Goodwill and Other Intangible Assets (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($)
Goodwill [Roll Forward]
Balance at the beginning of the year	$ 2,371
Effect of exchange rate changes	(18)
Balance at the end of the year	2,353
Ammonia
Goodwill [Roll Forward]
Balance at the beginning of the year	587
Effect of exchange rate changes	(1)
Balance at the end of the year	586
Granular Urea
Goodwill [Roll Forward]
Balance at the beginning of the year	829
Effect of exchange rate changes	(1)
Balance at the end of the year	828
UAN
Goodwill [Roll Forward]
Balance at the beginning of the year	576
Effect of exchange rate changes	0
Balance at the end of the year	576
AN
Goodwill [Roll Forward]
Balance at the beginning of the year	306
Effect of exchange rate changes	(14)
Balance at the end of the year	292
Other
Goodwill [Roll Forward]
Balance at the beginning of the year	73
Effect of exchange rate changes	(2)
Balance at the end of the year	$ 71