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Intangible Assets - Balance and changes in intangible assets (Detail) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Summary of intangible assets [line items]      
Intangible assets, beginning R$ 1,762,593 R$ 2,369,355 R$ 2,238,042
Intangible assets, additions 310,412 (441,748) 237,593
Intangible assets, amortization (182,681) (120,492) (99,334)
Intangible assets, transfer (65) (6,442) (1,424)
Intangible assets, write-offs and disposals (128,545) (920) (15,487)
Intangible assets, effect of foreign currency exchange rate variation 20,941 2,788 9,168
Intangible assets, oxiteno andian   (20)  
Intangible assets opening balance TEAS     797
Intangible assets, ending balance 1,782,655 1,762,593 2,369,355
Decarbonization credits [member]      
Summary of intangible assets [line items]      
Intangible assets, additions 125,345    
Intangible assets, transfer (1,058)    
Intangible assets, write-offs and disposals (124,287)    
Previously stated [member]      
Summary of intangible assets [line items]      
Intangible assets, beginning   2,369,355  
Intangible assets, ending balance     2,369,355
Increase (decrease) due to application of IFRS 16 [member]      
Summary of intangible assets [line items]      
Intangible assets, IFRS 16   (39,928)  
Cost [member]      
Summary of intangible assets [line items]      
Intangible assets, beginning 3,191,963 3,105,856 2,876,574
Intangible assets, additions 310,412 151,997 237,593
Intangible assets, transfer (65) (10,098) (1,608)
Intangible assets, write-offs and disposals (138,854) (3,187) (17,555)
Intangible assets, effect of foreign currency exchange rate variation 25,346 3,790 10,006
Intangible assets, oxiteno andian   (281)  
Intangible assets opening balance TEAS     846
Intangible assets, ending balance 3,388,802 3,191,963 3,105,856
Cost [member] | Goodwill [member]      
Summary of intangible assets [line items]      
Intangible assets, beginning 1,525,088 1,525,088 1,524,291
Intangible assets opening balance TEAS     797
Intangible assets, ending balance R$ 1,525,088 R$ 1,525,088 R$ 1,525,088
Cost [member] | Software [member]      
Summary of intangible assets [line items]      
Weighted average useful life (years) 4 years 3 years 5 years
Intangible assets, beginning R$ 1,210,529 R$ 1,062,486 R$ 853,079
Intangible assets, additions 184,027 145,004 223,964
Intangible assets, transfer 993 2,553 (1,258)
Intangible assets, write-offs and disposals (6,633) (784) (15,401)
Intangible assets, effect of foreign currency exchange rate variation 6,130 1,551 2,053
Intangible assets, oxiteno andian   (281)  
Intangible assets opening balance TEAS     49
Intangible assets, ending balance 1,395,046 R$ 1,210,529 R$ 1,062,486
Cost [member] | Technology [member]      
Summary of intangible assets [line items]      
Weighted average useful life (years)   5 years 5 years
Intangible assets, beginning 32,617 R$ 32,617 R$ 32,617
Intangible assets, ending balance 32,617 R$ 32,617 R$ 32,617
Cost [member] | Commercial property rights [member]      
Summary of intangible assets [line items]      
Weighted average useful life (years)   10 years 10 years
Intangible assets, beginning 7,934 R$ 64,032 R$ 55,069
Intangible assets, additions   3,820 11,117
Intangible assets, transfer   (1,401)  
Intangible assets, write-offs and disposals R$ (7,934) (2,403) (2,154)
Intangible assets, ending balance   R$ 7,934 R$ 64,032
Cost [member] | Distribution rights asset [member]      
Summary of intangible assets [line items]      
Weighted average useful life (years) 10 years 6 years 8 years
Intangible assets, beginning R$ 133,599 R$ 142,989 R$ 142,669
Intangible assets, additions   1,505 690
Intangible assets, transfer   (10,895) (350)
Intangible assets, effect of foreign currency exchange rate variation     (20)
Intangible assets, ending balance 133,599 133,599 142,989
Cost [member] | Brands [member]      
Summary of intangible assets [line items]      
Intangible assets, beginning 122,504 120,571 113,543
Intangible assets, effect of foreign currency exchange rate variation 14,458 1,933 7,028
Intangible assets, ending balance R$ 136,962 R$ 122,504 R$ 120,571
Cost [member] | Trademark rights [member]      
Summary of intangible assets [line items]      
