Acquisitions and Dispositions Divestitures (Details) $ in Millions		1 Months Ended				3 Months Ended								12 Months Ended
	Sep. 01, 2017 USD ($)	Jun. 30, 2017 USD ($)	Nov. 30, 2016 USD ($) Entity	Oct. 31, 2016 USD ($)	Apr. 30, 2016 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2018 USD ($) Segment	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Oct. 01, 2016 USD ($) employee
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash (used for)/from operating activities, discontinued operations														$ (20)	$ 17	$ 133
Net gains on the divestitures of businesses														0	25	39
Income tax expense														353	615	214
Income from discontinued operations, net of tax						$ 258	$ 378	$ 371	$ 334	$ 151	$ 610	$ 496	$ 337	1,341	1,594	873
Total Net sales						$ 3,645	$ 3,817	$ 4,131	$ 3,781	$ 3,682	$ 3,776	$ 3,804	$ 3,486	15,374	14,748	14,270
Pension settlement charge														$ 0	60	968
Number of reportable business segments | Segment														2
Pittsburgh Glass Works L L C
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Equity Method Investment, Realized Gain (Loss) on Disposal					$ 20
North American Fiber Glass Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net gains on the divestitures of businesses	$ 343
Estimated proceeds from sale of business	$ 541
Entity number of employees											1,000
Total Net sales															350
Flat Glass Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net gains on the divestitures of businesses				$ 421
Estimated proceeds from sale of business																	$ 740
Entity number of employees | employee																	1,200
Glass Segment
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax														$ 13
Cash (used for)/from operating activities, discontinued operations														20
Income from operations														21	30	111
Net gains on the divestitures of businesses														0	343	421
Income tax expense														5	140	202
Income from discontinued operations, net of tax														16	233	330
Total Net sales														$ 0	$ 217	$ 908
European Fiber Glass
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net gains on the divestitures of businesses				(42)
Pension settlement charge				$ 46
Fiber Glass Asian Joint Ventures
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Ownership interest			50.00%
Number of joint ventures disposed | Entity			2
Equity Method Investment, Realized Gain (Loss) on Disposal			$ 36
Mexican Plaka Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net gains on the divestitures of businesses		$ 25