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Supplemental Cash Flow Information
6 Months Ended
Jun. 29, 2018
Supplemental Cash Flow Elements [Abstract]  
Supplemental Cash Flow Information
. Supplemental Cash Flow Information
 
First Half Ended
 
June 29,
2018
 
June 30,
2017
 
(in millions)
Interest paid
$
97

 
$
83

Income tax payments
$
54

 
$
96

Income tax refunds
$
3

 
$
7