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Fair Value of Assets and Liabilities - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Fair value of assets and liabilities measured on recurring and non-recurring basis    
Commitments to invest in limited partnership interests $ 918 $ 1,063
Fair value 23,907 21,725
Significant unobservable inputs (Level 3)    
Fair value of assets and liabilities measured on recurring and non-recurring basis    
Fair value 153 208
Assets at fair value 267 324
Limited partnership interests    
Fair value of assets and liabilities measured on recurring and non-recurring basis    
Commitments to invest in limited partnership interests 166  
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 at fair value $ 24 $ 38
Minimum | Limited partnership interests    
Fair value of assets and liabilities measured on recurring and non-recurring basis    
Distribution and proceed period (in years) 4 years  
Useful life (in years) 10 years  
Maximum | Limited partnership interests    
Fair value of assets and liabilities measured on recurring and non-recurring basis    
Distribution and proceed period (in years) 9 years  
Useful life (in years) 12 years