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Special Charges - Special Charges by Segment (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 03, 2020	Sep. 28, 2019	Oct. 03, 2020	Sep. 28, 2019
Special Charges
Restructuring charges			$ 68
Special charges	$ 7	$ 0	124	$ 0
Other Asset Impairments	0		39
Severance Costs
Special Charges
Restructuring charges			56
Contract Terminations and Others
Special Charges
Restructuring charges			12
2020 COVID-19 Restructuring Plan
Special Charges
Special charges	7		85
Other Asset Impairments	2		17
2020 COVID-19 Restructuring Plan \| Severance Costs
Special Charges
Restructuring charges	5		56
2020 COVID-19 Restructuring Plan \| Contract Terminations and Others
Special Charges
Restructuring charges	0		12
Corporate
Special Charges
Special charges	2		4
Other Asset Impairments	0		0
Corporate \| 2020 COVID-19 Restructuring Plan
Special Charges
Special charges	2		4
Other Asset Impairments	0		0
Corporate \| 2020 COVID-19 Restructuring Plan \| Severance Costs
Special Charges
Restructuring charges	2		4
Corporate \| 2020 COVID-19 Restructuring Plan \| Contract Terminations and Others
Special Charges
Restructuring charges	0		0
Industrial \| Operating Segment
Special Charges
Special charges	5		20
Other Asset Impairments	0		7
Industrial \| Operating Segment \| 2020 COVID-19 Restructuring Plan
Special Charges
Special charges	5		13
Other Asset Impairments	2		2
Industrial \| Operating Segment \| 2020 COVID-19 Restructuring Plan \| Severance Costs
Special Charges
Restructuring charges	3		11
Industrial \| Operating Segment \| 2020 COVID-19 Restructuring Plan \| Contract Terminations and Others
Special Charges
Restructuring charges	$ 0		0
Textron Aviation \| Operating Segment
Special Charges
Special charges			60
Other Asset Impairments			32
Textron Aviation \| Operating Segment \| 2020 COVID-19 Restructuring Plan
Special Charges
Special charges			28
Other Asset Impairments			1
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 Terminations and Others
Special Charges
Restructuring charges			0
Textron Systems \| Operating Segment
Special Charges
Special charges			40
Other Asset Impairments			0
Textron Systems \| Operating Segment \| 2020 COVID-19 Restructuring Plan
Special Charges
Special charges			40
Other Asset Impairments			14
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 Terminations and Others
Special Charges
Restructuring charges			$ 12