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Financial Risk Management - Summary of Carrying Amounts of Group's Notes and Debentures by Currency and Derivatives Which Hedge (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Disclosure of detailed information about hedged items [line items]    
Carrying amount of notes and debentures $ 21,529 $ 23,298
Recognised in cash flow hedging reserve (163) (85)
Recognised in cost of hedging reserve 106  
Recognised in the income statement 68 71
Accrued cash flows 251 307
Total derivatives fair value 204 805
Hedged value of notes and debentures 21,471 23,810
Currency risk [member]    
Disclosure of detailed information about hedged items [line items]    
Risk 1,304 1,145
Interest rate risk [member]    
Disclosure of detailed information about hedged items [line items]    
Risk (1,362) $ (633)
USD [member]    
Disclosure of detailed information about hedged items [line items]    
Carrying amount of notes and debentures 9,433  
Recognised in the income statement 20  
Accrued cash flows 111  
Total derivatives fair value (122)  
Hedged value of notes and debentures 9,180  
USD [member] | Interest rate risk [member]    
Disclosure of detailed information about hedged items [line items]    
Risk (253)  
GBP [member]    
Disclosure of detailed information about hedged items [line items]    
Carrying amount of notes and debentures 3,118  
Recognised in cash flow hedging reserve (57)  
Recognised in cost of hedging reserve 70  
Recognised in the income statement (2)  
Accrued cash flows 62  
Total derivatives fair value 234  
Hedged value of notes and debentures 3,279  
GBP [member] | Currency risk [member]    
Disclosure of detailed information about hedged items [line items]    
Risk 678  
GBP [member] | Interest rate risk [member]    
Disclosure of detailed information about hedged items [line items]    
Risk (517)  
EUR [member]    
Disclosure of detailed information about hedged items [line items]    
Carrying amount of notes and debentures 7,680  
Recognised in cash flow hedging reserve (100)  
Recognised in cost of hedging reserve 33  
Recognised in the income statement 54  
Accrued cash flows 82  
Total derivatives fair value (119)  
Hedged value of notes and debentures 7,492  
EUR [member] | Currency risk [member]    
Disclosure of detailed information about hedged items [line items]    
Risk 378  
EUR [member] | Interest rate risk [member]    
Disclosure of detailed information about hedged items [line items]    
Risk (566)  
CAD [member]    
Disclosure of detailed information about hedged items [line items]    
Carrying amount of notes and debentures 594  
Recognised in cash flow hedging reserve (5)  
Recognised in cost of hedging reserve 3  
Recognised in the income statement (4)  
Accrued cash flows 1  
Total derivatives fair value 148  
Hedged value of notes and debentures 747  
CAD [member] | Currency risk [member]    
Disclosure of detailed information about hedged items [line items]    
Risk 175  
CAD [member] | Interest rate risk [member]    
Disclosure of detailed information about hedged items [line items]    
Risk (22)  
AUD [member]    
Disclosure of detailed information about hedged items [line items]    
Carrying amount of notes and debentures 704  
Recognised in cash flow hedging reserve (1)  
Accrued cash flows (5)  
Total derivatives fair value 63  
Hedged value of notes and debentures 773  
AUD [member] | Currency risk [member]    
Disclosure of detailed information about hedged items [line items]    
Risk 73  
AUD [member] | Interest rate risk [member]    
Disclosure of detailed information about hedged items [line items]    
Risk $ (4)