SEGMENT AND RELATED INFORMATION (DETAILS) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended			3 Months Ended		6 Months Ended		3 Months Ended				6 Months Ended				3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended				6 Months Ended					3 Months Ended		6 Months Ended		3 Months Ended				6 Months Ended					3 Months Ended	6 Months Ended	3 Months Ended				6 Months Ended				3 Months Ended	6 Months Ended		12 Months Ended	3 Months Ended				6 Months Ended					3 Months Ended	6 Months Ended	3 Months Ended				6 Months Ended				3 Months Ended		6 Months Ended		12 Months Ended	3 Months Ended				6 Months Ended					6 Months Ended	3 Months Ended				6 Months Ended					3 Months Ended				6 Months Ended					3 Months Ended	6 Months Ended
	Jul. 04, 2014	Jun. 28, 2013	Jul. 04, 2014 segments	Jun. 28, 2013	Jan. 03, 2014	Jul. 04, 2014 US Army [Member]	Jun. 28, 2013 US Army [Member]	Jul. 04, 2014 US Army [Member]	Jun. 28, 2013 US Army [Member]	Jul. 04, 2014 US Army [Member] Sales [Member]		Jun. 28, 2013 US Army [Member] Sales [Member]		Jul. 04, 2014 US Army [Member] Sales [Member]		Jun. 28, 2013 US Army [Member] Sales [Member]		Jul. 04, 2014 DOE [Member]	Jun. 28, 2013 DOE [Member]	Jul. 04, 2014 DOE [Member]	Jun. 28, 2013 DOE [Member]	Jul. 04, 2014 DOE [Member] Sales [Member]	Jun. 28, 2013 DOE [Member] Sales [Member]	Jul. 04, 2014 DOE [Member] Sales [Member]	Jun. 28, 2013 DOE [Member] Sales [Member]	Jul. 04, 2014 Federal Market Sector [Member] Sales [Member]	Jun. 28, 2013 Federal Market Sector [Member] Sales [Member]	Jul. 04, 2014 Federal Market Sector [Member] Sales [Member]	Jun. 28, 2013 Federal Market Sector [Member] Sales [Member]	Jul. 04, 2014 Corporate [Member]		Jun. 28, 2013 Corporate [Member]		Jul. 04, 2014 Corporate [Member]		Jun. 28, 2013 Corporate [Member]		Jan. 03, 2014 Corporate [Member]	Jul. 04, 2014 Inter-segment Eliminations and Other [Member]	Jun. 28, 2013 Inter-segment Eliminations and Other [Member]	Jul. 04, 2014 Inter-segment Eliminations and Other [Member]	Jun. 28, 2013 Inter-segment Eliminations and Other [Member]	Jul. 04, 2014 Infrastructure and Environment [Member] Operating Segments [Member]		Jun. 28, 2013 Infrastructure and Environment [Member] Operating Segments [Member]		Jul. 04, 2014 Infrastructure and Environment [Member] Operating Segments [Member]		Jun. 28, 2013 Infrastructure and Environment [Member] Operating Segments [Member]		Jan. 03, 2014 Infrastructure and Environment [Member] Operating Segments [Member]	Jul. 04, 2014 Infrastructure and Environment [Member] Operating Segments [Member] Sales [Member]	Jul. 04, 2014 Infrastructure and Environment [Member] Operating Segments [Member] Sales [Member]	Jul. 04, 2014 Infrastructure and Environment [Member] Operating Segments [Member] US Army [Member]		Jun. 28, 2013 Infrastructure and Environment [Member] Operating Segments [Member] US Army [Member]		Jul. 04, 2014 Infrastructure and Environment [Member] Operating Segments [Member] US Army [Member]		Jun. 28, 2013 Infrastructure and Environment [Member] Operating Segments [Member] US Army [Member]		Jun. 28, 2013 Infrastructure and Environment [Member] Operating Segments [Member] DOE [Member]	Jul. 04, 2014 Infrastructure and Environment [Member] Operating Segments [Member] DOE [Member]	Jun. 28, 2013 Infrastructure and Environment [Member] Operating Segments [Member] DOE [Member]	Jan. 03, 2014 Federal Services [Member]	Jul. 04, 2014 Federal Services [Member] Operating Segments [Member]		Jun. 28, 2013 Federal Services [Member] Operating Segments [Member]		Jul. 04, 2014 Federal Services [Member] Operating Segments [Member]		Jun. 28, 2013 Federal Services [Member] Operating Segments [Member]		Jan. 03, 2014 Federal Services [Member] Operating Segments [Member]	Jul. 04, 2014 Federal Services [Member] Operating Segments [Member] Sales [Member]	Jul. 04, 2014 Federal Services [Member] Operating Segments [Member] Sales [Member]	Jul. 04, 2014 Federal Services [Member] Operating Segments [Member] US Army [Member]		Jun. 28, 2013 Federal Services [Member] Operating Segments [Member] US Army [Member]		Jul. 04, 2014 Federal Services [Member] Operating Segments [Member] US Army [Member]		Jun. 28, 2013 Federal Services [Member] Operating Segments [Member] US Army [Member]		Jul. 04, 2014 Federal Services [Member] Operating Segments [Member] DOE [Member]	Jun. 28, 2013 Federal Services [Member] Operating Segments [Member] DOE [Member]	Jul. 04, 2014 Federal Services [Member] Operating Segments [Member] DOE [Member]	Jun. 28, 2013 Federal Services [Member] Operating Segments [Member] DOE [Member]	Jan. 03, 2014 Energy and Construction [Member]	Jul. 04, 2014 Energy and Construction [Member] Operating Segments [Member]		Jun. 28, 2013 Energy and Construction [Member] Operating Segments [Member]		Jul. 04, 2014 Energy and Construction [Member] Operating Segments [Member]		Jun. 28, 2013 Energy and Construction [Member] Operating Segments [Member]		Jan. 03, 2014 Energy and Construction [Member] Operating Segments [Member]	Jul. 04, 2014 Energy and Construction [Member] Operating Segments [Member] Sales [Member]	Jul. 04, 2014 Energy and Construction [Member] Operating Segments [Member] US Army [Member]		Jun. 28, 2013 Energy and Construction [Member] Operating Segments [Member] US Army [Member]		Jul. 04, 2014 Energy and Construction [Member] Operating Segments [Member] US Army [Member]		Jun. 28, 2013 Energy and Construction [Member] Operating Segments [Member] US Army [Member]		Jul. 04, 2014 Energy and Construction [Member] Operating Segments [Member] DOE [Member]	Jul. 04, 2014 Oil and Gas [Member] Operating Segments [Member]		Jun. 28, 2013 Oil and Gas [Member] Operating Segments [Member]		Jul. 04, 2014 Oil and Gas [Member] Operating Segments [Member]		Jun. 28, 2013 Oil and Gas [Member] Operating Segments [Member]		Jan. 03, 2014 Oil and Gas [Member] Operating Segments [Member]	Jul. 04, 2014 Oil and Gas [Member] Operating Segments [Member] Sales [Member]	Jul. 04, 2014 Oil and Gas [Member] Operating Segments [Member] Sales [Member]
Segment additional assets information [Abstract]
Investments in and advances to unconsolidated joint ventures	$ 244		$ 244		$ 245																																						$ 7				$ 7				$ 8															$ 98				$ 98				$ 95																$ 20				$ 20				$ 21											$ 119				$ 119				$ 121
Property and equipment, net	592		592		608																									29				29				29					149				149				136															38				38				39																48				48				53											328				328				351
Total assets	8,655		8,655		8,718																									166				166				257					2,180				2,180				2,119															2,684				2,684				2,728																2,146				2,146				2,118											1,479				1,479				1,496
Goodwill (Textuals) [Abstract]
Inter-segment transfer																																																																	566																								(566)
Segment additional income statement information [Abstract]
Revenues	2,555	2,792	5,092	5,595		295	314	541	760									225	213	412	424																		(22)	(45)	(42)	(93)	824		947		1,674		1,845			824	1,674	34	[1]	32	[1]	67	[1]	65	[1]	1	1	2		728		790		1,377		1,697				1,377	203	[1]	254	[1]	378	[1]	643	[1]	225	212	410	422		562		641		1,106		1,179			1,106	58	[1]	28	[1]	96	[1]	52	[1]	1	463		459		977		967			463	977
