Basis of Presentation (Details Textuals) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Investments in Affordable Housing Projects [Abstract]
Loss from Affordable Housing Projects, Equity Method Investments	$ 14	$ 7	$ 34	$ 39
Affordable Housing Tax Credit And Other Tax Benefits, Amount	15	$ 12	39	$ 30
Qualified Affordable Housing Project, Investments	605		605		$ 522
Qualified Affordable Housing Project Investments, Commitment	$ 134		$ 134
Affordable Housing Tax Credits Commitment, Year to be Paid	between 2015 and 2023