Consolidated Statements of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Sep. 24, 2017
Operating activities
Net earnings	$ 3,793	$ 2,707
Adjustments to reconcile net earnings to net cash provided by operating activities
Depreciation and amortization	857	880
Stock-based compensation	148	133
Severance and restructuring charges	96	0
Changes in assets and liabilities
Receivables, net	(151)	(834)
Contract assets	(1,777)	(228)
Inventories	(172)	(66)
Accounts payable	1,237	1,229
Contract liabilities	(539)	(492)
Postretirement benefit plans	(3,935)	1,012
Income taxes	729	(202)
Other, net	635	825
Net cash provided by operating activities	921	4,964
Investing activities
Capital expenditures	(819)	(670)
Other, net	146	15
Net cash used for investing activities	(673)	(655)
Financing activities
Dividends paid	(1,725)	(1,591)
Repurchases of common stock	(826)	(1,500)
Proceeds from issuance of commercial paper, net	490	0
Other, net	(151)	(114)
Net cash used for financing activities	(2,212)	(3,205)
Net change in cash and cash equivalents	(1,964)	1,104
Cash and cash equivalents at beginning of period	2,861	1,837
Cash and cash equivalents at end of period	$ 897	$ 2,941