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Variable Interest Entities - Schedule of Aggregate Assets, Liabilities, and Our Exposure to Loss from those VIEs (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Variable Interest Entity [Line Items]    
Assets $ 38,258,280 $ 37,727,460
Total liabilities 32,984,339 32,433,029
Variable Interest Entity, Not Primary Beneficiary [Member] | Debt and equity [member]    
Variable Interest Entity [Line Items]    
Assets 731,832 798,266
Total liabilities 285,120 278,602
Gain (Loss) on Price Risk Derivatives, Net 40,062 40,088
Variable Interest Entity, Not Primary Beneficiary [Member] | Miscellaneous Investments [Member]    
Variable Interest Entity [Line Items]    
Assets 466,060 456,286
Total liabilities 275,009 277,924
Gain (Loss) on Price Risk Derivatives, Net 40,062 40,088
Variable Interest Entity, Not Primary Beneficiary [Member] | Partnership Interest [Member]    
Variable Interest Entity [Line Items]    
Assets 265,772 341,980
Total liabilities 10,111 678
Gain (Loss) on Price Risk Derivatives, Net $ 0 $ 0