Commitments, Contingencies, Guarantees, and Others - Schedule of Allocation of Representation and Warranty Reserves (Details) (USD $)	49 Months Ended
	Feb. 28, 2009 Subsidiary	Sep. 30, 2014 Subsidiaries	Sep. 30, 2014 Subsidiaries 2005 to 2008 Year	Sep. 30, 2014 Subsidiaries GSEs and Active Insured Securitizations	Sep. 30, 2014 Subsidiaries Inactive Insured Securitizations and Others	Sep. 30, 2014 Subsidiaries Government-sponsored enterprises (“GSEs”) 2005 to 2008 Year	Sep. 30, 2014 Subsidiaries Insured Securitizations 2005 to 2008 Year	Sep. 30, 2014 Subsidiaries Uninsured Securitizations 2005 to 2008 Year	Sep. 30, 2014 Subsidiaries Private Investors 2005 to 2008 Year	Sep. 30, 2014 Subsidiaries Representation and Warranty Liability	Jun. 30, 2014 Subsidiaries Representation and Warranty Liability	Dec. 31, 2013 Subsidiaries Representation and Warranty Liability	Sep. 30, 2013 Subsidiaries Representation and Warranty Liability	Jun. 30, 2013 Subsidiaries Representation and Warranty Liability	Dec. 31, 2012 Subsidiaries Representation and Warranty Liability	Sep. 30, 2014 Subsidiaries Representation and Warranty Liability GSEs and Active Insured Securitizations	Dec. 31, 2013 Subsidiaries Representation and Warranty Liability GSEs and Active Insured Securitizations	Sep. 30, 2014 Subsidiaries Representation and Warranty Liability Inactive Insured Securitizations and Others	Dec. 31, 2013 Subsidiaries Representation and Warranty Liability Inactive Insured Securitizations and Others
Loss Contingencies [Line Items]
Loans sold 2005 to 2008		$ 111,000,000,000	$ 111,000,000,000	$ 27,000,000,000	$ 84,000,000,000	$ 11,000,000,000	$ 20,000,000,000	$ 48,000,000,000	$ 22,000,000,000
Reserve liability										1,080,000,000	1,012,000,000	1,172,000,000	1,145,000,000	1,156,000,000	899,000,000	797,000,000	965,000,000	283,000,000	207,000,000
Original principal balance, sold to third party with repurchase requests							16,000,000,000
Original principal balance, sold to third party without repurchase requests							4,000,000,000
Number of subsidiaries acquired that originated residential mortgage loans	3
Loss contingency, range of loss, portion not accrued										$ 2,300,000,000		$ 2,600,000,000