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Financial instruments and risk management - Gains or Losses Associated with Ten Percent Strengthening of US Dollar (Detail) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Disclosure of detailed information about hedging instruments [Line Items] |  |  |
Effect on net earnings | $ 52 | $ 56 | $ (61)
Australian dollar |  |  |
Disclosure of detailed information about hedging instruments [Line Items] |  |  |
Closing exchange rate | 0.70 | 0.70 | 0.78
Canadian dollar |  |  |
Disclosure of detailed information about hedging instruments [Line Items] |  |  |
Closing exchange rate | 0.77 | 0.73 | 0.79
Euro |  |  |
Disclosure of detailed information about hedging instruments [Line Items] |  |  |
Closing exchange rate | 1.12 | 1.14 | 1.20
Foreign exchange risk | Australian dollar |  |  |
Disclosure of detailed information about hedging instruments [Line Items] |  |  |
Closing exchange rate | 70 | 70 |
Effect on net earnings | $ 453 | $ 346 |
Amount impacting underlying earnings | (4) | 1 |
Foreign Exchange Gain Loss Amount Impact Directly On Equity | $ (1,002) | $ (993) |
Foreign exchange risk | Canadian dollar |  |  |
Disclosure of detailed information about hedging instruments [Line Items] |  |  |
Closing exchange rate | 77 | 73 |
Effect on net earnings | $ (143) | $ (82) |
Amount impacting underlying earnings | 7 | 7 |
Foreign Exchange Gain Loss Amount Impact Directly On Equity | $ 0 | $ 0 |
Foreign exchange risk | Euro |  |  |
Disclosure of detailed information about hedging instruments [Line Items] |  |  |
Closing exchange rate | 112 | 114 |
Effect on net earnings | $ 178 | $ 202 |
Amount impacting underlying earnings | 4 | 5 |
Foreign Exchange Gain Loss Amount Impact Directly On Equity | $ 0 | $ 0 |

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