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Unearned Revenue and Performance Obligations - Transaction Price Allocated to the Remaining Performance Obligations (Details) - Subscription services
$ in Millions
Jul. 31, 2021
USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Revenue is expected to be recognized from remaining performance obligations for subscription contracts $ 10,580
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-08-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Revenue is expected to be recognized from remaining performance obligations for subscription contracts $ 6,880
Recognition period 24 months