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FAIR VALUE OF FINANCIAL INSTRUMENTS - Allocation of Financial Instruments (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure of financial assets [line items]    
Financial assets $ 4,305 $ 3,931
Disclosure of financial liabilities [line items]    
Financial liabilities 33,120 26,888
Fair value through profit or loss    
Disclosure of financial liabilities [line items]    
Financial liabilities 931 490
Fair value through OCI    
Disclosure of financial liabilities [line items]    
Financial liabilities 0 0
Amortized Cost    
Disclosure of financial liabilities [line items]    
Financial liabilities 32,189 26,398
Fair value through profit or loss    
Disclosure of financial assets [line items]    
Financial assets 846 962
Fair value through OCI    
Disclosure of financial assets [line items]    
Financial assets 239 89
Amortized Cost    
Disclosure of financial assets [line items]    
Financial assets 3,220 2,880
Corporate borrowings    
Disclosure of financial liabilities [line items]    
Financial liabilities 3,158 2,475
Corporate borrowings | Fair value through profit or loss    
Disclosure of financial liabilities [line items]    
Financial liabilities 0 0
Corporate borrowings | Fair value through OCI    
Disclosure of financial liabilities [line items]    
Financial liabilities 0 0
Corporate borrowings | Amortized Cost    
Disclosure of financial liabilities [line items]    
Financial liabilities 3,158 2,475
Non-recourse borrowings (current and non-current)    
Disclosure of financial liabilities [line items]    
Financial liabilities 20,020 18,544
Non-recourse borrowings (current and non-current) | Fair value through profit or loss    
Disclosure of financial liabilities [line items]    
Financial liabilities 0 0
Non-recourse borrowings (current and non-current) | Fair value through OCI    
Disclosure of financial liabilities [line items]    
Financial liabilities 0 0
Non-recourse borrowings (current and non-current) | Amortized Cost    
Disclosure of financial liabilities [line items]    
Financial liabilities 20,020 18,544
Accounts payable and other    
Disclosure of financial liabilities [line items]    
Financial liabilities 6,548 3,676
Accounts payable and other | Fair value through profit or loss    
Disclosure of financial liabilities [line items]    
Financial liabilities 0 0
Accounts payable and other | Fair value through OCI    
Disclosure of financial liabilities [line items]    
Financial liabilities 0 0
Accounts payable and other | Amortized Cost    
Disclosure of financial liabilities [line items]    
Financial liabilities 6,548 3,676
Financial Liabilities    
Disclosure of financial liabilities [line items]    
Financial liabilities 3,374 2,173
Financial Liabilities | Fair value through profit or loss    
Disclosure of financial liabilities [line items]    
Financial liabilities 931 490
Financial Liabilities | Fair value through OCI    
Disclosure of financial liabilities [line items]    
Financial liabilities 0 0
Financial Liabilities | Amortized Cost    
Disclosure of financial liabilities [line items]    
Financial liabilities 2,443 1,683
Preferred shares    
Disclosure of financial liabilities [line items]    
Financial liabilities 20 20
Preferred shares | Fair value through profit or loss    
Disclosure of financial liabilities [line items]    
Financial liabilities 0 0
Preferred shares | Fair value through OCI    
Disclosure of financial liabilities [line items]    
Financial liabilities 0 0
Preferred shares | Amortized Cost    
Disclosure of financial liabilities [line items]    
Financial liabilities 20 20
Cash and cash equivalents    
Disclosure of financial assets [line items]    
Financial assets 867 827
Cash and cash equivalents | Fair value through profit or loss    
Disclosure of financial assets [line items]    
Financial assets 0 0
Cash and cash equivalents | Fair value through OCI    
Disclosure of financial assets [line items]    
Financial assets 0 0
Cash and cash equivalents | Amortized Cost    
Disclosure of financial assets [line items]    
Financial assets 867 827
Accounts receivable and other    
Disclosure of financial assets [line items]    
Financial assets 2,031 1,909
Accounts receivable and other | Fair value through profit or loss    
Disclosure of financial assets [line items]    
Financial assets 0 0
Accounts receivable and other | Fair value through OCI    
Disclosure of financial assets [line items]    
Financial assets 0 0
Accounts receivable and other | Amortized Cost    
Disclosure of financial assets [line items]    
Financial assets 2,031 1,909
Financial assets (current and non-current)    
Disclosure of financial assets [line items]    
Financial assets 881 1,053
Financial assets (current and non-current) | Fair value through profit or loss    
Disclosure of financial assets [line items]    
Financial assets 523 893
Financial assets (current and non-current) | Fair value through OCI    
Disclosure of financial assets [line items]    
Financial assets 36 16
Financial assets (current and non-current) | Amortized Cost    
Disclosure of financial assets [line items]    
Financial assets 322 144
Marketable securities    
Disclosure of financial assets [line items]    
Financial assets 526 142
Marketable securities | Fair value through profit or loss    
Disclosure of financial assets [line items]    
Financial assets 323 69
Marketable securities | Fair value through OCI    
Disclosure of financial assets [line items]    
Financial assets 203 73
Marketable securities | Amortized Cost    
Disclosure of financial assets [line items]    
Financial assets $ 0 $ 0