Servicing Activities (Schedule Of Servicing Assets at Fair Value) (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
Servicing Activities [Abstract]
Estimated fair value, Beginning Balance	$ 1,105	$ 3,701	$ 2,519	$ 3,738
Additions recognized on sale of mortgage loans	50	159	167	487
Additions from purchases of servicing rights	0	15	0	31
Subtractions from disposition of servicing assets			0	(266)
Servicing Asset at Fair Value, Changes in Fair Value Resulting from Changes in Valuation Inputs or Changes in Assumptions	(192)	(1,106)	(330)	(943)
Servicing Asset at Fair Value, Other Changes in Fair Value	(61)	(106)	(324)	(384)
Deconsolidation of subsidiary			(1,130)	0
Estimated fair value, Ending Balance	$ 902	$ 2,663	$ 902	$ 2,663