Financing Receivables Financing Receivables (Purchases and Sales) (Details 2) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses
Loans purchased	$ 227	$ 158	$ 162
Loans sold	13	3	464
Consumer loans [Member]
Financing Receivable, Allowance for Credit Losses
Loans purchased			51
Loans sold			452
Syndicated loans [Member]
Financing Receivable, Allowance for Credit Losses
Loans purchased	227	158	111
Loans sold	$ 13	$ 3	$ 12