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Long-Duration Insurance Contracts - Actual and Expected Experience of Mortality Rate and Lapse Rate (Details)
Mar. 31, 2023
Mar. 31, 2022
Whole Life    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Mortality, actual experience 0.70% 0.80%
Mortality, expected experience 0.70% 0.70%
Lapse rate, actual experience 3.60% 3.00%
Lapse rate, expected experience 4.60% 5.70%
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 5.60% 5.20%
Lapse rate, expected experience 2.80% 2.80%
Term Life | Maximum    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Mortality, actual experience 0.30%  
Mortality, expected experience 0.60% 0.30%
Lapse rate, actual experience 8.30% 76.10%
Lapse rate, expected experience 5.60% 6.60%
Experience Life    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Mortality, actual experience 1.90% 1.80%
Mortality, expected experience 1.60% 1.40%
Lapse rate, actual experience 3.40% 3.10%
Lapse rate, expected experience 3.00% 3.10%
Limited Pay Whole Life    
Liability for Future Policy Benefit, by Product Segment [Line Items]    
Mortality, actual experience 0.00% 0.40%
Mortality, expected experience 0.20% 0.20%
Lapse rate, actual experience 3.60% 2.90%
Lapse rate, expected experience 5.10% 7.20%