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Variable Interest Entities (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Dec. 31, 2022
Variable Interest Entity [Line Items] |  |  |  |  |
Gains (losses) for consolidated variable interest entities | $ 0 | $ 0 | $ 0 | $ 0 |
Carrying amount of other investments | 4,195 |  | 4,195 |  | $ 3,739
Limited Partnerships and Limited Liability Companies [Member] |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Carrying amount of other investments | $ 3,300 |  | $ 3,300 |  | $ 3,100

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