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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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- Definition Total costs accrued as of the balance sheet date for environmental loss contingencies. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118942415&loc=d3e14326-108349 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6395460&loc=d3e13647-108346 Reference 3: 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 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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