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Stockholders' Equity - Narrative (Details) - USD ($)
Sep. 30, 2020
Feb. 28, 2019
Dec. 31, 2018
Convertible Preferred Stock      
Class of Stock [Line Items]      
Preferred stock liquidation preference percentage 4.00%    
2019 Share Repurchase Program      
Class of Stock [Line Items]      
Stock repurchase program authorized amount   $ 1,500,000,000  
2018 Share Repurchase Program      
Class of Stock [Line Items]      
Stock repurchase program authorized amount     $ 1,000,000,000