Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Operating Activities
Net earnings	$ 1,192	$ 1,073
Adjustments to reconcile to net cash provided by operating activities:
Depreciation and amortization	211	209
Stock-based compensation	42	37
Deferred income taxes	(47)	(89)
Changes in assets and liabilities:
Accounts receivable, net	(981)	(647)
Inventoried costs, net	(223)	(170)
Prepaid expenses and other assets	(25)	7
Accounts payable and other liabilities	(310)	(287)
Income taxes payable	90	225
Retiree benefits	165	209
Other, net	(46)	(23)
Net cash provided by operating activities	68	544
Investing activities
Capital expenditures	(433)	(471)
Other, net	7	2
Net cash used in investing activities	(426)	(469)
Financing activities
Common stock repurchases	(367)	(682)
Payments of long-term debt	0	(107)
Cash dividends paid	(341)	(322)
Payments of employee taxes withheld from share-based awards	(91)	(150)
Other, net	(1)	6
Net cash used in financing activities	(800)	(1,255)
Decrease in cash and cash equivalents	(1,158)	(1,180)
Cash and cash equivalents, beginning of year	2,541	2,319
Cash and cash equivalents, end of period	$ 1,383	$ 1,139