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Risks Arising from Financial Instruments - Summary of Currency Transactional Risk (Detail) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2020 | Dec. 31, 2019
Euro to Mexican Peso [Member] |  |
Disclosure Of Foreign Currency Exchange Exposure [line items] |  |
Closing rate | 25.72 | 21.17
Volatility of rates | 17.18% | 8.92%
Euro to Pound Sterling [Member] |  |
Disclosure Of Foreign Currency Exchange Exposure [line items] |  |
Closing rate | 0.91 | 0.85
Volatility of rates | 9.04% | 7.35%
Euro to South Korean Won [Member] |  |
Disclosure Of Foreign Currency Exchange Exposure [line items] |  |
Closing rate | 1,345.90 | 1,297.02
Volatility of rates | 10.91% | 6.17%
Euro to US Dollar [Member] |  |
Disclosure Of Foreign Currency Exchange Exposure [line items] |  |
Closing rate | 1.12 | 1.12
Volatility of rates | 6.97% | 4.69%
Pound Sterling to US Dollar [member] |  |
Disclosure Of Foreign Currency Exchange Exposure [line items] |  |
Closing rate | 1.23 | 1.32
Volatility of rates | 10.94% | 8.08%
US Dollar to Australian Dollar [member] |  |
Disclosure Of Foreign Currency Exchange Exposure [line items] |  |
Closing rate |  | 1.42
Volatility of rates |  | 6.70%
US Dollar to Chinese Yuan [Member] |  |
Disclosure Of Foreign Currency Exchange Exposure [line items] |  |
Closing rate | 7.07 | 6.96
Volatility of rates | 6.10% | 4.86%
US Dollar to Colombian Peso [Member] |  |
Disclosure Of Foreign Currency Exchange Exposure [line items] |  |
Closing rate | 3,752.17 | 3,272.63
Volatility of rates | 15.31% | 10.31%
US Dollar to Euro [Member] |  |
Disclosure Of Foreign Currency Exchange Exposure [line items] |  |
Closing rate | 0.89 | 0.89
Volatility of rates | 6.97% | 4.69%
US Dollar to Mexican Peso [Member] |  |
Disclosure Of Foreign Currency Exchange Exposure [line items] |  |
Closing rate | 22.97 | 18.85
Volatility of rates | 17.06% | 8.48%
US Dollar to Nigerian Naira [Member] |  |
Disclosure Of Foreign Currency Exchange Exposure [line items] |  |
Closing rate | 387.09 | 362.59
Volatility of rates | 10.14% | 3.31%
US Dollar to Peruvian Nuevo Sol [Member] |  |
Disclosure Of Foreign Currency Exchange Exposure [line items] |  |
Closing rate | 3.51 | 3.32
Volatility of rates | 6.72% | 4.50%
US Dollar to South African Rand [member] |  |
Disclosure Of Foreign Currency Exchange Exposure [line items] |  |
Closing rate | 17.36 | 14.04
Volatility of rates | 15.97% | 12.74%
US Dollar to South Korean Won [Member] |  |
Disclosure Of Foreign Currency Exchange Exposure [line items] |  |
Closing rate | 1,201.91 | 1,154.55
Volatility of rates | 13.15% | 7.78%
US Dollar to Tanzanian Shilling [Member] |  |
Disclosure Of Foreign Currency Exchange Exposure [line items] |  |
Closing rate | 2,313.52 | 2,300.14
Volatility of rates | 3.69% | 4.94%
US Dollar to Zambian Kwacha [Member] |  |
Disclosure Of Foreign Currency Exchange Exposure [line items] |  |
Closing rate | 18.14 | 14.02
Volatility of rates | 21.38% | 19.85%
US dollar to Brazilian real [Member] |  |
Disclosure Of Foreign Currency Exchange Exposure [line items] |  |
Closing rate | 5.48 |
Volatility of rates | 18.93% |
Bottom of range [member] | Euro to Mexican Peso [Member] |  |
Disclosure Of Foreign Currency Exchange Exposure [line items] |  |
Possible closing rate | 21.30 | 19.28
Bottom of range [member] | Euro to Pound Sterling [Member] |  |
Disclosure Of Foreign Currency Exchange Exposure [line items] |  |
Possible closing rate | 0.83 | 0.79
Bottom of range [member] | Euro to South Korean Won [Member] |  |
Disclosure Of Foreign Currency Exchange Exposure [line items] |  |
Possible closing rate | 1,199.03 | 1,216.94
Bottom of range [member] | Euro to US Dollar [Member] |  |
Disclosure Of Foreign Currency Exchange Exposure [line items] |  |
Possible closing rate | 1.04 | 1.07
Bottom of range [member] | Pound Sterling to US Dollar [member] |  |
Disclosure Of Foreign Currency Exchange Exposure [line items] |  |
Possible closing rate | 1.09 | 1.21
Bottom of range [member] | US Dollar to Australian Dollar [member] |  |
Disclosure Of Foreign Currency Exchange Exposure [line items] |  |
Possible closing rate |  | 1.33
Bottom of range [member] | US Dollar to Chinese Yuan [Member] |  |
Disclosure Of Foreign Currency Exchange Exposure [line items] |  |
Possible closing rate | 6.64 | 6.62
Bottom of range [member] | US Dollar to Colombian Peso [Member] |  |
Disclosure Of Foreign Currency Exchange Exposure [line items] |  |
Possible closing rate | 3,177.73 | 2,935.33
