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Variable Interest Entities (Unconsolidated VIEs) (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Variable Interest Entity [Line Items]    
Total assets $ 78,349,109 $ 71,688,579
Variable Interest Entity, Not Primary Beneficiary | Fixed Maturity Securities, Available For Sale    
Variable Interest Entity [Line Items]    
Total assets 459,681 0
VIE, not the primary beneficiary, maximum loss exposure, amount 459,681 0
Variable Interest Entity, Not Primary Beneficiary | Other Investments    
Variable Interest Entity [Line Items]    
Total assets 345,000 0
VIE, not the primary beneficiary, maximum loss exposure, amount $ 345,000 $ 0