Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Operating Activities
Net earnings	$ 1,675	$ 1,531
Adjustments to reconcile to net cash provided by operating activities:
Depreciation and amortization	322	329
Stock-based compensation	61	70
Excess tax benefits from stock-based compensation	0	(111)
Deferred income taxes	(13)	165
Changes in assets and liabilities:
Accounts receivable, net	(830)	(463)
Inventoried costs, net	14	(130)
Prepaid expenses and other assets	(144)	27
Accounts payable and other liabilities	(292)	(958)
Income taxes payable	218	403
Retiree benefits	318	(318)
Other, net	(47)	(16)
Net cash provided by operating activities	1,282	529
Investing activities
Capital expenditures	(608)	(334)
Other, net	3	36
Net cash used in investing activities	(605)	(298)
Financing activities
Common stock repurchases	(1,149)	(2,864)
Net proceeds from issuance of long-term debt	0	600
Repayments of long-term debt	(107)	0
Cash dividends paid	(482)	(458)
Payments of employees taxes withheld from share-based awards	(152)	(183)
Other, net	(3)	103
Net cash used in financing activities	(1,893)	(2,802)
Decrease in cash and cash equivalents	(1,216)	(2,571)
Cash and cash equivalents, beginning of year	2,319	3,863
Cash and cash equivalents, end of period	$ 1,103	$ 1,292