Other Assets (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Other Assets Details [Abstract]
Goodwill	$ 2,749	$ 3,024	$ 3,198
Deferred tax assets, net	2,231	2,110
Prepaid expenses	851	1,626
Other intangible assets, at amortized cost	796	854
Community Reinvestment Act Tax Credit Investments	638	622
Derivative assets	282	711
Restricted cash	477	384
Other	2,045	2,011
Other assets (includes restricted cash of consolidated variable interest entities)	$ 10,069	$ 11,342