Acquired Property, Net (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Acquired Property [Roll Forward]
Beginning balance - Acquired property	$ 11,442	$ 12,307	$ 11,158
Additions	9,382	13,100	16,092
Disposals	(13,343)	(13,965)	(14,943)
Ending balance - Acquired property	7,481	11,442	12,307
Real Estate Owned Valuation Allowance [Roll Forward]
Beginning balance - Valuation allowance	(824)	(686)	(669)
Decrease (Increase) in Valuation allowance	109	(138)	(17)
Ending balance - Valuation allowance	(715)	(824)	(686)
Acquired property, net	6,766	10,618	11,621
Foreclosed Properties Acquired Held-for-Use, Net	$ 85	$ 135	$ 256