Risk Management, Derivative Instruments And Hedging Activities (Notional Amounts of Derivative Instruments Related to Interest Rate Risk) (Details) (USD $)	Sep. 30, 2011	Dec. 31, 2010
Risk Management, Derivative Instruments And Hedging Activities
Cash Flow Hedges	$ 846,000,000.00	$ 492,000,000	[1]
Undesignated Contracts	748,000,000.00	561,000,000
Fair Value Hedges	275,000,000.00	275,000,000
Total Notional Amount	$ 1,869,000,000.00	$ 1,328,000,000

[1] Includes amounts related to non-recourse variable rate long-term debt of VIEs of $470 million at September 30, 2011 and $492 million at December 31, 2010.