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Operating segments - additional information - Summary of non-current assets other than excluded items (Detail) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Disclosure Of Geographical Areas [Line Items] |  |
Non-current assets other than excluded items | $ 64,655 | $ 71,063
Deferred tax assets | 3,137 | 3,395
Other financial assets (including loans to equity accounted units) | 814 | 510
Tax recoverable | 8 | 30
Trade and other receivables | 1,304 | 1,397
Total non-current assets | 70,047 | 76,554
Quasi equity loans [member] |  |
Disclosure Of Geographical Areas [Line Items] |  |
Quasi equity loans to equity accounted units | 129 | 159
Australia [Member] |  |
Disclosure Of Geographical Areas [Line Items] |  |
Non-current assets other than excluded items | 28,592 | 32,890
Deferred tax assets | 796 | 1,055
Canada [Member] |  |
Disclosure Of Geographical Areas [Line Items] |  |
Non-current assets other than excluded items | 13,775 | 14,822
Deferred tax assets | 545 | 546
Mongolia [Member] |  |
Disclosure Of Geographical Areas [Line Items] |  |
Non-current assets other than excluded items | 9,912 | 8,582
Deferred tax assets | 703 | 631
United States [Member] |  |
Disclosure Of Geographical Areas [Line Items] |  |
Non-current assets other than excluded items | 4,815 | 4,812
Deferred tax assets | 932 | 877
Africa [Member] |  |
Disclosure Of Geographical Areas [Line Items] |  |
Non-current assets other than excluded items | 3,476 | 3,781
South America [Member] |  |
Disclosure Of Geographical Areas [Line Items] |  |
Non-current assets other than excluded items | 3,047 | 3,304
Indonesia [member] |  |
Disclosure Of Geographical Areas [Line Items] |  |
Non-current assets other than excluded items |  | 1,458
Europe excluding France and the UK [member] |  |
Disclosure Of Geographical Areas [Line Items] |  |
Non-current assets other than excluded items | 50 | 362
United Kingdom [Member] |  |
Disclosure Of Geographical Areas [Line Items] |  |
Non-current assets other than excluded items | 59 | 66
France [member] |  |
Disclosure Of Geographical Areas [Line Items] |  |
Non-current assets other than excluded items | 79 | 94
Other countries [Member] |  |
Disclosure Of Geographical Areas [Line Items] |  |
Non-current assets other than excluded items | 850 | 892
Deferred tax assets | $ 161 | $ 286

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