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FAIR VALUE OF FINANCIAL INSTRUMENTS - Allocation of Financial Instruments (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Disclosure of financial assets [line items]    
Financial assets $ 5,156 $ 4,305
Disclosure of financial liabilities [line items]    
Financial liabilities 31,397 33,120
FVTPL (Fair Value)    
Disclosure of financial liabilities [line items]    
Financial liabilities 641 931
Available for sale securities (Fair Value through OCI)    
Disclosure of financial liabilities [line items]    
Financial liabilities 0 0
Loans and Receivables/Other Liabilities (Amortized Cost)    
Disclosure of financial liabilities [line items]    
Financial liabilities 30,756 32,189
FVTPL (Fair Value)    
Disclosure of financial assets [line items]    
Financial assets 974 846
Available for sale securities (Fair Value through OCI)    
Disclosure of financial assets [line items]    
Financial assets 295 239
Loans and Receivables/Other Liabilities (Amortized Cost)    
Disclosure of financial assets [line items]    
Financial assets 3,887 3,220
Corporate borrowings    
Disclosure of financial liabilities [line items]    
Financial liabilities 2,822 3,158
Corporate borrowings | FVTPL (Fair Value)    
Disclosure of financial liabilities [line items]    
Financial liabilities 0 0
Corporate borrowings | Available for sale securities (Fair Value through OCI)    
Disclosure of financial liabilities [line items]    
Financial liabilities 0 0
Corporate borrowings | Loans and Receivables/Other Liabilities (Amortized Cost)    
Disclosure of financial liabilities [line items]    
Financial liabilities 2,822 3,158
Non-recourse borrowings (current and non-current)    
Disclosure of financial liabilities [line items]    
Financial liabilities 19,999 20,020
Non-recourse borrowings (current and non-current) | FVTPL (Fair Value)    
Disclosure of financial liabilities [line items]    
Financial liabilities 0 0
Non-recourse borrowings (current and non-current) | Available for sale securities (Fair Value through OCI)    
Disclosure of financial liabilities [line items]    
Financial liabilities 0 0
Non-recourse borrowings (current and non-current) | Loans and Receivables/Other Liabilities (Amortized Cost)    
Disclosure of financial liabilities [line items]    
Financial liabilities 19,999 20,020
Accounts payable and other    
Disclosure of financial liabilities [line items]    
Financial liabilities 2,201 2,745
Accounts payable and other | FVTPL (Fair Value)    
Disclosure of financial liabilities [line items]    
Financial liabilities 0 0
Accounts payable and other | Available for sale securities (Fair Value through OCI)    
Disclosure of financial liabilities [line items]    
Financial liabilities 0 0
Accounts payable and other | Loans and Receivables/Other Liabilities (Amortized Cost)    
Disclosure of financial liabilities [line items]    
Financial liabilities 2,201 2,745
Financial liabilities (current and non-current)    
Disclosure of financial liabilities [line items]    
Financial liabilities 2,894 3,374
Financial liabilities (current and non-current) | FVTPL (Fair Value)    
Disclosure of financial liabilities [line items]    
Financial liabilities 641 931
Financial liabilities (current and non-current) | Available for sale securities (Fair Value through OCI)    
Disclosure of financial liabilities [line items]    
Financial liabilities 0 0
Financial liabilities (current and non-current) | Loans and Receivables/Other Liabilities (Amortized Cost)    
Disclosure of financial liabilities [line items]    
Financial liabilities 2,253 2,443
Lease liabilities [member]    
Disclosure of financial liabilities [line items]    
Financial liabilities 3,461 3,803
Lease liabilities [member] | FVTPL (Fair Value)    
Disclosure of financial liabilities [line items]    
Financial liabilities 0 0
Lease liabilities [member] | Available for sale securities (Fair Value through OCI)    
Disclosure of financial liabilities [line items]    
Financial liabilities 0 0
Lease liabilities [member] | Loans and Receivables/Other Liabilities (Amortized Cost)    
Disclosure of financial liabilities [line items]    
Financial liabilities 3,461 3,803
Preferred shares    
Disclosure of financial liabilities [line items]    
Financial liabilities 20 20
Preferred shares | FVTPL (Fair Value)    
Disclosure of financial liabilities [line items]    
Financial liabilities 0 0
Preferred shares | Available for sale securities (Fair Value through OCI)    
Disclosure of financial liabilities [line items]    
Financial liabilities 0 0
Preferred shares | Loans and Receivables/Other Liabilities (Amortized Cost)    
Disclosure of financial liabilities [line items]    
Financial liabilities 20 20
Cash and cash equivalents    
Disclosure of financial assets [line items]    
Financial assets 1,275 867
Cash and cash equivalents | FVTPL (Fair Value)    
Disclosure of financial assets [line items]    
Financial assets 0 0
Cash and cash equivalents | Available for sale securities (Fair Value through OCI)    
Disclosure of financial assets [line items]    
Financial assets 0 0
Cash and cash equivalents | Loans and Receivables/Other Liabilities (Amortized Cost)    
Disclosure of financial assets [line items]    
Financial assets 1,275 867
Accounts receivable and other    
Disclosure of financial assets [line items]    
Financial assets 2,275 2,031
Accounts receivable and other | FVTPL (Fair Value)    
Disclosure of financial assets [line items]    
Financial assets 0 0
Accounts receivable and other | Available for sale securities (Fair Value through OCI)    
Disclosure of financial assets [line items]    
Financial assets 0 0
Accounts receivable and other | Loans and Receivables/Other Liabilities (Amortized Cost)    
Disclosure of financial assets [line items]    
Financial assets 2,275 2,031
Financial assets (current and non-current)    
Disclosure of financial assets [line items]    
Financial assets 919 881
Financial assets (current and non-current) | FVTPL (Fair Value)    
Disclosure of financial assets [line items]    
Financial assets 582 523
Financial assets (current and non-current) | Available for sale securities (Fair Value through OCI)    
Disclosure of financial assets [line items]    
Financial assets 0 36
Financial assets (current and non-current) | Loans and Receivables/Other Liabilities (Amortized Cost)    
Disclosure of financial assets [line items]    
Financial assets 337 322
Marketable securities    
Disclosure of financial assets [line items]    
Financial assets 687 526
Marketable securities | FVTPL (Fair Value)    
Disclosure of financial assets [line items]    
Financial assets 392 323
Marketable securities | Available for sale securities (Fair Value through OCI)    
Disclosure of financial assets [line items]    
Financial assets 295 203
Marketable securities | Loans and Receivables/Other Liabilities (Amortized Cost)    
Disclosure of financial assets [line items]    
Financial assets $ 0 $ 0