Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 29, 2020	Mar. 31, 2019
Operating activities
Net earnings	$ 1,717	$ 1,704
Adjustments to reconcile net earnings to net cash provided by operating activities
Depreciation and amortization	301	277
Stock-based compensation	42	37
Gain on property sale	0	(51)
Changes in assets and liabilities
Receivables, net	(555)	(389)
Contract assets	(1,095)	(1,025)
Inventories	80	(288)
Accounts payable	1,894	744
Contract liabilities	151	305
Postretirement benefit plans	(39)	278
Income taxes	167	243
Other, net	(349)	(172)
Net cash provided by operating activities	2,314	1,663
Investing activities
Capital expenditures	(293)	(284)
Other, net	(2)	27
Net cash used for investing activities	(295)	(257)
Financing activities
Dividends paid	(693)	(638)
Repurchases of common stock	(756)	(281)
Repayments of commercial paper, net	0	(200)
Other, net	(96)	(68)
Net cash used for financing activities	(1,545)	(1,187)
Net change in cash and cash equivalents	474	219
Cash and cash equivalents at beginning of period	1,514	772
Cash and cash equivalents at end of period	$ 1,988	$ 991