Long-Duration Insurance Contracts - Actual and Expected Experience of Mortality Rate and Lapse Rate (Details)	Dec. 31, 2025	Dec. 31, 2024
Whole Life
Liability for Future Policy Benefit, by Product Segment [Line Items]
Mortality, actual experience	0.80%	0.70%
Mortality, expected experience	0.80%	0.80%
Lapse rate, actual experience	4.00%	3.00%
Lapse rate, expected experience	3.80%	4.50%
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	4.10%	3.90%
Lapse rate, expected experience	5.20%	5.60%
Term Life | Maximum
Liability for Future Policy Benefit, by Product Segment [Line Items]
Mortality, actual experience	0.90%	0.50%
Mortality, expected experience	1.80%	1.70%
Lapse rate, actual experience	17.40%	38.20%
Lapse rate, expected experience	16.70%	21.90%
Experience life
Liability for Future Policy Benefit, by Product Segment [Line Items]
Mortality, actual experience	1.70%	1.80%
Mortality, expected experience	1.90%	1.70%
Lapse rate, actual experience	3.90%	2.90%
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	0.40%	0.10%
Mortality, expected experience	0.30%	0.30%
Lapse rate, actual experience	3.70%	4.00%
Lapse rate, expected experience	4.00%	4.80%
Supplemental health
Liability for Future Policy Benefit, by Product Segment [Line Items]
Mortality, actual experience	29.80%	31.80%
Mortality, expected experience	26.50%	26.30%
Lapse rate, actual experience	10.90%	9.70%
Lapse rate, expected experience	10.20%	9.90%