Contingencies And Other Risks (Schedule Of Changes In Reserve And Warranty Obligations) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Loss Contingency [Abstract]
Representation And Warranty Obligations Reserve Beginning Balance	$ 124	$ 829	$ 825	$ 830
Provision for mortgage representation and warranty expenses, Loans sales	3	5	11	16
Provision for mortgage representation and warranty expenses, Change in estimate continuing operations	30	70	67	280
Provision for mortgage representation and warranty expenses	33	75	78	296
Resolved Claims On Unpaid Principal Balance	(30)	(78)	(117)	(306)
Representation And Warranty Obligations Recoveries	0	3	6	9
Deconsolidation of Representation & Warranty Reserve			(665)	0
Representation And Warranty Obligations Reserve Ending Balance	$ 127	$ 829	$ 127	$ 829