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- Definition

Amount of power (in megawatts) contracted to purchase as part of the first solicitation required by the Rhode Island Long-Term Contracting Standard.

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- Definition

Number of customers impacted by Aquidneck Island loss of gas supply

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- Definition

Period over which Distribution Adjustment Charge-related qualified remediation costs are amortized.

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- Definition

Initial ownership percentage in new company, Talen Energy, by Riverstone Holdings, LLC upon completion of spinoff transaction.

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- Definition

Undiscounted amount of the accrual for environmental loss contingencies.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 30
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 5.Y.Q1)
-URI http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751

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- Definition

Undiscounted amount of accrual for environmental loss contingency to be paid in remainder of current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

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- Definition

Amount of any recovery from third parties that is credited to environmental remediation costs.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 30
-Section 50
-Paragraph 12
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13296-110859

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- Definition

The charge against earnings in the period for known or estimated future costs arising from requirements to perform environmental remediation activities.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 30
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=109237650&loc=d3e13064-110858

Reference 2: http://www.xbrl.org/2003/role/recommendedDisclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 30
-Section 50
-Paragraph 12
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13296-110859

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Commitments and Contingencies - Legal Matters and Regulatory Issues (Details) $ in Millions	1 Months Ended	6 Months Ended	12 Months Ended
	Jan. 31, 2019 customers	Jun. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)	Jun. 01, 2015	Jul. 01, 2011 MW
Claim By Former Affiliate [Abstract]
Percent of ownership of Talen Energy by Riverstone				35.00%
LTCS Renewable Energy Contract, First Solicitation, Power \| MW					3.2
Period Over Which Distribution Adjustment Charge-related Costs Are amortized		10 years
Number of customers impacted by Aquidneck Island loss of gas supply \| customers	7,500
Environmental Remediation Expense			$ 7
Electric Rates
Claim By Former Affiliate [Abstract]
Environmental Costs Recognized, Recovery Credited to Expense		$ 3
Gas Rates
Claim By Former Affiliate [Abstract]
Environmental Costs Recognized, Recovery Credited to Expense		1
RIE Environmental Remediation
Claim By Former Affiliate [Abstract]
Accrual for Environmental Loss Contingency, Undiscounted, to be Paid, Remainder of Fiscal Year		8
Accrual for Environmental Loss Contingencies, Gross		101
PPL Electric [Member] \| PPL Electric Additional Sites [Member]
Claim By Former Affiliate [Abstract]
Accrual for Environmental Loss Contingencies, Gross		10	10
PPL Electric Utilities Corp [Member] \| PPL Electric Additional Sites [Member]
Claim By Former Affiliate [Abstract]
Accrual for Environmental Loss Contingencies, Gross		$ 10	$ 10