GENERAL	6 Months Ended
GENERAL	Jun. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
GENERAL	GENERAL ITC Holdings and its subsidiaries are engaged in the transmission of electricity in the United States. Through our Regulated Operating Subsidiaries, we own and operate high-voltage electric transmission systems in Michigan’s Lower Peninsula and portions of Iowa, Minnesota, Illinois, Missouri, Kansas and Oklahoma that transmit electricity from generating stations to local distribution facilities connected to our transmission systems. ITC Holdings is a wholly-owned subsidiary of ITC Investment Holdings. Basis of Presentation These condensed consolidated interim financial statements should be read in conjunction with the notes to the consolidated financial statements as of and for the year ended December 31, 2019 included in ITC Holdings’ annual report on Form 10-K for such period. The accompanying condensed consolidated interim financial statements have been prepared using GAAP and with the instructions to Form 10-Q and Rule 10-01 of SEC Regulation S-X as they apply to interim financial information. Accordingly, they do not include all of the information and notes required by GAAP for complete financial statements. These accounting principles require us to use estimates and assumptions that impact the reported amounts of assets, liabilities, revenues and expenses, and the disclosure of contingent assets and liabilities. Actual results may differ from our estimates. The condensed consolidated interim financial statements are unaudited but, in our opinion, include all adjustments (consisting of normal recurring adjustments) necessary for a fair statement of the results for the interim period. The interim financial results are not necessarily indicative of results that may be expected for any other interim period or the fiscal year. Recent Developments Regarding the COVID-19 Pandemic In March 2020, the World Health Organization declared COVID-19 a pandemic. Efforts to control the recent outbreak of COVID-19 have resulted in impacts to businesses and facilities in various industries around the world, such as operating restrictions and closures, and disruptions to the global economy and supply chains. The COVID-19 pandemic has and will continue to impact our customers throughout our operating footprint. To date, COVID-19 has not had a material impact on our net income. However, we have implemented various temporary cost saving measures related to operating expenses, including operation and maintenance expenses and general and administrative expenses, in an attempt to reduce costs that are collected from customers through our Formula Rates. The duration of COVID-19 and the extent of such impact on our operations is unknown at this time. We are continuing to monitor developments involving our workforce, customers and suppliers and cannot predict whether COVID-19 will have a material impact on our consolidated results of operations, cash flows or financial condition. We continue to monitor the rapidly evolving situation and guidance from federal, state and local public health authorities. We are taking steps to mitigate the potential risks to us posed by COVID-19 and are following all government requirements to reduce the transmission of COVID-19. Monthly Network Peak Load For our MISO Regulated Operating Subsidiaries, monthly network peak loads are used for billing network revenues, which currently is the largest component of our operating revenues. One of the primary factors that impacts our collection of revenues is actual monthly network peak load, which is impacted by a number of factors including network usage and weather. Although monthly network peak loads do not impact our recognition of operating revenues, actual network load affects the timing of collection of our cash flows from transmission service. During March and April of 2020, the period of most significant business disruption to date, actual monthly network peak load for our MISO Regulated Operating Subsidiaries was down ranging from as much as 9% to 26% across each of the operating companies as compared to pre-COVID-19 forecasted load. This decrease was primarily as a result of reductions in or suspension of operations for many businesses and facilities in our operating footprint due to COVID-19. Further, while monthly network peak loads at our MISO Regulated Operating Subsidiaries have returned to more normalized levels in recent months, we are unable to predict the amount and duration of possible future impacts of COVID-19, weather and other factors on load levels.