Receivables Receivables - Retrospective Review of Trouble Debt Restructuring (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
New TDR Loan Volume Upon Adoption of New Accounting Standards Update [Abstract]
Interest rate modification	$ 219	$ 728
Re-age of past due account	356	795
Total modifications	$ 575	$ 1,523

Financing Receivable, Modifications, Interest Rate Modifications

No definition available.

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