Supplemental Balance Sheet and Cash Flow Information - Supplemental Cash Flow Information (Details) - USD ($) $ in Millions				12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Change in Working Capital [Abstract]
Change in accounts receivable				$ (86)	$ 0	$ (32)
Change in inventories				(13)	(28)	(56)
Change in accounts payable				70	(22)	66
Change in accrued payroll and employee benefits				5	3	13
Change in accrued income taxes				(13)	(1)	(2)
Change in other current assets and liabilities				(14)	7	(28)
Net				(51)	(41)	(39)
Supplemental Cash Flow Information [Abstract]
Interest paid				111	96	122
Income taxes paid				89	90	116
Purchases of property, plant and equipment held in accounts payable	$ 113	$ 55	$ 48
Non-cash financing activity related to stock compensation plans				14	15	13
Conversion of preferred stock into common stock				0	0	372
Conversion of preferred dividends into common stock				$ 0	$ 0	$ 3