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Inventories
9 Months Ended
Sep. 30, 2014
Energy Related Inventory [Abstract]  
Inventories
3. Inventories

The following summarizes the major classes of inventories included in other current assets:
millions
September 30,
2014
 
December 31,
2013
Crude oil
$
187

 
$
88

Natural gas
23

 
43

NGLs
122

 
79

Total inventories
$
332

 
$
210