Contingencies And Other Disclosures (Narrative I) (Details) (USD $)	3 Months Ended	12 Months Ended				3 Months Ended	7 Months Ended	12 Months Ended				3 Months Ended													3 Months Ended
	Mar. 31, 2013 number	Dec. 31, 2008	Mar. 31, 2012	Mar. 25, 2013 First Lien Mortgage Securitizations [Member]	Dec. 31, 2005 First Lien Mortgage Securitizations [Member]	Jun. 30, 2011 Sentinel Litigation [Member]	Jul. 31, 2011 Sentinel Litigation [Member] number	Dec. 31, 2007 Proprietary Securitization [Member] number	Mar. 31, 2013 Single Family Residential Loans [Member]	Mar. 31, 2012 Single Family Residential Loans [Member]	Mar. 31, 2013 M T Arbitration Claim [Member]	Mar. 31, 2013 Mortgage Securitization Litigation [Member]	Mar. 31, 2013 Debit Transaction Sequencing Matter [Member]	Mar. 25, 2013 Federal Home Loan Bank San Francisco [Member]	Mar. 31, 2013 F H Proprietary Securitization [Member]	Mar. 25, 2013 Federal Home Loan Bank Of Atlanta [Member]	Aug. 31, 2012 FHA Insured number	Dec. 31, 2008 FHA Insured number	Mar. 31, 2013 Alternative Mortgage Loans [Member] F H Proprietary Securitization [Member]	Mar. 31, 2013 Jumbo Mortgage Loans [Member] F H Proprietary Securitization [Member]	Mar. 31, 2013 Maximum [Member]	Mar. 31, 2013 Minimum [Member]	Mar. 25, 2013 Two Credit Unions [Member] First Lien Mortgage Securitizations [Member]	Mar. 25, 2013 Two Credit Unions [Member] Home Equity [Member]	Mar. 31, 2013 Home Equity [Member] F H Proprietary Securitization [Member] number	Mar. 25, 2013 Home Equity [Member] F H Proprietary Securitization [Member]	Mar. 25, 2013 Federal Housing Finance Agency [Member] Mortgage Securitization Litigation [Member]	Mar. 25, 2013 Investments Subject To Lawsuits Excluding Fhfa [Member] Mortgage Securitization Litigation [Member]
Loss Contingencies [Line Items]
Number of subsidiaries							2
Number of former employees							2
Original principal balance of HELOCs sold in branch sales subject to repurchase claims											$ 45,500,000
Current UPB of HELOC subject to claims											21,700,000
Charged-off loans											11,900,000
Estimated reasonably possible losses in excess of currently established liabilities																					231,000,000	0
Amount trustee would receive under terms of the settlement							38,500,000
Settlement expense						36,700,000
Actual damages sought by plaintiff													5,000,000
Subservicer expenditure reimbursement amount disputed	34,900,000
Loans originated and sold to Agencies		69,500,000,000
Loans securitized, without recourse in proprietary transactions								26,700,000,000
Number of active securitization trusts																									3
Loans sold on full recourse basis with servicing retained									34,000,000	42,300,000
Number of securitization trusts								80
Remaining balance in mortgage loans															8,200,000,000				5,500,000,000	2,700,000,000
Stated percentage of voting rights	25.00%
Original combined certificate balances of investments subject to subpoena														501,100,000		56,100,000							321,600,000	299,800,000
Total original certificate balance with monoline insurance					25,000,000
Total current certificate balance with monoline insurance				23,700,000
Current combined certificate balances of investments subject to subpoena														160,500,000		13,600,000							127,200,000	94,800,000
Purchase price of senior certificates												331,400,000
Investment in proprietary securitizations subject to litigation												1,200,000,000
Ending certificate balance of the investments subject to lawsuits																											331,600,000	285,900,000
Investments percentage performing																											85.00%	80.00%
Cumulative losses on investments, percentage of unpaid balance																											7.00%	5.00%
Cumulative original note balances of the HELOC proprietary securitizations																										961,800,000
Current note balances of the HELOC proprietary securitizations																										350,200,000
Unpaid principal balance of loans sold where private mortgage insurance had been cancelled	454,700,000		367,100,000
Number of monoline insurers who have commenced review of certain HELOC securitization																									2
Estimated Litigation Liability	38,200,000
Number of GSEs to which conventional conforming single-family mortgage loans were predominately sold to	2
Number of years of the subservicing arrangement	3 years
Loans sold to GSEs		57,600,000,000
Loans guaranteed by Ginnie Mae		11,900,000,000
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
Number Of Loans Originated During The 4 Years After The Divestiture Of The National Mortgage Platform																	2,681
Amount Of Loans Originated During The 4 Years After The Divestiture Of The National Mortgage Platform																	$ 356,500,000