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Fair Value Measurements (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Apr. 02, 2021 | Apr. 03, 2020 | Dec. 31, 2020
Investment gains/(losses) | $ 116 | $ (7) |
Realized investment gains (losses) | 27 |  |
Unrealized gain (loss) on investments | 89 | $ (7) |
Partnership |  |  |
Equity method investments | $ 729 |  | $ 453

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