Revenues (Details) $ in Millions	3 Months Ended
	Mar. 31, 2018 USD ($)
Revenues
Total revenues	$ 3,296
United States
Revenues
Total revenues	1,964
International
Revenues
Total revenues	1,332
Commercial
Revenues
Total revenues	2,492
U.S. Government
Revenues
Total revenues	804
Textron Aviation
Revenues
Total revenues	1,010
Textron Aviation | United States
Revenues
Total revenues	665
Textron Aviation | International
Revenues
Total revenues	345
Textron Aviation | Commercial
Revenues
Total revenues	973
Textron Aviation | U.S. Government
Revenues
Total revenues	37
Textron Aviation | Aircraft
Revenues
Total revenues	634
Textron Aviation | Aftermarket parts and services
Revenues
Total revenues	376
Bell
Revenues
Total revenues	752
Bell | United States
Revenues
Total revenues	509
Bell | International
Revenues
Total revenues	243
Bell | Commercial
Revenues
Total revenues	252
Bell | U.S. Government
Revenues
Total revenues	500
Bell | Military aircraft and support programs
Revenues
Total revenues	487
Bell | Commercial helicopters, parts and services
Revenues
Total revenues	265
Textron Systems
Revenues
Total revenues	387
Textron Systems | United States
Revenues
Total revenues	287
Textron Systems | International
Revenues
Total revenues	100
Textron Systems | Commercial
Revenues
Total revenues	127
Textron Systems | U.S. Government
Revenues
Total revenues	260
Textron Systems | Unmanned systems
Revenues
Total revenues	170
Textron Systems | Marine and land systems
Revenues
Total revenues	92
Textron Systems | Simulation, training and other
Revenues
Total revenues	125
Industrial
Revenues
Total revenues	1,131
Industrial | United States
Revenues
Total revenues	496
Industrial | International
Revenues
Total revenues	635
Industrial | Commercial
Revenues
Total revenues	1,124
Industrial | U.S. Government
Revenues
Total revenues	7
Industrial | Fuel systems and functional components
Revenues
Total revenues	655
Industrial | Specialized vehicles
Revenues
Total revenues	348
Industrial | Tools and test equipment
Revenues
Total revenues	128
Finance
Revenues
Finance Revenue	16
Finance | United States
Revenues
Finance Revenue	7
Finance | International
Revenues
Finance Revenue	9
Finance | Commercial
Revenues
Finance Revenue	$ 16