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Gypsum Transportation Limited	9 Months Ended
Gypsum Transportation Limited	Sep. 30, 2017
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment Disclosure [Text Block]	Gypsum Transportation Limited We exited our shipping operations in the second quarter of 2015. In November 2015, we entered into a release and debt settlement agreement to recover a portion of our loss incurred when our former trading partner ceased performing under the contract. We recorded a recovery of receivable of $8 million in the first quarter of 2016, which is presented as $3 million within "Recovery of receivable", $1 million within "Interest income" and $4 million within "Other (expense) income, net" on our condensed consolidated statement of income.