Finance Assets, net (Schedule of Credit Quality of Investments in Finance Leases) (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Financing Receivable, Recorded Investment [Line Items]
Gross investments in finance leases	$ 1,825	$ 2,049
Finance Leases Financing Receivable [Member] | Standard and Poors AAA to A minus [Member] | Moodys Aaa to A3 [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross investments in finance leases	434	464
Finance Leases Financing Receivable [Member] | Standard and Poors BBB plus to BBB minus [Member] | Moodys Baa1 to Baa3 [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross investments in finance leases	782	927
Finance Leases Financing Receivable [Member] | Standard and Poors BB Plus and Lower [Member] | Moodys Ba1 and Lower [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross investments in finance leases	$ 609	$ 658