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INCOME TAXES - Additional Information (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deductible temporary differences for which no deferred tax asset is recognised $ 859 $ 820
Temporary differences associated with investments in subsidiaries, associates and joint ventures for which deferred tax liabilities have not been recognised 2,411 2,230
Capital Losses    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deductible temporary differences for which no deferred tax asset is recognised 480 442
Non-Capital Losses    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deductible temporary differences for which no deferred tax asset is recognised 379 378
Non-Capital Losses | Expire between 2020 to 2030    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deductible temporary differences for which no deferred tax asset is recognised 7 5
Non-Capital Losses | Have no expiry dates    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deductible temporary differences for which no deferred tax asset is recognised $ 372 373
Indian toll roads    
Disclosure of detailed information about business combination [line items]    
Net deferred tax assets   $ 10