Long-Duration Insurance Contracts - Weighted-Average Durations of LFPB (Details)	Dec. 31, 2024	Dec. 31, 2023
Whole life
Liability for Future Policy Benefit, by Product Segment [Line Items]
Weighted-average duration	20 years	18 years
Term life
Liability for Future Policy Benefit, by Product Segment [Line Items]
Weighted-average duration	16 years	16 years 8 months 12 days
Experience life
Liability for Future Policy Benefit, by Product Segment [Line Items]
Weighted-average duration	10 years	10 years 3 months 18 days
Limited-Pay Whole Life
Liability for Future Policy Benefit, by Product Segment [Line Items]
Weighted-average duration	25 years	22 years 1 month 6 days
Supplemental health
Liability for Future Policy Benefit, by Product Segment [Line Items]
Weighted-average duration	11 years 3 months 18 days	10 years 8 months 12 days
SPIA (life contingent)
Liability for Future Policy Benefit, by Product Segment [Line Items]
Weighted-average duration	8 years	7 years 7 months 6 days