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Stock Compensation (Narrative) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares available for future grants (in shares) 19,400    
Total compensation expense for option grants, Restricted Stock Awards and PSU's $ 151 $ 89 $ 109
Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
The weighted-average remaining contractual term of options outstanding 4 years    
The weighted-average remaining contractual term of options exercisable 4 years    
The aggregate intrinsic value of options outstanding (in dollars) $ 77    
The aggregate intrinsic value of options exercisable (in dollars) 69    
The weighted-average grant-date fair values of options granted (in dollars per share)   $ 7.88 $ 6.95
The total intrinsic values of options exercised (in dollars) 32 $ 15 $ 36
Cash proceeds received from options exercised (in dollars) $ 49 $ 27 $ 55
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 10 years    
Restricted Stock Awards And PSUs [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common shares or units granted as Restricted Stock Awards and PSUs (in shares) 2,732 2,600 2,500
Total unrecognized compensation expense $ 107    
Period during which unrecognized compensation expense is expected to be recognized 3 years    
Amount to be recognized as compensation expense year 1 $ 67    
Amount to be recognized as compensation expense year 2 34    
Amount to be recognized as compensation expense year 3 $ 6    
Weighted average grant-date fair value of Restricted Stock Awards and PSU's, Granted (in dollars per share) $ 45.59 $ 42.11 $ 42.72
Restricted Stock Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years    
Total fair value of Restricted Stock Awards vested during the period $ 63    
Performance Stock Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years    
Minimum [Member] | Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 1 year    
Maximum [Member] | Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 5 years