Discontinued Operations - Additional Information (Detail) - Fiber Optic Licensing Division [Member] - USD ($)		3 Months Ended
	Aug. 04, 2015	Sep. 30, 2015	Jun. 30, 2016	Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sales price of fiber optic licensing operations	$ 1,000,000,000
Net cash proceeds from sale of fiber optic licensing operations	$ 848,000,000
Gain on disposal of discontinued operations before taxes		$ 272,000,000
Tax amount from gain loss of disposal of discontinued operations		101,000,000
Gain on sale, Net of tax		$ 171,000,000
Assets of fiber optic licensing operations			$ 0	$ 0
Non-current liabilities of discontinued operations			$ 0	$ 0