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UNCONSOLIDATED AFFILIATES (Notes)
3 Months Ended
Mar. 31, 2023
Equity Method Investments and Joint Ventures [Abstract]  
UNCONSOLIDATED AFFILIATES UNCONSOLIDATED AFFILIATES
Equity in Net Earnings from Investments - The following table sets forth our equity in net earnings from investments for the periods indicated:
Three Months Ended
March 31,
 20232022
 
(Millions of dollars)
Northern Border$24 $20 
Overland Pass9 
Roadrunner7 
Other 
Equity in net earnings from investments$40 $36 

We incurred expenses in transactions with unconsolidated affiliates of $28 million and $15 million for the three months ended March 31, 2023 and 2022, respectively, related primarily to Overland Pass and Northern Border. Revenue earned and accounts receivable from, and accounts payable to, our equity-method investees were not material.

We have an operating agreement with Roadrunner that provides for reimbursement or payment to us for management services and certain operating costs. Reimbursements and payments from Roadrunner included in operating income in our Consolidated Statements of Income for all periods presented were not material.