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Commitments, Contingencies and Guarantees (Details) $ in Millions	3 Months Ended
	Mar. 31, 2019 USD ($) item	Dec. 31, 2018 USD ($)	Dec. 31, 2016 USD ($)	May 31, 2016 USD ($)
Loss Contingency, Accrual, Current	$ 112	$ 113
Loss Contingency, Accrual, Noncurrent	278	279
Dow Corning Breast Implant Litigation [Member]
Payment of claims	1,800
Loss Contingency, Accrual	263			$ 290
Dow Corning Bankruptcy Pendency Interest Claims [Member]
Loss Contingency, Accrual	$ 83			$ 107
Indemnification of excess liability	50.00%
Amended Pittsburgh Corning Corporation Plan [Member] | Asbestos Litigation [Member]
Loss Contingency, Accrual	$ 185
Loss Contingency, Accrual, Current	50
Loss Contingency, Accrual, Noncurrent	$ 135
Pittsburgh Corning Corporation PCC [Member] | Asbestos Litigation [Member]
Equity Method Investment, Ownership Percentage			50.00%
Loss Contingency, Accrual			$ 290
Dow Corning Corporation [Member]
Equity Method Investment, Ownership Percentage	50.00%
Investment in affiliated companies, at equity	$ 4,800
Environmental Cleanup and Related Litigation [Member]
Number of Hazardous Waste Sites | item	15
Accrual for Environmental Loss Contingencies	$ 28	30
Non-PCC Asbestos Litigation [Member]
Loss Contingency, Accrual, Noncurrent	$ 146	$ 146

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