Contingencies And Other Risks (Schedule Of Changes In Reserve And Warranty Obligations) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Loss Contingency [Abstract]
Representation And Warranty Obligations Reserve Beginning Balance	$ 105	$ 825
Provision for mortgage representation and warranty expenses, Loans sales	4	5
Provision for mortgage representation and warranty expenses, Change in estimate continuing operations	83	19
Provision for mortgage representation and warranty expenses	87	24
Resolved Claims On Unpaid Principal Balance	(23)	(42)
Representation And Warranty Obligations Recoveries	1	4
Representation And Warranty Obligations Reserve Ending Balance	$ 170	$ 811