Servicing Activities (Components Of Servicing Valuation And Hedge Activities) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Components of Servicing Valuation and Hedge Activities [Line Items]
Net realized/unrealized gains (losses) included in earnings, Assets	$ 13	$ (119)
Servicing asset valuation and hedge activities, net	0	(213)	(4)
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	(112)	556
Mortgage Servicing Rights [Member]
Components of Servicing Valuation and Hedge Activities [Line Items]
Net realized/unrealized gains (losses) included in earnings, Assets	$ 0	$ (101)	$ (560)