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REVENUES
6 Months Ended
Jun. 30, 2024
Revenue from Contract with Customer [Abstract]  
REVENUES REVENUES
Contract Assets and Contract Liabilities - Our contract asset balances at the beginning and the end of the period primarily relate to our firm service transportation contracts with tiered rates, which are not material. Our contract liabilities at the beginning and end of the period relate primarily to deferred revenue on Refined Products and crude transportation contracts, NGL storage contracts and contributions in aid of construction received from customers. The following table sets forth the balances in contract liabilities for the periods indicated:

Contract Liabilities
(Millions of dollars)
Balance at December 31, 2023 (a)$150 
Revenue recognized included in beginning balance(114)
Net additions123 
Balance at June 30, 2024 (b)$159 
(a) - Contract liabilities of $104 million and $46 million are included in other current liabilities and other deferred credits, respectively, in our Consolidated Balance Sheet.
(b) - Contract liabilities of $119 million and $40 million are included in the other current liabilities and other deferred credits, respectively in our Consolidated Balance Sheet.

Receivables from Customers and Revenue Disaggregation - Substantially all of the balances in accounts receivable on our Consolidated Balance Sheets at June 30, 2024, relate to customer receivables. Excluding the insurance receivable related to the legal proceeding described in Note O of the Notes to Consolidated Financial Statements in our Annual Report, substantially all of the balances in accounts receivable on our Consolidated Balance Sheets at December 31, 2023, related to customer receivables. Revenue sources are disaggregated in Note L.

Unsatisfied Performance Obligations - 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.

The following table presents aggregate value allocated to unsatisfied performance obligations as of June 30, 2024, 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 30 years:
Expected Period of Recognition in Revenue
(Millions of dollars)
Remainder of 2024$650 
20251,120 
2026940 
2027835 
2028 and beyond2,462 
Total $6,007 

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. The amounts we determined to be fully constrained relate to future sales obligations under long-term sales contracts where the value is not known and minimum volume agreements, which we consider to be fully constrained until invoiced.