Segment Information - Revenue by Segment and Reconciliation of Segment Profit to Income Before Income Taxes (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jul. 02, 2022	Jul. 03, 2021	Jul. 02, 2022	Jul. 03, 2021
Revenues
Total revenues	$ 3,154,000,000	$ 3,191,000,000	$ 6,155,000,000	$ 6,070,000,000
Reconciliation of segment profit to income from continuing operations before income taxes
Special charges	0	(4,000,000)	0	(10,000,000)
Gain on business disposition	0	2,000,000	0	17,000,000
Income from continuing operations before income taxes	263,000,000	218,000,000	495,000,000	408,000,000
Operating Segment
Reconciliation of segment profit to income from continuing operations before income taxes
Segment profit	303,000,000	289,000,000	607,000,000	545,000,000
Reconciling Items
Reconciliation of segment profit to income from continuing operations before income taxes
Corporate expenses and other, net	(12,000,000)	(37,000,000)	(56,000,000)	(77,000,000)
Special charges	0	(4,000,000)	0	(10,000,000)
Gain on business disposition	0	2,000,000	0	17,000,000
Textron Aviation
Revenues
Total revenues	1,284,000,000	1,161,000,000	2,324,000,000	2,026,000,000
Bell
Revenues
Total revenues	687,000,000	891,000,000	1,521,000,000	1,737,000,000
Textron Systems
Revenues
Total revenues	293,000,000	333,000,000	566,000,000	661,000,000
Industrial
Revenues
Total revenues	871,000,000	794,000,000	1,709,000,000	1,619,000,000
Textron eAviation
Revenues
Total revenues	5,000,000	0	5,000,000	0
Finance
Revenues
Total revenues	14,000,000	12,000,000	30,000,000	27,000,000
Finance | Operating Segment
Reconciliation of segment profit to income from continuing operations before income taxes
Segment profit	10,000,000	3,000,000
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	(28,000,000)	(32,000,000)	(56,000,000)	(67,000,000)
Manufacturing group | Textron Aviation | Operating Segment
Revenues
Total revenues	1,284,000,000	1,161,000,000	2,324,000,000	2,026,000,000
Reconciliation of segment profit to income from continuing operations before income taxes
Segment profit	155,000,000	96,000,000	276,000,000	143,000,000
Manufacturing group | Bell | Operating Segment
Revenues
Total revenues	687,000,000	891,000,000	1,521,000,000	1,737,000,000
Reconciliation of segment profit to income from continuing operations before income taxes
Segment profit	63,000,000	110,000,000	161,000,000	215,000,000
Manufacturing group | Textron Systems | Operating Segment
Revenues
Total revenues	293,000,000	333,000,000	566,000,000	661,000,000
Reconciliation of segment profit to income from continuing operations before income taxes
Segment profit	42,000,000	48,000,000	75,000,000	99,000,000
Manufacturing group | Industrial | Operating Segment
Revenues
Total revenues	871,000,000	794,000,000	1,709,000,000	1,619,000,000
Reconciliation of segment profit to income from continuing operations before income taxes
Segment profit	41,000,000	32,000,000	84,000,000	79,000,000
Manufacturing group | Textron eAviation | Operating Segment
Revenues
Total revenues	5,000,000	0	5,000,000	0
Reconciliation of segment profit to income from continuing operations before income taxes
Segment profit	(8,000,000)	0	(8,000,000)	0
Finance group
Revenues
Total revenues	14,000,000	12,000,000	30,000,000	27,000,000
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	$ 14,000,000	$ 12,000,000	30,000,000	27,000,000
Reconciliation of segment profit to income from continuing operations before income taxes
Segment profit			$ 19,000,000	$ 9,000,000