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Inventories (Tables)
9 Months Ended
Sep. 30, 2014
Inventory, Net [Abstract]  
Inventories
 
September 30,
2014
 
December 31,
2013
 
(Millions)
Natural gas liquids, olefins, and natural gas in underground storage
$
202

 
$
111

Materials, supplies, and other
82

 
83

 
$
284

 
$
194