Condensed Consolidated Statements of Cash Flows-Reconciliation of net earnings to net cash provided by (used in) operating activities (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Reconciliation of net earnings to net cash provided by (used in) operating activities
Net earnings	$ 489	$ 506
Adjustments to reconcile to net cash provided by (used in) operating activities:
Depreciation and amortization	110	120
Stock-based compensation	24	26
Excess tax benefits from stock-based compensation	(17)	(27)
Deferred income taxes	31	0
(Increase) decrease in assets:
Accounts receivable, net	(195)	(267)
Inventoried costs, net	(125)	60
Prepaid expenses and other assets	(9)	(119)
Increase (decrease) in liabilities:
Accounts payable and accruals	(560)	(635)
Income Taxes Payable	209	169
Retiree benefits	71	77
Other, net	(27)	(15)
Net cash provided by (used in) operating activities	$ 1	$ (105)

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