v3.26.1
Reserves for Future Policy Benefits and Contract Owner Account Balances - Contract Owner Account Balances (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Policyholder Account Balance [Roll Forward]      
Beginning Balance $ 40,374    
Interest credited 255 $ 256  
Ending Balance 40,238   $ 40,374
Net transfers (from) to separate accounts (139)   (884)
Retirement Deferred Group and Individual Annuity      
Policyholder Account Balance [Roll Forward]      
Beginning Balance 32,209 29,624 29,624
Deposits 758   3,034
Fee income (19)   (63)
Surrenders, withdrawals and benefits (1,372)   (5,446)
Net transfers (from) to the general account 233   690
Interest credited 221   912
Ending Balance $ 32,030   $ 32,209
Weighted-average crediting rate 2.80%   2.80%
Net amount at risk $ 61   $ 61
Cash surrender value 31,604   31,778
Net transfers (from) to separate accounts (372)   (1,574)
Retirement Deferred Group and Individual Annuity | OneAmerica      
Policyholder Account Balance [Roll Forward]      
Deferrals of commissions and expenses 0   3,458
Businesses Exited      
Policyholder Account Balance [Roll Forward]      
Beginning Balance 3,844 $ 4,182 4,182
Deposits 67   266
Fee income (86)   (362)
Surrenders, withdrawals and benefits (101)   (410)
Net transfers (from) to the general account 3   10
Interest credited 36   158
Ending Balance $ 3,763   $ 3,844
Weighted-average crediting rate 3.70%   4.00%
Net amount at risk $ 634   $ 629
Cash surrender value 1,052   1,083
Businesses Exited | OneAmerica      
Policyholder Account Balance [Roll Forward]      
Deferrals of commissions and expenses 0   0
Non-puttable funding agreement      
Policyholder Account Balance [Roll Forward]      
Beginning Balance 2,101    
Ending Balance 2,256   2,101
Business Exited Excluded      
Policyholder Account Balance [Roll Forward]      
Beginning Balance 1,048    
Ending Balance 1,036   1,048
Other      
Policyholder Account Balance [Roll Forward]      
Beginning Balance 1,172    
Ending Balance $ 1,153   $ 1,172