Valuation and Qualifying Accounts (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Valuation account for accounts receivable:
Valuation Account for Accounts Receivable
Balance at Beginning of Period	$ 1	$ 0	$ 1
Charged to Costs and Expenses	5	1	0
Deductions / (Recoveries)	0	0	1
Balance at End of Period	6	1	0
Valuation accounts for inventories:
Valuation Account for Accounts Receivable
Balance at Beginning of Period	6	13	14
Charged to Costs and Expenses	53	6	8
Deductions / (Recoveries)	4	13	9
Balance at End of Period	55	6	13
Valuation accounts for deferred tax assets:
Valuation Account for Accounts Receivable
Balance at Beginning of Period	57	0	0
Charged to Costs and Expenses	5	57	0
Deductions / (Recoveries)	14	0	0
Balance at End of Period	$ 48	$ 57	$ 0