Policyholder Account Balances - Amounts on Balance Sheet (Details) - USD ($) $ in Millions |
Mar. 31, 2026 |
Dec. 31, 2025 |
Mar. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|---|---|
| Policyholder Account Balance [Line Items] | ||||
| Policyholder account balance | $ 104,711 | $ 104,091 | ||
| Group Life | ||||
| Policyholder Account Balance [Line Items] | ||||
| Policyholder account balance | 10,265 | 10,197 | $ 10,492 | |
| Capital Markets Investment Products and Stable Value GICs | ||||
| Policyholder Account Balance [Line Items] | ||||
| Policyholder account balance | 60,117 | 59,278 | 58,652 | $ 57,799 |
| Annuities and Risk Solutions | ||||
| Policyholder Account Balance [Line Items] | ||||
| Policyholder account balance | 15,764 | 15,671 | 14,876 | |
| Fixed Annuity | ||||
| Policyholder Account Balance [Line Items] | ||||
| Policyholder account balance | 5,607 | 5,788 | $ 6,187 | |
| Other Products | ||||
| Policyholder Account Balance [Line Items] | ||||
| Policyholder account balance | $ 12,958 | $ 13,157 |