Weighted average useful life (years) 39 years 35 years 39 years
Intangible assets, beginning R$ 114,792 R$ 114,792 R$ 114,792
Intangible assets, ending balance R$ 114,792 R$ 114,792 R$ 114,792
Cost [member] | Others [member]      
Summary of intangible assets [line items]      
Weighted average useful life (years) 10 years 10 years 10 years
Intangible assets, beginning R$ 44,900 R$ 43,281 R$ 40,514
Intangible assets, additions 1,040 1,668 1,822
Intangible assets, transfer   (355)  
Intangible assets, effect of foreign currency exchange rate variation 4,758 306 945
Intangible assets, ending balance 50,698 44,900 43,281
Cost [member] | Previously stated [member]      
Summary of intangible assets [line items]      
Intangible assets, beginning   3,105,856  
Intangible assets, ending balance     3,105,856
Cost [member] | Previously stated [member] | Goodwill [member]      
Summary of intangible assets [line items]      
Intangible assets, beginning   1,525,088  
Intangible assets, ending balance     1,525,088
Cost [member] | Previously stated [member] | Software [member]      
Summary of intangible assets [line items]      
Intangible assets, beginning   1,062,486  
Intangible assets, ending balance     1,062,486
Cost [member] | Previously stated [member] | Technology [member]      
Summary of intangible assets [line items]      
Intangible assets, beginning   32,617  
Intangible assets, ending balance     32,617
Cost [member] | Previously stated [member] | Commercial property rights [member]      
Summary of intangible assets [line items]      
Intangible assets, beginning   64,032  
Intangible assets, ending balance     64,032
Cost [member] | Previously stated [member] | Distribution rights asset [member]      
Summary of intangible assets [line items]      
Intangible assets, beginning   142,989  
Intangible assets, ending balance     142,989
Cost [member] | Previously stated [member] | Brands [member]      
Summary of intangible assets [line items]      
Intangible assets, beginning   120,571  
Intangible assets, ending balance     120,571
Cost [member] | Previously stated [member] | Trademark rights [member]      
Summary of intangible assets [line items]      
Intangible assets, beginning   114,792  
Intangible assets, ending balance     114,792
Cost [member] | Previously stated [member] | Others [member]      
Summary of intangible assets [line items]      
Intangible assets, beginning   43,281  
Intangible assets, ending balance     43,281
Cost [member] | Increase (decrease) due to application of IFRS 16 [member]      
Summary of intangible assets [line items]      
Intangible assets, IFRS 16   (56,114)  
Cost [member] | Increase (decrease) due to application of IFRS 16 [member] | Commercial property rights [member]      
Summary of intangible assets [line items]      
Intangible assets, IFRS 16   (56,114)  
Accumulated amortization [member]      
Summary of intangible assets [line items]      
Intangible assets, beginning (835,625) (736,501) (638,532)
Intangible assets, amortization (182,681) (120,492) (99,334)
Intangible assets, transfer   3,656 184
Intangible assets, write-offs and disposals 9,844 2,267 2,068
Intangible assets, effect of foreign currency exchange rate variation (4,405) (1,002) (838)
Intangible assets, oxiteno andian   261  
Intangible assets opening balance TEAS     (49)
Intangible assets, ending balance (1,012,867) (835,625) (736,501)
Accumulated amortization [member] | Software [member]      
Summary of intangible assets [line items]      
Intangible assets, beginning (648,861) (537,438) (456,799)
Intangible assets, amortization (175,144) (110,088) (79,845)
Intangible assets, transfer   13 59
Intangible assets, write-offs and disposals 3,375 (611) 28
Intangible assets, effect of foreign currency exchange rate variation (4,394) (998) (832)
Intangible assets, oxiteno andian   261  
Intangible assets opening balance TEAS     (49)
Intangible assets, ending balance (825,024) (648,861) (537,438)
Accumulated amortization [member] | Technology [member]      
Summary of intangible assets [line items]      
Intangible assets, beginning (32,616) (32,613) (32,541)
Intangible assets, amortization   (3) (72)
Intangible assets, ending balance (32,616) (32,616) (32,613)
