Goodwill and Other Intangible Assets (Fees from Mortgage and Other Loan Servicing) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Finite-Lived Intangible Assets [Line Items]
Fees from Mortgage and Other Loan Servicing	$ 127	$ 127	$ 248	$ 256