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Financial Instruments and Fair Value Measurements, Assets Measured at Fair Value on Non-Recurring Basis (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Mar. 28, 2020
Sep. 28, 2019
Impairment [Abstract]    
Indefinite-lived trademarks $ 0 $ 0
Goodwill 0 0
Definite lived intangible assets 0 0
Property, plant, and equipment 2 8
Impairment charges 2 8
Fair Value Adjustment [Abstract]    
Fair value of long-term indebtedness greater/(less) than book value (163)  
Fair Value on Nonrecurring Basis [Member]    
Fair Value of Assets [Abstract]    
Indefinite-lived trademarks 248 248
Goodwill 5,162 5,051
Definite lived intangible assets 2,358 2,532
Property, plant, and equipment 4,467 4,714
Total 12,235 12,545
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 5,162 5,051
Definite lived intangible assets 2,358 2,532
Property, plant, and equipment 4,467 4,714
Total $ 12,235 $ 12,545