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Stock Plans (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
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 $ 28 $ 39 $ 49
Deferred tax benefit 7 9 18
Unamortized compensation expense $ 50    
Weighted-average period of recognition, in years 2 years    
Weighted-average grant date fair value $ 37 $ 60 $ 46
Weighted-average grant date fair value, per share (in USD per share) $ 52.03 $ 67.17 $ 71.05
Total fair value vested $ 30 $ 65 $ 95
Granted, number of shares (in shares) 719,677    
Number of shares remaining (in shares) 1,909,642 2,129,626  
Grant date fair value (in USD per share) $ 61.46 $ 64.94  
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 $ 4 $ 7 $ 6
Unamortized compensation expense $ 10 $ 10  
Granted, number of shares (in shares) 181,409 177,338 187,886
Number of shares remaining (in shares) 360,685    
Grant date fair value (in USD per share) $ 58.41    
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) 36,078,232    
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) 1,000,000,000,000    
Shares available to be granted (in shares) 831,560