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Fair Value of Assets and Liabilities - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Fair value of assets and liabilities measured on recurring and non-recurring basis          
Total recurring Level 3 assets $ 3 $ 3 $ 9 $ 10  
Fair value 22,000   22,000   $ 21,400
Level 3          
Fair value of assets and liabilities measured on recurring and non-recurring basis          
Securities valued based on non-binding broker quotes 338   338   321
Fixed income securities | Level 3          
Fair value of assets and liabilities measured on recurring and non-recurring basis          
Securities valued based on non-binding broker quotes 75   75   80
Recurring basis | Level 3          
Fair value of assets and liabilities measured on recurring and non-recurring basis          
Fair value 214   214   $ 191
Securities valued based on non-binding broker quotes 338   338    
Limited partnership interests          
Fair value of assets and liabilities measured on recurring and non-recurring basis          
Commitments to invest in limited partnership interests $ 221   $ 221    
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, typical contractual 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, typical contractual life     12 years