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v3.19.3.a.u2

Principal accounting policies - Additional information (Detail) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 USD ($) Operation | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Disclosure of initial application of standards or interpretations [Line Items] |  |  |
Trade payables | $ 2,855 | $ 3,180 |
Onerous contracts provision | $ 284 |  |
Number of operations | Operation | 13 |  |
Environmental Loss Contingency, Liability, Period Increase (Decrease) | $ 444 |  |
Operations in closure, monitoring and remediation, cost estimation period | 30 years |  |
Decreasing provision | $ 800 |  |
Provisions | $ 15,103 | 13,608 | $ 14,642
Provision for carrying value close-down, restoration and environmental |  | 9,975 |
Risk free rate decrease | 0.50% |  |
Risk free interest rate on provisions | 2.00% |  |
Intragroup loans | $ 14,000 |  |
Non-cancellable operating lease commitments not expected to be charged against EBITDA | $ 2,000 |  |
Bottom of range [member] |  |  |
Disclosure of initial application of standards or interpretations [Line Items] |  |  |
Risk free interest rate on provisions | 0.50% |  |
Top of range [member] |  |  |
Disclosure of initial application of standards or interpretations [Line Items] |  |  |
Provisions | $ 979 |  |
Close down and restoration/ environmental [member] |  |  |
Disclosure of initial application of standards or interpretations [Line Items] |  |  |
Provisions | 11,090 | 9,975 |
Trade Payables Subject To Early Settlement Election [Member] |  |  |
Disclosure of initial application of standards or interpretations [Line Items] |  |  |
Trade payables | 573 | $ 632 |
Escondida Joint Venture [Member] |  |  |
Disclosure of initial application of standards or interpretations [Line Items] |  |  |
Decrease in investment in Escondida Joint Venture | $ 138 |  |
Rio Tinto Kennecott [Member] |  |  |
Disclosure of initial application of standards or interpretations [Line Items] |  |  |
Operations with remaining lives | 10 years |  |
Environmental loss contingencies, gross | $ 700 |  |

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