Schedule II - Valuation and Qualifying Accounts and Reserves - Amounts Deducted From Assets in the Balance Sheets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accounts Receivable - Allowance for Doubtful Accounts [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	$ 6	$ 5	$ 6
Amounts charged or credited to income	2	2	1
Allowance utilized	0	0	(1)
Adjustments arising from change in currency exchange rates and other items	0	(1)	(1)
Balance at end of period	8	6	5
Inventory Reserves [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	51	46	48
Amounts charged or credited to income	10	19	18
Allowance utilized	(11)	(13)	(16)
Adjustments arising from change in currency exchange rates and other items	3	(1)	(4)
Balance at end of period	53	51	46
Deferred Tax Assets - Valuation Allowance [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	285	662	728
Amounts charged or credited to income	29	(483)	(49)
Allowance utilized	0	0	(1)
Adjustments arising from change in currency exchange rates and other items	(13)	106	(16)
Balance at end of period	$ 301	$ 285	$ 662