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Financial assets and liabilities - Summary of Financial Liabilities (Detail) - Liquidity risk [member] - BRL (R$)
R$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities R$ (73,146,801) R$ (61,713,570)
Up to 1 year [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities (12,631,238)  
From 1 to 2 years [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities (7,248,171)  
3 - 5 years [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities (12,077,426)  
More than 5 years [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities (41,189,966)  
Loans, borrowings and debentures [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities (57,375,287) (46,012,176)
Loans, borrowings and debentures [member] | Up to 1 year [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities (5,845,774)  
Loans, borrowings and debentures [member] | From 1 to 2 years [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities (6,628,072)  
Loans, borrowings and debentures [member] | 3 - 5 years [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities (12,124,037)  
Loans, borrowings and debentures [member] | More than 5 years [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities (32,777,404)  
Trade payables [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities (3,253,504) (2,629,734)
Trade payables [member] | Up to 1 year [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities (3,253,504)  
Trade payables [member] | From 1 to 2 years [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities  
Trade payables [member] | 3 - 5 years [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities  
Trade payables [member] | More than 5 years [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities  
Other financial liabilities [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities (726,423) (562,763)
Other financial liabilities [member] | Up to 1 year [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities (726,423)  
Other financial liabilities [member] | From 1 to 2 years [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities  
Other financial liabilities [member] | 3 - 5 years [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities  
Other financial liabilities [member] | More than 5 years [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities  
REFIS [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities (200,664) (203,222)
REFIS [member] | Up to 1 year [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities (52,805)  
REFIS [member] | From 1 to 2 years [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities (3,453)  
REFIS [member] | 3 - 5 years [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities (1,395)  
REFIS [member] | More than 5 years [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities (143,011)  
Leases [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities (15,631,812) (14,348,296)
Leases [member] | Up to 1 year [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities (413,310)  
Leases [member] | From 1 to 2 years [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities (413,692)  
Leases [member] | 3 - 5 years [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities (1,133,476)  
Leases [member] | More than 5 years [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities (13,671,334)  
Railway Concession Payable under Litigation [Member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities (1,185,076) (1,219,188)
Railway Concession Payable under Litigation [Member] | Up to 1 year [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities (187,972)  
Railway Concession Payable under Litigation [Member] | From 1 to 2 years [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities (201,876)  
Railway Concession Payable under Litigation [Member] | 3 - 5 years [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities (198,532)  
Railway Concession Payable under Litigation [Member] | More than 5 years [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities (596,696)  
Payables to related parties [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities (287,609) (315,433)
Payables to related parties [member] | Up to 1 year [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities (287,609)  
Payables to related parties [member] | From 1 to 2 years [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities  
Payables to related parties [member] | 3 - 5 years [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities  
Payables to related parties [member] | More than 5 years [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities  
Dividends payable [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities (799,634) (24,238)
Dividends payable [member] | Up to 1 year [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities (799,634)  
Dividends payable [member] | From 1 to 2 years [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities  
Dividends payable [member] | 3 - 5 years [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities  
Dividends payable [member] | More than 5 years [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities  
Derivative financial instruments [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities 6,313,208 3,988,524
Derivative financial instruments [member] | Up to 1 year [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities (1,064,207)  
Derivative financial instruments [member] | From 1 to 2 years [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities (1,078)  
Derivative financial instruments [member] | 3 - 5 years [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities 1,380,014  
Derivative financial instruments [member] | More than 5 years [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities 5,998,479  
Preferred shareholders payable in subsidiaries [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities R$ (387,044)
Preferred shareholders payable in subsidiaries [member] | Up to 1 year [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities  
Preferred shareholders payable in subsidiaries [member] | From 1 to 2 years [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities  
Preferred shareholders payable in subsidiaries [member] | 3 - 5 years [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities  
Preferred shareholders payable in subsidiaries [member] | More than 5 years [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities