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Market Risk Benefits - Unobservable Inputs for Fair Value Measurement (Details)	Jun. 30, 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	0.0451	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	0.0057	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	0.0460	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	0.3280	0.3300
Retirement and Income Solutions | Individual variable annuities | Maximum | Nonperformance risk
Unobservable Inputs for Fair Value Measurement
Market risk benefits, measurement input	0.0129	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	0.0455	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	0.2150	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	0.0110	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	0.0616	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		0.0454
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		0.1639
Principal Asset Management | Principal International | Guaranteed pension | Asia | Minimum | Nonperformance risk
Unobservable Inputs for Fair Value Measurement
Market risk benefits, measurement input		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
Principal Asset Management | Principal International | Guaranteed pension | Asia | Maximum | Long-term interest rate
Unobservable Inputs for Fair Value Measurement
Market risk benefits, measurement input		0.0470
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		0.2375
Principal Asset Management | Principal International | Guaranteed pension | Asia | Maximum | Nonperformance risk
Unobservable Inputs for Fair Value Measurement
Market risk benefits, measurement input		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
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		0.0461
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		0.1964
Principal Asset Management | Principal International | Guaranteed pension | Asia | Weighted average input | Nonperformance risk
Unobservable Inputs for Fair Value Measurement
Market risk benefits, measurement input		0.0151
Principal Asset Management | Principal International | Guaranteed pension | Asia | Weighted average input | Lapse rate
Unobservable Inputs for Fair Value Measurement
Market risk benefits, measurement input		0.1680

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Value of measurement input used to measure contract or contract feature in long-duration contract issued by insurance entity that both protects contract holder from other-than-nominal capital market risk and exposes insurance entity to other-than-nominal capital market risk.

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