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Related parties - Outstanding balances with related parties (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Outstanding balances with related parties    
Cash and cash equivalents $ 2,082 $ 1,384
Accounts receivable 156 118
Dividends receivable 19 89
Loans 1,118 1,919
Derivatives financial instruments 2 42
Other assets 70 65
Supplier and contractors 166 367
Loans 2,377 3,055
Derivatives financial instruments 242 64
Other liabilities 235 569
Joint Ventures    
Outstanding balances with related parties    
Accounts receivable 109 91
Dividends receivable 19 83
Loans 1,118 1,919
Other assets 68 65
Supplier and contractors 121 302
Other liabilities 235 569
Associates    
Outstanding balances with related parties    
Accounts receivable 45 22
Dividends receivable   6
Other assets 2  
Supplier and contractors 10 28
Loans 1,433 1,367
Major Stockholders    
Outstanding balances with related parties    
Cash and cash equivalents 2,082 1,384
Accounts receivable 2 5
Derivatives financial instruments 2 42
Supplier and contractors 35 37
Loans 944 1,688
Derivatives financial instruments $ 242 $ 64