Long-Duration Insurance Contracts - Weighted-Average Durations of LFPB (Details)	Jun. 30, 2023	Jun. 30, 2022
Whole Life
Liability for Future Policy Benefit, by Product Segment [Line Items]
Weighted-average duration	18 years	18 years
Term Life
Liability for Future Policy Benefit, by Product Segment [Line Items]
Weighted-average duration	16 years 4 months 24 days	15 years 10 months 24 days
Experience Life
Liability for Future Policy Benefit, by Product Segment [Line Items]
Weighted-average duration	10 years 6 months	10 years 9 months 18 days
Limited Pay Whole Life
Liability for Future Policy Benefit, by Product Segment [Line Items]
Weighted-average duration	22 years 2 months 12 days	21 years 6 months
Supplemental health
Liability for Future Policy Benefit, by Product Segment [Line Items]
Weighted-average duration	10 years 3 months 18 days	9 years 9 months 18 days
SPIA (life contingent)
Liability for Future Policy Benefit, by Product Segment [Line Items]
Weighted-average duration	7 years 8 months 12 days	7 years 8 months 12 days