Finance Assets, net (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014	Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance assets, net	$ 1,339	$ 1,339		$ 1,614
Allowance for credit losses	42	42	$ 42	42	$ 52
(Decrease) increase to allowance		0	(10)
Decrease to unguaranteed residual values	35		0
Finance Leases Financing Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Investments in finance leases	1,381	$ 1,381		$ 1,656
Decrease in Unguaranteed Residual Value Resulting in Reduction to Net Revenues [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Reduction in net revenues	$ 29		$ 0