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FINANCIAL RISK MANAGEMENT - Maturity Analysis of Financial Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Accounts payable and other liabilities $ 1,352 $ 1,043
Corporate borrowings 1,993 2,101
Non-recourse borrowings, undiscounted cash flows 13,206 8,087
Financial liabilities (current and non-current) 1,280 1,313
Interest Expense:    
Corporate borrowings 386 227
Non-recourse borrowings 4,305 2,936
Less than 1 year    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Accounts payable and other liabilities 1,048 646
Corporate borrowings 0 99
Non-recourse borrowings, undiscounted cash flows 995 372
Financial liabilities (current and non-current) 124 237
Interest Expense:    
Corporate borrowings 67 49
Non-recourse borrowings 595 381
1-2 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Accounts payable and other liabilities 48 45
Corporate borrowings 0 0
Non-recourse borrowings, undiscounted cash flows 794 571
Financial liabilities (current and non-current) 26 58
Interest Expense:    
Corporate borrowings 66 47
Non-recourse borrowings 542 348
2-5 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Accounts payable and other liabilities 36 59
Corporate borrowings 605 1,445
Non-recourse borrowings, undiscounted cash flows 5,127 2,043
Financial liabilities (current and non-current) 1,037 930
Interest Expense:    
Corporate borrowings 178 106
Non-recourse borrowings 1,397 864
5 plus years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Accounts payable and other liabilities 220 293
Corporate borrowings 1,388 557
Non-recourse borrowings, undiscounted cash flows 6,290 5,101
Financial liabilities (current and non-current) 93 88
Interest Expense:    
Corporate borrowings 75 25
Non-recourse borrowings $ 1,771 $ 1,343