Segment Information - Revenue by Segment and Reconciliation of Segment Profit to Income Before Income Taxes (Details) - USD ($)	3 Months Ended		9 Months Ended
	Oct. 01, 2022	Oct. 02, 2021	Oct. 01, 2022	Oct. 02, 2021
Revenues
Total revenues	$ 3,078,000,000	$ 2,990,000,000	$ 9,233,000,000	$ 9,060,000,000
Reconciliation of segment profit to income from continuing operations before income taxes
Special charges	0	(10,000,000)	0	(20,000,000)
Gain on business disposition	0	0	0	17,000,000
Income from continuing operations before income taxes	264,000,000	218,000,000	759,000,000	626,000,000
Operating Segment
Reconciliation of segment profit to income from continuing operations before income taxes
Segment profit	299,000,000	279,000,000	906,000,000	824,000,000
Reconciling Items
Reconciliation of segment profit to income from continuing operations before income taxes
Corporate expenses and other, net	(14,000,000)	(23,000,000)	(70,000,000)	(100,000,000)
Special charges	0	(10,000,000)	0	(20,000,000)
Gain on business disposition	0	0	0	17,000,000
Textron Aviation
Revenues
Total revenues	1,167,000,000	1,181,000,000	3,491,000,000	3,207,000,000
Bell
Revenues
Total revenues	754,000,000	769,000,000	2,275,000,000	2,506,000,000
Textron Systems
Revenues
Total revenues	292,000,000	299,000,000	858,000,000	960,000,000
Industrial
Revenues
Total revenues	849,000,000	730,000,000	2,558,000,000	2,349,000,000
Textron eAviation
Revenues
Total revenues	5,000,000	0	10,000,000	0
Finance
Revenues
Total revenues	11,000,000	11,000,000	41,000,000	38,000,000
Finance | Operating Segment
Reconciliation of segment profit to income from continuing operations before income taxes
Segment profit	7,000,000	8,000,000
Manufacturing group
Reconciliation of segment profit to income from continuing operations before income taxes
Gain on business disposition			0	17,000,000
Manufacturing group | Reconciling Items
Reconciliation of segment profit to income from continuing operations before income taxes
Interest expense, net for Manufacturing group	(21,000,000)	(28,000,000)	(77,000,000)	(95,000,000)
Manufacturing group | Textron Aviation | Operating Segment
Revenues
Total revenues	1,167,000,000	1,181,000,000	3,491,000,000	3,207,000,000
Reconciliation of segment profit to income from continuing operations before income taxes
Segment profit	139,000,000	98,000,000	415,000,000	241,000,000
Manufacturing group | Bell | Operating Segment
Revenues
Total revenues	754,000,000	769,000,000	2,275,000,000	2,506,000,000
Reconciliation of segment profit to income from continuing operations before income taxes
Segment profit	85,000,000	105,000,000	246,000,000	320,000,000
Manufacturing group | Textron Systems | Operating Segment
Revenues
Total revenues	292,000,000	299,000,000	858,000,000	960,000,000
Reconciliation of segment profit to income from continuing operations before income taxes
Segment profit	37,000,000	45,000,000	112,000,000	144,000,000
Manufacturing group | Industrial | Operating Segment
Revenues
Total revenues	849,000,000	730,000,000	2,558,000,000	2,349,000,000
Reconciliation of segment profit to income from continuing operations before income taxes
Segment profit	39,000,000	23,000,000	123,000,000	102,000,000
Manufacturing group | Textron eAviation | Operating Segment
Revenues
Total revenues	5,000,000	0	10,000,000	0
Reconciliation of segment profit to income from continuing operations before income taxes
Segment profit	(8,000,000)	0	(16,000,000)	0
Finance group
Revenues
Total revenues	11,000,000	11,000,000	41,000,000	38,000,000
Reconciliation of segment profit to income from continuing operations before income taxes
Gain on business disposition			0	0
Finance group | Finance | Operating Segment
Revenues
Total revenues	$ 11,000,000	$ 11,000,000	41,000,000	38,000,000
Reconciliation of segment profit to income from continuing operations before income taxes
Segment profit			$ 26,000,000	$ 17,000,000