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Financial Instruments - Investments - Unrealized Gains and Losses Related to Equity Securities (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jul. 02, 2023
Jun. 30, 2024
Jul. 02, 2023
Fair Value Disclosures [Abstract]        
Net (gains)/losses recognized during the period on equity securities [1] $ 342 $ (135) $ 317 $ 316
Less: Net (gains)/losses recognized during the period on equity securities sold during the period (2) (14) (216) (47)
Net unrealized (gains)/losses during the reporting period on equity securities still held at the reporting date [2] $ 344 $ (121) $ 533 $ 363
[1] Reported in Other (income)/deductions––net. See Note 4.
[2] Included in net unrealized (gains)/losses are observable price changes on equity securities without readily determinable fair values. As of June 30, 2024, there were cumulative impairments and downward adjustments of $306 million and upward adjustments of $214 million. Impairments, downward and upward adjustments were not material to our operations in the second quarters and first six months of 2024 and 2023.