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Unaudited Condensed Consolidated Interim Statements of Cash Flows - BRL (R$)
R$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Cash flow from operating activities    
    Profit before income tax and social contribution R$ 1,323,860 R$ 1,132,945
 Adjustments for:    
    Depreciation and amortization 773,785 657,145
    Residual value of property, plant and equipment, intangible assets and investment properties written-off 918 3,515
    Allowance for doubtful accounts 190,518 162,805
    Provisions and inflation adjustment of provisions 83,945 70,031
    Interest calculated on borrowings and financing payable 344,775 316,805
    Inflation adjustment and exchange (losses) gains on borrowings and financing 47,701 (13,316)
    Interest and inflation adjustments on liabilities 5,271 6,915
    Interest and inflation adjustments on assets (60,490) (28,976)
    Finance charges from customers (109,237) (95,653)
    Construction margin on intangible assets arising from concession agreements (30,055) (26,519)
    Provision for Consent Decree (TAC) and Knowledge Retention Program (PRC) (107,796) (345)
    Equity results of investments in affiliaties (8,893) (6,334)
    Interest and monetary adjustments on PPP 145,823 123,045
    Transfer to the São Paulo Municipal Government 174,673 155,387
    Pension plan obligations 48,879 51,921
    Other adjustments 4,346 4,119
Total Adjustments 2,828,023 2,513,490
Changes in assets    
   Trade receivables (154,632) (183,680)
   Accounts receivable from related parties 6,553 10,172
   Inventories (36,158) 6,951
   Recoverable taxes 166,474 (23,531)
   Escrow deposits 12,497 (742)
   Other assets (41,024) (33,323)
Changes in liabilities    
   Trade payables and contractors (419,392) (414,033)
   Services payable (86,703) (274,097)
   Accrued payroll and related taxes 33,630 (2,630)
   Taxes and contributions payable (85,314) (225,360)
   Deferred Cofins and Pasep 5,168 1,591
   Provisions (47,176) (31,604)
   Pension plan obligations (60,520) (58,324)
   Other liabilities 74,993 (232,389)
Cash generated from operations (631,604) (1,460,999)
   Interest paid (473,596) (543,850)
   Income tax and social contribution paid (325,403) (113,335)
  Net cash generated from operating activities 1,397,420 395,306
Cash flows from investing activities    
   Acquisition of contract assets and intangible assets (571,410) (570,332)
   Restricted cash 9,250 (10,827)
 Financial investments (1,706,738) 28,560
   Purchase of property, plant and equipment (15,911) (30,954)
Net cash used in investing activities (2,284,809) (583,553)
Cash flows from financing activities    
   Proceeds from loans 2,939,695 121,611
   Payment of loans (660,026) (716,239)
   Public-Private Partnership - PPP (209,734) (208,764)
 Program Contract Commitments (1,639) (39,396)
Net cash generated by (used in) financing activities 2,068,296 (842,788)
Increase / (decrease) in cash and cash equivalents 1,180,907 (1,031,035)
Represented by:    
Cash and cash equivalents at the beginning of the period 838,484 1,867,485
Cash and cash equivalents at the end of the period 2,019,391 836,450
Increase / (decrease) in cash and cash equivalents R$ 1,180,907 R$ (1,031,035)