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Common Stock and Equity-Based Compensation - Narrative (Details) $ / shares in Units, $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Aug. 21, 2019 shares | Jan. 25, 2018 shares | Sep. 30, 2020 USD ($) $ / shares shares | Sep. 30, 2019 USD ($) $ / shares shares | Sep. 30, 2018 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Treasury stock acquired | $ |  |  | $ 49 | $ 16 |
Pre-tax equity-based compensation expense | $ |  |  | 15 | 18 | $ 23
After tax equity-based compensation expense | $ |  |  | 11 | 13 | 16
Cash received from stock option exercises | $ |  |  | 2 | 20 | 43
Associated tax benefits | $ |  |  | 1 | $ 5 | $ 13
Unrecognized compensation cost associated with unvested unit awards | $ |  |  | $ 8 |  |
Weighted-average period of recognition for unvested unit awards |  |  | 1 year 10 months 24 days |  |
UGI Stock Option Awards |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Weighted-average fair value of stock option granted under stock plans (in dollars per share) | $ / shares |  |  | $ 5.58 | $ 8.70 | $ 7.51
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) | $ / shares |  |  | $ 41.85 | $ 55.40 | $ 55.26
Award performance period |  |  | 3 years |  |
Expected term of Performance Unit awards |  |  | 3 years |  |
Expected volatility measurement period (in years) |  |  | 3 years |  |
UGI Units awarded (in shares) |  |  | 222,410 | 29,784 | 52,314
Weighted average grant date fair value unit awards (in dollars per share) | $ / shares |  |  | $ 41.85 |  |
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 | $ |  |  | $ 8 |  |
Weighted-average period of recognition for unvested unit awards |  |  | 2 years |  |
UGI Units awarded (in shares) |  |  | 300,361 | 158,694 | 196,114
Weighted average grant date fair value unit awards (in dollars per share) | $ / shares |  |  | $ 41.50 | $ 55.40 | $ 53.36
UGI Unit awards outstanding (in shares) |  |  | 831,274 | 893,820 |
Fair value of unit awards vested | $ |  |  | $ 5 | $ 5 | $ 7
Liabilities associated with share based compensation | $ |  |  | $ 5 | 10 |
Amerigas Performance Units and Stock Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Conversion ratio | 0.6378 |  |  |  |
AmeriGas Performance Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Units converted to UGI cash-settled restricted units (in shares) | 137,472 |  |  |  |
AmeriGas Stock Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Units converted to UGI cash-settled restricted units (in shares) | 126,089 |  |  |  |
Total Unitholder Return at 25th Percentile | UGI Performance Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Percentage of target award to be granted (as a percentage) |  |  | 25.00% |  |
Total Unitholder Return at 40th Percentile | UGI Performance Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Percentage of target award to be granted (as a percentage) |  |  | 70.00% |  |
Total Unitholder Return at 50th Percentile | UGI Performance Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Percentage of target award to be granted (as a percentage) |  |  | 100.00% |  |
Total Unitholder Return at 90th Percentile | UGI Performance Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Percentage of target award to be granted (as a percentage) |  |  | 200.00% |  |
2010 Propane Plan | UGI Performance Units and Stock Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
UGI Unit awards outstanding (in shares) |  |  | 1,420,949 |  |
2010 Propane Plan | Amerigas Performance Units and Stock Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Award performance period |  |  | 3 years |  |
2010 Propane Plan | Amerigas Performance Units and Stock Units | Minimum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Total unitholder return ranking (as a percentage) |  |  | 0.00% |  |
2010 Propane Plan | Amerigas Performance Units and Stock Units | Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Total unitholder return ranking (as a percentage) |  |  | 200.00% |  |
Common Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Maximum number of shares authorized for repurchase (up to) |  | 8,000,000 |  |  |
Duration of stock repurchase program |  | 4 years |  |  |
Treasury stock acquired | $ |  |  | $ 38 | $ 17 | $ 60
Common Stock | 2013 Omnibus Incentive Compensation Plan (OICP) |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Expiration period |  |  | 10 years |  |
Common Stock awards granted (up to) |  |  | 21,750,000 |  |
Number of common unit awards available for future grant (in shares) |  |  | 6,105,754 |  |
Common Stock | Treasury Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Repurchases of common stock - Treasury (in shares) |  |  | (950,000) | (300,000) | (1,200,000)
AmeriGas Performance Units | Cash Settled Restricted Stock Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Issuance in period due to conversion (in shares) | 215,957 |  |  |  |

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