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Equity - Summary of Capital Stock (Detail) - shares | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Disclosure of classes of share capital [line items] |  |
Units | 3,578,226,270 |
Series "B" | 9,246,420,270 |
Series "D" | 8,644,711,080 |
Subseries "D-B" | 4,322,355,540 |
Subseries "D-L" | 4,322,355,540 |
Total shares, outstanding | 17,891,131,350 | 17,891,131,350
B units [member] |  |
Disclosure of classes of share capital [line items] |  |
Units | 1,417,048,500 |
Series "B" | 7,085,242,500 |
Total shares, outstanding | 7,085,242,500 |
BD units [member] |  |
Disclosure of classes of share capital [line items] |  |
Units | 2,161,177,770 |
Series "B" | 2,161,177,770 |
Series "D" | 8,644,711,080 |
Subseries "D-B" | 4,322,355,540 |
Subseries "D-L" | 4,322,355,540 |
Total shares, outstanding | 10,805,888,850 |

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