Finance Assets, net (Narrative) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended				3 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Dec. 31, 2011	Sep. 30, 2012 American [Member]	Sep. 30, 2012 American [Member]	Sep. 30, 2013 Marketing, Adminstration and Research Costs [Member]	Sep. 30, 2012 Marketing, Adminstration and Research Costs [Member]	Sep. 30, 2013 Finance Leases [Member]	Dec. 31, 2012 Finance Leases [Member]	Sep. 30, 2013 Unconditional Contractual Receviable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance assets, net	$ 2,153		$ 2,581						$ 2,194		$ 11
Allowance for losses	52
Allowance for credit losses	52	99	99	227
Gross investments in finance leases									2,205	2,680
Decrease to allowance	47	10					(47)	(10)
Amounts written-off	0	118				118
Deferred taxes						22
Recoveries from sale of bankruptcy claim					$ 33