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Trade Notes and Accounts Receivable, Net (Tables)

12 Months Ended

Dec. 31, 2017

Trade Notes and Accounts Receivable, Net

Schedule of trade notes and accounts receivables, net

		2017			2016
Non-interest bearing notes received from customers as deposits and advances mainly in connection with annual (“upfront basis”) and from time to time (“scatter basis”) prepayments (see Note 2 (o))		Ps.	17,309,800		Ps.	18,716,562
Trade accounts receivable		11,074,352			10,056,382
Allowance for doubtful accounts		(3,657,079		)	(3,866,492		)

		Ps.	24,727,073		Ps.	24,906,452

Schedule of aging analysis of current trade receivables past due

		2017			2016
1 to 90 days		Ps.	3,830,620		Ps.	5,421,772
91 to 180 days		1,019,717			1,303,596
More than 180 days		4,295,611			3,233,269

Schedule of carrying amount of trade notes and accounts receivable in foreign currencies

		2017			2016
U.S. dollar		Ps.	2,103,300		Ps.	3,508,188
Other currencies		210,621			325,116

At December 31		Ps.	2,313,921		Ps.	3,833,304

Schedule of changes in allowance for doubtful accounts of trade notes and account receivables

		2017			2016
At January 1		Ps.	(3,866,492	)	Ps.	(3,679,505	)
Impairment provision		(2,007,316		)	(2,461,596		)
Write-off of receivables		1,331,319			1,440,582
Unused amounts reversed		885,410			834,027

At December 31		Ps.	(3,657,079	)	Ps.	(3,866,492	)