Variable Interest Entities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Variable Interest Entity [Line Items]
Assets	$ 71,277,521	$ 34,915,599
Total liabilities	63,221,335	31,477,274
Commitments approved	313	0	$ 4,657
Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Commitments approved	211,800	10,100
Other Investments [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Assets	144,900	61,500
Unfunded Loan Commitment [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Variable interest entities, total exposure of other investments including unfunded commitments	$ 243,900	$ 95,900