Commitments, Contingencies, Guarantees, and Others - Schedule of Changes in Representation and Warranty Reserve (Details) - Subsidiaries - Representation and Warranty Liability [Member] - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Loss Contingency Accrual [Roll Forward]
Representation and warranty repurchase reserve, beginning of period	$ 636	$ 1,012	$ 731	$ 1,172
Provision (benefit) for mortgage representation and warranty losses	(4)	70	(58)	19
Net realized losses	0	(2)	(41)	(111)
Representation and warranty repurchase reserve, end of period	632	1,080	632	1,080
Continuing Operations
Loss Contingency Accrual [Roll Forward]
Provision (benefit) for mortgage representation and warranty losses	(7)	0	(15)	(15)
Discontinued Operations
Loss Contingency Accrual [Roll Forward]
Provision (benefit) for mortgage representation and warranty losses	$ 3	$ 70	$ (43)	$ 34