Commitments, Contingencies, Guarantees, and Others - Schedule of Open Claims in Pipeline (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Loss Contingencies [Line Items]
Increase (Decrease) In Unresolved Repurchase Claims Face Amount	$ 1,200
Subsidiaries
Unresolved Repurchase Claims [Roll Forward]
Open claims, beginning balance	2,512	$ 2,825
Gross new demands received	46	764
Loans repurchased/made whole	(18)	(36)
Demands rescinded	(1,190)	(1,041)
Open claims, ending balance	1,350	2,512
Subsidiaries | Government-sponsored enterprises (“GSEs”)
Unresolved Repurchase Claims [Roll Forward]
Open claims, beginning balance	16	89
Gross new demands received	23	22
Loans repurchased/made whole	(17)	(31)
Demands rescinded	(21)	(64)
Open claims, ending balance	1	16
Subsidiaries | Insured Securitizations
Unresolved Repurchase Claims [Roll Forward]
Open claims, beginning balance	649	1,614
Gross new demands received	0	0
Loans repurchased/made whole	0	0
Demands rescinded	(115)	(965)
Open claims, ending balance	534	649
Subsidiaries | Uninsured Securitizations and Other
Unresolved Repurchase Claims [Roll Forward]
Open claims, beginning balance	1,847	1,122
Gross new demands received	23	742
Loans repurchased/made whole	(1)	(5)
Demands rescinded	(1,054)	(12)
Open claims, ending balance	$ 815	$ 1,847