Divestitures and Acquisitions - Schedule of Major Classes of Assets and Liabilities Included in Discontinued Operations (Detail) - USD ($) $ in Millions	Sep. 23, 2016	Dec. 31, 2015
Assets
Current assets		$ 664
Liabilities
Current liabilities		220
NSS [Member] | Discontinued Operations, Held-for-sale [Member]
Assets
Current assets		201
Property, plant and equipment, net		25
Goodwill		390
Other assets		48
Total assets of discontinued operations		664
Liabilities
Accounts payable, trade		48
Other current liabilities		78
Current liabilities		126
Long-term liabilities		94
Total liabilities of discontinued operations		$ 220