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Investment Information - Limited partnership interests (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022
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Schedule of Equity Method Investments [Line Items] |  |  |
Maximum Exposure to Loss |  | $ 4,026 | $ 3,905
Aggregate unfunded commitments |  | 2,900 | 2,900
Equity method investments |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Maximum Exposure to Loss | [1] | 3,896 | 3,774
Aggregate unfunded commitments |  | 2,600 | 2,600
Fair value option |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Maximum Exposure to Loss | [2] | 130 | 131
Aggregate unfunded commitments |  | $ 61 | $ 17
[1] | Aggregate unfunded commitments were $2.6 billion at March 31, 2023, compared with $2.6 billion at December 31, 2022.
[2] | Aggregate unfunded commitments were $61 million at March 31, 2023, compared to $17 million at December 31, 2022.

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