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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		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Change in Accounting Estimate [Line Items]
Operating Income	$ 769	$ 790	$ 2,434	$ 2,355
Diluted earnings per share	$ 2.26	$ 2.14	$ 7.28	$ 6.22
Contracts Accounted for under Percentage of Completion [Member]
Change in Accounting Estimate [Line Items]
Operating Income	$ 194	$ 236	$ 556	$ 657
Diluted earnings per share	$ 0.60	$ 0.66	$ 1.68	$ 1.80

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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