Equity (Details) $ in Billions		3 Months Ended
Apr. 02, 2015 USD ($)	Mar. 31, 2015 item shares
Equity
Period common stock is authorized to repurchase	24 months
Partnership agreement of Operating Partnership
Equity
Common stock, shares issued \| shares		483,154
The number of limited partners who received common stock in exchange for an equal number of units, during the period. \| item		5
Maximum
Equity
Common stock authorized for repurchase \| $	$ 2.0

Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.29)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 30
-Article 5

Name:	us-gaap_CommonStockSharesIssued
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant