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Income Per Common Share - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
May 31, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                  
Amount authorized for repurchase                 $ 2,000,000,000.0
Stock repurchased during period (in shares)             11,500,000    
Stock repurchased and retired during period $ 151,000,000 $ 167,000,000 $ 122,000,000 $ 89,000,000 $ 115,000,000 $ 150,000,000 $ 440,000,000    
Remaining authorized repurchase amount $ 1,960,000,000           $ 1,960,000,000    
Dividends                  
Cash dividends per common share paid (in dollars per share) $ 0.120     $ 0.105     $ 0.360 $ 0.315  
Cash dividends per common share declared (in dollars per share) $ 0.135     $ 0.120     $ 0.375 $ 0.330  
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) 855,000     668,000     1,200,000 627,000  
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           20,000    
Stock repurchased and retired during period to offset dilutive impact of awards granted (in shares)             600,000