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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, 2020
Jun. 30, 2019
Disclosure of detailed information about hedged items [line items]    
Carrying amount of notes and debentures $ 21,045 $ 21,529
Recognised in cash flow hedging reserve (71) (163)
Recognised in cost of hedging reserve 32 106
Recognised in the income statement 72 68
Accrued cash flows 151 251
Total derivatives fair value (433) 204
Hedged value of notes and debentures 20,428 21,471
Currency risk [member]    
Disclosure of detailed information about hedged items [line items]    
Risk 1,463 1,304
Interest rate risk [member]    
Disclosure of detailed information about hedged items [line items]    
Risk (2,080) (1,362)
USD [member]    
Disclosure of detailed information about hedged items [line items]    
Carrying amount of notes and debentures 9,926 9,433
Recognised in cash flow hedging reserve 0  
Recognised in cost of hedging reserve 0  
Recognised in the income statement 29 20
Accrued cash flows 74 111
Total derivatives fair value (639) (122)
Hedged value of notes and debentures 9,184 9,180
USD [member] | Currency risk [member]    
Disclosure of detailed information about hedged items [line items]    
Risk 0  
USD [member] | Interest rate risk [member]    
Disclosure of detailed information about hedged items [line items]    
Risk (742) (253)
GBP [member]    
Disclosure of detailed information about hedged items [line items]    
Carrying amount of notes and debentures 3,245 3,118
Recognised in cash flow hedging reserve (16) (57)
Recognised in cost of hedging reserve 13 70
Recognised in the income statement (18) (2)
Accrued cash flows 47 62
Total derivatives fair value 60 234
Hedged value of notes and debentures 3,279 3,279
GBP [member] | Currency risk [member]    
Disclosure of detailed information about hedged items [line items]    
Risk 764 678
GBP [member] | Interest rate risk [member]    
Disclosure of detailed information about hedged items [line items]    
Risk (730) (517)
EUR [member]    
Disclosure of detailed information about hedged items [line items]    
Carrying amount of notes and debentures 7,294 7,680
Recognised in cash flow hedging reserve (55) (100)
Recognised in cost of hedging reserve 21 33
Recognised in the income statement 65 54
Accrued cash flows 32 82
Total derivatives fair value (13) (119)
Hedged value of notes and debentures 7,218 7,492
EUR [member] | Currency risk [member]    
Disclosure of detailed information about hedged items [line items]    
Risk 500 378
EUR [member] | Interest rate risk [member]    
Disclosure of detailed information about hedged items [line items]    
Risk (576) (566)
CAD [member]    
Disclosure of detailed information about hedged items [line items]    
Carrying amount of notes and debentures 580 594
Recognised in cash flow hedging reserve 0 (5)
Recognised in cost of hedging reserve (2) 3
Recognised in the income statement (4) (4)
Accrued cash flows (2) 1
Total derivatives fair value 159 148
Hedged value of notes and debentures 747 747
CAD [member] | Currency risk [member]    
Disclosure of detailed information about hedged items [line items]    
Risk 199 175
CAD [member] | Interest rate risk [member]    
Disclosure of detailed information about hedged items [line items]    
Risk $ (32) (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)