CONSOLIDATED STATEMENT OF CASH FLOWS - USD ($) $ in Millions	6 Months Ended			12 Months Ended
	Jan. 03, 2020	Dec. 28, 2018	Dec. 29, 2017	Jan. 01, 2021	Jan. 03, 2020	Jun. 28, 2019	Jun. 29, 2018
Operating Activities
Net income	$ 834	$ 438		$ 1,086	$ 1,345	$ 949	$ 699
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization of acquisition-related intangibles	289			709		115	117
Depreciation and other amortization	153			323		143	142
Share-based compensation	125			94		58	51
Share-based matching contributions under defined contribution plans	102			216		83	31
Qualified pension plan contributions	(328)			(8)		(1)	(301)
Pension and other postretirement benefit plan income	(129)			(321)		(150)	(144)
Gain on pension plan curtailment	(23)			0		0	0
Impairment of goodwill and other assets	46			767		0	0
Business divestiture-related losses (gains)	(229)	0		51	(229)	0	0
Gain on sale of property, plant and equipment	0			(22)		0	0
Gain on sale of asset group	(12)			0		0	0
(Gain) loss on extinguishment of debts	2			(2)		0	24
Deferred income taxes	0			(215)		44	320
(Increase) decrease in:
Accounts receivable	74			(250)		(9)	(101)
Contract assets	15			(116)		(25)	(76)
Inventories	158			60		(1)	(19)
Increase (decrease) in:
Accounts payable	(148)			173		(84)	82
Contract liabilities	0			14		124	81
Compensation and benefits	(28)			43		19	2
Other accrued items	(128)			19		(78)	(38)
Income taxes	47			61		(23)	(117)
Other	119			108		21	(2)
Net cash provided by operating activities	939			2,790		1,185	751
Investing Activities
Net cash acquired in L3Harris Merger	1,130			0		0	0
Additions to property, plant and equipment	(173)			(368)		(161)	(136)
Proceeds from sale of property, plant and equipment, net	0			91		0	0
Proceeds from sales of businesses, net	343			1,040		0	0
Proceeds from sale of property, plant and equipment, net	20			0		0	0
Other investing activities	0			(12)		2	(5)
Net cash provided by (used in) investing activities	1,320			751		(159)	(141)
Financing Activities
Net proceeds from borrowings	396			901		27	1,387
Repayments of borrowings	(505)			(931)		(308)	(1,658)
Payments of interest rate derivative obligations	(32)			(113)		0	0
Proceeds from exercises of employee stock options	109			56		50	34
Repurchases of common stock	(1,500)			(2,290)		(200)	(272)
Cash dividends	(337)			(725)		(325)	(272)
Tax withholding payments associated with vested share-based awards	(86)			(4)		(24)	(17)
Other financing activities	(16)			(6)		(1)	(7)
Net cash used in financing activities	(1,971)			(3,112)		(781)	(805)
Effect of exchange rate changes on cash and cash equivalents	6			23		(3)	(1)
Net increase (decrease) in cash and cash equivalents	294		$ (196)	452		242
Cash and cash equivalents, beginning of period	530	$ 288	$ 484	824		288	484
Cash and cash equivalents, end of period	$ 824			$ 1,276	$ 824	$ 530	$ 288