Goodwill and Identifiable Intangible Assets - Allocated by Reportable Segment (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2017	Dec. 31, 2016
Goodwill [Line Items]
Goodwill		$ 7,121	$ 7,002	[1]
Accumulated impairment losses		(442)	(442)
Balance		6,560
Business acquisitions	[2]	116
Business divestitures	[3]	(12)
Foreign currency translation adjustments	[4]	15
Balance		6,679
Electronic Systems [Member]
Goodwill [Line Items]
Goodwill		2,783	2,687	[1]
Accumulated impairment losses		(43)	(43)
Balance		2,644
Business acquisitions	[2]	100
Business divestitures	[3]	(12)
Foreign currency translation adjustments	[4]	8
Balance		2,740
Aerospace Systems [Member]
Goodwill [Line Items]
Goodwill		1,700	1,698	[1]
Accumulated impairment losses		(338)	(338)
Balance		1,360
Business acquisitions	[2]	0
Business divestitures	[3]	0
Foreign currency translation adjustments	[4]	2
Balance		1,362
Communication Systems [Member]
Goodwill [Line Items]
Goodwill		1,058	1,058	[1]
Accumulated impairment losses		(35)	(35)
Balance		1,023
Business acquisitions	[2]	0
Business divestitures	[3]	0
Foreign currency translation adjustments	[4]	0
Balance		1,023
Sensor Systems [Member]
Goodwill [Line Items]
Goodwill		1,580	1,559	[1]
Accumulated impairment losses		(26)	$ (26)
Balance		1,533
Business acquisitions	[2]	16
Business divestitures	[3]	0
Foreign currency translation adjustments	[4]	5
Balance		$ 1,554

[1] The business realignment in the Electronic Systems segment resulted in a reallocation of goodwill due to changes in reporting units. Goodwill was reallocated to the affected reporting units based upon their relative fair value. The changes to reporting units did not result in a goodwill impairment of any reporting unit.

[2] The increase for the Electronic Systems segment was due to the acquisition of the ETD business and the purchase price allocation adjustment for the MacH business acquisition. The increase for the Sensor Systems segment was primarily due to the OceanServer business acquisition.

[3] The decrease for the Electronic Systems segment was due to the divestitures of Coleman and Aviation Jet Services during the quarterly period ended March 31, 2017.

[4] The increase in the Electronic Systems segment was due to the weakening of the U.S. dollar against the British pound and the Canadian dollar during the quarterly period ended March 31, 2017. The increase in the Aerospace Systems segment was due to the weakening of the U.S. dollar against the Canadian dollar during the quarterly period ended March 31, 2017. The increase in the Sensor Systems segment was due to the weakening of the U.S. dollar against the Australian dollar, the Euro and the British pound during the quarterly period ended March 31, 2017.