Derivatives and Other Hedging Instruments (Fair Value Hedges) (Narrative) (Details) (Interest Rate Swaps [Member], USD $) In Millions	Jun. 30, 2011	Dec. 31, 2010
Interest Rate Swaps [Member]
Notional amount	$ 1,000	$ 1,000

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