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Equity Method Investment-Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Equity method investments |  |  |  |
Obligation to purchase ammonia (as a percent) |  |  | 50.00% |
Operating equity method investments | Maximum | Property, plant and equipment |  |  |  |
Equity method investments |  |  |  |
Number of years that the increased basis for property, plant and equipment and identifiable intangibles will be amortized |  |  | 12 years |
Point Lisas Nitrogen Limited (PLNL) | Operating equity method investments |  |  |  |
Equity method investments |  |  |  |
Ownership interest (as a percent) | 50.00% |  | 50.00% |
Equity Method Investment | $ 92 |  | $ 92 |
Carrying value of investments in excess of the entity's share of the affiliates' book value | 40 |  | 40 |
Purchases of ammonia from PLNL | $ 30 | $ 14 | $ 93 | $ 37

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- Definition Difference between amount at which an investment accounted for under the equity method of accounting is carried (reported) on the balance sheet and amount of underlying equity in net assets the reporting Entity has in the investee. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
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