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Fair Value of Assets and Liabilities - Narrative (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Fair value of assets and liabilities measured on recurring and non-recurring basis    
Fixed income securities, at fair value $ 42,825 $ 42,565
Assets at fair value 83,523 82,413
Significant unobservable inputs (Level 3)    
Fair value of assets and liabilities measured on recurring and non-recurring basis    
Assets at fair value 769 832
Recurring basis    
Fair value of assets and liabilities measured on recurring and non-recurring basis    
Fixed income securities, at fair value 42,825 42,565
Assets at fair value 83,481 82,413
Recurring basis | Significant unobservable inputs (Level 3)    
Fair value of assets and liabilities measured on recurring and non-recurring basis    
Fixed income securities, at fair value 155 226
Assets at fair value 727 832
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 43 69
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 16 $ 18
Limited partnership interests    
Fair value of assets and liabilities measured on recurring and non-recurring basis    
Commitments to invest in limited partnership interests $ 268  
Limited partnership interests | Minimum    
Fair value of assets and liabilities measured on recurring and non-recurring basis    
Investment assets, useful life (in years) 10 years  
Limited partnership interests | Maximum    
Fair value of assets and liabilities measured on recurring and non-recurring basis    
Investment assets, useful life (in years) 12 years