Contingencies And Other Disclosures (Narrative I) (Details) (USD $) Share data in Millions, unless otherwise specified	3 Months Ended		32 Months Ended	12 Months Ended	1 Months Ended
	Mar. 31, 2015 number	Mar. 31, 2014	Aug. 31, 2008	Dec. 31, 2007 number	Oct. 31, 2014	Sep. 30, 2013	Sep. 30, 2014	Mar. 31, 2008	Mar. 25, 2015
Loss Contingencies [Line Items]
Estimated Litigation Liability	$ 218,700,000
Number of GSEs to which conventional conforming single-family mortgage loans were predominately sold to	2
Percent Of Repurchase Make Whole Claims Related To Private Whole Loan Sales	48.00%
Loan-to-value ratio at origination	80.00%
Accrued losses on loan repurchase exposure	117,100,000	145,700,000
Unpaid principal balance of servicing portfolio	241,700,000					15,000,000,000
Number of years of the subservicing arrangement			3 years
Amount disputed related to various items for transfers of subservicers	8,600,000
Subservicer expenditure reimbursement amount disputed	34,900,000
Litigation And Regulatory Matters	162,500,000	90,000
Fha Insured [Member]
Loss Contingencies [Line Items]
Estimated Litigation Liability	212,500,000
Number Of Loans Originated From 2006 to 2008 Divestiture Of The National Mortgage Platform			47,817
Amount Of Loans Originated From 2006 to 2008 Divestiture Of The National Mortgage Platform			8,200,000,000
Amount Of Insurance Recoveries Company Is Pursuing	75,000,000
Mortgage Securitization Litigation [Member]
Loss Contingencies [Line Items]
Investment in proprietary securitizations subject to lawsuits	195,700,000
Investment in proprietary securitizations subject to indemnifications	613,900,000
F H Proprietary Securitization [Member]
Loss Contingencies [Line Items]
Number of securitization trusts Active				80
Remaining balance in mortgage loans	5,900,000,000
Visa Class B Shares [Member]
Loss Contingencies [Line Items]
Number of Visa Class B shares	1.1							2.4
Additional amount deposited into escrow account by Visa							450,000,000
Cash payment to counterparty					2,400,000
Estimated conversion ratio	165.00%
Contingent liability	800,000
Derivative liability	5,000,000	4,900,000
Historical cost	0
Alt-A [Member] | F H Proprietary Securitization [Member]
Loss Contingencies [Line Items]
Remaining balance in mortgage loans	4,100,000,000
Jumbo Mortgage Loans [Member] | F H Proprietary Securitization [Member]
Loss Contingencies [Line Items]
Remaining balance in mortgage loans	1,800,000,000
Minimum
Loss Contingencies [Line Items]
Estimated reasonably possible losses in excess of currently established liabilities	0
Minimum | Debit Transaction Sequencing Matter [Member]
Loss Contingencies [Line Items]
Actual damages sought by plaintiff	5,000,000
Maximum
Loss Contingencies [Line Items]
Estimated reasonably possible losses in excess of currently established liabilities	100,000,000
Investments Subject To Lawsuits [Member] | Mortgage Securitization Litigation [Member]
Loss Contingencies [Line Items]
Ending certificate balance of the investments subject to lawsuits and indemnification requests									$ 239,100,000
Investments percentage performing									85.00%
Cumulative losses on investments, percentage of unpaid balance									6.00%