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SCHEDULE I — CONDENSED FINANCIAL INFORMATION OF REGISTRANT (PARENT COMPANY) - BALANCE SHEETS (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
--- | --- | --- | --- | ---
Current assets |  |  |  |
Cash and cash equivalents | $ 336 | $ 447 | $ 452 | $ 558
Prepaid expenses and other current assets | 59 | 68 |  |
Total current assets | 1,543 | 1,566 |  |
Other assets | 854 | 498 |  |
Total assets | 13,985 | 13,347 | $ 11,981 |
Current liabilities |  |  |  |
Current maturities of long-term debt | 53 | 24 |  |
Total current liabilities | 1,755 | 2,028 |  |
Long-term debt | 5,981 | 5,780 |  |
Other noncurrent liabilities | 1,413 | 1,123 |  |
Total liabilities | 9,848 | 9,520 |  |
Commitments and contingencies (Note 1) |  |  |  |
Common stockholders’ equity: |  |  |  |
Common Stock, without par value (authorized – 450,000,000 shares; issued – 209,514,044 and 209,304,129 shares, respectively) | 1,416 | 1,397 |  |
Retained earnings | 2,908 | 2,653 |  |
Accumulated other comprehensive loss | (147) | (217) |  |
Treasury stock, at cost | (49) | (16) |  |
Total UGI Corporation stockholders’ equity | 4,128 | 3,817 |  |
Total liabilities and equity | $ 13,985 | $ 13,347 |  |
Condensed Financial Information of Registrant [Abstract] |  |  |  |
Common stock, shares authorized (in shares) | 450,000,000 | 450,000,000 |  |
Common stock, shares issued (in shares) | 209,514,044 | 209,304,129 |  |
Parent Company |  |  |  |
Current assets |  |  |  |
Cash and cash equivalents | $ 67 | $ 54 |  |
Accounts receivable – related parties | 11 | 5 |  |
Prepaid expenses and other current assets | 15 | 23 |  |
Total current assets | 93 | 82 |  |
Property, plant and equipment, net | 2 | 3 |  |
Investments in subsidiaries | 4,898 | 4,585 |  |
Other assets | 87 | 77 |  |
Total assets | 5,080 | 4,747 |  |
Current liabilities |  |  |  |
Current maturities of long-term debt | 30 | 0 |  |
Accounts and notes payable | 15 | 15 |  |
Accrued liabilities | 29 | 9 |  |
Total current liabilities | 74 | 24 |  |
Long-term debt | 817 | 846 |  |
Other noncurrent liabilities | 61 | 60 |  |
Total liabilities | 952 | 930 |  |
Commitments and contingencies (Note 1) |  |  |  |
Common stockholders’ equity: |  |  |  |
Common Stock, without par value (authorized – 450,000,000 shares; issued – 209,514,044 and 209,304,129 shares, respectively) | 1,416 | 1,397 |  |
Retained earnings | 2,908 | 2,653 |  |
Accumulated other comprehensive loss | (147) | (217) |  |
Treasury stock, at cost | (49) | (16) |  |
Total UGI Corporation stockholders’ equity | 4,128 | 3,817 |  |
Total liabilities and equity | $ 5,080 | $ 4,747 |  |
Condensed Financial Information of Registrant [Abstract] |  |  |  |
Common stock, shares issued (in shares) | 209,514,044 | 209,304,129 |  |

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