v3.26.3
Contractholder Funds - Changes in Policyholder Account Balances, Retirement and Income Solutions (Details) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2026
Dec. 31, 2025
Changes in policyholder account balances    
Policyholder account balance, beginning of period $ 30,318.1  
Policyholder account balance, end of period 32,959.0 $ 30,318.1
Retirement and Income Solutions    
Changes in policyholder account balances    
Policyholder account balance, beginning of period 23,809.1  
Policyholder account balance, end of period 26,696.5 23,809.1
Retirement and Income Solutions | Workplace savings and retirement solutions    
Changes in policyholder account balances    
Policyholder account balance, beginning of period 15,808.1 13,982.8
Premiums and deposits 4,656.8 5,734.4
Policy charges (25.9) (36.7)
Surrenders, withdrawals and benefit payments (2,658.7) (4,206.8)
Net transfers from (to) separate account (987.5) (162.1)
Interest credited 481.3 522.5
Other (25.6) (26.0)
Policyholder account balance, end of period $ 17,248.5 $ 15,808.1
Weighted-average crediting rate 4.05% 3.87%
Cash surrender value $ 15,660.2 $ 14,606.4
Retirement and Income Solutions | Individual variable annuities    
Changes in policyholder account balances    
Policyholder account balance, beginning of period 4,273.0 1,906.7
Premiums and deposits 1,404.5 2,296.3
Surrenders, withdrawals and benefit payments (1,268.7) (1,927.4)
Net transfers from (to) separate account 1,053.7 1,653.9
Interest credited 99.3 82.7
Change in fair value of embedded derivative 658.4 236.6
Other 12.7 24.2
Policyholder account balance, end of period $ 6,232.9 $ 4,273.0
Weighted-average crediting rate 3.29% 3.37%
Cash surrender value $ 5,733.3 $ 4,123.4
Retirement and Income Solutions | Individual fixed deferred annuities    
Changes in policyholder account balances    
Policyholder account balance, beginning of period 3,728.0 4,460.7
Premiums and deposits 21.7 24.8
Surrenders, withdrawals and benefit payments (609.7) (878.5)
Interest credited 74.0 121.9
Change in fair value of embedded derivative 5.8 5.9
Other (4.7) (6.8)
Policyholder account balance, end of period $ 3,215.1 $ 3,728.0
Weighted-average crediting rate 3.18% 3.16%
Cash surrender value $ 3,048.4 $ 3,525.6