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Supplemental Cash Flow Information
 6 Months Ended
Jun. 30, 2017
Supplemental Cash Flow Information [Abstract]  
Supplemental Cash Flow Information

21.  Supplemental Cash Flow Information

First Half Ended
June 30,
2017
June 24,
2016
(in millions)
Interest paid on outstanding debt
$
83
 
$
83
 
Income tax payments
$
96
 
$
51
 
Income tax refunds
$
7
 
$
3