Revenues (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2018
Revenues
Total revenues	$ 3,726	$ 7,022
United States
Revenues
Total revenues	2,351	4,315
International
Revenues
Total revenues	1,375	2,707
Commercial
Revenues
Total revenues	2,821	5,313
U.S. Government
Revenues
Total revenues	905	1,709
Textron Aviation
Revenues
Total revenues	1,276	2,286
Textron Aviation | United States
Revenues
Total revenues	914	1,579
Textron Aviation | International
Revenues
Total revenues	362	707
Textron Aviation | Commercial
Revenues
Total revenues	1,191	2,164
Textron Aviation | U.S. Government
Revenues
Total revenues	85	122
Textron Aviation | Aircraft
Revenues
Total revenues	877	1,511
Textron Aviation | Aftermarket parts and services
Revenues
Total revenues	399	775
Bell
Revenues
Total revenues	831	1,583
Bell | United States
Revenues
Total revenues	543	1,052
Bell | International
Revenues
Total revenues	288	531
Bell | Commercial
Revenues
Total revenues	291	543
Bell | U.S. Government
Revenues
Total revenues	540	1,040
Bell | Military aircraft and support programs
Revenues
Total revenues	533	1,020
Bell | Commercial helicopters, parts and services
Revenues
Total revenues	298	563
Textron Systems
Revenues
Total revenues	380	767
Textron Systems | United States
Revenues
Total revenues	297	584
Textron Systems | International
Revenues
Total revenues	83	183
Textron Systems | Commercial
Revenues
Total revenues	107	234
Textron Systems | U.S. Government
Revenues
Total revenues	273	533
Textron Systems | Unmanned systems
Revenues
Total revenues	161	331
Textron Systems | Marine and land systems
Revenues
Total revenues	69	161
Textron Systems | Simulation, training and other
Revenues
Total revenues	150	275
Industrial
Revenues
Total revenues	1,222	2,353
Industrial | United States
Revenues
Total revenues	590	1,086
Industrial | International
Revenues
Total revenues	632	1,267
Industrial | Commercial
Revenues
Total revenues	1,215	2,339
Industrial | U.S. Government
Revenues
Total revenues	7	14
Industrial | Fuel systems and functional components
Revenues
Total revenues	627	1,282
Industrial | Specialized vehicles
Revenues
Total revenues	475	823
Industrial | Tools and test equipment
Revenues
Total revenues	120	248
Finance
Revenues
Finance Revenue	17	33
Finance | United States
Revenues
Finance Revenue	7	14
Finance | International
Revenues
Finance Revenue	10	19
Finance | Commercial
Revenues
Finance Revenue	$ 17	$ 33