Consolidated Statements of Cash Flows Indirect Method (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Reconciliation of Net Earnings to Net Cash Provided by Operating Activities
Net earnings	$ 2,118	$ 2,053	$ 1,686
Net earnings from discontinued operations	(32)	(134)	(234)
Adjustments to reconcile to net cash provided by operating activities
Depreciation	462	446	429
Amortization of assets	82	109	121
Stock-based compensation	140	136	105
Excess tax benefits from stock-based compensation	(17)	(22)	(2)
Pre-tax gain on sale of businesses		(10)	(446)
Charge on debt redemption		229
(Increase) decrease in
Accounts receivable, net	350	(471)	345
Inventoried costs, net	(2)	(64)	(133)
Prepaid expenses and other current assets	16	36	(4)
Increase (decrease) in
Accounts payable and accruals	(341)	70	(133)
Deferred income taxes	441	89	204
Income taxes payable	(32)	(26)	65
Retiree benefits	(904)	(354)	60
Other, net	66	(31)	(68)
Cash provided by continuing operations	2,347	2,056	1,995
Cash (used in) provided by discontinued operations	(232)	397	138
Net cash provided by operating activities	2,115	2,453	2,133
Sale of businesses
Liabilities assumed by purchaser			$ 167

Income loss from discontinued operations net of tax shipbuilding.

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The aggregate amount of recurring noncash expense charged against earnings in the period to allocate the cost of assets over their estimated remaining economic lives.

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Reductions in the entity's income taxes that arise when compensation cost (from non-qualified equity-based compensation) recognized on the entity's tax return exceeds compensation cost from equity-based compensation recognized in financial statements. This element reduces net cash provided by operating activities.

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The increase (decrease) during the reporting period in the amount due to fund pension and non-pension benefits to employees, retired and disabled former employees.

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The net cash from (used in) the entity's continuing operations. This element specifically EXCLUDES the cash flows derived by the entity from its discontinued operations, if any. This element is only to be used when the entity reports its cash flows attributable to discontinued operations separately from the cash flow provided by or used in operating activities. While for technical reasons this element has no balance attribute, the default assumption is a debit balance consistent with its label.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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