Loans Held-For-Sale, Net (Schedule Of Higher Risk Mortgage Loans Held-For-Sale) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Loans Receivable Held-for-sale, Net [Abstract]
High original loan-to-value (greater than 100%) mortgage loans	$ 336	$ 423
Payment-option adjustable-rate mortgage loans	0	12
Interest-only mortgage loans	9	298
Below-market rate (teaser) mortgages	0	169
Total higher-risk mortgage loans held-for-sale	$ 345	$ 902