Commitments, Contingencies, Guarantees, and Others - Schedule of Changes in Representation and Warranty Reserve (Details) - Subsidiaries - Representation and Warranty Liability [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Loss Contingency Accrual [Roll Forward]
Representation and warranty repurchase reserve, beginning of period	$ 610	$ 731	$ 1,172
Provision (benefit) for mortgage representation and warranty losses	19	(80)	(33)
Net realized losses	1	(41)	(408)
Representation and warranty repurchase reserve, end of period	630	610	731
Continuing Operations
Loss Contingency Accrual [Roll Forward]
Provision (benefit) for mortgage representation and warranty losses	(2)	(16)	(26)
Discontinued Operations
Loss Contingency Accrual [Roll Forward]
Provision (benefit) for mortgage representation and warranty losses	$ 21	$ (64)	$ (7)