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Stockholders' Equity - Additional Information (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Feb. 29, 2016
Class of Stock [Line Items]        
Preferred stock, authorized shares 500,000,000 500,000,000    
Preferred stock, par value (in usd per share) $ 0.01 $ 0.01    
Preferred stock, outstanding shares 0 0    
Common shares outstanding plus underlying outstanding stock awards 512,000,000 507,000,000 504,000,000  
Stock Repurchased During Period, Value $ 0 $ 0 $ 0  
Net unrecognized compensation cost related to unvested stock-based compensation arrangements $ 8,800,000,000      
Compensation cost expected to be expensed in next twelve months, percentage 50.00%      
Net unrecognized compensation cost related to unvested stock-based compensation arrangements, weighted average recognition period (in years) 1 year 1 month 6 days      
Estimated forfeiture rate 27.00% 27.00% 28.00%  
Common stock available for future issuance to employees (in shares) 108,000,000      
Restricted Stock Units        
Class of Stock [Line Items]        
Fair value of units vested $ 11,700,000,000 $ 11,400,000,000 $ 6,800,000,000  
Minimum        
Class of Stock [Line Items]        
Award vesting period 2 years      
Maximum        
Class of Stock [Line Items]        
Award vesting period 5 years      
February 2016 Program        
Class of Stock [Line Items]        
Stock repurchase, authorized amount       $ 5,000,000,000.0