Finance Receivables And Loans, Net (Schedule Of Sales Of Financing Receivables And Loans) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Sales	$ 10	$ 1,995	$ 2,010	$ 3,412
Consumer Loans Auto Financing Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Sales	0	1,961	1,960	3,279
Residential Mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Sales	0	7	40	100
Commercial Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Sales	$ 10	$ 27	$ 10	$ 33