Finance Assets, net (Schedule of Credit Quality of Investments in Finance Leases) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Financing Receivable, Recorded Investment [Line Items]
Gross investments in finance leases	$ 2,049	$ 2,680
Finance Leases Financing Receivable [Member] | Standard & Poor's AAA To A Minus [Member] | Moodys Aaa to A3 [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross investments in finance leases	464	961
Finance Leases Financing Receivable [Member] | Standard & Poor's BBB Plus To BBB Minus [Member] | Moodys Baa1 to Baa3 [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross investments in finance leases	927	938
Finance Leases Financing Receivable [Member] | Standard & Poor's BB Plus And Lower [Member] | Moodys Ba1 and Lower [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross investments in finance leases	$ 658	$ 781