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NON-RECOURSE BORROWINGS - Schedule of Borrowings By Currency (Details)
€ in Millions, ₩ in Millions, ₨ in Millions, £ in Millions, R$ in Millions, $ in Millions, $ in Millions, $ in Millions, $ in Millions, in Millions
Dec. 31, 2018
USD ($)
Dec. 31, 2018
BRL (R$)
Dec. 31, 2018
EUR (€)
Dec. 31, 2018
COP ($)
Dec. 31, 2018
CLF ( )
Dec. 31, 2018
INR (₨)
Dec. 31, 2018
CAD ($)
Dec. 31, 2018
AUD ($)
Dec. 31, 2018
GBP (£)
Dec. 31, 2018
KRW (₩)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
BRL (R$)
Dec. 31, 2017
EUR (€)
Dec. 31, 2017
COP ($)
Dec. 31, 2017
CLF ( )
Dec. 31, 2017
INR (₨)
Dec. 31, 2017
CAD ($)
Dec. 31, 2017
AUD ($)
Dec. 31, 2017
GBP (£)
Dec. 31, 2017
KRW (₩)
Disclosure of detailed information about borrowings [line items]                                        
Property-specific borrowings $ 103,209                   $ 63,721                  
U.S. dollars                                        
Disclosure of detailed information about borrowings [line items]                                        
Property-specific borrowings 72,747                   39,164                  
British pounds                                        
Disclosure of detailed information about borrowings [line items]                                        
Property-specific borrowings 7,200               £ 5,643   6,117               £ 4,525  
Canadian dollars                                        
Disclosure of detailed information about borrowings [line items]                                        
Property-specific borrowings 6,285           $ 8,573       5,272           $ 6,627      
Australian dollars                                        
Disclosure of detailed information about borrowings [line items]                                        
Property-specific borrowings 2,968             $ 4,210     3,518             $ 4,506    
Brazilian reais                                        
Disclosure of detailed information about borrowings [line items]                                        
Property-specific borrowings 3,825 R$ 14,820                 2,677 R$ 8,856                
Korean won                                        
Disclosure of detailed information about borrowings [line items]                                        
Property-specific borrowings 1,613                 ₩ 1,797,415 1,682                 ₩ 1,795,518
Colombian pesos                                        
Disclosure of detailed information about borrowings [line items]                                        
Property-specific borrowings 1,855     $ 6,025,270             1,556     $ 4,645,648            
Indian rupees                                        
Disclosure of detailed information about borrowings [line items]                                        
Property-specific borrowings 2,026         ₨ 140,694         1,346         ₨ 85,720        
Chilean unidades de fomento                                        
Disclosure of detailed information about borrowings [line items]                                        
Property-specific borrowings 837       21           976       22          
Other                                        
Disclosure of detailed information about borrowings [line items]                                        
Property-specific borrowings 589                   647                  
European Union euros                                        
Disclosure of detailed information about borrowings [line items]                                        
Property-specific borrowings $ 3,264   € 2,846               $ 766   € 638