Servicing Activities (Components Of Servicing Valuation And Hedge Activities) (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
Components of Servicing Valuation and Hedge Activities [Line Items]
Net realized/unrealized gains (losses) included in earnings, Assets	$ (17)	$ (47)	$ (148)	$ 13
Servicing asset valuation and hedge activities, net	(12)	46	(213)	(60)
Not Designated as Hedging Instrument [Member] | Interest Rate Contract [Member]
Components of Servicing Valuation and Hedge Activities [Line Items]
Servicing asset valuation and hedge activities, net	0	321	(112)	225
Mortgage Servicing Rights [Member]
Components of Servicing Valuation and Hedge Activities [Line Items]
Net realized/unrealized gains (losses) included in earnings, Assets	$ (12)	$ (275)	$ (101)	$ (285)