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Basis of Presentation and Summary of Significant Accounting Policies (Narrative, Receivables) (Details) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]        
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount $ 729 $ 687 $ 626 $ 494
Finance notes and related accrued interest, net, total 104 103    
Finance notes and related accrued interest, net, current $ 12 12    
Minimum        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Receivable financing agreement term 1 year      
Maximum        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Receivable financing agreement term 5 years      
SEC Schedule, 12-09, Allowance, Credit Loss [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount $ 206 193 139 137
SEC Schedule, 12-09, Allowance, Loss on Finance Receivable [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount $ 27 $ 14 $ 7 $ 9