Commitments, Contingencies, Guarantees, and Others - Schedule of Open Claims in Pipeline (Details) (Subsidiaries, USD $) In Millions, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
Unresolved Repurchase Claims [Roll Forward]
Open claims, beginning balance	$ 2,825	$ 2,419
Gross new demands received	760	634
Loans repurchased/made whole	(31)	(81)
Demands rescinded	(818)	(147)
Open claims, ending balance	2,736	2,825
Government-sponsored enterprises (“GSEs”)
Unresolved Repurchase Claims [Roll Forward]
Open claims, beginning balance	89	59
Gross new demands received	19	203
Loans repurchased/made whole	(28)	(49)
Demands rescinded	(61)	(124)
Open claims, ending balance	19	89
Insured Securitizations
Unresolved Repurchase Claims [Roll Forward]
Open claims, beginning balance	1,614	1,579
Gross new demands received	1	40
Loans repurchased/made whole	0	(5)
Demands rescinded	(745)	0
Open claims, ending balance	870	1,614
Uninsured Securitizations and Other
Unresolved Repurchase Claims [Roll Forward]
Open claims, beginning balance	1,122	781
Gross new demands received	740	391
Loans repurchased/made whole	(3)	(27)
Demands rescinded	(12)	(23)
Open claims, ending balance	$ 1,847	$ 1,122