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Inventory, Linefill and Base Gas and Long-term Inventory
6 Months Ended
Jun. 30, 2017
Inventory, Linefill and Base Gas and Long-term Inventory  
Inventory, Linefill and Base Gas and Long-term Inventory
Inventory, Linefill and Base Gas and Long-term Inventory
 
Inventory, linefill and base gas and long-term inventory consisted of the following (barrels and natural gas volumes in thousands and carrying value in millions):
 
June 30, 2017
 
 
December 31, 2016
 
Volumes
 
Unit of
Measure
 
Carrying
Value
 
Price/
Unit 
(1)
 
 
Volumes
 
Unit of
Measure
 
Carrying
Value
 
Price/
Unit 
(1)
Inventory
 

 
 
 
 

 
 

 
 
 

 
 
 
 

 
 

Crude oil
14,854

 
barrels
 
$
675

 
$
45.44

 
 
23,589

 
barrels
 
$
1,049

 
$
44.47

NGL
11,507

 
barrels
 
245

 
$
21.29

 
 
13,497

 
barrels
 
242

 
$
17.93

Natural gas
316

 
Mcf
 
1

 
$
3.16

 
 
14,540

 
Mcf
 
32

 
$
2.20

Other
N/A

 
 
 
15

 
N/A

 
 
N/A

 
 
 
20

 
N/A

Inventory subtotal
 

 
 
 
936

 
 

 
 
 

 
 
 
1,343

 
 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Linefill and base gas
 

 
 
 
 

 
 

 
 
 

 
 
 
 

 
 

Crude oil
12,834

 
barrels
 
741

 
$
57.74

 
 
12,273

 
barrels
 
710

 
$
57.85

NGL
1,625

 
barrels
 
45

 
$
27.69

 
 
1,660

 
barrels
 
45

 
$
27.11

Natural gas
24,976

 
Mcf
 
108

 
$
4.32

 
 
30,812

 
Mcf
 
141

 
$
4.58

Linefill and base gas subtotal
 

 
 
 
894

 
 

 
 
 

 
 
 
896

 
 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Long-term inventory
 

 
 
 
 

 
 

 
 
 

 
 
 
 

 
 

Crude oil
1,922

 
barrels
 
77

 
$
40.06

 
 
3,279

 
barrels
 
163

 
$
49.71

NGL
1,863

 
barrels
 
40

 
$
21.47

 
 
1,418

 
barrels
 
30

 
$
21.16

Long-term inventory subtotal
 

 
 
 
117

 
 

 
 
 

 
 
 
193

 
 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Total
 

 
 
 
$
1,947

 
 

 
 
 

 
 
 
$
2,432

 
 

 
(1) 
Price per unit of measure is comprised of a weighted average associated with various grades, qualities and locations. Accordingly, these prices may not coincide with any published benchmarks for such products.

At the end of each reporting period, we assess the carrying value of our inventory and make any adjustments necessary to reduce the carrying value to the applicable net realizable value. Any resulting adjustments are a component of “Purchases and related costs” on our accompanying Condensed Consolidated Statements of Operations. We recorded a charge of $35 million during the three and six months ended June 30, 2017 primarily related to the writedown of our crude oil inventory due to a decline in prices. Substantially all of this inventory valuation adjustment was offset by the recognition of gains on derivative instruments being utilized to hedge future sales of our crude oil inventory. Such gains were recorded to “Supply and Logistics segment revenues” in our accompanying Condensed Consolidated Statements of Operations. See Note 10 for discussion of our derivative and risk management activities. We recorded an inventory valuation adjustment of $3 million during the six months ended June 30, 2016.