Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 24, 2018	Jun. 25, 2017
Operating activities
Net earnings	$ 2,320	$ 1,744
Adjustments to reconcile net earnings to net cash provided by operating activities
Depreciation and amortization	566	581
Stock-based compensation	98	101
Severance and restructuring charges	96	0
Changes in assets and liabilities
Receivables, net	(217)	(619)
Contract assets	(1,289)	(170)
Inventories	(160)	(38)
Accounts payable	1,224	940
Contract liabilities	(615)	(388)
Postretirement benefit plans	(2,790)	685
Income taxes	928	3
Other, net	399	371
Net cash provided by operating activities	560	3,210
Investing activities
Capital expenditures	(480)	(448)
Other, net	151	9
Net cash used for investing activities	(329)	(439)
Financing activities
Dividends paid	(1,156)	(1,069)
Repurchases of common stock	(610)	(1,000)
Other, net	(145)	(87)
Net cash used for financing activities	(1,911)	(2,156)
Net change in cash and cash equivalents	(1,680)	615
Cash and cash equivalents at beginning of period	2,861	1,837
Cash and cash equivalents at end of period	$ 1,181	$ 2,452