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Consolidated Statement of Comprehensive Income - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Jun. 30, 2018
Statement of comprehensive income [abstract]      
Profit after taxation from Continuing and Discontinued operations $ 4,149 $ 2,574 $ 4,823
Net valuation gains on investments taken to equity   10 11
Hedges:      
(Losses)/gains taken to equity (344) 666 82
Losses/(gains) transferred to the income statement 267 (623) (215)
Exchange fluctuations on translation of foreign operations taken to equity 2 (1) 2
Exchange fluctuations on translation of foreign operations transferred to income statement (6)    
Tax recognised within other comprehensive income 23 (15) 36
Total items that may be reclassified subsequently to the income statement (58) 37 (84)
Items that will not be reclassified to the income statement:      
Remeasurement gains on pension and medical schemes 8 2 1
Tax recognised within other comprehensive income 3 (3) (14)
Total items that will not be reclassified to the income statement 11 (1) (13)
Total other comprehensive (loss)/income (47) 36 (97)
Total comprehensive income 4,102 2,610 4,726
Attributable to non-controlling interests 389 561 1,118
Attributable to BHP shareholders $ 3,713 $ 2,049 $ 3,608