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Revenue - Summary of Revenue by Segment (Detail) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Jun. 30, 2018
Disclosure of reportable segments [line items] |  |  |
Revenue from contracts with customers | $ 20,858 | $ 20,088 | $ 42,748
Other revenue | (116) | 438 | 381
Total revenue | 20,742 | 20,526 | 43,129
Reportable segments [member] | Petroleum [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Revenue from contracts with customers | 3,071 | 2,525 | 5,194
Other revenue | 132 | 56 | 214
Total revenue | 3,203 | 2,581 | 5,408
Reportable segments [member] | Copper [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Revenue from contracts with customers | 5,328 | 5,790 | 12,660
Other revenue | (259) | 342 | 121
Total revenue | 5,069 | 6,132 | 12,781
Reportable segments [member] | Iron Ore [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Revenue from contracts with customers | 7,401 | 7,196 | 14,782
Other revenue | 17 | 25 | 28
Total revenue | 7,418 | 7,221 | 14,810
Reportable segments [member] | Coal [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Revenue from contracts with customers | 4,509 | 4,044 | 8,887
Other revenue | 3 | 3 | 2
Total revenue | 4,512 | 4,047 | 8,889
Group and unallocated items/eliminations [member] |  |  |
Disclosure of reportable segments [line items] |  |  |
Revenue from contracts with customers | 549 | 533 | 1,225
Other revenue | (9) | 12 | 16
Total revenue | $ 540 | $ 545 | $ 1,241

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