Consolidated Statements of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 25, 2016	Sep. 27, 2015
Operating activities
Net earnings	$ 4,314	$ 2,672
Adjustments to reconcile net earnings to net cash provided by operating activities
Depreciation and amortization	888	726
Stock-based compensation	124	118
Severance charges	99	35
Gain on divestiture of IS&GS business segment	(1,234)
Gain on step acquisition of AWE	(104)
Changes in assets and liabilities
Receivables, net	(1,537)	(861)
Inventories, net	(235)	(359)
Accounts payable	1,033	637
Customer advances and amounts in excess of costs incurred	57	(421)
Postretirement benefit plans	787	868
Income taxes	37	126
Other, net	231	196
Net cash provided by operating activities	4,460	3,737
Investing activities
Capital expenditures	(627)	(500)
Other, net	76	89
Net cash used for investing activities	(551)	(411)
Financing activities
Special cash payment from divestiture of IS&GS business segment	1,800
Issuance of long-term debt, net of related costs		2,213
Repayments of long-term debt	(952)
Repurchases of common stock	(1,280)	(2,364)
Dividends paid	(1,518)	(1,427)
Proceeds from stock option exercises	75	126
Other, net	(229)	(20)
Net cash used for financing activities	(2,104)	(1,472)
Net change in cash and cash equivalents	1,805	1,854
Cash and cash equivalents at beginning of period	1,090	1,446
Cash and cash equivalents at end of period	$ 2,895	$ 3,300