Operations by Business Segment and Geographical Area (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Operating information by segment
Total revenue	$ 6,684,216,000	$ 7,136,056,000	$ 21,060,168,000	$ 20,554,413,000
Oil and Gas Segment
Operating information by segment
Total revenue	2,892,700,000	2,551,600,000	8,518,500,000	6,887,400,000
Industrial and Infrastructure Segment
Operating information by segment
Total revenue	2,665,000,000	3,465,000,000	8,879,500,000	10,102,000,000
Government Segment
Operating information by segment
Total revenue	675,200,000	790,100,000	2,101,000,000	2,511,500,000
Global Services Segment
Operating information by segment
Total revenue	149,700,000	159,500,000	454,000,000	503,000,000
Power Segment
Operating information by segment
Total revenue	301,600,000	169,900,000	1,107,200,000	550,500,000
Intercompany | Global Services Segment
Operating information by segment
Total revenue	128,000,000	116,000,000	371,100,000	341,800,000
Reportable segments
Operating information by segment
Total segment profit (loss)	310,600,000	278,300,000	892,200,000	818,300,000
Reportable segments | Oil and Gas Segment
Operating information by segment
Total segment profit (loss)	108,300,000	87,200,000	319,600,000	244,700,000
Reportable segments | Industrial and Infrastructure Segment
Operating information by segment
Total segment profit (loss)	132,400,000	145,000,000	388,700,000	389,600,000
Reportable segments | Government Segment
Operating information by segment
Total segment profit (loss)	37,800,000	22,900,000	92,700,000	98,100,000
Reportable segments | Global Services Segment
Operating information by segment
Total segment profit (loss)	24,500,000	29,200,000	79,800,000	100,400,000
Reportable segments | Power Segment
Operating information by segment
Total segment profit (loss)	7,600,000	(6,000,000)	11,400,000	(14,500,000)
Research and development expense	$ 12,700,000	$ 15,700,000	$ 41,100,000	$ 40,600,000