Segment and Geographic Data - Revenue by Segments And Reconciliation Of Segment Profit To Income From Continuing Operations Before Income Taxes (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Jan. 01, 2022	Jan. 02, 2021
Revenues
Revenues	$ 12,869,000,000	$ 12,382,000,000	$ 11,651,000,000
Reconciliation of segment profit to income from continuing operations before income taxes
Interest expense, net for Manufacturing group	(107,000,000)	(142,000,000)	(166,000,000)
Special charges	0	(25,000,000)	(147,000,000)
Gain on business disposition	0	17,000,000	0
Income from continuing operations before income taxes	1,016,000,000	873,000,000	282,000,000
Operating Segment
Revenues
Revenues	12,869,000,000	12,382,000,000	11,651,000,000
Segment Profit
Segment Profit (Loss)	1,223,000,000	1,134,000,000	751,000,000
Reconciling Items
Reconciliation of segment profit to income from continuing operations before income taxes
Corporate expenses and other, net	(113,000,000)	(129,000,000)	(122,000,000)
Special charges	0	(25,000,000)	(147,000,000)
Inventory Charge	0	0	(55,000,000)
Gain on business disposition	0	17,000,000	0
Manufacturing group | Reconciling Items
Reconciliation of segment profit to income from continuing operations before income taxes
Interest expense, net for Manufacturing group	(94,000,000)	(124,000,000)	(145,000,000)
Finance group
Revenues
Revenues	52,000,000	49,000,000	55,000,000
Textron Aviation
Revenues
Revenues	5,073,000,000	4,566,000,000	3,974,000,000
Textron Aviation | Operating Segment
Reconciliation of segment profit to income from continuing operations before income taxes
Special charges			(65,000,000)
Textron Aviation | Manufacturing group | Operating Segment
Revenues
Revenues	5,073,000,000	4,566,000,000	3,974,000,000
Segment Profit
Segment Profit (Loss)	584,000,000	378,000,000	16,000,000
Bell
Revenues
Revenues	3,091,000,000	3,364,000,000	3,309,000,000
Bell | Manufacturing group | Operating Segment
Revenues
Revenues	3,091,000,000	3,364,000,000	3,309,000,000
Segment Profit
Segment Profit (Loss)	317,000,000	408,000,000	462,000,000
Textron Systems
Revenues
Revenues	1,172,000,000	1,273,000,000	1,313,000,000
Textron Systems | Operating Segment
Reconciliation of segment profit to income from continuing operations before income taxes
Special charges			(37,000,000)
Textron Systems | Manufacturing group | Operating Segment
Revenues
Revenues	1,172,000,000	1,273,000,000	1,313,000,000
Segment Profit
Segment Profit (Loss)	152,000,000	189,000,000	152,000,000
Industrial
Revenues
Revenues	3,465,000,000	3,130,000,000	3,000,000,000
Industrial | Operating Segment
Reconciliation of segment profit to income from continuing operations before income taxes
Special charges		(25,000,000)	(41,000,000)
Industrial | Manufacturing group | Operating Segment
Revenues
Revenues	3,465,000,000	3,130,000,000	3,000,000,000
Segment Profit
Segment Profit (Loss)	165,000,000	140,000,000	111,000,000
Textron eAviation
Revenues
Revenues	16,000,000	0	0
Textron eAviation | Manufacturing group | Operating Segment
Revenues
Revenues	16,000,000	0	0
Segment Profit
Segment Profit (Loss)	(26,000,000)	0	0
Finance
Revenues
Revenues	52,000,000	49,000,000	55,000,000
Finance | Finance group | Operating Segment
Revenues
Revenues	52,000,000	49,000,000	55,000,000
Segment Profit
Segment Profit (Loss)	$ 31,000,000	$ 19,000,000	$ 10,000,000