Segment Financial Information - Assets, Capital Expenditures and Depreciation and Amortization by Segment (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 03, 2026	Dec. 28, 2024	Dec. 30, 2023
Other Information by Segment
Assets	$ 18,129	$ 16,838
Capital Expenditures	383	364	$ 402
Depreciation and Amortization	401	382	395
Manufacturing group
Other Information by Segment
Assets	17,452	16,158
Depreciation and Amortization	401	382	395
Corporate
Other Information by Segment
Assets	4,688	3,842
Capital Expenditures	1	0	2
Depreciation and Amortization	7	7	9
Textron Aviation \| Operating Segment \| Manufacturing group
Other Information by Segment
Assets	4,907	4,624
Capital Expenditures	140	136	138
Depreciation and Amortization	167	164	160
Bell \| Operating Segment \| Manufacturing group
Other Information by Segment
Assets	3,132	2,992
Capital Expenditures	132	122	119
Depreciation and Amortization	103	86	89
Textron Systems \| Operating Segment \| Manufacturing group
Other Information by Segment
Assets	2,107	2,036
Capital Expenditures	41	40	48
Depreciation and Amortization	48	48	41
Industrial \| Operating Segment \| Manufacturing group
Other Information by Segment
Assets	2,305	2,378
Capital Expenditures	68	62	91
Depreciation and Amortization	68	70	89
Textron eAviation \| Operating Segment \| Manufacturing group
Other Information by Segment
Assets	313	286
Capital Expenditures	1	4	4
Depreciation and Amortization	8	7	7
Finance \| Operating Segment
Other Information by Segment
Assets	677	680
Capital Expenditures	0	0	0
Depreciation and Amortization	$ 0	$ 0	$ 0