Income Taxes	3 Months Ended
Income Taxes	Mar. 31, 2021
Income Tax Disclosure [Abstract]
INCOME TAXES	INCOME TAXES FirstEnergy’s interim effective tax rates reflect the estimated annual effective tax rates for 2021 and 2020. These tax rates are affected by estimated annual permanent items, such as AFUDC equity and other flow-through items, as well as discrete items that may occur in any given period but are not consistent from period to period. FirstEnergy’s effective tax rate on continuing operations for the three months ended March 31, 2021 and 2020, was 20.6% and 166.7%, respectively. The change in effective tax rate was primarily due to the absence of a $52 million reduction in valuation allowances in the first quarter of 2020 from the recognition of deferred gains on prior intercompany generation asset transfers triggered by the FES Debtors’ emergence from bankruptcy and deconsolidation from FirstEnergy’s consolidated federal income tax group. See Note 3, “Discontinued Operations,” for other tax matters relating to the FES Bankruptcy that were recognized in discontinued operations. During the three months ended March 31, 2021, FirstEnergy recorded a $11 million increase in its reserve for uncertain tax positions for benefits related to certain federal tax credits. As of March 31, 2021, it is reasonably possible that within the next twelve months FirstEnergy could record a net decrease of approximately $57 million to its reserve for uncertain tax positions due to the expiration of the statute of limitations or resolution with taxing authorities, of which approximately $55 million would impact FirstEnergy’s effective tax rate. On March 11, 2021, President Biden signed into law the American Rescue Plan Act of 2021. While the Act is primarily an economic stimulus package, it also, among other changes, expanded the scope of Section 162(m) of the Internal Revenue Code that limits deductions on certain executive officer compensation. FirstEnergy does not currently expect these changes to have a material impact. During January 2021, the IRS issued additional regulations on interest expense deductibility under Section 163(j) of the Internal Revenue Code, however, is not expected to have a significant tax impact to FirstEnergy.

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.