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Property, Plant and Equipment
 12 Months Ended
Dec. 31, 2018
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
Property, Plant and Equipment

Property, plant and equipment with associated accumulated depreciation is shown below:
 
 
Estimated
Useful Lives
 
December 31,
(In millions)
 
2018
 
2017
Natural gas gathering and NGL transportation pipelines and facilities
 
5 - 30 years
 
$
5,926

 
$
5,178

Processing, fractionation and storage facilities
 
10 - 40 years
 
5,336

 
3,893

Pipelines and related assets
 
15 - 51 years
 
2,560

 
2,253

Barges and towing vessels
 
20 years
 
620

 
490

Terminals and related assets
 
4 - 30 years
 
1,178

 
821

Refinery related assets
 
5 - 30 years
 
938

 
—

Land, building, office equipment and other
 
3 - 35 years
 
957

 
770

Construction-in-progress
 
 
 
801

 
1,057

Total
 
 
 
18,316

 
14,462

Less accumulated depreciation
 
 
 
3,677

 
2,275

Property, plant and equipment, net
 
 
 
$
14,639

 
$
12,187



Property, plant and equipment includes gross assets acquired under capital leases of approximately $25 million at December 31, 2018 and 2017, with related amounts in accumulated depreciation of approximately $9 million at December 31, 2018 and 2017.