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Commitments, Contingencies and Guarantees (Narrative) (Details) $ in Millions | 1 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) item | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Aug. 25, 2016 USD ($) | May 31, 2016 USD ($)
Loss Contingency, Accrual, Current |  |  | $ 148 | $ 41 |  |  |
Loss Contingency, Accrual, Noncurrent |  |  | 279 | 338 |  |  |
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 |  |  | $ 81 |  |  |  | $ 107
Indemnification of excess liability |  |  | 50.00% |  |  |  |
Amended Pittsburgh Corning Corporation Plan [Member] | Asbestos Litigation [Member] |  |  |  |  |  |  |
Payment of claims | $ 35 | $ 70 |  |  |  |  |
Loss Contingency, Accrual |  |  | $ 185 |  | $ 290 |  |
Loss Contingency, Accrual, Current |  |  | 50 |  |  |  |
Loss Contingency, Accrual, Noncurrent |  |  | $ 135 |  |  |  |
Pittsburgh Corning Corporation PCC [Member] |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  | 50.00% |  |  |  |
Pittsburgh Corning Corporation PCC [Member] | PPG Industries, Inc. [Member] |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  | 50.00% |  |  |  |
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 |  |  | $ 33 | 38 |  |  |
Non-PCC Asbestos Litigation [Member] | Asbestos Litigation [Member] |  |  |  |  |  |  |
Loss Contingency, Accrual, Noncurrent |  |  | $ 147 | $ 147 |  | $ 150 |
Undiscounted Projection of Claims and Related Legal Fees Period |  |  | 20 years |  |  |  |
Minimum [Member] | Dow Corning Bankruptcy Pendency Interest Claims [Member] |  |  |  |  |  |  |
Loss Contingency, Estimate of Possible Loss |  |  | $ 81 |  |  |  |
Maximum [Member] | Dow Corning Bankruptcy Pendency Interest Claims [Member] |  |  |  |  |  |  |
Loss Contingency, Estimate of Possible Loss |  |  | $ 260 |  |  |  |

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