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Consolidated Statements of Cash Flows - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Cash flow from operating activities      
    Profit before income tax and social contribution R$ 13,642,808 R$ 4,753,984 R$ 4,272,750
 Adjustments for:      
    Depreciation and amortization 2,676,642 2,790,586 2,450,849
    Residual value of property, plant and equipment, intangible assets, contract assets and investment properties written-off 171,173 8,354 10,110
    Bad debt expense 557,789 652,920 782,057
    Provisions and inflation adjustment of provisions 801,179 458,889 630,689
    Interest calculated on borrowings and financing payable 1,655,765 1,314,359 1,091,592
    Inflation adjustment and exchange (losses) gains on borrowings and financing 659,475 (163,322) (301,716)
    Market value adjustment of financings (fair value hedge) 34,388
    Interest and inflation adjustments, net (237,617) (79,232) (377,832)
    Finance charges from customers (437,811) (374,902) (328,486)
    Construction margin on intangible assets arising from concession agreements (139,976) (125,603) (109,369)
   Provision for Consent Decree (TAC), Knowledge Retention Program (PRC), Incentivized Dismissal Program (PDI), and Voluntary Dismissal Program (PDV) 354,078 356,300 (1,238)
    Equity accounting (35,322) (32,393) (24,551)
    Interest and monetary adjustments on PPP 589,330 1,001,078 489,197
    Transfer to the São Paulo Municipal Government 309,807 195,874 167,714
    Pension plan obligations 161,505 238,751 183,262
    Adjustment for the reclassification of derivative financial instruments (324,778)
    Financial asset adjustment (indemnities) (9,151,310)
    Deferred PIS/Cofins on financial assets (indemnity) 822,482
    Other adjustments 108,901 21,997 15,488
Total Adjustments  12,218,508 11,017,640 8,950,516
Changes in assets      
   Trade receivables (442,312) (835,324) (489,885)
   Accounts receivable from related parties (25,429) (4,553) (295,091)
   Inventories (13,785) 38,239 (10,741)
   Recoverable taxes (306,163) (251,741) 33,198
   Escrow deposits 50,547 72,469 5,348
   Other assets (2,668) 36,091 18,264
Changes in liabilities      
   Trade payables and contractors (437,694) (394,188) (220,462)
   Services payable 377,968 (168,384) 86,501
   Accrued payroll and related taxes 77,973 19,377 73,126
   Taxes and contributions payable 265,189 186,810 120,853
   Deferred PIS/Cofins 131,225 4,374 267
   Provisions (185,932) (243,241) (468,398)
   Pension plan obligations (227,233) (249,488) (239,174)
   Other liabilities (335,726) (868,699) (722,549)
Cash generated from operations 11,144,468 8,359,382 6,841,773
   Interest paid (1,976,694) (1,936,419) (1,505,488)
   Income tax and social contribution paid (1,763,206) (1,568,611) (1,368,686)
Net cash generated from operating activities 7,404,568 4,854,352 3,967,599
Cash flows from investing activities      
   Acquisition of contract assets and intangible assets (7,929,946) (3,991,325) (3,550,537)
   Restricted cash 17,229 (17,470) (9,007)
   Financial invesments – investment (6,456,564) (1,559,808) (426,171)
   Financial invesments – redemption 5,303,658 816,965 1,181,683
   Financial invesments – non-current (769,057)
 Additions to investments (40,234) (6,625) (648)
   Purchase of property, plant and equipment (100,728) (147,249) (73,668)
Net cash used in investing activities (9,975,642) (4,905,512) (2,878,348)
Cash flows from financing activities      
   Borrowings and financing    
       Funding 6,870,754 2,371,111 2,807,026
       Amortization payment (2,246,263) (1,771,090) (1,536,724)
  Payment of interest on capital (928,851) (823,671) (603,541)
  Public-Private Partnership - PPP (569,725) (673,645) (590,201)
Program Contract Commitments (35,497) (81,357) (16,255)
Derivative financial instruments received 324,778
  Capital increase 811
Net cash generated by (used in) financing activities 3,415,196 (977,841) 60,305
Increase / (decrease) in cash and cash equivalents 844,122 (1,029,001) 1,149,556
Represented by:      
Cash and cash equivalents at the beginning of the year 838,484 1,867,485 717,929
Cash and cash equivalents at the end of the year R$ 1,682,606 R$ 838,484 R$ 1,867,485