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Discontinued Operations - Summary of Income Statement - Discontinued Operations (Detail) - USD ($)
$ / shares in Units, $ in Millions
 6 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Jun. 30, 2018
Disclosure of analysis of single amount of discontinued operations [abstract]      
Revenue $ 850 $ 1,002 $ 2,171
Other income 28 14 34
Expenses excluding net finance costs (608) (1,445) (5,790)
Profit/(loss) from operations 270 (429) (3,585)
Financial expenses (8) (12) (22)
Net finance costs (8) (12) (22)
Profit/(loss) before taxation 262 (441) (3,607)
Income tax (expense)/benefit (58) 609 686
Profit/(loss) after taxation from operating activities 204 168 (2,921)
Net loss on disposal (497)    
(Loss)/profit after taxation (293) 168 (2,921)
Attributable to non-controlling interests 7 22 26
Attributable to BHP shareholders $ (300) $ 146 $ (2,947)
Basic (loss)/earnings per ordinary share (cents) $ (5.6) $ 2.7 $ (55.4)
Diluted (loss)/earnings per ordinary share (cents) $ (5.6) $ 2.7 $ (55.4)