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Revenue - Deferred Revenue (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($)
Less:
Balance at December 31, 2018	$ 69
Nitrogen Fertilizer Segment
Change in Contract with Customer, Liability [Roll Forward]
Balance at January 1, 2018	34
Add:
New prepay contracts entered into during the period, net of adjustments	92
Less:
Revenue recognized that was included in the contract liability balance at the beginning of the period	34
Revenue recognized related to contracts entered into during the period	23
Balance at December 31, 2018	$ 69

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- Definition

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+ References

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- Definition

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Contract With Customer, Liability, Increases During Period [Abstract]

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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 current.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130532-203044

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Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

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