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Fair Value of Assets and Liabilities - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Fair value of assets and liabilities measured on recurring and non-recurring basis      
Fair value $ 58,202   $ 57,170
Total realized and unrealized gains (losses) included in net income, recurring Level 3 assets and liabilities 2 $ (27)  
Significant unobservable inputs (Level 3)      
Fair value of assets and liabilities measured on recurring and non-recurring basis      
Assets at fair value 753    
Recurring | Significant unobservable inputs (Level 3)      
Fair value of assets and liabilities measured on recurring and non-recurring basis      
Fair value 370   325
Assets at fair value 714   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 127   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 41   $ 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 (24) (25)  
Realized capital gains (losses)      
Fair value of assets and liabilities measured on recurring and non-recurring basis      
Change in unrealized gain (loss) 4 2  
Life contract benefits      
Fair value of assets and liabilities measured on recurring and non-recurring basis      
Change in unrealized gain (loss) 8 4  
Interest credited to contractholder funds      
Fair value of assets and liabilities measured on recurring and non-recurring basis      
Change in unrealized gain (loss) (36) $ 19  
Limited partnership interests      
Fair value of assets and liabilities measured on recurring and non-recurring basis      
Commitments to invest in limited partnership interests $ 635    
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