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Accounts receivable from subscribers, distributors, recoverable taxes contractual assets and other, net (Tables)
 12 Months Ended
Dec. 31, 2020
Statement [line items]  
Summary of Analysis of Accounts Receivable by Component
 
a)
 
An analysis of accounts receivable by component at December 31, 2019 and 2020 is as follows:
 
 
  
At December 31,
 
 
  
2019
 
 
2020
 
Subscribers and distributors
  
 
Ps.184,260,099
 
 
 
Ps.
168,758,386
 
Telecommunications carriers for network interconnection and other services
  
 
5,079,763
 
 
 
4,914,094
 
Recoverable taxes
  
 
23,628,728
 
 
 
44,557,402
 
Sundry debtors
  
 
12,084,050
 
 
 
12,504,566
 
Contract assets
  
 
34,274,007
 
 
 
29,588,104
 
Impairment of trade receivables
  
 
(39,480,909
) 
 
 
(44,551,735
) 
 
  
 
 
 
 
 
 
 
Total net
  
 
Ps.219,845,738
 
 
 
Ps.
215,770,817
 
 
  
 
 
 
 
 
 
 
Non-current
 
subscribers, distributors and contractual assets
  
 
Ps.  15,139,442
 
 
 
Ps.
    7,792,863
 
 
  
 
 
 
 
 
 
 
Total current subscribers, distributors and contractual assets
  
 
Ps.204,706,296
 
 
 
Ps.
207,977,954
 
 
  
 
 
 
 
 
 
 
Schedule of Changes in Allowance for Expected Credit Losses
b) Changes in the impairment of trade receivables is as follows:
 
 
  
For the years ended December 31,
 
 
  
2018
 
  
2019
 
  
2020
 
Balance at beginning of year
  
 
Ps.(39,044,925
) 
  
 
Ps.(40,798,025
) 
  
 
Ps.(39,480,909
) 
Increases recorded in expenses
  
 
(19,535,707
) 
  
 
(16,346,395
) 
  
 
(19,112,635
) 
Adjustment on initial application of IFRS 9
  
 
(2,400,783
) 
  
 
—  
 
  
 
—  
 
Write-offs
  
 
15,497,254
 
  
 
17,839,957
 
  
 
11,953,227
 
Business combination
  
 
 
 
  
 
(3,265,490
) 
  
 
(2,066
) 
Translation effect
  
 
4,686,136
 
  
 
3,089,044
 
  
 
2,090,648
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Balance at end of year
  
 
Ps.(40,798,025
) 
  
 
Ps.(39,480,909
) 
  
 
Ps.(44,551,735
) 
 
  
 
 
 
  
 
 
 
  
 
 
 
Summary of Aging of Accounts Receivable
c) The following table shows the aging of accounts receivable at December 31, 2019 and 2020, for subscribers and distributors:
 
 
  
Past due
 
 
  
Total
 
  
Unbilled services

provided
 
  
a-30 days
 
  
31-60 days
 
  
61-90 days
 
  
Greater than

90 days
 
December 31, 2019
  
Ps.
184,260,099
 
  
Ps.
76,223,243
 
  
Ps.
46,083,644
 
  
Ps.
6,076,281
 
  
Ps.
4,121,929
 
  
Ps.
51,755,002
 
December 31, 2020
  
Ps.
168,758,386
 
  
Ps.
75,972,811
 
  
Ps.
37,439,995
 
  
Ps.
5,325,264
 
  
Ps.
3,313,835
 
  
Ps.
46,706,481
 
 
Summary of Accounts Receivable from Subscribers and Distributors Included in the Allowance for Doubtful Accounts
d) The following table shows the accounts receivable from subscribers and distributors included in the impairments of trade receivables, as of December 31, 2019 and 202
0
:
 
 
  
Total
 
  
1-90 days
 
  
Greater than

90 days
 
December 31, 2019
  
Ps.
39,480,909
 
  
Ps.
3,948,091
 
  
Ps.
35,532,818
 
December 31, 2020
  
Ps.
44,551,735
 
  
Ps.
4,455,174
 
  
Ps.
40,096,561
Summary of Analysis of Contract Assets and Liabilities
e) An analysis of contract assets and liabilities
 
at December 31, 2019 and 2020 is as follows:
 
 
  
2019
 
  
2020
 
Contract Assets:
  
   
  
   
Balance at the beginning of the year
  
Ps.
34,718,749
 
  
Ps.
34,274,007
 
Additions
  
 
34,877,851
 
  
 
27,242,031
 
Disposals
  
 
(2,658,641
) 
  
 
(1,397,714
) 
Business Combination
  
 
576,463
 
  
 
—  
 
Amortization
  
 
(30,501,315
) 
  
 
(29,002,995
) 
Translation effect
  
 
(2,739,100
) 
  
 
(1,527,225
) 
 
  
 
 
 
  
 
 
 
Balance at the end of the year
  
Ps.
34,274,007
 
  
Ps.
29,588,104
 
Non-current
 
contract assets
  
Ps.
1,786,560
 
  
Ps.
817,740
 
 
  
 
 
 
  
 
 
 
Current portion contracts assets
  
Ps.
32,487,447
 
  
Ps.
28,770,364