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Financial Assets and Liabilities - Schedule of fair value option of financial instruments (Detail) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Foreign Currency Related Hedging Instruments And Interest Rate Swaps [Line Items]      
Loans, financing and debentures R$ (45,659,037) R$ (42,249,460) R$ (29,052,215)
Financial liabilities at fair value through profit or loss, category | Exchange rate Objects | Designated as Hedging Instruments [Member]      
Disclosure Of Foreign Currency Related Hedging Instruments And Interest Rate Swaps [Line Items]      
Notional amount (4,622,898)    
Loans, financing and debentures (5,403,521) (5,272,586)  
Accumulated fair value adjustment of Loans, financing and debentures 303,423 (370,997)  
Notional amount of derivatives (4,622,898)    
Hedging instrument, assets 2,293,143 2,481,493  
Derivative hedging instruments accumulated fair value adjustment 95,408 1,475,951  
Notional amount of hedging instruments    
Net currency and interest rate instruments (3,110,378) (2,791,093)  
Net accumulated fair value adjustment of currency and interest rate instruments R$ 398,831 1,104,954  
Financial liabilities at fair value through profit or loss, category | Exchange rate Objects | Designated as Hedging Instruments [Member] | Swap Notes 2027      
Disclosure Of Foreign Currency Related Hedging Instruments And Interest Rate Swaps [Line Items]      
Borrowings, interest rate basis R$ + <span style="border-left: none; border-right: none;">126.85</span>% do CDI    
Notional amount of derivatives R$ (3,627,325)    
Hedging instrument, assets 2,047,237 2,272,648  
Derivative hedging instruments accumulated fair value adjustment R$ 45,181 1,320,629  
Financial liabilities at fair value through profit or loss, category | Exchange rate Objects | Designated as Hedging Instruments [Member] | Inflation and interest rate swaps, one      
Disclosure Of Foreign Currency Related Hedging Instruments And Interest Rate Swaps [Line Items]      
Borrowings, interest rate basis <span style="color: #000000; font-family: 'times new roman', times; font-size: 13.3333px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; float: none; display: inline !important;">R$</span> + <span style="border-left: none; border-right: none;">107</span>% do CDI    
Notional amount of derivatives R$ (100,198)    
Hedging instrument, assets 30,535  
Derivative hedging instruments accumulated fair value adjustment R$ (3,096)  
Financial liabilities at fair value through profit or loss, category | Exchange rate Objects | Designated as Hedging Instruments [Member] | Inflation and interest rate swaps, two      
Disclosure Of Foreign Currency Related Hedging Instruments And Interest Rate Swaps [Line Items]      
Borrowings, interest rate basis <span style="color: #000000; font-family: 'times new roman', times; font-size: 13.3333px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; float: none; display: inline !important;">R$</span> + <span style="border-left: none; border-right: none;">118</span>% do CDI    
Notional amount of derivatives R$ (220,000)    
Hedging instrument, assets 47,527  
Derivative hedging instruments accumulated fair value adjustment R$ 20,019  
Financial liabilities at fair value through profit or loss, category | Exchange rate Objects | Designated as Hedging Instruments [Member] | EIB 3rd Tranche      
Disclosure Of Foreign Currency Related Hedging Instruments And Interest Rate Swaps [Line Items]      
Borrowings, interest rate basis <span style="color: #000000; font-family: 'times new roman', times; font-size: 13.3333px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; float: none; display: inline !important;">R$</span> + <span style="border-left: none; border-right: none;">88.5</span>% do CDI    
Notional amount of derivatives    
Hedging instrument, assets 21,176  
Derivative hedging instruments accumulated fair value adjustment R$ 844 24,927  
Financial liabilities at fair value through profit or loss, category | Exchange rate Objects | Designated as Hedging Instruments [Member] | EIB 4th Tranche      
Disclosure Of Foreign Currency Related Hedging Instruments And Interest Rate Swaps [Line Items]      
Borrowings, interest rate basis <span style="color: #000000; font-family: 'times new roman', times; font-size: 13.3333px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; float: none; display: inline !important;">R$</span> + <span style="border-left: none; border-right: none;">81.1</span>% do CDI    
Notional amount of derivatives    
Hedging instrument, assets 39,256  
Derivative hedging instruments accumulated fair value adjustment R$ 2,583 26,219  
