Goodwill and Identifiable Intangible Assets - Allocated by Reportable Segment (Details) - USD ($) $ in Millions		6 Months Ended
		Jun. 30, 2017	Dec. 31, 2016
Goodwill [Line Items]
Goodwill		$ 7,181	$ 7,002	[1]
Accumulated impairment losses		(442)	(442)
Balance		6,560
Business acquisitions	[2]	138
Business divestitures	[3]	(12)
Foreign currency translation adjustments	[4]	53
Balance		6,739
Electronic Systems [Member]
Goodwill [Line Items]
Goodwill		2,804	2,687	[1]
Accumulated impairment losses		(43)	(43)
Balance		2,644
Business acquisitions	[2]	95
Business divestitures	[3]	(12)
Foreign currency translation adjustments	[4]	34
Balance		2,761
Aerospace Systems [Member]
Goodwill [Line Items]
Goodwill		1,705	1,698	[1]
Accumulated impairment losses		(338)	(338)
Balance		1,360
Business acquisitions	[2]	0
Business divestitures	[3]	0
Foreign currency translation adjustments	[4]	7
Balance		1,367
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		1,614	1,559	[1]
Accumulated impairment losses		(26)	$ (26)
Balance		1,533
Business acquisitions	[2]	43
Business divestitures	[3]	0
Foreign currency translation adjustments	[4]	12
Balance		$ 1,588

[1] The business realignment during the quarterly period ended March 31, 2017 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 adjustments for the MacH and Aerosim business acquisitions. The increase for the Sensor Systems segment was primarily due to the Open Water Power and OceanServer business acquisitions.

[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 first half period ended June 30, 2017. The increase in the Aerospace Systems segment was due to the weakening of the U.S. dollar against the Canadian dollar during the first half period ended June 30, 2017. The increase in the Sensor Systems segment was due to the weakening of the U.S. dollar against the Euro, the British pound and the Australian dollar during the first half period ended June 30, 2017.