Long-Duration Insurance Contracts - Actual and Expected Experience of Mortality Rate and Lapse Rate (Details)	Dec. 31, 2023	Dec. 31, 2022
Whole Life
Liability for Future Policy Benefit, by Product Segment [Line Items]
Mortality, actual experience	0.70%	0.70%
Mortality, expected experience	0.70%	0.70%
Lapse rate, actual experience	3.40%	3.20%
Lapse rate, expected experience	4.80%	5.90%
Experience life
Liability for Future Policy Benefit, by Product Segment [Line Items]
Mortality, actual experience	1.60%	1.60%
Mortality, expected experience	1.60%	1.40%
Lapse rate, actual experience	3.20%	3.30%
Lapse rate, expected experience	3.10%	3.20%
Limited-pay whole life
Liability for Future Policy Benefit, by Product Segment [Line Items]
Mortality, actual experience	0.20%	0.30%
Mortality, expected experience	0.30%	0.20%
Lapse rate, actual experience	4.20%	3.80%
Lapse rate, expected experience	5.40%	7.60%
Term Life | Maximum
Liability for Future Policy Benefit, by Product Segment [Line Items]
Mortality, actual experience	0.70%	0.30%
Mortality, expected experience	2.30%	1.00%
Lapse rate, actual experience	13.00%	58.10%
Lapse rate, expected experience	36.80%	9.80%
Term Life | Minimum
Liability for Future Policy Benefit, by Product Segment [Line Items]
Mortality, actual experience	0.10%	0.10%
Mortality, expected experience	0.10%	0.10%
Lapse rate, actual experience	5.30%	5.70%
Lapse rate, expected experience	5.80%	6.60%