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Accounting Policies - Cash and Cash Equivalents and Temporary Investments (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
U.S. dollar
Cash and Cash Equivalents and Temporary Investments
Average yield for cash equivalents and temporary investments	2.20%	1.77%
Mexican peso
Cash and Cash Equivalents and Temporary Investments
Average yield for cash equivalents and temporary investments	8.09%	7.69%

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The average yield for cash equivalents and temporary investments.

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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

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