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ORGANIZATION AND BASIS OF PRESENTATION - Narrative (Details) customer in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 USD ($) mi² entity customer transmission_center agreement company MW shares | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($) MW shares | Jun. 30, 2013 USD ($)
Regulatory Assets [Line Items] |  |  |  |
Concentration of risk of accounts receivable | $ 0 | $ 0 |  |
Increase (decrease) in allowance for credit loss, | 121,000,000 |  |  |
Regulatory assets based on prior precedent or anticipated recovery based on rate making premises with specific order | 117,000,000 | 111,000,000 |  |
Regulatory assets being sought for recovery in a formula rate amendment | $ 79,000,000 | $ 73,000,000 |  |
Annual composite depreciation rate | 2.70% | 2.70% | 2.60% |
Capitalized financing costs | $ 49,000,000 | $ 45,000,000 | $ 46,000,000 |
Interest costs capitalized | 28,000,000 | 26,000,000 | 19,000,000 |
Property, plant and equipment | $ 33,294,000,000 | 31,650,000,000 |  |
Number of contracts that may contain variable interest | entity | 1 |  |  |
Purchased power | $ 2,701,000,000 | 2,927,000,000 | $ 3,109,000,000 |
Number of regional transmission centers | transmission_center | 2 |  |  |
Regulatory assets currently being recovered through deferred returns | $ 195,000,000 | 228,000,000 |  |
Power Purchase Agreements |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Ownership interest | 0.00% |  |  |
Number of long term power purchase agreements maintained by parent company with Non utility generation entities | agreement | 6 |  |  |
Global Holding |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Equity method investments | $ 30,000,000 |  |  |
Path-WV | Variable Interest Entity, Not Primary Beneficiary |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Equity method investments | $ 18,000,000 |  |  |
Percentage of high-voltage transmission line project owned by subsidiary of FE on the Allegheny Series | 100.00% |  |  |
Percentage of high-voltage transmission line project owned by subsidiary of AE on the West Virginia Series | 50.00% |  |  |
Phase In Recovery Bonds |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Long-term debt and other long-term obligations | $ 245,000,000 | 268,000,000 |  |
Line of Credit | Term Loan Facility Due March 2020 | Global Holding |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Face amount of loan | 120,000,000 |  |  |
Line of Credit | Revolving Credit Facility |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Maximum amount borrowed under revolving credit facility | $ 3,500,000,000 |  |  |
Ohio Funding Companies | Phase In Recovery Bonds |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Face amount of loan |  |  |  | $ 445,000,000
FEV | Signal Peak | Global Holding |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Ownership interest | 33.33% |  |  |
Global Holding | Senior Loans | Senior Secured Term Loan |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Long-term debt and other long-term obligations | $ 108,000,000 |  |  |
Other FE subsidiaries | Power Purchase Agreements |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Purchased power | $ 113,000,000 | $ 116,000,000 |  |
Bath County, Virginia |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Plant generation capacity (in MW's) | MW | 3,003 |  |  |
Bath County, Virginia | AGC |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Proportionate ownership share | 16.25% |  |  |
Plant generation capacity (in MW's) | MW | 487 |  |  |
Property, plant and equipment | $ 157,000,000 |  |  |
Bath County, Virginia | Virginia Electric and Power Company |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Proportionate ownership share | 60.00% |  |  |
Utilities and FET |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Property, plant and equipment, net | $ 2,100,000,000 |  |  |
Plant generation capacity (in MW's) | MW | 3,790 |  |  |
Number of existing utility operating companies | company | 10 |  |  |
Number of customers served by utility operating companies | customer | 6 |  |  |
Service Area | mi² | 65,000 |  |  |
Utilities and FET | Yard's Creek Energy, LLC Hydro Generation Facility |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Plant generation capacity (in MW's) | MW | 210 |  |  |
Regulated Transmission |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Service Area | mi² | 24,500 |  |  |
Pleasants Power Station | AE Supply | Purchase Agreement with Subsidiary of LS Power |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Plant generation capacity (in MW's) | MW |  |  | 1,300 |
Disposal Group, Held-for-sale | TMI-2 | Utilities and FET |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Assets held-for-sale | $ 882,000,000 |  |  |
Stock Options |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Antidilutive securities excluded from computation of EPS (in shares) | shares | 80,000 | 0 | 1,000,000 |
Future Recovery of Incremental Costs |  |  |  |
Regulatory Assets [Line Items] |  |  |  |
Increase (decrease) in allowance for credit loss, | $ 90,000,000 |  |  |

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