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Reinsurance - Narrative (Details)
$ in Millions
12 Months Ended
Dec. 31, 2021
USD ($)
item
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Reinsurance recoverable      
Number of unaffiliated reinsurers | item 13    
Reinsurance recoverable $ 6,645 $ 1,989  
Investments held by trust   1,560  
Gross life insurance in force 362,980    
Life insurance in force ceded to unaffiliated reinsurers $ 109,344 $ 63,697 $ 75,159
Maximum      
Reinsurance recoverable      
Percent of morbidity risk ceded for term-life insurance policies (as a percent) 90.00%    
A- | Reinsurer Concentration Risk | Allstate Financial | Reinsurance Recoverable Including Reinsurance Premium Paid      
Reinsurance recoverable      
Concentration risk, percentage 93.00% 94.00%  
Non-affiliate      
Reinsurance recoverable      
Life insurance in force ceded to unaffiliated reinsurers $ 109,340    
Lincoln Benefit Life Company      
Reinsurance recoverable      
Investments held by trust 6,400    
Prudential      
Reinsurance recoverable      
Reinsurance recoverable 1,090 $ 1,280  
Citigroup Subsidiaries and Scottish Re      
Reinsurance recoverable      
Reinsurance recoverable 98 99  
Scottish Re      
Reinsurance recoverable      
Reinsurance recoverable $ 62 $ 66  
Everlake Reinsurance Limited | A- | Reinsurer Concentration Risk | Allstate Financial | Reinsurance Recoverable Including Reinsurance Premium Paid      
Reinsurance recoverable      
Concentration risk, percentage 24.00%