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Basis of Presentation and Summary of Significant Accounting Policies (Narrative, Receivables) (Details) - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Valuation Allowances and Reserves, Balance $ 494 $ 541 $ 455 $ 429
Finance notes and related accrued interest, net, total 171 145    
Finance notes and related accrued interest, net, current $ 53 31    
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      
Allowance for Trade Receivables [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Valuation Allowances and Reserves, Balance $ 137 135 135 137
Allowance for Losses on Finance Receivables [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Valuation Allowances and Reserves, Balance     $ 14 $ 18
Allowance for doubtful accounts $ 9 $ 19