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Investment Information - Limited partnership interests (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
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Schedule of Equity Method Investments [Line Items] |  |  |
Maximum Exposure to Loss |  | $ 3,686,444 | $ 3,248,206
Aggregate unfunded commitments |  | 3,100,000 | 3,000,000
Equity method investments |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Maximum Exposure to Loss | [1] | 3,565,946 | 3,077,611
Aggregate unfunded commitments |  | 2,800,000 | 2,600,000
Fair value option |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Maximum Exposure to Loss | [2] | 120,498 | 170,595
Aggregate unfunded commitments |  | $ 21,500 | $ 18,800
[1] | Aggregate unfunded commitments were $2.8 billion at September 30, 2022, compared to $2.6 billion at December 31, 2021.
[2] | Aggregate unfunded commitments were $21.5 million at September 30, 2022, compared to $18.8 million at December 31, 2021.

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