Valuation and Qualifying Accounts (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Valuation account for accounts receivable:
Valuation Account for Accounts Receivable
Balance at Beginning of Period	$ 6	$ 1	$ 0
Charged to Costs and Expenses	0	5	1
Deductions	3	0	0
Balance at End of Period	3	6	1
Valuation account for inventories:
Valuation Account for Accounts Receivable
Balance at Beginning of Period	55	6	13
Charged to Costs and Expenses	32	53	6
Deductions	5	4	13
Balance at End of Period	82	55	6
Valuation account for deferred tax assets:
Valuation Account for Accounts Receivable
Balance at Beginning of Period	48	57	0
Charged to Costs and Expenses	18	5	57
Deductions	19	14	0
Balance at End of Period	$ 47	$ 48	$ 57