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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
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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 |  |

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