Basis of Presentation and Summary of Significant Accounting Policies Basis of Presentation and Summary of Significant Accounting Policies (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
Basis of Presentation and Summary of Significant Accounting Policies [Line Items]
Proceeds from Sale of Other Investments	$ 47
Gain on Sale of Investments	$ 32	$ 5	$ 32