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Litigations - Changes (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Changes in provision          
Balance at beginning of the period     $ 3,989    
Balance at end of the period $ 4,021   4,021   $ 3,989
Provisions, current liabilities 1,156   1,156   1,826
Provisions, non-current liabilities 8,003   8,003   8,434
Legal proceedings reserved     442   423
Legal proceedings guaranteed     509   487
Provisions for litigation          
Changes in provision          
Balance at beginning of the period     1,091 $ 1,462 1,462
Additions and reversals, net 28 $ 44 44 63  
Payments     (48) (55)  
Indexation and interest     36 42  
Translation adjustment     47 (368)  
Acquisition of NLC (note 12)     6    
Balance at end of the period 1,176 1,144 1,176 1,144 1,091
Provisions, current liabilities 102 84 102 84 87
Provisions, non-current liabilities 1,074 1,060 1,074 1,060 1,004
Provisions 1,176 1,144 1,176 1,144  
Tax litigation          
Changes in provision          
Balance at beginning of the period     485 696 696
Additions and reversals, net       19  
Additions and reversals, net     (2)    
Payments       (10)  
Indexation and interest     3 13  
Translation adjustment     19 (168)  
Balance at end of the period 505 550 505 550 485
Provisions, current liabilities 9 7 9 7  
Provisions, non-current liabilities 496 543 496 543  
Provisions 505 550 505 550  
Civil litigation          
Changes in provision          
Balance at beginning of the period     260 300 300
Additions and reversals, net       28  
Additions and reversals, net     (1)    
Payments     (15) (11)  
Indexation and interest     10 16  
Translation adjustment     11 (77)  
Acquisition of NLC (note 12)     1    
Balance at end of the period 266 256 266 256 260
Provisions, current liabilities 17 14 17 14  
Provisions, non-current liabilities 249 242 249 242  
Provisions 266 256 266 256  
Labor litigation          
Changes in provision          
Balance at beginning of the period     335 455 455
Additions and reversals, net     46 14  
Payments     (29) (34)  
Indexation and interest     23 13  
Translation adjustment     17 (120)  
Acquisition of NLC (note 12)     5    
Balance at end of the period 397 328 397 328 335
Provisions, current liabilities 76 63 76 63  
Provisions, non-current liabilities 321 265 321 265  
Provisions 397 328 397 328  
Environmental litigation          
Changes in provision          
Balance at beginning of the period     11 11 11
Additions and reversals, net     1 2  
Payments     (4)    
Translation adjustment       (3)  
Balance at end of the period 8 10 8 10 $ 11
Provisions, non-current liabilities 8 10 8 10  
Provisions $ 8 $ 10 $ 8 $ 10