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Costs and Estimated Earnings on Uncompleted Contracts (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Costs and Estimated Earnings on Uncompleted Contracts
Costs incurred on uncompleted contracts	$ 5,839	$ 6,676
Estimated earnings	3,775	4,665
Costs and estimated earnings on uncompleted contracts, Gross	9,614	11,341
Less: Billings to date	9,886	11,037
Total net estimate billing on uncompleted contracts	(272)	304
Costs and estimated earnings in excess of billings on uncompleted contracts	593	815
Billings in excess of costs and estimated earnings on uncompleted contracts	$ (865)	$ (511)

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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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