Finance Receivables And Loans, Net (Summary Of Higher-Risk Mortgage Financing Receivables and Loans) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Risks and Uncertainties [Abstract]
Interest-only mortgage loans	$ 1,600	$ 2,063
Below Market Rate Mortgages	168	192
Total higher-risk mortgage finance receivables and loans	$ 1,768	$ 2,255