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Managed Investment Entities - Narrative (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2017
USD ($)
collateralizedloanobligation
Dec. 31, 2016
USD ($)
collateralizedloanobligation
Dec. 31, 2015
USD ($)
collateralizedloanobligation
Variable Interest Entity [Line Items]      
Percentage of investment of most subordinate debt tranche, Minimum 15.00%    
Percentage of investment of most subordinate debt tranche, Maximum 60.90%    
Number of collateralized loan obligation entities | collateralizedloanobligation 15    
Number of collateralized loan obligation entities formed during the period | collateralizedloanobligation 2 2 2
Face amount of managed investment entities liabilities purchased by subsidiaries after issuance date $ 71 $ 24  
Amount paid by subsidiaries to purchase managed investment entities liabilities after issuance date 71 17  
Proceeds received by subsidiaries related to sales and redemptions of managed investment entities liabilities $ 103 115  
Number of collateralized loan obligation entities that were substantially liquidated during the period | collateralizedloanobligation 2    
Difference between aggregate unpaid principal balance and fair value of CLOs' fixed maturity investments $ 55 75  
Difference between aggregate unpaid principal balance and fair value of CLOs' debt 118 159  
Carrying amount of CLO loans in default 1 1  
Aggregate unpaid principal balance of CLO loans in default 8 10  
Variable interest entity, primary beneficiary      
Variable Interest Entity [Line Items]      
Aggregate fair value of investment in collateralized loan obligations 215 216 $ 266
New collateralized loan obligation entities      
Variable Interest Entity [Line Items]      
Face value of liabilities issued by managed investment entities on issuance date 865 866 869
Face amount of managed investment entities liabilities purchased by subsidiaries at issuance date 48 $ 64 $ 81
Subordinated debt obligations | Variable interest entity, primary beneficiary      
Variable Interest Entity [Line Items]      
Aggregate fair value of investment in collateralized loan obligations $ 130