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Basis of Presentation (Unaudited) Basis of Presentation (Unaudited) (Details 2) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Change in Accounting Estimate [Line Items]
Operating Income	$ 780us-gaap_OperatingIncomeLoss	$ 845us-gaap_OperatingIncomeLoss
Net earnings	484us-gaap_NetIncomeLoss	579us-gaap_NetIncomeLoss
Diluted earnings per share	$ 2.41us-gaap_EarningsPerShareDiluted	$ 2.63us-gaap_EarningsPerShareDiluted
Contracts Accounted for under Percentage of Completion [Member]
Change in Accounting Estimate [Line Items]
Operating Income	187	197
Net earnings	$ 122	$ 128
Diluted earnings per share	$ 0.61	$ 0.58

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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- Definition

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

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