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Revenue (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Customer deposits | $ 922 | $ 382 |
Credit memoranda issued | $ 0 | 0 |
Customer Concentration Risk [Member] | Display Technologies And Specialty Materials [Member] | Sales Revenue, Net [Member] |  |  |
Concentration risk, percentage |  |  | 11.00%
Maximum [Member] |  |  |
Long-term supply commitment | 10 years |  |
Accounting Standards Update 2014-09 [Member] |  |  |
Customer deposits | $ 1,000 | $ 400 |

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