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REVENUES (Notes)
 12 Months Ended
Dec. 31, 2020
Revenue from Contract with Customer [Abstract]  
Revenue from Contract with Customer [Text Block] REVENUES
Accounting Policies - See Note A for revenue recognition accounting policies.

Contract Assets and Contract Liabilities - Our contract asset balances at the beginning and end of the years ended December 31, 2020 and 2019, are not material. The following table sets forth the changes in our contract liability balances for the periods indicated:
Contract Liabilities
(Millions of dollars)
Balance at January 1, 2019$31.7 
Revenue recognized included in beginning balance(15.6)
Net additions41.0 
Balance at December 31, 2019 (a)57.1 
Revenue recognized included in beginning balance (c)(36.1)
Net additions20.4 
Balance at December 31, 2020 (b)$41.4 
(a) - Contract liabilities of $22.2 million and $34.9 million are included in other current liabilities and other deferred credits, respectively, in our Consolidated Balance Sheet.
(b) - Contract liabilities of $23.7 million and $17.7 million are included in other current liabilities and other deferred credits, respectively, in our Consolidated Balance Sheet.
(c) - Includes a contract settlement of revenue previously deferred.

Receivables from Customers and Revenue Disaggregation - Substantially all of the balances in accounts receivable on our Consolidated Balance Sheets at December 31, 2020 and 2019, relate to customer receivables. Revenues sources are disaggregated in Note Q.

Practical Expedients - We do not disclose the value of unsatisfied performance obligations for (i) contracts with an original expected length of one year or less and (ii) variable consideration on contracts for which we recognize revenue at the amount to which we have the right to invoice for services performed.

Transaction Price Allocated to Unsatisfied Performance Obligations - The following table presents aggregate value allocated to unsatisfied performance obligations as of December 31, 2020, and the amounts we expect to recognize in revenue in future periods, related primarily to firm transportation and storage contracts with remaining contract terms ranging from one month to 23 years:
Expected Period of Recognition in Revenue
(Millions of dollars)
2021$328.2 
2022263.0 
2023235.4 
2024197.9 
2025 and beyond762.0 
Total estimated transaction price allocated to unsatisfied performance obligations$1,786.5 

The table above excludes variable consideration allocated entirely to wholly unsatisfied performance obligations, wholly unsatisfied promises to transfer distinct goods or services that are part of a single performance obligation and consideration we determine to be fully constrained. Information on the nature of the variable consideration excluded and the nature of the performance obligations to which the variable consideration relates can be found in the description of the major contract types discussed in Note A. The amounts we determined to be fully constrained relate to future sales obligations under long-term sales contracts where the transaction price is not known and minimum volume agreements, which we consider to be fully constrained until invoiced.