Commitments, Contingencies, Guarantees, and Others - Schedule of Allocation of Representation and Warranty Reserves (Details) $ in Millions	12 Months Ended		49 Months Ended
	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Feb. 28, 2009 Subsidiary	Dec. 31, 2013 USD ($)
Loss Contingencies [Line Items]
Number of subsidiaries acquired that originated residential mortgage loans | Subsidiary			3
Subsidiaries | 2005 to 2008 Year
Loss Contingencies [Line Items]
Loans sold 2005 to 2008	$ 111,000
Subsidiaries | Active Insured Securitizations and GSEs
Loss Contingencies [Line Items]
Loans sold 2005 to 2008	27,000
Subsidiaries | Inactive Insured Securitizations and Others
Loss Contingencies [Line Items]
Loans sold 2005 to 2008	84,000
Subsidiaries | Government-sponsored enterprises (“GSEs”) | 2005 to 2008 Year
Loss Contingencies [Line Items]
Loans sold 2005 to 2008	11,000
Subsidiaries | Insured Securitizations | 2005 to 2008 Year
Loss Contingencies [Line Items]
Loans sold 2005 to 2008	20,000
Original principal balance, sold to third party with repurchase requests	16,000
Original principal balance, sold to third party without repurchase requests	4,000
Subsidiaries | Uninsured Securitizations | 2005 to 2008 Year
Loss Contingencies [Line Items]
Loans sold 2005 to 2008	48,000
Subsidiaries | Private Investors | 2005 to 2008 Year
Loss Contingencies [Line Items]
Loans sold 2005 to 2008	22,000
Subsidiaries | Representation and Warranty Liability [Member]
Loss Contingencies [Line Items]
Reserve liability	610	$ 731		$ 1,172
Loss Contingency Accrual, Provision	(80)	(33)
Loss Contingency, Range of Possible Loss, Portion Not Accrued	1,600	2,100
Net realized losses	(41)	(408)
Subsidiaries | Representation and Warranty Liability [Member] | Active Insured Securitizations and GSEs
Loss Contingencies [Line Items]
Reserve liability	480	499
Subsidiaries | Representation and Warranty Liability [Member] | Inactive Insured Securitizations and Others
Loss Contingencies [Line Items]
Reserve liability	$ 130	$ 232