Supplemental Balance Sheet and Cash Flow Information - Supplemental Cash Flow Information (Details) - USD ($) $ in Millions				12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Change in Working Capital [Abstract]
Change in accounts receivable				$ (113)	$ (141)	$ (86)
Change in inventories				(110)	(146)	(13)
Change in accounts payable				97	234	70
Change in accrued payroll and employee benefits				(28)	53	5
Change in accrued income taxes				(3)	26	(13)
Change in other current assets and liabilities				44	(34)	(14)
Net				(113)	(8)	(51)
Supplemental Cash Flow Information [Abstract]
Cash and cash equivalents	$ 510	$ 603	$ 707	510	603	707	$ 791
Restricted cash included in other current assets	7	3	5	7	3	5	6
Restricted cash included in other noncurrent assets	3	4	4	3	4	4	3
Total cash, cash equivalents and restricted cash	520	610	716	520	610	716	$ 800
Interest paid				90	104	111
Income taxes paid				145	87	89
Purchases of property, plant and equipment held in accounts payable	$ 91	$ 86	$ 113
Noncash financing activity related to stock compensation plans				18	$ 17	$ 14
Noncash financing activity related to dividends in stock compensation plans				$ 1