Finance Assets, net (Schedule of Allowance for Losses on Finance Assets) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended									12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Sep. 30, 2011	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance				$ 99				$ 227		$ 99	$ 227	$ 202
(Decrease) increase to allowance	0	0	(27)	(20)	0	(33)	(11)	0	(35)	(47)	(10)	25
Amounts written-off										0	(118)	0
Ending balance	$ 52				$ 99					$ 52	$ 99	$ 227