Financial liabilities at fair value through profit or loss, category | Exchange rate Objects | Designated as Hedging Instruments [Member] | Resolution 4,131 (2018) | Comgas [member]      
Disclosure Of Foreign Currency Related Hedging Instruments And Interest Rate Swaps [Line Items]      
Borrowings, interest rate basis <span style="color: #000000; font-family: 'times new roman', times; font-size: 13.3333px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; float: none; display: inline !important;">R$</span> + <span style="border-left: none; border-right: none;">107.9</span>% do CDI    
Notional amount of derivatives R$ (268,125)    
Hedging instrument, assets 168,358 154,627  
Derivative hedging instruments accumulated fair value adjustment R$ 20,794 117,080  
Financial liabilities at fair value through profit or loss, category | Exchange rate Objects | Designated as Hedging Instruments [Member] | Resolution 4,131 (2020) | Comgas [member]      
Disclosure Of Foreign Currency Related Hedging Instruments And Interest Rate Swaps [Line Items]      
Borrowings, interest rate basis <span style="color: #000000; font-family: 'times new roman', times; font-size: 13.3333px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; float: none; display: inline !important;">R$</span> + CDI + <span style="border-left: none; border-right: none;">2.75</span>%    
Notional amount of derivatives    
Hedging instrument, assets (6,214)  
Derivative hedging instruments accumulated fair value adjustment R$ 15,711 (12,904)  
Financial liabilities at fair value through profit or loss, category | Exchange rate Objects | Designated as Hedging Instruments [Member] | Resolution 4,131 (2021) | Comgas [member]      
Disclosure Of Foreign Currency Related Hedging Instruments And Interest Rate Swaps [Line Items]      
Borrowings, interest rate basis <span style="color: #000000; font-family: 'times new roman', times; font-size: 13.3333px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; float: none; display: inline !important;">R$</span> + CDI + <span style="border-left: none; border-right: none;">1.25</span>%    
Notional amount of derivatives R$ (407,250)    
Hedging instrument, assets (514)  
Derivative hedging instruments accumulated fair value adjustment R$ (6,628)  
Financial liabilities at fair value through profit or loss, category | Exchange rate Objects | Designated as Hedging Instruments [Member] | Senior notes due 2027      
Disclosure Of Foreign Currency Related Hedging Instruments And Interest Rate Swaps [Line Items]      
Borrowings, interest rate basis US$+<span style="border-left: none; border-right: none;">7.0</span>%    
Notional amount R$ (3,627,325)    
Loans, financing and debentures (4,305,928) (4,379,812)  
Accumulated fair value adjustment of Loans, financing and debentures R$ 313,052 (349,181)  
Financial liabilities at fair value through profit or loss, category | Exchange rate Objects | Designated as Hedging Instruments [Member] | Export credit agreement      
Disclosure Of Foreign Currency Related Hedging Instruments And Interest Rate Swaps [Line Items]      
Borrowings, interest rate basis EUR + <span style="border-left: none; border-right: none;">0.58</span>%    
Notional amount R$ (100,198)    
Loans, financing and debentures (95,460)  
Accumulated fair value adjustment of Loans, financing and debentures R$ (1,337)  
Financial liabilities at fair value through profit or loss, category | Exchange rate Objects | Designated as Hedging Instruments [Member] | Resolution 4131      
Disclosure Of Foreign Currency Related Hedging Instruments And Interest Rate Swaps [Line Items]      
Borrowings, interest rate basis US$ + <span style="border-left: none; border-right: none;">2.20</span>%    
Notional amount R$ (220,000)    
Loans, financing and debentures (148,932)  
Accumulated fair value adjustment of Loans, financing and debentures R$ 4,412  
Financial liabilities at fair value through profit or loss, category | Exchange rate Objects | Designated as Hedging Instruments [Member] | EIB 3rd Tranche      
Disclosure Of Foreign Currency Related Hedging Instruments And Interest Rate Swaps [Line Items]      
Borrowings, interest rate basis US$ + <span>LIBOR</span><span>6</span>M + <span>0.54</span>%    
Notional amount    
Loans, financing and debentures (30,817)  
Accumulated fair value adjustment of Loans, financing and debentures 156  
Financial liabilities at fair value through profit or loss, category | Exchange rate Objects | Designated as Hedging Instruments [Member] | EIB 4th Tranche      
Disclosure Of Foreign Currency Related Hedging Instruments And Interest Rate Swaps [Line Items]      
Borrowings, interest rate basis US$ + <span>LIBOR</span><span>6</span>M + <span>0.61</span>%    
