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Equity-Based Compensation - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions |  | 12 Months Ended
--- | --- | ---
Jan. 29, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Pre-tax equity-based compensation expense |  | $ 15 | $ 21 | $ 15
After tax equity-based compensation expense |  | $ 11 | $ 15 | $ 11
Weighted-average fair value of stock option granted under stock plans (in dollars per share) |  | $ 8.47 | $ 6.05 | $ 5.58
Options outstanding (in shares) |  | 9,004,896 |  |
Options exercisable (in shares) |  | 7,179,583 |  |
Weighted average exercise price (in dollars per share) |  | $ 42.23 |  |
UGI Stock Option Awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Unrecognized compensation cost associated with unvested unit awards |  | $ 5 |  |
Weighted-average period of recognition for unvested unit awards |  | 1 year 9 months 18 days |  |
UGI Performance Units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Weighted-average fair value of stock option granted under stock plans (in dollars per share) |  | $ 51.24 | $ 41.41 | $ 41.47
Award performance period |  | 3 years |  |
UGI Performance Units | Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Percentage of target award to be granted (as a percentage) |  | 0.00% |  |
UGI Performance Units | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Percentage of target award to be granted (as a percentage) |  | 200.00% |  |
UGI Performance Units and Stock Units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Unrecognized compensation cost associated with unvested unit awards |  | $ 24 |  |
Weighted-average period of recognition for unvested unit awards |  | 2 years |  |
UGI Unit awards outstanding (in shares) |  | 1,376,371 |  |
Weighted average grant date fair value, outstanding (in dollars per share) |  | $ 42.31 |  |
Common Stock | 2021 IAP |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Common Stock awards granted (up to) (in shares) | 20,500,000 |  |  |
Expiration period | 10 years |  |  |
Number of common unit awards available for future grant (in shares) |  | 18,015,916 |  |

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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(ii) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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