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Stock Compensation (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares available for future grants (in shares) 6,300,000    
Total compensation expense for option grants, Restricted Stock Awards and PSU's $ 109 $ 66 $ 72
Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
The weighted-average remaining contractual term of options outstanding 5 years    
The weighted-average remaining contractual term of options exercisable 4 years    
The aggregate intrinsic value of options outstanding (in dollars) $ 81    
The aggregate intrinsic value of options exercisable (in dollars) $ 69    
The weighted-average grant-date fair values of options granted (in dollars per share) $ 6.95 $ 7.90 $ 5.67
The total intrinsic values of options exercised (in dollars) $ 36 $ 11 $ 28
Cash proceeds received from options exercised (in dollars) 55 $ 27 $ 62
Total unrecognized compensation expense $ 7    
Period during which unrecognized compensation expense is expected to be recognized 2 years    
Amount to be recognized as compensation expense year 1 $ 4    
Amount to be recognized as compensation expense year 2 $ 3    
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) 2,518,000 2,200,000 1,800,000
Total unrecognized compensation expense $ 99    
Period during which unrecognized compensation expense is expected to be recognized 3 years    
Amount to be recognized as compensation expense year 1 $ 60    
Amount to be recognized as compensation expense year 2 36    
Amount to be recognized as compensation expense year 3 $ 3    
Weighted average grant-date fair value of Restricted Stock Awards and PSU's, Granted (in dollars per share) $ 42.72 $ 44.38 $ 33.31
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 $ 74    
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