Acquisitions and Divestitures Divestitures (Details) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2018 USD ($) Segment	Mar. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income tax expense	$ 87	$ 110	$ 110
Income from discontinued operations, net of tax	$ 6	6	$ 6
Number of Reportable Segments | Segment	2
Glass Segment [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales		83
Income from operations		8
Income tax expense		2
Income from discontinued operations, net of tax		$ 6