Investments (Equity Method Investments, Statement of Financial Position) (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Schedule of Equity Method Investments [Line Items]
Invested assets	$ 189,299,841	$ 221,661,364
Total liabilities	184,936,310	215,706,270
Partners' capital	4,363,531	5,955,094
Total liabilities and partners’ capital	189,299,841	221,661,364
LP/LLC Interests
Schedule of Equity Method Investments [Line Items]
Total liabilities and partners’ capital included above	815,783	746,870
Equity in LP/LLC interests not included above	214,442	201,541
Carrying value	1,030,225	948,411
Equity Method Investment
Schedule of Equity Method Investments [Line Items]
Invested assets	67,721,613	72,416,906
Total liabilities	12,174,133	12,120,390
Partners' capital	55,547,480	60,296,516
Total liabilities and partners’ capital	$ 67,721,613	$ 72,416,906