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Inventories
3 Months Ended
Mar. 31, 2014
Disclosure Text Block [Abstract]  
Inventories
3. Inventories

The following summarizes the major classes of inventories included in other current assets:
 
March 31,
 
December 31,
millions
2014
 
2013
Crude oil
$
119

 
$
88

Natural gas
2

 
43

NGLs
96

 
79

Total
$
217

 
$
210