Financial Instruments and Fair Value Measurements - Schedule of Assets Measured at Fair Value on Non-recurring Basis (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Mar. 29, 2025	Sep. 28, 2024
Impairment
Total		$ (172)
Fair Value, Nonrecurring
Assets, Fair Value Disclosure [Abstract]
Indefinite-lived trademarks	$ 26	26
Goodwill	643	624
Definite lived intangible assets	221	200
Property, plant, and equipment	1,519	949
Total	2,409	1,799
Impairment
Indefinite-lived trademarks	0	0
Goodwill	0	(171)
Definite lived intangible assets	0	(1)
Property, plant, and equipment	0	0
Total	0	(172)
Level 1 | Fair Value, Nonrecurring
Assets, Fair Value Disclosure [Abstract]
Indefinite-lived trademarks	0	0
Goodwill	0	0
Definite lived intangible assets	0	0
Property, plant, and equipment	0	0
Total	0	0
Level 2 | Fair Value, Nonrecurring
Assets, Fair Value Disclosure [Abstract]
Indefinite-lived trademarks	0	0
Goodwill	0	0
Definite lived intangible assets	0	0
Property, plant, and equipment	0	0
Total	0	0
Level 3 | Fair Value, Nonrecurring
Assets, Fair Value Disclosure [Abstract]
Indefinite-lived trademarks	26	26
Goodwill	643	624
Definite lived intangible assets	221	200
Property, plant, and equipment	1,519	949
Total	$ 2,409	$ 1,799