Basis of Presentation and Summary of Significant Accounting Policies (Narrative, Recent Financial Accounting Standards) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Inventory, LIFO Reserve, Period Charge	$ (9)	$ 12	$ 0	$ 51
Debt Issuance Costs, Gross	$ 29		$ 29