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Income Per Common Share - Narrative (Details) - USD ($)
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
May 31, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Amount authorized for repurchase     $ 1,500,000,000
Stock repurchased during period (in shares) 3,500,000    
Stock Repurchased and Retired During Period, Value $ 122,000,000 $ 150,000,000  
Payments for Repurchase of Common Stock 116,000,000 $ 150,000,000  
Remaining amount authorized to be repurchased $ 513,000,000    
Dividends      
Cash dividends per common share paid (in dollars per share) $ 0.120 $ 0.105  
Cash dividends per common share declared (in dollars per share) $ 0.120 $ 0.105  
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) 1,100,000 431,000  
Long-term stock awards      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Antidilutive effect on computation of diluted earnings per common share (in shares) 20,000    
Stock repurchased and retired during period to offset dilutive impact of awards granted (in shares) 600,000