Market Risk Benefits - Unobservable Inputs for Fair Value Measurement (Details)	Sep. 30, 2023	Dec. 31, 2022
Retirement and Income Solutions | Individual variable annuities | Minimum | Long-term interest rate
Unobservable Inputs for Fair Value Measurement
Market risk benefits, measurement input	0.0470	0.0397
Retirement and Income Solutions | Individual variable annuities | Minimum | Long-term equity market volatility
Unobservable Inputs for Fair Value Measurement
Market risk benefits, measurement input	0.1800	0.1810
Retirement and Income Solutions | Individual variable annuities | Minimum | Nonperformance risk
Unobservable Inputs for Fair Value Measurement
Market risk benefits, measurement input	0.0090	0.0090
Retirement and Income Solutions | Individual variable annuities | Minimum | Lapse rate
Unobservable Inputs for Fair Value Measurement
Market risk benefits, measurement input	0.0110	0.0125
Retirement and Income Solutions | Individual variable annuities | Maximum | Long-term interest rate
Unobservable Inputs for Fair Value Measurement
Market risk benefits, measurement input	0.0490	0.0412
Retirement and Income Solutions | Individual variable annuities | Maximum | Long-term equity market volatility
Unobservable Inputs for Fair Value Measurement
Market risk benefits, measurement input	0.3300	0.3415
Retirement and Income Solutions | Individual variable annuities | Maximum | Nonperformance risk
Unobservable Inputs for Fair Value Measurement
Market risk benefits, measurement input	0.0180	0.0196
Retirement and Income Solutions | Individual variable annuities | Maximum | Lapse rate
Unobservable Inputs for Fair Value Measurement
Market risk benefits, measurement input	0.5500	0.2475
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	0.0480	0.0404
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	0.2200	0.2207
Retirement and Income Solutions | Individual variable annuities | Weighted average input | Nonperformance risk
Unobservable Inputs for Fair Value Measurement
Market risk benefits, measurement input	0.0160	0.0165
Retirement and Income Solutions | Individual variable annuities | Weighted average input | Lapse rate
Unobservable Inputs for Fair Value Measurement
Market risk benefits, measurement input	0.0580	0.0576
Principal Asset Management | Principal International | Guaranteed pension | Asia | Minimum | Long-term interest rate
Unobservable Inputs for Fair Value Measurement
Market risk benefits, measurement input	0.0420	0.0380
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	0.1677	0.1806
Principal Asset Management | Principal International | Guaranteed pension | Asia | Minimum | Nonperformance risk
Unobservable Inputs for Fair Value Measurement
Market risk benefits, measurement input	0.0092	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	0.0437	0.0398
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	0.2424	0.2516
Principal Asset Management | Principal International | Guaranteed pension | Asia | Maximum | Nonperformance risk
Unobservable Inputs for Fair Value Measurement
Market risk benefits, measurement input	0.0192	0.0198
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	0.0428	0.0388
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	0.1970	0.2069
Principal Asset Management | Principal International | Guaranteed pension | Asia | Weighted average input | Nonperformance risk
Unobservable Inputs for Fair Value Measurement
Market risk benefits, measurement input	0.0164	0.0168
Principal Asset Management | Principal International | Guaranteed pension | Asia | Weighted average input | Lapse rate
Unobservable Inputs for Fair Value Measurement
Market risk benefits, measurement input	0.1340	0.1340