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Fair Value Measurements (Notes)
12 Months Ended
Dec. 31, 2021
Fair Value Disclosures [Abstract]  
Fair Value Measurements Fair Value Measurements
The following table presents, by level within the fair value hierarchy, certain of our significant financial assets and liabilities. The carrying values of short-term financial assets that have variable interest rates (advances to affiliate), accounts receivable and accounts payable approximate fair value because of the short-term nature of these instruments. Therefore, these assets and liabilities are not presented in the following table.
 
Fair Value Measurements Using
Carrying
Amount
Fair
Value
Quoted
Prices In
Active
Markets for
Identical
Assets
(Level 1)
Significant
Other
Observable
Inputs
(Level 2)
Significant
Unobservable
Inputs
(Level 3)
(Millions)
Assets (liabilities) at December 31, 2021:
Measured on a recurring basis:
ARO Trust investments$260.5 $260.5 $260.5 $— $— 
Additional disclosures:
Long-term debt, including current portion(5,294.6)(6,849.8)— (6,849.8)— 
Assets (liabilities) at December 31, 2020:
Measured on a recurring basis:
ARO Trust investments$235.5 $235.5 $235.5 $— $— 
Additional disclosures:
Long-term debt, including current portion(5,239.8)(6,949.0)— (6,949.0)— 
Fair Value Methods
The following methods and assumptions were used to estimate the fair value of each class of financial instruments for which it is practicable to estimate that value:
Assets and liabilities measured at fair value on a recurring basis
ARO Trust investments: We deposit a portion of our collected rates, pursuant to the terms of the Docket No. RP18-1126 rate case settlement, into the ARO Trust which is specifically designated to fund future AROs. The ARO Trust invests in a portfolio of actively traded mutual funds that are measured at fair value on a recurring basis based on quoted prices in an active market and are reported in Other Assets-Other on the accompanying Consolidated Balance Sheet. However, both realized and unrealized gains and losses are ultimately recorded as regulatory assets or liabilities. See Note 6 – ARO Trust for more information.
Long-term debt, including current portion: The disclosed fair value of our long-term debt is determined primarily by a market approach using broker quoted indicative period-end bond prices. The quoted prices are based on observable transactions in less active markets for our debt or similar instruments. The fair values of the financing obligations associated with our Dalton, Atlantic Sunrise and Leidy South projects, which are included within long-term debt, were determined using an income approach (see Note 5 – Debt and Financing Arrangements).
Nonrecurring fair value measurementsApprovals required for the Northeast Supply Enhancement project from the New York State Department of Environmental Conservation and the New Jersey Department of Environmental Protection have been denied and we have not refiled at this time. Beginning in May 2020, we discontinued capitalization of costs related to this project. Considering that the customer precedent agreements and FERC certificate for the project remain in effect, we had previously concluded that the probability of completing the project was sufficient to not require impairment. However, developments in the political and regulatory environments caused us to slightly lower that assessed probability such that the capitalized project costs required impairment in 2020. As of December 31, 2020, the estimated fair value of the materials within the capitalized project costs were determined to be $41.5 million and considered other internal uses and salvage values for the Property, plant, and equipment, net, a Level 3 measurement. The remaining capitalized costs were determined to have no fair value. As a result we recognized an impairment charge of $170.1 million during the fourth quarter of 2020.