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FINANCIAL RISK MANAGEMENT - Maturity Analysis of Financial Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Accounts payable and other liabilities $ 2,745 $ 1,873
Corporate borrowings 3,173 2,475
Non-recourse borrowings 20,177 18,676
Financial liabilities 3,374 2,173
Lease liabilities 4,858 2,795
Interest Expense:    
Corporate borrowings 477 436
Non-recourse borrowings 6,226 5,620
Less than 1 year    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Accounts payable and other liabilities 2,346 1,626
Corporate borrowings 0 0
Non-recourse borrowings 1,052 1,405
Financial liabilities 696 327
Lease liabilities 279 223
Interest Expense:    
Corporate borrowings 72 74
Non-recourse borrowings 853 715
1-2 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Accounts payable and other liabilities 27 29
Corporate borrowings 0 0
Non-recourse borrowings 881 1,019
Financial liabilities 1,138 293
Lease liabilities 247 194
Interest Expense:    
Corporate borrowings 72 74
Non-recourse borrowings 811 660
Later than two years and not later than five years [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Accounts payable and other liabilities 71 31
Corporate borrowings 1,681 1,705
Non-recourse borrowings 8,336 7,110
Financial liabilities 350 1,080
Lease liabilities 647 475
Interest Expense:    
Corporate borrowings 163 165
Non-recourse borrowings 1,970 1,762
5 plus years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Accounts payable and other liabilities 301 187
Corporate borrowings 1,492 770
Non-recourse borrowings 9,908 9,142
Financial liabilities 1,190 473
Lease liabilities 3,685 1,903
Interest Expense:    
Corporate borrowings 170 123
Non-recourse borrowings $ 2,592 $ 2,483