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Stock Compensation Maximum Future Value of Performance Shares (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Feb. 28, 2018
Mar. 31, 2018
Dec. 30, 2017
Dec. 29, 2018
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
2015 Performance share award settlement in terms of original target 75.00%        
2015 Performance share award settlement in dollars $ 8        
2018 Award          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Maximum future value       $ 19  
2017 Award          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Maximum future value       11  
2016 Award          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Maximum future value       $ 15  
2018 Performance share award          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Performance Shares Issued On Vesting Date Minimum   0.00%      
Performance Shares Issued On Vesting Date Maximum   200.00%      
Share Based Compensation Arrangement By Share Based Payment Award Performance Target Time Period   3 years      
Performance Award Condition Time Period   3 years      
Non-vested, beginning of year - weighted-average grant date fair value       $ 72  
Performance Share Target Grant       166,000  
2017 Performance share award          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Performance Shares Issued On Vesting Date Minimum     0.00%    
Performance Shares Issued On Vesting Date Maximum     200.00%    
Share Based Compensation Arrangement By Share Based Payment Award Performance Target Time Period     3 years    
Performance Award Condition Time Period     3 years    
Non-vested, beginning of year - weighted-average grant date fair value     $ 67    
Performance Share Target Grant     100,000    
2016 Performance share award          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Performance Shares Issued On Vesting Date Minimum     0.00%    
Performance Shares Issued On Vesting Date Maximum     200.00%    
Share Based Compensation Arrangement By Share Based Payment Award Performance Target Time Period     3 years    
Performance Award Condition Time Period     3 years    
Non-vested, beginning of year - weighted-average grant date fair value         $ 80
Performance Share Target Grant     129,000