Finance Assets, net (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance assets, net			$ 1,046	$ 1,239
Investments in finance leases			1,079	1,281
Allowance for credit losses			33	42	$ 42	$ 42
Residual value of leased assets adjustment	$ 28	$ 35
Decrease in Unguaranteed Residual Value Resulting in Reduction to Net Revenues [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Leveraged lease net revenue	$ 18	$ 29
Finance Leases Financing Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Investments in finance leases			$ 1,079	$ 1,281