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Investment Information - Limited partnership interests (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]    
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount $ 3,248,206 $ 2,232,609
Aggregate commitments 3,000,000 2,100,000
Equity method investments    
Schedule of Equity Method Investments [Line Items]    
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount [1] 3,077,611 2,047,889
Aggregate commitments 2,600,000 1,800,000
Fair value option    
Schedule of Equity Method Investments [Line Items]    
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount [2] 170,595 184,720
Aggregate commitments $ 18,800 $ 35,600
[1] Aggregate unfunded commitments were $2.6 billion at December 31, 2021, compared to $1.8 billion at December 31, 2020.
[2] Aggregate unfunded commitments were $18.8 million at December 31, 2021, compared to $35.6 million at December 31, 2020.