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Fair Value of Assets and Liabilities 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      
Fixed income securities $ 21,541   $ 21,400
Fair value, assets and liabilities gain (loss) included in earnings (12) $ 24  
Significant unobservable inputs (Level 3)      
Fair value of assets and liabilities measured on recurring and non-recurring basis      
Assets, fair value disclosure 325   321
Recurring basis | Significant unobservable inputs (Level 3)      
Fair value of assets and liabilities measured on recurring and non-recurring basis      
Fixed income securities 205   191
Assets, fair value disclosure 312    
Fixed Income Securities Valued Based on Nonbinding Broker Quotes | Significant unobservable inputs (Level 3)      
Fair value of assets and liabilities measured on recurring and non-recurring basis      
Assets, fair value disclosure 83   $ 80
Gain (loss) on investments      
Fair value of assets and liabilities measured on recurring and non-recurring basis      
Fair value, assets and liabilities gain (loss) included in earnings (23) 24  
Realized capital gains and losses      
Fair value of assets and liabilities measured on recurring and non-recurring basis      
Gains (losses) for Level 3 assets and liabilities still held at the balance sheet date 2 1  
Interest credited to contractholder funds      
Fair value of assets and liabilities measured on recurring and non-recurring basis      
Gains (losses) for Level 3 assets and liabilities still held at the balance sheet date (33) 19  
Contract benefits      
Fair value of assets and liabilities measured on recurring and non-recurring basis      
Gains (losses) for Level 3 assets and liabilities still held at the balance sheet date 8 $ 4  
Limited partnership interests      
Fair value of assets and liabilities measured on recurring and non-recurring basis      
Commitments to invest in limited partnership interests 258    
Assets, fair value disclosure $ 2    
Minimum | Limited partnership interests      
Fair value of assets and liabilities measured on recurring and non-recurring basis      
Investment assets, contract liquidation period 4 years    
Investment assets, useful life 10 years    
Maximum | Limited partnership interests      
Fair value of assets and liabilities measured on recurring and non-recurring basis      
Investment assets, contract liquidation period 9 years    
Investment assets, useful life 12 years