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Basis of Preparation - Summary of retained earnings and reserves (Detail)Disclosure - Other disclosures - Summary of retained earnings and reserves (Detail)
$ in Millions
Jan. 01, 2018
USD ($)
Disclosure Of Other Reserves And Retained Earnings [Line Items]  
Beginning balance $ 12,284
Effect on Available for Sale ('AfS') Reserve [Member] | IFRS 9 [Member]  
Disclosure Of Other Reserves And Retained Earnings [Line Items]  
Beginning balance 20
Reclassification of equity investments from AfS (20)
Total Impact (20)
Effect On FVOCI Reserve [Member] | IFRS 9 [Member]  
Disclosure Of Other Reserves And Retained Earnings [Line Items]  
Reclassification of equity investments from AfS 8
Total Impact 8
Ending balance 8
Costs of Hedging Reserve [Member] | IFRS 9 [Member]  
Disclosure Of Other Reserves And Retained Earnings [Line Items]  
Impact of costs of hedging adjustment 26
Total Impact 26
Ending balance 26
Cash Flow Hedge Reserve [Member] | IFRS 9 [Member]  
Disclosure Of Other Reserves And Retained Earnings [Line Items]  
Beginning balance 32
Impact of costs of hedging adjustment (4)
Total Impact (4)
Ending balance 28
Effect on Retained Earnings [Member] | IFRS 9 [Member]  
Disclosure Of Other Reserves And Retained Earnings [Line Items]  
Beginning balance 23,761
Reclassification of equity investments from AfS 12
Impact of costs of hedging adjustment (22)
Impairment provisions (7)
Tax impact 1
Re-measurement of funds 1
Total Impact (15)
Ending balance $ 23,746