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Equity Method Investments And Variable Interest Entities Equity Method Investments and Variable Interest Entities (Related Party Disclosures) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Schedule of Related Party Transactions Included In Our Consolidated Balance Sheets [Line Items]
Costs in Excess of Billings, Current	$ 425	$ 490
Transactions with Related Parties [Member]
Schedule of Related Party Transactions Included In Our Consolidated Balance Sheets [Line Items]
Due from Related Parties, Current	4	7
Costs in Excess of Billings, Current	2	2
Billings in Excess of Cost	$ 32	$ 21

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 that are expected to be realized within one year or one operating cycle, whichever is longer, from the reporting date.

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