v3.26.1
Borrowings and financing (Details 2)
R$ in Thousands
 12 Months Ended
Dec. 31, 2025
BRL (R$)
IfrsStatementLineItems [Line Items]  
Borrowings and financing, beginning R$ 25,258,297
Additions 541
Funding 18,590,352
Borrowing costs (254,280)
Inflation adjustment and exchange rate changes (24,831)
Inflation adjustment/Exchange rate change - Capitalized 62,028
Interest paid (2,696,320)
Amortization (4,295,849)
Accrued interest 2,612,031
Provision for interest and charges -capitalized 758,185
Expenses with borrowing costs 45,880
Borrowings and financing, ending 40,142,347
Local Currency [Member]  
IfrsStatementLineItems [Line Items]  
Borrowings and financing, beginning 21,901,932
Additions 541
Funding 10,878,114
Borrowing costs (181,591)
Inflation adjustment and exchange rate changes 234,363
Inflation adjustment/Exchange rate change - Capitalized 66,011
Interest paid (2,506,323)
Amortization (4,016,269)
Accrued interest 2,332,136
Provision for interest and charges -capitalized 751,285
Expenses with borrowing costs 39,720
Fair Value 10,176
Borrowings and financing, ending 29,510,095
Local Currency [Member] | Debentures [Member]  
IfrsStatementLineItems [Line Items]  
Borrowings and financing, beginning 12,062,023
Additions
Funding 10,818,600
Borrowing costs (181,512)
Inflation adjustment and exchange rate changes 184,934
Inflation adjustment/Exchange rate change - Capitalized 55,463
Interest paid (1,413,689)
Amortization (2,568,437)
Accrued interest 1,458,664
Provision for interest and charges -capitalized 410,249
Expenses with borrowing costs 31,473
Fair Value 10,176
Borrowings and financing, ending 20,867,944
Local Currency [Member] | Brazilian Federal Savings Banks [Member]  
IfrsStatementLineItems [Line Items]  
Borrowings and financing, beginning 1,688,057
Additions
Funding 59,514
Borrowing costs
Inflation adjustment and exchange rate changes 31,293
Inflation adjustment/Exchange rate change - Capitalized 5,217
Interest paid (129,881)
Amortization (149,610)
Accrued interest 108,808
Provision for interest and charges -capitalized 20,925
Expenses with borrowing costs
Fair Value
Borrowings and financing, ending 1,634,323
Local Currency [Member] | B N D E S [Member]  
IfrsStatementLineItems [Line Items]  
Borrowings and financing, beginning 1,069,075
Additions
Funding
Borrowing costs
Inflation adjustment and exchange rate changes 18,136
Inflation adjustment/Exchange rate change - Capitalized 5,331
Interest paid (73,204)
Amortization (265,714)
Accrued interest 56,058
Provision for interest and charges -capitalized 16,546
Expenses with borrowing costs 352
Fair Value
Borrowings and financing, ending 826,580
Local Currency [Member] | I D B [Member]  
IfrsStatementLineItems [Line Items]  
Borrowings and financing, beginning 3,805,995
Additions
Funding
Borrowing costs (79)
Inflation adjustment and exchange rate changes
Inflation adjustment/Exchange rate change - Capitalized
Interest paid (409,438)
Amortization (702,858)
Accrued interest 283,246
Provision for interest and charges -capitalized 155,002
Expenses with borrowing costs 4,342
Fair Value
Borrowings and financing, ending 3,136,210
Local Currency [Member] | I F C [Member]  
IfrsStatementLineItems [Line Items]  
Borrowings and financing, beginning 2,805,918
Additions
Funding
Borrowing costs
Inflation adjustment and exchange rate changes
Inflation adjustment/Exchange rate change - Capitalized
Interest paid (457,343)
Amortization (44,200)
Accrued interest 311,151
Provision for interest and charges -capitalized 148,526
Expenses with borrowing costs 3,553
Fair Value
Borrowings and financing, ending 2,767,605
Local Currency [Member] | Leases (Concession Agreements, Program Contracts and Contract Assets) [member]  
IfrsStatementLineItems [Line Items]  
Borrowings and financing, beginning 317,144
Additions
Funding
Borrowing costs
Inflation adjustment and exchange rate changes
Inflation adjustment/Exchange rate change - Capitalized
Interest paid (22,710)
Amortization (183,910)
Accrued interest 83,903
Provision for interest and charges -capitalized
