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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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