Segment Information - Revenue by Segment and Reconciliation of Segment Profit to Income Before Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 30, 2024	Apr. 01, 2023
Revenues
Total revenues	$ 3,135	$ 3,024
Reconciliation of segment profit to income from continuing operations before income taxes
Interest expense, net for Manufacturing group	(20)	(20)
Special Charges	(14)	0
Non-service components of pension and postretirement income, net	66	59
Income before income taxes	237	227
Operating Segment
Reconciliation of segment profit to income from continuing operations before income taxes
Segment profit	290	259
Reconciling Items
Reconciliation of segment profit to income from continuing operations before income taxes
Corporate expenses and other, net	(62)	(39)
LIFO inventory provision	(20)	(25)
Intangible asset amortization	(8)	(10)
Special Charges	(14)	0
Non-service components of pension and postretirement income, net	66	59
Textron Aviation
Revenues
Total revenues	1,188	1,149
Bell
Revenues
Total revenues	727	621
Textron Systems
Revenues
Total revenues	306	306
Industrial
Revenues
Total revenues	892	932
Textron eAviation
Revenues
Total revenues	7	4
Finance
Revenues
Total revenues	15	12
Manufacturing group | Reconciling Items
Reconciliation of segment profit to income from continuing operations before income taxes
Interest expense, net for Manufacturing group	(15)	(17)
Manufacturing group | Textron Aviation | Operating Segment
Revenues
Total revenues	1,188	1,149
Reconciliation of segment profit to income from continuing operations before income taxes
Segment profit	143	125
Manufacturing group | Bell | Operating Segment
Revenues
Total revenues	727	621
Reconciliation of segment profit to income from continuing operations before income taxes
Segment profit	80	60
Manufacturing group | Textron Systems | Operating Segment
Revenues
Total revenues	306	306
Reconciliation of segment profit to income from continuing operations before income taxes
Segment profit	38	34
Manufacturing group | Industrial | Operating Segment
Revenues
Total revenues	892	932
Reconciliation of segment profit to income from continuing operations before income taxes
Segment profit	29	41
Manufacturing group | Textron eAviation | Operating Segment
Revenues
Total revenues	7	4
Reconciliation of segment profit to income from continuing operations before income taxes
Segment profit	(18)	(9)
Finance group
Revenues
Total revenues	15	12
Finance group | Finance | Operating Segment
Revenues
Total revenues	15	12
Reconciliation of segment profit to income from continuing operations before income taxes
Segment profit	$ 18	$ 8