Loan Servicing (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2015
Loan Servicing
Potential Exposure Related To Losses Incurred By FHA On Defaulted Loans Minimum Value		$ 25
Potential Exposure Related To Losses Incurred By FHA On Defaulted Loans Maximum Value		$ 105
Expense Recognized Related to Exposure to Losses Incurred by FHA On Defaulted Loans Reserve Amount	$ 85
Adjustment to Indemnification Reserves for FHA Insured Mortgage Loans Sold	$ 33