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 0.125% |  | 0.10% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit | UGI International Credit Facilities Agreement | Bridge Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity | € |  |  |  |  |  |  | € 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
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 | Revolver |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase to limit |  |  |  |  |  |  |  | $ 125,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  | 800,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Fixed rate |  |  |  |  |  | 4.53% |  |  |  |  |  |  | 4.53% |  |  |  |  |  |  |
Quarterly Installments |  |  |  |  |  |  |  | $ 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Settlement of Energy Services interest rate swap, net of amortization |  |  |  |  |  |  |  |  |  |  |  |  | $ 32,000,000 |  |  |  |  |  |  |
Line of Credit | Energy Services Term Loan Credit Agreement | Revolver | SOFR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  | 3.25% |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit | Energy Services Term Loan Credit Agreement | Revolver | SOFR adjustment rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  | 0.10% |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit | Energy Services Term Loan Credit Agreement | Revolver | SOFR base rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  | 2.25% |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit | Mountaineer Credit Agreement | Mountaineer | Revolver |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  | $ 150,000,000 |  |  |  |  |  |  |  |  |  |
Option to increase capacity |  |  |  |  |  |  |  |  |  | $ 250,000,000 |  |  |  |  |  |  |  |  |  |
Line of Credit | Mountaineer Credit Agreement | Mountaineer | Revolver | SOFR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  |  |  | 1.00% |  |  |  |  |  |  |  |  |  |
Line of Credit | Mountaineer Credit Agreement | Mountaineer | Revolver | SOFR | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  |  |  | 2.25% |  |  |  |  |  |  |  |  |  |
Line of Credit | Mountaineer Credit Agreement | Mountaineer | Revolver | SOFR | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  |  |  | 1.00% |  |  |  |  |  |  |  |  |  |
Line of Credit | Mountaineer Credit Agreement | Mountaineer | Revolver | Federal Funds Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  |  |  | 0.50% |  |  |  |  |  |  |  |  |  |
Line of Credit | Mountaineer Credit Agreement | Mountaineer | Revolver | Base Rate Margin | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  |  |  | 1.25% |  |  |  |  |  |  |  |  |  |
Line of Credit | Mountaineer Credit Agreement | Mountaineer | Revolver | Base Rate Margin | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  |  |  | 0.00% |  |  |  |  |  |  |  |  |  |
Line of Credit | Mountaineer Credit Agreement | Mountaineer | Revolver | One-Month Interest Period (SOFR) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  |  |  | 0.10% |  |  |  |  |  |  |  |  |  |
Line of Credit | Mountaineer Credit Agreement | Mountaineer | Revolver | Three-Month Interest Period (SOFR) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  |  |  | 0.15% |  |  |  |  |  |  |  |  |  |
Line of Credit | Mountaineer Credit Agreement | Mountaineer | Revolver | Six-Month Interest Period (SOFR) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  |  |  | 0.25% |  |  |  |  |  |  |  |  |  |
Line of Credit | Mountaineer Credit Agreement | Mountaineer | Letter of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  | $ 20,000,000 |  |  |  |  |  |  |  |  |  |
UGI Utilities 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% |  |  |  |  |  |  |  |
UGI Utilities Senior Notes: | Senior Notes Due 2028 | AmeriGas Partners And AmeriGas Finance Corp. | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Call premium |  |  | 4.688% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
UGI Utilities Senior Notes: | Senior Notes Due 2028 | AmeriGas Partners And AmeriGas Finance Corp. | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Call premium |  |  | 0.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
UGI Utilities 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 |  |  |  |  |  |  |  |  |

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- Definition Debt Instrument, Covenant, Equity Cure + References No definition available. + Details
Name: | ugi_DebtInstrumentCovenantEquityCure
Namespace Prefix: | ugi_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Debt Instrument, Extension Term + References No definition available. + Details
Name: | ugi_DebtInstrumentExtensionTerm
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