Finance Receivables Contractually Required Payments Receivable (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Contractually Required Payments Receivable at Acquisition	$ 799	[1]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Cash Flows Expected to be Collected at Acquisition	728	[1]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value	$ 601	[1]

[1] (a)Certain amounts in this table have been updated as a result of the finalization of acquisition accounting adjustments, including a determination that certain consumer finance receivables should be reclassified from receivables with credit impairment to receivables with no deterioration in credit quality. Accordingly, contractually required payments receivable, cash flows expected to be collected and fair value of $1.2 billion, $1.1 billion and $1.0 billion were reclassified to consumer finance receivables acquired which had no deterioration in credit quality. This reclassification had no material effect on the condensed consolidated balance sheet as of September 30, 2013 or condensed consolidated statements of income and comprehensive income for the three and nine months ended September 30, 2013.