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Stockholders' Deficit - Narrative (Details) - USD ($)
shares in Millions
1 Months Ended 3 Months Ended
Sep. 30, 2019
Jun. 19, 2018
Feb. 29, 2020
Feb. 28, 2019
Jan. 31, 2020
Jan. 31, 2019
Feb. 22, 2020
Stockholders' Equity Note [Abstract]              
Repurchases of common stock (shares)         34.0 32.0  
Payment in connection with repurchases of shares         $ 691,000,000 $ 720,000,000  
Subsequent Event [Line Items]              
Share repurchases that will be settled in subsequent period (shares)       0.9      
Share repurchase increase in authorization $ 5,000,000,000.0 $ 4,000,000,000.0          
Share repurchase authorization remaining         $ 5,800,000,000    
Subsequent event              
Subsequent Event [Line Items]              
Share repurchases that will be settled in subsequent period (shares)     1.3        
Authorized repurchase amount             $ 15,000,000,000.0