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Stockholders' Equity (Details)
$ / shares in Units, shares in Millions
 3 Months Ended 12 Months Ended
Dec. 08, 2017
USD ($)
Mar. 31, 2020
$ / shares
shares
Dec. 31, 2020
USD ($)
shares
Dec. 31, 2019
USD ($)
agreement
$ / shares
shares
Dec. 31, 2018
USD ($)
agreement
$ / shares
shares
Dec. 04, 2020
$ / shares
Sep. 19, 2019
USD ($)
Stockholders' Equity Note [Abstract]              
Stock repurchase program, period in force 2 years            
Stock repurchase program, authorized amount | $ $ 750,000,000           $ 800,000,000
ASR agreements | agreement       4 3    
Payments for repurchase of common stock | $     $ 160,000,000 $ 535,000,000 $ 375,000,000    
Treasury stock, shares, acquired (in shares) | shares   13.0   28.1 19.1    
Accelerated share repurchases, final price paid (in dollars per share) | $ / shares       $ 19.02 $ 19.60    
Sale of stock, price (in dollars per share) | $ / shares   $ 12.27          
Shares Issued, Price (in dollars per share) | $ / shares           $ 14.40  
Common stock reserved for issuance (in shares) | shares     26.5        
Treasury stock, shares (in shares) | shares     158.0 145.0