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Inventories
6 Months Ended
Jun. 30, 2014
Energy Related Inventory [Abstract]  
Inventories
3. Inventories

The following summarizes the major classes of inventories included in other current assets:
millions
June 30,
2014
 
December 31,
2013
Crude oil
$
153

 
$
88

Natural gas
6

 
43

NGLs
127

 
79

Total
$
286

 
$
210