Revenues - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 30, 2024	Apr. 01, 2023
Disaggregation of Revenue [Line Items]
Revenues	$ 3,135	$ 3,024
United States
Disaggregation of Revenue [Line Items]
Revenues	2,251	2,070
Europe
Disaggregation of Revenue [Line Items]
Revenues	303	305
Other international
Disaggregation of Revenue [Line Items]
Revenues	581	649
Commercial
Disaggregation of Revenue [Line Items]
Revenues	2,372	2,356
U.S. Government
Disaggregation of Revenue [Line Items]
Revenues	763	668
Textron Aviation
Disaggregation of Revenue [Line Items]
Revenues	1,188	1,149
Textron Aviation | United States
Disaggregation of Revenue [Line Items]
Revenues	950	836
Textron Aviation | Europe
Disaggregation of Revenue [Line Items]
Revenues	62	66
Textron Aviation | Other international
Disaggregation of Revenue [Line Items]
Revenues	176	247
Textron Aviation | Commercial
Disaggregation of Revenue [Line Items]
Revenues	1,155	1,107
Textron Aviation | U.S. Government
Disaggregation of Revenue [Line Items]
Revenues	33	42
Textron Aviation | Aircraft
Disaggregation of Revenue [Line Items]
Revenues	732	718
Textron Aviation | Aftermarket parts and services
Disaggregation of Revenue [Line Items]
Revenues	456	431
Bell
Disaggregation of Revenue [Line Items]
Revenues	727	621
Bell | United States
Disaggregation of Revenue [Line Items]
Revenues	559	460
Bell | Europe
Disaggregation of Revenue [Line Items]
Revenues	23	19
Bell | Other international
Disaggregation of Revenue [Line Items]
Revenues	145	142
Bell | Commercial
Disaggregation of Revenue [Line Items]
Revenues	239	232
Bell | U.S. Government
Disaggregation of Revenue [Line Items]
Revenues	488	389
Bell | Military aircraft and support programs
Disaggregation of Revenue [Line Items]
Revenues	480	385
Bell | Commercial helicopters, parts and services
Disaggregation of Revenue [Line Items]
Revenues	247	236
Textron Systems
Disaggregation of Revenue [Line Items]
Revenues	306	306
Textron Systems | United States
Disaggregation of Revenue [Line Items]
Revenues	274	275
Textron Systems | Europe
Disaggregation of Revenue [Line Items]
Revenues	13	14
Textron Systems | Other international
Disaggregation of Revenue [Line Items]
Revenues	19	17
Textron Systems | Commercial
Disaggregation of Revenue [Line Items]
Revenues	72	74
Textron Systems | U.S. Government
Disaggregation of Revenue [Line Items]
Revenues	234	232
Industrial
Disaggregation of Revenue [Line Items]
Revenues	892	932
Industrial | United States
Disaggregation of Revenue [Line Items]
Revenues	460	494
Industrial | Europe
Disaggregation of Revenue [Line Items]
Revenues	198	204
Industrial | Other international
Disaggregation of Revenue [Line Items]
Revenues	234	234
Industrial | Commercial
Disaggregation of Revenue [Line Items]
Revenues	884	927
Industrial | U.S. Government
Disaggregation of Revenue [Line Items]
Revenues	8	5
Industrial | Fuel systems and functional components
Disaggregation of Revenue [Line Items]
Revenues	488	488
Industrial | Specialized vehicles
Disaggregation of Revenue [Line Items]
Revenues	404	444
Textron eAviation
Disaggregation of Revenue [Line Items]
Revenues	7	4
Textron eAviation | United States
Disaggregation of Revenue [Line Items]
Revenues	4	1
Textron eAviation | Europe
Disaggregation of Revenue [Line Items]
Revenues	2	2
Textron eAviation | Other international
Disaggregation of Revenue [Line Items]
Revenues	1	1
Textron eAviation | Commercial
Disaggregation of Revenue [Line Items]
Revenues	7	4
Textron eAviation | U.S. Government
Disaggregation of Revenue [Line Items]
Revenues	0	0
Finance
Disaggregation of Revenue [Line Items]
Revenues	15	12
Finance | United States
Disaggregation of Revenue [Line Items]
Revenues	4	4
Finance | Europe
Disaggregation of Revenue [Line Items]
Revenues	5	0
Finance | Other international
Disaggregation of Revenue [Line Items]
Revenues	6	8
Finance | Commercial
Disaggregation of Revenue [Line Items]
Revenues	15	12
Finance | U.S. Government
Disaggregation of Revenue [Line Items]
Revenues	$ 0	$ 0