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Accumulated Other Comprehensive Income (Loss) (Tables) | 12 Months Ended
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Sep. 30, 2025
Equity [Abstract] |
Schedule of Changes in AOCI | The tables below present changes in AOCI, net of tax:
| Postretirement Benefit Plans |  | Derivative Instruments |  | Foreign Currency |  | Total
AOCI - September 30, 2022 | $ | 14 |  |  | $ | 37 |  |  | $ | (431) |  |  | $ | (380) |
Other comprehensive income (loss) before reclassification adjustments | 5 |  |  | 16 |  |  | 132 |  |  | 153 |
Amounts reclassified from AOCI | (2) |  |  | (27) |  |  | — |  |  | (29) |
Other comprehensive income (loss) attributable to UGI | 3 |  |  | (11) |  |  | 132 |  |  | 124 |
AOCI - September 30, 2023 | $ | 17 |  |  | $ | 26 |  |  | $ | (299) |  |  | $ | (256) |
Other comprehensive income (loss) before reclassification adjustments | (7) |  |  | (14) |  |  | 56 |  |  | 35 |
Amounts reclassified from AOCI | — |  |  | (35) |  |  | 3 |  |  | (32) |
Other comprehensive income (loss) attributable to UGI | (7) |  |  | (49) |  |  | 59 |  |  | 3 |
AOCI - September 30, 2024 | $ | 10 |  |  | $ | (23) |  |  | $ | (240) |  |  | $ | (253) |
Other comprehensive income (loss) before reclassification adjustments | 13 |  |  | 10 |  |  | 59 |  |  | 82 |
Amounts reclassified from AOCI | — |  |  | (2) |  |  | — |  |  | (2) |
Other comprehensive income (loss) attributable to UGI | 13 |  |  | 8 |  |  | 59 |  |  | 80 |
AOCI - September 30, 2025 | $ | 23 |  |  | $ | (15) |  |  | $ | (181) |  |  | $ | (173) |

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-14A Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 830 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481674/830-30-50-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 830 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 20 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481694/830-30-45-20 + Details
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