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Stock Compensation - Performance Shares (Details) - USD ($)
$ / shares in Units, $ in Millions
6 Months Ended
Jul. 01, 2017
Feb. 28, 2017
Feb. 28, 2015
2014 Award      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance share award settlement as a percentage of target   35.00%  
Performance share award settlement     $ 5
2015 Award      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Maximum fair value of performance shares $ 22    
2016 Award      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Maximum fair value of performance shares $ 24    
2017 Award      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of performance shares that may be earned upon performance, minimum 0.00%    
Percentage of performance shares that may be earned upon performance, maximum 200.00%    
Performance shares target vesting period 3 years    
Performance shares target grant distribution (in shares) 186,000    
Grant-date fair value of shares that correspond with target grants $ 67    
Maximum fair value of performance shares $ 26