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Reinsurance (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Ceded Credit Risk [Line Items]      
Funds held under reinsurance agreements, liability $ 3,300 $ 3,200  
Largest recoverable from single reinsurer 4,457 4,179  
Reinsurance recoveries reported in insurance claims and policyholders' benefits reported on the Consolidated Statement of Operations 3,158 2,733 $ 2,836
Subsidiaries of Berkshire Hathaway Group      
Ceded Credit Risk [Line Items]      
Largest recoverable from single reinsurer 1,900    
Palo Verde Insurance Company      
Ceded Credit Risk [Line Items]      
Largest recoverable from single reinsurer 377    
Subsidiaries of Wilton Re      
Ceded Credit Risk [Line Items]      
Largest recoverable from single reinsurer 314    
Significant Captive Program      
Ceded Credit Risk [Line Items]      
Direct and ceded earned premiums 3,543 3,578 3,740
Reinsurance recoveries reported in insurance claims and policyholders' benefits reported on the Consolidated Statement of Operations $ 2,375 $ 2,080 $ 1,927