Insurance Liabilities - Weighted-average interest rates (Details)	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
General Insurance
Liability for Future Policy Benefit, Activity [Line Items]
Weighted-average interest rate, original discount rate	1.82%	1.77%	1.61%
Weighted-average interest rate, current discount rate	3.78%	3.21%	3.27%
Individual Retirement
Liability for Future Policy Benefit, Activity [Line Items]
Weighted-average interest rate, original discount rate	3.75%	3.58%	3.23%
Weighted-average interest rate, current discount rate	5.04%	5.32%	2.75%
Group Retirement
Liability for Future Policy Benefit, Activity [Line Items]
Weighted-average interest rate, original discount rate	5.15%	5.17%	4.96%
Weighted-average interest rate, current discount rate	5.02%	5.30%	2.68%
Life Insurance
Liability for Future Policy Benefit, Activity [Line Items]
Weighted-average interest rate, original discount rate	4.10%	4.08%	4.11%
Weighted-average interest rate, current discount rate	5.04%	5.33%	2.85%
Life Insurance | Universal Life
Liability for Future Policy Benefit, Activity [Line Items]
Weighted-average interest rate, current discount rate	3.92%	3.76%	3.74%
Institutional Markets
Liability for Future Policy Benefit, Activity [Line Items]
Weighted-average interest rate, original discount rate	4.14%	3.56%	3.22%
Weighted-average interest rate, current discount rate	4.96%	5.30%	2.71%
Corporate and Other [Member]
Liability for Future Policy Benefit, Activity [Line Items]
Weighted-average interest rate, original discount rate	4.86%	4.88%	4.83%
Weighted-average interest rate, current discount rate	5.08%	5.36%	3.08%
Corporate and Other [Member] | Universal Life
Liability for Future Policy Benefit, Activity [Line Items]
Weighted-average interest rate, current discount rate	4.20%	4.24%	4.21%