Finance Assets, net (Schedule of Allowance for Losses on Finance Assets) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	$ 42,000,000	$ 42,000,000	$ 52,000,000
Decrease to allowance	(10,000,000)	0	(10,000,000)
Ending balance	$ 32,000,000	$ 42,000,000	$ 42,000,000