Acquisitions, Divestitures, Intangible Assets And Goodwill (Intangible Assets) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010
Acquisitions Divestitures Intangible Assets And Goodwill [Line Items]
Gross Carrying Amount	$ 3,219		$ 3,287
Accumulated amortization	(1,406)		(1,295)
Net Carrying Amount	1,813		1,992
Impairment of Intangible Assets, Finite-lived	111
Contract And Program Intangible Assets [Member]
Acquisitions Divestitures Intangible Assets And Goodwill [Line Items]
Gross Carrying Amount	2,393	[1]	2,421	[1]
Accumulated amortization	(1,060)	[1]	(949)	[1]
Net Carrying Amount	1,333	[1]	1,472	[1]
Trade Names And Trademarks [Member]
Acquisitions Divestitures Intangible Assets And Goodwill [Line Items]
Gross Carrying Amount	477		483
Accumulated amortization	(70)		(58)
Net Carrying Amount	407		425
Technology And Software [Member]
Acquisitions Divestitures Intangible Assets And Goodwill [Line Items]
Gross Carrying Amount	175		176
Accumulated amortization	(110)		(94)
Net Carrying Amount	65		82
Other Intangible Assets [Member]
Acquisitions Divestitures Intangible Assets And Goodwill [Line Items]
Gross Carrying Amount	174		207
Accumulated amortization	(166)		(194)
Net Carrying Amount	$ 8		$ 13

[1] Consists of acquired backlog and probable follow-on work and related customer relationships. December 31, 2011 amount includes impact of $111 impairment of completions business intangible asset in our Aerospace group.