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Income Per Common Share - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Feb. 10, 2021
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Amount authorized for repurchase     $ 2,000
Stock repurchased during period (in shares) 5,500,000    
Stock repurchased and retired during period $ 303 $ 602  
Remaining authorized repurchase amount $ 1,900    
Dividends      
Cash dividends per common share paid (in dollars per share) $ 0.140 $ 0.135  
Cash dividends per common share declared (in dollars per share)   $ 0.135  
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) 188,000 582,000  
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)   7,000  
Restricted stock units      
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) 600,000