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

Period covered by the long-term supply commitment, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

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- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as noncurrent.

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- Definition

Amount of revenue recognized from performance obligation satisfied or partially satisfied in previous reporting periods. Includes, but is not limited to, change in transaction price.

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