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Statements of Cash Flows - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cash flow from operating activities      
Profit before income tax and social contribution R$ 3,912,319 R$ 3,503,614 R$ 4,129,054
Adjustments for:      
Depreciation and amortization 1,392,541 1,301,897 1,146,626
Residual value of property, plant and equipment, intangible assets and investment properties written-off 24,974 24,935 15,168
Bad debt expense, net of recoveries 166,727 82,681 90,488
Agreement signed with the municipality of Guarulhos (928,014) 0 0
Provisions and inflation adjustment 111,940 185,080 276,654
Pension plan liabilities - early reduction (curtailment) 0 0 (334,152)
Interest calculated on borrowings and financing payable 563,902 426,781 449,470
Inflation adjustment and exchange gains (losses) on borrowings and financing 982,072 159,087 (969,430)
Interest and inflation adjustment on liabilities 30,103 25,751 24,297
Interest and inflation adjustment on assets (64,046) (31,619) (80,675)
Finance charges from customers (289,321) (193,683) (207,789)
Margin of fair value on intangible assets arising from concession (63,013) (70,335) (81,513)
Provision for Consent Decree (TAC) 80,245 72,933 89,083
Share of profit of investees (6,510) (5,760) (4,740)
Provision from São Paulo agreement 135,735 0 0
Provision for pension plan - Sabesprev Mais 0 0 235
Pension obligations 243,569 304,500 377,886
Other adjustments 33,349 92,461 24,412
Total adustments 6,325,278 5,878,323 4,945,074
Changes in assets      
Trade receivables (71,679) (42,194) (34,665)
Accounts receivable from related parties 39,919 51,594 (3,163)
Inventories 20,075 (27,633) 7,156
Recoverable taxes (104,118) (233,952) 35,195
Escrow deposits (1,639) (32,200) 33,232
Other receivables 11,760 8,312 144,920
Changes in liabilities      
Trade payables and contractors (176,826) (180,353) 6,371
Services payable (89,988) (51,779) 72,775
Accrued payroll and related taxes (103,488) 56,841 21,240
Taxes and contributions payable (4,829) 15,983 (90,325)
Deferred Cofins/PASEP 10,648 (7,889) 5,150
Provisions (297,282) (279,951) (185,793)
Pension obligations (217,000) (228,282) (201,736)
Other liabilities 122,214 (16,741) 17,842
Cash generated from operations 5,463,045 4,910,079 4,773,273
Interest paid (732,048) (676,087) (739,944)
Income tax and social contribution paid (888,077) (932,110) (1,029,737)
Net cash generated from operating activities 3,842,920 3,301,882 3,003,592
Cash flows from investing activities      
Acquisition of contract asset and intangible (2,132,559) (1,957,780) (2,108,167)
Restricted cash (13,078) 5,256 5,078
Investment increase (1,136) 0 0
Purchase of property, plant and equipment (50,645) (18,920) (27,631)
Dividends received 8,131 0 0
Net cash used in investing activities (2,189,287) (1,971,444) (2,130,720)
Borrowings and financing      
Proceeds from loans 1,634,553 1,007,572 1,250,524
Payment of loans (1,678,748) (1,098,558) (1,535,312)
Payment of interest on capital (653,393) (765,933) (139,399)
Public-Private Partnership - PPP (178,333) (31,758) (30,498)
Program Contract Commitments (31,568) (44,935) (171,180)
Net cash used in financing activities (907,489) (933,612) (625,865)
Increase in cash and cash equivalents 746,144 396,826 247,007
Represented by :      
Cash and cash equivalents at the beginning of the year 2,283,047 1,886,221 1,639,214
Cash and cash equivalents at the end of the year 3,029,191 2,283,047 1,886,221
Increase in cash and cash equivalents R$ 746,144 R$ 396,826 R$ 247,007