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Investment Information - Limited partnership interests (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Schedule of Equity Method Investments [Line Items] |  |  |
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount |  | $ 4,680 | $ 3,904
Aggregate commitments |  | 3,600 | 2,900
Equity method investments |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount | [1] | 4,566 | 3,774
Aggregate commitments |  | 3,400 | 2,600
Fair value option |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount | [2] | 114 | 130
Aggregate commitments |  | $ 32 | $ 17
[1] | Aggregate unfunded commitments were $3.4 billion at December 31, 2023, consistent with $2.6 billion at December 31, 2022.
[2] | Aggregate unfunded commitments were $32 million at December 31, 2023, compared to $17 million at December 31, 2022.

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