Basis of Presentation and Summary of Significant Accounting Policies (Narrative, Investments) (Details) - USD ($) $ in Millions	12 Months Ended
Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Accounting Policies [Abstract]
Proceeds from sale of investments			$ 47
Gain on sale of investments	$ 0	$ 5	32
Gain on sale of investment, net of tax			$ 20

Amount of cash inflow from the sale of investments classified as other.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3179-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 24
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3521-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 26
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3574-108585

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration