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Earnings Per Common Share - Narrative (Details) - USD ($)
 1 Months Ended 3 Months Ended
Mar. 31, 2018
Feb. 28, 2018
Mar. 31, 2018
Mar. 31, 2017
Feb. 16, 2018
May 31, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]            
Amount authorized for repurchase         $ 150,000,000 $ 1,500,000,000
Stock repurchased during period (in shares) 900,000 2,800,000        
Stock repurchased and retired during period (in shares)     3,700,000      
Remaining amount authorized to be repurchased $ 1,100,000,000   $ 1,100,000,000      
Dividends            
Cash dividends per common share paid (in dollars per share)     $ 0.105 $ 0.1    
Cash dividends per common share declared (in dollars per share)     $ 0.105 $ 0.100    
Stock options            
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]            
Antidilutive effect on computation of diluted earnings per common share (in shares)     431,000 221,000    
Long-term stock awards            
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]            
Stock repurchased And retired during period to offset dilutive impact of awards granted shares (in shares)     600,000