XML 357 R154.htm IDEA: XBRL DOCUMENT v3.10.0.1
Deferred Taxation - Deferred tax liabilities and assets, prior to offsetting of balances (Parenthetical) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]    
Deferred tax liabilities $ 3,673 $ 3,628
Deferred tax assets 3,137 3,395
Deferred tax is not recognised on the unremitted earnings of subsidiaries and joint ventures 3,726 3,242
Tax payable on unremitted earnings $ 157 131
Deferred tax loss recovery period 6 years  
Recognised and unrecognised deferred tax assets $ 5,647 7,071
Unrecognised deferred tax assets 2,510 3,676
Unused tax losses [Member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]    
Deferred tax assets 1,519 1,679
Later than one year [Member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]    
Deferred tax liabilities 3,658 3,615
Deferred tax assets $ 3,133 $ 3,386