Revenues - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Apr. 03, 2021	Apr. 04, 2020
Revenues
Revenues	$ 2,879	$ 2,777
United States
Revenues
Revenues	1,900	1,908
Europe
Revenues
Revenues	366	349
Asia and Australia
Revenues
Revenues	267	247
Other international
Revenues
Revenues	346	273
Commercial
Revenues
Revenues	2,005	1,870
U.S. Government
Revenues
Revenues	874	907
Textron Aviation
Revenues
Revenues	865	872
Textron Aviation | United States
Revenues
Revenues	609	597
Textron Aviation | Europe
Revenues
Revenues	84	84
Textron Aviation | Asia and Australia
Revenues
Revenues	76	123
Textron Aviation | Other international
Revenues
Revenues	96	68
Textron Aviation | Commercial
Revenues
Revenues	846	848
Textron Aviation | U.S. Government
Revenues
Revenues	19	24
Textron Aviation | Aircraft
Revenues
Revenues	535	515
Textron Aviation | Aftermarket parts and services
Revenues
Revenues	330	357
Bell
Revenues
Revenues	846	823
Bell | United States
Revenues
Revenues	616	690
Bell | Europe
Revenues
Revenues	36	24
Bell | Asia and Australia
Revenues
Revenues	79	50
Bell | Other international
Revenues
Revenues	115	59
Bell | Commercial
Revenues
Revenues	266	198
Bell | U.S. Government
Revenues
Revenues	580	625
Bell | Military aircraft and support programs
Revenues
Revenues	577	620
Bell | Commercial helicopters, parts and services
Revenues
Revenues	269	203
Textron Systems
Revenues
Revenues	328	328
Textron Systems | United States
Revenues
Revenues	289	286
Textron Systems | Europe
Revenues
Revenues	10	12
Textron Systems | Asia and Australia
Revenues
Revenues	16	20
Textron Systems | Other international
Revenues
Revenues	13	10
Textron Systems | Commercial
Revenues
Revenues	58	71
Textron Systems | U.S. Government
Revenues
Revenues	270	257
Textron Systems | Air systems
Revenues
Revenues	123	136
Textron Systems | Land and sea systems
Revenues
Revenues	57	60
Textron Systems | Other
Revenues
Revenues	148	132
Industrial
Revenues
Revenues	825	740
Industrial | United States
Revenues
Revenues	378	329
Industrial | Europe
Revenues
Revenues	236	228
Industrial | Asia and Australia
Revenues
Revenues	94	53
Industrial | Other international
Revenues
Revenues	117	130
Industrial | Commercial
Revenues
Revenues	820	739
Industrial | U.S. Government
Revenues
Revenues	5	1
Industrial | Fuel systems and functional components
Revenues
Revenues	497	465
Industrial | Specialized vehicles
Revenues
Revenues	328	275
Finance
Revenues
Revenues	15	14
Finance | United States
Revenues
Revenues	8	6
Finance | Europe
Revenues
Revenues	0	1
Finance | Asia and Australia
Revenues
Revenues	2	1
Finance | Other international
Revenues
Revenues	5	6
Finance | Commercial
Revenues
Revenues	15	14
Finance | U.S. Government
Revenues
Revenues	$ 0	$ 0