Business Group Information - Segment Reporting Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Segment Reporting Information [Line Items]
Revenues	$ 30,852		$ 30,930		$ 30,992
Operating earnings	3,889		3,689		765
Identifiable Assets	35,355		35,494		34,309
Capital Expenditures	521		436		436
Depreciation and Amortization	496		525		590
U S Government
Segment Reporting Information [Line Items]
Revenues	17,955		19,263		20,805
Aerospace
Segment Reporting Information [Line Items]
Revenues	8,649		8,118		6,912
Operating earnings	1,611		1,416		858
Identifiable Assets	8,245		8,005		7,524
Capital Expenditures	227		250		204
Depreciation and Amortization	137		123		125
Aerospace | U S Government
Segment Reporting Information [Line Items]
Revenues	99		98		160
Combat Systems
Segment Reporting Information [Line Items]
Revenues	5,732		5,832		7,471
Operating earnings	862		908		595
Identifiable Assets	9,487		9,002		9,185
Capital Expenditures	46		50		73
Depreciation and Amortization	100		113		143
Combat Systems | U S Government
Segment Reporting Information [Line Items]
Revenues	2,970		4,057		5,699
Marine Systems
Segment Reporting Information [Line Items]
Revenues	7,312		6,712		6,592
Operating earnings	703		666		750
Identifiable Assets	3,110		3,088		3,032
Capital Expenditures	124		83		85
Depreciation and Amortization	106		103		95
Marine Systems | U S Government
Segment Reporting Information [Line Items]
Revenues	6,901		6,536		6,504
Information Systems and Technology
Segment Reporting Information [Line Items]
Revenues	9,159	[1]	10,268	[1]	10,017	[1]
Operating earnings	785	[1]	795	[1]	(1,369)	[1]
Identifiable Assets	9,064		9,432		9,701
Capital Expenditures	54		52		72
Depreciation and Amortization	146		178		220
Information Systems and Technology | U S Government
Segment Reporting Information [Line Items]
Revenues	7,985	[1]	8,572	[1]	8,442	[1]
Corporate
Segment Reporting Information [Line Items]
Revenues	0	[2]	0	[2]	0	[2]
Operating earnings	(72)	[2]	(96)	[2]	(69)	[2]
Identifiable Assets	5,449	[2]	5,967	[2]	4,867	[2]
Capital Expenditures	70	[2]	1	[2]	2	[2]
Depreciation and Amortization	7	[2]	8	[2]	7	[2]
Corporate | U S Government
Segment Reporting Information [Line Items]
Revenues	$ 0	[2]	$ 0	[2]	$ 0	[2]

[1] Operating earnings in 2012 in our Information Systems and Technology group include $2.1 billion of goodwill and intangible asset impairment charges (see Note B for further discussion).

[2] Corporate operating results consist primarily of stock option expense. Corporate identifiable assets are primarily cash and equivalents.