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Revenue Recognition (Notes)
 12 Months Ended
Dec. 31, 2020
Revenue Recognition [Abstract]  
Revenue from Contract with Customer [Text Block]
2. REVENUE RECOGNITION
Revenue by Category
Our revenue disaggregation by major service line includes Natural gas sales, Natural gas transportation, Natural gas storage, and Other, which are separately presented on the Condensed Consolidated Statement of Comprehensive Income.


Contract Liabilities
The following table presents a reconciliation of our contract liabilities:
December 31, 2020December 31, 2019
(Thousands)
Balance at beginning of period$226,164 $236,730 
Recognized in revenue
(10,568)(10,566)
Balance at end of period$215,596 $226,164 
Remaining Performance Obligations
Our remaining performance obligations primarily include reservation charges on contracted capacity on our firm transportation and storage contracts with customers. Amounts from certain contracts included in the table below, which are subject to the periodic review and approval by the FERC, reflect the rates for such services in our current FERC tariffs, net of estimated reserve for refund, for the life of the related contracts; however, these rates may change based on future tariffs approved by the FERC and the amount and timing of these changes is not currently known. This table excludes the variable consideration component for commodity charges. Certain of our contracts contain evergreen provisions for periods beyond the initial term of the contract. The remaining performance obligation as of December 31, 2020, do not consider potential future performance obligations for which the renewal has not been exercised. The table below also does not include contracts with customers for which the underlying facilities have not received FERC authorization to be placed into service.
The following table presents the amount of the contract liabilities balance expected to be recognized as revenue when performance obligations are satisfied and the transaction price allocated to the remaining performance obligations under certain contracts as of December 31, 2020.
Contract LiabilitiesRemaining Performance Obligations
(Thousands)
2021$10,566 $2,349,047 
202210,566 2,196,621 
202310,566 2,040,685 
202410,568 1,487,964 
202510,566 1,453,924 
Thereafter162,764 12,231,530 
Total$215,596 $21,759,771 
Accounts Receivable Receivables from contracts with customers are included within Receivables - Trade and Receivables - Affiliates and receivables that are not related to contracts with customers are included within the balance of Receivables - Advances to affiliate and Receivables - Other in our Consolidated Balance Sheet.