Contingencies And Other Disclosures (Narrative I) (Details) (USD $)	3 Months Ended	48 Months Ended	96 Months Ended				1 Months Ended	3 Months Ended								3 Months Ended					1 Months Ended		3 Months Ended			3 Months Ended			3 Months Ended				3 Months Ended
	Mar. 31, 2012	Dec. 31, 2008	Dec. 31, 2007	Mar. 26, 2012	Mar. 31, 2011	Mar. 26, 2012 First Lien Mortgage Securitizations [Member]	Jul. 31, 2011 Sentinel Litigation [Member] employee lawsuit	Jun. 30, 2011 Sentinel Litigation [Member]	Mar. 31, 2012 Proprietary Securitization [Member]	Mar. 31, 2012 Single-Family Residential Loans [Member]	Mar. 31, 2011 Single-Family Residential Loans [Member]	Mar. 31, 2012 Mortgage Loans Serviced For Government Sponsored Enterprises [Member]	Mar. 31, 2012 HELOC [Member]	Mar. 31, 2012 M&T Arbitration Claim [Member]	Mar. 31, 2012 Active Securitizations [Member]	Mar. 31, 2012 Investments Subject To Subpoena [Member]	Mar. 31, 2012 Mortgage Securitization Litigation [Member] lawsuit	Mar. 26, 2012 Mortgage Securitization Litigation [Member]	Sep. 30, 2011 Mortgage Securitization Litigation [Member] lawsuit	Dec. 31, 2010 Mortgage Securitization Litigation [Member] lawsuit	Sep. 30, 2011 Debit Transaction Sequencing Matter [Member]	Mar. 26, 2012 FHLB SF [Member]	Mar. 31, 2012 VA Loan Guarantee Matter [Member] defendant	Mar. 31, 2012 Alt-A [Member]	Mar. 31, 2012 Jumbo [Member]	Mar. 31, 2012 Maximum [Member] Y	Mar. 31, 2012 Maximum [Member] M&T Arbitration Claim [Member]	Mar. 31, 2012 Maximum [Member] VA Loan Guarantee Matter [Member]	Mar. 31, 2012 Minimum [Member] Y	Mar. 31, 2012 Minimum [Member] M&T Arbitration Claim [Member]	Mar. 26, 2012 Two Credit Unions [Member] First Lien Mortgage Securitizations [Member]	Mar. 26, 2012 Two Credit Unions [Member] HELOC [Member]	Mar. 31, 2012 First Lien [Member] Investments Subject To Subpoena [Member]	Mar. 31, 2012 HELOC [Member] Investments Subject To Subpoena [Member]	Mar. 31, 2012 Federal Housing Finance Agency [Member]	Mar. 31, 2012 Federal Housing Finance Agency [Member] Mortgage Securitization Litigation [Member]	Mar. 26, 2012 Federal Housing Finance Agency [Member] Mortgage Securitization Litigation [Member]
Loss Contingencies [Line Items]
Number of subsidiaries							2
Number of former employees							2
Periods principal and interest distributions received by investors, in years																										7			5
Original principal balance of HELOCs sold in branch sales subject to repurchase claims														$ 45,500,000
Current UPB of HELOC subject to claims														24,600,000
Charged-off loans														11,700,000
Estimated reasonably possible losses in excess of currently established liabilities																											16,000,000	70,000,000		0
Number of lawsuits																	4		2	2
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
Number of mortgage lenders																							13
Original unpaid principal balance of servicing portfolio												6,300,000,000
Current unpaid principal balance of servicing portfolio												5,700,000,000
Subservicer expenditure reimbursement amount disputed	7,400,000
Loans originated and sold to GSEs		69,500,000,000
Loans securitized, without recourse in proprietary transactions			47,000,000,000
Loans securitized related to active securitization trusts	36,700,000,000
Number of active securitization trusts									110
Number of securitization trusts inactive									30
Loans sold on full recourse basis with servicing retained										42,300,000	55,700,000
Number of securitization trusts									140																								13	1
Number of federal credit unions invested in proprietary securitizations																2
Remaining balance in mortgage loans	11,600,000,000																							7,000,000,000	4,600,000,000
Stated percentage of voting rights	25.00%
Total original certificate balance with monoline insurance	128,400,000					97,400,000									103,400,000
Number of agencies																4
Original combined certificate balances of investments subject to subpoena																						601,100,000									321,600,000	299,800,000
Current combined certificate balances of investments subject to subpoena																						206,200,000									151,100,000	113,800,000
Number of trusts in which home equity lines and loans were securitized	7												6
Purchase price of senior certificates	100,100,000
Investment in proprietary securitizations subject to litigation																	1,100,000,000
Ending certificate balance of the investments subject to lawsuits																		535,600,000																			364,400,000
Investments percentage performing																																				80.00%
Cumulative losses on investments, percentage of unpaid balance																																			5.00%
Cumulative original note balances of the HELOC proprietary securitizations				1,000,000,000
Original note balances of the closed-end second lien securitization				236,300,000
Current note balances of the closed-end second lien securitization				22,500,000
Current note balances of the HELOC proprietary securitizations				400,000,000
Unpaid principal balance of loans sold where private mortgage insurance had been cancelled	$ 367,100,000				$ 156,500,000
Number of defendants who recently settled																							2