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Inventories (Tables)
 12 Months Ended
Dec. 31, 2015
Inventory, Net [Abstract]  
Inventories [Table Text Block]
 
December 31,
 
2015
 
2014
 
(Millions)
Natural gas liquids, olefins, and natural gas in underground storage
$
57

 
$
150

Materials, supplies, and other
70

 
81

 
$
127

 
$
231