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Fair Value Measurements (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jul. 02, 2021 | Jul. 03, 2020 | Jul. 02, 2021 | Jul. 03, 2020 | Dec. 31, 2020
Investment gains (losses) | $ 86 | $ (6) | $ 202 | $ (13) |
Realized investment gains (losses) | 11 |  | 38 |  |
Unrealized gain (loss) on investments | 75 | $ (6) | 164 | $ (13) |
Partnership |  |  |  |  |
Equity method investments | $ 875 |  | $ 875 |  | $ 453

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