Basis of Presentation and Summary of Significant Accounting Policies (Narrative, Receivables) (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount	$ 626	$ 494	$ 541	$ 455
Finance notes and related accrued interest, net, total	136	171
Finance notes and related accrued interest, net, current	$ 26	53
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	$ 139	137	135	135
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	$ 7	$ 9	$ 19	$ 14