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Stockholders' Equity - Additional Information (Details) - USD ($)
shares in Millions
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Feb. 29, 2016
Class of Stock [Line Items]        
Common shares outstanding plus underlying outstanding stock awards 517   512  
Net unrecognized compensation cost related to unvested stock-based compensation arrangements $ 13,100,000,000      
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      
Share-Based Compensation Arrangement By Share-Based Payment Award, Fair Value Assumptions, Forfeiture Rate 27.00%   27.00%  
February 2016 Program        
Class of Stock [Line Items]        
Stock repurchase, authorized amount       $ 5,000,000,000.0
Stock Repurchased During Period, Value $ 0 $ 0