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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