Business, Basis of Presentation and Significant Accounting Policies (Revenue Recognition) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Concentration Risk [Line Items]
Unapproved change orders, description	The Company may incur costs subject to change orders, whether approved or unapproved by the customer, and/or claims related to certain contracts. Management determines the probability that such costs will be recovered based upon engineering studies and legal opinions, past practices with the customer, specific discussions, correspondence or preliminary negotiations with the customer. The Company treats project costs as a cost of contract performance in the period incurred if it is not probable that the costs will be recovered, or defers costs and/or recognizes revenue up to the amount of the related cost if it is probable that the contract price will be adjusted and can be reliably estimated. As of December 31, 2014 and 2013, the Company had approximately $87 million and $79 million, respectively, of change orders and/or claims that had been included in contract price adjustments on certain contracts that were in the process of being resolved in the normal course of business, including through negotiation, arbitration and other proceedings. These contract price adjustments, which are included within costs and earnings in excess of billings or billed accounts receivable, as appropriate, represent management’s best estimate of contract revenue that has been or will be earned and that management believes is probable of collection.
Costs and Earnings in Excess of Billings [Member]
Concentration Risk [Line Items]
Unapproved change orders, expected to be billed and collected within one year, amount (in dollars)	$ 87	$ 79
Unbilled Revenues [Member]
Concentration Risk [Line Items]
Unapproved change orders, contract revenue recognized (in dollars)	$ 29	$ 43
Maximum [Member]
Concentration Risk [Line Items]
Fixed price contract, term within which generally completed (in years)	1 year
Change order approval process, period (in years)	1 year
Contracts Accounted for under Percentage of Completion [Member]
Concentration Risk [Line Items]
Change in accounting estimate, percentage of completion projects, financial effect, percentage	5.00%	5.00%
Revenue [Member] | Master Service and Other Service Agreements [Member] | Concentration Risk from Type of Arrangement [Member]
Concentration Risk [Line Items]
Concentration risk, percentage of total	49.00%	46.00%	43.00%