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Accounts receivable from subscribers, distributors, recoverable taxes contractual assets and other, net (Tables) | 12 Months Ended
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Dec. 31, 2019
Statement [line items] |
Summary of Analysis of Accounts Receivable by Component | a) An analysis of accounts receivable by component at December 31, 2018 and 2019 is as follows:
|  | At December 31, |
|  | 2018 |  |  | 2019 |
Subscribers and distributors |  | Ps. | 173,053,226 |  |  | Ps. | 184,260,099 |
Telecommunications carriers for network interconnection and other services |  |  | 5,543,263 |  |  |  | 5,079,763 |
Recoverable taxes |  |  | 46,706,298 |  |  |  | 23,628,728 |
Sundry debtors |  |  | 12,685,281 |  |  |  | 12,084,050 |
Contract assets |  |  | 34,718,749 |  |  |  | 34,274,007 |
Impairment of trade receivables |  |  | ( 40,798,025 | ) |  |  | (39,480,909 | )
Total net |  | Ps. | 231,908,792 |  |  | Ps. | 219,845,738 |
Non-current subscribers, distributors and contractual assets |  |  | 15,681,872 |  |  |  | 15,139,442 |
Total current subscribers, distributors and contractual assets |  | Ps. | 216,226,920 |  |  | Ps. | 204,706,296 |
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, |
|  | 2017 |  |  | 2018 |  |  | 2019 |
Balance at beginning of year |  | Ps. | (37,351,677 | ) |  | Ps. | (39,044,925 | ) |  | Ps. | (40,798,025 | )
Increases recorded in expenses |  |  | (20,766,362 | ) |  |  | (19,535,707 | ) |  |  | (16,346,395 | )
Adjustment on initial application of IFRS 9 |  |  | — |  |  |  | (2,400,783 | ) |  |  | — |
Write-offs |  |  | 17,713,992 |  |  |  | 15,497,254 |  |  |  | 17,839,957 |
Business combination |  |  |  |  |  |  |  |  |  |  | (3,265,490 | )
Translation effect |  |  | 1,359,122 |  |  |  | 4,686,136 |  |  |  | 3,089,044 |
Balance at end of year |  | Ps. | (39,044,925 | ) |  | Ps. | (40,798,025 | ) |  | Ps. | (39,480,909 | )
Summary of Aging of Accounts Receivable | c) The following table shows the aging of accounts receivable at December 31, 2018 and 2019, 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, 2018 |  |  | Ps. 173,053,226 |  |  |  | Ps. 62,623,654 |  |  |  | Ps. 46,816,302 |  |  |  | Ps. 6,315,277 |  |  |  | Ps. 4,168,952 |  |  |  | Ps. 53,129,041 |
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 |
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, 2018 and 2019:
|  | Total |  |  | 1-90 days |  |  | Greater than 90 days |
December 31, 2018 |  |  | Ps. 40,798,025 |  |  |  | Ps. 4,079,803 |  |  |  | Ps. 36,718,222 |
December 31, 2019 |  |  | Ps. 39,480,909 |  |  |  | Ps. 3,948,091 |  |  |  | Ps. 35,532,818 |
Summary of Analysis of Contract Assets and Liabilities | e) An analysis of contract assets and liabilities at December 31, 2018 and 2019 is as follows:
|  | 2018 |  |  | 2019 |
Contract Assets: |  |  |  |  |  |  |  |
Balance at the beginning of the year |  | Ps. | 29,640,953 |  |  | Ps. | 34,718,749 |
Additions |  |  | 32,029,279 |  |  |  | 34,877,851 |
Disposals |  |  | (739,580 | ) |  |  | (2,658,641 | )
Business Combination |  |  | — |  |  |  | 576,463 |
Amortization |  |  | (24,503,907 | ) |  |  | (30,501,315 | )
Translation effect |  |  | (1,707,996 | ) |  |  | (2,739,100 | )
Balance at the end of the year |  | Ps. | 34,718,749 |  |  | Ps. | 34,274,007 |
Non-current contract assets |  | Ps. | 5,437,263 |  |  | Ps. | 1,786,560 |
Current portion contracts assets |  | Ps. | 29,281,486 |  |  | Ps. | 32,487,447 |

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