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Income Per Common Share - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Sep. 17, 2019
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)             16,500,000    
Stock repurchased and retired during period   $ 0 $ 602,000,000 $ 151,000,000 $ 167,000,000 $ 122,000,000 $ 602,000,000    
Remaining authorized repurchase amount $ 900,000,000           $ 900,000,000    
Dividends                  
Cash dividends per common share paid (in dollars per share) $ 0.135     $ 0.120     $ 0.405 $ 0.360  
Cash dividends per common share declared (in dollars per share) $ 0.140     $ 0.135     $ 0.410 $ 0.375  
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) 106,000     855,000     685,000 1,200,000  
Performance Restricted Stock Units                  
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  
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 (in shares)             400,000    
Common Stock                  
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                  
Stock repurchased during period, additional shares (in shares) 1,200,000