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Special Charges - Special Charges by Segment (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		18 Months Ended
	Oct. 02, 2021	Oct. 03, 2020	Oct. 02, 2021	Oct. 03, 2020	Oct. 02, 2021
Special Charges
Restructuring charges			$ 15
Asset and Other Asset Impairments	$ 0	$ 0	0	$ 39
Special charges	10	7	20	124
Severance Costs
Special Charges
Restructuring charges			8
Contract Termination and Other
Special Charges
Restructuring charges			7
2020 COVID-19 Restructuring Plan
Special Charges
Asset and Other Asset Impairments	6	2	11	17	$ 33
Special charges	10	7	20	85	128
2020 COVID-19 Restructuring Plan \| Severance Costs
Special Charges
Restructuring charges	3	5	3	56
2020 COVID-19 Restructuring Plan \| Contract Termination and Other
Special Charges
Restructuring charges	1	0	6	12
Corporate
Special Charges
Asset and Other Asset Impairments		0		0
Special charges		2		4
Corporate \| 2020 COVID-19 Restructuring Plan
Special Charges
Asset and Other Asset Impairments		0		0
Special charges		2		4	4
Corporate \| 2020 COVID-19 Restructuring Plan \| Severance Costs
Special Charges
Restructuring charges		2		4
Corporate \| 2020 COVID-19 Restructuring Plan \| Contract Termination and Other
Special Charges
Restructuring charges		0		0
Industrial \| Operating Segment
Special Charges
Asset and Other Asset Impairments	0	0	0	7
Special charges	10	5	20	20
Industrial \| Operating Segment \| 2020 COVID-19 Restructuring Plan
Special Charges
Asset and Other Asset Impairments	6	2	11	2
Special charges	10	5	20	13	54
Industrial \| Operating Segment \| 2020 COVID-19 Restructuring Plan \| Severance Costs
Special Charges
Restructuring charges	3	3	3	11
Industrial \| Operating Segment \| 2020 COVID-19 Restructuring Plan \| Contract Termination and Other
Special Charges
Restructuring charges	$ 1	$ 0	$ 6	0
Textron Aviation \| Operating Segment
Special Charges
Asset and Other Asset Impairments				32
Special charges				60
Textron Aviation \| Operating Segment \| 2020 COVID-19 Restructuring Plan
Special Charges
Asset and Other Asset Impairments				1
Special charges				28	33
Textron Aviation \| Operating Segment \| 2020 COVID-19 Restructuring Plan \| Severance Costs
Special Charges
Restructuring charges				27
Textron Aviation \| Operating Segment \| 2020 COVID-19 Restructuring Plan \| Contract Termination and Other
Special Charges
Restructuring charges				0
Textron Systems \| Operating Segment
Special Charges
Asset and Other Asset Impairments				0
Special charges				40
Textron Systems \| Operating Segment \| 2020 COVID-19 Restructuring Plan
Special Charges
Asset and Other Asset Impairments				14
Special charges				40	$ 37
Textron Systems \| Operating Segment \| 2020 COVID-19 Restructuring Plan \| Severance Costs
Special Charges
Restructuring charges				14
Textron Systems \| Operating Segment \| 2020 COVID-19 Restructuring Plan \| Contract Termination and Other
Special Charges
Restructuring charges				$ 12