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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, 2022 | Sep. 30, 2021 | Sep. 30, 2020
Change in benefit obligations: |  |  |
Benefit obligations — beginning of year | $ 870 | $ 782 |
Service cost | 16 | 12 | $ 11
Interest cost | 26 | 22 | 23
Actuarial gain | (240) | (30) |
Plan amendments | 1 | 2 |
Acquisitions | 0 | 114 |
Foreign currency | (6) | (1) |
Benefits paid | (34) | (31) |
Benefit obligations — end of year | 633 | 870 | 782
Change in plan assets: |  |  |
Fair value of plan assets — beginning of year | 736 | 585 |
Actual (loss) gain on plan assets | (173) | 75 |
Foreign currency | (3) | 0 |
Employer contributions | 15 | 14 |
Acquisitions | 0 | 92 |
Benefits paid | (34) | (30) |
Fair value of plan assets — end of year | 541 | 736 | $ 585
Funded status of the plans — end of year | (92) | (134) |
Amounts recorded in UGI Corporation stockholders’ equity (pre-tax): |  |  |
Prior service cost | 3 | 3 |
Net actuarial (gain) loss | (17) | 13 |
Total | (14) | 16 |
Amounts recorded in regulatory assets and liabilities (pre-tax): |  |  |
Net actuarial loss | 114 | 108 |
Total | 114 | 108 |
ABO for the pension plans | $ 570 | $ 756 |

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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