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Inventories
9 Months Ended
Sep. 30, 2013
Disclosure Text Block [Abstract]  
Inventories
2. Inventories

       The following summarizes the major classes of inventories included in other current assets:
 
September 30,
 
December 31,
millions
2013
 
2012
Crude oil
$
102

 
$
91

Natural gas
41

 
48

NGLs
66

 
37

Total
$
209

 
$
176