Finance Assets, Net (Schedule Of Credit Quality Of Investments In Finance Assets) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Total	$ 2,904	$ 3,786
"AAA/Aaa" To "A-/A3" [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Total	1,137	1,570
"BBB+/Baa1" To "BBB-/Baa3" [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Total	978	1,080
"BB+/Ba1" And Lower [Member]
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]
Total	$ 789	$ 1,136