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Capital Structure - Changes in Common Shares issued and Outstanding (Details) - shares
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Capital Structure        
Preferred stock, shares authorized (in shares) 10,000,000 10,000,000 10,000,000 10,000,000
Common stock, shares authorized (in shares) 500,000,000 500,000,000 500,000,000 500,000,000
Increase (Decrease) in Stockholders' Equity (in shares)        
Beginning balance, common shares issued (in shares) 418,323,134      
Beginning balance, treasury shares(in shares) (101,580,045)      
Beginning balance, common shares outstanding (in shares) 316,743,089      
Share repurchases (in shares) (35,234,664)      
Ending balance, common shares issued (in shares) 420,288,886 418,323,134    
Ending balance, treasury shares (in shares) (136,638,847) (101,580,045)    
Ending balance, common shares outstanding (in shares) 283,650,039 316,743,089    
Common Stock        
Increase (Decrease) in Stockholders' Equity (in shares)        
Beginning balance, common shares issued (in shares) 418,323,134 417,583,825 416,939,950  
Beginning balance, common shares outstanding (in shares) 316,743,089 315,443,011 314,190,042  
Shares issued under ESPP (in shares) 175,862 560,769 609,094  
Shares issued from LTIP (in shares) 1,965,752 739,309 643,875  
Ending balance, common shares issued (in shares) 420,288,886 418,323,134 417,583,825  
Ending balance, common shares outstanding (in shares) 283,650,039 316,743,089 315,443,011  
Treasury Stock        
Increase (Decrease) in Stockholders' Equity (in shares)        
Beginning balance, treasury shares(in shares) (101,580,045) (102,140,814) (102,749,908)  
Shares issued under ESPP (in shares) 175,862 560,769 609,094  
Shares issued from LTIP (in shares) 0 0 0  
Share repurchases (in shares) (35,234,664)      
Ending balance, treasury shares (in shares) (136,638,847) (101,580,045) (102,140,814)