Derivatives (Details) (USD $)	Sep. 30, 2012
Derivative [Line Items]
Derivative, Notional Amount	$ 1,500,000,000
Expected Reclassification Adjustment	$ 2,800,000

Monetary amount specified by the derivative(s). Expressed as an absolute value.

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

Name:	invest_DerivativeNotionalAmount
Namespace Prefix:	invest_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant