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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, 2019
Dec. 31, 2018
Fair value estimate    
Financial assets $ 17,193 $ 13,727
Financial liabilities 25,971 23,459
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 2,101 1,342
Financial liabilities 3,510 2,387
Fair value measurement | Short-term investments    
Fair value estimate    
Financial assets 826 32
Fair value measurement | Derivative financial instruments    
Fair value estimate    
Financial assets 472 431
Fair value measurement | Accounts receivable    
Fair value estimate    
Financial assets 77 (108)
Fair value measurement | Investments in equity securities    
Fair value estimate    
Financial assets 726 987
Derivative financial instruments | Fair value measurement    
Fair value estimate    
Financial liabilities 401 814
Participative stockholders' debentures | Fair value measurement    
Fair value estimate    
Financial liabilities 2,584 1,407
Financial guarantees | Fair value measurement    
Fair value estimate    
Financial liabilities 525 166
Level 1 | Fair value measurement    
Fair value estimate    
Financial assets 1,552 1,019
Level 1 | Fair value measurement | Short-term investments    
Fair value estimate    
Financial assets 826 32
Level 1 | Fair value measurement | Investments in equity securities    
Fair value estimate    
Financial assets 726 987
Level 2 | Fair value measurement    
Fair value estimate    
Financial assets 525 28
Financial liabilities 3,390 2,209
Level 2 | Fair value measurement | Derivative financial instruments    
Fair value estimate    
Financial assets 448 136
Level 2 | Fair value measurement | Accounts receivable    
Fair value estimate    
Financial assets 77 (108)
Level 2 | Derivative financial instruments | Fair value measurement    
Fair value estimate    
Financial liabilities 281 636
Level 2 | Participative stockholders' debentures | Fair value measurement    
Fair value estimate    
Financial liabilities 2,584 1,407
Level 2 | Financial guarantees | Fair value measurement    
Fair value estimate    
Financial liabilities 525 166
Level 3 | Fair value measurement    
Fair value estimate    
Financial assets 24 295
Financial liabilities 120 178
Level 3 | Fair value measurement | Derivative financial instruments    
Fair value estimate    
Financial assets 24 295
Level 3 | Derivative financial instruments | Fair value measurement    
Fair value estimate    
Financial liabilities $ 120 $ 178