Servicing Activities (Components Of Servicing Valuation And Hedge Activities) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Components of Servicing Valuation and Hedge Activities [Line Items]
Net realized/unrealized gains (losses) included in earnings, Assets	$ 55	$ (212)	$ (93)	$ (199)
Servicing asset valuation and hedge activities, net	0	134	(213)	74
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	387	(112)	612
Mortgage Servicing Rights [Member]
Components of Servicing Valuation and Hedge Activities [Line Items]
Net realized/unrealized gains (losses) included in earnings, Assets	$ 0	$ (253)	$ (101)	$ (538)