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BORROWINGS - Borrowings by Currency (Details)
₨ in Millions, £ in Millions, S/ in Millions, $ in Millions, $ in Millions, $ in Millions, $ in Millions, $ in Millions, in Millions
Dec. 31, 2017
USD ($)
Dec. 31, 2017
COP ($)
Dec. 31, 2017
GBP (£)
Dec. 31, 2017
CLF ( )
Dec. 31, 2017
PEN (S/)
Dec. 31, 2017
AUD ($)
Dec. 31, 2017
CAD ($)
Dec. 31, 2017
INR (₨)
Dec. 31, 2017
NZD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2016
COP ($)
Dec. 31, 2016
GBP (£)
Dec. 31, 2016
CLF ( )
Dec. 31, 2016
PEN (S/)
Dec. 31, 2016
AUD ($)
Dec. 31, 2016
CAD ($)
Dec. 31, 2016
INR (₨)
Dec. 31, 2016
NZD ($)
Disclosure of detailed information about borrowings [line items]                                    
Subsidiary and corporate borrowings $ 10,164                 $ 8,326                
Interest on non-recourse borrowings                                    
Disclosure of detailed information about borrowings [line items]                                    
Subsidiary and corporate borrowings 8,063                 7,324                
Interest on non-recourse borrowings | AUD                                    
Disclosure of detailed information about borrowings [line items]                                    
Subsidiary and corporate borrowings 1,013         $ 1,297       922         $ 1,281      
Interest on non-recourse borrowings | GBP                                    
Disclosure of detailed information about borrowings [line items]                                    
Subsidiary and corporate borrowings 1,735   £ 1,283             1,390   £ 1,125            
Interest on non-recourse borrowings | USD                                    
Disclosure of detailed information about borrowings [line items]                                    
Subsidiary and corporate borrowings 3,087                 3,039                
Interest on non-recourse borrowings | UF                                    
Disclosure of detailed information about borrowings [line items]                                    
Subsidiary and corporate borrowings 960     22           901     23          
Interest on non-recourse borrowings | CAD                                    
Disclosure of detailed information about borrowings [line items]                                    
Subsidiary and corporate borrowings 397           $ 499     263           $ 354    
Interest on non-recourse borrowings | COP                                    
Disclosure of detailed information about borrowings [line items]                                    
Subsidiary and corporate borrowings 184 $ 549,384               133 $ 403,030              
Interest on non-recourse borrowings | PEN                                    
Disclosure of detailed information about borrowings [line items]                                    
Subsidiary and corporate borrowings 458       S/ 1,483         439       S/ 1,473        
Interest on non-recourse borrowings | INR                                    
Disclosure of detailed information about borrowings [line items]                                    
Subsidiary and corporate borrowings 186             ₨ 11,847   196             ₨ 13,324  
Interest on non-recourse borrowings | NZD                                    
Disclosure of detailed information about borrowings [line items]                                    
Subsidiary and corporate borrowings $ 43               $ 61 $ 41               $ 59