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Inventories (Tables)
 12 Months Ended
Dec. 31, 2015
Inventory Disclosure [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