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Deferred Taxation - Deferred tax liabilities and assets, prior to offsetting of balances (Footnotes) (Detail) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Deferred tax liabilities $ 3,220 $ 3,673 $ 3,673
Deferred tax assets 3,102 3,137 3,137
Deferred tax is not recognised on the unremitted earnings of subsidiaries and joint ventures 3,861 3,726  
Tax payable on unremitted earnings 164 157  
Recognised and unrecognised deferred tax assets 6,264 5,647  
Unrecognised deferred tax assets 3,162 2,510 $ 2,510
Unused tax losses      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Deferred tax assets 1,186 1,519  
Later than one year      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Deferred tax liabilities 3,202 3,658  
Deferred tax assets $ 3,087 $ 3,133