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Variable Interest Entities (Narrative) (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2021
USD ($)
variable_interest_entities
Dec. 31, 2020
USD ($)
Variable Interest Entity [Line Items]    
Variable interest entities, number of consolidated variable interest entities | variable_interest_entities 1  
Consolidated VIE assets $ 78,317,963 $ 71,688,579
Consolidated VIE liabilities 71,942,755 $ 65,339,591
VIE, not the primary beneficiary, maximum loss exposure, amount 227,000  
Variable Interest Entities    
Variable Interest Entity [Line Items]    
Consolidated VIE assets 288,300  
Consolidated VIE liabilities $ 12,200