Servicing Activities (Schedule Of Servicing Assets at Fair Value) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Servicing Activities [Abstract]
Estimated fair value, Beginning Balance	$ 917	$ 2,595	$ 952	$ 2,519
Servicing Asset at Fair Value, Additions	6	42	60	117
Servicing Asset at Fair Value, Disposals	(911)	0	(911)	0
Servicing Asset at Fair Value, Changes in Fair Value Resulting from Changes in Valuation Inputs or Changes in Assumptions	(4)	(301)	(32)	(138)
Servicing Asset at Fair Value, Other Changes in Fair Value	(8)	(101)	(69)	(263)
Deconsolidation of subsidiary	0	(1,130)	0	(1,130)
Estimated fair value, Ending Balance	$ 0	$ 1,105	$ 0	$ 1,105