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Stockholders' Deficit - Narrative (Details) - USD ($)
shares in Millions, $ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
May 31, 2021
Apr. 30, 2021
Apr. 30, 2020
Apr. 30, 2021
Apr. 30, 2020
Stockholders' Equity Note [Abstract]          
Repurchases of common stock (shares)   52 4 113 39
Payment in connection with repurchases of shares   $ 1,600 $ 100 $ 2,988 $ 814
Share repurchase authorization remaining   $ 9,700   $ 9,700  
Subsequent event          
Subsequent Event [Line Items]          
Shares settled (in shares) 2