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Long-Term Debt Leverage Ratios (Details)
$ in Billions
 3 Months Ended
Oct. 31, 2019
USD ($)
Line of Credit Facility [Line Items]  
Total Consolidated Net Leverage Ratio 29.00%
Minimum Liquidity $ 1.0
Scenario 1  
Line of Credit Facility [Line Items]  
Note Agreement, Covenant Terms 325.00%
Line of Credit Facility, Covenant Terms 1 325.00%
Scenario 2  
Line of Credit Facility [Line Items]  
Note Agreement, Covenant Terms 350.00%
Line of Credit Facility, Covenant Terms 1 350.00%