Expenses with borrowing costs
Fair Value
Borrowings and financing, ending 194,427
Local Currency [Member] | Leases (Others) [member]  
IfrsStatementLineItems [Line Items]  
Borrowings and financing, beginning 150,924
Additions 541
Funding
Borrowing costs
Inflation adjustment and exchange rate changes
Inflation adjustment/Exchange rate change - Capitalized
Interest paid
Amortization (99,684)
Accrued interest 30,287
Provision for interest and charges -capitalized
Expenses with borrowing costs
Fair Value
Borrowings and financing, ending 82,068
Local Currency [Member] | Other Borrowings [Member]  
IfrsStatementLineItems [Line Items]  
Borrowings and financing, beginning 2,796
Additions
Funding
Borrowing costs
Inflation adjustment and exchange rate changes
Inflation adjustment/Exchange rate change - Capitalized
Interest paid (58)
Amortization (1,856)
Accrued interest 19
Provision for interest and charges -capitalized 37
Expenses with borrowing costs
Borrowings and financing, ending 938
Foreign Currency [Member]  
IfrsStatementLineItems [Line Items]  
Borrowings and financing, beginning 3,356,365
Additions
Funding 7,712,238
Borrowing costs (72,689)
Inflation adjustment and exchange rate changes (259,194)
Interest paid (189,997)
Amortization (279,580)
Accrued interest 279,895
Provision for interest and charges -capitalized 6,900
Expenses with borrowing costs 6,160
Fair Value 76,137
Borrowings and financing, ending 10,632,252
Inflation adjustment/Exchange rate change - Capitalized (3,983)
Foreign Currency [Member] | IDBs [Member]  
IfrsStatementLineItems [Line Items]  
Borrowings and financing, beginning 1,017,833
Additions
Funding 211,653
Borrowing costs (4,505)
Inflation adjustment and exchange rate changes (108,977)
Interest paid (53,406)
Amortization (85,657)
Accrued interest 47,168
Provision for interest and charges -capitalized 3,762
Expenses with borrowing costs 1,296
Fair Value 14,021
Borrowings and financing, ending 1,037,182
Inflation adjustment/Exchange rate change - Capitalized (6,006)
Foreign Currency [Member] | I B R D [Member]  
IfrsStatementLineItems [Line Items]  
Borrowings and financing, beginning 846,017
Additions
Funding 437,507
Borrowing costs (2,346)
Inflation adjustment and exchange rate changes (90,173)
Interest paid (46,133)
Amortization (34,034)
Accrued interest 45,786
Provision for interest and charges -capitalized 861
Expenses with borrowing costs 701
Fair Value 3,308
Borrowings and financing, ending 1,160,707
Inflation adjustment/Exchange rate change - Capitalized (787)
Foreign Currency [Member] | J I C A [Member]  
IfrsStatementLineItems [Line Items]  
Borrowings and financing, beginning 1,492,515
Additions
Funding 1,030,950
Borrowing costs (10,426)
Inflation adjustment and exchange rate changes (128,344)
Interest paid (21,509)
Amortization (159,889)
Accrued interest 20,954
Provision for interest and charges -capitalized 697
Expenses with borrowing costs 374
Fair Value (101,669)
Borrowings and financing, ending 2,125,285
Inflation adjustment/Exchange rate change - Capitalized 1,632
Foreign Currency [Member] | IFCs [Member]  
IfrsStatementLineItems [Line Items]  
Borrowings and financing, beginning
Additions
Funding 3,372,828
Borrowing costs (35,733)
Inflation adjustment and exchange rate changes (24,945)
Interest paid (68,949)
Amortization
Accrued interest 102,377
Provision for interest and charges -capitalized 1,580
Expenses with borrowing costs 2,133
Fair Value 64,968
Borrowings and financing, ending 3,415,437
Inflation adjustment/Exchange rate change - Capitalized 1,178
Foreign Currency [Member] | Blue Bonds [Member]  
IfrsStatementLineItems [Line Items]  
Borrowings and financing, beginning
Additions
Funding 2,659,300
Borrowing costs (19,679)
Inflation adjustment and exchange rate changes 93,245
Interest paid
Amortization
Accrued interest 63,610
Provision for interest and charges -capitalized
Expenses with borrowing costs 1,656
Fair Value 95,509
Borrowings and financing, ending 2,893,641
Inflation adjustment/Exchange rate change - Capitalized