Segment and Geographic Data - Assets, Capital Expenditures and Depreciation and Amortization by Segment (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 02, 2021	Jan. 04, 2020	Dec. 29, 2018
Other Information by Segment
Assets	$ 15,443	$ 15,018
Capital Expenditures	317	339	$ 369
Depreciation and Amortization	391	416	437
Manufacturing group
Other Information by Segment
Assets	14,505	14,054
Capital Expenditures	317	339	369
Depreciation and Amortization	386	410	429
Corporate
Other Information by Segment
Assets	2,587	1,446
Capital Expenditures	2	1	1
Depreciation and Amortization	12	10	10
Textron Aviation | Operating Segment | Manufacturing group
Other Information by Segment
Assets	4,380	4,692
Capital Expenditures	94	122	132
Depreciation and Amortization	138	137	145
Bell | Operating Segment | Manufacturing group
Other Information by Segment
Assets	2,984	2,783
Capital Expenditures	117	81	65
Depreciation and Amortization	91	107	108
Textron Systems | Operating Segment | Manufacturing group
Other Information by Segment
Assets	2,054	2,352
Capital Expenditures	42	38	39
Depreciation and Amortization	43	48	54
Industrial | Operating Segment | Manufacturing group
Other Information by Segment
Assets	2,500	2,781
Capital Expenditures	62	97	132
Depreciation and Amortization	102	108	112
Finance | Operating Segment
Other Information by Segment
Assets	938	964
Capital Expenditures	0	0	0
Depreciation and Amortization	$ 5	$ 6	$ 8