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Capital Structure - Changes in Common Shares issued and Outstanding (Details) - shares
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
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) 420,288,886      
Beginning balance, treasury shares(in shares) (136,638,847)      
Beginning balance, common shares outstanding (in shares) 283,650,039      
Share repurchases (in shares) (36,301,882) (35,234,664)    
Ending balance, common shares issued (in shares) 421,890,790 420,288,886    
Ending balance, treasury shares (in shares) (172,894,601) (136,638,847)    
Ending balance, common shares outstanding (in shares) 248,996,189 283,650,039    
Common Stock        
Increase (Decrease) in Stockholders' Equity (in shares)        
Beginning balance, common shares issued (in shares) 420,288,886 418,323,134 417,583,825  
Beginning balance, common shares outstanding (in shares) 283,650,039 316,743,089 315,443,011  
Shares issued under ESPP (in shares) 46,128 175,862 560,769  
Shares issued from LTIP (in shares) 1,601,904 1,965,752 739,309  
Ending balance, common shares issued (in shares) 421,890,790 420,288,886 418,323,134  
Ending balance, common shares outstanding (in shares) 248,996,189 283,650,039 316,743,089  
Treasury Stock        
Increase (Decrease) in Stockholders' Equity (in shares)        
Beginning balance, treasury shares(in shares) (136,638,847) (101,580,045) (102,140,814)  
Shares issued under ESPP (in shares) 46,128 175,862 560,769  
Shares issued from LTIP (in shares) 0 0 0  
Share repurchases (in shares) (36,301,882) (35,234,664)    
Ending balance, treasury shares (in shares) (172,894,601) (136,638,847) (101,580,045)