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Fair Value of Assets and Liabilities - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Fair value of assets and liabilities measured on recurring and non-recurring basis          
Fair value $ 56,891,000,000   $ 56,891,000,000   $ 58,992,000,000
Total realized and unrealized gains (losses) included in net income, recurring Level 3 assets and liabilities 12,000,000 $ 9,000,000 39,000,000 $ 23,000,000  
Significant unobservable inputs (Level 3)          
Fair value of assets and liabilities measured on recurring and non-recurring basis          
Assets at fair value 785,000,000   785,000,000   840,000,000
Recurring | Significant unobservable inputs (Level 3)          
Fair value of assets and liabilities measured on recurring and non-recurring basis          
Fair value 485,000,000   485,000,000   606,000,000
Assets at fair value 777,000,000   777,000,000   837,000,000
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 251,000,000   251,000,000   271,000,000
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 57,000,000   57,000,000   $ 58,000,000
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 14,000,000 3,000,000 39,000,000 16,000,000  
Realized capital gains and losses          
Fair value of assets and liabilities measured on recurring and non-recurring basis          
Change in unrealized gain (loss) 13,000,000 (1,000,000) 15,000,000    
Interest credited to contractholder funds          
Fair value of assets and liabilities measured on recurring and non-recurring basis          
Change in unrealized gain (loss)   (1,000,000) 19,000,000 (6,000,000)  
Life contract benefits          
Fair value of assets and liabilities measured on recurring and non-recurring basis          
Change in unrealized gain (loss) 1,000,000 1,000,000 5,000,000 8,000,000  
(Loss) gain reclassified from AOCI into income (net investment income)          
Fair value of assets and liabilities measured on recurring and non-recurring basis          
Change in unrealized gain (loss)   $ 4,000,000   $ 14,000,000  
Limited partnership interests          
Fair value of assets and liabilities measured on recurring and non-recurring basis          
Commitments to invest in limited partnership interests $ 866,000,000   $ 866,000,000    
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