Consolidated Variable Interest Entities - Narrative (Details)	3 Months Ended
	Mar. 31, 2017 USD ($) Entity	Mar. 31, 2016 USD ($) Entity	Dec. 31, 2016 USD ($) Entity	Dec. 31, 2015 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
Credit Risk Derivatives at Fair Value before Effect of Credit Spread Net 1 [Abstract]
Fair value gains (losses) on FG VIEs	10,000,000	$ 18,000,000
Variable Interest Entity, Primary Beneficiary [Member]
Credit Risk Derivatives at Fair Value before Effect of Credit Spread Net 1 [Abstract]
Fair value gains (losses) on FG VIEs	$ 10,000,000	$ 18,000,000
Number of VIE that did not require consolidation | Entity	32	33	32	34
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	590		600
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	$ 119,000,000		$ 137,000,000
Difference between the aggregate unpaid principal and aggregate fair value of the VIEs' Assets	396,000,000		432,000,000
Change in the instrument specific credit risk of the VIEs' assets	14,000,000	$ 34,000,000
Unpaid principal for FG VIEs’ liabilities with recourse	775,000,000		871,000,000
Unpaid principal for FG VIEs' liabilities with and without recourse	$ 84,000,000		$ 109,000,000