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Other (Expense) Income Net Other (Expense) Income Net (Tables)
 12 Months Ended
Dec. 31, 2014
Other Income and Expenses [Abstract]  
Other Income Expense Net [Table Text Block]
 
Years ended December 31,
 
2014
 
2013
 
2012
 
(millions)
Gain (loss) on disposal of operations
$
12

 
$
2

 
$
(3
)
Impact of Venezuelan currency devaluation
(14
)
 
—

 
—

Foreign exchange gain
8

 
20

 
19

Other income (expense), net
$
6

 
$
22

 
$
16