Insurance Liabilities - Weighted-average interest rates (Details)	Jun. 30, 2023	Jun. 30, 2022
General Insurance
Liability for Future Policy Benefit, Activity [Line Items]
Weighted-average interest rate, original discount rate	1.81%	1.67%
Weighted-average interest rate, current discount rate	3.59%	2.68%
Individual Retirement
Liability for Future Policy Benefit, Activity [Line Items]
Weighted-average interest rate, original discount rate	3.73%	3.37%
Weighted-average interest rate, current discount rate	5.27%	4.61%
Group Retirement
Liability for Future Policy Benefit, Activity [Line Items]
Weighted-average interest rate, original discount rate	5.14%	5.20%
Weighted-average interest rate, current discount rate	5.26%	4.58%
Life Insurance
Liability for Future Policy Benefit, Activity [Line Items]
Weighted-average interest rate, original discount rate	4.09%	4.15%
Weighted-average interest rate, current discount rate	5.27%	4.62%
Life Insurance | Universal Life
Liability for Future Policy Benefit, Activity [Line Items]
Weighted-average interest rate, current discount rate	3.77%	3.75%
Institutional Markets
Liability for Future Policy Benefit, Activity [Line Items]
Weighted-average interest rate, original discount rate	3.95%	3.30%
Weighted-average interest rate, current discount rate	5.34%	4.52%
Other Operations before consolidation and eliminations
Liability for Future Policy Benefit, Activity [Line Items]
Weighted-average interest rate, original discount rate	4.88%	4.84%
Weighted-average interest rate, current discount rate	5.25%	4.72%
Other Operations before consolidation and eliminations | Universal Life
Liability for Future Policy Benefit, Activity [Line Items]
Weighted-average interest rate, current discount rate	4.20%	4.20%