Value received from shareholders in nonredeemable preferred stock related transactions that are in excess of par value, value contributed to an entity and value received from other stock related transactions. Examples of other stock related transactions include, amongst other, certain costs incurred in issuing equity securities, certain dividends and certain tax-based consequences of share-based payments compensation awards. Includes only nonredeemable preferred stock transactions or transactions related to preferred stock that are redeemable solely at the option of the issuer. May be called contributed capital, capital in excess of par, capital surplus, or paid-in capital.

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 31

-Article 5

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.30(a)(1),(2))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Name:	us-gaap_AdditionalPaidInCapitalPreferredStock
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Condensed Consolidated Statements Of Changes In Equity (Parenthetical) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2011	Dec. 31, 2010
Common Stock [Member]
Additional Paid-in Capital, value of stock	$ 2	$ 1	$ 1	$ 1
Preferred Stock [Member]
Additional Paid-in Capital, value of stock				$ 1