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Fair Value Measurements (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Oct. 01, 2021 | Oct. 02, 2020 | Oct. 01, 2021 | Oct. 02, 2020 | Dec. 31, 2020
Total investment gains (losses) | $ 128 | $ 3 | $ 330 | $ (10) |
Realized investment gains (losses) | 10 | 0 | 48 | 0 |
Unrealized investment gains (losses) | 118 | $ 3 | 282 | $ (10) |
Partnership |  |  |  |  |
Equity method investments | $ 1,200 |  | $ 1,200 |  | $ 453

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