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Fair Value Measurements (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Total investment gains (losses) | $ 401 | $ 18 | $ 0
Partnership |  |  |
Equity method investments | $ 1,300 | $ 453 |

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