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Property and Equipment (Tables)
 12 Months Ended
Dec. 31, 2017
Property, Plant and Equipment [Abstract]  
Components of property and equipment, net
Property and equipment, net is stated at cost and consisted of the following (in millions):
 
Estimated Useful
Lives (Years)
 
December 31,
 
 
2017
 
2016
Pipelines and related facilities (1)
10 - 70
 
$
9,585

 
$
9,025

Storage, terminal and rail facilities
30 - 70
 
5,558

 
5,305

Trucking equipment and other
3 - 15
 
414

 
408

Construction in progress
—
 
610

 
826

Office property and equipment
2 - 50
 
255

 
222

Land and other
N/A
 
440

 
434

Property and equipment, gross
 
 
16,862

 
16,220

Accumulated depreciation
 
 
(2,773
)
 
(2,348
)
Property and equipment, net
 
 
$
14,089

 
$
13,872


 
(1) 
We include rights-of-way, which are intangible assets, in our pipeline and related facilities amounts within property and equipment.