Basis of Presentation and Summary of Significant Accounting Policies (Narrative, Goodwill and Other Intangible Assets) (Details) $ in Millions	12 Months Ended
	Jun. 30, 2020 USD ($) segment	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2017 USD ($)
Goodwill and Intangible Assets [Line Items]
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount	$ 729	$ 626	$ 687	$ 494
Goodwill, Impairment Loss		1,400
Discount Rate, fair value inputs	8.50%
Number of Operating Segments | segment	2
Minimum
Goodwill and Intangible Assets [Line Items]
Discount Rate, fair value inputs	8.50%
Maximum
Goodwill and Intangible Assets [Line Items]
Discount Rate, fair value inputs	10.50%
SEC Schedule, 12-09, Allowance, Loss on Finance Receivable [Member]
Goodwill and Intangible Assets [Line Items]
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount	$ 27	$ 7	$ 14	$ 9