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PROPERTY, PLANT AND EQUIPMENT (Notes)
 12 Months Ended
Dec. 31, 2022
Property, Plant and Equipment [Abstract]  
PROPERTY, PLANT AND EQUIPMENT PROPERTY, PLANT AND EQUIPMENT
The following table sets forth our property, plant and equipment by property type, as of the dates indicated:
Estimated Useful
Lives (Years)		December 31,
2022		December 31,
2021
  
(Thousands of dollars)
Nonregulated   
Gathering pipelines and related equipment
5 to 40
$4,671,063 $4,371,936 
Processing and fractionation and related equipment
3 to 40
5,396,165 5,356,508 
Storage and related equipment
3 to 54
926,300 874,522 
Transmission pipelines and related equipment
5 to 87
756,805 726,191 
General plant and other
2 to 60
716,310 678,410 
Construction work in process—1,618,561 1,122,615 
Regulated
Storage and related equipment
5 to 25
9,659 9,197 
Natural gas transmission pipelines and related equipment
5 to 77
2,028,995 1,970,631 
NGL transmission pipelines and related equipment
5 to 87
8,575,980 8,445,523 
General plant and other
2 to 50
94,641 90,157 
Construction work in process—220,656 174,849 
Property, plant and equipment 25,015,135 23,820,539 
Accumulated depreciation and amortization - nonregulated (3,151,214)(2,814,045)
Accumulated depreciation and amortization - regulated (1,911,395)(1,686,620)
Net property, plant and equipment $19,952,526 $19,319,874 

The average depreciation rates for our regulated property are set forth, by segment, in the following table for the periods indicated:
 Years Ended December 31,
 202220212020
Natural Gas Liquids2.2%2.2%2.2%
Natural Gas Pipelines2.3%2.2%2.2%

We incurred costs for construction work in process that had not been paid at December 31, 2022, 2021 and 2020, of $171.1 million, $130.5 million and $151.7 million, respectively. Such amounts are not included in capital expenditures (less AFUDC) on the Consolidated Statements of Cash Flows.

Medford Assets - In connection with the Medford incident, we assessed the property damage to our facility and wrote off assets totaling $45.6 million, which represents the carrying value associated with certain damaged Medford facility property. These noncash property losses are fully offset by insurance recoveries.
Impairment Charges - In 2020, we evaluated our Natural Gas Gathering and Processing segment asset groups and determined that the carrying value of certain long-lived asset groups in the Powder River Basin, western Oklahoma and Kansas were not recoverable and exceeded their estimated fair value. As a result, we recorded noncash impairment charges of $362.3 million, which includes a natural gas processing plant and infrastructure in the Powder River Basin and its related supply contracts and natural gas processing plants and infrastructure in western Oklahoma and Kansas. In our Natural Gas Liquids segment, we recorded noncash impairment charges of $71.6 million related primarily to certain inactive assets, as our expectation for future use of the assets changed. These charges are included within impairment charges in our Consolidated Statement of Income for the year ended December 31, 2020.