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Stock Compensation (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total compensation expense for option grants, Restricted Stock Awards and PSU's $ 72 $ 70 $ 55
Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
The weighted-average remaining contractual term of options outstanding 6 years    
The weighted-average remaining contractual term of options exercisable 4 years    
The aggregate intrinsic value of options outstanding (in dollars) $ 149    
The aggregate intrinsic value of options exercisable (in dollars) $ 106    
The weighted-average grant-date fair values of options granted (in dollars per share) $ 5.67 $ 10.29 $ 12.80
The total intrinsic values of options exercised (in dollars) $ 28 $ 20 $ 66
Cash proceeds received from options exercised (in dollars) 62 $ 28 $ 93
Total unrecognized compensation expense $ 19    
Period during which unrecognized compensation expense is expected to be recognized 4 years    
Amounts to be recognized as compensation expense during the next fiscal year $ 7    
Amounts to be recognized as compensation expense during the year following the next fiscal year 6    
Amounts to be recognized as compensation expense during the second year following the next fiscal year 4    
Amounts to be recognized as compensation expense during the third year following the next fiscal year $ 2    
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) 1,818,000 1,800,000 1,400,000
Total unrecognized compensation expense $ 53    
Period during which unrecognized compensation expense is expected to be recognized 3 years    
Amounts to be recognized as compensation expense during the next fiscal year $ 33    
Amounts to be recognized as compensation expense during the year following the next fiscal year 18    
Amounts to be recognized as compensation expense during the second year following the next fiscal year $ 2    
Weighted average grant-date fair value of Restricted Stock Awards and PSU's, Granted (in dollars per share) $ 33.31 $ 46.73 $ 40.78
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 $ 32    
Performance Stock Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years    
2009 Incentive Compensation Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares available for future grants (in shares) 9,900,000    
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