Segment Information - Summary of Segment Information (Parenthetical) (Detail) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Non-cash goodwill impairment charges	$ 455		$ 384	$ 0	$ 0
Aerospace Systems [Member]
Segment Reporting Information [Line Items]
Non-cash goodwill impairment charges			338
Logistics Solutions [Member]
Segment Reporting Information [Line Items]
Non-cash goodwill impairment charges			338
Logistics Solutions [Member] | Continuing Operations [Member]
Segment Reporting Information [Line Items]
Non-cash goodwill impairment charges			338
Logistics Solutions [Member] | Aerospace Systems [Member]
Segment Reporting Information [Line Items]
Non-cash goodwill impairment charges	338		338
NSS [Member]
Segment Reporting Information [Line Items]
Non-cash goodwill impairment charges	117	$ 491	608
NSS [Member] | Continuing Operations [Member]
Segment Reporting Information [Line Items]
Non-cash goodwill impairment charges	$ 9		37
Business Retained from NSS [Member] | Continuing Operations [Member]
Segment Reporting Information [Line Items]
Non-cash goodwill impairment charges			9
NSS including Business Retained [Member] | Continuing Operations [Member]
Segment Reporting Information [Line Items]
Non-cash goodwill impairment charges			$ 46