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Other Income (Expense), Net (Notes)	12 Months Ended
Other Income (Expense), Net (Notes)	Dec. 31, 2017
Other Income and Expenses [Abstract]
Other Income (Expense), Net	Other Income (Expense), Net Other income, net for 2017 included net foreign currency transaction gains ($8 million), interest income ($8 million) and equity income from investments in ammonia plants in Trinidad ($3 million), partially offset by an upward adjustment to deferred compensation expense ($(6) million). Other expense, net for 2016 included net foreign currency transaction losses ($(41) million) and an upward adjustment to deferred compensation expense ($(11) million), partially offset by equity income from investments in ammonia plants in Trinidad ($4 million). Other income, net, for 2015 included equity income from investments in ammonia plants in Trinidad ($9 million), a downward adjustment to deferred compensation expense ($6 million), interest income ($3 million) and net foreign currency transaction losses ($(17) million).