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PROPERTY, PLANT AND EQUIPMENT (Notes)
 12 Months Ended
Dec. 31, 2021
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, for the periods indicated:
Estimated Useful
Lives (Years)		December 31,
2021		December 31,
2020
  
(Thousands of dollars)
Nonregulated   
Gathering pipelines and related equipment
5 to 40
$4,371,936 $4,143,752 
Processing and fractionation and related equipment
3 to 40
5,356,508 5,084,802 
Storage and related equipment
3 to 54
874,522 798,785 
Transmission pipelines and related equipment
5 to 54
886,343 810,434 
General plant and other
2 to 60
695,117 647,675 
Construction work in process—1,132,961 1,265,736 
Regulated
Storage and related equipment
5 to 25
9,197 9,180 
Natural gas transmission pipelines and related equipment
5 to 77
1,660,034 1,569,268 
NGL transmission pipelines and related equipment
5 to 88
8,595,968 8,423,544 
General plant and other
2 to 50
73,449 72,535 
Construction work in process—164,504 247,224 
Property, plant and equipment 23,820,539 23,072,935 
Accumulated depreciation and amortization - nonregulated (2,885,020)(2,514,328)
Accumulated depreciation and amortization - regulated (1,615,645)(1,403,679)
Net property, plant and equipment $19,319,874 $19,154,928 

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,
 202120202019
Natural Gas Liquids2.2%2.2%2.0%
Natural Gas Pipelines2.1%2.1%2.1%

We incurred costs for construction work in process that had not been paid at December 31, 2021, 2020 and 2019, of $130.5 million, $151.7 million and $544.8 million, respectively. Such amounts are not included in capital expenditures (less AFUDC) on the Consolidated Statements of Cash Flows.
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.