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Consolidated Variable Interest Entities - Narrative (Details)
3 Months Ended
Mar. 31, 2018
USD ($)
Entity
Mar. 31, 2017
USD ($)
Entity
Dec. 31, 2017
USD ($)
Entity
Dec. 31, 2016
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      
Reclassification adjustment for gains (losses) included in net income (loss), net of tax (2,000,000) $ 0    
Credit Risk Derivatives at Fair Value before Effect of Credit Spread Net 1 [Abstract]        
Fair value gains (losses) on FG VIEs 4,000,000 10,000,000    
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 $ 4,000,000 $ 10,000,000    
Number of VIE that did not require consolidation | Entity 31 32 32 32
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 522   510  
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 $ 92,000,000   $ 99,000,000  
Fair Value, Option, Loans Held as Assets, Aggregate Difference 357,000,000      
Difference between the aggregate unpaid principal and aggregate fair value of the VIEs' Assets     361,000,000  
Change in the instrument specific credit risk of the VIEs' assets 2,000,000 $ 14,000,000    
Unpaid principal for FG VIEs’ liabilities with recourse 644,000,000   674,000,000  
Fair Value, Option, Loans Held as Liabilities, Aggregate Difference 71,000,000      
Unpaid principal for FG VIEs' liabilities with and without recourse     $ 73,000,000  
Change in fair value of FG VIE liabilities with recourse 5,000,000      
Accounting Standards Update 2016-01 [Member]        
Variable Interest Entity [Line Items]        
Reclassification adjustment for gains (losses) included in net income (loss), net of tax $ 33,000,000