Accumulated amortization [member] | Commercial property rights [member]      
Summary of intangible assets [line items]      
Intangible assets, beginning (6,384) (23,931) (21,292)
Intangible assets, amortization (85) (848) (4,679)
Intangible assets, transfer   (669)  
Intangible assets, write-offs and disposals 6,469 2,878 2,040
Intangible assets, ending balance   (6,384) (23,931)
Accumulated amortization [member] | Distribution rights asset [member]      
Summary of intangible assets [line items]      
Intangible assets, beginning (108,932) (106,597) (96,704)
Intangible assets, amortization (4,394) (6,511) (10,018)
Intangible assets, transfer   4,176 125
Intangible assets, ending balance (113,326) (108,932) (106,597)
Accumulated amortization [member] | Trademark rights [member]      
Summary of intangible assets [line items]      
Intangible assets, beginning (6,119) (3,182)  
Intangible assets, amortization (2,937) (2,937) (3,182)
Intangible assets, ending balance (9,056) (6,119) (3,182)
Accumulated amortization [member] | Others [member]      
Summary of intangible assets [line items]      
Intangible assets, beginning (32,713) (32,740) (31,196)
Intangible assets, amortization (121) (105) (1,538)
Intangible assets, transfer   136  
Intangible assets, effect of foreign currency exchange rate variation (11) (4) (6)
Intangible assets, ending balance (32,845) (32,713) (32,740)
Accumulated amortization [member] | Previously stated [member]      
Summary of intangible assets [line items]      
Intangible assets, beginning   (736,501)  
Intangible assets, ending balance     (736,501)
Accumulated amortization [member] | Previously stated [member] | Software [member]      
Summary of intangible assets [line items]      
Intangible assets, beginning   (537,438)  
Intangible assets, ending balance     (537,438)
Accumulated amortization [member] | Previously stated [member] | Technology [member]      
Summary of intangible assets [line items]      
Intangible assets, beginning   (32,613)  
Intangible assets, ending balance     (32,613)
Accumulated amortization [member] | Previously stated [member] | Commercial property rights [member]      
Summary of intangible assets [line items]      
Intangible assets, beginning   (23,931)  
Intangible assets, ending balance     (23,931)
Accumulated amortization [member] | Previously stated [member] | Distribution rights asset [member]      
Summary of intangible assets [line items]      
Intangible assets, beginning   (106,597)  
Intangible assets, ending balance     (106,597)
Accumulated amortization [member] | Previously stated [member] | Trademark rights [member]      
Summary of intangible assets [line items]      
Intangible assets, beginning   (3,182)  
Intangible assets, ending balance     (3,182)
Accumulated amortization [member] | Previously stated [member] | Others [member]      
Summary of intangible assets [line items]      
Intangible assets, beginning   (32,740)  
Intangible assets, ending balance     R$ (32,740)
Accumulated amortization [member] | Increase (decrease) due to application of IFRS 16 [member]      
Summary of intangible assets [line items]      
Intangible assets, IFRS 16   16,186  
Accumulated amortization [member] | Increase (decrease) due to application of IFRS 16 [member] | Commercial property rights [member]      
Summary of intangible assets [line items]      
Intangible assets, IFRS 16   16,186  
Provision for losses and impairment [member]      
Summary of intangible assets [line items]      
Intangible assets, beginning (593,745)    
Intangible assets, additions   (593,745)  
Intangible assets, write-offs and disposals 465    
Intangible assets, ending balance (593,280) (593,745)  
Provision for losses and impairment [member] | Goodwill [member]      
Summary of intangible assets [line items]      
Intangible assets, beginning (593,280)    
Intangible assets, additions   (593,280)  
Intangible assets, ending balance (593,280) (593,280)  
Provision for losses and impairment [member] | Commercial property rights [member]      
Summary of intangible assets [line items]      
Intangible assets, beginning (465)    
Intangible assets, additions   (465)  
Intangible assets, write-offs and disposals R$ 465    
Intangible assets, ending balance   R$ (465)