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Earnings (Loss) Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Feb. 24, 2020
Mar. 18, 2020
Mar. 16, 2020
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Earnings Per Share [Abstract]            
Antidilutive securities excluded from computation of earnings per share, amount (in shares)       1.9 3.5 1.7
Payment for repurchase of common stock $ 160          
Treasury stock, shares, acquired (in shares) 6.6 11.5 4.9      
Accelerated share repurchases, final price paid per share (in dollars per share)   $ 13.91