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Fair Values of Assets and Liabilities - Non-Recurring Basis Narrative (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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VIEs, not primary beneficiary | Affordable Housing Partnerships | Nonrecurring basis | Level 3 |  |
Assets and liabilities measured at fair value |  |
Investment balance | $ 41 | $ 58

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