Property, Plant and Equipment, Net Threshold

No definition available.

Name:	ugi_PropertyPlantAndEquipmentNetThreshold
Namespace Prefix:	ugi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of public utility's approved rate increase (decrease) by regulatory agency.

+ References

No definition available.

+ Details

Name:	us-gaap_PublicUtilitiesApprovedRateIncreaseDecreaseAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of public utility's requested rate increase (decrease) with regulatory agency.

+ References

No definition available.

+ Details

Name:	us-gaap_PublicUtilitiesRequestedRateIncreaseDecreaseAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amortization period for the recovery of regulatory asset, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_RegulatoryAssetAmortizationPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

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.

+ References

No definition available.

+ Details

Name:	us-gaap_RegulatoryAssetLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585

+ Details

Name:	us-gaap_UnrealizedGainLossOnDerivatives
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	dei_LegalEntityAxis=ugi_GasUtilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RegulatoryAgencyAxis=ugi_PennsylvaniaPublicUtilityCommissionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ugi_PublicUtilityRequestedRateIncreaseTermAxis=ugi_PublicUtilityRequestedRateIncreaseTermOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ugi_PublicUtilityRequestedRateIncreaseTermAxis=ugi_PublicUtilityRequestedRateIncreaseTermTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=ugi_ElectricUtilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PublicUtilitiesRegulatoryProceedingAxis=ugi_JointPetitionForApprovalOfSettlementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Utility Regulatory Assets and Liabilities and Regulatory Matters - Narrative (Details) - USD ($) $ in Millions						3 Months Ended		12 Months Ended
	Jan. 28, 2022	Nov. 09, 2021	Feb. 08, 2021	Oct. 08, 2020	Jan. 28, 2020	Dec. 31, 2021	Dec. 31, 2020	Sep. 30, 2021
Regulatory Assets
Net unrealized gains (losses)						$ (397)	$ 96
Gas Utility
Regulatory Assets
Net unrealized gains (losses)						$ 2	$ (1)	$ 35
PAPUC \| Gas Utility
Regulatory Assets
Public utilities, requested rate increase (decrease), amount					$ 75
Public utilities, approved rate increase (decrease), amount				$ 20
Property, plant and equipment, net threshold				$ 2,875
Amortization period				10 years
PAPUC \| Gas Utility \| Beginning January 1, 2021
Regulatory Assets
Public utilities, approved rate increase (decrease), amount				$ 10
PAPUC \| Gas Utility \| Beginning July 1, 2021
Regulatory Assets
Public utilities, approved rate increase (decrease), amount				$ 10
PAPUC \| Gas Utility \| Subsequent event
Regulatory Assets
Public utilities, requested rate increase (decrease), amount	$ 83
PAPUC \| Electric Utility
Regulatory Assets
Public utilities, requested rate increase (decrease), amount			$ 9
PAPUC \| Electric Utility \| Joint Petition
Regulatory Assets
Public utilities, requested rate increase (decrease), amount		$ 6