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Fair Value of Assets and Liabilities - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Fair value of assets and liabilities measured on recurring and non-recurring basis          
Fair value $ 58,484   $ 58,484   $ 57,170
Total realized and unrealized gains (losses) included in net income, recurring Level 3 assets and liabilities (2) $ 12 (4) $ 39  
Net investment income 10 11 36 15  
Significant unobservable inputs (Level 3)          
Fair value of assets and liabilities measured on recurring and non-recurring basis          
Assets at fair value 621   621    
Recurring | Significant unobservable inputs (Level 3)          
Fair value of assets and liabilities measured on recurring and non-recurring basis          
Fair value 286   286   325
Assets at fair value 610   610   697
Fixed Income Securities Valued Based on Nonbinding Broker Quotes          
Fair value of assets and liabilities measured on recurring and non-recurring basis          
Assets at fair value 68   68   105
Municipal Not Rated by Third Party Credit Rating Agencies          
Fair value of assets and liabilities measured on recurring and non-recurring basis          
Assets at fair value 37   37   $ 44
Gain (Loss) on Investments          
Fair value of assets and liabilities measured on recurring and non-recurring basis          
Total realized and unrealized gains (losses) included in net income, recurring Level 3 assets and liabilities (3) 14 (27) 39  
Realized capital gains (losses)          
Fair value of assets and liabilities measured on recurring and non-recurring basis          
Change in unrealized gain (loss) 4 13 8 15  
Net investment income 5 11 31 15  
Net Investment Income          
Fair value of assets and liabilities measured on recurring and non-recurring basis          
Net investment income 5   5    
Life contract benefits          
Fair value of assets and liabilities measured on recurring and non-recurring basis          
Change in unrealized gain (loss) (5) $ 1 3 5  
Interest credited to contractholder funds          
Fair value of assets and liabilities measured on recurring and non-recurring basis          
Change in unrealized gain (loss) (7)   (43) $ 19  
Limited partnership interests          
Fair value of assets and liabilities measured on recurring and non-recurring basis          
Commitments to invest in limited partnership interests $ 592   $ 592    
Limited partnership interests | Minimum          
Fair value of assets and liabilities measured on recurring and non-recurring basis          
Investment assets, useful life     10 years    
Limited partnership interests | Maximum          
Fair value of assets and liabilities measured on recurring and non-recurring basis          
Investment assets, useful life     12 years