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Managed Investment Entities - Narrative (Details)
$ in Millions
1 Months Ended 6 Months Ended
Mar. 31, 2018
USD ($)
collateralizedloanobligation
Jun. 30, 2019
USD ($)
collateralizedloanobligation
Jun. 30, 2018
USD ($)
collateralizedloanobligation
Dec. 31, 2018
USD ($)
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   11    
Number of collateralized loan obligation entities formed during the period | collateralizedloanobligation 1      
Proceeds received by subsidiaries related to sales and redemptions of managed investment entities liabilities     $ 45  
Number of collateralized loan obligation entities substantially liquidated, during the period | collateralizedloanobligation     1  
Difference between aggregate unpaid principal balance and fair value of CLOs' fixed maturity investments   $ 145   $ 232
Difference between aggregate unpaid principal balance and carrying value of CLOs' debt   150   241
Carrying amount of CLO loans in default   7    
Aggregate unpaid principal balance of variable interest entity loans in default   15   0
Available for sale (AFS) fixed maturities   44,710   41,997
Variable interest entity, primary beneficiary        
Variable Interest Entity [Line Items]        
Aggregate fair value of investment in collateralized loan obligations   191 $ 192 188
New Collateralized Loan Obligation Entities        
Variable Interest Entity [Line Items]        
Face value of liabilities issued by managed investment entities on issuance date $ 463      
Face amount of managed investment entities liabilities purchased by subsidiaries at issuance date $ 31      
Subordinated Debt Obligations | Variable interest entity, primary beneficiary        
Variable Interest Entity [Line Items]        
Aggregate fair value of investment in collateralized loan obligations   128    
Maximum        
Variable Interest Entity [Line Items]        
Proceeds received by subsidiaries related to sales and redemptions of managed investment entities liabilities   1    
Collateralized loan obligations        
Variable Interest Entity [Line Items]        
Available for sale (AFS) fixed maturities   4,333   4,278
Collateralized loan obligations | Managed by third parties        
Variable Interest Entity [Line Items]        
Available for sale (AFS) fixed maturities   $ 4,330   $ 4,280