Servicing Activities (Schedule Of Servicing Assets at Fair Value) (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
Servicing Activities [Abstract]
Estimated fair value, Beginning Balance	$ 2,595	$ 3,774	$ 2,519	$ 3,738
Additions recognized on sale of mortgage loans	0	144	0	328
Additions from purchases of servicing rights	42	15	117	16
Subtractions from disposition of servicing assets	0	0	0	(266)
Servicing Asset at Fair Value, Changes in Fair Value Resulting from Changes in Valuation Inputs or Changes in Assumptions	(301)	(135)	(138)	163
Servicing Asset at Fair Value, Other Changes in Fair Value	(101)	(97)	(263)	(278)
Deconsolidation of subsidiary	(1,130)	0	(1,130)	0
Estimated fair value, Ending Balance	$ 1,105	$ 3,701	$ 1,105	$ 3,701