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Financial Instruments - Summary of Carrying Amounts and Fair Value of Financial Instruments (Detail) $ in Millions, $ in Millions | Dec. 31, 2017 USD ($) | Dec. 31, 2017 MXN ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2016 MXN ($)
--- | --- | --- | --- | ---
Financial assets |  |  |  |
Derivative instruments |  | $ 794 |  | $ 1,900
Other investments and non-current accounts receivable |  | 4,964 |  | 5,220
Other investments and non-current accounts receivable |  | 5,758 |  | 7,120
Financial liabilities |  |  |  |
Long-term debt | $ 9,892 | 177,022 | $ 11,379 | 235,016
Other financial obligations |  | 12,859 |  | 25,972
Derivative instruments |  | 402 |  | 818
Total financial liabilities |  | 190,283 |  | 261,806
At Fair Value [Member] |  |  |  |
Financial assets |  |  |  |
Derivative instruments |  | 794 |  | 1,900
Other investments and non-current accounts receivable |  | 4,964 |  | 5,220
Other investments and non-current accounts receivable |  | 5,758 |  | 7,120
Financial liabilities |  |  |  |
Long-term debt |  | 184,220 |  | 241,968
Other financial obligations |  | 13,381 |  | 27,419
Derivative instruments |  | 402 |  | 818
Total financial liabilities |  | $ 198,003 |  | $ 270,205

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