CONSOLIDATED STATEMENT OF CASH FLOWS - USD ($) $ in Millions	6 Months Ended		12 Months Ended
	Jan. 03, 2020	Dec. 28, 2018	Dec. 31, 2021	Jan. 01, 2021	Jan. 03, 2020	Jun. 28, 2019
Operating Activities
Net income	$ 834	$ 438	$ 1,842	$ 1,086	$ 1,345	$ 949
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization of acquisition-related intangibles	289		627	709		115
Depreciation and other amortization	153		340	323		143
Share-based compensation	125		129	94		58
Share-based matching contributions under defined contribution plans	102		219	216		83
Qualified pension plan contributions	(328)		(6)	(8)		(1)
Pension and other postretirement benefit plan income	(129)		(375)	(321)		(150)
Gain on pension plan curtailment	(23)		(1)	0		0
Impairment of goodwill and other assets	46		244	767		0
Business divestiture-related (gains) losses	(229)	0	(220)	51	(229)	0
Gain on sale of property, plant and equipment	0		0	(22)		0
Deferred income taxes	0		(114)	(215)		44
(Increase) decrease in:
Accounts receivable	74		217	(250)		(9)
Contract assets	15		(820)	(116)		(25)
Inventories	158		(68)	60		(1)
Prepaid expenses and other current assets	127		23	57		2
Increase (decrease) in:
Accounts payable	(148)		430	173		(84)
Contract liabilities	0		178	14		124
Compensation and benefits	(28)		(44)	43		19
Other accrued items	(128)		20	41		(95)
Income taxes	47		190	61		(23)
Other	(18)		(124)	27		36
Net cash provided by operating activities	939		2,687	2,790		1,185
Investing Activities
Net cash acquired in L3Harris Merger	1,130		0	0		0
Additions to property, plant and equipment	(173)		(342)	(368)		(161)
Proceeds from sale of property, plant and equipment, net	0		7	91		0
Proceeds from sales of businesses, net	343		1,729	1,040		0
Proceeds from sale of property, plant and equipment, net	20		10	0		0
Other investing activities	0		(10)	(12)		2
Net cash provided by (used in) investing activities	1,320		1,394	751		(159)
Financing Activities
Net proceeds from borrowings	396		6	901		27
Repayments of borrowings	(505)		(13)	(931)		(308)
Payments of interest rate derivative obligations	(32)		0	(113)		0
Proceeds from exercises of employee stock options	109		97	56		50
Repurchases of common stock	(1,500)		(3,675)	(2,290)		(200)
Cash dividends	(337)		(817)	(725)		(325)
Tax withholding payments associated with vested share-based awards	(86)		(5)	(4)		(24)
Other financing activities	(16)		(6)	(6)		(1)
Net cash used in financing activities	(1,971)		(4,413)	(3,112)		(781)
Effect of exchange rate changes on cash and cash equivalents	6		(3)	23		(3)
Net (decrease) increase in cash and cash equivalents	294		(335)	452		242
Cash and cash equivalents, beginning of period	530	$ 288	1,276	824		288
Cash and cash equivalents, end of period	$ 824		$ 941	$ 1,276	$ 824	$ 530