Condensed Combining Financial Information of L-3 Communications and Its Subsidiaries (Details) (USD $) In Millions	Sep. 30, 2011		Dec. 31, 2010	Sep. 24, 2010	Dec. 31, 2009
Current assets:
Cash and cash equivalents	$ 538	[1]	$ 607	$ 650	$ 1,016
Billed receivables, net	1,188	[1]	1,299
Contracts in process	2,783	[1]	2,548
Other current assets	636		624
Total current assets	5,145	[1]	5,078
Goodwill	8,735	[1]	8,730
Other assets	1,573		1,643
Investment in and amounts due from consolidated subsidiaries	0		0
Total assets	15,453	[1]	15,451
Current liabilities	2,740	[1]	2,733
Current portion of long-term debt	0	[1]	11
Other current liabilities			2,722
Amounts due to consolidated subsidiaries	0		0
Other long-term liabilities	1,800		1,737
Long-term debt	4,126	[1]	4,126
Total liabilities	8,666	[1]	8,596
L-3 shareholders' equity	6,696	[1]	6,764
Noncontrolling interests	91	[1]	91
Total equity	6,787	[1]	6,855	7,000	6,660
Total liabilities and equity	15,453	[1]	15,451
L-3 Holdings (Parent) [Member]
Current assets:
Cash and cash equivalents	0		0	0	0
Billed receivables, net	0		0
Contracts in process	0		0
Other current assets	0		0
Total current assets	0		0
Goodwill	0		0
Other assets	0		0
Investment in and amounts due from consolidated subsidiaries	7,385		7,462
Total assets	7,385		7,462
Current liabilities	0
Current portion of long-term debt			11
Other current liabilities			0
Amounts due to consolidated subsidiaries	0		0
Other long-term liabilities	0		0
Long-term debt	689		687
Total liabilities	689		698
L-3 shareholders' equity	6,696		6,764
Noncontrolling interests	0		0
Total equity	6,696		6,764
Total liabilities and equity	7,385		7,462
L-3 Communications [Member]
Current assets:
Cash and cash equivalents	113		257	247	797
Billed receivables, net	330		387
Contracts in process	917		801
Other current assets	303		295
Total current assets	1,663		1,740
Goodwill	1,806		1,796
Other assets	676		693
Investment in and amounts due from consolidated subsidiaries	9,000		8,973
Total assets	13,145		13,202
Current liabilities	856
Current portion of long-term debt			11
Other current liabilities			898
Amounts due to consolidated subsidiaries	0		0
Other long-term liabilities	1,467		1,403
Long-term debt	4,126		4,126
Total liabilities	6,449		6,438
L-3 shareholders' equity	6,696		6,764
Noncontrolling interests	0		0
Total equity	6,696		6,764
Total liabilities and equity	13,145		13,202
Guarantor Subsidiaries [Member]
Current assets:
Cash and cash equivalents	3		3	4	4
Billed receivables, net	632		680
Contracts in process	1,559		1,525
Other current assets	135		161
Total current assets	2,329		2,369
Goodwill	5,654		5,653
Other assets	709		763
Investment in and amounts due from consolidated subsidiaries	2,772		2,356
Total assets	11,464		11,141
Current liabilities	1,358
Current portion of long-term debt			0
Other current liabilities			1,388
Amounts due to consolidated subsidiaries	0		0
Other long-term liabilities	233		235
Long-term debt	0		0
Total liabilities	1,591		1,623
L-3 shareholders' equity	9,873		9,518
Noncontrolling interests	0		0
Total equity	9,873		9,518
Total liabilities and equity	11,464		11,141
Non-Guarantor Subsidiaries [Member]
Current assets:
Cash and cash equivalents	484		482	468	364
Billed receivables, net	226		232
Contracts in process	307		222
Other current assets	198		168
Total current assets	1,215		1,104
Goodwill	1,275		1,281
Other assets	188		187
Investment in and amounts due from consolidated subsidiaries	0		0
Total assets	2,678		2,572
Current liabilities	588
Current portion of long-term debt			0
Other current liabilities			571
Amounts due to consolidated subsidiaries	433		439
Other long-term liabilities	100		99
Long-term debt	0		0
Total liabilities	1,121		1,109
L-3 shareholders' equity	1,557		1,463
Noncontrolling interests	0		0
Total equity	1,557		1,463
Total liabilities and equity	2,678		2,572
Eliminations [Member]
Current assets:
Cash and cash equivalents	(62)		(135)	(69)	(149)
Billed receivables, net	0		0
Contracts in process	0		0
Other current assets	0		0
Total current assets	(62)		(135)
Goodwill	0		0
Other assets	0		0
Investment in and amounts due from consolidated subsidiaries	(19,157)		(18,791)
Total assets	(19,219)		(18,926)
Current liabilities	(62)
Current portion of long-term debt			(11)
Other current liabilities			(135)
Amounts due to consolidated subsidiaries	(433)		(439)
Other long-term liabilities	0		0
Long-term debt	(689)		(687)
Total liabilities	(1,184)		(1,272)
L-3 shareholders' equity	(18,126)		(17,745)
Noncontrolling interests	91		91
Total equity	(18,035)		(17,654)
Total liabilities and equity	$ (19,219)		$ (18,926)

[1] Unaudited