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Stock Plans (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period, in years 3 years    
Pre-tax compensation expense $ 31 $ 28 $ 39
Deferred tax benefit 8 7 9
Unamortized compensation expense $ 54    
Weighted-average period of recognition, in years 2 years    
Weighted-average grant date fair value $ 49 $ 37 $ 60
Weighted-average grant date fair value, per share (in USD per share) $ 42.59 $ 52.03 $ 67.17
Granted, number of shares (in shares) 1,162,118    
Number of shares remaining (in shares) 2,239,379 1,909,642  
Grant date fair value (in USD per share) $ 51.76 $ 61.46  
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 $ 4 $ 7
Unamortized compensation expense $ 9    
Granted, number of shares (in shares) 275,288 181,409 177,338
Number of shares remaining (in shares) 409,392    
Grant date fair value (in USD per share) $ 49.63    
Restricted Stock and Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total fair value vested $ 25 $ 30 $ 65
Common Stock [Member] | 2020 Performance Incentive 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) 25,000,000    
Shares available to be granted (in shares) 24,827,160    
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) 759,234