Condensed Consolidated Statements of Cash Flows-Reconciliation of net earnings to net cash provided by operating activities (Unaudited) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Reconciliation of net earnings to net cash provided by operating activities
Net earnings	$ 1,474	$ 1,445
Adjustments to reconcile to net cash provided by operating activities:
Depreciation and amortization	345	371
Stock-based compensation	118	111
Excess tax benefits from stock-based compensation	(37)	(41)
Deferred income taxes	89	47
(Increase) decrease in assets:
Accounts receivable, net	(147)	(27)
Inventoried costs, net	10	224
Prepaid expenses and other assets	(53)	(90)
Increase (decrease) in liabilities:
Accounts payable and accruals	(296)	(370)
Income taxes payable	92	32
Retiree benefits	(331)	(99)
Other, net	15	(20)
Net cash provided by operating activities	$ 1,279	$ 1,583