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Basis of Presentation and Summary of Significant Accounting Policies (Narrative, Recent Financial Accounting Standards) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Inventory, LIFO Reserve, Period Charge $ 9 $ 39 $ 9 $ 39
Debt Issuance Costs, Gross $ 29   $ 29