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Future Policy Benefits - Actual Experience and Expected Experience for Mortality and Lapses (Details)	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Actual experience | Traditional life
Liability for Future Policy Benefit, Activity [Line Items]
Mortality rate	1.40%	1.70%	1.50%
Lapse rate	0.10%	0.00%	0.00%
Actual experience | Immediate annuities
Liability for Future Policy Benefit, Activity [Line Items]
Mortality rate	2.70%	3.20%	3.00%
Lapse rate	0.00%	0.00%	0.00%
Actual experience | PRT
Liability for Future Policy Benefit, Activity [Line Items]
Mortality rate	2.70%	3.20%	1.90%
Lapse rate	0.00%	0.00%	0.00%
Expected experience | Traditional life
Liability for Future Policy Benefit, Activity [Line Items]
Mortality rate	1.50%	1.40%	1.30%
Lapse rate	0.50%	0.30%	0.30%
Expected experience | Immediate annuities
Liability for Future Policy Benefit, Activity [Line Items]
Mortality rate	1.90%	1.80%	1.90%
Lapse rate	0.00%	0.00%	0.00%
Expected experience | PRT
Liability for Future Policy Benefit, Activity [Line Items]
Mortality rate	2.50%	2.30%	2.50%
Lapse rate	0.00%	0.00%	0.00%

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Anticipated rate of future terminations of contracts in force as of the balance sheet date, which is included in determining the amount of the specified guaranteed benefit obligation as of the balance sheet date.

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Actuarially determined death rate of policyholders, which is included in determining the amount of the specified guaranteed benefit obligation as of the balance sheet date.

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