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Future Policy Benefits - Actual Experience and Expected Experience for Mortality and Lapses (Details)	Mar. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Actual experience | Traditional Life
Liability for Future Policy Benefit, Activity [Line Items]
Mortality rate	1.40%	1.50%	1.70%
Lapse rate	0.10%	0.00%	0.10%
Actual experience | Immediate Annuities
Liability for Future Policy Benefit, Activity [Line Items]
Mortality rate	3.20%	3.00%	4.20%
Lapse rate	0.00%	0.00%	0.00%
Actual experience | PRT
Liability for Future Policy Benefit, Activity [Line Items]
Mortality rate	2.70%	1.90%	0.00%
Lapse rate	0.00%	0.00%	0.00%
Expected experience | Traditional Life
Liability for Future Policy Benefit, Activity [Line Items]
Mortality rate	1.40%	1.30%	1.30%
Lapse rate	0.20%	0.30%	0.30%
Expected experience | Immediate Annuities
Liability for Future Policy Benefit, Activity [Line Items]
Mortality rate	1.70%	1.90%	2.00%
Lapse rate	0.00%	0.00%	0.00%
Expected experience | PRT
Liability for Future Policy Benefit, Activity [Line Items]
Mortality rate	2.10%	2.50%	0.00%
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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 80
-Section 50
-Paragraph 1
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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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