Discontinued Operations And Dispositions (Sale Of Interest In Leveraged Leases) (Details) (Leveraged Leases [Member], Energy Holdings [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Leveraged Leases [Member] | Energy Holdings [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net Proceeds from Sales	$ 175	$ 433	$ 830
Gain (Loss) on the Sales, after-tax	$ 34	$ 30	$ 70