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(Loss) Income Per Common Share - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Jul. 29, 2021
Jun. 30, 2021
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Feb. 10, 2021
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]              
Amount authorized for repurchase             $ 2,000
Payment for common stock shares repurchased   $ 350 $ 350   $ 350    
Stock repurchased during period (in shares)   5,100,000     12,200,000    
Payments for repurchase of common stock         $ 750 $ 602  
Remaining authorized repurchase amount   $ 1,400 $ 1,400   $ 1,400    
Dividends              
Cash dividends per common share paid (in dollars per share)     $ 0.235 $ 0.135 $ 0.375 $ 0.270  
Cash dividends per common share declared (in dollars per share)     $ 0.235 $ 0.135 $ 0.235 $ 0.270  
Subsequent Event              
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]              
Stock repurchased during period (in shares) 900,000            
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)     2,800,000 762,000 260,000 672,000  
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)     464,000   1,000    
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