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Common Stock and Equity-Based Compensation - Stock Option Awards (Details) - UGI Stock Option Awards - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Shares |  |  |  |
Shares under option - beginning balance (in shares) | 8,478,105 | 8,197,069 | 8,781,748 |
Granted (in shares) | 1,893,700 | 1,197,100 | 1,401,400 |
Canceled (in shares) | (57,668) | (123,012) | (152,017) |
Expired (in shares) | (93,728) | (13,699) | (1,666) |
Exercised (in shares) | (230,875) | (779,353) | (1,832,396) |
Shares under option - ending balance (in shares) | 9,989,534 | 8,478,105 | 8,197,069 | 8,781,748
Weighted - Average Option Price |  |  |  |
Shares under option - beginning balance (in dollars per share) | $ 37.18 | $ 33.93 | $ 30.20 |
Granted (in dollars per share) | 43.20 | 53.27 | 47.85 |
Canceled (in dollars per share) | 49.69 | 48.69 | 42.14 |
Expired (in dollars per share) | 37.81 | 47.49 | 35.80 |
Exercised (in dollars per share) | 22.65 | 25.75 | 26.00 |
Shares under option - ending balance (in dollars per share) | $ 38.58 | $ 37.18 | $ 33.93 | $ 30.20
Total Intrinsic Value |  |  |  |
Shares under option - beginning balance | $ 115 | $ 177 | $ 147 |
Exercised | 3 | 23 | 45 |
Shares under option - beginning balance | $ 26 | $ 115 | $ 177 | $ 147
Weighted - Average Contract Term (Years) |  |  |  |
Weighted - Average Contract Term (Years) | 5 years 9 months 18 days | 5 years 10 months 24 days | 6 years 2 months 12 days | 6 years 3 months 18 days
Options Exercisable |  |  |  |
Options exercisable (in shares) | 6,898,251 | 5,963,530 | 5,498,330 |
Weighted - Average Option Price (in dollars per share) | $ 35.06 | $ 32.02 | $ 28.63 |
Total Intrinsic Value | $ 26 |  |  |
Weighted - Average Contract Term (Years) | 4 years 6 months |  |  |
Options Not Exercisable |  |  |  |
Options not exercisable (in shares) | 3,091,283 |  |  |
Weighted - Average Option Price (in dollars per share) | $ 46.45 |  |  |
Total Intrinsic Value | $ 0 |  |  |
Weighted - Average Contract Term (Years) | 8 years 7 months 6 days |  |  |

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