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Standardised Measure of Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves (Standardised Measure) (Detail) - USD ($)
$ in Millions
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2015
Discounted future net cash flows relating to proved oil and gas reserves [Line Items]        
Future cash inflows $ 47,534 $ 43,898 $ 37,016  
Future production costs (17,028) (18,373) (14,387)  
Future development costs (10,585) (10,373) (6,776)  
Future income taxes (4,056) (2,272) (2,950)  
Future net cash flows 15,865 12,880 12,903  
Discount at 10 per cent per annum (5,625) (4,638) (3,916)  
Standardised measure 10,240 8,242 8,987 $ 17,244
Australia [member]        
Discounted future net cash flows relating to proved oil and gas reserves [Line Items]        
Future cash inflows 17,398 18,407 21,902  
Future production costs (5,345) (6,663) (7,306)  
Future development costs (3,842) (3,714) (3,431)  
Future income taxes (1,919) (1,508) (3,082)  
Future net cash flows 6,292 6,522 8,083  
Discount at 10 per cent per annum (1,713) (2,104) (2,961)  
Standardised measure 4,579 4,418 5,122  
United States [member]        
Discounted future net cash flows relating to proved oil and gas reserves [Line Items]        
Future cash inflows 28,012 23,537 13,088  
Future production costs (11,182) (11,176) (6,514)  
Future development costs (6,554) (6,451) (3,063)  
Future income taxes (1,236) (18) 800  
Future net cash flows 9,040 5,892 4,311  
Discount at 10 per cent per annum (3,783) (2,426) (834)  
Standardised measure 5,257 3,466 3,477  
Other countries [member]        
Discounted future net cash flows relating to proved oil and gas reserves [Line Items]        
Future cash inflows 2,124 1,954 2,026  
Future production costs (501) (534) (567)  
Future development costs (189) (208) (282)  
Future income taxes (901) (746) (668)  
Future net cash flows 533 466 509  
Discount at 10 per cent per annum (129) (108) (121)  
Standardised measure $ 404 $ 358 $ 388