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Total renewable energy capacity (in megawatts) required meet the Rhode Island Long-Term Contracting Standard.

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Claim By Former Affiliate [Abstract]

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Amount of power (in megawatts) contracted to purchase as part of the Deepwater Agreement.

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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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LTCS Renewable Energy Contract, Offshore Wind Energy Procurement, Power

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

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

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LTCS Renewable Energy Contract, Three-State Procurement, Power

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Total renewable energy capacity (in megawatts) required to be contracted under the Rhode Island Long-Term Contracting Standard.

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

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Unrecorded Unconditional Purchase Obligation, to be Paid, Years Four and Five

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Unrecorded Unconditional Purchase Obligation, to be Paid, Years Two and Three

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- Definition

Total costs accrued as of the balance sheet date for environmental loss contingencies.

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The cash inflow associated with the amount received from the sale of a business segment or subsidiary or sale of an entity that is related to it but not strictly controlled during the period (for example, an unconsolidated subsidiary, affiliate, joint venture or equity method investment).

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Amount of fixed and determinable portion of unrecorded unconditional purchase obligation to be paid in fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of fixed and determinable portion of unrecorded unconditional purchase obligation to be paid in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of fixed and determinable portion of unrecorded unconditional purchase obligation to be paid in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of fixed and determinable portion of unrecorded unconditional purchase obligation to be paid in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of fixed and determinable portion of unrecorded unconditional purchase obligation to be paid in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of the unrecorded obligation to transfer funds in the future for fixed or minimum amounts or quantities of goods or services at fixed or minimum prices (for example, as in take-or-pay contracts or throughput contracts).

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Amount of fixed and determinable portion of unrecorded unconditional purchase obligation to be paid after fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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The amount purchased during the period under an unrecorded unconditional purchase obligation (for example, under the take-or-pay or throughput contract).

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Commitments and Contingencies (Energy Purchases, Energy Sales, Other Commitments and Legal Matters) (Details) $ in Millions		12 Months Ended
	Nov. 18, 2014 USD ($)	Dec. 31, 2022 USD ($) MW	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Jul. 01, 2022 MW	Dec. 06, 2018 MW	Apr. 09, 2018 MW	Oct. 01, 2015 MW	Jun. 01, 2015	Dec. 31, 2014 MW	May 01, 2012 MW	Jul. 01, 2011 MW	Jun. 30, 2010 MW
Claim By Former Affiliate [Abstract]
Restructuring And Related Activities Ownership Percentage By Riverstone									35.00%
Proceeds from Divestiture of Businesses and Interests in Affiliates	$ 900
Legal Matters - Cane Run Environmental Claims (Numeric) [Abstract]
LTCS Renewable Energy Contract, Deepwater Agreement, Power \| MW													30
LTCS Renewable Energy Contract, Three-State Procurement, Power \| MW							36.75
LTCS Renewable Energy Contract, Offshore Wind Energy Procurement, Power \| MW						408
LTCS Renewable Energy Contracting Capacity Requirement \| MW										90
LTCS Renewable Energy Contract, First Solicitation, Power \| MW												3.2
LTCS Renewable Energy Contract, Second Solicitation, Power \| MW											3.9
LTCS Renewable Energy Contract, Third Solicitation, Power \| MW								80
Amount of MW Required to Meet LTCS Renewable Energy Contracting Capacity Requirement \| MW		12
Minimum [Member]
Legal Matters - Cane Run Environmental Claims (Numeric) [Abstract]
ACES Renewable Energy Contracting Capacity Requirement \| MW					600
Maximum [Member]
Legal Matters - Cane Run Environmental Claims (Numeric) [Abstract]
ACES Renewable Energy Contracting Capacity Requirement \| MW					1,000
Power Purchase [Member]
Energy Purchase Commitments (Numeric) [Abstract]
2023		$ 34
2024		32
2025		32
2026		32
2027		32
Thereafter		265
Total		427
Purchases		30	$ 19	$ 18
Rhode Island Energy \| Power Purchase [Member]
Energy Purchase Commitments (Numeric) [Abstract]
2023		471
Thereafter		279
Total		995
Legal Matters - Cane Run Environmental Claims (Numeric) [Abstract]
2024-2025		172
2026-2027		73
Louisville Gas And Electric Co [Member] \| Power Purchase [Member]
Energy Purchase Commitments (Numeric) [Abstract]
2023		24
2024		22
2025		22
2026		22
2027		22
Thereafter		184
Total		296
Purchases		21	13	12
Kentucky Utilities Co [Member] \| Power Purchase [Member]
Energy Purchase Commitments (Numeric) [Abstract]
2023		10
2024		10
2025		10
2026		10
2027		10
Thereafter		81
Total		131
Purchases		9	6	$ 6
PPL Electric Additional Sites [Member] \| PPL Electric [Member]
Legal Matters - Cane Run Environmental Claims (Numeric) [Abstract]
Accrual for Environmental Loss Contingencies		11	10
PPL Electric Additional Sites [Member] \| PPL Electric Utilities Corp [Member]
Legal Matters - Cane Run Environmental Claims (Numeric) [Abstract]
Accrual for Environmental Loss Contingencies		$ 11	$ 10