Finance Assets, net (Schedule of Credit Quality of Investments in Finance Assets) (Details) (Finance Leases [Member], USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Financing Receivable, Recorded Investment [Line Items]
Gross investments in finance leases	$ 2,205	$ 2,680
Standard and Poors Moodys AAA or Aaa to A minus or A3 [Member] | Standard and Poors AAA to A minus [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross investments in finance leases	611	961
Standard and Poors or Moodys BBB plus or Baa1 To BBB minus or Baa3 [Member] | Standard and Poors BBB plus to BBB minus [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross investments in finance leases	931	938
Standard and Poors or Moodys BB plus or Ba1 and Lower [Member] | Standard and Poors BB Plus and Lower [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross investments in finance leases	$ 663	$ 781