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PROPERTY, PLANT AND EQUIPMENT (Tables)
 12 Months Ended
Dec. 31, 2019
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment by Property Type

The following table sets forth our property, plant and equipment by property type, for the periods indicated:
 
 
Estimated Useful
Lives (Years)
 
December 31,
2019
 
December 31,
2018
 
 
 
 
(Thousands of dollars)
Nonregulated
 
 
 
 
 
 
Gathering pipelines and related equipment
 
5 to 40
 
$
4,316,936

 
$
3,851,043

Processing and fractionation and related equipment
 
3 to 40
 
4,439,332

 
4,171,072

Storage and related equipment
 
3 to 54
 
684,635

 
656,455

Transmission pipelines and related equipment
 
5 to 54
 
797,678

 
782,258

General plant and other
 
2 to 60
 
610,013

 
547,424

Construction work in process
 
—
 
1,645,663

 
797,182

Regulated
 
 
 


 
 
Storage and related equipment
 
5 to 25
 
9,180

 
8,987

Natural gas transmission pipelines and related equipment
 
5 to 77
 
1,552,546

 
1,475,789

NGL transmission pipelines and related equipment
 
5 to 88
 
6,126,056

 
4,677,599

General plant and other
 
2 to 50
 
66,507

 
61,136

Construction work in process
 
—
 
1,802,946

 
1,002,018

Property, plant and equipment
 
 
 
22,051,492

 
18,030,963

Accumulated depreciation and amortization - nonregulated
 
 
 
(2,471,649
)
 
(2,168,855
)
Accumulated depreciation and amortization - regulated
 
 
 
(1,231,158
)
 
(1,095,457
)
Net property, plant and equipment
 
 
 
$
18,348,685

 
$
14,766,651
Average Depreciation Rates for Regulated Property
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,
 
 
2019
 
2018
 
2017
Natural Gas Liquids
 
2.0%
 
1.9%
 
1.9%
Natural Gas Pipelines
 
2.1%
 
2.1%
 
2.1%