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Financial Instruments - Investments - Unrealized Gains and Losses Related to Equity Securities (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 28, 2025
Sep. 29, 2024
Sep. 28, 2025
Sep. 29, 2024
Fair Value Disclosures [Abstract]        
Net (gains)/losses recognized during the period on equity securities [1] $ (201) $ (446) $ 94 [2] $ (129) [2]
Less: Net (gains)/losses recognized during the period on equity securities sold during the period (224) (914) (1,159) (1,129)
Net unrealized (gains)/losses during the reporting period on equity securities still held at the reporting date [3] $ 23 $ 468 $ 1,253 $ 1,000
[1] Reported in Other (income)/deductions––net. See Note 4.
[2] The net losses in the first nine months of 2025 include, among other things, a net loss of $144 million related to our previous investment in Haleon, composed of unrealized losses of $1.0 billion, partially offset by $900 million in realized gains on the sales of our remaining investment in the first quarter of 2025.
[3] Included in net unrealized (gains)/losses are observable price changes on equity securities without readily determinable fair values. As of September 28, 2025, there were cumulative impairments and downward adjustments of $467 million and upward adjustments of $239 million. Impairments, downward and upward adjustments were not material to our operations in the third quarters and first nine months of 2025 and 2024.