Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Operating Activities
Net earnings	$ 556	$ 484
Adjustments to reconcile to net cash used in operating activities:
Depreciation and amortization	103	99
Stock-based compensation	14	24
Excess tax benefits from stock-based compensation	0	(105)
Deferred income taxes	(35)	204
Changes in assets and liabilities:
Accounts receivable, net	(514)	(325)
Inventoried costs, net	(89)	(76)
Prepaid expenses and other assets	(4)	16
Accounts payable and other liabilities	(364)	(889)
Income taxes payable	174	366
Retiree benefits	105	(440)
Other, net	(6)	(12)
Net cash used in operating activities	(60)	(654)
Investing activities
Capital expenditures	(298)	(117)
Other, net	0	2
Net cash used in investing activities	(298)	(115)
Financing activities
Common stock repurchases	(282)	(825)
Net proceeds from issuance of long-term debt	0	600
Repayments of Long-term Debt	(107)	0
Cash dividends paid	(159)	(156)
Payments Related to Tax Withholding for Share-based Compensation	(137)	(171)
Other, net	1	104
Net cash used in financing activities	(684)	(448)
Decrease in cash and cash equivalents	(1,042)	(1,217)
Cash and cash equivalents, beginning of year	2,319	3,863
Cash and cash equivalents, end of period	$ 1,277	$ 2,646