Receivables Held For Sale - Allowance for Credit Losses Rollforward (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	$ 1,452	$ 0
Initial valuation allowance for receivables transferred to held for sale during the period	212	1,529
Release of valuation allowance resulting from improvements in fair value	(748)	0
Change in of valuation allowance for collections, loans sold, charged-off, transferred to REO or short sale	(587)	(77)
Balance at end of period	$ 329	$ 1,452