Condensed Consolidating Financial Statements (Condensed Consolidating Balance Sheet) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009	Dec. 31, 2008
Current assets:
Cash and equivalents	$ 2,649		$ 2,613		$ 2,263	$ 1,621
Accounts receivable	4,452		3,848
Contracts in process	5,168		4,873
Inventories
Work in process	1,202		1,124
Raw materials	1,031		965
Finished goods	77		69
Other current assets	789		694
Total current assets	15,368		14,186
Noncurrent assets:
Property, plant and equipment	6,518	[1]	5,959	[1]
Accumulated depreciation of PP&E	(3,234)		(2,988)
Intangible assets	3,219		3,287
Accumulated amortization of intangible assets	(1,406)		(1,295)
Goodwill	13,576		12,649		12,269
Other assets	842		747
Total noncurrent assets	19,515		18,359
Total assets	34,883		32,545		31,077
Current liabilities:
Short-term debt	23		773
Customer advances and deposits	5,011		4,465
Other current liabilities	6,111		5,939
Total current liabilities	11,145		11,177
Noncurrent liabilities:
Long-term debt	3,907		2,430
Other liabilities	6,599		5,622
Total noncurrent liabilities	10,506		8,052
Shareholders' equity:
Common stock	482		482
Other shareholders' equity	12,750		12,834
Total shareholders' equity	13,232		13,316		12,423	10,053
Total liabilities and shareholders' equity	34,883		32,545
Parent [Member]
Current assets:
Cash and equivalents	1,530		1,608		1,406	746
Contracts in process	292		263
Inventories
Other current assets	319		143
Total current assets	2,141		2,014
Noncurrent assets:
Property, plant and equipment	153		147
Accumulated depreciation of PP&E	(49)		(42)
Other assets	265		183
Investment in subsidiaries	33,192		30,580
Total noncurrent assets	33,561		30,868
Total assets	35,702		32,882
Current liabilities:
Short-term debt			749
Other current liabilities	463		596
Total current liabilities	463		1,345
Noncurrent liabilities:
Long-term debt	3,895		2,396
Other liabilities	3,443		2,774
Total noncurrent liabilities	7,338		5,170
Intercompany	14,669		13,051
Shareholders' equity:
Common stock	482		482
Other shareholders' equity	12,750		12,834
Total shareholders' equity	13,232		13,316
Total liabilities and shareholders' equity	35,702		32,882
Guarantors On A Combined Basis [Member]
Current assets:
Accounts receivable	1,659		1,538
Contracts in process	3,182		3,205
Inventories
Work in process	1,168		1,090
Raw materials	898		808
Finished goods	36		36
Other current assets	247		147
Total current assets	7,190		6,824
Noncurrent assets:
Property, plant and equipment	5,181		4,687
Accumulated depreciation of PP&E	(2,604)		(2,448)
Intangible assets	1,767		1,664
Accumulated amortization of intangible assets	(976)		(920)
Goodwill	9,287		8,322
Other assets	247		172
Total noncurrent assets	12,902		11,477
Total assets	20,092		18,301
Current liabilities:
Short-term debt	21		21
Customer advances and deposits	2,483		2,182
Other current liabilities	3,729		3,397
Total current liabilities	6,233		5,600
Noncurrent liabilities:
Long-term debt	9		29
Other liabilities	2,541		2,242
Total noncurrent liabilities	2,550		2,271
Intercompany	(15,240)		(13,626)
Shareholders' equity:
Common stock	6		6
Other shareholders' equity	26,543		24,050
Total shareholders' equity	26,549		24,056
Total liabilities and shareholders' equity	20,092		18,301
Other Subsidiaries On A Combined Basis [Member]
Current assets:
Cash and equivalents	1,119		1,005		857	875
Accounts receivable	2,793		2,310
Contracts in process	1,694		1,405
Inventories
Work in process	34		34
Raw materials	133		157
Finished goods	41		33
Other current assets	223		404
Total current assets	6,037		5,348
Noncurrent assets:
Property, plant and equipment	1,184		1,125
Accumulated depreciation of PP&E	(581)		(498)
Intangible assets	1,452		1,623
Accumulated amortization of intangible assets	(430)		(375)
Goodwill	4,289		4,327
Other assets	330		392
Total noncurrent assets	6,244		6,594
Total assets	12,281		11,942
Current liabilities:
Short-term debt	2		3
Customer advances and deposits	2,528		2,283
Other current liabilities	1,919		1,946
Total current liabilities	4,449		4,232
Noncurrent liabilities:
Long-term debt	3		5
Other liabilities	615		606
Total noncurrent liabilities	618		611
Intercompany	571		575
Shareholders' equity:
Common stock	44		44
Other shareholders' equity	6,599		6,480
Total shareholders' equity	6,643		6,524
Total liabilities and shareholders' equity	12,281		11,942
Consolidating Adjustments [Member]
Noncurrent assets:
Investment in subsidiaries	(33,192)		(30,580)
Total noncurrent assets	(33,192)		(30,580)
Total assets	(33,192)		(30,580)
Shareholders' equity:
Common stock	(50)		(50)
Other shareholders' equity	(33,142)		(30,530)
Total shareholders' equity	(33,192)		(30,580)
Total liabilities and shareholders' equity	$ (33,192)		$ (30,580)

[1] Our government customers provide certain facilities; we do not include these facilities above.