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New Standards and Interpretations Adopted in the Current Year - Summary of impact of transition to IFRS 9 on retained earnings (Detail) - USD ($)
$ in Millions
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Disclosure Of Financial Instruments [Line Items]      
Retained earnings $ 27,025   $ 23,761
Revaluation of funds   $ 1  
IFRS 9 [member]      
Disclosure Of Financial Instruments [Line Items]      
Retained earnings     $ 23,761
Costs of hedging adjustment   22  
Reclassification of equity investments from available-for-sale to FVPL   12  
Impairment provision resulting from the application of the ECL model   (7)  
Tax impact   1  
Revaluation of funds   1  
Adjustment to retained earnings from adoption of IFRS 9 on 1 January 2018 (sub-total)   (15)  
Retained Earnings 1 January 2018 IFRS 9 (Before Restatement for IFRS 15) [Member] | IFRS 9 [member]      
Disclosure Of Financial Instruments [Line Items]      
Retained earnings   $ 23,746