Market Risk Benefits - Unobservable Inputs for Fair Value Measurement (Details)	Mar. 31, 2024	Dec. 31, 2023
Retirement and Income Solutions | Individual variable annuities | Minimum | Long-term interest rate
Unobservable Inputs for Fair Value Measurement
Market risk benefits, measurement input	0.0434	0.0400
Retirement and Income Solutions | Individual variable annuities | Minimum | Long-term equity market volatility
Unobservable Inputs for Fair Value Measurement
Market risk benefits, measurement input	0.1830	0.1800
Retirement and Income Solutions | Individual variable annuities | Minimum | Nonperformance risk
Unobservable Inputs for Fair Value Measurement
Market risk benefits, measurement input	0.0060	0.0080
Retirement and Income Solutions | Individual variable annuities | Minimum | Lapse rate
Unobservable Inputs for Fair Value Measurement
Market risk benefits, measurement input	0.0110	0.0110
Retirement and Income Solutions | Individual variable annuities | Maximum | Long-term interest rate
Unobservable Inputs for Fair Value Measurement
Market risk benefits, measurement input	0.0444	0.0420
Retirement and Income Solutions | Individual variable annuities | Maximum | Long-term equity market volatility
Unobservable Inputs for Fair Value Measurement
Market risk benefits, measurement input	0.3334	0.3300
Retirement and Income Solutions | Individual variable annuities | Maximum | Nonperformance risk
Unobservable Inputs for Fair Value Measurement
Market risk benefits, measurement input	0.0134	0.0160
Retirement and Income Solutions | Individual variable annuities | Maximum | Lapse rate
Unobservable Inputs for Fair Value Measurement
Market risk benefits, measurement input	0.5500	0.5500
Retirement and Income Solutions | Individual variable annuities | Weighted average input | Long-term interest rate
Unobservable Inputs for Fair Value Measurement
Market risk benefits, measurement input	0.0439	0.0410
Retirement and Income Solutions | Individual variable annuities | Weighted average input | Long-term equity market volatility
Unobservable Inputs for Fair Value Measurement
Market risk benefits, measurement input	0.2165	0.2200
Retirement and Income Solutions | Individual variable annuities | Weighted average input | Nonperformance risk
Unobservable Inputs for Fair Value Measurement
Market risk benefits, measurement input	0.0115	0.0130
Retirement and Income Solutions | Individual variable annuities | Weighted average input | Lapse rate
Unobservable Inputs for Fair Value Measurement
Market risk benefits, measurement input	0.0601	0.0590
Principal Asset Management | Principal International | Guaranteed pension | Asia | Minimum | Long-term interest rate
Unobservable Inputs for Fair Value Measurement
Market risk benefits, measurement input	0.0438	0.0454
Principal Asset Management | Principal International | Guaranteed pension | Asia | Minimum | Long-term equity market volatility
Unobservable Inputs for Fair Value Measurement
Market risk benefits, measurement input	0.1556	0.1639
Principal Asset Management | Principal International | Guaranteed pension | Asia | Minimum | Nonperformance risk
Unobservable Inputs for Fair Value Measurement
Market risk benefits, measurement input	0.0061	0.0090
Principal Asset Management | Principal International | Guaranteed pension | Asia | Minimum | Lapse rate
Unobservable Inputs for Fair Value Measurement
Market risk benefits, measurement input	0.0495	0.0495
Principal Asset Management | Principal International | Guaranteed pension | Asia | Maximum | Long-term interest rate
Unobservable Inputs for Fair Value Measurement
Market risk benefits, measurement input	0.0450	0.0470
Principal Asset Management | Principal International | Guaranteed pension | Asia | Maximum | Long-term equity market volatility
Unobservable Inputs for Fair Value Measurement
Market risk benefits, measurement input	0.2442	0.2375
Principal Asset Management | Principal International | Guaranteed pension | Asia | Maximum | Nonperformance risk
Unobservable Inputs for Fair Value Measurement
Market risk benefits, measurement input	0.0137	0.0177
Principal Asset Management | Principal International | Guaranteed pension | Asia | Maximum | Lapse rate
Unobservable Inputs for Fair Value Measurement
Market risk benefits, measurement input	0.1935	0.1935
Principal Asset Management | Principal International | Guaranteed pension | Asia | Weighted average input | Long-term interest rate
Unobservable Inputs for Fair Value Measurement
Market risk benefits, measurement input	0.0443	0.0461
Principal Asset Management | Principal International | Guaranteed pension | Asia | Weighted average input | Long-term equity market volatility
Unobservable Inputs for Fair Value Measurement
Market risk benefits, measurement input	0.1948	0.1964
Principal Asset Management | Principal International | Guaranteed pension | Asia | Weighted average input | Nonperformance risk
Unobservable Inputs for Fair Value Measurement
Market risk benefits, measurement input	0.0118	0.0151
Principal Asset Management | Principal International | Guaranteed pension | Asia | Weighted average input | Lapse rate
Unobservable Inputs for Fair Value Measurement
Market risk benefits, measurement input	0.1686	0.1680