Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Operating Activities
Net earnings	$ 1,531	$ 1,563
Adjustments to reconcile to net cash provided by operating activities:
Depreciation and amortization	329	322
Stock-based compensation	70	93
Excess tax benefits from stock-based compensation	(111)	(75)
Deferred income taxes	165	76
Changes in assets and liabilities:
Accounts receivable, net	(463)	(531)
Inventoried costs, net	(130)	43
Prepaid expenses and other assets	27	(30)
Accounts payable and other liabilities	(958)	(514)
Income taxes payable	403	201
Retiree benefits	(318)	5
Other, net	(16)	(50)
Net cash provided by operating activities	529	1,103
Investing activities
Capital expenditures	(334)	(285)
Other investing activities, net	36	(72)
Net cash used in investing activities	(298)	(357)
Financing activities
Common stock repurchases	(2,864)	(2,058)
Net proceeds from issuance of long-term debt	600	0
Cash dividends paid	(458)	(423)
Other financing activities, net	(80)	(13)
Net cash used in financing activities	(2,802)	(2,494)
Decrease in cash and cash equivalents	(2,571)	(1,748)
Cash and cash equivalents, beginning of year	3,863	5,150
Cash and cash equivalents, end of period	$ 1,292	$ 3,402