Number of shares that have been repurchased during the period and are being held in treasury.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30

-Article 5

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

Name:	us-gaap_TreasuryStockSharesAcquired
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

Equity Stock Offering (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended	60 Months Ended
	Jun. 30, 2015	Jun. 30, 2015	May. 18, 2015
Class of Stock [Line Items]
sale of shares by noncontrolling interest			$ 60
Sale of shares by noncontrolling interest, per share			$ 13.25
Treasury Stock, Shares, Acquired	20.8	129.5
Common Stock [Member]
Class of Stock [Line Items]
sale of shares by noncontrolling interest			$ 40