Long-Duration Insurance Contracts - Actual and Expected Experience of Mortality Rate and Lapse Rate (Details)	Dec. 31, 2024	Dec. 31, 2023
Whole Life
Liability for Future Policy Benefit, by Product Segment [Line Items]
Mortality, actual experience	0.70%	0.70%
Mortality, expected experience	0.80%	0.70%
Lapse rate, actual experience	3.00%	3.40%
Lapse rate, expected experience	4.50%	4.80%
Term Life | Maximum
Liability for Future Policy Benefit, by Product Segment [Line Items]
Mortality, actual experience	0.50%	0.70%
Mortality, expected experience	1.70%	2.30%
Lapse rate, actual experience	38.20%	13.00%
Lapse rate, expected experience	21.90%	36.80%
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	3.90%	5.30%
Lapse rate, expected experience	5.60%	5.80%
Experience life
Liability for Future Policy Benefit, by Product Segment [Line Items]
Mortality, actual experience	1.80%	1.60%
Mortality, expected experience	1.70%	1.60%
Lapse rate, actual experience	2.90%	3.20%
Lapse rate, expected experience	3.10%	3.10%
Limited-Pay Whole Life
Liability for Future Policy Benefit, by Product Segment [Line Items]
Mortality, actual experience	0.10%	0.20%
Mortality, expected experience	0.30%	0.30%
Lapse rate, actual experience	4.00%	4.20%
Lapse rate, expected experience	4.80%	5.40%
Supplemental health
Liability for Future Policy Benefit, by Product Segment [Line Items]
Mortality, actual experience	31.80%	32.40%
Mortality, expected experience	26.30%	26.10%
Lapse rate, actual experience	9.70%	8.80%
Lapse rate, expected experience	9.90%	9.30%