Securities (Details 7) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 Residential mortgage-backed securities, U.S. government agency and government-sponsored agencies	Dec. 31, 2012 Residential mortgage-backed securities, U.S. government agency and government-sponsored agencies	Dec. 31, 2013 Commercial mortgage-backed securities	Dec. 31, 2012 CLOs	Sep. 30, 2012 CLOs
Securities held to maturity
Over One Year Through Five Years, Carrying Amount	$ 4		$ 4
Over Five Years Through Ten Years, Carrying Amount	835				835
Over Ten Years, Carrying Amount	5,670		4,991		679
Total securities held to maturity, carrying amount	6,509	1,103	4,995	1,002	1,514	101	1,100
Over One Year Through Five Years, Fair Value	4		4
Over Five Years Through Ten Years, Fair Value	834				834
Over Ten Years, Fair Value	5,601		4,930		671
Total securities held to maturity, Fair Value	$ 6,439	$ 1,135	$ 4,934	$ 1,014	$ 1,505	$ 121