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Capital and treasury stock - Narrative (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Billions
12 Months Ended
Jan. 02, 2024
Dec. 31, 2023
Jan. 01, 2023
Jan. 02, 2022
Sep. 14, 2022
Equity, Class of Treasury Stock [Line Items]          
Common stock, shares issued (in shares)   3,119,843 3,119,843 3,119,843  
Cash dividends paid (in dollars per share)   $ 4.70 $ 4.45 $ 4.19  
Subsequent Event          
Equity, Class of Treasury Stock [Line Items]          
Cash dividend (in dollars per share) $ 1.19        
December 17, 2018 Share Repurchase Program          
Equity, Class of Treasury Stock [Line Items]          
Stock repurchase program, authorized amount         $ 5.0