Separate Account Balances - Separate Account Liabilities (Details) - USD ($) $ in Millions |
Jun. 30, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|---|---|---|---|
| Separate Account Balances | |||
| Separate account liabilities | $ 180,728.0 | $ 173,327.1 | |
| Other balances | |||
| Separate Account Balances | |||
| Separate account liabilities | 299.5 | 280.2 | |
| Retirement and Income Solutions | |||
| Separate Account Balances | |||
| Separate account liabilities | 136,140.3 | 133,438.0 | |
| Retirement and Income Solutions | Group retirement contracts | |||
| Separate Account Balances | |||
| Separate account liabilities | 128,432.7 | 125,103.1 | $ 117,518.5 |
| Retirement and Income Solutions | Individual variable annuities | |||
| Separate Account Balances | |||
| Separate account liabilities | 7,707.6 | 8,334.9 | 9,131.9 |
| Principal Asset Management | International Pension | Pension | Latin America | |||
| Separate Account Balances | |||
| Separate account liabilities | 36,950.3 | 32,802.2 | 34,580.6 |
| Benefits and Protection | Life Insurance | Universal life | |||
| Separate Account Balances | |||
| Separate account liabilities | $ 7,337.9 | $ 6,806.7 | $ 5,982.5 |