Consolidated Variable Interest Entities - Narrative (Details)	3 Months Ended			6 Months Ended
	Jun. 30, 2015 USD ($) Entity	Jun. 30, 2014 USD ($) Entity	Mar. 31, 2014 Entity	Jun. 30, 2015 USD ($) Entity	Jun. 30, 2014 USD ($) Entity	Dec. 31, 2014 USD ($) Entity	Dec. 31, 2013 Entity
Variable Interest Entity [Line Items]
Net fair value gains and losses on FG VIEs are expected to reverse to zero at maturity of the VIE debt	$ 0			$ 0
Credit Risk Derivatives at Fair Value before Effect of Credit Spread Net 1 [Abstract]
Fair value gains (losses) on FG VIEs	5,000,000	$ 25,000,000		(2,000,000)	$ 182,000,000
Number of entities to be deconsolidated | Entity			7
Number of FG VIE's matured | Entity					(2)
Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Net loss on consolidation				26,000,000
Net gain on deconsolidation					$ 120,000,000
Credit Risk Derivatives at Fair Value before Effect of Credit Spread Net 1 [Abstract]
Fair value gains (losses) on FG VIEs	$ 5,000,000	$ 25,000,000		$ (2,000,000)	182,000,000
Gain from Company's exercise of options					$ 37,000,000
Number of FG VIE's matured | Entity				0	(2)
Number of VIE that did not require consolidation | Entity	37	31		37	31	32	40
Variable Interest Entity, Not Primary Beneficiary, Aggregated Disclosure [Member]
Credit Risk Derivatives at Fair Value before Effect of Credit Spread Net 1 [Abstract]
Number of VIE that did not require consolidation | Entity	935			935		930
Residential Mortgage Backed Securities and Other Insurance Products [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Credit Risk Derivatives at Fair Value before Effect of Credit Spread Net 1 [Abstract]
Total unpaid principal balance for the VIEs' assets that were over 90 days or more past due	$ 216,000,000			$ 216,000,000		$ 183,000,000
Difference between the aggregate unpaid principal and aggregate fair value of the VIEs' Assets	924,000,000			924,000,000		941,000,000
Change in the instrument specific credit risk of the VIEs' assets	50,000,000	$ 30,000,000		32,000,000	$ 54,000,000
Unpaid principal for FG VIEs’ liabilities with recourse	2,096,000,000			2,096,000,000		1,912,000,000
Unpaid principal for FG VIEs' liabilities with and without recourse	$ 986,000,000			$ 986,000,000		$ 916,000,000