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Debt, Finance Lease Obligations and Other Notes Payable - Hedged Items (Details) $ in Thousands, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 MXN ($) | Dec. 31, 2016 MXN ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 MXN ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2016 MXN ($)
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |
Principal amount |  |  |  | $ 123,550,897 |  |
Warrants issued by UHI |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |
Foreign exchange (loss) gain derived from the hedged Warrants issued by UHI | $ (1,622,976) | $ 6,891,428 |  |  |  |
Open Ended Fund |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |
Foreign exchange (loss) gain derived from the hedged Warrants issued by UHI | (167,490) | 615,528 |  |  |  |
Designated as hedging instruments |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |
Principal amount |  |  | $ 2,440.3 | 48,086,944 | $ 2,386.6 | $ 49,352,779
Designated as hedging instruments | Investment in shares of UHI |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |
Foreign currency translation gain (loss) derived from the hedge net investment in shares of UHI | 260,133 | (1,189,430) |  |  |  |
Designated as hedging instruments | Investment in shares of UHI | Net investment |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |
Principal amount |  |  | 413.3 | 8,144,843 | 350.7 | 7,236,587
Designated as hedging instruments | Warrants issued by UHI |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |
Principal amount |  |  | 1,847.0 | 36,395,183 | 1,855.9 | 38,298,606
Foreign exchange (loss) gain derived from the hedged Warrants issued by UHI | (1,622,976) | 6,891,428 |  |  |  |
Designated as hedging instruments | Open Ended Fund | Fair value hedge of foreign currency |  |  |  |  |  |
Disclosure of detailed information about hedged items [line items] |  |  |  |  |  |
Principal amount |  |  | $ 180.0 | $ 3,546,918 | $ 180.0 | $ 3,817,586
Foreign exchange (loss) gain derived from the hedged Warrants issued by UHI | $ (167,490) | $ 615,528 |  |  |  |

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