Bottom of range [member] | US Dollar to Euro [Member] |  |
Disclosure Of Foreign Currency Exchange Exposure [line items] |  |
Possible closing rate | 0.83 | 0.85
Bottom of range [member] | US Dollar to Mexican Peso [Member] |  |
Disclosure Of Foreign Currency Exchange Exposure [line items] |  |
Possible closing rate | 19.05 | 17.25
Bottom of range [member] | US Dollar to Nigerian Naira [Member] |  |
Disclosure Of Foreign Currency Exchange Exposure [line items] |  |
Possible closing rate | 347.85 | 350.58
Bottom of range [member] | US Dollar to Peruvian Nuevo Sol [Member] |  |
Disclosure Of Foreign Currency Exchange Exposure [line items] |  |
Possible closing rate | 3.28 | 3.17
Bottom of range [member] | US Dollar to South African Rand [member] |  |
Disclosure Of Foreign Currency Exchange Exposure [line items] |  |
Possible closing rate | 14.59 | 12.26
Bottom of range [member] | US Dollar to South Korean Won [Member] |  |
Disclosure Of Foreign Currency Exchange Exposure [line items] |  |
Possible closing rate | 1,043.87 | 1,064.67
Bottom of range [member] | US Dollar to Tanzanian Shilling [Member] |  |
Disclosure Of Foreign Currency Exchange Exposure [line items] |  |
Possible closing rate | 2,228.23 | 2,186.57
Bottom of range [member] | US Dollar to Zambian Kwacha [Member] |  |
Disclosure Of Foreign Currency Exchange Exposure [line items] |  |
Possible closing rate | 14.26 | 11.24
Bottom of range [member] | US dollar to Brazilian real [Member] |  |
Disclosure Of Foreign Currency Exchange Exposure [line items] |  |
Possible closing rate | 4.44 |
Top of range [member] | Euro to Mexican Peso [Member] |  |
Disclosure Of Foreign Currency Exchange Exposure [line items] |  |
Possible closing rate | 30.14 | 23.06
Top of range [member] | Euro to Pound Sterling [Member] |  |
Disclosure Of Foreign Currency Exchange Exposure [line items] |  |
Possible closing rate | 0.99 | 0.91
Top of range [member] | Euro to South Korean Won [Member] |  |
Disclosure Of Foreign Currency Exchange Exposure [line items] |  |
Possible closing rate | 1,492.76 | 1,377.10
Top of range [member] | Euro to US Dollar [Member] |  |
Disclosure Of Foreign Currency Exchange Exposure [line items] |  |
Possible closing rate |  | 1.18
Top of range [member] | Pound Sterling to US Dollar [member] |  |
Disclosure Of Foreign Currency Exchange Exposure [line items] |  |
Possible closing rate | 1.36 | 1.43
Top of range [member] | US Dollar to Australian Dollar [member] |  |
Disclosure Of Foreign Currency Exchange Exposure [line items] |  |
Possible closing rate |  | 1.52
Top of range [member] | US Dollar to Chinese Yuan [Member] |  |
Disclosure Of Foreign Currency Exchange Exposure [line items] |  |
Possible closing rate | 7.51 | 7.30
Top of range [member] | US Dollar to Colombian Peso [Member] |  |
Disclosure Of Foreign Currency Exchange Exposure [line items] |  |
Possible closing rate | 4,326.62 | 3,609.92
Top of range [member] | US Dollar to Euro [Member] |  |
Disclosure Of Foreign Currency Exchange Exposure [line items] |  |
Possible closing rate | 0.96 | 0.93
Top of range [member] | US Dollar to Mexican Peso [Member] |  |
Disclosure Of Foreign Currency Exchange Exposure [line items] |  |
Possible closing rate | 26.89 | 20.44
Top of range [member] | US Dollar to Nigerian Naira [Member] |  |
Disclosure Of Foreign Currency Exchange Exposure [line items] |  |
Possible closing rate | 426.33 | 374.60
Top of range [member] | US Dollar to Peruvian Nuevo Sol [Member] |  |
Disclosure Of Foreign Currency Exchange Exposure [line items] |  |
Possible closing rate | 3.75 | 3.47
Top of range [member] | US Dollar to South African Rand [member] |  |
Disclosure Of Foreign Currency Exchange Exposure [line items] |  |
Possible closing rate | 20.14 | 15.83
Top of range [member] | US Dollar to South Korean Won [Member] |  |
Disclosure Of Foreign Currency Exchange Exposure [line items] |  |
Possible closing rate | 1,359.95 | 1,244.42
Top of range [member] | US Dollar to Tanzanian Shilling [Member] |  |
Disclosure Of Foreign Currency Exchange Exposure [line items] |  |
Possible closing rate | 2,398.80 | 2,413.71
Top of range [member] | US Dollar to Zambian Kwacha [Member] |  |
Disclosure Of Foreign Currency Exchange Exposure [line items] |  |
Possible closing rate | 22.02 | 16.81
Top of range [member] | US dollar to Brazilian real [Member] |  |
Disclosure Of Foreign Currency Exchange Exposure [line items] |  |
Possible closing rate | 6.51 |

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