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Costs and Estimated Earnings on Uncompleted Contracts (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Costs and Estimated Earnings on Uncompleted Contracts
Costs incurred on uncompleted contracts	$ 5,868	$ 5,839
Estimated earnings	3,630	3,775
Costs and estimated earnings on uncompleted contracts, Gross	9,498	9,614
Less: Billings to date	9,653	9,886
Total net estimate billing on uncompleted contracts	(155)	(272)
Costs and estimated earnings in excess of billings on uncompleted contracts	810	593
Billings in excess of costs and estimated earnings on uncompleted contracts	$ (965)	$ (865)

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Liability attributable to (i) billings in excess of costs under the percentage of completion contract accounting method representing the difference between contractually invoiced amounts (billings) and revenue recognized based, for example, on costs incurred to estimated total costs at period end or (ii) contractually invoiced amounts (billings) in excess of costs incurred and accumulated under the completed contract accounting method.

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