Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Operating Activities
Net earnings	$ 484us-gaap_NetIncomeLoss	$ 579us-gaap_NetIncomeLoss
Adjustments to reconcile to net cash used in operating activities:
Depreciation and amortization	99	109
Stock-based compensation	24us-gaap_ShareBasedCompensation	22us-gaap_ShareBasedCompensation
Excess tax benefits from stock-based compensation	(105)	(68)
Deferred income taxes	204	40
Changes in assets and liabilities:
Accounts receivable, net	(325)	(531)
Inventoried costs, net	(76)us-gaap_IncreaseDecreaseInInventories	(66)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other assets	16	(6)
Accounts payable and other liabilities	(889)	(755)
Income taxes payable	366	279
Retiree benefits	(440)	14
Other, net	(12)us-gaap_OtherNoncashIncomeExpense	(19)us-gaap_OtherNoncashIncomeExpense
Net cash used in operating activities	(654)	(402)
Investing activities
Capital expenditures	(117)	(60)
Other investing activities, net	2	(72)
Net cash used in investing activities	(115)	(132)
Financing activities
Common stock repurchases	(825)	(570)
Net proceeds from issuance of long-term debt	600	0
Cash dividends paid	(156)us-gaap_PaymentsOfDividendsCommonStock	(132)us-gaap_PaymentsOfDividendsCommonStock
Other financing activities, net	(67)	(29)
Net cash used in financing activities	(448)	(731)
Decrease in cash and cash equivalents	(1,217)	(1,265)
Cash and cash equivalents, beginning of year	3,863	5,150
Cash and cash equivalents, end of period	$ 2,646	$ 3,885

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