Acquisitions and Dispositions Divestitures (Details) $ in Millions		1 Months Ended				3 Months Ended								6 Months Ended		9 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 ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Dec. 31, 2017 USD ($) Segment	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Oct. 01, 2016 USD ($) employee
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales						$ 3,682	$ 3,776	$ 3,804	$ 3,486	$ 3,417	$ 3,660	$ 3,782	$ 3,411	$ 7,290		$ 11,066		$ 14,748	$ 14,270	$ 14,241
Net gains on the divestitures of businesses							0	25			0	0		25	$ 0	25	$ 0	25	46	0
Income tax expense						224	124	157	110	40	(220)	285	109	267		391		615	214	413
Income from discontinued operations, net of tax						151	610	496	337	340	(184)	370	347	833		1,443		1,594	873	1,406
Assets held for sale		$ 177				0	0	177	223	223				177		0		0	223
Liabilities held-for-sale		54				0	0	54	69	64				54		0		0	64
Pension settlement charge						$ 38	0	0	22	0	968	0	$ 0	22	0	22	968	60	968	0
Gain (loss) on sale of equity investments							$ 0	0	$ 0			20		25	20	$ 25	20	$ 25	39	0
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]
Gain (loss) on sale of equity investments					$ 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									1,000
Sales revenue, goods, net																			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]
Net sales							$ 50	84			285	282		167	543	$ 217	828	$ 217	908	1,089
Income from operations							5	12			38	43		21	71	26	109	30	111	137
Net gains on the divestitures of businesses							343				0					343	0	343	421	0
Income tax expense							131	4			11	12		8	21	139	32	140	202	42
Income from discontinued operations, net of tax							$ 217	$ 8			$ 27	$ 31		$ 13	$ 50	$ 230	$ 77	233	330	$ 95
Receivables. net										38									38
Inventory										32									32
Other current assets										1									1
Property, plant, and equipment, net										151									151
Deferred income taxes										30									30
Other non-current assets										1									1
Assets held for sale										193									193
Accounts payable and accrued liabilities										52									52
Long-term liabilities										12									12
Liabilities held-for-sale										$ 64									$ 64
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
Gain (loss) on sale of equity investments			$ 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																$ 25