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Fair value estimate - Assets and liabilities measured and recognized at fair value (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Fair value estimate    
Financial assets $ 12,011 $ 12,182
Financial liabilities 23,293 30,410
Transfers from level 1 to 2 assets 0  
Transfers from level 2 to 1 assets 0  
Transfers from level 1 to 2 liabilities 0  
Transfers from level 2 to 1 liabilities 0  
Transfers in to level 3 0  
Transfers out of level 3 0  
Fair value measurement    
Fair value estimate    
Financial assets 1,342 729
Financial liabilities 2,221 2,023
Fair value measurement | Financial investments    
Fair value estimate    
Financial assets 32  
Fair value measurement | Derivative financial instruments    
Fair value estimate    
Financial assets 431 559
Fair value measurement | Accounts receivable    
Fair value estimate    
Financial assets (108) 170
Fair value measurement | Investments in equity securities    
Fair value estimate    
Financial assets 987  
Derivative financial instruments | Fair value measurement    
Fair value estimate    
Financial liabilities 814 790
Participative stockholders' debentures | Fair value measurement    
Fair value estimate    
Financial liabilities 1,407 1,233
Level 1 | Fair value measurement    
Fair value estimate    
Financial assets 1,019  
Level 1 | Fair value measurement | Financial investments    
Fair value estimate    
Financial assets 32  
Level 1 | Fair value measurement | Investments in equity securities    
Fair value estimate    
Financial assets 987  
Level 2 | Fair value measurement    
Fair value estimate    
Financial assets 28 459
Financial liabilities 2,043 1,814
Level 2 | Fair value measurement | Derivative financial instruments    
Fair value estimate    
Financial assets 136 289
Level 2 | Fair value measurement | Accounts receivable    
Fair value estimate    
Financial assets (108) 170
Level 2 | Derivative financial instruments | Fair value measurement    
Fair value estimate    
Financial liabilities 636 581
Level 2 | Participative stockholders' debentures | Fair value measurement    
Fair value estimate    
Financial liabilities 1,407 1,233
Level 3 | Fair value measurement    
Fair value estimate    
Financial assets 295 270
Financial liabilities 178 209
Level 3 | Fair value measurement | Derivative financial instruments    
Fair value estimate    
Financial assets 295 270
Level 3 | Derivative financial instruments | Fair value measurement    
Fair value estimate    
Financial liabilities $ 178 $ 209