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Property, plant and equipment, intangible assets, goodwill, right-of-use assets and contract assets - Summary of Intangible Assets (Excluding Goodwill) (Detail) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of detailed information about intangible assets [line items]    
Intangible assets other than goodwill R$ 16,648,681 R$ 16,219,719
Concession rights [member]    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets other than goodwill R$ 15,706,265 15,318,664
Concession rights [member] | Companhia de Gas de Sao Paulo - COMGAS [member]    
Disclosure of detailed information about intangible assets [line items]    
Annual rate of amortization [1] 2.00%  
Intangible assets other than goodwill [1] R$ 8,953,495 8,425,014
Concession rights [member] | Rumo Malha Norte SA [member]    
Disclosure of detailed information about intangible assets [line items]    
Annual rate of amortization [2] 1.59%  
Intangible assets other than goodwill [2] R$ 6,752,770 6,893,650
Operating license [member]    
Disclosure of detailed information about intangible assets [line items]    
Annual rate of amortization 3.70%  
Intangible assets other than goodwill R$ 211,895 187,899
Trademarks [member] | Comma [member]    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets other than goodwill 57,439 54,207
Customer-related intangible assets [member]    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets other than goodwill R$ 575,459 519,915
Customer-related intangible assets [member] | Companhia de Gas de Sao Paulo - COMGAS [member]    
Disclosure of detailed information about intangible assets [line items]    
Annual rate of amortization 20.00%  
Intangible assets other than goodwill R$ 276,811 210,038
Customer-related intangible assets [member] | Moove cash generating unit [member]    
Disclosure of detailed information about intangible assets [line items]    
Annual rate of amortization 6.00%  
Intangible assets other than goodwill R$ 297,286 309,877
Customer-related intangible assets [member] | Other    
Disclosure of detailed information about intangible assets [line items]    
Annual rate of amortization 20.00%  
Intangible assets other than goodwill R$ 1,362
Computer software [member]    
Disclosure of detailed information about intangible assets [line items]    
Annual rate of amortization 20.00%  
Intangible assets other than goodwill R$ 46,770 86,090
Other [member] | Mobil [member]    
Disclosure of detailed information about intangible assets [line items]    
Annual rate of amortization 20.00%  
Intangible assets other than goodwill R$ 50,853 52,944
Other [member]    
Disclosure of detailed information about intangible assets [line items]    
Intangible assets other than goodwill R$ 97,623 R$ 139,034
[1] Refers to the intangible asset for the public gas distribution service concession, which represents the right to charge users for the supply of gas, comprised of: (i) the concession rights recognized in the business combination and (ii) concession assets.
[2] Refers to the railroad concession right agreement of Rumo. The amount will be amortized until the end of the concession in 2079.