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Stockholders' Equity - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Apr. 26, 2018
Equity, Class of Treasury Stock [Line Items]      
Treasury stock (in shares) 130,592,000 126,893,000  
Authorized share repurchase   20,000,000 15,000,000
Stock repurchases (in shares) 3,400,000    
Stock repurchased, value $ 370    
Average repurchase price per share (in dollars per share) $ 109.88    
Shares authorized and remaining under the repurchase program 23,300,000    
Share-based compensation arrangement by share-based payment award, options and equity instruments other than options, outstanding (in shares) 18,000,000    
Share-based compensation arrangement by share-based payment award, options, outstanding (in shares) 12,000,000    
Weighted average exercise price (in dollars per share) $ 104.82    
Options, weighted average remaining contractual term 3 years 2 months 12 days    
Common stock      
Equity, Class of Treasury Stock [Line Items]      
Treasury stock (in shares) 123,300,000 119,600,000  
Class B Common Stock      
Equity, Class of Treasury Stock [Line Items]      
Treasury stock (in shares) 7,300,000 7,300,000  
Restricted Stock Units (RSUs)      
Equity, Class of Treasury Stock [Line Items]      
Equity instruments other than options, outstanding (in shares) 6,000,000    
Grants in period (in shares) 3,000,000    
Employee Stock      
Equity, Class of Treasury Stock [Line Items]      
Award vesting period 4 years    
Share-based Payment Arrangement, Tranche One | Restricted Stock Units (RSUs)      
Equity, Class of Treasury Stock [Line Items]      
Award vesting rights, percentage 25.00% 25.00%  
Award vesting period 1 year 1 year  
Share-based Payment Arrangement, Tranche Two | Restricted Stock Units (RSUs)      
Equity, Class of Treasury Stock [Line Items]      
Award vesting period 3 years 3 years