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Income Per Common Share - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 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)     15,200,000    
Payments for repurchase of common stock     $ 878 $ 602  
Remaining authorized repurchase amount $ 1,300   $ 1,300    
Dividends          
Cash dividends per common share paid (in dollars per share) $ 0.235 $ 0.135 $ 0.610 $ 0.405  
Cash dividends per common share declared (in dollars per share) $ 0.235 $ 0.140 $ 0.470 $ 0.410  
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) 70,000 106,000 285,000 685,000  
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)     700,000