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Investment Information - Limited partnership interests (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
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Schedule of Equity Method Investments [Line Items] |  |  |
Maximum Exposure to Loss |  | $ 4,951 | $ 4,680
Aggregate unfunded commitments |  | 3,700 | 3,600
Equity method investments |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Maximum Exposure to Loss | [1] | 4,842 | 4,566
Aggregate unfunded commitments |  | 3,500 | 3,400
Fair value option |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Maximum Exposure to Loss | [2] | 109 | 114
Aggregate unfunded commitments |  | $ 29 | $ 32
[1] | Aggregate unfunded commitments were $3.5 billion at March 31, 2024, compared with $3.4 billion at December 31, 2023.
[2] | Aggregate unfunded commitments were $29 million at March 31, 2024, compared to $32 million at December 31, 2023

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