Consolidated Statements of Equity (Unaudited) (Parenthetical) (USD $) In Millions	6 Months Ended
Jun. 30, 2011
Consolidated Statements of Stockholders Equity [Abstract]
Amount of net income (loss) attributable to noncontrolling interests excluded from noncontrolling interests equity	$ 4

Amount of net income (loss) for the period allocated to noncontrolling shareholders, partners, or other equity holders in one or more of the entities consolidated into the reporting entity's financial statements other than joint ventures, limited partnerships, operating partnerships or interests held by preferred unit holders.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 38
-Subparagraph a

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 38
-Subparagraph c(1)

Name:	us-gaap_MinorityInterestInNetIncomeLossOtherMinorityInterests
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration