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Stockholders' Equity - Additional Information (Details) - USD ($)
shares in Millions
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Feb. 29, 2016
Class of Stock [Line Items]        
Common shares outstanding plus underlying outstanding stock awards (in shares) 518   512  
Net unrecognized compensation cost related to unvested stock-based compensation arrangements $ 13,900,000,000      
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 2 months 12 days      
Estimated forfeiture rate 27.00%   27.00%  
February 2016 Program        
Class of Stock [Line Items]        
Stock repurchase, authorized amount       $ 5,000,000,000.0
Stock repurchases $ 0 $ 0