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Fair Value of Assets and Liabilities - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Fair value of assets and liabilities measured on recurring and non-recurring basis    
Fixed income securities $ 59,044 $ 57,170
Commitments to invest in limited partnership interests 2,837 3,028
Limited partnership interests    
Fair value of assets and liabilities measured on recurring and non-recurring basis    
Commitments to invest in limited partnership interests $ 492  
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  
Fixed Income Securities Valued Based on Nonbinding Broker Quotes    
Fair value of assets and liabilities measured on recurring and non-recurring basis    
Total assets at fair value $ 50 105
Municipal Not Rated by Third Party Credit Rating Agencies    
Fair value of assets and liabilities measured on recurring and non-recurring basis    
Total assets at fair value 36 44
Significant unobservable inputs (Level 3)    
Fair value of assets and liabilities measured on recurring and non-recurring basis    
Total assets at fair value 738  
Significant unobservable inputs (Level 3) | Recurring    
Fair value of assets and liabilities measured on recurring and non-recurring basis    
Embedded Derivative, Fair Value of Embedded Derivative Liability 462 224
Fixed income securities $ 342 325
Total assets at fair value   $ 697