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Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Target Award to be Granted

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Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Upon Conversion

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Share-based Compensation Arrangement by Share-based Payment Award, Percentage Modification Based on Total Unitholder Return Ranking

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Share-based Compensation Arrangement by Share-based Payment Award, Award Performance Period

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Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Converted In Period

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Share-based Compensation Arrangement by Share-based Payment Award, Volatility Measurement Period Of Common Stock

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Amount, after tax, of expense for award under share-based payment arrangement.

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Aggregate carrying value as of the balance sheet date of the liabilities for stock option plans and other equity-based compensation arrangements.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of tax benefit from exercise of option under share-based payment arrangement.

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Amount of cash inflow from exercise of option under share-based payment arrangement.

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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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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.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Number of shares authorized for issuance under share-based payment arrangement.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

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Period which shares may be purchased under a stock repurchase plan authorized by an entity's Board of Directors, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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The amount allocated to treasury stock. Treasury stock is common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury.

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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