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Income Taxes (Details Textual) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011
Income Taxes (Textual) [Abstract]
Accounts payable as due	$ 450		$ 364
Income Taxes (Additional Textual) [Abstract]
Effective income tax rate	71.40%	37.10%
Income tax expense (benefit)	25	(13)
Portion of income tax receivable relates to contributions to the U.S. Salaried Retirement Plan	85
Income tax receivable	128
Exelis [Member]
Income Taxes (Textual) [Abstract]
Accounts payable as due	$ 85

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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- Definition

The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

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- Definition

Carrying amount as of the balance sheet date of income taxes previously overpaid to tax authorities (such as U.S. Federal, state and local tax authorities) representing refunds of overpayments or recoveries based on agreed-upon resolutions of disputes. Also called income tax refund receivable.

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