Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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 04

-Article 3

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30

-Article 5

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

Consolidated Statement of Changes in Equity (Unaudited) (Parenthetical) - Private Forward Repurchase Transaction [Member] - USD ($) shares in Millions	1 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Apr. 30, 2015	Jun. 30, 2014
Consolidated Statement of Changes in Equity (Textuals) [Abstract]
Common stock repurchased, shares		19.5
Private forward repurchase contract			$ 750,000,000	$ 1,000,000,000
Subsequent Event [Member]
Consolidated Statement of Changes in Equity (Textuals) [Abstract]
Common stock repurchased, shares	13.6