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Inventories (Tables)
9 Months Ended
Sep. 30, 2015
Energy Related Inventory [Abstract]  
Inventory Disclosure Table
The following summarizes the major classes of inventories included in other current assets:
millions
September 30,
2015
 
December 31,
2014
Oil
$
108

 
$
133

Natural gas
37

 
27

NGLs
57

 
83

Total inventories
$
202

 
$
243