Segment and Geographic Data - Assets, capital expenditures and depreciation and amortization by segment (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 04, 2020	Dec. 29, 2018	Dec. 30, 2017
Other Information by Segment
Assets	$ 15,018	$ 14,264
Capital Expenditures	339	369	$ 423
Depreciation and Amortization	416	437	447
Manufacturing group
Other Information by Segment
Assets	14,054	13,247
Capital Expenditures	339	369	423
Depreciation and Amortization	410	429	435
Operating Segment | Finance
Other Information by Segment
Assets	964	1,017
Depreciation and Amortization	6	8	12
Operating Segment | Manufacturing group | Textron Aviation
Other Information by Segment
Assets	4,692	4,290
Capital Expenditures	122	132	128
Depreciation and Amortization	137	145	139
Operating Segment | Manufacturing group | Bell
Other Information by Segment
Assets	2,783	2,652
Capital Expenditures	81	65	73
Depreciation and Amortization	107	108	117
Operating Segment | Manufacturing group | Textron Systems
Other Information by Segment
Assets	2,352	2,254
Capital Expenditures	38	39	60
Depreciation and Amortization	48	54	65
Operating Segment | Manufacturing group | Industrial
Other Information by Segment
Assets	2,781	2,815
Capital Expenditures	97	132	158
Depreciation and Amortization	108	112	105
Corporate
Other Information by Segment
Assets	1,446	1,236
Capital Expenditures	1	1	4
Depreciation and Amortization	$ 10	$ 10	$ 9