Basis of Presentation and Summary of Significant Accounting Policies (Narrative, Receivables) (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount	$ 944	$ 729	$ 687	$ 626
Finance notes and related accrued interest, net, total	63	104
Finance notes and related accrued interest, net, current	$ 7	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	$ 242	206	193	139
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	$ 12	$ 27	$ 14	$ 7