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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, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Change in benefit obligations: |  |  |
Benefit obligations — beginning of year | $ 633 | $ 870 |
Service cost | 9 | 16 | $ 12
Interest cost | 35 | 26 | 22
Actuarial gain | (20) | (240) |
Plan amendments | 0 | 1 |
Foreign currency | 2 | (6) |
Benefits paid | (36) | (34) |
Benefit obligations — end of year | 623 | 633 | 870
Change in plan assets: |  |  |
Fair value of plan assets — beginning of year | 541 | 736 |
Actual gain (loss) on plan assets | 31 | (173) |
Foreign currency | 1 | (3) |
Employer contributions | 19 | 15 |
Benefits paid | (36) | (34) |
Fair value of plan assets — end of year | 556 | 541 | $ 736
Funded status of the plans — end of year | (67) | (92) |
Amounts recorded in UGI Corporation stockholders’ equity (pre-tax): |  |  |
Prior service cost | 3 | 3 |
Net actuarial gain | (17) | (17) |
Total | (14) | (14) |
Amounts recorded in regulatory assets and liabilities (pre-tax): |  |  |
Net actuarial loss | 110 | 114 |
Total | 110 | 114 |
ABO for the pension plans | $ 558 | $ 570 |

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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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