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Fair Value of Assets and Liabilities - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Fair value of assets and liabilities measured on recurring and non-recurring basis          
Fair value $ 57,663,000,000   $ 57,663,000,000   $ 58,992,000,000
Total realized and unrealized gains (losses) included in net income, recurring Level 3 assets and liabilities (2,000,000) $ 6,000,000 (41,000,000) $ (17,000,000)  
Significant unobservable inputs (Level 3)          
Fair value of assets and liabilities measured on recurring and non-recurring basis          
Assets at fair value 796,000,000   796,000,000   840,000,000
Recurring | Significant unobservable inputs (Level 3)          
Fair value of assets and liabilities measured on recurring and non-recurring basis          
Fair value 455,000,000   455,000,000   606,000,000
Assets at fair value         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 199,000,000   199,000,000   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 48,000,000   48,000,000   $ 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 1,000,000 9,000,000 (40,000,000) (7,000,000)  
Realized capital gains and losses          
Fair value of assets and liabilities measured on recurring and non-recurring basis          
Change in unrealized gain (loss) 8,000,000 (3,000,000) 23,000,000 (3,000,000)  
Life contract benefits          
Fair value of assets and liabilities measured on recurring and non-recurring basis          
Change in unrealized gain (loss) 2,000,000 (4,000,000) 7,000,000 4,000,000  
(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)   3,000,000   17,000,000  
Interest credited to contractholder funds          
Fair value of assets and liabilities measured on recurring and non-recurring basis          
Change in unrealized gain (loss) (9,000,000) $ (5,000,000) 10,000,000 $ (11,000,000)  
Limited partnership interests          
Fair value of assets and liabilities measured on recurring and non-recurring basis          
Commitments to invest in limited partnership interests $ 775,000,000   $ 775,000,000    
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