Consolidated Statements of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 29, 2019	Sep. 30, 2018
Operating activities
Net earnings	$ 4,732	$ 3,793
Adjustments to reconcile net earnings to net cash provided by operating activities
Depreciation and amortization	867	857
Stock-based compensation	158	148
Gain on property sale	(51)	0
Severance and restructuring charges	0	96
Changes in assets and liabilities
Receivables, net	60	(151)
Contract assets	(1,532)	(1,777)
Inventories	(477)	(172)
Accounts payable	524	1,237
Contract liabilities	286	(539)
Postretirement benefit plans	828	(3,935)
Income taxes	(117)	729
Other, net	543	635
Net cash provided by operating activities	5,821	921
Investing activities
Capital expenditures	(841)	(819)
Other, net	38	146
Net cash used for investing activities	(803)	(673)
Financing activities
Dividends paid	(1,881)	(1,725)
Repurchases of common stock	(710)	(826)
(Repayments of) proceeds from commercial paper, net	(600)	490
Other, net	(60)	(151)
Net cash used for financing activities	(3,251)	(2,212)
Net change in cash and cash equivalents	1,767	(1,964)
Cash and cash equivalents at beginning of period	772	2,861
Cash and cash equivalents at end of period	$ 2,539	$ 897