Acquisitions and Dispositions - Summarized Financial Information Related to Discontinued Operations (Details) - USD ($) $ in Millions	10 Months Ended	12 Months Ended
	Oct. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on sale of discontinued operations		$ 0	$ 0	$ 279
L&W Supply | Discontinued Operations, Held-for-sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales	$ 1,252
Cost of products sold	1,196
Gross profit	56
Selling and administrative expenses	22
Operating profit	34
Income tax expense	12
Net income from discontinued operations	22			$ 22
Gain on sale of discontinued operations	279
Transaction costs related to sale	$ 8