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FINANCIAL RISK MANAGEMENT - Maturity Analysis of Financial Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Accounts payable and other liabilities $ 1,043 $ 786
Corporate borrowings 2,101 1,002
Non-recourse borrowings 8,087 7,336
Financial liabilities (current and non-current) 1,313 381
Interest Expense:    
Corporate borrowings 227 147
Non-recourse borrowings 2,936 3,024
Less than 1 year    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Accounts payable and other liabilities 646 540
Corporate borrowings 99 295
Non-recourse borrowings 372 286
Financial liabilities (current and non-current) 237 229
Interest Expense:    
Corporate borrowings 49 40
Non-recourse borrowings 381 361
1-2 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Accounts payable and other liabilities 45 34
Corporate borrowings 0 93
Non-recourse borrowings 571 233
Financial liabilities (current and non-current) 58 29
Interest Expense:    
Corporate borrowings 47 29
Non-recourse borrowings 348 342
2-5 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Accounts payable and other liabilities 59 26
Corporate borrowings 1,445 279
Non-recourse borrowings 2,043 1,708
Financial liabilities (current and non-current) 930 49
Interest Expense:    
Corporate borrowings 106 64
Non-recourse borrowings 864 871
5 plus years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Accounts payable and other liabilities 293 186
Corporate borrowings 557 335
Non-recourse borrowings 5,101 5,109
Financial liabilities (current and non-current) 88 74
Interest Expense:    
Corporate borrowings 25 14
Non-recourse borrowings $ 1,343 $ 1,450