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Fair Value of Assets and Liabilities - Narrative (Details) - USD ($)
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
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 $ 27,000,000 $ 14,000,000  
Fixed income securities: 56,674,000,000   $ 58,992,000,000
Significant unobservable inputs (Level 3)      
Fair value of assets and liabilities measured on recurring and non-recurring basis      
Assets at fair value 730,000,000   840,000,000
Recurring | Significant unobservable inputs (Level 3)      
Fair value of assets and liabilities measured on recurring and non-recurring basis      
Fixed income securities: 487,000,000   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 278,000,000   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 54,000,000   $ 58,000,000
Life contract benefits      
Fair value of assets and liabilities measured on recurring and non-recurring basis      
Change in unrealized gain (loss) 4,000,000 7,000,000  
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 25,000,000 13,000,000  
Realized capital gains and losses      
Fair value of assets and liabilities measured on recurring and non-recurring basis      
Change in unrealized gain (loss) 2,000,000 1,000,000  
(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)   10,000,000  
Interest credited to contractholder funds      
Fair value of assets and liabilities measured on recurring and non-recurring basis      
Change in unrealized gain (loss) 19,000,000 $ (5,000,000)  
Limited partnership interests      
Fair value of assets and liabilities measured on recurring and non-recurring basis      
Commitments to invest in limited partnership interests $ 943,000,000    
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