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Principal joint ventures - Reconciliation of financial information for joint ventures by carrying value (Parenthetical) (Detail) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Disclosure of joint ventures [line items] |  |  |
– deferred tax liabilities | $ 3,220 | $ 3,673 | $ 3,673
Investment in equity accounted units [Member] |  |  |
Disclosure of joint ventures [line items] |  |  |
– deferred tax liabilities | $ 362 | $ 413 |

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