Finance Assets, net (Schedule of Allowance for Losses on Finance Assets) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	$ 42	$ 52	$ 99
Decrease to allowance	0	(10)	(47)
Ending balance	$ 42	$ 42	$ 52