Investment Information - Equity method investments and investments in affiliates (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]
Investments accounted for using the equity method	$ 3,774,310	$ 3,077,611
Equity in net income (loss) of investment funds accounted for using the equity method	115,856	366,402	$ 146,693
Balance sheet:
Total assets	47,990,507	45,100,945	43,282,297
Total liabilities	35,069,605	31,545,816	29,294,856
Income statement:
Total revenues	9,614,808	9,249,980	8,508,509
Net income	1,482,423	2,239,462	1,465,711
Credit related funds
Schedule of Equity Method Investments [Line Items]
Investments accounted for using the equity method	1,135,818	1,022,334
Private equity
Schedule of Equity Method Investments [Line Items]
Investments accounted for using the equity method	916,534	436,042
Real estate
Schedule of Equity Method Investments [Line Items]
Investments accounted for using the equity method	535,238	396,395
Lending
Schedule of Equity Method Investments [Line Items]
Investments accounted for using the equity method	531,339	376,649
Infrastructure
Schedule of Equity Method Investments [Line Items]
Investments accounted for using the equity method	245,246	230,070
Equity Funds
Schedule of Equity Method Investments [Line Items]
Investments accounted for using the equity method	169,156	395,090
Fixed income
Schedule of Equity Method Investments [Line Items]
Investments accounted for using the equity method	130,062	101,890
Energy
Schedule of Equity Method Investments [Line Items]
Investments accounted for using the equity method	110,917	119,141
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]
Balance sheet:
Invested assets	74,960,738	58,508,009
Total assets	88,062,991	69,648,905
Total liabilities	27,553,307	17,944,325
Net assets	60,509,684	51,704,580
Income statement:
Total revenues	12,305,082	11,785,949	5,762,098
Total expenses	5,374,047	3,238,606	1,656,029
Net income	$ 6,931,035	$ 8,547,343	$ 4,106,069