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Stock Compensation - Performance Shares (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended
Feb. 28, 2019
Mar. 30, 2019
Jun. 29, 2019
2019 Award      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period   3 years  
Performance shares target grant distribution (in shares)     239,000
Grant-date fair value of shares that correspond with target grants     $ 59
2016 Award      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of performance shares that may be earned upon performance 85.00%    
Performance share award settlement $ 6    
Minimum [Member] | 2019 Award      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of performance shares that may be earned upon performance   0.00%  
Maximum [Member] | 2019 Award      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of performance shares that may be earned upon performance   200.00%