Contingencies And Other Disclosures (Narrative I) (Details) shares in Millions	1 Months Ended	3 Months Ended		9 Months Ended		36 Months Ended
	Oct. 31, 2014 USD ($)	Sep. 30, 2015 USD ($) number shares	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($) number shares	Sep. 30, 2014 USD ($)	Dec. 31, 2007 number	Sep. 25, 2015 USD ($)	Sep. 30, 2013 USD ($)	Mar. 31, 2008 shares
Loss Contingencies [Line Items]
Estimated Litigation Liability		$ 17,100,000		$ 17,100,000
Number of GSEs to which conventional conforming single-family mortgage loans were predominately sold to | number		2		2
Percent Of Repurchase Make Whole Claims Related To Private Whole Loan Sales				47.00%
Loan-to-value ratio at origination				80.00%
Accrued losses on loan repurchase exposure		$ 115,500,000	$ 126,200,000	$ 115,500,000	$ 126,200,000
Unpaid principal balance of servicing portfolio		214,800,000		214,800,000				$ 15,000,000,000
Litigation and regulatory matters		10,922,000	35,390,000	173,422,000	(2,720,000)
Fha Insured [Member]
Loss Contingencies [Line Items]
Amount Of Insurance Recoveries Company Is Pursuing		75,000,000		75,000,000
Litigation Settlement Expense				212,500,000
Mortgage Securitization Litigation [Member]
Loss Contingencies [Line Items]
Investment in proprietary securitizations subject to lawsuits				145,700,000
Investment in proprietary securitizations subject to indemnifications				613,900,000
F H Proprietary Securitization [Member]
Loss Contingencies [Line Items]
Number of securitization trusts active | number						80
Remaining balance in mortgage loans		$ 5,200,000,000		$ 5,200,000,000
Visa Class B Shares [Member]
Loss Contingencies [Line Items]
Number of Visa Class B shares | shares		1.1		1.1					2.4
Additional amount deposited into escrow account by Visa			450,000,000		450,000,000
Cash payment to counterparty	$ 2,400,000
Estimated conversion ratio		165.00%		165.00%
Contingent liability		$ 800,000		$ 800,000
Derivative liability		4,800,000	$ 7,600,000	4,800,000	$ 7,600,000
Historical cost		0		0
Amount disputed related to various items for transfers of subservicers
Loss Contingencies [Line Items]
Actual damages sought by plaintiff				8,600,000
Subservicer expenditure reimbursement amount disputed
Loss Contingencies [Line Items]
Actual damages sought by plaintiff				34,900,000
Arbitration Matter [Member]
Loss Contingencies [Line Items]
Litigation Settlement Expense				11,600,000
Litigation and regulatory matters				11,600,000
Alt-A [Member] | F H Proprietary Securitization [Member]
Loss Contingencies [Line Items]
Remaining balance in mortgage loans		3,700,000,000		3,700,000,000
Jumbo Mortgage Loans [Member] | F H Proprietary Securitization [Member]
Loss Contingencies [Line Items]
Remaining balance in mortgage loans		1,500,000,000		1,500,000,000
Minimum
Loss Contingencies [Line Items]
Estimated reasonably possible losses in excess of currently established liabilities		0		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		$ 70,000,000		$ 70,000,000
Investments Subject To Lawsuits [Member] | Mortgage Securitization Litigation [Member]
Loss Contingencies [Line Items]
Ending certificate balance of the investments subject to lawsuits							$ 204,700,000
Investments percentage performing							85.00%
Cumulative losses on investments, percentage of unpaid balance							7.00%