Acquired Property Net (Held-for-Use) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Foreclosed Properties Acquired Held-for-Use [Roll Forward]
Beginning balance, January 1	$ 873	$ 835	$ 889
Transfers in from held for sale, net and additions	544	1,173	1,045
Transfers to held for sale, net	(1,027)	(748)	(547)
Depreciation, asset write−downs and other	(134)	(387)	(552)
Ending balance, December 31	$ 256	$ 873	$ 835