Goodwill and Other Intangible Assets (Narrative) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Mortgage servicing rights	$ 1,558	$ 1,351
Customer-Related and Other Intangible Assets [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite Lived Intangible Asset Useful Life	1 year
Customer-Related and Other Intangible Assets [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite Lived Intangible Asset Useful Life	10 years
Customer-Related and Other Intangible Assets [Member] | Weighted Average [Member]
Finite-Lived Intangible Assets [Line Items]
Finite Lived Intangible Asset Useful Life	6 years