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Investments in Financial Instruments -Available-for-sale financial assets (Details) - MXN ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Reconciliation for all assets and liabilities measured at fair value |  |
Balance at beginning of year | $ 45,136,751 |
Balance at the end of year | 43,996,852 | $ 45,136,751
Warrants issued by UHI |  |
Reconciliation for all assets and liabilities measured at fair value |  |
Foreign exchange (loss) gain derived from the hedged Warrants issued by UHI | (1,622,976) | 6,891,428
Open Ended Fund |  |
Reconciliation for all assets and liabilities measured at fair value |  |
Foreign exchange (loss) gain derived from the hedged Warrants issued by UHI | (167,490) | 615,528
Available-for-sale financial assets |  |
Reconciliation for all assets and liabilities measured at fair value |  |
Balance at beginning of year | 44,754,998 | 40,915,820
Change in fair value in other comprehensive income (1) | (1,062,238) | 3,839,178
Balance at the end of year | 43,692,760 | 44,754,998
Available-for-sale financial assets | Warrants issued by UHI |  |
Reconciliation for all assets and liabilities measured at fair value |  |
Balance at beginning of year | 38,298,606 | 35,042,577
Change in fair value in other comprehensive income (1) | (1,903,423) | 3,256,029
Balance at the end of year | 36,395,183 | 38,298,606
Available-for-sale financial assets | Available-for-sale investments |  |
Reconciliation for all assets and liabilities measured at fair value |  |
Balance at beginning of year | 6,456,392 | 5,873,243
Change in fair value in other comprehensive income (1) | 841,185 | 583,149
Balance at the end of year | $ 7,297,577 | $ 6,456,392

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- Definition The gains (losses) on hedged items in fair value hedges, which are attributable to the hedged risk. [Refer: Fair value hedges [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 24 -Subparagraph a -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_24_a_ii&doctype=Standard&book=B -URIDate 2017-03-09 + Details
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- Definition The gains (losses) recognised in other comprehensive income on the fair value measurement of assets. [Refer: At fair value [member]; Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2017-01-01 -Paragraph 93 -Subparagraph e -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=13&date=2017-03-01&anchor=para_93_e_ii&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of non-current financial assets. [Refer: Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_25&doctype=Standard -URIDate 2017-03-09 + Details
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