Revenues (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 29, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 30, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Revenues
Total revenues									$ 13,972	$ 14,198	$ 13,788
United States
Revenues
Total revenues									8,667
Europe
Revenues
Total revenues									2,187
Asia and Australia
Revenues
Total revenues									1,253
Other international
Revenues
Total revenues									1,865
Commercial
Revenues
Total revenues									10,622
U.S. Government
Revenues
Total revenues									3,350	3,100	3,400
Textron Aviation
Revenues
Total revenues									4,971	4,686	4,921
Textron Aviation | United States
Revenues
Total revenues									3,379
Textron Aviation | Europe
Revenues
Total revenues									612
Textron Aviation | Asia and Australia
Revenues
Total revenues									336
Textron Aviation | Other international
Revenues
Total revenues									644
Textron Aviation | Commercial
Revenues
Total revenues									4,734
Textron Aviation | U.S. Government
Revenues
Total revenues									237
Textron Aviation | Aircraft
Revenues
Total revenues									3,435	3,112	3,412
Textron Aviation | Aftermarket parts and services
Revenues
Total revenues									1,536	1,574	1,509
Bell
Revenues
Total revenues									3,180	3,317	3,239
Bell | United States
Revenues
Total revenues									2,186
Bell | Europe
Revenues
Total revenues									162
Bell | Asia and Australia
Revenues
Total revenues									427
Bell | Other international
Revenues
Total revenues									405
Bell | Commercial
Revenues
Total revenues									1,114
Bell | U.S. Government
Revenues
Total revenues									2,066
Bell | Military aircraft and support programs
Revenues
Total revenues									2,030	2,076	2,087
Bell | Commercial helicopters, parts and services
Revenues
Total revenues									1,150	1,241	1,152
Textron Systems
Revenues
Total revenues									1,464	1,840	1,756
Textron Systems | United States
Revenues
Total revenues									1,118
Textron Systems | Europe
Revenues
Total revenues									74
Textron Systems | Asia and Australia
Revenues
Total revenues									127
Textron Systems | Other international
Revenues
Total revenues									145
Textron Systems | Commercial
Revenues
Total revenues									431
Textron Systems | U.S. Government
Revenues
Total revenues									1,033
Textron Systems | Unmanned systems
Revenues
Total revenues									612	714	763
Textron Systems | Marine and land systems
Revenues
Total revenues									311	470	294
Textron Systems | Simulation, training and other
Revenues
Total revenues									541	656	699
Industrial
Revenues
Total revenues									4,291	4,286	3,794
Industrial | United States
Revenues
Total revenues									1,957
Industrial | Europe
Revenues
Total revenues									1,333
Industrial | Asia and Australia
Revenues
Total revenues									357
Industrial | Other international
Revenues
Total revenues									644
Industrial | Commercial
Revenues
Total revenues									4,277
Industrial | U.S. Government
Revenues
Total revenues									14
Industrial | Fuel systems and functional components
Revenues
Total revenues									2,352	2,330	2,273
Industrial | Specialized vehicles
Revenues
Total revenues									1,691	1,486	1,080
Industrial | Tools and test equipment
Revenues
Total revenues									248	470	441
Finance
Revenues
Total revenues									66	69	78
Finance Revenue	$ 18	$ 15	$ 17	$ 16	$ 15	$ 18	$ 18	$ 18	66	$ 69	$ 78
Finance | United States
Revenues
Total revenues									27
Finance | Europe
Revenues
Total revenues									6
Finance | Asia and Australia
Revenues
Total revenues									6
Finance | Other international
Revenues
Total revenues									27
Finance | Commercial
Revenues
Total revenues									$ 66