Condensed Consolidated Statements of Cash Flows-Reconciliation of net earnings to net cash provided by operating activities (USD $) In Millions, unless otherwise specified	6 Months Ended
Jun. 30, 2013	Jun. 30, 2012
Reconciliation of net earnings to net cash provided by operating activities
Net earnings	$ 977	$ 986
Adjustments to reconcile to net cash provided by operating activities:
Depreciation and amortization	225	243
Stock-based compensation	71	76
Excess tax benefits from stock-based compensation	(27)	(29)
Deferred income taxes	33	(21)
(Increase) decrease in assets:
Accounts receivable, net	(268)	(175)
Inventoried costs, net	62	143
Prepaid expenses and other assets	6	(95)
Increase (decrease) in liabilities:
Accounts payable and accruals	(430)	(453)
Income taxes payable	60	(22)
Retiree benefits	(397)	137
Other, net	17	(19)
Net cash provided by operating activities	$ 329	$ 771

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