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Financial Instruments and Fair Value Measurements, Assets Measured at Fair Value on Non-Recurring Basis (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Jan. 02, 2021
Sep. 28, 2019
Sep. 26, 2020
Impairment [Abstract]      
Indefinite lived trademarks $ 0 $ 0  
Goodwill 0 0  
Definite lived intangible assets 0 0  
Property, plant and equipment 0 2  
Impairment charges 0 $ 2  
Fair Value Adjustment [Abstract]      
Fair value of long-term indebtedness greater/(less) than book value 177    
Fair Value on Nonrecurring Basis [Member]      
Fair Value of Assets [Abstract]      
Indefinite lived trademarks 248   $ 248
Goodwill 5,312   5,173
Definite lived intangible assets 2,241   2,249
Property, plant and equipment 4,734   4,561
Total 12,535   12,231
Fair Value on Nonrecurring Basis [Member] | Level 1 [Member]      
Fair Value of Assets [Abstract]      
Indefinite lived trademarks 0   0
Goodwill 0   0
Definite lived intangible assets 0   0
Property, plant and equipment 0   0
Total 0   0
Fair Value on Nonrecurring Basis [Member] | Level 2 [Member]      
Fair Value of Assets [Abstract]      
Indefinite lived trademarks 0   0
Goodwill 0   0
Definite lived intangible assets 0   0
Property, plant and equipment 0   0
Total 0   0
Fair Value on Nonrecurring Basis [Member] | Level 3 [Member]      
Fair Value of Assets [Abstract]      
Indefinite lived trademarks 248   248
Goodwill 5,312   5,173
Definite lived intangible assets 2,241   2,249
Property, plant and equipment 4,734   4,561
Total $ 12,535   $ 12,231