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Supplemental Cash Flow Information (Tables)
 12 Months Ended
Dec. 31, 2016
Supplemental Cash Flow Information [Abstract]  
Supplemental Cash Flow Information
Year Ended December 31,
2016
2015
2014
(in millions)
Interest paid on outstanding debt
$
162
 
$
182
 
$
176
 
Income tax payments
$
120
 
$
132
 
$
129
 
Income tax refunds
$
8
 
$
8
 
$
9