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Revenue - Schedule of Internal Risk Ratings for Contract Assets (Details)
$ in Millions
Jul. 31, 2021
USD ($)
Financing Receivable, Credit Quality Indicator [Line Items]  
Gross contract assets $ 1,457
1 to 4  
Financing Receivable, Credit Quality Indicator [Line Items]  
Gross contract assets 521
5 to 6  
Financing Receivable, Credit Quality Indicator [Line Items]  
Gross contract assets 770
7 and Higher  
Financing Receivable, Credit Quality Indicator [Line Items]  
Gross contract assets $ 166