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Separate Account Balances - Separate Account Liabilities (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022 | Dec. 31, 2021
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Separate Account Balances |  |  |
Separate account liabilities | $ 155,478.2 | $ 155,375.1 |
Other balances |  |  |
Separate Account Balances |  |  |
Separate account liabilities | 237.3 | 233.3 |
Retirement and Income Solutions |  |  |
Separate Account Balances |  |  |
Separate account liabilities | 117,251.7 | 115,899.1 |
Retirement and Income Solutions | Group retirement contracts |  |  |
Separate Account Balances |  |  |
Separate account liabilities | 108,677.4 | 107,240.1 | $ 131,188.6
Retirement and Income Solutions | Individual variable annuities |  |  |
Separate Account Balances |  |  |
Separate account liabilities | 8,574.3 | 8,659.0 | 11,000.0
Principal Asset Management | Principal International |  |  |
Separate Account Balances |  |  |
Separate account liabilities | 32,572.9 | 34,231.7 |
Principal Asset Management | Principal International | Pension | Latin America |  |  |
Separate Account Balances |  |  |
Separate account liabilities | 31,680.8 | 33,316.7 | 33,030.6
Principal Asset Management | Principal International | Guaranteed pension | Asia |  |  |
Separate Account Balances |  |  |
Separate account liabilities | 892.1 | 915.0 | 971.3
Benefits and Protection | Life Insurance | Universal life |  |  |
Separate Account Balances |  |  |
Separate account liabilities | $ 5,416.3 | $ 5,011.0 | $ 5,886.1

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