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Variable Interest Entities (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Dec. 31, 2021
Variable Interest Entity [Line Items] |  |  |  |  |
Gains (losses) for consolidated variable interest entities | $ 0 | $ 0 | $ 0 | $ 0 |
Carrying amount of other investments | 3,820 |  | 3,820 |  | $ 4,292
Limited Partnerships and Limited Liability Companies [Member] |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Carrying amount of other investments | $ 2,900 |  | $ 2,900 |  |

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