Commitments, Contingencies, Guarantees, and Others - Schedule of Changes in Representation and Warranty Reserve (Details) (Subsidiaries, Representation and Warranty Liability, USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Loss Contingency Accrual [Roll Forward]
Representation and warranty repurchase reserve, beginning of period	$ 1,172	$ 899
Provision (benefit) for mortgage representation and warranty losses	(33)	309
Net realized losses	(408)	(36)
Representation and warranty repurchase reserve, end of period	731	1,172
Continuing Operations
Loss Contingency Accrual [Roll Forward]
Provision (benefit) for mortgage representation and warranty losses	(26)	(24)
Discontinued Operations
Loss Contingency Accrual [Roll Forward]
Provision (benefit) for mortgage representation and warranty losses	$ (7)	$ 333