Goodwill and Other Intangible Assets (Details) $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($)
Goodwill [Roll Forward]
Balance at the beginning of the year	$ 2,345
Effect of exchange rate changes	26
Balance at the end of the year	2,371
Ammonia
Goodwill [Roll Forward]
Balance at the beginning of the year	585
Effect of exchange rate changes	2
Balance at the end of the year	587
Granular Urea
Goodwill [Roll Forward]
Balance at the beginning of the year	828
Effect of exchange rate changes	1
Balance at the end of the year	829
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	286
Effect of exchange rate changes	20
Balance at the end of the year	306
Other
Goodwill [Roll Forward]
Balance at the beginning of the year	70
Effect of exchange rate changes	3
Balance at the end of the year	$ 73