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Claim and Claim Adjustment Expense Reserves (Narrative) (Details) - USD ($)
 3 Months Ended 9 Months Ended 13 Months Ended
Feb. 05, 2021
Sep. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Feb. 05, 2021
Dec. 31, 2020
Dec. 31, 2010
Liability for Claims and Claims Adjustment Expense [Line Items]                  
Unusual or infrequent item, or both, net of insurance proceeds   $ 178,000,000   $ 160,000,000 $ 357,000,000 $ 536,000,000      
Retroactive reinsurance benefit recognized   8,000,000   9,000,000 30,000,000 43,000,000      
Funds held under reinsurance agreements, liability $ 690,000,000 $ 690,000,000     $ 690,000,000   $ 690,000,000    
Retroactive resinurance agreement, maximum 1,000,000,000           1,000,000,000    
Reinsurance premiums paid $ 697,000,000           $ 64,000,000    
Reinsurance, loss on uncollectible accounts in period, amount     $ 12,000,000            
Collateral trust account, percentage of outstanding reserves   105.00%     105.00%        
Liability for unpaid claims and claims adjustment expense structured settlement obligations period increase (decrease)   $ 2,000,000   46,000,000          
Liability for unpaid claims and claims adjustment expense, long term care policies, period increase (decrease)   40,000,000   37,000,000          
Premium deficiency and future policy benefit   72,000,000   74,000,000 $ 72,000,000 74,000,000      
Corporate & Other                  
Liability for Claims and Claims Adjustment Expense [Line Items]                  
Total pretax (favorable) unfavorable development         40,000,000 50,000,000      
International                  
Liability for Claims and Claims Adjustment Expense [Line Items]                  
Total pretax (favorable) unfavorable development   3,000,000   $ 0 2,000,000 (3,000,000)      
Hurricane Ida                  
Liability for Claims and Claims Adjustment Expense [Line Items]                  
Unusual or infrequent item, or both, net of insurance proceeds   114,000,000              
Weather Related Events                  
Liability for Claims and Claims Adjustment Expense [Line Items]                  
Unusual or infrequent item, or both, net of insurance proceeds           273,000,000      
COVID-19                  
Liability for Claims and Claims Adjustment Expense [Line Items]                  
Unusual or infrequent item, or both, net of insurance proceeds           195,000,000      
Civil Unrest                  
Liability for Claims and Claims Adjustment Expense [Line Items]                  
Unusual or infrequent item, or both, net of insurance proceeds           $ 68,000,000      
Asbestos and Environmental Reserves                  
Liability for Claims and Claims Adjustment Expense [Line Items]                  
Net A&EP claim and allocated claim adjustment expense reserves ceded to NICO                 $ 1,600,000,000
Aggregate limit under A&EP Loss Portfolio Transfer                 4,000,000,000
A&EP claim and allocated claim adjustment expense reserves ceded under existing third party reinsurance contracts transferred to NICO under A&EP Loss Portfolio Transfer                 1,200,000,000
Reinsurance premium paid to NICO under A&EP Loss Portfolio Transfer                 2,000,000,000
Net reinsurance receivables transferred to NICO under A&EP Loss Portfolio Transfer                 215,000,000
Total consideration paid to NICO under AEP Loss Portfolio Transfer                 $ 2,200,000,000
Cumulative amounts ceded under AEP Loss Portfolio Transfer   3,300,000,000     3,300,000,000     $ 3,300,000,000  
Deferred reinsurance benefit yet to be recognized   368,000,000     368,000,000     $ 398,000,000  
Fair value of collateral trust account established by NICO under A&EP Loss Portfolio Transfer   $ 2,900,000,000     $ 2,900,000,000