Finance Receivables And Loans, Net (Summary Of Higher-Risk Mortgage Financing Receivables and Loans) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Loans and Leases Receivable, Net Reported Amount, by Category Alternative [Abstract]
Interest-only mortgage loans	$ 2,262	$ 2,947
Below Market Rate Mortgages	197	248
Total higher-risk mortgage finance receivables and loans	$ 2,459	$ 3,195