Goodwill and Other Intangible Assets (Narrative) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Mortgage servicing rights	$ 1,222,000,000		$ 1,222,000,000		$ 1,589,000,000
Fees from Mortgage and Other Loan Servicing	$ 100,000,000	$ 100,000,000	$ 300,000,000	$ 200,000,000