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Stock Compensation (Narrative) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares available for future grants (in shares) 7,900    
Total compensation expense for option grants, Restricted Stock Awards and PSU's $ 66 $ 72 $ 70
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) $ 82    
The aggregate intrinsic value of options exercisable (in dollars) $ 73    
The weighted-average grant-date fair values of options granted (in dollars per share) $ 7.90 $ 5.67 $ 10.29
The total intrinsic values of options exercised (in dollars) $ 11 $ 28 $ 20
Cash proceeds received from options exercised (in dollars) 27 $ 62 $ 28
Total unrecognized compensation expense $ 13    
Period during which unrecognized compensation expense is expected to be recognized 3 years    
Amount to be recognized as compensation expense year 1 $ 6    
Amount to be recognized as compensation expense year 2 4    
Amount to be recognized as compensation expense year 3 $ 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) 2,176 1,800 1,800
Total unrecognized compensation expense $ 82    
Period during which unrecognized compensation expense is expected to be recognized 3 years    
Amount to be recognized as compensation expense year 1 $ 35    
Amount to be recognized as compensation expense year 2 19    
Amount to be recognized as compensation expense year 3 $ 2    
Weighted average grant-date fair value of Restricted Stock Awards and PSU's, Granted (in dollars per share) $ 44.38 $ 33.31 $ 46.73
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 $ 51    
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