Equity in income (loss) of unconsolidated joint ventures	17	18	36	42																																											1		1				1													16		15		35		36				35														1		2		2		4			2												1		(2)		1				(2)
URS operating income (loss)	118	130	193	268																										(27)	[2]	(23)	[2]	(49)	[2]	(46)	[2]						52	[3]	60	[3]	87	[3]	99	[3]			87													79	[3]	76	[3]	126	[3]	180	[3]		79	126														12	[3]	19	[3]	16	[3]	27	[3]		16										2	[3]	(2)	[3]	13	[3]	8	[3]		2	13
Operating income (loss)	138	145	225	298																										(27)	[2]	(23)	[2]	(49)	[2]	(46)	[2]						52		60		87		100				87													95		89		152		204			95	152														16		21		22		33			22										2		(2)		13		7			2	13
Depreciation and amortization	60	66	120	134																										3		2		5		4							13		12		25		25				25													11		11		22		22				22														10		11		19		22			19										23		30		49		61				49
Segment reporting disclosure of entity's reportable segments revenues by major customers [Abstract]
Percentage of revenues from major customers										12.00%	[1]	11.00%	[1]	11.00%	[1]	14.00%	[1]					9.00%	8.00%	8.00%	8.00%	32.00%	34.00%	31.00%	36.00%
Revenues	$ 2,555	$ 2,792	$ 5,092	$ 5,595		$ 295	$ 314	$ 541	$ 760									$ 225	$ 213	$ 412	$ 424																		$ (22)	$ (45)	$ (42)	$ (93)	$ 824		$ 947		$ 1,674		$ 1,845			$ 824	$ 1,674	$ 34	[1]	$ 32	[1]	$ 67	[1]	$ 65	[1]	$ 1	$ 1	$ 2		$ 728		$ 790		$ 1,377		$ 1,697				$ 1,377	$ 203	[1]	$ 254	[1]	$ 378	[1]	$ 643	[1]	$ 225	$ 212	$ 410	$ 422		$ 562		$ 641		$ 1,106		$ 1,179			$ 1,106	$ 58	[1]	$ 28	[1]	$ 96	[1]	$ 52	[1]	$ 1	$ 463		$ 459		$ 977		$ 967			$ 463	$ 977
Segment reporting disclosure (Textuals) [Abstract]
Number of operating segments			4
Description of reportable segments			Our Infrastructure & Environment Division provides program management, planning, design, engineering, construction and construction management, operations and maintenance, and decommissioning and closure services to the U.S. federal government, state and local government agencies, and private sector clients in the U.S. and internationally. Our Federal Services Division provides services to a wide variety of U.S. federal government agencies, as well as to national governments in other countries. This includes program management, planning, design, engineering, systems engineering and technical assistance, construction and construction management, operations and maintenance, management and operations, IT, and decommissioning and closure services. Our Energy & Construction Division provides program management, planning, design, engineering, construction and construction management, operations and maintenance, and decommissioning and closure services to private sector clients as well as federal, state, and local government agencies. Our Oil & Gas Division provides services to oil and gas industry clients throughout the U.S. and Canada. This includes oilfield services, such as rig transportation and fluid hauling; oil and gas production services, including mechanical, electrical and instrumentation services; pipeline and facility construction; engineering; and maintenance services.

[1] The U.S. Army includes U.S. Army Corps of Engineers.

[2] Corporate includes expenses related to corporate functions and acquisition-related expenses.

[3] We are providing information regarding URS operating income (loss) by segment because management uses this information to assess performance and make decisions about resource allocation. URS operating income is defined as segment operating income after reductions for pre-tax noncontrolling interests.