v3.26.1
Reserves for Future Policy Benefits and Contract Owner Account Balances - Contract Owner Account Balances (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Policyholder Account Balance [Roll Forward]          
Beginning Balance     $ 40,374    
Interest credited $ 265 $ 260 520 $ 516  
Ending Balance 39,679   39,679   $ 40,374
Net transfers (from) to separate accounts     (372)   (884)
Retirement Deferred Group and Individual Annuity          
Policyholder Account Balance [Roll Forward]          
Beginning Balance     32,209 29,624 29,624
Deposits     1,471   3,034
Fee income     (37)   (63)
Surrenders, withdrawals and benefits     (2,821)   (5,446)
Net transfers (from) to the general account     375   690
Interest credited     444   912
Ending Balance $ 31,641   $ 31,641   $ 32,209
Weighted-average crediting rate 2.80%   2.80%   2.80%
Net amount at risk $ 58   $ 58   $ 61
Cash surrender value 31,210   31,210   31,778
Net transfers (from) to separate accounts     (747)   (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     132   266
Fee income     (175)   (362)
Surrenders, withdrawals and benefits     (186)   (410)
Net transfers (from) to the general account     3   10
Interest credited     71   158
Ending Balance $ 3,689   $ 3,689   $ 3,844
Weighted-average crediting rate 3.80%   3.80%   4.00%
Net amount at risk $ 604   $ 604   $ 629
Cash surrender value 1,014   1,014   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 2,251   2,251   2,101
Business Exited Excluded          
Policyholder Account Balance [Roll Forward]          
Beginning Balance     1,048    
Ending Balance 999   999   1,048
Other          
Policyholder Account Balance [Roll Forward]          
Beginning Balance     1,172    
Ending Balance $ 1,099   $ 1,099   $ 1,172