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Employee Retirement Plans - Change in Pension Benefits and Other Postretirement Benefits Obligations (Details) - Pension Benefits - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Change in benefit obligations: |  |  |
Benefit obligations — beginning of year | $ 623 | $ 633 |
Service cost | 8 | 9 | $ 16
Interest cost | 36 | 35 | 26
Actuarial loss (gain) | 76 | (20) |
Foreign currency | 2 | 2 |
Benefits paid | (38) | (36) |
Benefit obligations — end of year | 707 | 623 | 633
Change in plan assets: |  |  |
Fair value of plan assets — beginning of year | 556 | 541 |
Actual gain (loss) on plan assets | 118 | 31 |
Foreign currency | 1 | 1 |
Employer contributions | 19 | 19 |
Benefits paid | (37) | (36) |
Fair value of plan assets — end of year | 657 | 556 | $ 541
Funded status of the plans — end of year | (50) | (67) |
Amounts recorded in UGI Corporation stockholders’ equity (pre-tax): |  |  |
Prior service cost | 3 | 3 |
Net actuarial gain | (9) | (17) |
Total | (6) | (14) |
Amounts recorded in regulatory assets and liabilities (pre-tax): |  |  |
Net actuarial loss | 106 | 110 |
Total | 106 | 110 |
ABO for the pension plans | $ 633 | $ 558 |

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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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