Valuation and Qualifying Accounts

12 Months Ended

Dec. 31, 2016

Valuation and Qualifying Accounts [Abstract]

Valuation and Qualifying Accounts

Valuation and Qualifying Accounts

(In millions)

Description	Balance at Beginning of Period		Charged to Costs and Expenses		Deductions		Balance at End of Period
Valuation account for accounts receivable:
Year ended December 31, 2016	$	6	$	—	$	3	$	3
Year ended December 31, 2015	1		5		—		6
Year ended December 31, 2014	—		1		—		1
Valuation account for inventories:
Year ended December 31, 2016	$	55	$	32	$	5	$	82
Year ended December 31, 2015	6		53		4		55
Year ended December 31, 2014	13		6		13		6
Valuation account for deferred tax assets:
Year ended December 31, 2016	$	48	$	18	$	19	$	47
Year ended December 31, 2015	57		5		14		48
Year ended December 31, 2014	—		57		—		57

See accompanying report of independent registered public accounting firm.