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Segment Disclosures (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment reporting information
Net sales			$ 6,538	$ 4,124	$ 4,590
Long-lived and intangible asset impairment		$ 236	236	0	0
Goodwill impairment	$ 26	$ 259	285	0	0
Ammonia
Segment reporting information
Net sales			1,787	1,020	1,113
Goodwill impairment			9
Granular Urea
Segment reporting information
Net sales			1,880	1,248	1,342
Goodwill impairment			0
UAN
Segment reporting information
Net sales			1,788	1,063	1,270
Goodwill impairment			0
AN
Segment reporting information
Net sales			510	455	506
Goodwill impairment			241
Other
Segment reporting information
Goodwill impairment			35
Operating segments | Ammonia
Segment reporting information
Net sales			1,787	1,020	1,113
Operating segments | Granular Urea
Segment reporting information
Net sales			1,880	1,248	1,342
Operating segments | UAN
Segment reporting information
Net sales			1,788	1,063	1,270
Operating segments | AN
Segment reporting information
Net sales			510	455	506
Operating segments | Other
Segment reporting information
Net sales			$ 573	$ 338	$ 359

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