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Stock Plans (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Restricted Stock And Restricted Stock Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period, in years 3 years    
Pre-tax compensation expense $ 39 $ 49 $ 44
Deferred tax benefit 9 18 17
Unamortized compensation expense $ 62    
Weighted-average period of recognition, in years 2 years    
Weighted-average grant date fair value $ 60 $ 46 $ 56
Weighted-average grant date fair value, per share (in USD per share) $ 67.17 $ 71.05 $ 59.38
Total fair value vested $ 65 $ 95 $ 78
Granted, number of shares (in shares) 896,962    
Number of shares remaining (in shares) 2,129,626 2,384,501  
Grant date fair value (in USD per share) $ 64.94 $ 60.40  
Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares, outstanding (in shares)   0  
Performance Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period, in years 3 years    
Pre-tax compensation expense $ 7 $ 6  
Unamortized compensation expense $ 10    
Granted, number of shares (in shares) 177,338 187,886 0
Number of shares remaining (in shares) 274,324    
Grant date fair value (in USD per share) $ 65.90    
Common Stock [Member] | 2015 Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Maximum number of shares issuable under the stock compensation plan (in shares) 40,000,000    
Shares available to be granted (in shares) 37,033,741    
Common Stock [Member] | 2015 Directors Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Maximum number of shares issuable under the stock compensation plan (in shares) 1,000,000    
Shares available to be granted (in shares) 880,291