Contingencies And Other Risks (Schedule Of Changes In Reserve And Warranty Obligations) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Loss Contingency [Abstract]
Representation And Warranty Obligations Reserve Beginning Balance	$ 811	$ 830	$ 825	$ 830
Provision for mortgage representation and warranty expenses, Loans sales	4	5	8	11
Provision for mortgage representation and warranty expenses, Change in estimate continuing operations	18	184	37	210
Provision for mortgage representation and warranty expenses	22	189	45	221
Resolved Claims On Unpaid Principal Balance	(45)	(194)	(87)	(228)
Representation And Warranty Obligations Recoveries	1	4	6	6
Deconsolidation of Representation & Warranty Reserve	(665)	0	(665)	0
Representation And Warranty Obligations Reserve Ending Balance	$ 124	$ 829	$ 124	$ 829