Notional amount    
Loans, financing and debentures (57,813)  
Accumulated fair value adjustment of Loans, financing and debentures 308  
Financial liabilities at fair value through profit or loss, category | Exchange rate Objects | Designated as Hedging Instruments [Member] | Resolution 4,131 (2018) | Comgas [member]      
Disclosure Of Foreign Currency Related Hedging Instruments And Interest Rate Swaps [Line Items]      
Borrowings, interest rate basis US$ + <span style="border-left: none; border-right: none;">3.67</span>%    
Notional amount R$ (268,125)    
Loans, financing and debentures (438,823) (415,232)  
Accumulated fair value adjustment of Loans, financing and debentures R$ (18,230) (24,247)  
Financial liabilities at fair value through profit or loss, category | Exchange rate Objects | Designated as Hedging Instruments [Member] | Resolution 4,131 (2020) | Comgas [member]      
Disclosure Of Foreign Currency Related Hedging Instruments And Interest Rate Swaps [Line Items]      
Borrowings, interest rate basis US$ + <span style="border-left: none; border-right: none;">1.59</span>%    
Notional amount    
Loans, financing and debentures (388,912)  
Accumulated fair value adjustment of Loans, financing and debentures 1,967  
Financial liabilities at fair value through profit or loss, category | Exchange rate Objects | Designated as Hedging Instruments [Member] | Resolution 4,131 (2021) | Comgas [member]      
Disclosure Of Foreign Currency Related Hedging Instruments And Interest Rate Swaps [Line Items]      
Borrowings, interest rate basis US$ + <span style="border-left: none; border-right: none;">1.36</span>%    
Notional amount R$ (407,250)    
Loans, financing and debentures (414,378)  
Accumulated fair value adjustment of Loans, financing and debentures 5,526  
Financial liabilities at fair value through profit or loss, category | Interest rate Objects | Designated as Hedging Instruments [Member]      
Disclosure Of Foreign Currency Related Hedging Instruments And Interest Rate Swaps [Line Items]      
Notional amount (1,100,000)    
Loans, financing and debentures (1,220,550)  
Accumulated fair value adjustment of Loans, financing and debentures 213,627  
Notional amount of derivatives (1,100,000)    
Hedging instrument, assets 153,719  
Derivative hedging instruments accumulated fair value adjustment (53,150)  
Notional amount of hedging instruments    
Net currency and interest rate instruments (1,066,831)  
Net accumulated fair value adjustment of currency and interest rate instruments R$ 160,477  
Financial liabilities at fair value through profit or loss, category | Interest rate Objects | Designated as Hedging Instruments [Member] | Foreign exchange and interest swap, one      
Disclosure Of Foreign Currency Related Hedging Instruments And Interest Rate Swaps [Line Items]      
Borrowings, interest rate basis <span style="border-left: none; border-right: none;">107</span>% CDI    
Notional amount of derivatives R$ (500,000)    
Hedging instrument, assets 71,375  
Derivative hedging instruments accumulated fair value adjustment R$ (11,682)  
Financial liabilities at fair value through profit or loss, category | Interest rate Objects | Designated as Hedging Instruments [Member] | Foreign exchange and interest swap, two      
Disclosure Of Foreign Currency Related Hedging Instruments And Interest Rate Swaps [Line Items]      
Borrowings, interest rate basis <span style="border-left: none; border-right: none;">105</span>% CDI    
Notional amount of derivatives R$ (600,000)    
Hedging instrument, assets 82,344  
Derivative hedging instruments accumulated fair value adjustment R$ (41,468)  
Financial liabilities at fair value through profit or loss, category | Interest rate Objects | Designated as Hedging Instruments [Member] | Debenture, one | Rumo S.A. [member]      
Disclosure Of Foreign Currency Related Hedging Instruments And Interest Rate Swaps [Line Items]      
Borrowings, interest rate basis IPCA + <span>4,68</span>%    
Notional amount R$ (500,000)    
Loans, financing and debentures (543,752)  
Accumulated fair value adjustment of Loans, financing and debentures R$ 82,474  
Financial liabilities at fair value through profit or loss, category | Interest rate Objects | Designated as Hedging Instruments [Member] | Debenture, two | Rumo S.A. [member]      
Disclosure Of Foreign Currency Related Hedging Instruments And Interest Rate Swaps [Line Items]      
Borrowings, interest rate basis IPCA + <span style="border-left: none; border-right: none;">4,50</span>%    
Notional amount R$ (600,000)    
Loans, financing and debentures (676,798)  
Accumulated fair value adjustment of Loans, financing and debentures R$ 131,153