Long-Duration Insurance Contracts - Weighted-Average Durations of LFPB (Details)	Dec. 31, 2023	Dec. 31, 2022
Whole Life
Liability for Future Policy Benefit, by Product Segment [Line Items]
Weighted-average duration	18 years	18 years 3 months 18 days
Term Life
Liability for Future Policy Benefit, by Product Segment [Line Items]
Weighted-average duration	16 years 8 months 12 days	16 years 9 months 18 days
Experience life
Liability for Future Policy Benefit, by Product Segment [Line Items]
Weighted-average duration	10 years 3 months 18 days	10 years 7 months 6 days
Limited-pay whole life
Liability for Future Policy Benefit, by Product Segment [Line Items]
Weighted-average duration	22 years 1 month 6 days	22 years 10 months 24 days
Supplemental health
Liability for Future Policy Benefit, by Product Segment [Line Items]
Weighted-average duration	10 years 8 months 12 days	10 years 1 month 6 days
SPIA (life contingent)
Liability for Future Policy Benefit, by Product Segment [Line Items]
Weighted-average duration	7 years 7 months 6 days	7 years 8 months 12 days