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Inventories (Tables)
3 Months Ended
Mar. 31, 2015
Inventory, Net [Abstract]  
Inventories
 
March 31,
2015
 
December 31,
2014
 
(Millions)
Natural gas liquids, olefins, and natural gas in underground storage
$
122

 
$
150

Materials, supplies, and other
78

 
81

 
$
200

 
$
231