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Segment and Geographic Data - Revenue by Segments And Reconciliation Of Segment Profit To Income From Continuing Operations Before Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Jul. 04, 2020	Jan. 01, 2022	Jan. 02, 2021	Jan. 04, 2020
Revenues
Revenues		$ 12,382	$ 11,651	$ 13,630
Reconciliation of segment profit to income from continuing operations before income taxes
Special charges		(25)	(147)	(72)
Income from continuing operations before income taxes		873	282	942
Operating Segment
Revenues
Revenues		12,382	11,651	13,630
Segment Profit
Segment Profit		1,134	751	1,270
Reconciling Items
Reconciliation of segment profit to income from continuing operations before income taxes
Corporate expenses and other, net		(129)	(122)	(110)
Special charges		(25)	(147)	(72)
Inventory Charge	$ (55)	0	(55)	0
Gain on business disposition		17	0	0
Manufacturing group \| Reconciling Items
Reconciliation of segment profit to income from continuing operations before income taxes
Interest expense, net for Manufacturing group		(124)	(145)	(146)
Finance group
Revenues
Revenues		49	55	66
Textron Aviation
Revenues
Revenues		4,566	3,974	5,187
Textron Aviation \| Operating Segment
Reconciliation of segment profit to income from continuing operations before income taxes
Special charges			(65)	(29)
Textron Aviation \| Manufacturing group \| Operating Segment
Revenues
Revenues		4,566	3,974	5,187
Segment Profit
Segment Profit		378	16	449
Bell
Revenues
Revenues		3,364	3,309	3,254
Bell \| Manufacturing group \| Operating Segment
Revenues
Revenues		3,364	3,309	3,254
Segment Profit
Segment Profit		408	462	435
Textron Systems
Revenues
Revenues		1,273	1,313	1,325
Textron Systems \| Operating Segment
Reconciliation of segment profit to income from continuing operations before income taxes
Special charges			(37)
Textron Systems \| Manufacturing group \| Operating Segment
Revenues
Revenues		1,273	1,313	1,325
Segment Profit
Segment Profit		189	152	141
Industrial
Revenues
Revenues		3,130	3,000	3,798
Industrial \| Operating Segment
Reconciliation of segment profit to income from continuing operations before income taxes
Special charges		(25)	(41)	(38)
Industrial \| Manufacturing group \| Operating Segment
Revenues
Revenues		3,130	3,000	3,798
Segment Profit
Segment Profit		140	111	217
Finance
Revenues
Revenues		49	55	66
Finance \| Finance group \| Operating Segment
Revenues
Revenues		49	55	66
Segment Profit
Segment Profit		$ 19	$ 10	$ 28