Loans Held-For-Sale, Net (Schedule Of Higher Risk Mortgage Loans Held-For-Sale) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Loans Receivable Held-for-sale, Net [Abstract]
High original loan-to-value (greater than 100%) mortgage loans	$ 74	$ 378
Held For Sales Mortgage Finance Receivables Interest Only Mortgage Loans	3	10
Higher-risk mortgage loans held-for-sale	$ 77	$ 388