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Commitments, Guarantees and Contingencies - Clean Water Act and Regulation of Waste Disposal (Details) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2019	Nov. 12, 2019	Nov. 04, 2019	Sep. 30, 2019
Loss Contingencies [Line Items]
Renewal cycle of waste water discharge permit		5 years
Decommissioning fund investments	$ 790,000,000	$ 0
Regulation of Waste Disposal
Loss Contingencies [Line Items]
Accrual for environmental loss contingencies		109,000,000
Environmental liabilities former gas facilities		77,000,000
Nuclear Plant Matters
Loss Contingencies [Line Items]
Decommissioning fund investments		882,000,000
TMI-2
Loss Contingencies [Line Items]
Increase in asset retirement obligation	$ 172,000,000
Line of Credit | Surety Bond | Little Bull Run
Loss Contingencies [Line Items]
Maximum amount borrowed under revolving credit facility		169,000,000
Line of Credit | Surety Bond | Hatfield Ferry
Loss Contingencies [Line Items]
Maximum amount borrowed under revolving credit facility		$ 31,000,000
Financial Guarantee | JCP&L, ME, PN and GPUN | Nuclear Plant Matters
Loss Contingencies [Line Items]
Decommissioning fund investments					$ 900,000,000
Ownership interest			25.00%
EPA | Clean Water Act
Loss Contingencies [Line Items]
Proposed penalty				$ 1,300,000

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Decommission fund to pay for the costs of decontaminating and decommissioning of facilities through collection of revenues derived from utility assessments and government appropriations. Decommission fund investment for the process whereby a power station, at the end of its economic life, is taken permanently out of service and its site made available for other purposes. In the case of a nuclear station this comprises three different states of clearance. Immediately after the final closure, radioactive material such as nuclear fuel and operational waste is removed and the buildings surrounding the reactor shield are dismantled and finally the reactor itself is dismantled.

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